/* Riot Compiler WIP, @license MIT */
import { types as types$1, print, parse } from 'recast';
import { composeSourceMaps } from 'recast/lib/util';
import { SourceMapGenerator } from 'source-map';
import compose from 'cumpa';
import cssEscape from 'cssesc';
import curry from 'curri';
import { Parser } from 'acorn';
import globalScope from 'globals';
import riotParser, { nodeTypes } from '@riotjs/parser';
import { hasValueAttribute } from 'dom-nodes';

const TAG_LOGIC_PROPERTY = 'exports';
const TAG_CSS_PROPERTY = 'css';
const TAG_TEMPLATE_PROPERTY = 'template';
const TAG_NAME_PROPERTY = 'name';

const types = types$1;
const builders = types$1.builders;
const namedTypes = types$1.namedTypes;

function nullNode() {
  return builders.literal(null)
}

function simplePropertyNode(key, value) {
  return builders.property('init', builders.literal(key), value, false)
}

/**
 * Return a source map as JSON, it it has not the toJSON method it means it can
 * be used right the way
 * @param   { SourceMapGenerator|Object } map - a sourcemap generator or simply an json object
 * @returns { Object } the source map as JSON
 */
function sourcemapAsJSON(map) {
  if (map && map.toJSON) return map.toJSON()
  return map
}

/**
 * Detect node js environements
 * @returns { boolean } true if the runtime is node
 */
function isNode() {
  return typeof process !== 'undefined'
}

/**
 * Compose two sourcemaps
 * @param   { SourceMapGenerator } formerMap - original sourcemap
 * @param   { SourceMapGenerator } latterMap - target sourcemap
 * @returns { Object } sourcemap json
 */
function composeSourcemaps(formerMap, latterMap) {
  if (
    isNode() &&
    formerMap && latterMap && latterMap.mappings
  ) {
    return composeSourceMaps(sourcemapAsJSON(formerMap), sourcemapAsJSON(latterMap))
  } else if (isNode() && formerMap) {
    return sourcemapAsJSON(formerMap)
  }

  return {}
}

/**
 * Create a new sourcemap generator
 * @param   { Object } options - sourcemap options
 * @returns { SourceMapGenerator } SourceMapGenerator instance
 */
function createSourcemap(options) {
  return new SourceMapGenerator(options)
}

const Output = Object.freeze({
  code: '',
  ast: [],
  meta: {},
  map: null
});

/**
 * Create the right output data result of a parsing
 * @param   { Object } data - output data
 * @param   { string } data.code - code generated
 * @param   { AST } data.ast - ast representing the code
 * @param   { SourceMapGenerator } data.map - source map generated along with the code
 * @param   { Object } meta - compilation meta infomration
 * @returns { Output } output container object
 */
function createOutput(data, meta) {
  const output = {
    ...Output,
    ...data,
    meta
  };

  if (!output.map && meta && meta.options && meta.options.file)
    return {
      ...output,
      map: createSourcemap({ file: meta.options.file })
    }

  return output
}

/**
 * Transform the source code received via a compiler function
 * @param   { Function } compiler - function needed to generate the output code
 * @param   { Object } meta - compilation meta information
 * @param   { string } source - source code
 * @returns { Output } output - the result of the compiler
 */
function transform(compiler, meta, source) {
  const result = (compiler ? compiler(source, meta) : { code: source });
  return createOutput(result, meta)
}

/**
 * Throw an error with a descriptive message
 * @param   { string } message - error message
 * @returns { undefined } hoppla.. at this point the program should stop working
 */
function panic(message) {
  throw new Error(message)
}

const postprocessors = new Set();

/**
 * Register a postprocessor that will be used after the parsing and compilation of the riot tags
 * @param { Function } postprocessor - transformer that will receive the output code ans sourcemap
 * @returns { Set } the postprocessors collection
 */
function register(postprocessor) {
  if (postprocessors.has(postprocessor)) {
    panic(`This postprocessor "${postprocessor.name || postprocessor.toString()}" was already registered`);
  }

  postprocessors.add(postprocessor);

  return postprocessors
}

/**
 * Exec all the postprocessors in sequence combining the sourcemaps generated
 * @param   { Output } compilerOutput - output generated by the compiler
 * @param   { Object } meta - compiling meta information
 * @returns { Output } object containing output code and source map
 */
function execute(compilerOutput, meta) {
  return Array.from(postprocessors).reduce(function(acc, postprocessor) {
    const { code, map } = acc;
    const output = postprocessor(code, meta);

    return {
      code: output.code,
      map: composeSourcemaps(map, output.map)
    }
  }, createOutput(compilerOutput, meta))
}

/**
 * Parsers that can be registered by users to preparse components fragments
 * @type { Object }
 */
const preprocessors = Object.freeze({
  javascript: new Map(),
  css: new Map(),
  template: new Map().set('default', code => ({ code }))
});

// throw a processor type error
function preprocessorTypeError(type) {
  panic(`No preprocessor of type "${type}" was found, please make sure to use one of these: 'javascript', 'css' or 'template'`);
}

// throw an error if the preprocessor was not registered
function preprocessorNameNotFoundError(name) {
  panic(`No preprocessor named "${name}" was found, are you sure you have registered it?'`);
}

/**
 * Register a custom preprocessor
 * @param   { string } type - preprocessor type either 'js', 'css' or 'template'
 * @param   { string } name - unique preprocessor id
 * @param   { Function } preprocessor - preprocessor function
 * @returns { Map } - the preprocessors map
 */
function register$1(type, name, preprocessor) {
  if (!type) panic('Please define the type of preprocessor you want to register \'javascript\', \'css\' or \'template\'');
  if (!name) panic('Please define a name for your preprocessor');
  if (!preprocessor) panic('Please provide a preprocessor function');
  if (!preprocessors[type]) preprocessorTypeError(type);
  if (preprocessors[type].has(name)) panic(`The preprocessor ${name} was already registered before`);

  preprocessors[type].set(name, preprocessor);

  return preprocessors
}

/**
 * Exec the compilation of a preprocessor
 * @param   { string } type - preprocessor type either 'js', 'css' or 'template'
 * @param   { string } name - unique preprocessor id
 * @param   { Object } meta - preprocessor meta information
 * @param   { string } source - source code
 * @returns { Output } object containing a sourcemap and a code string
 */
function execute$1(type, name, meta, source) {
  if (!preprocessors[type]) preprocessorTypeError(type);
  if (!preprocessors[type].has(name)) preprocessorNameNotFoundError(name);

  return transform(preprocessors[type].get(name), meta, source)
}

const ATTRIBUTE_TYPE_NAME = 'type';

/**
 * Get the type attribute from a node generated by the riot parser
 * @param   { Object} sourceNode - riot parser node
 * @returns { string|null } a valid type to identify the preprocessor to use or nothing
 */
function getPreprocessorTypeByAttribute(sourceNode) {
  const typeAttribute = sourceNode.attributes ?
    sourceNode.attributes.find(attribute => attribute.name === ATTRIBUTE_TYPE_NAME) :
    null;

  return typeAttribute ? normalize(typeAttribute.value) : null
}


/**
 * Remove the noise in case a user has defined the preprocessor type='text/scss'
 * @param   { string } value - input string
 * @returns { string } normalized string
 */
function normalize(value) {
  return value.replace('text/', '')
}

/**
 * Preprocess a riot parser node
 * @param   { string } preprocessorType - either css, js
 * @param   { string } preprocessorName - preprocessor id
 * @param   { Object } meta - compilation meta information
 * @param   { RiotParser.nodeTypes } node - css node detected by the parser
 * @returns { Output } code and sourcemap generated by the preprocessor
 */
function preprocess(preprocessorType, preprocessorName, meta, node) {
  const code = node.text;

  return (preprocessorName ?
    execute$1(preprocessorType, preprocessorName, meta, code) :
    { code }
  )
}

/**
 * Matches valid, multiline JavaScript comments in almost all its forms.
 * @const {RegExp}
 * @static
 */
const R_MLCOMMS = /\/\*[^*]*\*+(?:[^*/][^*]*\*+)*\//g;

/**
 * Source for creating regexes matching valid quoted, single-line JavaScript strings.
 * It recognizes escape characters, including nested quotes and line continuation.
 * @const {string}
 */
const S_LINESTR = /"[^"\n\\]*(?:\\[\S\s][^"\n\\]*)*"|'[^'\n\\]*(?:\\[\S\s][^'\n\\]*)*'/.source;

/**
 * Matches CSS selectors, excluding those beginning with '@' and quoted strings.
 * @const {RegExp}
 */

const CSS_SELECTOR = RegExp(`([{}]|^)[; ]*((?:[^@ ;{}][^{}]*)?[^@ ;{}:] ?)(?={)|${S_LINESTR}`, 'g');

/**
 * Parses styles enclosed in a "scoped" tag
 * The "css" string is received without comments or surrounding spaces.
 *
 * @param   {string} tag - Tag name of the root element
 * @param   {string} css - The CSS code
 * @returns {string} CSS with the styles scoped to the root element
 */
function scopedCSS(tag, css) {
  const host = ':host';
  const selectorsBlacklist = ['from', 'to'];

  return css.replace(CSS_SELECTOR, function(m, p1, p2) {
    // skip quoted strings
    if (!p2) return m

    // we have a selector list, parse each individually
    p2 = p2.replace(/[^,]+/g, function(sel) {
      const s = sel.trim();

      // skip selectors already using the tag name
      if (s.indexOf(tag) === 0) {
        return sel
      }

      // skips the keywords and percents of css animations
      if (!s || selectorsBlacklist.indexOf(s) > -1 || s.slice(-1) === '%') {
        return sel
      }

      // replace the `:host` pseudo-selector, where it is, with the root tag name;
      // if `:host` was not included, add the tag name as prefix, and mirror all
      // `[data-is]`
      if (s.indexOf(host) < 0) {
        return `${tag} ${s},[is="${tag}"] ${s}`
      } else {
        return `${s.replace(host, tag)},${
          s.replace(host, `[is="${tag}"]`)}`
      }
    });

    // add the danling bracket char and return the processed selector list
    return p1 ? `${p1} ${p2}` : p2
  })
}

/**
 * Remove comments, compact and trim whitespace
 * @param { string } code - compiled css code
 * @returns { string } css code normalized
 */
function compactCss(code) {
  return code.replace(R_MLCOMMS, '').replace(/\s+/g, ' ').trim()
}

const escapeBackslashes = s => s.replace(/\\/g, '\\\\');
const escapeIdentifier = identifier => escapeBackslashes(cssEscape(identifier, {
  isIdentifier: true
}));

/**
 * Generate the component css
 * @param   { Object } sourceNode - node generated by the riot compiler
 * @param   { string } source - original component source code
 * @param   { Object } meta - compilation meta information
 * @param   { AST } ast - current AST output
 * @returns { AST } the AST generated
 */
function css(sourceNode, source, meta, ast) {
  const preprocessorName = getPreprocessorTypeByAttribute(sourceNode);
  const { options } = meta;
  const preprocessorOutput = preprocess('css', preprocessorName, meta, sourceNode.text);
  const normalizedCssCode = compactCss(preprocessorOutput.code);
  const escapedCssIdentifier = escapeIdentifier(meta.tagName);

  const cssCode = (options.scopedCss ?
    scopedCSS(escapedCssIdentifier, escapeBackslashes(normalizedCssCode)) :
    escapeBackslashes(normalizedCssCode)
  ).trim();

  types.visit(ast, {
    visitProperty(path) {
      if (path.value.key.value === TAG_CSS_PROPERTY) {
        path.value.value = builders.templateLiteral(
          [builders.templateElement({ raw: cssCode, cooked: '' }, false)],
          []
        );

        return false
      }

      this.traverse(path);
    }
  });

  return ast
}

/**
 * Generate the javascript from an ast source
 * @param   {AST} ast - ast object
 * @param   {Object} options - printer options
 * @returns {Object} code + map
 */
function generateJavascript(ast, options) {
  return print(ast, {
    ...options,
    tabWidth: 2,
    quote: 'single'
  })
}

/**
 * True if the sourcemap has no mappings, it is empty
 * @param   {Object}  map - sourcemap json
 * @returns {boolean} true if empty
 */
function isEmptySourcemap(map) {
  return !map || !map.mappings || !map.mappings.length
}

const LINES_RE = /\r\n?|\n/g;

/**
 * Split a string into a rows array generated from its EOL matches
 * @param   { string } string [description]
 * @returns { Array } array containing all the string rows
 */
function splitStringByEOL(string) {
  return string.split(LINES_RE)
}

/**
 * Get the line and the column of a source text based on its position in the string
 * @param   { string } string - target string
 * @param   { number } position - target position
 * @returns { Object } object containing the source text line and column
 */
function getLineAndColumnByPosition(string, position) {
  const lines = splitStringByEOL(string.slice(0, position));

  return {
    line: lines.length,
    column: lines[lines.length - 1].length
  }
}

/**
 * Add the offset to the code that must be parsed in order to generate properly the sourcemaps
 * @param {string} input - input string
 * @param {string} source - original source code
 * @param {RiotParser.Node} node - node that we are going to transform
 * @return {string} the input string with the offset properly set
 */
function addLineOffset(input, source, node) {
  const {column, line} = getLineAndColumnByPosition(source, node.start);
  return `${'\n'.repeat(line - 1)}${' '.repeat(column + 1)}${input}`
}

/**
 * Parse a js source to generate the AST
 * @param   {string} source - javascript source
 * @param   {Object} options - parser options
 * @returns {AST} AST tree
 */
function generateAST(source, options) {
  return parse(source, {
    parser: {
      parse(source, opts) {
        return Parser.parse(source, {
          ...opts,
          ecmaVersion: 2020
        })
      }
    },
    ...options
  })
}

const browserAPIs = Object.keys(globalScope.browser);
const builtinAPIs = Object.keys(globalScope.builtin);

const isIdentifier = namedTypes.Identifier.check.bind(namedTypes.Identifier);
const isLiteral = namedTypes.Literal.check.bind(namedTypes.Literal);
const isExpressionStatement = namedTypes.ExpressionStatement.check.bind(namedTypes.ExpressionStatement);
const isObjectExpression = namedTypes.ObjectExpression.check.bind(namedTypes.ObjectExpression);
const isThisExpression = namedTypes.ThisExpression.check.bind(namedTypes.ThisExpression);
const isNewExpression = namedTypes.NewExpression.check.bind(namedTypes.NewExpression);
const isSequenceExpression = namedTypes.SequenceExpression.check.bind(namedTypes.SequenceExpression);
const isBinaryExpression = namedTypes.BinaryExpression.check.bind(namedTypes.BinaryExpression);
const isExportDefaultStatement = namedTypes.ExportDefaultDeclaration.check.bind(namedTypes.ExportDefaultDeclaration);

const isBrowserAPI = ({name}) => browserAPIs.includes(name);
const isBuiltinAPI = ({name}) => builtinAPIs.includes(name);
const isRaw = (node) => node && node.raw; // eslint-disable-line

/**
 * Find the export default statement
 * @param   { Array } body - tree structure containing the program code
 * @returns { Object } node containing only the code of the export default statement
 */
function findExportDefaultStatement(body) {
  return body.find(isExportDefaultStatement)
}

/**
 * Find all the code in an ast program except for the export default statements
 * @param   { Array } body - tree structure containing the program code
 * @returns { Array } array containing all the program code except the export default expressions
 */
function filterNonExportDefaultStatements(body) {
  return body.filter(node => !isExportDefaultStatement(node))
}

/**
 * Get the body of the AST structure
 * @param   { Object } ast - ast object generated by recast
 * @returns { Array } array containing the program code
 */
function getProgramBody(ast) {
  return ast.body || ast.program.body
}

/**
 * Extend the AST adding the new tag method containing our tag sourcecode
 * @param   { Object } ast - current output ast
 * @param   { Object } exportDefaultNode - tag export default node
 * @returns { Object } the output ast having the "tag" key extended with the content of the export default
 */
function extendTagProperty(ast, exportDefaultNode) {
  types.visit(ast, {
    visitProperty(path) {
      if (path.value.key.value === TAG_LOGIC_PROPERTY) {
        path.value.value = exportDefaultNode.declaration;
        return false
      }

      this.traverse(path);
    }
  });

  return ast
}

/**
 * Generate the component javascript logic
 * @param   { Object } sourceNode - node generated by the riot compiler
 * @param   { string } source - original component source code
 * @param   { Object } meta - compilation meta information
 * @param   { AST } ast - current AST output
 * @returns { AST } the AST generated
 */
function javascript(sourceNode, source, meta, ast) {
  const preprocessorName = getPreprocessorTypeByAttribute(sourceNode);
  const javascriptNode = addLineOffset(sourceNode.text.text, source, sourceNode);
  const { options } = meta;
  const preprocessorOutput = preprocess('javascript', preprocessorName, meta, {
    ...sourceNode,
    text: javascriptNode
  });
  const inputSourceMap = sourcemapAsJSON(preprocessorOutput.map);
  const generatedAst = generateAST(preprocessorOutput.code, {
    sourceFileName: options.file,
    inputSourceMap: isEmptySourcemap(inputSourceMap) ? null : inputSourceMap
  });
  const generatedAstBody = getProgramBody(generatedAst);
  const bodyWithoutExportDefault = filterNonExportDefaultStatements(generatedAstBody);
  const exportDefaultNode = findExportDefaultStatement(generatedAstBody);
  const outputBody = getProgramBody(ast);

  // add to the ast the "private" javascript content of our tag script node
  outputBody.unshift(...bodyWithoutExportDefault);

  // convert the export default adding its content to the "tag" property exported
  if (exportDefaultNode) extendTagProperty(ast, exportDefaultNode);

  return ast
}

// import {IS_BOOLEAN,IS_CUSTOM,IS_RAW,IS_SPREAD,IS_VOID} from '@riotjs/parser/src/constants'

const BINDING_TYPES = 'bindingTypes';
const EACH_BINDING_TYPE = 'EACH';
const IF_BINDING_TYPE = 'IF';
const TAG_BINDING_TYPE = 'TAG';
const SLOT_BINDING_TYPE = 'SLOT';


const EXPRESSION_TYPES = 'expressionTypes';
const ATTRIBUTE_EXPRESSION_TYPE = 'ATTRIBUTE';
const VALUE_EXPRESSION_TYPE = 'VALUE';
const TEXT_EXPRESSION_TYPE = 'TEXT';
const EVENT_EXPRESSION_TYPE = 'EVENT';

const TEMPLATE_FN = 'template';
const SCOPE = 'scope';
const GET_COMPONENT_FN = 'getComponent';

// keys needed to create the DOM bindings
const BINDING_SELECTOR_KEY = 'selector';
const BINDING_GET_COMPONENT_KEY = 'getComponent';
const BINDING_TEMPLATE_KEY = 'template';
const BINDING_TYPE_KEY = 'type';
const BINDING_REDUNDANT_ATTRIBUTE_KEY = 'redundantAttribute';
const BINDING_CONDITION_KEY = 'condition';
const BINDING_ITEM_NAME_KEY = 'itemName';
const BINDING_GET_KEY_KEY = 'getKey';
const BINDING_INDEX_NAME_KEY = 'indexName';
const BINDING_EVALUATE_KEY = 'evaluate';
const BINDING_NAME_KEY = 'name';
const BINDING_SLOTS_KEY = 'slots';
const BINDING_EXPRESSIONS_KEY = 'expressions';
const BINDING_CHILD_NODE_INDEX_KEY = 'childNodeIndex';
// slots keys
const BINDING_BINDINGS_KEY = 'bindings';
const BINDING_ID_KEY = 'id';
const BINDING_HTML_KEY = 'html';
const BINDING_ATTRIBUTES_KEY = 'attributes';

// DOM directives
const IF_DIRECTIVE = 'if';
const EACH_DIRECTIVE = 'each';
const KEY_ATTRIBUTE = 'key';
const SLOT_ATTRIBUTE = 'slot';
const NAME_ATTRIBUTE = 'name';
const IS_DIRECTIVE = 'is';

// Misc
const DEFAULT_SLOT_NAME = 'default';
const TEXT_NODE_EXPRESSION_PLACEHOLDER = '<!---->';
const BINDING_SELECTOR_PREFIX = 'expr';
const SLOT_TAG_NODE_NAME = 'slot';
const PROGRESS_TAG_NODE_NAME = 'progress';
const IS_VOID_NODE = 'isVoid';
const IS_CUSTOM_NODE = 'isCustom';
const IS_BOOLEAN_ATTRIBUTE = 'isBoolean';
const IS_SPREAD_ATTRIBUTE = 'isSpread';

/**
 * True if the node has not expression set nor bindings directives
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {boolean} true only if it's a static node that doesn't need bindings or expressions
 */
function isStaticNode(node) {
  return [
    hasExpressions,
    findEachAttribute,
    findIfAttribute,
    isCustomNode,
    isSlotNode
  ].every(test => !test(node))
}

/**
 * Check if a node name is part of the browser or builtin javascript api or it belongs to the current scope
 * @param   { types.NodePath } path - containing the current node visited
 * @returns {boolean} true if it's a global api variable
 */
function isGlobal({ scope, node }) {
  return Boolean(
    isRaw(node) ||
        isBuiltinAPI(node) ||
        isBrowserAPI(node) ||
        isNewExpression(node) ||
        isNodeInScope(scope, node),
  )
}

/**
 * Checks if the identifier of a given node exists in a scope
 * @param {Scope} scope - scope where to search for the identifier
 * @param {types.Node} node - node to search for the identifier
 * @returns {boolean} true if the node identifier is defined in the given scope
 */
function isNodeInScope(scope, node) {
  const traverse = (isInScope = false) => {
    types.visit(node, {
      visitIdentifier(path) {
        if (scope.lookup(getName(path.node))) {
          isInScope = true;
        }

        this.abort();
      }
    });

    return isInScope
  };

  return traverse()
}

/**
 * True if the node has the isCustom attribute set
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {boolean} true if either it's a riot component or a custom element
 */
function isCustomNode(node) {
  return !!(node[IS_CUSTOM_NODE] || hasIsAttribute(node))
}

/**
 * True the node is <slot>
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {boolean} true if it's a slot node
 */
function isSlotNode(node) {
  return node.name === SLOT_TAG_NODE_NAME
}

/**
 * True if the node has the isVoid attribute set
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {boolean} true if the node is self closing
 */
function isVoidNode(node) {
  return !!node[IS_VOID_NODE]
}

/**
 * True if the riot parser did find a tag node
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {boolean} true only for the tag nodes
 */
function isTagNode(node) {
  return node.type === nodeTypes.TAG
}

/**
 * True if the riot parser did find a text node
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {boolean} true only for the text nodes
 */
function isTextNode(node) {
  return node.type === nodeTypes.TEXT
}

/**
 * True if the node parsed is the root one
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {boolean} true only for the root nodes
 */
function isRootNode(node) {
  return node.isRoot
}

/**
 * True if the attribute parsed is of type spread one
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {boolean} true if the attribute node is of type spread
 */
function isSpreadAttribute(node) {
  return node[IS_SPREAD_ATTRIBUTE]
}

/**
 * True if the node is an attribute and its name is "value"
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {boolean} true only for value attribute nodes
 */
function isValueAttribute(node) {
  return node.name === 'value'
}

/**
 * True if the DOM node is a progress tag
 * @param   {RiotParser.Node}  node - riot parser node
 * @returns {boolean} true for the progress tags
 */
function isProgressNode(node) {
  return node.name === PROGRESS_TAG_NODE_NAME
}

/**
 * True if the node is an attribute and a DOM handler
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {boolean} true only for dom listener attribute nodes
 */
const isEventAttribute = (() => {
  const EVENT_ATTR_RE = /^on/;
  return node => EVENT_ATTR_RE.test(node.name)
})();

/**
 * True if the node has expressions or expression attributes
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {boolean} ditto
 */
function hasExpressions(node) {
  return !!(
    node.expressions ||
        // has expression attributes
        (getNodeAttributes(node).some(attribute => hasExpressions(attribute))) ||
        // has child text nodes with expressions
        (node.nodes && node.nodes.some(node => isTextNode(node) && hasExpressions(node)))
  )
}

/**
 * True if the node is a directive having its own template
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {boolean} true only for the IF EACH and TAG bindings
 */
function hasItsOwnTemplate(node) {
  return [
    findEachAttribute,
    findIfAttribute,
    isCustomNode
  ].some(test => test(node))
}

const hasIfAttribute = compose(Boolean, findIfAttribute);
const hasEachAttribute = compose(Boolean, findEachAttribute);
const hasIsAttribute = compose(Boolean, findIsAttribute);
const hasKeyAttribute = compose(Boolean, findKeyAttribute);

/**
 * Find the attribute node
 * @param   { string } name -  name of the attribute we want to find
 * @param   { riotParser.nodeTypes.TAG } node - a tag node
 * @returns { riotParser.nodeTypes.ATTR } attribute node
 */
function findAttribute(name, node) {
  return node.attributes && node.attributes.find(attr => getName(attr) === name)
}

function findIfAttribute(node) {
  return findAttribute(IF_DIRECTIVE, node)
}

function findEachAttribute(node) {
  return findAttribute(EACH_DIRECTIVE, node)
}

function findKeyAttribute(node) {
  return findAttribute(KEY_ATTRIBUTE, node)
}

function findIsAttribute(node) {
  return findAttribute(IS_DIRECTIVE, node)
}

/**
 * Find all the node attributes that are not expressions
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {Array} list of all the static attributes
 */
function findStaticAttributes(node) {
  return getNodeAttributes(node).filter(attribute => !hasExpressions(attribute))
}

/**
 * Find all the node attributes that have expressions
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {Array} list of all the dynamic attributes
 */
function findDynamicAttributes(node) {
  return getNodeAttributes(node).filter(hasExpressions)
}

/**
 * Unescape the user escaped chars
 * @param   {string} string - input string
 * @param   {string} char - probably a '{' or anything the user want's to escape
 * @returns {string} cleaned up string
 */
function unescapeChar(string, char) {
  return string.replace(RegExp(`\\\\${char}`, 'gm'), char)
}

const scope = builders.identifier(SCOPE);
const getName = node => node && node.name ? node.name : node;

/**
 * Replace the path scope with a member Expression
 * @param   { types.NodePath } path - containing the current node visited
 * @param   { types.Node } property - node we want to prefix with the scope identifier
 * @returns {undefined} this is a void function
 */
function replacePathScope(path, property) {
  path.replace(builders.memberExpression(
    scope,
    property,
    false
  ));
}

/**
 * Change the nodes scope adding the `scope` prefix
 * @param   { types.NodePath } path - containing the current node visited
 * @returns { boolean } return false if we want to stop the tree traversal
 * @context { types.visit }
 */
function updateNodeScope(path) {
  if (!isGlobal(path)) {
    replacePathScope(path, path.node);

    return false
  }

  this.traverse(path);
}

/**
 * Change the scope of the member expressions
 * @param   { types.NodePath } path - containing the current node visited
 * @returns { boolean } return always false because we want to check only the first node object
 */
function visitMemberExpression(path) {
  if (!isGlobal(path) && !isGlobal({ node: path.node.object, scope: path.scope })) {
    if (path.value.computed) {
      this.traverse(path);
    } else if (isBinaryExpression(path.node.object) || path.node.object.computed) {
      this.traverse(path.get('object'));
    } else if (!path.node.object.callee) {
      replacePathScope(path, isThisExpression(path.node.object) ? path.node.property : path.node);
    } else {
      this.traverse(path.get('object'));
    }
  }

  return false
}


/**
 * Objects properties should be handled a bit differently from the Identifier
 * @param   { types.NodePath } path - containing the current node visited
 * @returns { boolean } return false if we want to stop the tree traversal
 */
function visitProperty(path) {
  const value = path.node.value;

  if (isIdentifier(value)) {
    updateNodeScope(path.get('value'));
  } else {
    this.traverse(path.get('value'));
  }

  return false
}

/**
 * The this expressions should be replaced with the scope
 * @param   { types.NodePath } path - containing the current node visited
 * @returns { boolean|undefined } return false if we want to stop the tree traversal
 */
function visitThisExpression(path) {
  path.replace(scope);
  this.traverse(path);
}


/**
 * Update the scope of the global nodes
 * @param   { Object } ast - ast program
 * @returns { Object } the ast program with all the global nodes updated
 */
function updateNodesScope(ast) {
  const ignorePath = () => false;

  types.visit(ast, {
    visitIdentifier: updateNodeScope,
    visitMemberExpression,
    visitProperty,
    visitThisExpression,
    visitClassExpression: ignorePath
  });

  return ast
}

/**
 * Convert any expression to an AST tree
 * @param   { Object } expression - expression parsed by the riot parser
 * @param   { string } sourceFile - original tag file
 * @param   { string } sourceCode - original tag source code
 * @returns { Object } the ast generated
 */
function createASTFromExpression(expression, sourceFile, sourceCode) {
  const code = sourceFile ?
    addLineOffset(expression.text, sourceCode, expression) :
    expression.text;

  return generateAST(`(${code})`, {
    sourceFileName: sourceFile
  })
}

/**
 * Create the bindings template property
 * @param   {Array} args - arguments to pass to the template function
 * @returns {ASTNode} a binding template key
 */
function createTemplateProperty(args) {
  return simplePropertyNode(
    BINDING_TEMPLATE_KEY,
    args ? callTemplateFunction(...args) : nullNode()
  )
}

/**
 * Try to get the expression of an attribute node
 * @param   { RiotParser.Node.Attribute } attribute - riot parser attribute node
 * @returns { RiotParser.Node.Expression } attribute expression value
 */
function getAttributeExpression(attribute) {
  return attribute.expressions ? attribute.expressions[0] : {
    // if no expression was found try to typecast the attribute value
    ...attribute,
    text: attribute.value
  }
}

/**
 * Wrap the ast generated in a function call providing the scope argument
 * @param   {Object} ast - function body
 * @returns {FunctionExpresion} function having the scope argument injected
 */
function wrapASTInFunctionWithScope(ast) {
  return builders.functionExpression(
    null,
    [scope],
    builders.blockStatement([builders.returnStatement(
      ast
    )])
  )
}

/**
 * Convert any parser option to a valid template one
 * @param   { RiotParser.Node.Expression } expression - expression parsed by the riot parser
 * @param   { string } sourceFile - original tag file
 * @param   { string } sourceCode - original tag source code
 * @returns { Object } a FunctionExpression object
 *
 * @example
 *  toScopedFunction('foo + bar') // scope.foo + scope.bar
 *
 * @example
 *  toScopedFunction('foo.baz + bar') // scope.foo.baz + scope.bar
 */
function toScopedFunction(expression, sourceFile, sourceCode) {
  return compose(
    wrapASTInFunctionWithScope,
    transformExpression,
  )(expression, sourceFile, sourceCode)
}

/**
 * Transform an expression node updating its global scope
 * @param   {RiotParser.Node.Expr} expression - riot parser expression node
 * @param   {string} sourceFile - source file
 * @param   {string} sourceCode - source code
 * @returns {ASTExpression} ast expression generated from the riot parser expression node
 */
function transformExpression(expression, sourceFile, sourceCode) {
  return compose(
    getExpressionAST,
    updateNodesScope,
    createASTFromExpression
  )(expression, sourceFile, sourceCode)
}

/**
 * Get the parsed AST expression of riot expression node
 * @param   {AST.Program} sourceAST - raw node parsed
 * @returns {AST.Expression} program expression output
 */
function getExpressionAST(sourceAST) {
  const astBody = sourceAST.program.body;

  return astBody[0] ? astBody[0].expression : astBody
}

/**
 * Create the template call function
 * @param   {Array|string|Node.Literal} template - template string
 * @param   {Array<AST.Nodes>} bindings - template bindings provided as AST nodes
 * @returns {Node.CallExpression} template call expression
 */
function callTemplateFunction(template, bindings) {
  return builders.callExpression(builders.identifier(TEMPLATE_FN), [
    template ? builders.literal(template) : nullNode(),
    bindings ? builders.arrayExpression(bindings) : nullNode()
  ])
}

/**
 * Convert any DOM attribute into a valid DOM selector useful for the querySelector API
 * @param   { string } attributeName - name of the attribute to query
 * @returns { string } the attribute transformed to a query selector
 */
const attributeNameToDOMQuerySelector = attributeName => `[${attributeName}]`;

/**
 * Create the properties to query a DOM node
 * @param   { string } attributeName - attribute name needed to identify a DOM node
 * @returns { Array<AST.Node> } array containing the selector properties needed for the binding
 */
function createSelectorProperties(attributeName) {
  return attributeName ? [
    simplePropertyNode(BINDING_REDUNDANT_ATTRIBUTE_KEY, builders.literal(attributeName)),
    simplePropertyNode(BINDING_SELECTOR_KEY,
      compose(builders.literal, attributeNameToDOMQuerySelector)(attributeName)
    )
  ] : []
}

/**
 * Clone the node filtering out the selector attribute from the attributes list
 * @param   {RiotParser.Node} node - riot parser node
 * @param   {string} selectorAttribute - name of the selector attribute to filter out
 * @returns {RiotParser.Node} the node with the attribute cleaned up
 */
function cloneNodeWithoutSelectorAttribute(node, selectorAttribute) {
  return {
    ...node,
    attributes: getAttributesWithoutSelector(getNodeAttributes(node), selectorAttribute)
  }
}


/**
 * Get the node attributes without the selector one
 * @param   {Array<RiotParser.Attr>} attributes - attributes list
 * @param   {string} selectorAttribute - name of the selector attribute to filter out
 * @returns {Array<RiotParser.Attr>} filtered attributes
 */
function getAttributesWithoutSelector(attributes, selectorAttribute) {
  if (selectorAttribute)
    return attributes.filter(attribute => attribute.name !== selectorAttribute)

  return attributes
}

/**
 * Clean binding or custom attributes
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {Array<RiotParser.Node.Attr>} only the attributes that are not bindings or directives
 */
function cleanAttributes(node) {
  return getNodeAttributes(node).filter(attribute => ![
    IF_DIRECTIVE,
    EACH_DIRECTIVE,
    KEY_ATTRIBUTE,
    SLOT_ATTRIBUTE,
    IS_DIRECTIVE
  ].includes(attribute.name))
}

/**
 * Create a root node proxing only its nodes and attributes
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {RiotParser.Node} root node
 */
function createRootNode(node) {
  return {
    nodes: getChildrenNodes(node),
    isRoot: true,
    // root nodes shuold't have directives
    attributes: cleanAttributes(node)
  }
}

/**
 * Get all the child nodes of a RiotParser.Node
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {Array<RiotParser.Node>} all the child nodes found
 */
function getChildrenNodes(node) {
  return node && node.nodes ? node.nodes : []
}

/**
 * Get all the attributes of a riot parser node
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {Array<RiotParser.Node.Attribute>} all the attributes find
 */
function getNodeAttributes(node) {
  return node.attributes ? node.attributes : []
}
/**
 * Get the name of a custom node transforming it into an expression node
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {RiotParser.Node.Attr} the node name as expression attribute
 */
function getCustomNodeNameAsExpression(node) {
  const isAttribute = findIsAttribute(node);
  const toRawString = val => `'${val}'`;

  if (isAttribute) {
    return isAttribute.expressions ? isAttribute.expressions[0] : {
      ...isAttribute,
      text: toRawString(isAttribute.value)
    }
  }

  return { ...node, text: toRawString(getName(node)) }
}

/**
 * Convert all the node static attributes to strings
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {string} all the node static concatenated as string
 */
function staticAttributesToString(node) {
  return findStaticAttributes(node)
    .map(attribute => attribute[IS_BOOLEAN_ATTRIBUTE] || !attribute.value ?
      attribute.name :
      `${attribute.name}="${unescapeNode(attribute, 'value').value}"`
    ).join(' ')
}

/**
 * Make sure that node escaped chars will be unescaped
 * @param   {RiotParser.Node} node - riot parser node
 * @param   {string} key - key property to unescape
 * @returns {RiotParser.Node} node with the text property unescaped
 */
function unescapeNode(node, key) {
  if (node.unescape) {
    return {
      ...node,
      [key]: unescapeChar(node[key], node.unescape)
    }
  }

  return node
}


/**
 * Convert a riot parser opening node into a string
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {string} the node as string
 */
function nodeToString(node) {
  const attributes = staticAttributesToString(node);

  switch(true) {
  case isTagNode(node):
    return `<${node.name}${attributes ? ` ${attributes}` : ''}${isVoidNode(node) ? '/' : ''}>`
  case isTextNode(node):
    return hasExpressions(node) ? TEXT_NODE_EXPRESSION_PLACEHOLDER : unescapeNode(node, 'text').text
  default:
    return ''
  }
}

/**
 * Close an html node
 * @param   {RiotParser.Node} node - riot parser node
 * @returns {string} the closing tag of the html tag node passed to this function
 */
function closeTag(node) {
  return node.name ? `</${node.name}>` : ''
}

/**
 * Create a strings array with the `join` call to transform it into a string
 * @param   {Array} stringsArray - array containing all the strings to concatenate
 * @returns {AST.CallExpression} array with a `join` call
 */
function createArrayString(stringsArray) {
  return builders.callExpression(
    builders.memberExpression(
      builders.arrayExpression(stringsArray),
      builders.identifier('join'),
      false
    ),
    [builders.literal('')],
  )
}

/**
 * Simple expression bindings might contain multiple expressions like for example: "class="{foo} red {bar}""
 * This helper aims to merge them in a template literal if it's necessary
 * @param   {RiotParser.Attr} node - riot parser node
 * @param   {string} sourceFile - original tag file
 * @param   {string} sourceCode - original tag source code
 * @returns { Object } a template literal expression object
 */
function mergeAttributeExpressions(node, sourceFile, sourceCode) {
  if (!node.parts || node.parts.length === 1) {
    return transformExpression(node.expressions[0], sourceFile, sourceCode)
  }
  const stringsArray = [
    ...node.parts.reduce((acc, str) => {
      const expression = node.expressions.find(e => e.text.trim() === str);

      return [
        ...acc,
        expression ? transformExpression(expression, sourceFile, sourceCode) : builders.literal(str)
      ]
    }, [])
  ].filter(expr => !isLiteral(expr) || expr.value);


  return createArrayString(stringsArray)
}

/**
 * Create a selector that will be used to find the node via dom-bindings
 * @param   {number} id - temporary variable that will be increased anytime this function will be called
 * @returns {string} selector attribute needed to bind a riot expression
 */
const createBindingSelector = (function createSelector(id = 0) {
  return () => `${BINDING_SELECTOR_PREFIX}${id++}`
}());

/**
 * Create an attribute evaluation function
 * @param   {RiotParser.Attr} sourceNode - riot parser node
 * @param   {string} sourceFile - original tag file
 * @param   {string} sourceCode - original tag source code
 * @returns { AST.Node } an AST function expression to evaluate the attribute value
 */
function createAttributeEvaluationFunction(sourceNode, sourceFile, sourceCode) {
  return hasExpressions(sourceNode) ?
  // dynamic attribute
    wrapASTInFunctionWithScope(mergeAttributeExpressions(sourceNode, sourceFile, sourceCode)) :
  // static attribute
    builders.functionExpression(
      null,
      [],
      builders.blockStatement([
        builders.returnStatement(builders.literal(sourceNode.value || true))
      ]),
    )
}

/**
 * Simple clone deep function, do not use it for classes or recursive objects!
 * @param   {*} source - possibily an object to clone
 * @returns {*} the object we wanted to clone
 */
function cloneDeep(source) {
  return JSON.parse(JSON.stringify(source))
}

const getEachItemName = expression => isSequenceExpression(expression.left) ? expression.left.expressions[0] : expression.left;
const getEachIndexName = expression => isSequenceExpression(expression.left) ? expression.left.expressions[1] : null;
const getEachValue = expression => expression.right;
const nameToliteral = compose(builders.literal, getName);

const generateEachItemNameKey = expression => simplePropertyNode(
  BINDING_ITEM_NAME_KEY,
  compose(nameToliteral, getEachItemName)(expression)
);

const generateEachIndexNameKey = expression => simplePropertyNode(
  BINDING_INDEX_NAME_KEY,
  compose(nameToliteral, getEachIndexName)(expression)
);

const generateEachEvaluateKey = (expression, eachExpression, sourceFile, sourceCode) => simplePropertyNode(
  BINDING_EVALUATE_KEY,
  compose(
    e => toScopedFunction(e, sourceFile, sourceCode),
    e => ({
      ...eachExpression,
      text: generateJavascript(e).code
    }),
    getEachValue
  )(expression)
);

/**
 * Get the each expression properties to create properly the template binding
 * @param   { DomBinding.Expression } eachExpression - original each expression data
 * @param   { string } sourceFile - original tag file
 * @param   { string } sourceCode - original tag source code
 * @returns { Array } AST nodes that are needed to build an each binding
 */
function generateEachExpressionProperties(eachExpression, sourceFile, sourceCode) {
  const ast = createASTFromExpression(eachExpression, sourceFile, sourceCode);
  const body = ast.program.body;
  const firstNode = body[0];

  if (!isExpressionStatement(firstNode)) {
    panic(`The each directives supported should be of type "ExpressionStatement",you have provided a "${firstNode.type}"`);
  }

  const { expression } = firstNode;

  return [
    generateEachItemNameKey(expression),
    generateEachIndexNameKey(expression),
    generateEachEvaluateKey(expression, eachExpression, sourceFile, sourceCode)
  ]
}

/**
 * Transform a RiotParser.Node.Tag into an each binding
 * @param   { RiotParser.Node.Tag } sourceNode - tag containing the each attribute
 * @param   { string } selectorAttribute - attribute needed to select the target node
 * @param   { string } sourceFile - source file path
 * @param   { string } sourceCode - original source
 * @returns { AST.Node } an each binding node
 */
function createEachBinding(sourceNode, selectorAttribute, sourceFile, sourceCode) {
  const [ifAttribute, eachAttribute, keyAttribute] = [
    findIfAttribute,
    findEachAttribute,
    findKeyAttribute
  ].map(f => f(sourceNode));
  const attributeOrNull = attribute => attribute ? toScopedFunction(getAttributeExpression(attribute), sourceFile, sourceCode) : nullNode();

  return builders.objectExpression([
    simplePropertyNode(BINDING_TYPE_KEY,
      builders.memberExpression(
        builders.identifier(BINDING_TYPES),
        builders.identifier(EACH_BINDING_TYPE),
        false
      ),
    ),
    simplePropertyNode(BINDING_GET_KEY_KEY, attributeOrNull(keyAttribute)),
    simplePropertyNode(BINDING_CONDITION_KEY, attributeOrNull(ifAttribute)),
    createTemplateProperty(createNestedBindings(sourceNode, sourceFile, sourceCode, selectorAttribute)),
    ...createSelectorProperties(selectorAttribute),
    ...compose(generateEachExpressionProperties, getAttributeExpression)(eachAttribute)
  ])
}

/**
 * Transform a RiotParser.Node.Tag into an if binding
 * @param   { RiotParser.Node.Tag } sourceNode - tag containing the if attribute
 * @param   { string } selectorAttribute - attribute needed to select the target node
 * @param   { stiring } sourceFile - source file path
 * @param   { string } sourceCode - original source
 * @returns { AST.Node } an if binding node
 */
function createIfBinding(sourceNode, selectorAttribute, sourceFile, sourceCode) {
  const ifAttribute = findIfAttribute(sourceNode);

  return builders.objectExpression([
    simplePropertyNode(BINDING_TYPE_KEY,
      builders.memberExpression(
        builders.identifier(BINDING_TYPES),
        builders.identifier(IF_BINDING_TYPE),
        false
      ),
    ),
    simplePropertyNode(
      BINDING_EVALUATE_KEY,
      toScopedFunction(ifAttribute.expressions[0], sourceFile, sourceCode)
    ),
    ...createSelectorProperties(selectorAttribute),
    createTemplateProperty(createNestedBindings(sourceNode, sourceFile, sourceCode, selectorAttribute))
  ])
}

/**
 * Create a simple attribute expression
 * @param   {RiotParser.Node.Attr} sourceNode - the custom tag
 * @param   {string} sourceFile - source file path
 * @param   {string} sourceCode - original source
 * @returns {AST.Node} object containing the expression binding keys
 */
function createAttributeExpression(sourceNode, sourceFile, sourceCode) {
  return builders.objectExpression([
    simplePropertyNode(BINDING_TYPE_KEY,
      builders.memberExpression(
        builders.identifier(EXPRESSION_TYPES),
        builders.identifier(ATTRIBUTE_EXPRESSION_TYPE),
        false
      ),
    ),
    simplePropertyNode(BINDING_NAME_KEY, isSpreadAttribute(sourceNode) ? nullNode() : builders.literal(sourceNode.name)),
    simplePropertyNode(
      BINDING_EVALUATE_KEY,
      createAttributeEvaluationFunction(sourceNode, sourceFile, sourceCode)
    )
  ])
}

/**
 * Create a simple event expression
 * @param   {RiotParser.Node.Attr} sourceNode - attribute containing the event handlers
 * @param   {string} sourceFile - source file path
 * @param   {string} sourceCode - original source
 * @returns {AST.Node} object containing the expression binding keys
 */
function createEventExpression(sourceNode, sourceFile, sourceCode) {
  return builders.objectExpression([
    simplePropertyNode(BINDING_TYPE_KEY,
      builders.memberExpression(
        builders.identifier(EXPRESSION_TYPES),
        builders.identifier(EVENT_EXPRESSION_TYPE),
        false
      ),
    ),
    simplePropertyNode(BINDING_NAME_KEY, builders.literal(sourceNode.name)),
    simplePropertyNode(
      BINDING_EVALUATE_KEY,
      createAttributeEvaluationFunction(sourceNode, sourceFile, sourceCode)
    )
  ])
}

/**
 * Generate the pure immutable string chunks from a RiotParser.Node.Text
 * @param   {RiotParser.Node.Text} node - riot parser text node
 * @param   {string} sourceCode sourceCode - source code
 * @returns {Array} array containing the immutable string chunks
 */
function generateLiteralStringChunksFromNode(node, sourceCode) {
  return node.expressions.reduce((chunks, expression, index) => {
    const start = index ? node.expressions[index - 1].end : node.start;

    chunks.push(sourceCode.substring(start, expression.start));

    // add the tail to the string
    if (index === node.expressions.length - 1)
      chunks.push(sourceCode.substring(expression.end, node.end));

    return chunks
  }, []).map(str => node.unescape ? unescapeChar(str, node.unescape) : str)
}

/**
 * Simple bindings might contain multiple expressions like for example: "{foo} and {bar}"
 * This helper aims to merge them in a template literal if it's necessary
 * @param   {RiotParser.Node} node - riot parser node
 * @param   {string} sourceFile - original tag file
 * @param   {string} sourceCode - original tag source code
 * @returns { Object } a template literal expression object
 */
function mergeNodeExpressions(node, sourceFile, sourceCode) {
  if (node.parts.length === 1)
    return transformExpression(node.expressions[0], sourceFile, sourceCode)

  const pureStringChunks = generateLiteralStringChunksFromNode(node, sourceCode);
  const stringsArray = pureStringChunks.reduce((acc, str, index) => {
    const expr = node.expressions[index];

    return [
      ...acc,
      builders.literal(str),
      expr ? transformExpression(expr, sourceFile, sourceCode) : nullNode()
    ]
  }, [])
    // filter the empty literal expressions
    .filter(expr => !isLiteral(expr) || expr.value);

  return createArrayString(stringsArray)
}

/**
 * Create a text expression
 * @param   {RiotParser.Node.Text} sourceNode - text node to parse
 * @param   {string} sourceFile - source file path
 * @param   {string} sourceCode - original source
 * @param   {number} childNodeIndex - position of the child text node in its parent children nodes
 * @returns {AST.Node} object containing the expression binding keys
 */
function createTextExpression(sourceNode, sourceFile, sourceCode, childNodeIndex) {
  return builders.objectExpression([
    simplePropertyNode(BINDING_TYPE_KEY,
      builders.memberExpression(
        builders.identifier(EXPRESSION_TYPES),
        builders.identifier(TEXT_EXPRESSION_TYPE),
        false
      ),
    ),
    simplePropertyNode(
      BINDING_CHILD_NODE_INDEX_KEY,
      builders.literal(childNodeIndex)
    ),
    simplePropertyNode(
      BINDING_EVALUATE_KEY,
      wrapASTInFunctionWithScope(
        mergeNodeExpressions(sourceNode, sourceFile, sourceCode)
      )
    )
  ])
}

function createValueExpression(sourceNode, sourceFile, sourceCode) {
  return builders.objectExpression([
    simplePropertyNode(BINDING_TYPE_KEY,
      builders.memberExpression(
        builders.identifier(EXPRESSION_TYPES),
        builders.identifier(VALUE_EXPRESSION_TYPE),
        false
      ),
    ),
    simplePropertyNode(
      BINDING_EVALUATE_KEY,
      createAttributeEvaluationFunction(sourceNode, sourceFile, sourceCode)
    )
  ])
}

function createExpression(sourceNode, sourceFile, sourceCode, childNodeIndex, parentNode) {
  switch (true) {
  case isTextNode(sourceNode):
    return createTextExpression(sourceNode, sourceFile, sourceCode, childNodeIndex)
  // progress nodes value attributes will be rendered as attributes
  // see https://github.com/riot/compiler/issues/122
  case isValueAttribute(sourceNode) && hasValueAttribute(parentNode.name) && !isProgressNode(parentNode):
    return createValueExpression(sourceNode, sourceFile, sourceCode)
  case isEventAttribute(sourceNode):
    return createEventExpression(sourceNode, sourceFile, sourceCode)
  default:
    return createAttributeExpression(sourceNode, sourceFile, sourceCode)
  }
}

/**
 * Create the attribute expressions
 * @param   {RiotParser.Node} sourceNode - any kind of node parsed via riot parser
 * @param   {string} sourceFile - source file path
 * @param   {string} sourceCode - original source
 * @returns {Array} array containing all the attribute expressions
 */
function createAttributeExpressions(sourceNode, sourceFile, sourceCode) {
  return findDynamicAttributes(sourceNode)
    .map(attribute => createExpression(attribute, sourceFile, sourceCode, 0, sourceNode))
}

/**
 * Create the text node expressions
 * @param   {RiotParser.Node} sourceNode - any kind of node parsed via riot parser
 * @param   {string} sourceFile - source file path
 * @param   {string} sourceCode - original source
 * @returns {Array} array containing all the text node expressions
 */
function createTextNodeExpressions(sourceNode, sourceFile, sourceCode) {
  const childrenNodes = getChildrenNodes(sourceNode);

  return childrenNodes
    .filter(isTextNode)
    .filter(hasExpressions)
    .map(node => createExpression(
      node,
      sourceFile,
      sourceCode,
      childrenNodes.indexOf(node),
      sourceNode
    ))
}

/**
 * Add a simple binding to a riot parser node
 * @param   { RiotParser.Node.Tag } sourceNode - tag containing the if attribute
 * @param   { string } selectorAttribute - attribute needed to select the target node
 * @param   { string } sourceFile - source file path
 * @param   { string } sourceCode - original source
 * @returns { AST.Node } an each binding node
 */
function createSimpleBinding(sourceNode, selectorAttribute, sourceFile, sourceCode) {
  return builders.objectExpression([
    ...createSelectorProperties(selectorAttribute),
    simplePropertyNode(
      BINDING_EXPRESSIONS_KEY,
      builders.arrayExpression([
        ...createTextNodeExpressions(sourceNode, sourceFile, sourceCode),
        ...createAttributeExpressions(sourceNode, sourceFile, sourceCode)
      ])
    )
  ])
}

/**
 * Transform a RiotParser.Node.Tag of type slot into a slot binding
 * @param   { RiotParser.Node.Tag } sourceNode - slot node
 * @param   { string } selectorAttribute - attribute needed to select the target node
 * @returns { AST.Node } a slot binding node
 */
function createSlotBinding(sourceNode, selectorAttribute) {
  const slotNameAttribute = findAttribute(NAME_ATTRIBUTE, sourceNode);
  const slotName = slotNameAttribute ? slotNameAttribute.value : DEFAULT_SLOT_NAME;

  return builders.objectExpression([
    simplePropertyNode(BINDING_TYPE_KEY,
      builders.memberExpression(
        builders.identifier(BINDING_TYPES),
        builders.identifier(SLOT_BINDING_TYPE),
        false
      ),
    ),
    simplePropertyNode(
      BINDING_NAME_KEY,
      builders.literal(slotName)
    ),
    ...createSelectorProperties(selectorAttribute)
  ])
}

/**
 * Find the slots in the current component and group them under the same id
 * @param   {RiotParser.Node.Tag} sourceNode - the custom tag
 * @returns {Object} object containing all the slots grouped by name
 */
function groupSlots(sourceNode) {
  return getChildrenNodes(sourceNode).reduce((acc, node) => {
    const slotAttribute = findSlotAttribute(node);

    if (slotAttribute) {
      acc[slotAttribute.value] = node;
    } else {
      acc.default = createRootNode({
        nodes: [...getChildrenNodes(acc.default), node]
      });
    }

    return acc
  }, {
    default: null
  })
}

/**
 * Create the slot entity to pass to the riot-dom bindings
 * @param   {string} id - slot id
 * @param   {RiotParser.Node.Tag} sourceNode - slot root node
 * @param   {string} sourceFile - source file path
 * @param   {string} sourceCode - original source
 * @returns {AST.Node} ast node containing the slot object properties
 */
function buildSlot(id, sourceNode, sourceFile, sourceCode) {
  const cloneNode = {
    ...sourceNode,
    // avoid to render the slot attribute
    attributes: getNodeAttributes(sourceNode).filter(attribute => attribute.name !== SLOT_ATTRIBUTE)
  };
  const [html, bindings] = build(cloneNode, sourceFile, sourceCode);

  return builders.objectExpression([
    simplePropertyNode(BINDING_ID_KEY, builders.literal(id)),
    simplePropertyNode(BINDING_HTML_KEY, builders.literal(html)),
    simplePropertyNode(BINDING_BINDINGS_KEY, builders.arrayExpression(bindings))
  ])
}

/**
 * Create the AST array containing the slots
 * @param   { RiotParser.Node.Tag } sourceNode - the custom tag
 * @param   { string } sourceFile - source file path
 * @param   { string } sourceCode - original source
 * @returns {AST.ArrayExpression} array containing the attributes to bind
 */
function createSlotsArray(sourceNode, sourceFile, sourceCode) {
  return builders.arrayExpression([
    ...compose(
      slots => slots.map(([key, value]) => buildSlot(key, value, sourceFile, sourceCode)),
      slots => slots.filter(([,value]) => value),
      Object.entries,
      groupSlots
    )(sourceNode)
  ])
}

/**
 * Create the AST array containing the attributes to bind to this node
 * @param   { RiotParser.Node.Tag } sourceNode - the custom tag
 * @param   { string } selectorAttribute - attribute needed to select the target node
 * @param   { string } sourceFile - source file path
 * @param   { string } sourceCode - original source
 * @returns {AST.ArrayExpression} array containing the slot objects
 */
function createBindingAttributes(sourceNode, selectorAttribute, sourceFile, sourceCode) {
  return builders.arrayExpression([
    ...compose(
      attributes => attributes.map(attribute => createExpression(attribute, sourceFile, sourceCode, 0, sourceNode)),
      attributes => getAttributesWithoutSelector(attributes, selectorAttribute), // eslint-disable-line
      cleanAttributes
    )(sourceNode)
  ])
}

/**
 * Find the slot attribute if it exists
 * @param   {RiotParser.Node.Tag} sourceNode - the custom tag
 * @returns {RiotParser.Node.Attr|undefined} the slot attribute found
 */
function findSlotAttribute(sourceNode) {
  return getNodeAttributes(sourceNode).find(attribute => attribute.name === SLOT_ATTRIBUTE)
}

/**
 * Transform a RiotParser.Node.Tag into a tag binding
 * @param   { RiotParser.Node.Tag } sourceNode - the custom tag
 * @param   { string } selectorAttribute - attribute needed to select the target node
 * @param   { string } sourceFile - source file path
 * @param   { string } sourceCode - original source
 * @returns { AST.Node } tag binding node
 */
function createTagBinding(sourceNode, selectorAttribute, sourceFile, sourceCode) {
  return builders.objectExpression([
    simplePropertyNode(BINDING_TYPE_KEY,
      builders.memberExpression(
        builders.identifier(BINDING_TYPES),
        builders.identifier(TAG_BINDING_TYPE),
        false
      ),
    ),
    simplePropertyNode(BINDING_GET_COMPONENT_KEY, builders.identifier(GET_COMPONENT_FN)),
    simplePropertyNode(
      BINDING_EVALUATE_KEY,
      toScopedFunction(getCustomNodeNameAsExpression(sourceNode), sourceFile, sourceCode)
    ),
    simplePropertyNode(BINDING_SLOTS_KEY, createSlotsArray(sourceNode, sourceFile, sourceCode)),
    simplePropertyNode(
      BINDING_ATTRIBUTES_KEY,
      createBindingAttributes(sourceNode, selectorAttribute, sourceFile, sourceCode)
    ),
    ...createSelectorProperties(selectorAttribute)
  ])
}

const BuildingState = Object.freeze({
  html: [],
  bindings: [],
  parent: null
});

/**
 * Nodes having bindings should be cloned and new selector properties should be added to them
 * @param   {RiotParser.Node} sourceNode - any kind of node parsed via riot parser
 * @param   {string} bindingsSelector - temporary string to identify the current node
 * @returns {RiotParser.Node} the original node parsed having the new binding selector attribute
 */
function createBindingsTag(sourceNode, bindingsSelector) {
  if (!bindingsSelector) return sourceNode

  return {
    ...sourceNode,
    // inject the selector bindings into the node attributes
    attributes: [{
      name: bindingsSelector,
      value: bindingsSelector
    }, ...getNodeAttributes(sourceNode)]
  }
}

/**
 * Create a generic dynamic node (text or tag) and generate its bindings
 * @param   {RiotParser.Node} sourceNode - any kind of node parsed via riot parser
 * @param   {string} sourceFile - source file path
 * @param   {string} sourceCode - original source
 * @param   {BuildingState} state - state representing the current building tree state during the recursion
 * @returns {Array} array containing the html output and bindings for the current node
 */
function createDynamicNode(sourceNode, sourceFile, sourceCode, state) {
  switch (true) {
  case isTextNode(sourceNode):
    // text nodes will not have any bindings
    return [nodeToString(sourceNode), []]
  default:
    return createTagWithBindings(sourceNode, sourceFile, sourceCode)
  }
}

/**
 * Create only a dynamic tag node with generating a custom selector and its bindings
 * @param   {RiotParser.Node} sourceNode - any kind of node parsed via riot parser
 * @param   {string} sourceFile - source file path
 * @param   {string} sourceCode - original source
 * @param   {BuildingState} state - state representing the current building tree state during the recursion
 * @returns {Array} array containing the html output and bindings for the current node
 */
function createTagWithBindings(sourceNode, sourceFile, sourceCode) {
  const bindingsSelector = isRootNode(sourceNode) ? null : createBindingSelector();
  const cloneNode = createBindingsTag(sourceNode, bindingsSelector);
  const tagOpeningHTML = nodeToString(cloneNode);

  switch(true) {
  // EACH bindings have prio 1
  case hasEachAttribute(cloneNode):
    return [tagOpeningHTML, [createEachBinding(cloneNode, bindingsSelector, sourceFile, sourceCode)]]
  // IF bindings have prio 2
  case hasIfAttribute(cloneNode):
    return [tagOpeningHTML, [createIfBinding(cloneNode, bindingsSelector, sourceFile, sourceCode)]]
  // TAG bindings have prio 3
  case isCustomNode(cloneNode):
    return [tagOpeningHTML, [createTagBinding(cloneNode, bindingsSelector, sourceFile, sourceCode)]]
  // slot tag
  case isSlotNode(cloneNode):
    return [tagOpeningHTML, [createSlotBinding(cloneNode, bindingsSelector)]]
  // this node has expressions bound to it
  default:
    return [tagOpeningHTML, [createSimpleBinding(cloneNode, bindingsSelector, sourceFile, sourceCode)]]
  }
}

/**
 * Parse a node trying to extract its template and bindings
 * @param   {RiotParser.Node} sourceNode - any kind of node parsed via riot parser
 * @param   {string} sourceFile - source file path
 * @param   {string} sourceCode - original source
 * @param   {BuildingState} state - state representing the current building tree state during the recursion
 * @returns {Array} array containing the html output and bindings for the current node
 */
function parseNode(sourceNode, sourceFile, sourceCode, state) {
  // static nodes have no bindings
  if (isStaticNode(sourceNode)) return [nodeToString(sourceNode), []]
  return createDynamicNode(sourceNode, sourceFile, sourceCode)
}

/**
 * Create the tag binding
 * @param   { RiotParser.Node.Tag } sourceNode - tag containing the each attribute
 * @param   { string } sourceFile - source file path
 * @param   { string } sourceCode - original source
 * @param   { string } selector - binding selector
 * @returns { Array } array with only the tag binding AST
 */
function createNestedBindings(sourceNode, sourceFile, sourceCode, selector) {
  const mightBeARiotComponent = isCustomNode(sourceNode);

  return mightBeARiotComponent ? [null, [
    createTagBinding(
      cloneNodeWithoutSelectorAttribute(sourceNode, selector),
      null,
      sourceFile,
      sourceCode
    )]
  ] : build(createRootNode(sourceNode), sourceFile, sourceCode)
}

/**
 * Build the template and the bindings
 * @param   {RiotParser.Node} sourceNode - any kind of node parsed via riot parser
 * @param   {string} sourceFile - source file path
 * @param   {string} sourceCode - original source
 * @param   {BuildingState} state - state representing the current building tree state during the recursion
 * @returns {Array} array containing the html output and the dom bindings
 */
function build(
  sourceNode,
  sourceFile,
  sourceCode,
  state
) {
  if (!sourceNode) panic('Something went wrong with your tag DOM parsing, your tag template can\'t be created');

  const [nodeHTML, nodeBindings] = parseNode(sourceNode, sourceFile, sourceCode);
  const childrenNodes = getChildrenNodes(sourceNode);
  const currentState = { ...cloneDeep(BuildingState), ...state };

  // mutate the original arrays
  currentState.html.push(...nodeHTML);
  currentState.bindings.push(...nodeBindings);

  // do recursion if
  // this tag has children and it has no special directives bound to it
  if (childrenNodes.length && !hasItsOwnTemplate(sourceNode)) {
    childrenNodes.forEach(node => build(node, sourceFile, sourceCode, { parent: sourceNode, ...currentState }));
  }

  // close the tag if it's not a void one
  if (isTagNode(sourceNode) && !isVoidNode(sourceNode)) {
    currentState.html.push(closeTag(sourceNode));
  }

  return [
    currentState.html.join(''),
    currentState.bindings
  ]
}

const templateFunctionArguments = [
  TEMPLATE_FN,
  EXPRESSION_TYPES,
  BINDING_TYPES,
  GET_COMPONENT_FN
].map(builders.identifier);

/**
 * Create the content of the template function
 * @param   { RiotParser.Node } sourceNode - node generated by the riot compiler
 * @param   { string } sourceFile - source file path
 * @param   { string } sourceCode - original source
 * @returns {AST.BlockStatement} the content of the template function
 */
function createTemplateFunctionContent(sourceNode, sourceFile, sourceCode) {
  return builders.blockStatement([
    builders.returnStatement(
      callTemplateFunction(
        ...build(
          createRootNode(sourceNode),
          sourceFile,
          sourceCode
        )
      )
    )
  ])
}

/**
 * Extend the AST adding the new template property containing our template call to render the component
 * @param   { Object } ast - current output ast
 * @param   { string } sourceFile - source file path
 * @param   { string } sourceCode - original source
 * @param   { RiotParser.Node } sourceNode - node generated by the riot compiler
 * @returns { Object } the output ast having the "template" key
 */
function extendTemplateProperty(ast, sourceFile, sourceCode, sourceNode) {
  types.visit(ast, {
    visitProperty(path) {
      if (path.value.key.value === TAG_TEMPLATE_PROPERTY) {
        path.value.value = builders.functionExpression(
          null,
          templateFunctionArguments,
          createTemplateFunctionContent(sourceNode, sourceFile, sourceCode)
        );

        return false
      }

      this.traverse(path);
    }
  });

  return ast
}

/**
 * Generate the component template logic
 * @param   { RiotParser.Node } sourceNode - node generated by the riot compiler
 * @param   { string } source - original component source code
 * @param   { Object } meta - compilation meta information
 * @param   { AST } ast - current AST output
 * @returns { AST } the AST generated
 */
function template(sourceNode, source, meta, ast) {
  const { options } = meta;
  return  extendTemplateProperty(ast, options.file, source, sourceNode)
}

const DEFAULT_OPTIONS = {
  template: 'default',
  file: '[unknown-source-file]',
  scopedCss: true
};

/**
 * Create the initial AST
 * @param {string} tagName - the name of the component we have compiled
 * @returns { AST } the initial AST
 *
 * @example
 * // the output represents the following string in AST
 */
function createInitialInput({tagName}) {
  /*
  generates
  export default {
     ${TAG_CSS_PROPERTY}: null,
     ${TAG_LOGIC_PROPERTY}: null,
     ${TAG_TEMPLATE_PROPERTY}: null
  }
  */
  return builders.program([
    builders.exportDefaultDeclaration(
      builders.objectExpression([
        simplePropertyNode(TAG_CSS_PROPERTY, nullNode()),
        simplePropertyNode(TAG_LOGIC_PROPERTY, nullNode()),
        simplePropertyNode(TAG_TEMPLATE_PROPERTY, nullNode()),
        simplePropertyNode(TAG_NAME_PROPERTY, builders.literal(tagName))
      ])
    )]
  )
}

/**
 * Make sure the input sourcemap is valid otherwise we ignore it
 * @param   {SourceMapGenerator} map - preprocessor source map
 * @returns {Object} sourcemap as json or nothing
 */
function normaliseInputSourceMap(map) {
  const inputSourceMap = sourcemapAsJSON(map);
  return isEmptySourcemap(inputSourceMap) ? null : inputSourceMap
}

/**
 * Override the sourcemap content making sure it will always contain the tag source code
 * @param   {Object} map - sourcemap as json
 * @param   {string} source - component source code
 * @returns {Object} original source map with the "sourcesContent" property overriden
 */
function overrideSourcemapContent(map, source) {
  return {
    ...map,
    sourcesContent: [source]
  }
}

/**
 * Create the compilation meta object
 * @param { string } source - source code of the tag we will need to compile
 * @param { string } options - compiling options
 * @returns {Object} meta object
 */
function createMeta(source, options) {
  return {
    tagName: null,
    fragments: null,
    options: {
      ...DEFAULT_OPTIONS,
      ...options
    },
    source
  }
}

/**
 * Generate the output code source together with the sourcemap
 * @param { string } source - source code of the tag we will need to compile
 * @param { string } opts - compiling options
 * @returns { Output } object containing output code and source map
 */
function compile(source, opts = {}) {
  const meta = createMeta(source, opts);
  const {options} = meta;
  const { code, map } = execute$1('template', options.template, meta, source);
  const { template: template$1, css: css$1, javascript: javascript$1 } = riotParser(options).parse(code).output;

  // extend the meta object with the result of the parsing
  Object.assign(meta, {
    tagName: template$1.name,
    fragments: { template: template$1, css: css$1, javascript: javascript$1 }
  });

  return compose(
    result => ({ ...result, meta }),
    result => execute(result, meta),
    result => ({
      ...result,
      map: overrideSourcemapContent(result.map, source)
    }),
    ast => meta.ast = ast && generateJavascript(ast, {
      sourceMapName: `${options.file}.map`,
      inputSourceMap: normaliseInputSourceMap(map)
    }),
    hookGenerator(template, template$1, code, meta),
    hookGenerator(javascript, javascript$1, code, meta),
    hookGenerator(css, css$1, code, meta),
  )(createInitialInput(meta))
}

/**
 * Prepare the riot parser node transformers
 * @param   { Function } transformer - transformer function
 * @param   { Object } sourceNode - riot parser node
 * @param   { string } source - component source code
 * @param   { Object } meta - compilation meta information
 * @returns { Promise<Output> } object containing output code and source map
 */
function hookGenerator(transformer, sourceNode, source, meta) {
  if (
    // filter missing nodes
    !sourceNode ||
    // filter nodes without children
    (sourceNode.nodes && !sourceNode.nodes.length) ||
    // filter empty javascript and css nodes
    (!sourceNode.nodes && !sourceNode.text)) {
    return result => result
  }

  return curry(transformer)(sourceNode, source, meta)
}

// This function can be used to register new preprocessors
// a preprocessor can target either only the css or javascript nodes
// or the complete tag source file ('template')
const registerPreprocessor = register$1;

// This function can allow you to register postprocessors that will parse the output code
// here we can run prettifiers, eslint fixes...
const registerPostprocessor = register;

export { compile, createInitialInput, registerPostprocessor, registerPreprocessor };