let tokenizer = require('postcss/lib/tokenize')
let Comment = require('postcss/lib/comment')
let Parser = require('postcss/lib/parser')

class SafeParser extends Parser {
  createTokenizer() {
    this.tokenizer = tokenizer(this.input, { ignoreErrors: true })
  }

  comment(token) {
    let node = new Comment()
    this.init(node, token[2])
    let pos =
      this.input.fromOffset(token[3]) ||
      this.input.fromOffset(this.input.css.length - 1)
    node.source.end = {
      offset: token[3],
      line: pos.line,
      column: pos.col
    }

    let text = token[1].slice(2)
    if (text.slice(-2) === '*/') text = text.slice(0, -2)

    if (/^\s*$/.test(text)) {
      node.text = ''
      node.raws.left = text
      node.raws.right = ''
    } else {
      let match = text.match(/^(\s*)([^]*\S)(\s*)$/)
      node.text = match[2]
      node.raws.left = match[1]
      node.raws.right = match[3]
    }
  }

  decl(tokens) {
    if (tokens.length > 1 && tokens.some(i => i[0] === 'word')) {
      super.decl(tokens)
    }
  }

  unclosedBracket() {}

  unknownWord(tokens) {
    this.spaces += tokens.map(i => i[1]).join('')
  }

  unexpectedClose() {
    this.current.raws.after += '}'
  }

  doubleColon() {}

  unnamedAtrule(node) {
    node.name = ''
  }

  precheckMissedSemicolon(tokens) {
    let colon = this.colon(tokens)
    if (colon === false) return

    let nextStart, prevEnd
    for (nextStart = colon - 1; nextStart >= 0; nextStart--) {
      if (tokens[nextStart][0] === 'word') break
    }
    if (nextStart === 0) return

    for (prevEnd = nextStart - 1; prevEnd >= 0; prevEnd--) {
      if (tokens[prevEnd][0] !== 'space') {
        prevEnd += 1
        break
      }
    }

    let other = tokens.slice(nextStart)
    let spaces = tokens.slice(prevEnd, nextStart)
    tokens.splice(prevEnd, tokens.length - prevEnd)
    this.spaces = spaces.map(i => i[1]).join('')

    this.decl(other)
  }

  checkMissedSemicolon() {}

  endFile() {
    if (this.current.nodes && this.current.nodes.length) {
      this.current.raws.semicolon = this.semicolon
    }
    this.current.raws.after = (this.current.raws.after || '') + this.spaces

    while (this.current.parent) {
      this.current = this.current.parent
      this.current.raws.after = ''
    }
  }
}

module.exports = SafeParser