module.exports = class Definitions {
  constructor (editor) {
    this.editor = editor
    this.alreadyAlerted = ''

    this.init()
  }

  init () {
    this.definitions = {}
    this.definitionParagraphsInClause = []
    this.usedDefinitions = {}
    this.definedDefinitions = {}
    this.undefinedDefinitions = {}
    this.otherDefinitions = {}
    this.definitionClauseContent = ''
    this.definitionClauseEndIndex = null
  }

  boot () {
    this.init()

    const success = this.getDefinitionClause()
    if (!success) {
      return
    }

    this.setUsedDefinitions()
    this.setDefinitions()
    this.setDefinedDefinitions()
  }

  getDefinitionClause () {
    const content = this.editor.getText()
    const reg = /(# Definitions)([a-z]*[A-Z]*[ ]*)*/g
    const result = [...content.matchAll(reg)]

    if (result.length === 0) {
      const message = 'There is no definition clause defined.'

      if (!this.alreadyAlerted || message !== this.alreadyAlerted) {
        alert(message)
        this.alreadyAlerted = 'message'
      }

      return false
    }

    if (result.length > 1) {
      const message = `There are ${result.length} definition clauses. There should only be one.`

      if (!this.alreadyAlerted || message !== this.alreadyAlerted) {
        alert(message)
        this.alreadyAlerted = message
      }

      return false
    }

    // Definition clause index
    const index = result[0].index
    let text = content.substring(index)
    // Text containing the Definition clause heading
    let startText = result[0][0]
    this.definitionClauseEndIndex = index + startText.length
    // Remove the text containing the Definition clause heading so we can look for the next clause
    text = text.substring(startText.length)

    const nextClauseReg = /[^#]# ([a-z]*[A-Z]*)*/g
    const nextClauseResult = [...text.matchAll(nextClauseReg)]
    let nextClauseIndex = nextClauseResult.length > 0 ? nextClauseResult[0].index : text.length

    text = text.substring(0, nextClauseIndex)
    // Build the full content of the Definition clause
    this.definitionClauseContent = startText.concat(text)

    return true
  }

  setUsedDefinitions () {
    const content = this.editor.getText()
    const reg = /_([^_\n]*)_/g

    for (let match of content.matchAll(reg)) {
      if (!match[1]) {
        continue
      }

      if (!this.usedDefinitions.hasOwnProperty(match[1])) {
        this.usedDefinitions[match[1]] = []
      }

      this.usedDefinitions[match[1]].push(match.index)
    }
  }

  setDefinitions () {
    const content = this.editor.getText()
    const reg = /\*\*([^**\n]*)\*\*/g

    for (let match of content.matchAll(reg)) {
      if (!match[1]) {
        continue
      }

      if (!this.definitions.hasOwnProperty(match[1])) {
        this.definitions[match[1]] = []
      }

      this.definitions[match[1]].push(match.index)
    }
  }

  setDefinedDefinitions () {
    const regex = /## (.)*\n/g
    const definitionParagraphsInClause = this.definitionClauseContent.matchAll(regex)
    const definitionsMapper = JSON.parse(JSON.stringify(this.definitions))

    for (let definitionParagraph of definitionParagraphsInClause) {
      if (definitionParagraph && definitionParagraph[0]) {
        this.definitionParagraphsInClause.push(definitionParagraph)

        let definitionContent = definitionParagraph[0]
        let found = false

        for (let definition of Object.keys(definitionsMapper)) {
          const definitionToSearch = `**${definition}** means `
          let index = definitionContent.indexOf(definitionToSearch)

          if (index !== -1) {
            let definitionExtracted = definitionContent.substring(index + definitionToSearch.length)
            definitionExtracted = definitionExtracted.replace('[', '')
            definitionExtracted = definitionExtracted.replace(']', '')
            definitionExtracted = definitionExtracted.trim()

            if (definitionExtracted.length > 0) {
              this.definedDefinitions[definition] = definitionExtracted
            } else {
              this.undefinedDefinitions[definition] = true
            }

            delete definitionsMapper[definition]

            found = true
            break
          }
          // let results = definitionContent.match(new RegExp(`(${definition} means )([[(.)*]])`))
          // if (results && results[0]) {
          //
          //
          // }
        }

        if (!found) {
          this.otherDefinitions[definitionContent] = true
        }
      }
    }

    if (Object.keys(definitionsMapper).length > 0) {
      this.insertDefinitions(Object.keys(definitionsMapper))

      // Refresh this because it contains more definition paragraphs
      this.getDefinitionClause()
    }
  }

  insertDefinitions (definitions) {
    let currentRow = this.getRowPositionToInsertDefinitions()
    const currentPosition = this.editor.getCursorBufferPosition()

    for (let definition of definitions) {
      this.editor.setCursorBufferPosition([currentRow, 0])
      this.editor.insertText(`## **${definition}** means []\n`)
      currentRow = currentRow + 1

      this.undefinedDefinitions[definition] = true
    }

    this.editor.setCursorBufferPosition(currentPosition)
  }

  getRowPositionToInsertDefinitions () {
    const content = this.editor.getText()
    const reg = /\n/g
    const results = content.matchAll(reg)
    let linesCount = 0

    for (let result of results) {
      if (result.index === this.definitionClauseEndIndex) {
        return linesCount + 1 + this.definitionParagraphsInClause.length
      } else {
        linesCount = linesCount + 1
      }
    }

    return linesCount
  }

  getDefinedDefinitions () {
    return Object.keys(this.definedDefinitions)
  }
}