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import { NodeType } from './types/Node'

import { explicit, or, regexp, topOfLine } from './combinator'

const parseBold = explicit(
  regexp(
    /^\*(\S([^*\n]*?|[^*\n]*? `.*?` )\S|\S)\*(?=[\s.,\])}!?\-=]|$)/,
    (match, text, position, parseText) => {
      const [matchedText, content] = match

      return [
        {
          type: NodeType.Bold,
          children: parseText(content),
          source: matchedText
        },
        position + matchedText.length
      ]
    }
  )
)

const parseCode = explicit(
  regexp(/^`([^`]+?)`(?=[\s.,\])}!?\-=]|$)/, (match, text, position) => {
    const [matchedText, content] = match

    return [
      {
        type: NodeType.Code,
        text: content,
        source: matchedText
      },
      position + matchedText.length
    ]
  })
)

const parsePreText = explicit(
  regexp(
    /^```(\s*\S[\s\S]*?\s*)```(?=[\s.,\])}!?\-=]|$)/,
    (match, text, position) => {
      const [matchedText, content] = match

      return [
        {
          type: NodeType.PreText,
          text: content,
          source: matchedText
        },
        position + matchedText.length
      ]
    }
  )
)

const parseItalic = explicit(
  regexp(
    /^_(\S([^_\n]*?|[^_\n]*? `.*?` )\S|\S)\_(?=[\s.,\])}!?\-=]|$)/,
    (match, text, position, parseText) => {
      const [matchedText, content] = match

      return [
        {
          type: NodeType.Italic,
          children: parseText(content),
          source: matchedText
        },
        position + matchedText.length
      ]
    }
  )
)

const parseStrike = explicit(
  regexp(
    /^~(\S([^~\n]*?|[^~\n]*? `.*?` )\S|\S)\~(?=[\s.,\])}!?\-=]|$)/,
    (match, text, position, parseText) => {
      const [matchedText, content] = match

      return [
        {
          type: NodeType.Strike,
          children: parseText(content),
          source: matchedText
        },
        position + matchedText.length
      ]
    }
  )
)

const parseSingleLineQuote = topOfLine(
  regexp(/^>(.*)(\n|$)/, (match, text, position, parseText) => {
    const [matchedText, content] = match

    const repeatedGt = content.match(/^((>)+)(.*)$/)

    return [
      {
        type: NodeType.Quote,
        children: repeatedGt
          ? [
              {
                type: NodeType.Text,
                text: repeatedGt[1],
                source: repeatedGt[1]
              },
              ...parseText(repeatedGt[3])
            ]
          : parseText(content),
        source: matchedText
      },
      position + matchedText.length
    ]
  })
)

const parseMultilineQuote = topOfLine(
  regexp(/^>>>([\s\S]+)$/, (match, text, position, parseText) => {
    const [matchedText, content] = match

    return [
      {
        type: NodeType.Quote,
        children: parseText(content),
        source: matchedText
      },
      position + matchedText.length
    ]
  })
)

const parseEmoji = regexp(
  /^:([^:<`*#@!\s()$%]+):(:(skin-tone-.+?):)?/,
  (match, text, position) => {
    const [matchedText, name, _, variation] = match

    return [
      {
        type: NodeType.Emoji,
        name,
        variation,
        source: matchedText
      },
      position + matchedText.length
    ]
  }
)

const parseLink = regexp(
  /^<([^\s<>][^\n<>]*?)(\|([^<>]+?))?>/,
  (match, text, position, parseText) => {
    const [matchedText, link, _, label] = match
    const nextPosition = position + matchedText.length
    const labelNodes = label ? parseText(label) : undefined

    switch (link.charAt(0)) {
      case '@':
        return [
          {
            type: NodeType.UserLink,
            userID: link.slice(1),
            label: labelNodes,
            source: matchedText
          },
          nextPosition
        ]
      case '#':
        return [
          {
            type: NodeType.ChannelLink,
            channelID: link.slice(1),
            label: labelNodes,
            source: matchedText
          },
          nextPosition
        ]
      case '!':
        const [commandName, ...args] = link.slice(1).split('^')

        return [
          {
            type: NodeType.Command,
            name: commandName,
            arguments: args,
            label: labelNodes,
            source: matchedText
          },
          nextPosition
        ]
      default:
        return [
          {
            type: NodeType.URL,
            url: link,
            label: labelNodes,
            source: matchedText
          },
          nextPosition
        ]
    }
  }
)

export default or([
  parseBold,
  parsePreText,
  parseCode,
  parseEmoji,
  parseItalic,
  parseMultilineQuote,
  parseSingleLineQuote,
  parseLink,
  parseStrike
])