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import { Node, NodeType } from './types/Node'
import { ParseText } from './types/Parser'

import parser from './parser'

const parseText: ParseText = text => {
  const children: Node[] = []
  let textBuffer = ''

  const flush = () => {
    if (!textBuffer) {
      return
    }

    children.push({
      type: NodeType.Text,
      text: textBuffer,
      source: textBuffer
    })

    textBuffer = ''
  }

  let i = 0
  const l = text.length

  while (i < l) {
    const match = parser(text, i, parseText)

    if (match) {
      flush()

      const [node, position] = match
      children.push(node)
      i = position
      continue
    }

    textBuffer += text.charAt(i)
    i += 1
  }

  flush()

  return children
}

export const parse = (message: string): Node => {
  return {
    type: NodeType.Root,
    children: parseText(message),
    source: message
  }
}

export default parse

export * from './types/Node'