#!/usr/bin/env node

const fs = require('fs')
const path = require('path')
const split = require('split2')

const data = []
const regex = /^#define\s+(\w+)\s+(\w+)/i
const header = path.resolve(
  __dirname,
  '../../deltachat-ffi/deltachat.h'
)

console.log('Generating constants...')

fs.createReadStream(header)
  .pipe(split())
  .on('data', (line) => {
    const match = regex.exec(line)
    if (match) {
      const key = match[1]
      const value = parseInt(match[2])
      if (isNaN(value)) return

      data.push({ key, value })
    }
  })
  .on('end', () => {
    const constants = data
      .filter(
        ({ key }) => key.toUpperCase()[0] === key[0] // check if define name is uppercase
      )
      .sort((lhs, rhs) => {
        if (lhs.key < rhs.key) return -1
        else if (lhs.key > rhs.key) return 1
        return 0
      })
      .map((row) => {
        return `  ${row.key}: ${row.value}`
      })
      .join(',\n')

    const events = data
      .sort((lhs, rhs) => {
        if (lhs.value < rhs.value) return -1
        else if (lhs.value > rhs.value) return 1
        return 0
      })
      .filter((i) => {
        return i.key.startsWith('DC_EVENT_')
      })
      .map((i) => {
        return `  ${i.value}: '${i.key}'`
      })
      .join(',\n')

    // backwards compat
    fs.writeFileSync(
      path.resolve(__dirname, '../constants.js'),
      `// Generated!\n\nmodule.exports = {\n${constants}\n}\n`
    )
    // backwards compat
    fs.writeFileSync(
      path.resolve(__dirname, '../events.js'),
      `/* eslint-disable quotes */\n// Generated!\n\nmodule.exports = {\n${events}\n}\n`
    )

    fs.writeFileSync(
      path.resolve(__dirname, '../lib/constants.ts'),
      `// Generated!\n\nexport enum C {\n${constants.replace(/:/g, ' =')},\n}\n
// Generated!\n\nexport const EventId2EventName: { [key: number]: string } = {\n${events},\n}\n`
    )
  })