#!/usr/bin/env node
const fs = require('fs')
const forEach = require('async-foreach').forEach

var all = {}
var allIds = []

/* read existing translation files in lang/ */
fs.readdir('lang', function (err, files) {
  forEach(files, function (f) {
    let m = f.match(/^(.*)\.json$/)
    if (!m) {
      return
    }

    let done = this.async()
    let lang = m[1]

    fs.readFile('lang/' + f, function (err) {
      if (!(lang in all)) {
        all[lang] = {}
      }

      done()
    })
  })
})

fs.readdir(
  '.',
  function (err, files) {
    forEach(
      files,
      function (f) {
        if (f === 'package.json') {
          return
        }

        let m = f.match(/^(.*)\.json$/)
        if (!m) {
          return
        }

        let done = this.async()
        let id = m[1]
        allIds.push('category:' + id)

        fs.readFile(f, function (err, contents) {
          let data = JSON.parse(contents)

          if ('name' in data) {
            for (var lang in data.name) {
              if (!(lang in all)) {
                all[lang] = {}
              }

              all[lang]['category:' + id] = data.name[lang]
            }

            if (data.type && data.type === 'index') {
              parseSubCategories(data.subCategories, all)
            }
            if (data.type && data.type === 'overpass') {
              if (data.lists) {
                for (let listId in data.lists) {
                  let list = data.lists[listId]
                  let langStrId = 'category:' + id + ':' + listId

                  allIds.push(langStrId)
                  for (let lang in list.name) {
                    all[lang][langStrId] = list.name[lang]
                  }
                }
              }
            }
          }

          done()
        })
      },
      writeTranslationFiles
    )
  }
)

function parseSubCategories(categories, all) {
  categories.forEach(data => {
    if ('name' in data) {
      for (var lang in data.name) {
        if (!(lang in all)) {
          all[lang] = {}
        }

        allIds.push('category:' + data.id)
        all[lang]['category:' + data.id] = data.name[lang]
      }

      if (data.type && data.type === 'index') {
        parseSubCategories(data.subCategories, all)
      }
    }
  })
}

function writeTranslationFiles () {
  forEach(Object.keys(all), function (lang) {
    let done = this.async()

    allIds = allIds.sort()
    let data = {}
    allIds.forEach(function (id) {
      data[id] = ''
    })

    let keys = Object.keys(all[lang])
    keys.sort()
    for (let i = 0; i < keys.length; i++) {
      data[keys[i]] = all[lang][keys[i]]
    }

    fs.writeFile(
      'lang/' + lang + '.json',
      JSON.stringify(data, null, '    ') + '\n',
      function (err, result) {
        done()
      }
    )
  })
}