martinheidegger/i18n-core

'use strict'

var path = require('path')
var makeFlat = require('../lib/makeFlat')

module.exports = function (folder, strategy) {
  // need to load here, because it needs a mock for testing.
  var fs = require('fs')
  var getRaw = function getRaw (file) {
    try {
      return fs.readFileSync(file, 'utf8')
    } catch (e) {}
    return null
  }
  var exists = function exists (file) {
    var exists = false
    try {
      exists = fs.existsSync(file)
    } catch (e) {}
    return exists
  }
  if (!strategy) {
    strategy = require('./folder/json.js')
  }

  return Object.create({
    cache: {},
    folder: folder,
    strategy: strategy,
    get: function (key) {
      var keyParts = /^([^.]*)(\.(.*))?$/m.exec(key)
      var prefix = keyParts[1]
      var property = keyParts[3] || ''
      var file = this.strategy.getFile(path.resolve(this.folder, prefix))
      var keyStorage = this.cache[file]
      var raw

      if (!keyStorage) {
        keyStorage = {
          data: {},
          file: file
        }
        if (exists(file)) {
          raw = getRaw(file)
          if (raw) {
            try {
              keyStorage.data = makeFlat(this.strategy.load(raw) || {}, {})
            } catch (e) {}
          }
        }
        keyStorage.time = Date.now()
        this.cache[file] = keyStorage
      }
      return keyStorage.data[property]
    }
  })
}