/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

const random = require('../random')
const logger = require('../logging')

var o = null // eslint-disable-line no-unused-vars

class Objects {
  constructor () {
    this.counter = 0
    this.container = {}
  }

  add (category, member) {
    if (!member) {
      member = 'o' + this.counter
    }
    if (!this.has(category)) {
      this.container[category] = []
    }
    this.container[category].push({ type: category, name: member })
    ++this.counter
    return this.container[category].slice(-1)[0].name
  }

  get (category, last) {
    if (!(category in this.container)) {
      // return {type:null, name:null};
      logger.traceback()
      throw new Error(`${category} is not available.`)
    }
    if (last) {
      return this.container[category].slice(-1)[0]
    }
    return random.pick(this.container[category])
  }

  pick (category, last) {
    try {
      return this.get(category, last).name
    } catch (e) {
      logger.traceback()
      throw logger.JSError(`Error: pick('${category}') is undefined.`)
    }
  }

  pop (objectName) {
    let self = this
    Object.keys(this.container).forEach(function (category) {
      self.container[category].forEach(function (obj) {
        if (obj.name === objectName) {
          self.container[category].splice(self.container[category].indexOf(obj), 1)
        }
      })
    })
  }

  contains (categoryNames) {
    let categories = []
    let self = this
    categoryNames.forEach(function (name) {
      if (self.has(name)) {
        categories.push(name)
      }
    })
    return (categories.length === 0) ? null : categories
  }

  show (category) {
    return (category in this.container) ? this.container[category] : this.container
  }

  count (category) {
    return (category in this.container) ? this.container[category].length : 0
  }

  has (category) {
    if (category in this.container) {
      this.check(category)
      return this.container[category].length > 0
    }
    return false
  }

  valid () {
    let items = []
    let self = this
    Object.keys(self.container).forEach(function (category) {
      self.check(category)
    })
    Object.keys(self.container).forEach(function (category) {
      for (let i = 0; i < self.container[category].length; i++) {
        items.push(self.container[category][i].name)
      }
    })
    return items
  }

  check (category) {
    let self = this
    self.container[category].forEach(function (object) {
      try {
        let x = /* frame.contentWindow. */ eval(object.name) // eslint-disable-line no-eval
        if (x === undefined || x === null) {
          self.pop(object.name)
        }
      } catch (e) {
        self.pop(object.name)
      }
    })
  }
}

module.exports = {
  o,
  Objects
}