/**
 * {注入的js}
 * @author yutent<yutent.io@gmail.com>
 * @date 2023/07/21 17:38:11
 */
const MIME_TYPES = {
  html: 'text/html',
  json: 'application/json',
  js: 'application/javascript',
  htm: 'text/html',
  txt: 'text/plain',
  css: 'text/css',
  webp: 'image/webp',
  jpg: 'image/jpg',
  jpeg: 'image/jpeg',
  png: 'image/png',
  gif: 'image/gif',
  svg: 'image/svg+xml',
  ico: 'image/ico',
  mp3: 'audio/mpeg',
  ogg: 'audio/ogg',
  m4a: 'audio/m4a',
  amr: 'audio/amr',
  mp4: 'video/mp4',
  webm: 'video/webm',
  wasm: 'application/wasm',
  asm: 'application/asm',
  zip: 'application/zip',
  '7z': 'application/x-7z-compressed',
  eot: 'application/vnd.ms-fontobject',
  ttf: 'font/ttf',
  otf: 'font/otf',
  woff: 'font/woff',
  woff2: 'font/woff2',
  xls: 'application/vnd.ms-excel',
  doc: 'application/msword',
  xlsx: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
  docx: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
}
const KEYS_MAP = {
  shift: '<Shift>',
  ctrl: '<Ctrl>',
  alt: '<Alt>',
  super: '<Super>'
}

function defer() {
  let obj = {}
  obj.promise = new Promise((resolve, reject) => {
    obj.resolve = resolve
    obj.reject = reject
  })
  return obj
}

function rand(prefix = 'cb_') {
  return prefix + Math.random().toString().slice(2)
}

function handler(event, data = {}, once = true) {
  let _ = defer()
  let callback

  if (typeof once === 'boolean') {
    callback = rand()
    native[once ? '$once' : '$on'](callback, _.resolve)
  } else {
    _.resolve(true)
  }
  window.webkit.messageHandlers.app.postMessage({
    event,
    data,
    callback
  })
  return _.promise
}

function base64(str = '') {
  return btoa(str).replace(/[+=\/]/g, '')
}

class NativeImage {
  #origin

  constructor(obj) {
    this.#origin = obj
    this.width = obj.width
    this.height = obj.height
    this.type = MIME_TYPES[obj.filepath.split('.').pop()]
  }

  toJSON() {
    return this.#origin
  }

  export(type, base64) {
    let _ = defer()
    let canvas = document.createElement('canvas')
    canvas.width = this.width
    canvas.height = this.height
    let ctx = canvas.getContext('2d')
    let imgData = ctx.getImageData(0, 0, this.width, this.height)
    let data = imgData.data

    for (let i = 0; i < this.#origin.bytes.length; i += 4) {
      imgData.data[i] = this.#origin.bytes[i]
      imgData.data[i + 1] = this.#origin.bytes[i + 1]
      imgData.data[i + 2] = this.#origin.bytes[i + 2]
      imgData.data[i + 3] = this.#origin.bytes[i + 3]
    }

    ctx.putImageData(imgData, 0, 0)

    if (base64) {
      return canvas.toDataURL(type || this.type, 1)
    } else {
      canvas.toBlob(_.resolve, type || this.type, 1)
      return _.promise
    }
  }

  toPNG() {
    return this.export('image/png')
  }

  toJPEG() {
    return this.export('image/jpeg')
  }

  toDataURL(type) {
    return this.export(type, true)
  }
}

class EventEmitter {
  //
  __events__ = Object.create(null)

  $on(name, fn) {
    if (this.__events__[name]) {
      this.__events__[name].push(fn)
    } else {
      this.__events__[name] = [fn]
    }
  }

  $once(name, fn) {
    fn.__once__ = true
    this.$on(name, fn)
  }

  $off(name, fn) {
    if (this.__events__[name]) {
      if (fn) {
        this.__events__[name] = this.__events__[name].filter(it => it !== fn)
      } else {
        this.__events__[name] = []
      }
    }
  }

  $emit(name, ...args) {
    if (this.__events__[name]) {
      for (let fn of this.__events__[name]) {
        try {
          fn.apply(this, args)
          if (fn.__once__) {
            this.$off(name, fn)
          }
        } catch (e) {
          console.error(e)
        }
      }
    }
  }

  $destroy() {
    this.__events__ = Object.create(null)
  }
}

window.native = new EventEmitter()

Object.assign(native, {
  quit() {
    return handler('quit', {}, null)
  },
  fs: {
    read(filepath) {
      return handler('fs', { action: 'read', filepath })
    },
    write(filepath, content = '', append = false) {
      return handler('fs', {
        action: 'write',
        filepath,
        content,
        append
      })
    },
    exists(filepath) {
      return handler('fs', { action: 'exists', filepath })
    },
    isfile(filepath) {
      return handler('fs', { action: 'isfile', filepath })
    },
    isdir(filepath) {
      return handler('fs', { action: 'isdir', filepath })
    },
    remove(filepath) {
      return handler('fs', { action: 'remove', filepath })
    },
    rename(filepath, target) {
      return handler('fs', { action: 'rename', filepath, target })
    },
    copy(filepath, target) {
      return handler('fs', { action: 'copy', filepath, target })
    }
  },
  image(filepath) {
    return handler('image', { value: filepath }).then(r => new NativeImage(r))
  },
  clipboard: {
    readText() {
      return handler('clipboard', { action: 'wait_for_text' })
    },
    writeText(value) {
      return handler('clipboard', { action: 'set_text', value }, null)
    },
    readImage() {
      return handler('clipboard', { action: 'wait_for_image' }).then(r =>
        r ? new NativeImage(r) : r
      )
    },
    writeImage(value) {
      // 暂不知原因, postMessage传给Gtk后, JSON.stringify()并未读取toJSON的结果
      if (typeof value === 'object') {
        value = value.toJSON()
      }
      return handler('clipboard', { action: 'set_image', value }, null)
    },
    clear() {
      return handler('clipboard', { action: 'clear' })
    }
  },
  screen: {
    getAllDisplays() {
      return handler('monitor', { action: 'get-all' })
    },
    getPrimaryDisplay() {
      return handler('monitor', { action: 'get-primary' })
    }
  },
  globalShortcut: {
    get enabled() {
      return handler('keybinder', { action: 'supported' })
    },
    register(keyMap, callback) {
      let shortcut_callback = base64(keyMap)
      native.$off(shortcut_callback)
      native.$on(shortcut_callback, callback)
      return handler('keybinder', {
        action: 'register',
        value: keyMap,
        shortcut_callback
      })
    },
    unregister(keyMap) {
      let shortcut_callback = base64(keyMap)
      native.$off(shortcut_callback)
      return handler('keybinder', { action: 'unregister', value: keyMap })
    },
    unregisterAll(keyMaps) {
      for (let it of keyMaps) {
        this.unregister(it)
      }
    }
  },
  tray: {
    create() {
      //
    },
    remove() {
      //
    },

    /**
     * 设置普通状态的tray图标, 只需要传名称, 自动会去当前主题下去找
     */
    set_icon(name) {
      return handler('tray', { action: 'set_icon', value: name })
    },

    /**
     * 设置警示图标, 同上
     */
    set_attention_icon(name) {
      return handler('tray', { action: 'set_attention_icon', value: name })
    },

    /**
     *
     */
    set_title(title) {
      return handler('tray', { action: 'set_title', value: title })
    },

    /**
     * 修改tray图标状态
     * @param status <Number>  0: 隐藏, 1: 显示, 2: 重要(对应上面的attention_icon)
     */
    set_status(status) {
      return handler('tray', { action: 'set_status', value: status })
    }
  },
  window: {
    isVisible() {
      return handler('window', { action: 'is_visible' })
    },
    toggleVisible() {
      handler('window', { action: 'toggle_visible' }, null)
    },
    hide() {
      handler('window', { action: 'hide' }, null)
    },
    show() {
      handler('window', { action: 'show' }, null)
    },
    fullscreen() {
      handler('window', { action: 'fullscreen' }, null)
    },
    unfullscreen() {
      handler('window', { action: 'unfullscreen' }, null)
    },
    maximize() {
      handler('window', { action: 'maximize' }, null)
    },
    unmaximize() {
      handler('window', { action: 'unmaximize' }, null)
    },
    setTitle(title = '') {
      handler('window', { action: 'set_title', value: title }, null)
    },
    resize(width = 0, height = 0) {
      handler('window', { action: 'resize', value: { width, height } }, null)
    },
    move(x = 0, y = 0) {
      handler('window', { action: 'resize', value: { x, y } }, null)
    },
    setOpacity(opacity = 1) {
      handler('window', { action: 'set_opacity', value: opacity }, null)
    },
    alwayOnTop(setting = true) {
      handler('window', { action: 'set_keep_above', value: setting }, null)
    },
    alwayOnBotttom(setting = true) {
      handler('window', { action: 'set_keep_below', value: setting }, null)
    }
  },
  handler
})