/*
 * Tencent is pleased to support the open source community by making vap available.
 *
 * Copyright (C) 2020 THL A29 Limited, a Tencent company.  All rights reserved.
 *
 * Licensed under the MIT License (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 *
 * http://opensource.org/licenses/MIT
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language governing permissions and
 * limitations under the License.
 */
export default class VapVideo {
    constructor(options) {
        if (!options.container || !options.src) {
            return console.warn('[Alpha video]: options container and src cannot be empty!')
        }
        this.options = Object.assign(
            {
                // 视频url
                src: '',
                // 循环播放
                loop: false,
                fps: 20,
                // 视频宽度
                width: 375,
                // 视频高度
                height: 375,
                // 容器
                container: null,
                config: ''
            },
            options
        )
        this.fps = 20
        this.requestAnim = this.requestAnimFunc(this.fps)
        this.container = this.options.container
        if (!this.options.src || !this.options.config || !this.options.container) {
            console.error('参数出错：src(视频地址)、config(配置文件地址)、container(dom容器)')
        } else {
            // 创建video
            this.initVideo()
        }
    }

    initVideo() {
        const options = this.options
        // 创建video
        const video = (this.video = document.createElement('video'))
        video.crossOrigin = 'anonymous'
        video.autoplay = false
        video.preload = 'auto'
        video.autoload = true
        // video.muted = true
        // video.volume = 0
        video.style.display = 'none'
        video.src = options.src
        video.loop = !!options.loop
        // 这里要插在body上，避免container移动带来无法播放的问题
        document.body.appendChild(this.video)
        // 绑定事件
        this.events = {}
        ;['playing', 'pause', 'ended', 'error'].forEach(item => {
            this.on(item, this['on' + item].bind(this))
        })
        video.load()
    }
    drawFrame() {
        this._drawFrame = this._drawFrame || this.drawFrame.bind(this)
        this.animId = this.requestAnim(this._drawFrame)
    }

    play() {
        const prom = this.video && this.video.play()

        if (prom && prom.then) {
            prom.catch(e => {
                if (!this.video) {
                    return
                }
                this.video.muted = true
                this.video.volume = 0
                this.video.play().catch(e => {
                    ;(this.events.error || []).forEach(item => {
                        item(e)
                    })
                })
            })
        }
    }

    requestAnimFunc() {
        const me = this
        if (window.requestAnimationFrame) {
            let index = -1
            return function(cb) {
                index++
                return requestAnimationFrame(() => {
                    if (!(index % (60 / me.fps))) {
                        return cb()
                    }
                    me.animId = me.requestAnim(cb)
                })
            }
        }
        return function(cb) {
            return setTimeout(cb, 1000 / me.fps)
        }
    }

    cancelRequestAnimation() {
        if (window.cancelAnimationFrame) {
            cancelAnimationFrame(this.animId)
        }
        clearTimeout(this.animId)
    }

    destroy() {
        if (this.video) {
            this.video.parentNode && this.video.parentNode.removeChild(this.video)
            this.video = null
        }
        this.cancelRequestAnimation(this.animId)
    }

    clear() {
        this.destroy()
    }

    on(event, callback) {
        const cbs = this.events[event] || []
        cbs.push(callback)
        this.events[event] = cbs
        this.video.addEventListener(event, callback)
        return this
    }

    onplaying() {
        if (!this.firstPlaying) {
            this.firstPlaying = true
            this.drawFrame()
        }
    }

    onpause() {}

    onended() {
        this.destroy()
    }

    onerror(err) {
        console.error('[Alpha video]: play error: ', err)
        this.destroy()
    }
}