<template>
    <div class="wrap pb">
        <breadcrumb ref="breadcrumb" :data="'课程学习/' + courseName"></breadcrumb>
        <div class="flex">
            <div class="cover" :class="{'is-word': showMask1}">
                <img v-if="coverUrl" :src="coverUrl" alt="" width="100%" height="100%">
                <template v-else-if="iframeSrc">
                    <iframe class="inner fileIframe" id="fileIframe" :src="iframeSrc" frameborder="0"></iframe>
                    <template v-if="showMask">
                        <div class="mask" style="width: 500px;height: 30px;top: 53px;right: 320px"></div>
                        <div class="mask" style="width: 175px;height: 30px;top: 53px;right: 5px"></div>
                    </template>
                    <template v-if="showMask1">
                        <div class="word-mask" style="height: 40px;"></div>
                        <div class="word-mask2" style="top: 55px;left: 28%;width: 44%;height: calc(100% - 80px);"></div>
                    </template>
                    <template v-if="showMask2">
                        <div class="excel-mask1" style="height: 48px;"></div>
                    </template>
                </template>
                <div class="pdf inner" v-else-if="pdfSrc">
                    <p class="arrow">
                        <span @click="changePdfPage(0)" class="turn el-icon-arrow-left" :class="{grey: currentPage==1}"></span>
                        {{currentPage}} / {{pageCount}}
                        <span @click="changePdfPage(1)" class="turn el-icon-arrow-right" :class="{grey: currentPage==pageCount}"></span>
                    </p>
                    <pdf
                        class="pdf-wrap"
                        :src="pdfSrc"
                        :page="currentPage"
                        @num-pages="pageCount=$event"
                        @page-loaded="currentPage=$event"
                        @loaded="loadPdfHandler">
                    </pdf>
                </div>
                <div class="inner" v-else-if="playAuth">
                    <div class="video_wid" id="player"></div>
                </div>
            </div>
            <div class="catalog">
                <div class="list">
                    <h4 class="title">{{courseName}}</h4>
                    <div class="desc-wrap">
                        <div class="desc" :class="{active: desShrink}" v-html="description"></div>
                        <i class="arrow" :class="{active: desShrink}" v-if="description && description.length > 40">
                            <span>...</span>
                            <img src="@/assets/img/arrow-down.png" alt="" @click="desShrink = !desShrink">
                        </i>
                    </div>
                    <div class="chapters">
                        <template v-if="videoList && videoList.length">
                            <div class="chapter" v-for="(item,index) in videoList" :key="index">
                                <div class="chapterName">{{item.name}}</div>
                                <div class="section" v-if="item.subsectionList.length">
                                    <div v-for="(section,i) in item.subsectionList" :key="i" @click="preview(section, item.name)">
                                        <p class="sectionName" :class="{active: curLink === `${item.name}${section.name}`}">{{ section.name }}</p>
                                    </div>
                                </div>
                            </div>
                        </template>
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
import { mapState } from 'vuex';
import pdf from "vue-pdf";
import 'quill/dist/quill.core.css';
import 'quill/dist/quill.snow.css';
import 'quill/dist/quill.bubble.css';
import bus from '@/libs/bus'
import breadcrumb from '@/components/breadcrumb'
export default {
    data() {
        return {
            id: this.$route.query.id,
            video: 'http://liuwanr.oss-cn-shenzhen.aliyuncs.com/mp4/20200519/1589871025648.mp4',
            videoList: [],
            courseName: '',
            description: '',
            coverUrl: '',
            playAuth: '',
            player: null,
            previewImg: '',
            iframeSrc: '',
            isWord: false,
            isPPT: false,
            isExcel: false,
            showMask: false,
            showMask1: false,
            showMask2: false,
            closePosi: {
                top: '80px'
            },
            pdfVisible: false,
            pdfSrc: '',
            currentPage: 0, // pdf文件页码
            pageCount: 0, // pdf文件总页数
            fileType: 'pdf', // 文件类型
            desShrink: false,
            curLink: "", // 当前选中
        };
    },
    computed: {
        ...mapState({
            courseId: state => state.courseId,
            classId: state => state.classId,
        }),
    },
    components: { pdf, breadcrumb },
    mounted() {
        bus.$emit('setBg','none')
        this.insertScript()
        this.getData()
        this.getChapter()
    },
    methods: {
        async getData(){
            let res = await this.$get(`${this.api.getCourseById}/${this.id}`)
            this.courseName = res.course.name
            this.description = res.course.description
            this.coverUrl = res.course.coverUrl || 'https://huoran.oss-cn-shenzhen.aliyuncs.com/20220224/png/1496735335294984192.png'
            this.$refs.breadcrumb.update('课程学习/' + this.courseName)
        },
        async getChapter(){
            let res = await this.$get(`${this.api.queryChaptersAndSubsections}/${this.id}`)
            this.videoList = res.chapterList
        },
        insertScript(){
            const linkTag = document.createElement('link');
            linkTag.rel = 'stylesheet';
            linkTag.href = 'https://g.alicdn.com/de/prismplayer/2.8.2/skins/default/aliplayer-min.css';
            document.body.appendChild(linkTag);

            const scriptTag = document.createElement('script');
            scriptTag.type = 'text/javascript';
            scriptTag.src = 'https://g.alicdn.com/de/prismplayer/2.8.2/aliplayer-min.js';
            document.body.appendChild(scriptTag);
        },
        transferType(ext){
            if('jpg,jpeg,png,gif,svg,psd'.includes(ext)) return '图片'
            if('mp4,3gp,mov,m4v,avi,dat,mkv,flv,vob,rmvb,rm,qlv'.includes(ext)) return '视频'
            return ext
        },
        preview(row, chapterName){
            this.curLink = `${chapterName}${row.name}`;
            this.player = null
            this.playauth = ''
            this.coverUrl = ''
            this.pdfSrc = ''
            this.iframeSrc = ''
            this.isPPT = false
            this.isWord = false
            this.isExcel = false
            if(this.transferType(row.fileType) == '视频'){
                this.$get(`${this.api.getPlayAuth}/${row.fileId}`).then(res => {
                    this.playAuth = res.data.playAuth
                    this.$nextTick(() => {
                        if(this.player){
                            this.player.replayByVidAndPlayAuth(row.fileId,this.playAuth)
                        }else{
                            this.player = new Aliplayer({
                                id: 'player',
                                width: '100%',
                                autoplay: false,
                                vid : row.fileId,
                                playauth : this.playAuth,
                                encryptType:1, //当播放私有加密流时需要设置。
                            })
                        }
                    })

                }).catch(res => {})
            }else if(this.transferType(row.fileType) == '图片'){
                this.coverUrl = row.fileUrl
            }else if(row.fileType == 'pdf'){
                this.pdfSrc = row.fileUrl
                this.pdfVisible = true
            }else{
                this.$get(`${this.api.getSubsection}/${row.id}`).then(res => {
                    if(row.fileType == 'pptx'){
                        this.isPPT = true
                        this.isWord = false
                        this.isExcel = false
                    }else if(row.fileType == 'doc' || row.fileType == 'docx'){
                        this.isPPT = false
                        this.isWord = true
                        this.isExcel = false
                    }else if(row.fileType == 'xls' || row.fileType == 'xlsx'){
                        this.isExcel = true
                        this.isPPT = false
                        this.isWord = false
                    }else{
                        this.isPPT = false
                        this.isWord = false
                        this.isExcel = false
                    }
                    if(this.isPPT){
                        this.showMask = true
                    }else{
                        this.showMask = false
                    }
                    if(this.isWord){
                        this.showMask1 = true
                    }else{
                        this.showMask1 = false
                    }
                    if(this.isExcel){
                        this.showMask2 = true
                    }else{
                        this.showMask2 = false
                    }
                    this.iframeSrc = res.previewUrl
                })
                    .catch(err => {
                    });
            }
        },
        closePlayer(){
            this.playAuth = ''
            this.player.pause()
        },
        closeIframe(){
            this.iframeSrc = ''
            this.showMask = false
            this.showMask1 = false
        },
        closePdf(){
            this.pdfSrc = ''
            this.currentPage = 1
        },
        changePdfPage (val) {
            if (val === 0 && this.currentPage > 1) {
                this.currentPage--
            }
            if (val === 1 && this.currentPage < this.pageCount) {
                this.currentPage++
            }
        },
        loadPdfHandler (e) {
            this.currentPage = 1
        }
    }
};
</script>
<style>
.desc img {
    width: 100%;
}
</style>
<style lang="scss" scoped>
$height: 700px;
.video_wid,.cover{
    position: relative;
    width: 76%;
    max-width: 1400px;
    height: $height !important;
    border: 0;
}
.page {
    margin: 12px 0;
    .intro {
        font-size: 16px;
        color: #333;
        line-height: 24px;
    }
}
.cover{
    flex: 1;
    &.is-word{
        overflow: hidden;
    }
}
.fileIframe{
    height: $height !important;
}
.video_wid,.inner{
    width: 100%;
    height: 100% !important;
    border: 0;
    overflow: auto;
}
.cover.is-word{
    .inner{
        height: calc(100% + 38px) !important;
        margin-top: -38px;
    }
}
.video_wid:focus{
    outline: none;
}
.catalog{
    width: 296px;
    padding: 16px;
    margin-left: 12px;
    background-color: #252528;
    .entry {
        width: 100%;
        padding: 10px 15px;
        margin-bottom: 16px;
    }
}
.list{
    height: calc(700px - 82px) ;
    overflow-y: auto;
    .title{
        margin-bottom: 11px;
        color: #fff;
        font-size: 16px;
    }
    .desc-wrap{
        position: relative;
        .desc{
            font-size: 14px;
            color: #fff;
            line-height: 22px;
            @include mul-ellipsis(2);
            &.active{
                display: block;
                overflow: visible;
            }
        }
        .arrow{
            position: absolute;
            bottom: 2px;
            right: 0;
            display: flex;
            justify-content: space-between;
            width: 46px;
            background-color: #fff;
            span{
                font-size: 14px;
                color: rgba(0, 0, 0, 0.65);
            }
            img{
                width: 16px;
                cursor: pointer;
            }
            &.active{
                span{
                    opacity: 0;
                }
                img{
                    transform: rotate(180deg);
                }
            }
        }
    }
    .chapters{
        margin-top: 16px;
        max-height: calc(100% - 53px);
        overflow: auto;
    }
    .chapter{
        margin-bottom: 20px;
        .chapterName{
            color: #fff;
            font-size: 14px;
        }
        .section{
            padding: 5px 15px;
            margin-top: 12px;
            background-color: #121214;
            .sectionName{
                margin: 12px 0;
                font-size: 14px;
                color: #999;
                cursor: pointer;
                @include ellipsis;
                img {
                    margin-right: 8px;
                }
                &.active{
                    color: #fff;
                }
            }
        }
    }
}
.el-image-viewer__wrapper{
    transform: translateY(-10px);
    transition: transform .5s;

    &.active{
        transform: translateY(0)
    }
}
.el-image-viewer__close{
    z-index: 2000;
    top: 15px;
    right: 15px;
    &.doc-close{
        i{
            color: #000 !important;
        }
    }
}
.list::-webkit-scrollbar {
    width: 4px;
}
.list::-webkit-scrollbar-thumb {
    border-radius: 10px;
    background: rgba(0, 0, 0, 0.06);
}

.mask{
    z-index: 9;
    position: absolute;
    background-color: rgb(57,58,61);
}
.word-mask{
    z-index: 9;
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    background-color: rgb(243,242,241);
}
.word-mask1{
    z-index: 9;
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    background-color: #185abd;
}
.word-mask2{
    z-index: 9;
    position: absolute;
    background-color: transparent;
}
.excel-mask1{
    z-index: 9;
    position: absolute;
    top: 0;
    left: 20%;
    width: 60%;
    background-color: #107c41;
}
/deep/.pdf-dia{
    border-radius: 0 !important;
    .el-dialog__header{
        display: none;
    }
    .el-dialog__body{
        padding: 0;
    }
    .el-dialog__headerbtn{
        top: 10px;
        .el-dialog__close{
            color: #fff;
            font-size: 16px;
        }
    }
}
.pdf{
    .arrow{
        padding: 10px 0;
        display: flex;
        justify-content: center;
        align-items: center;
        font-size: 16px;
        color: #fff;
        background-color: #333;
        .turn{
            margin: 0 10px;
            font-size: 18px;
            cursor: pointer;
        }
    }
    .pdf-wrap{
        width: 80%;
        margin: 0 auto;
    }
}
@media (max-width: 1430px) {
    .wrap {
        padding: 12px 100px 20px;
    }
}
</style>