<template>
    <div class="component-upload-image">
        <el-upload multiple :action="imageUpload" list-type="picture-card" :on-success="handleUploadSuccess"
            :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed"
            name="file" :drag="true" :data="data" :disabled="isDisabled" :on-remove="handleRemove"
            :show-file-list="true" :headers="headers" :file-list="fileList" :on-preview="handlePictureCardPreview"
            :style="style" :class="{ hide: fileList.length >= limit || isDisabled }">
            <el-icon class="avatar-uploader-icon">
                +
            </el-icon>
        </el-upload>
        <!-- 上传提示 -->
        <div class="el-upload__tip" v-if="showTip">
            请上传
            <template v-if="fileSize">
                大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
            </template>
            <template v-if="fileType">
                格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b>
            </template>
            的文件
        </div>

        <el-dialog v-model="dialogVisible" title="预览" width="800px" append-to-body>
            <template v-if="isImage(dialogImageUrl)">
                <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
            </template>
            <template v-else-if="isVideo(dialogImageUrl)">
                <video :src="dialogImageUrl" controls autoplay
                    style="display: block; max-width: 100%; height: 500px; margin: 0 auto"></video>
            </template>
        </el-dialog>
    </div>
</template>

<script setup>
import { ref, reactive, watch, computed } from "vue";
// import { useLoginStore } from "~/store";
// import { imageUpload } from "~/service/common";



const props = defineProps({
    modelValue: [String, Object, Array],
    // 图片数量限制
    limit: {
        type: Number,
        default: 5,
    },
    // 大小限制(MB)
    fileSize: {
        type: Number,
        default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
        type: Array,
        default: () => ['png', 'jpg', 'jpeg'],
    },
    // 是否显示提示
    isShowTip: {
        type: Boolean,
        default: true,
    },
    // 是否禁用
    isDisabled: {
        type: Boolean,
        default: false,
    },
    // 上传携带的参数
    data: {
        type: Object,
    },
})

// const store = useLoginStore();
const headers = {
    Accept: "application/json",
    // ...store.headers,
};

const emit = defineEmits()
const number = ref(0)
const uploadList = ref([])
const dialogImageUrl = ref('')
const dialogVisible = ref(false)
const fileList = ref([])
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize))

watch(
    () => props.modelValue,
    (val) => {
        if (val) {
            // 首先将值转为数组
            const list = Array.isArray(val) ? val : props.modelValue.split(',')
            // 然后将数组转为对象数组
            fileList.value = list.map((item) => {
                if (typeof item === 'string') {
                    // if (item.indexOf(baseUrl) === -1) {
                    //   item = { name: baseUrl + item, url: baseUrl + item }
                    // } else {
                    item = { name: item, url: item }
                    // }
                }
                return item
            })
        } else {
            fileList.value = []
            return []
        }
    },
    { deep: true, immediate: true },
)

// 删除图片
function handleRemove(file, files) {
    emit('update:modelValue', listToString(fileList.value))
}

const imageUpload = function(){
    
}

// 上传成功回调
function handleUploadSuccess(res) {
    if (res.code != 0) {
        ElMessage.error(`上传失败，原因:${res.msg}!`);
        fileList.value = fileList.value.slice(0, fileList.value.length - 1)
        return
    }
    uploadList.value.push({ name: res.data.fileName, url: res.data.url })
    if (uploadList.value.length === number.value) {
        fileList.value = fileList.value.filter((f) => f.url !== undefined).concat(uploadList.value)
        uploadList.value = []
        number.value = 0
        emit('update:modelValue', listToString(fileList.value))
    }
    updateVideoDom()

}

function updateVideoDom() {
    setTimeout(() => {
        Array.prototype.slice.call(document.getElementsByClassName('is-success'))
            .filter(item => item.className.indexOf('el-upload-list__item') !== -1)
            .map(item => {
                let tag = item.getElementsByClassName('el-upload-list__item-thumbnail')[0];
                if (isVideo(tag.getAttribute('src'))) {
                    let attr = [tag.getAttribute('class'), tag.getAttribute('src')];
                    let videoTag = document.createElement('video');
                    videoTag.setAttribute('class', attr[0]);
                    videoTag.setAttribute('src', attr[1]);
                    item.replaceChild(videoTag, tag);
                }
            });
    },)
}

// 上传前loading加载
function handleBeforeUpload(file) {
    let isImg = false
    if (props.fileType.length) {
        let fileExtension = ''
        if (file.name.lastIndexOf('.') > -1) {
            fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
        }
        isImg = props.fileType.some((type) => {
            if (file.type.indexOf(type) > -1) return true
            if (fileExtension && fileExtension.indexOf(type) > -1) return true
            return false
        })
    } else {
        isImg = file.type.indexOf('image') > -1
    }
    if (!isImg) {
        ElMessage.error(`文件格式不正确, 请上传${props.fileType.join('/')}图片格式文件!`);
        return false
    }
    if (props.fileSize) {
        const isLt = file.size / 1024 / 1024 < props.fileSize
        if (!isLt) {
            ElMessage.error(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
            return false
        }
    }
    number.value++
}

// 文件个数超出
function handleExceed() {
    ElMessage.error(`上传文件数量不能超过 ${props.limit} 个!`)
}

// 上传失败
function handleUploadError() {
    ElMessage.error('上传图片失败')
}

// 预览
function handlePictureCardPreview(file) {
    dialogImageUrl.value = file.url
    dialogVisible.value = true
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
    let strs = ''
    separator = separator || ','
    for (let i in list) {
        if (undefined !== list[i].url && list[i].url.indexOf('blob:') !== 0) {
            strs += list[i].url + separator
        }
    }
    return strs != '' ? strs.substr(0, strs.length - 1) : ''
}

const getFileExtension = (filename) => {
    return filename.slice(filename.lastIndexOf('.'));
};

const isImage = (value) => {
    const imageExtensions = ['.png', '.jpg', '.jpeg'];
    const extension = getFileExtension(value);
    return imageExtensions.includes(extension.toLowerCase());
};

const isVideo = (value) => {
    const videoExtensions = ['.mp4', '.avi', '.mov', '.wmv', '.flv', '.mkv', '.mpeg', '.3gp', '.webm', '.vob', '.rm', '.rmvb'];
    const extension = getFileExtension(value);
    return videoExtensions.includes(extension.toLowerCase());
};


</script>

<style scoped>
:deep(.hide .el-upload--picture-card) {
    display: none !important;
}

:deep(.el-upload-dragger) {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}
</style>