<template>
  <div class="component-upload-image">
    <el-upload
      multiple
      :action="uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      ref="imageUpload"
      :before-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: fileList.length >= limit }"
    >
      <el-icon class="avatar-uploader-icon"><plus /></el-icon>
    </el-upload>
    <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>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
    </el-dialog>
  </div>
</template>

<script setup>
import { getToken } from "@/utils/auth";

const props = defineProps({
  modelValue: [String, Object, Array],
  limit: { type: Number, default: 5 },
  fileSize: { type: Number, default: 5 },
  fileType: { type: Array, default: () => ["png", "jpg", "jpeg"] },
  isShowTip: { type: Boolean, default: true },
  uploadUrl: { type: String, default: "" }
});

const { proxy } = getCurrentInstance();
const emit = defineEmits(["update:modelValue"]);
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(props.uploadUrl || baseUrl + "/common/upload");
const headers = ref({ Authorization: "Bearer " + getToken() });
const fileList = ref([]);
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize));

watch(() => props.modelValue, val => {
  if (val && (Array.isArray(val) || typeof val === "object" || String(val).trim())) {
    const list = Array.isArray(val)
      ? val
      : typeof val === "string"
        ? val.split(",")
        : [val];
    fileList.value = list.map(item => {
      const source = typeof item === "string" ? item : (item.url || item.fileName || item.name);
      const url = normalizeImageUrl(source);
      return typeof item === "object"
        ? { ...item, name: item.name || source || url, url, status: item.status || "success" }
        : { name: source || url, url, status: "success" };
    }).filter(item => item.url);
  } else {
    fileList.value = [];
  }
}, { deep: true, immediate: true });

function normalizeImageUrl(value) {
  const url = String(value || "").trim();
  if (!url || /^(https?:|blob:|data:)/.test(url)) return url;
  if (baseUrl && (url === baseUrl || url.startsWith(baseUrl + "/"))) return url;
  return url.startsWith("/") ? baseUrl + url : baseUrl + "/" + url;
}

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 => file.type.indexOf(type) > -1 || fileExtension.indexOf(type) > -1);
  } else {
    isImg = file.type.indexOf("image") > -1;
  }
  if (!isImg) {
    proxy.$modal.msgError(`文件格式不正确，请上传${props.fileType.join("/")}图片格式文件!`);
    return false;
  }
  if (props.fileSize && file.size / 1024 / 1024 >= props.fileSize) {
    proxy.$modal.msgError(`上传图片大小不能超过 ${props.fileSize} MB!`);
    return false;
  }
  proxy.$modal.loading("正在上传图片，请稍候...");
  number.value++;
}

function handleExceed() {
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

function handleUploadSuccess(res, file) {
  if (res.code === 200) {
    const storedUrl = uploadImgUrl.value.includes("/minio/")
      ? (res.url || res.fileName)
      : (res.fileName || res.url);
    uploadList.value.push({
      name: res.originalFilename || storedUrl,
      url: normalizeImageUrl(storedUrl),
      status: "success",
      uid: file.uid
    });
    uploadedSuccessfully();
  } else {
    number.value--;
    proxy.$modal.closeLoading();
    proxy.$modal.msgError(res.msg);
    proxy.$refs.imageUpload.handleRemove(file);
    uploadedSuccessfully();
  }
}

function handleDelete(file) {
  const findex = fileList.value.findIndex(f =>
    (file.uid && f.uid === file.uid) || f.url === file.url || f.name === file.name
  );
  if (findex > -1 && uploadList.value.length === number.value) {
    fileList.value.splice(findex, 1);
    emit("update:modelValue", listToString(fileList.value));
    return false;
  }
}

function uploadedSuccessfully() {
  if (number.value > 0 && 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));
    proxy.$modal.closeLoading();
  }
}

function handleUploadError() {
  proxy.$modal.msgError("上传图片失败");
  proxy.$modal.closeLoading();
}

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

function listToString(list, separator = ",") {
  return list
    .filter(item => item.url && !item.url.startsWith("blob:"))
    .map(item => {
      const url = item.url;
      return baseUrl && url.startsWith(baseUrl) ? url.slice(baseUrl.length) : url;
    })
    .join(separator);
}
</script>

<style scoped lang="scss">
:deep(.hide .el-upload--picture-card) {
  display: none;
}
</style>
