// @/API/admin.ts
import { api8000 } from '@/utils/request';
import { ElMessage } from 'element-plus';
import 'element-plus/es/components/message/style/css';

// 🔹 获取表格数据
export const table = (params: { table: string }) => {
  return api8000({
    url: "/admin/table",
    method: "GET",
    params: params,
  })
    .then((res) => {
      // 适配后端返回的直接数组格式
      return { data: Array.isArray(res.data) ? res.data : [] };
    })
    .catch((err) => {
      if (err.response?.status === 401) throw err;
      throw new Error(err.message || "获取数据失败");
    });
};

// 🔹 新增数据
export const addItem = (data: {
  table: string;
  item: Record<string, any>;
}) => {
  return api8000({
    url: "/admin/add_item",
    method: "POST",
    params: { table: data.table },
    data: data.item,
  }).catch((error) => {
    if (error.response?.status === 400 && error.response.data.detail === "重复数据") {
      ElMessage.error("数据重复，请重新添加");
    }
    throw error;
  });
};

// 🔹 更新数据
export const updateItem = (data: {
  table: string;
  id: number;
  update_data: Record<string, any>;
}) => {
  return api8000({
    url: "/admin/update_item",
    method: "PUT",
    params: { table: data.table, id: data.id },
    data: data.update_data,
  }).catch((error) => {
    if (error.response?.status === 400 && error.response.data.detail === "重复数据") {
      ElMessage.error("数据重复，无法更新");
    }
    throw error;
  });
};

// 🔹 删除数据
export const deleteItemApi = (params: {
  table: string;
  id: number;
}) => {
  return api8000({
    url: "/admin/delete_item",
    method: "DELETE",
    params: params,
  });
};

// 🔹 导出数据
export const exportData = (table: string, format: string = "xlsx") => {
  return api8000({
    url: "/admin/export_data",
    method: "GET",
    params: { table, fmt: format },
    responseType: "blob",
  })
    .then((response) => {
      const contentDisposition = response.headers["content-disposition"];
      if (!contentDisposition) {
        throw new Error("无法获取文件名");
      }
      const filenameMatch = contentDisposition.match(/filename=([^;]+)/);
      const filename = filenameMatch ? decodeURIComponent(filenameMatch[1]) : `${table}_data.${format === "xlsx" ? "xlsx" : "csv"}`;

      const blob = new Blob([response.data], {
        type: format === "xlsx"
          ? "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
          : "text/csv",
      });
      const url = window.URL.createObjectURL(blob);
      const link = document.createElement("a");
      link.href = url;
      link.download = filename;
      link.click();
      window.URL.revokeObjectURL(url);
    })
    .catch((error) => {
      console.error("❌ 导出数据失败:", error);
      throw error;
    });
};

// 🔹 导入数据
export const importData = (table: string, file: File) => {
  // 1. 前置校验提示（文件为空/格式错误）
  if (!file || file.size === 0) {
    const errorMsg = "❌ 请选择非空的Excel/CSV文件，空文件无法导入";
    console.error(errorMsg);
    throw new Error(errorMsg);
  }

  const validExtensions = ['xlsx', 'csv'];
  const fileExtension = file.name.split('.').pop()?.toLowerCase();
  if (!fileExtension || !validExtensions.includes(fileExtension)) {
    const errorMsg = `❌ 仅支持 .xlsx 和 .csv 格式文件，当前文件格式为 .${fileExtension || '未知'}`;
    console.error(errorMsg);
    throw new Error(errorMsg);
  }

  // 2. 创建FormData（与后端参数名对齐）
  const formData = new FormData();
  formData.append('table', table);
  formData.append('file', file);

  return api8000({
    url: "/admin/import_data",
    method: "POST",
    data: formData,
    headers: {
      'Content-Type': 'multipart/form-data'
    }
  })
  .then((response) => {
    const { total_data, new_data, duplicate_data } = response.data;
    let successMsg = "";
    if (total_data === 0) {
      successMsg = "✅ 文件导入成功，但文件中无有效数据（空内容）";
    } else {
      successMsg = `✅ 数据导入成功！共${total_data}条数据，新增${new_data}条，重复${duplicate_data}条`;
    }
    console.log(successMsg, "详情:", response.data);
    ElMessage.success(successMsg);
    return response.data;
  })
  .catch((error) => {
    let errorMsg = "❌ 导入失败，请稍后重试";

    if (error.response?.data) {
      const resData = error.response.data;
      if (resData.detail?.duplicate_count && resData.detail?.duplicates) {
        const { duplicate_count, duplicates, check_fields } = resData.detail;
        const duplicateDetails = duplicates.map((item: any) => 
          `第${item.row_number}行：${check_fields.map((f: string) => `${f}=${item.duplicate_fields[f] || '空值'}`).join('，')}`
        ).join('\n');
        errorMsg = `❌ 检测到${duplicate_count}条重复数据（基于${check_fields.join('、')}字段）：\n${duplicateDetails}`;
      } else if (resData.detail) {
        errorMsg = `❌ ${resData.detail.message || resData.detail}`;
      } else if (resData.message) {
        errorMsg = `❌ ${resData.message}`;
      }
    } else if (!error.response) {
      errorMsg = "❌ 网络异常或服务器无响应，请检查网络连接后重试";
    } else {
      errorMsg = "❌ 未知错误，可能是文件损坏或服务器繁忙";
    }

    console.error(errorMsg, "错误详情:", error);
    ElMessage.error(errorMsg);
    throw new Error(errorMsg);
  });
};

// 🔹 下载模板
export const downloadTemplate = (table: string, format: string = "excel") => {
  return api8000({
    url: "/admin/download_template",
    method: "GET",
    params: { table, format },
    responseType: "blob",
  })
    .then((response) => {
      const contentDisposition = response.headers["content-disposition"];
      if (!contentDisposition) {
        throw new Error("无法获取文件名");
      }
      const filenameMatch = contentDisposition.match(/filename=([^;]+)/);
      const filename = filenameMatch ? decodeURIComponent(filenameMatch[1]) : `${table}_template.${format === "excel" ? "xlsx" : "csv"}`;

      const blob = new Blob([response.data], {
        type: format === "excel"
          ? "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
          : "text/csv",
      });
      const url = window.URL.createObjectURL(blob);
      const link = document.createElement("a");
      link.href = url;
      link.download = filename;
      link.click();
      window.URL.revokeObjectURL(url);
    })
    .catch((error) => {
      console.error("❌ 下载模板失败:", error);
      throw error;
    });
};