import { postgrestGet, postgrestDelete, postgrestPut, type PostgrestParams } from '../postgrest-client';
import dayjs from 'dayjs';
import { getDocumentTypes } from '../document-types/document-types';

/**
 * 从不同格式的 API 响应中提取数据
 * @param responseData API 响应数据
 * @returns 提取后的数据或 null
 */
function extractApiData<T>(responseData: unknown): T | null {
  if (!responseData) return null;
  
  // 格式1: { code: number, msg: string, data: T }
  if (typeof responseData === 'object' && responseData !== null && 
      'code' in responseData && 
      'data' in responseData && 
      (responseData as { data: unknown }).data) {
    return (responseData as { data: T }).data;
  }
  
  // 格式2: 直接是数据对象
  return responseData as T;
}

/**
 * 格式化日期
 * @param dateString 日期字符串
 * @returns 格式化后的日期字符串
 */
function formatDate(dateString: string): string {
    if (!dateString) return '';
    try {
      return dayjs(dateString).format('YYYY-MM-DD HH:mm:ss');
    } catch (error) {
      console.error('日期格式化失败:', error);
      return dateString;
    }
  }

/**
 * 查询参数
 */
export interface DocumentSearchParams {
  name?: string;
  documentNumber?: string;
  documentType?: string;
  status?: string;
  auditStatus?: string;
  fileStatus?: string;
  dateFrom?: string;
  dateTo?: string;
  page?: number;
  pageSize?: number;
}

/**
 * 数据库文档结构
 */
export interface Document {
  id: number;
  user_id: number | null;
  type_id: number;
  name: string;
  document_number: string;
  path: string;
  storage_type: string;
  file_size: number;
  upload_time: string;
  is_test_document: boolean;
  evaluation_level: string;
  status: 'pass' | 'warning' | 'waiting' | 'processing' | 'fail';
  file_status: 'Waiting' | 'Cutting' | 'Extractioning' | 'Evaluationing' | 'Processed';
  audit_status: number; // -1: 不通过, 0: 待审核, 1: 通过, 2: 警告, 3: 审核中
  ocr_result?: {
    __meta?: {
      page_count?: number;
    }
  };
  extracted_results?: unknown;
  summary?: unknown;
  remark?: string;
  created_at: string;
  updated_at: string;
}

/**
 * 前端UI文档结构
 */
export interface DocumentUI {
  id: number;
  name: string;
  documentNumber: string;
  type: string;
  typeName: string;
  size: number;
  auditStatus: number; // -1: 不通过, 0: 待审核, 1: 通过, 2: 警告, 3: 审核中
  fileStatus: string; // Waiting, Cutting, Extractioning, Evaluationing, Processed
  issues: number | null;
  uploadTime: string;
  fileType: string;
  path: string;
  isTest: boolean;
  updatedAt?: string;
  pageCount?: number;
}

/**
 * 获取文件扩展名
 * @param filename 文件名
 * @returns 文件扩展名
 */
function getFileExtension(filename: string): string {
  const parts = filename.split('.');
  return parts.length > 1 ? parts.pop()?.toLowerCase() || '' : '';
}

/**
 * 将API文档转换为UI文档
 */
async function convertToUIDocument(doc: Document): Promise<DocumentUI> {
  // 获取文档类型信息
  const typeResponse = await getDocumentTypes();
  const documentTypes = typeResponse.data?.types || [];
  const docType = documentTypes.find(type => type.id.toString() === doc.type_id.toString());

  return {
    id: doc.id,
    name: doc.name,
    documentNumber: doc.document_number,
    type: doc.type_id.toString(),
    typeName: docType?.name || '未知类型',
    size: doc.file_size,
    auditStatus: doc.audit_status || 0,
    fileStatus: doc.status || '', // 默认为''
    issues: 0, // 固定为0
    uploadTime: formatDate(doc.updated_at),
    fileType: getFileExtension(doc.name),
    path: doc.path,
    isTest: doc.is_test_document,
    updatedAt: formatDate(doc.updated_at),
    pageCount: doc.ocr_result?.__meta?.page_count || 0
  };
}

/**
 * 获取文档列表
 * @param searchParams 搜索参数
 * @returns 文档列表和总数
 */
export async function getDocuments(searchParams: DocumentSearchParams = {}): Promise<{
  data?: { documents: DocumentUI[], total: number };
  error?: string;
  status?: number;
}> {
  try {
    const page = searchParams.page || 1;
    const pageSize = searchParams.pageSize || 10;
    
    // 构建查询参数
    const params: PostgrestParams = {
      select: '*',
      order: 'updated_at.desc',
      headers: {
        'Prefer': 'count=exact'
      },
      limit: pageSize,
      offset: (page - 1) * pageSize,
      filter: {} as Record<string, string>
    };
    
    // 添加筛选条件
    const filter: Record<string, string> = {};
    
    if (searchParams.name) {
      filter['name'] = `ilike.%${searchParams.name}%`;
    }
    
    if (searchParams.documentNumber) {
      filter['document_number'] = `ilike.%${searchParams.documentNumber}%`;
    }
    
    if (searchParams.documentType) {
      filter['type_id'] = `eq.${searchParams.documentType}`;
    }
    
    if (searchParams.auditStatus) {
      filter['audit_status'] = `eq.${searchParams.auditStatus}`;
    }
    
    if (searchParams.fileStatus) {
      filter['status'] = `eq.${searchParams.fileStatus}`;
    }
    
    // 处理日期范围
    if (searchParams.dateFrom) {
      // 添加当天开始时间 00:00:00
      filter['created_at'] = `gte.'${dayjs(`${searchParams.dateFrom} 00:00:00`).format()}'`;
    }
    
    if (searchParams.dateTo) {
      // 如果有开始日期，使用and条件；否则直接设置结束日期
      const dateToKey = searchParams.dateFrom ? 'and' : 'created_at';
      const newDateFrom = dayjs(`${searchParams.dateFrom} 00:00:00`).format();
      const newDateTo = dayjs(`${searchParams.dateTo} 23:59:59`).format();
      // 添加当天结束时间 23:59:59
      if (dateToKey === 'and') {
        delete filter['created_at'];
        // 使用OR操作符连接两个条件
        filter[dateToKey] = `(created_at.gte.'${newDateFrom}',created_at.lte.'${newDateTo}')`;
      } else {
        filter['created_at'] = `lte.'${newDateTo}'`;
      }
    }
    
    // console.log('filter-----', filter);
    params.filter = filter;
    
    // 发送请求
    const response = await postgrestGet<Document[]>('documents', params);
    
    if (response.error) {
      return { error: response.error, status: response.status };
    }
    
    // 提取数据
    const extractedData = extractApiData<Document[]>(response.data);
    if (!extractedData) {
      return { error: '获取文档数据失败', status: 500 };
    }
    
    // 转换为UI格式
    const documents = await Promise.all(extractedData.map(convertToUIDocument));
    // console.log('documentsItem',documents)
    // 获取总数
    let totalCount = 0;
    const responseWithHeaders = response as { 
      data: unknown; 
      headers?: Record<string, string> 
    };
    
    if (responseWithHeaders.headers) {
      const rangeHeader = responseWithHeaders.headers['content-range'];
      if (rangeHeader) {
        const total = rangeHeader.split('/')[1];
        if (total !== '*') {
          totalCount = parseInt(total, 10);
        }
      }
    }
    
    return {
      data: {
        documents,
        total: totalCount || documents.length
      }
    };
  } catch (error) {
    console.error('获取文档列表失败:', error);
    return {
      error: error instanceof Error ? error.message : '获取文档列表失败',
      status: 500
    };
  }
}

/**
 * 删除文档
 * @param id 文档ID
 * @returns 删除结果
 */
export async function deleteDocument(id: string): Promise<{
  success?: boolean;
  error?: string;
  status?: number;
}> {
  try {
    if (!id) {
      return { error: '文档ID不能为空', status: 400 };
    }
    
    const response = await postgrestDelete(
      'documents',
      {
        filter: {
          'id': `eq.${id}`
        }
      }
    );
    
    if (response.error) {
      return { error: response.error, status: response.status };
    }
    
    return { success: true };
  } catch (error) {
    console.error('删除文档失败:', error);
    return {
      error: error instanceof Error ? error.message : '删除文档失败',
      status: 500
    };
  }
}

/**
 * 获取单个文档详情
 * @param id 文档ID
 * @returns 文档详情
 */
export async function getDocument(id: string): Promise<{
  data?: DocumentUI;
  error?: string;
  status?: number;
}> {
  try {
    if (!id) {
      return { error: '文档ID不能为空', status: 400 };
    }
    
    const response = await postgrestGet<Document[]>(
      'documents',
      {
        filter: {
          'id': `eq.${id}`
        },
        limit: 1
      }
    );
    
    if (response.error) {
      return { error: response.error, status: response.status };
    }
    
    const extractedData = extractApiData<Document[]>(response.data);
    if (!extractedData || extractedData.length === 0) {
      return { error: '文档不存在', status: 404 };
    }
    
    const documentUI = await convertToUIDocument(extractedData[0]);
    
    return { data: documentUI };
  } catch (error) {
    console.error('获取文档详情失败:', error);
    return {
      error: error instanceof Error ? error.message : '获取文档详情失败',
      status: 500
    };
  }
}

/**
 * 获取文件下载链接
 * @param filePath 文件路径
 * @returns 下载链接
 */
export async function getFileDownloadUrl(filePath: string): Promise<{
  data?: { downloadUrl: string };
  error?: string;
  status?: number;
}> {
  try {
    if (!filePath) {
      return { error: '文件路径不能为空', status: 400 };
    }
    
    // 这里应该调用获取文件下载链接的API
    // 假设后端有这样的端点：/api/files/generate-download-url?path=xxx
    // 实际项目中需要根据你的后端API调整
    
    // 临时解决方案：返回Remix路由路径
    // 这将通过Remix服务器代理对文件的访问
    return {
      data: {
        downloadUrl: `/documents/download?path=${encodeURIComponent(filePath)}`
      }
    };
    
  } catch (error) {
    console.error('获取文件下载链接失败:', error);
    return {
      error: error instanceof Error ? error.message : '获取文件下载链接失败',
      status: 500
    };
  }
}

/**
 * 更新文档信息
 * @param id 文档ID
 * @param document 部分文档数据
 * @returns 更新结果
 */
export async function updateDocument(id: string, document: Partial<DocumentUI> & { remark?: string }): Promise<{
  data?: DocumentUI;
  error?: string;
  status?: number;
}> {
  try {
    if (!id) {
      return { error: '文档ID不能为空', status: 400 };
    }
    
    // 准备API数据 - 将UI数据转换为API格式
    const apiDocument: Partial<Document> = {};
    
    if (document.documentNumber !== undefined) {
      apiDocument.document_number = document.documentNumber;
    }
    
    if (document.type !== undefined) {
      apiDocument.type_id = parseInt(document.type);
    }
    
    if (document.auditStatus !== undefined) {
      apiDocument.audit_status = document.auditStatus;
    }
    
    if (document.isTest !== undefined) {
      apiDocument.is_test_document = document.isTest;
    }
    
    if (document.remark !== undefined) {
      apiDocument.remark = document.remark;
    }
    
    console.log('更新文档API数据:', apiDocument);
    
    const response = await postgrestPut<Document, Partial<Document>>(
      'documents',
      apiDocument,
      { id: parseInt(id) }
    );
    
    if (response.error) {
      console.error('更新文档API错误:', response.error);
      return { error: response.error, status: response.status };
    }
    
    // 获取更新后的完整文档数据
    const updatedResponse = await getDocument(id);
    
    return updatedResponse;
  } catch (error) {
    console.error('更新文档信息失败:', error);
    return {
      error: error instanceof Error ? error.message : '更新文档信息失败',
      status: 500
    };
  }
}