import { postgrestGet, type PostgrestParams } from '../postgrest-client';
import dayjs from 'dayjs';
import { UPLOAD_URL, API_BASE_URL } from '../../config/api-config';
import axios from 'axios';
import { CONTRACT_TYPES, DEFAULT_CONTRACT_TYPE, type ContractType } from '~/constants/contractTypes';

/**
 * 检查文档名称是否重复
 * @param name 文档名称
 * @param typeId 文档类型ID
 * @returns 重复检查结果
 */
export async function checkDocumentDuplicate(
  name: string,
  typeId: number
): Promise<{ is_duplicate: boolean; count: number }> {
  try {
    // 获取 token
    let token: string | null = null;
    if (typeof window !== 'undefined') {
      token = localStorage.getItem('access_token');
    }

    const headers: Record<string, string> = {
      'Accept': 'application/json'
    };
    if (token) {
      headers['Authorization'] = `Bearer ${token}`;
    }

    const response = await axios.get(
      `${API_BASE_URL}/api/v2/documents/check-duplicate`,
      {
        params: { name, type_id: typeId },
        headers
      }
    );

    // 解析响应数据
    const data = response.data;
    if (data && typeof data === 'object') {
      // 处理标准响应格式 { code, msg, data }
      if ('data' in data && data.data) {
        return {
          is_duplicate: data.data.is_duplicate ?? false,
          count: data.data.count ?? 0
        };
      }
      // 直接返回数据格式
      return {
        is_duplicate: data.is_duplicate ?? false,
        count: data.count ?? 0
      };
    }

    return { is_duplicate: false, count: 0 };
  } catch (error) {
    console.error('【文档重名检查】检查失败:', error);
    // 检查失败时默认允许上传
    return { is_duplicate: false, count: 0 };
  }
}
// import { API_BASE_URL } from '../client';

/**
 * 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;
}

/**
 * 从 sessionStorage 获取文档类型 ID 列表（客户端专用）
 * @returns 文档类型 ID 数组，如果不存在则返回 null
 */
function getDocumentTypeIdsFromSession(): number[] | null {
    if (typeof window === 'undefined') {
        return null; // 服务端环境返回 null
    }

    try {
        const typeIdsStr = sessionStorage.getItem('documentTypeIds');
        if (!typeIdsStr) {
            return null;
        }

        const typeIds = JSON.parse(typeIdsStr);
        if (Array.isArray(typeIds) && typeIds.every(id => typeof id === 'number')) {
            return typeIds;
        }

        console.warn('⚠️ [getDocumentTypeIds] documentTypeIds 格式不正确:', typeIds);
        return null;
    } catch (error) {
        console.error('❌ [getDocumentTypeIds] 解析 documentTypeIds 失败:', error);
        return null;
    }
}

// 文档状态枚举
export enum DocumentStatus {
  waiting = 'waiting',
  WAITING = "Waiting",
  QUEUED = "Queued",           // 排队中
  CUTTING = "Cutting",
  EXTRACTIONING = "Extractioning",
  EVALUATIONING = "Evaluationing",
  FAILED = "Failed",
  PROCESSED = "Processed"
}

// 文档类型接口
export interface DocumentType {
  id: number;
  name: string;
  code?: string;
  entryModuleId?: number;
  isEnabled?: boolean;
  ruleSetIds?: number[];
}

// 提取结果接口
interface ExtractedResult {
  [key: string]: unknown;
}

// 摘要接口
interface Summary {
  [key: string]: unknown;
}

// 文档接口
export interface Document {
  id: number;
  name: string;
  type_id: number;
  file_size: number;
  status: DocumentStatus;
  created_at: string;
  document_number?: string;
  path?: string;
  storage_type?: string;
  is_test_document?: boolean;
  evaluation_level?: string;
  ocr_result?: Record<string, string>;
  extracted_results?: ExtractedResult;
  sumary?: Summary;
  remark?: string;
  audit_status?: number;
}

// 合同结构比较表接口
export interface ContractStructureComparison {
  id: number;
  template_contract_name: string;
  file_size: number;
  status: DocumentStatus;
  created_at: string;
  document_id?: number;
  template_contract_path?: string;
  ocr_results?: Record<string, unknown>;
  comparison_results?: Record<string, unknown>;
}

// 文件上传响应接口（兼容旧前端）
export interface UploadResult {
  success: boolean;
  documentId: number;
  fileId: number;
  fileName: string;
  fileSize: number;
  typeId: number;
  region: string;
  processingStatus: string;
  duplicateUpload: boolean;
  error?: string;
}

// 旧接口上传响应（uploadContractTemplate / appendContractAttachments 仍在使用）
interface LegacyUploadResponse {
  success: boolean;
  result?: { id: number; file_name: string; file_size: number; [key: string]: unknown };
  error: string | null;
}

// 新后端上传响应
interface NewUploadResponse {
  documentId: number;
  internalDocumentNo: number;
  versionGroupKey: string;
  versionNo: number;
  previousVersionId: number | null;
  rootVersionId: number;
  duplicateUpload: boolean;
  fileId: number;
  typeId: number;
  typeCode: string;
  region: string;
  fileName: string;
  ossUrl: string;
  speed: string;
  processingStatus: string;
  autoRunTriggered: boolean;
}

/**
 * 将文件转换为二进制数据
 */
export async function uploadFileToBinary(file: File): Promise<ArrayBuffer> {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.onload = () => {
      if (reader.result instanceof ArrayBuffer) {
        resolve(reader.result);
      } else {
        reject(new Error('文件读取失败'));
      }
    };
    reader.onerror = () => reject(new Error('文件读取失败'));
    reader.readAsArrayBuffer(file);
  });
}

/**
 * 上传文件到文档审核系统
 * @param binaryData 文件的二进制数据
 * @param fileName 文件名
 * @param fileType 文件类型
 * @param typeId 文档类型ID
 * @param priority 优先级
 * @param documentNumber 文档编号（可选）
 * @param remark 备注信息（可选）
 * @param isTestDocument 是否为测试文档
 * @param documentId 关联的文档ID（用于合同附件上传）
 * @param isReupload 是否为重新上传
 * @param jwtToken JWT token
 * @returns 上传结果
 */
/**
 * 上传合同模板（用于与合同文档结构对比）
 * @param file 模板文件
 * @param documentId 源合同文档ID
 * @param comparisonId 已有对比记录ID（可选）
 * @param jwtToken JWT token
 * @returns 上传结果
 */
export async function uploadContractTemplate(
  file: File,
  documentId: number,
  comparisonId?: number,
  jwtToken?: string
): Promise<{data: LegacyUploadResponse; error?: never} | {data?: never; error: string; status?: number}> {
  try {
    console.log('【合同模板上传】开始上传模板:', { fileName: file.name, documentId, comparisonId });
    
    // 创建FormData对象
    const formData = new FormData();
    
    // 添加文件
    formData.append('file', file);
    
    // 添加上传信息
    const uploadInfo = {
      document_id: documentId,
      ...(comparisonId && { comparison_id: comparisonId })
    };
    
    formData.append('upload_info', JSON.stringify(uploadInfo));
    
    // 构建请求URL
    const uploadUrl = `${UPLOAD_URL}/upload_contract_template`;
    console.log('【合同模板上传】准备发送请求到服务器:', uploadUrl);
    
    // 设置请求头
    const headers: HeadersInit = {
      'Accept': 'application/json'
    };

    // 从 localStorage 获取 token
    if (typeof window !== 'undefined') {
      const token = localStorage.getItem('access_token');
      if (token) {
        headers['Authorization'] = `Bearer ${token}`;
      }
    }
    
    // 发送请求
    const response = await axios.post(uploadUrl, formData, {
      headers
    });

    console.log('【合同模板上传】服务器响应状态:', response.status);

    const result = response.data;
    console.log('【合同模板上传】服务器返回结果:', result);

    if (result.success) {
      return { data: result.result };
    } else {
      return { error: result.error || '合同模板上传失败' };
    }
    
  } catch (error) {
    console.error('【合同模板上传】上传过程中发生错误:', error);
    return {
      error: error instanceof Error ? error.message : '合同模板上传过程中发生未知错误'
    };
  }
}

/**
 * 合同文档追加附件并合并
 * @param documentId 合同文档ID
 * @param files 附件文件列表
 * @param mergeMode 合并模式：'overwrite'（覆盖原文档）或 'new'（新建文档记录）
 * @param isReprocess 是否触发重新处理
 * @param remark 备注
 * @param token JWT token（可选）
 * @returns 上传结果
 */
export async function appendContractAttachments(
  documentId: number,
  files: File[],
  mergeMode: 'overwrite' | 'new' = 'overwrite',
  isReprocess: boolean = true,
  remark?: string,
  token?: string
): Promise<{data: LegacyUploadResponse; error?: never} | {data?: never; error: string; status?: number}> {
  try {
    console.log('【合同附件追加】开始追加附件:', { documentId, fileCount: files.length, mergeMode });
    
    // 创建FormData对象
    const formData = new FormData();
    
    // 添加多个文件
    files.forEach(file => {
      formData.append('files', file);
    });
    
    // 添加其他参数
    formData.append('merge_mode', mergeMode);
    formData.append('is_reprocess', isReprocess.toString());
    if (remark) {
      formData.append('remark', remark);
    }
    
    // 构建请求URL
    const uploadUrl = `${UPLOAD_URL}/contracts/${documentId}/append_attachments`;
    console.log('【合同附件追加】准备发送请求到服务器:', uploadUrl);

    // 设置请求头
    const headers: HeadersInit = {
      'Accept': 'application/json'
    };

    // 使用传入的 token 或从 localStorage 获取
    const authToken = token || (typeof window !== 'undefined' ? localStorage.getItem('access_token') : null);
    if (authToken) {
      headers['Authorization'] = `Bearer ${authToken}`;
    }

    // 发送请求
    const response = await axios.post(uploadUrl, formData, {
      headers
    });

    console.log('【合同附件追加】服务器响应状态:', response.status);

    const result = response.data;
    console.log('【合同附件追加】服务器返回结果:', result);

    if (result.success) {
      return { data: result.result };
    } else {
      return { error: result.error || '附件追加失败' };
    }
    
  } catch (error) {
    console.error('【合同附件追加】上传过程中发生错误:', error);
    return {
      error: error instanceof Error ? error.message : '附件追加过程中发生未知错误'
    };
  }
}

export async function uploadDocumentToServer(
  binaryData: ArrayBuffer,
  fileName: string,
  fileType: string,
  typeId: number,
  region: string = "default",
  createdBy?: number,
  autoRun: boolean = true,
  speed: string = "normal",
  jwtToken?: string,
): Promise<{ data: UploadResult } | { error: string; status?: number }> {
  try {
    const formData = new FormData();
    const blob = new Blob([binaryData], { type: fileType });
    formData.append("file", blob, fileName);
    formData.append("typeId", String(typeId));
    formData.append("region", region);
    formData.append("fileRole", "primary");
    if (createdBy !== undefined) {
      formData.append("createdBy", String(createdBy));
    }
    formData.append("autoRun", String(autoRun));
    formData.append("speed", speed);

    const headers: Record<string, string> = {
      "X-File-Name": encodeURIComponent(fileName),
    };
    if (jwtToken) {
      headers["Authorization"] = `Bearer ${jwtToken}`;
    }

    const response = await axios.post(`${API_BASE_URL}/api/upload`, formData, { headers });
    const body = response.data;

    // Result<DocumentUploadVO> envelope
    const uploadData: NewUploadResponse | undefined = body?.data;
    if (!uploadData || !uploadData.documentId) {
      return { error: body?.message || "上传响应解析失败", status: response.status };
    }

    return {
      data: {
        success: true,
        documentId: uploadData.documentId,
        fileId: uploadData.fileId,
        fileName: uploadData.fileName,
        fileSize: binaryData.byteLength,
        typeId: uploadData.typeId,
        region: uploadData.region,
        processingStatus: uploadData.processingStatus,
        duplicateUpload: uploadData.duplicateUpload,
      },
    };
  } catch (axiosError) {
    console.error("上传文档失败:", axiosError);
    if (axios.isAxiosError(axiosError)) {
      const serverMessage =
        (axiosError.response?.data as any)?.message ||
        (axiosError.response?.data as any)?.msg;
      return {
        error: serverMessage || `上传失败 (HTTP ${axiosError.response?.status || "unknown"})`,
        status: axiosError.response?.status,
      };
    }
    return { error: axiosError instanceof Error ? axiosError.message : "上传失败" };
  }
}

/**
 * 获取当天的文档列表
 * @param userInfo 用户信息（必需）
 * @param token JWT token
 * @param documentTypeIds 文档类型 ID 列表（可选）
 * @returns 文档列表
 */
export async function getTodayDocuments(
  userInfo?: { user_id?: number; [key: string]: unknown },
  token?: string,
  documentTypeIds?: number[]
): Promise<{data: Document[]; error?: never} | {data?: never; error: string; status?: number}> {
  try {
    if (!userInfo?.user_id) {
      return { error: "没有找到用户信息，请刷新重试", status: 401 };
    }

    const today = dayjs().startOf("day").format("YYYY-MM-DD");
    const params: Record<string, string | number> = {
      page: 1,
      pageSize: 50,
      userId: userInfo.user_id,
      dateFrom: today,
    };

    if (documentTypeIds && documentTypeIds.length > 0) {
      params.typeCode = ""; // 后续可按 typeId→typeCode 映射
    }

    const headers: Record<string, string> = {};
    if (token) {
      headers["Authorization"] = `Bearer ${token}`;
    }

    const response = await axios.get(`${API_BASE_URL}/api/documents/list`, { params, headers });
    const body = response.data;
    const items = body?.data?.documents || [];

    const documents: Document[] = items.map((doc: any) => ({
      id: doc.documentId,
      name: doc.fileName || doc.normalizedName || "未命名",
      type_id: doc.typeId || 0,
      file_size: doc.fileSize || 0,
      status: doc.processingStatus || "waiting",
      created_at: doc.updatedAt || "",
      document_number: String(doc.internalDocumentNo || ""),
      path: doc.ossUrl || "",
      audit_status: 0,
    }));

    return { data: documents };
  } catch (error) {
    console.error("获取当天文档列表失败:", error);
    return {
      error: error instanceof Error ? error.message : "获取当天文档列表失败",
      status: 500,
    };
  }
}

/**
 * 获取文档类型列表
 * @param token JWT token (可选)
 * @returns 文档类型列表
 */
export async function getDocumentTypes(token?: string): Promise<{data: DocumentType[]; error?: never} | {data?: never; error: string; status?: number}> {
  try {
    const documentTypeIds = getDocumentTypeIdsFromSession();
    const params: Record<string, string> = {};
    if (documentTypeIds && documentTypeIds.length > 0) {
      params.ids = documentTypeIds.join(",");
    }

    const headers: Record<string, string> = {};
    if (token) {
      headers["Authorization"] = `Bearer ${token}`;
    }

    const response = await axios.get(`${API_BASE_URL}/api/document-types`, { params, headers });
    const body = response.data;

    if (body?.data && Array.isArray(body.data)) {
      const types: DocumentType[] = body.data.map((item: { id: number; name: string; code?: string; entryModuleId?: number; isEnabled?: boolean; ruleSetIds?: number[] }) => ({
        id: item.id,
        name: item.name,
        code: item.code,
        entryModuleId: item.entryModuleId,
        isEnabled: item.isEnabled,
        ruleSetIds: item.ruleSetIds,
      }));
      return { data: types };
    }
    return { error: body?.message || "获取文档类型失败", status: response.status };
  } catch (error) {
    console.error("获取文档类型列表失败:", error);
    return {
      error: error instanceof Error ? error.message : "获取文档类型列表失败",
      status: 500,
    };
  }
}

/**
 * 获取指定文档的状态
 * @param documentIds 文档ID列表
 * @param attachmentIds 合同附件ID列表（可选）
 * @param token JWT token (可选)
 * @returns 文档状态列表
 */
export async function getDocumentsStatus(
  documentIds: number[],
  attachmentIds?: number[],
  token?: string
): Promise<{data: Document[]; error?: never} | {data?: never; error: string; status?: number}> {
  try {
    if ((!documentIds || documentIds.length === 0) && (!attachmentIds || attachmentIds.length === 0)) {
      return { data: [] };
    }

    // 查询主文档状态
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    let documentsResponse: any = { data: [], error: undefined, status: undefined };
    if (documentIds && documentIds.length > 0) {
      const documentsParams: PostgrestParams = {
        select: 'id, status',
        filter: {
          'id': `in.(${documentIds.join(',')})`
        }
      };
      documentsResponse = await postgrestGet<Document[]>('/api/postgrest/proxy/documents', { ...documentsParams, token });
    }

    // 查询合同附件状态
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    let attachmentResponse: any = { data: [], error: undefined, status: undefined };
    if (attachmentIds && attachmentIds.length > 0) {
      const attachmentParams: PostgrestParams = {
        select: 'id, status',
        filter: {
          'id': `in.(${attachmentIds.join(',')})`
        }
      };
      attachmentResponse = await postgrestGet<ContractStructureComparison[]>('/api/postgrest/proxy/contract_structure_comparison', { ...attachmentParams, token });
    }

    if (documentsResponse.error && attachmentResponse.error) {
      return { error: documentsResponse.error || attachmentResponse.error, status: documentsResponse.status || attachmentResponse.status };
    }

    let allData: Document[] = [];

    // 处理主文档数据
    if (!documentsResponse.error && documentsResponse.data) {
      const extractedDocuments = extractApiData<Document[]>(documentsResponse.data);
      if (extractedDocuments) {
        allData = [...allData, ...extractedDocuments];
      }
    }

    // 处理合同附件数据
    if (!attachmentResponse.error && attachmentResponse.data) {
      const extractedAttachments = extractApiData<ContractStructureComparison[]>(attachmentResponse.data);
      if (extractedAttachments) {
        // 将ContractStructureComparison转换为Document格式
        const convertedAttachments: Document[] = extractedAttachments.map(item => ({
          id: item.id,
          name: item.template_contract_name || `合同结构比较记录_${item.id}`,
          type_id: 1,
          file_size: item.file_size || 0,
          status: item.status,
          created_at: item.created_at
        }));
        allData = [...allData, ...convertedAttachments];
      }
    }

    return { data: allData };
  } catch (error) {
    console.error('获取文档状态失败:', error);
    return {
      error: error instanceof Error ? error.message : '获取文档状态失败',
      status: 500
    };
  }
}