/**
 * DC模块 - 提取控制器
 * 
 * API端点：
 * - POST /api/v1/dc/tool-b/health-check - 健康检查
 * - GET /api/v1/dc/tool-b/templates - 获取模板列表
 * - POST /api/v1/dc/tool-b/tasks - 创建提取任务
 * - GET /api/v1/dc/tool-b/tasks/:taskId/progress - 查询任务进度
 * - GET /api/v1/dc/tool-b/tasks/:taskId/items - 获取验证网格数据
 * - POST /api/v1/dc/tool-b/items/:itemId/resolve - 裁决冲突
 * 
 * 平台能力复用：
 * - ✅ logger: 日志记录
 * - ✅ prisma: 数据库操作
 * - ✅ storage: 文件操作
 * - ✅ jobQueue: 异步任务
 */

import { FastifyRequest, FastifyReply } from 'fastify';
import { healthCheckService } from '../services/HealthCheckService.js';
import { templateService } from '../services/TemplateService.js';
import { dualModelExtractionService } from '../services/DualModelExtractionService.js';
import { conflictDetectionService } from '../services/ConflictDetectionService.js';
import { storage } from '../../../../common/storage/index.js';
import { logger } from '../../../../common/logging/index.js';
import { prisma } from '../../../../config/database.js';
import * as xlsx from 'xlsx';

export class ExtractionController {
  /**
   * 文件上传
   * POST /upload
   */
  async uploadFile(request: FastifyRequest, reply: FastifyReply) {
    try {
      const data = await request.file();
      
      if (!data) {
        return reply.code(400).send({
          success: false,
          error: 'No file uploaded'
        });
      }

      const userId = (request as any).userId || 'default-user';
      const buffer = await data.toBuffer();
      const originalFilename = data.filename;
      const timestamp = Date.now();
      const fileKey = `dc/tool-b/${userId}/${timestamp}_${originalFilename}`;
      
      logger.info('[API] File upload request', { 
        filename: originalFilename, 
        size: buffer.length,
        userId 
      });
      
      // 解析Excel文件获取列名和行数
      const workbook = xlsx.read(buffer, { type: 'buffer' });
      const sheetName = workbook.SheetNames[0];
      const worksheet = workbook.Sheets[sheetName];
      const jsonData = xlsx.utils.sheet_to_json<Record<string, any>>(worksheet);
      
      // 获取列名（从第一行数据的keys）
      const columns = jsonData.length > 0 ? Object.keys(jsonData[0]) : [];
      const totalRows = jsonData.length;
      
      logger.info('[API] Excel parsed', { columns, totalRows });
      
      // 上传到storage
      const url = await storage.upload(fileKey, buffer);
      
      logger.info('[API] File uploaded successfully', { fileKey, url });
      
      return reply.code(200).send({
        success: true,
        data: {
          fileKey,
          url,
          filename: originalFilename,
          size: buffer.length,
          totalRows,
          columns
        }
      });
    } catch (error) {
      logger.error('[API] File upload failed', { error });
      return reply.code(500).send({
        success: false,
        error: String(error)
      });
    }
  }

  /**
   * 健康检查
   * POST /health-check
   */
  async healthCheck(request: FastifyRequest<{
    Body: {
      fileKey: string;
      columnName: string;
    }
  }>, reply: FastifyReply) {
    try {
      const { fileKey, columnName } = request.body;
      const userId = (request as any).userId || 'default-user'; // TODO: 从auth middleware获取
      
      logger.info('[API] Health check request', { fileKey, columnName, userId });
      
      // 参数验证
      if (!fileKey || !columnName) {
        logger.error('[API] Missing required parameters', { fileKey, columnName });
        return reply.code(400).send({
          success: false,
          error: 'Missing required parameters: fileKey or columnName'
        });
      }
      
      const result = await healthCheckService.check(fileKey, columnName, userId);
      
      logger.info('[API] Health check success', { status: result.status });
      
      return reply.code(200).send({
        success: true,
        data: result
      });
      
    } catch (error: any) {
      logger.error('[API] Health check failed', { 
        error: error.message,
        stack: error.stack,
        fileKey: request.body?.fileKey,
        columnName: request.body?.columnName
      });
      
      return reply.code(500).send({
        success: false,
        error: error.message || String(error),
        details: process.env.NODE_ENV === 'development' ? error.stack : undefined
      });
    }
  }
  
  /**
   * 获取模板列表
   * GET /templates
   */
  async getTemplates(request: FastifyRequest, reply: FastifyReply) {
    try {
      logger.info('[API] Get templates request');
      
      const templates = await templateService.getAllTemplates();
      
      return reply.code(200).send({
        success: true,
        data: { templates }
      });
      
    } catch (error) {
      logger.error('[API] Get templates failed', { error });
      return reply.code(500).send({
        success: false,
        error: String(error)
      });
    }
  }
  
  /**
   * 创建提取任务
   * POST /tasks
   */
  async createTask(request: FastifyRequest<{
    Body: {
      projectName: string;
      sourceFileKey: string;
      textColumn: string;
      diseaseType: string;
      reportType: string;
      modelA?: string;
      modelB?: string;
    }
  }>, reply: FastifyReply) {
    try {
      logger.info('[API] ===== CREATE TASK START =====');
      
      const {
        projectName,
        sourceFileKey,
        textColumn,
        diseaseType,
        reportType,
        modelA = 'deepseek-v3',
        modelB = 'qwen-max'
      } = request.body;
      const userId = (request as any).userId || 'default-user';
      
      logger.info('[API] Create task request', {
        userId,
        projectName,
        sourceFileKey,
        textColumn,
        diseaseType,
        reportType
      });
      
      // 1. 获取模板
      logger.info('[API] Step 1: Getting template', { diseaseType, reportType });
      const template = await templateService.getTemplate(diseaseType, reportType);
      if (!template) {
        logger.error('[API] Template not found', { diseaseType, reportType });
        return reply.code(404).send({
          success: false,
          error: `Template not found: ${diseaseType}/${reportType}`
        });
      }
      logger.info('[API] Template found', { templateId: template.id });
      
      // 2. 读取Excel文件，创建items
      logger.info('[API] Step 2: Downloading Excel file', { sourceFileKey });
      const fileBuffer = await storage.download(sourceFileKey);
      if (!fileBuffer) {
        logger.error('[API] File not found in storage', { sourceFileKey });
        return reply.code(404).send({
          success: false,
          error: `File not found: ${sourceFileKey}`
        });
      }
      logger.info('[API] File downloaded', { size: fileBuffer.length });
      
      logger.info('[API] Step 3: Parsing Excel file');
      const workbook = xlsx.read(fileBuffer, { type: 'buffer' });
      const sheetName = workbook.SheetNames[0];
      const worksheet = workbook.Sheets[sheetName];
      const data = xlsx.utils.sheet_to_json<Record<string, any>>(worksheet);
      logger.info('[API] Excel parsed', { rowCount: data.length });
      
      if (!data[0].hasOwnProperty(textColumn)) {
        logger.error('[API] Column not found', { 
          textColumn, 
          availableColumns: Object.keys(data[0]) 
        });
        return reply.code(400).send({
          success: false,
          error: `Column '${textColumn}' not found in Excel`
        });
      }
      
      // 3. 创建任务
      logger.info('[API] Step 4: Creating task in database');
      const task = await prisma.dCExtractionTask.create({
        data: {
          userId,
          projectName,
          sourceFileKey,
          textColumn,
          diseaseType,
          reportType,
          targetFields: template.fields as any, // Prisma Json类型
          modelA,
          modelB,
          totalCount: data.length,
          status: 'pending'
        }
      });
      logger.info('[API] Task created in database', { taskId: task.id });
      
      // 4. 创建items
      logger.info('[API] Step 5: Creating extraction items', { count: data.length });
      const itemsData = data.map((row, index) => ({
        taskId: task.id,
        rowIndex: index + 1,
        originalText: String(row[textColumn] || '')
      }));
      
      await prisma.dCExtractionItem.createMany({
        data: itemsData
      });
      logger.info('[API] Items created', { count: itemsData.length });
      
      // 5. 启动异步任务
      // TODO: 使用jobQueue.add()
      // 暂时直接调用
      logger.info('[API] Starting batch extraction (async)', { taskId: task.id });
      
      dualModelExtractionService.batchExtract(task.id)
        .then(() => {
          logger.info('[API] Batch extraction completed successfully', { taskId: task.id });
        })
        .catch(err => {
          logger.error('[API] Batch extraction failed', { 
            error: err.message,
            stack: err.stack,
            taskId: task.id 
          });
        });
      
      logger.info('[API] Task created', { taskId: task.id, itemCount: data.length });
      
      return reply.code(201).send({
        success: true,
        data: {
          taskId: task.id,
          totalCount: data.length,
          status: 'pending'
        }
      });
      
    } catch (error) {
      logger.error('[API] Create task failed', { error });
      return reply.code(500).send({
        success: false,
        error: String(error)
      });
    }
  }
  
  /**
   * 查询任务进度
   * GET /tasks/:taskId/progress
   */
  async getTaskProgress(request: FastifyRequest<{
    Params: { taskId: string }
  }>, reply: FastifyReply) {
    try {
      const { taskId } = request.params;
      
      logger.info('[API] Get task progress', { taskId });
      
      const task = await prisma.dCExtractionTask.findUnique({
        where: { id: taskId }
      });
      
      if (!task) {
        return reply.code(404).send({
          success: false,
          error: 'Task not found'
        });
      }
      
      return reply.code(200).send({
        success: true,
        data: {
          taskId: task.id,
          status: task.status,
          totalCount: task.totalCount,
          processedCount: task.processedCount,
          cleanCount: task.cleanCount,
          conflictCount: task.conflictCount,
          failedCount: task.failedCount,
          totalTokens: task.totalTokens,
          totalCost: task.totalCost,
          progress: task.totalCount > 0 ? Math.round((task.processedCount / task.totalCount) * 100) : 0
        }
      });
      
    } catch (error) {
      logger.error('[API] Get task progress failed', { error });
      return reply.code(500).send({
        success: false,
        error: String(error)
      });
    }
  }
  
  /**
   * 获取验证网格数据
   * GET /tasks/:taskId/items
   */
  async getTaskItems(request: FastifyRequest<{
    Params: { taskId: string };
    Querystring: { page?: string; limit?: string; status?: string }
  }>, reply: FastifyReply) {
    try {
      const { taskId } = request.params;
      const page = parseInt(request.query.page || '1');
      const limit = parseInt(request.query.limit || '50');
      const statusFilter = request.query.status;
      
      logger.info('[API] Get task items', { taskId, page, limit, statusFilter });
      
      const where: any = { taskId };
      if (statusFilter) {
        where.status = statusFilter;
      }
      
      const [items, total] = await Promise.all([
        prisma.dCExtractionItem.findMany({
          where,
          skip: (page - 1) * limit,
          take: limit,
          orderBy: { rowIndex: 'asc' }
        }),
        prisma.dCExtractionItem.count({ where })
      ]);
      
      return reply.code(200).send({
        success: true,
        data: {
          items: items.map(item => ({
            id: item.id,
            rowIndex: item.rowIndex,
            originalText: item.originalText,
            resultA: item.resultA,
            resultB: item.resultB,
            status: item.status,
            conflictFields: item.conflictFields,
            finalResult: item.finalResult
          })),
          pagination: {
            page,
            limit,
            total,
            totalPages: Math.ceil(total / limit)
          }
        }
      });
      
    } catch (error) {
      logger.error('[API] Get task items failed', { error });
      return reply.code(500).send({
        success: false,
        error: String(error)
      });
    }
  }
  
  /**
   * 裁决冲突
   * POST /items/:itemId/resolve
   */
  async resolveConflict(request: FastifyRequest<{
    Params: { itemId: string };
    Body: {
      field: string;
      chosenValue: string;
    }
  }>, reply: FastifyReply) {
    try {
      const { itemId } = request.params;
      const { field, chosenValue } = request.body;
      
      logger.info('[API] Resolve conflict', { itemId, field });
      
      // 获取当前记录
      const item = await prisma.dCExtractionItem.findUnique({
        where: { id: itemId }
      });
      
      if (!item) {
        return reply.code(404).send({
          success: false,
          error: 'Item not found'
        });
      }
      
      // 更新finalResult
      const finalResult = { ...(item.finalResult as Record<string, string> || {}) };
      finalResult[field] = chosenValue;
      
      // 移除已解决的冲突字段
      const conflictFields = item.conflictFields.filter(f => f !== field);
      
      // 更新状态
      const newStatus = conflictFields.length === 0 ? 'resolved' : 'conflict';
      
      await prisma.dCExtractionItem.update({
        where: { id: itemId },
        data: {
          finalResult,
          conflictFields,
          status: newStatus,
          resolvedAt: conflictFields.length === 0 ? new Date() : null
        }
      });
      
      logger.info('[API] Conflict resolved', { itemId, field, newStatus });
      
      return reply.code(200).send({
        success: true,
        data: {
          itemId,
          status: newStatus,
          remainingConflicts: conflictFields.length
        }
      });
      
    } catch (error) {
      logger.error('[API] Resolve conflict failed', { error });
      return reply.code(500).send({
        success: false,
        error: String(error)
      });
    }
  }

  /**
   * 导出结果
   * GET /tasks/:taskId/export
   */
  async exportResults(request: FastifyRequest<{
    Params: { taskId: string };
  }>, reply: FastifyReply) {
    try {
      const { taskId } = request.params;
      
      logger.info('[API] Export results request', { taskId });
      
      // 获取任务和所有items
      const task = await prisma.dCExtractionTask.findUnique({
        where: { id: taskId },
        include: {
          items: {
            orderBy: { rowIndex: 'asc' }
          }
        }
      });
      
      if (!task) {
        return reply.code(404).send({
          success: false,
          error: 'Task not found'
        });
      }
      
      // 创建Excel工作簿
      const workbook = xlsx.utils.book_new();
      
      // 🔑 获取字段顺序（从targetFields）
      const targetFields = task.targetFields as { name: string; desc: string }[];
      const fieldNames = targetFields.map(f => f.name);
      
      // 构建数据行，按模板字段顺序
      const rows = task.items.map(item => {
        // 优先使用finalResult，如果为空则使用resultA
        const finalResult = item.finalResult as Record<string, string> | null;
        const resultA = item.resultA as Record<string, string> | null;
        const extractedData = finalResult || resultA || {};
        
        // 🔑 按字段顺序构建行对象
        const row: Record<string, any> = {
          '行号': item.rowIndex,
          '原文': item.originalText,
          '状态': item.status === 'resolved' ? '已解决' : item.status === 'clean' ? '一致' : '待裁决'
        };
        
        // 按模板定义的顺序添加字段
        fieldNames.forEach(fieldName => {
          row[fieldName] = extractedData[fieldName] || '未提及';
        });
        
        return row;
      });
      
      // 创建工作表
      const worksheet = xlsx.utils.json_to_sheet(rows);
      xlsx.utils.book_append_sheet(workbook, worksheet, '提取结果');
      
      // 生成Excel Buffer
      const excelBuffer = xlsx.write(workbook, { type: 'buffer', bookType: 'xlsx' });
      
      logger.info('[API] Export results success', { taskId, rowCount: rows.length });
      
      // 返回文件
      // 🔑 对文件名进行URL编码以支持中文
      const filename = `${task.projectName}_结果.xlsx`;
      const encodedFilename = encodeURIComponent(filename);
      
      return reply
        .code(200)
        .header('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')
        .header('Content-Disposition', `attachment; filename*=UTF-8''${encodedFilename}`)
        .send(excelBuffer);
      
    } catch (error) {
      logger.error('[API] Export results failed', { error });
      return reply.code(500).send({
        success: false,
        error: String(error)
      });
    }
  }
}

// 导出单例
export const extractionController = new ExtractionController();