import { Router } from 'express';
import { query } from 'express-validator';
import { spawn } from 'child_process';
import path from 'path';
import { fileURLToPath } from 'url';
import { authenticate } from '../middleware/auth.js';
import { asyncHandler } from '../middleware/error.js';
import { validateRequest } from '../middleware/validate.js';
import { WorkDayStatisticsService } from '../services/WorkDayStatisticsService.js';
import { logger } from '../utils/logger.js';

/**
 * Work day statistics（原 Python 统计接口的 Node 版本）
 * 目的：避免前端强依赖本地 Python 服务（:5005）
 */
const router = Router();
const workDayStatisticsService = new WorkDayStatisticsService();

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// 所有路由需要认证
router.use(authenticate);

function runPythonExportXlsx(payload: unknown): Promise<Buffer> {
  const pythonBin = process.env.PYTHON_BIN || 'python';
  const scriptPath = path.resolve(__dirname, '../../python/export_work_day_overview_xlsx.py');

  return new Promise((resolve, reject) => {
    const child = spawn(pythonBin, [scriptPath], {
      stdio: ['pipe', 'pipe', 'pipe'],
      windowsHide: true,
    });

    const stdoutChunks: Buffer[] = [];
    const stderrChunks: Buffer[] = [];

    child.stdout.on('data', (d) => stdoutChunks.push(Buffer.from(d)));
    child.stderr.on('data', (d) => stderrChunks.push(Buffer.from(d)));

    child.on('error', (err) => {
      reject(err);
    });

    child.on('close', (code) => {
      if (code === 0) {
        resolve(Buffer.concat(stdoutChunks));
        return;
      }
      const stderr = Buffer.concat(stderrChunks).toString('utf-8').slice(0, 4000);
      reject(new Error(`Python export failed (code=${code}). ${stderr}`));
    });

    // stdin 写入 JSON（注意：不要写入额外换行/日志到 stdout）
    try {
      child.stdin.write(JSON.stringify(payload ?? {}), 'utf-8');
      child.stdin.end();
    } catch (e) {
      child.kill();
      reject(e);
    }
  });
}

function runPythonExportPlatformXlsx(payload: unknown): Promise<Buffer> {
  const pythonBin = process.env.PYTHON_BIN || 'python';
  const scriptPath = path.resolve(__dirname, '../../python/export_platform_statistics_xlsx.py');

  return new Promise((resolve, reject) => {
    const child = spawn(pythonBin, [scriptPath], {
      stdio: ['pipe', 'pipe', 'pipe'],
      windowsHide: true,
    });

    const stdoutChunks: Buffer[] = [];
    const stderrChunks: Buffer[] = [];

    child.stdout.on('data', (d) => stdoutChunks.push(Buffer.from(d)));
    child.stderr.on('data', (d) => stderrChunks.push(Buffer.from(d)));

    child.on('error', (err) => {
      reject(err);
    });

    child.on('close', (code) => {
      if (code === 0) {
        resolve(Buffer.concat(stdoutChunks));
        return;
      }
      const stderr = Buffer.concat(stderrChunks).toString('utf-8').slice(0, 4000);
      reject(new Error(`Python export failed (code=${code}). ${stderr}`));
    });

    try {
      child.stdin.write(JSON.stringify(payload ?? {}), 'utf-8');
      child.stdin.end();
    } catch (e) {
      child.kill();
      reject(e);
    }
  });
}

/**
 * GET /api/work-day-statistics/overview
 * 获取数据总览（账号列表和汇总统计）
 *
 * 兼容前端可能传入的 user_id，但服务端始终以 JWT 用户为准。
 */
router.get(
  '/overview',
  [
    // 前端历史遗留参数：不强制，但如果传了也应为数字
    query('user_id').optional().isInt().withMessage('user_id 必须是整数'),
    validateRequest,
  ],
  asyncHandler(async (req, res) => {
    const data = await workDayStatisticsService.getOverview(req.user!.userId);
    res.json({ success: true, data });
  })
);

/**
 * GET /api/work-day-statistics/platforms/export
 * 导出“平台数据”xlsx（Node 调用 Python 生成）
 *
 * 查询参数：
 * - startDate: 开始日期（必填）
 * - endDate: 结束日期（必填）
 */
router.get(
  '/platforms/export',
  [
    query('startDate').notEmpty().withMessage('startDate 不能为空'),
    query('endDate').notEmpty().withMessage('endDate 不能为空'),
    validateRequest,
  ],
  asyncHandler(async (req, res) => {
    const { startDate, endDate } = req.query;

    const data = await workDayStatisticsService.getStatisticsByPlatform(req.user!.userId, {
      startDate: startDate as string,
      endDate: endDate as string,
    });

    const exportPayload = {
      platforms: data.map((p) => ({
        platform: p.platform || '',
        viewsCount: p.viewsCount,
        commentsCount: p.commentsCount,
        likesCount: p.likesCount,
        fansIncrease: p.fansIncrease,
        // 使用 endDate 作为“更新时间”展示（仅日期）
        updateTime: p.updateTime || '',
      })),
    };

    const xlsxBuffer = await runPythonExportPlatformXlsx(exportPayload);

    const now = new Date();
    const yyyy = now.getFullYear();
    const mm = String(now.getMonth() + 1).padStart(2, '0');
    const dd = String(now.getDate()).padStart(2, '0');
    const hh = String(now.getHours()).padStart(2, '0');
    const mi = String(now.getMinutes()).padStart(2, '0');
    const ss = String(now.getSeconds()).padStart(2, '0');
    const filename = `platform_statistics_${yyyy}${mm}${dd}_${hh}${mi}${ss}.xlsx`;

    res.setHeader('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
    res.setHeader('Content-Disposition', `attachment; filename="${filename}"`);
    res.send(xlsxBuffer);
  })
);

/**
 * GET /api/work-day-statistics/overview/export
 * 导出“数据总览”xlsx（Node 调用 Python 生成）
 *
 * 可选筛选参数：
 * - groupId: 分组ID
 * - platform: 平台（douyin/baijiahao/weixin_video/xiaohongshu）
 * - keyword: 账号关键字（nickname/username）
 */
router.get(
  '/overview/export',
  [
    query('groupId').optional().isInt().withMessage('groupId 必须是整数'),
    query('platform').optional().isString().withMessage('platform 必须是字符串'),
    query('keyword').optional().isString().withMessage('keyword 必须是字符串'),
    validateRequest,
  ],
  asyncHandler(async (req, res) => {
    const data = await workDayStatisticsService.getOverview(req.user!.userId);

    const groupId = req.query.groupId ? Number(req.query.groupId) : undefined;
    const platform = (req.query.platform as string | undefined) || undefined;
    const keyword = ((req.query.keyword as string | undefined) || '').trim().toLowerCase() || undefined;

    let accounts = data.accounts || [];
    if (groupId) accounts = accounts.filter(a => a.groupId === groupId);
    if (platform) accounts = accounts.filter(a => a.platform === platform);
    if (keyword) {
      accounts = accounts.filter(a =>
        (a.nickname || '').toLowerCase().includes(keyword) ||
        (a.username || '').toLowerCase().includes(keyword)
      );
    }

    // 组装给 Python 的导出数据（列顺序按截图）
    const exportPayload = {
      accounts: accounts.map(a => ({
        account: a.nickname || a.username || '',
        platform: a.platform || '',
        totalViews: a.totalViews,
        yesterdayViews: a.yesterdayViews,
        fansCount: a.fansCount,
        yesterdayComments: a.yesterdayComments ?? 0,
        yesterdayLikes: a.yesterdayLikes ?? 0,
        yesterdayFansIncrease: a.yesterdayFansIncrease ?? 0,
        // 交给 Python 解析为 datetime，避免 Excel 显示 #######
        updateTime: a.updateTime || '',
      })),
    };

    const xlsxBuffer = await runPythonExportXlsx(exportPayload);

    const now = new Date();
    const yyyy = now.getFullYear();
    const mm = String(now.getMonth() + 1).padStart(2, '0');
    const dd = String(now.getDate()).padStart(2, '0');
    const hh = String(now.getHours()).padStart(2, '0');
    const mi = String(now.getMinutes()).padStart(2, '0');
    const ss = String(now.getSeconds()).padStart(2, '0');
    const filename = `work_day_overview_${yyyy}${mm}${dd}_${hh}${mi}${ss}.xlsx`;

    res.setHeader('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
    res.setHeader('Content-Disposition', `attachment; filename="${filename}"`);
    res.send(xlsxBuffer);
  })
);

/**
 * GET /api/work-day-statistics/platform-detail
 * 获取平台详情数据（汇总统计、每日汇总、账号列表）
 *
 * 查询参数：
 * - platform: 平台类型（必填）
 * - startDate: 开始日期（必填）
 * - endDate: 结束日期（必填）
 */
router.get(
  '/platform-detail',
  [
    query('platform').notEmpty().withMessage('platform 不能为空'),
    query('startDate').notEmpty().withMessage('startDate 不能为空'),
    query('endDate').notEmpty().withMessage('endDate 不能为空'),
    validateRequest,
  ],
  asyncHandler(async (req, res) => {
    const { platform, startDate, endDate } = req.query;
    const userId = req.user!.userId;

    const data = await workDayStatisticsService.getPlatformDetail(userId, platform as string, {
      startDate: startDate as string,
      endDate: endDate as string,
    });

    // 调试日志：确认接口是否有每日汇总数据返回
    try {
      logger.info('[WorkDayStatistics] /platform-detail response preview', {
        userId,
        platform,
        startDate,
        endDate,
        dailyCount: data?.dailyData?.length ?? 0,
        firstDailyItems: (data?.dailyData || []).slice(0, 5),
        summary: data?.summary,
      });
    } catch {
      // 日志失败不影响正常返回
    }

    res.json({ success: true, data });
  })
);

export default router;