import { Router, Request, Response, NextFunction } from 'express'
import bcrypt from 'bcryptjs'
import multer from 'multer'
import path from 'path'
import fs from 'fs'
import jwt from 'jsonwebtoken'
import prisma from '../lib/prisma'
import { signAccessToken, verifyAccessToken } from '../lib/jwt'
import { authMiddleware, AuthRequest } from '../middleware/auth'
import { portalLoginSchema, portalSendCodeSchema, portalVerifyCodeSchema, onboardingSchema, contractConfirmSchema, contractSendCodeSchema } from '../schemas/portal.schema'
import { setCode, getCode, deleteCode, updateCode, checkRateLimit } from '../lib/codeStore'
import { createEvidence } from '../services/evidence.service'

const router = Router()

// 员工端认证中间件
function portalAuth(req: Request, res: Response, next: NextFunction) {
  const authHeader = req.headers.authorization
  if (!authHeader?.startsWith('Bearer ')) {
    return res.status(401).json({ success: false, error: { code: 'UNAUTHORIZED', message: '未登录' } })
  }
  const token = authHeader.substring(7)
  try {
    const payload = verifyAccessToken(token)
    if (!payload || payload.role !== 'EMPLOYEE') {
      return res.status(401).json({ success: false, error: { code: 'UNAUTHORIZED', message: '无效的员工端 Token' } })
    }
    ;(req as any).employee = { id: payload.id, orgId: payload.orgId }
    next()
  } catch {
    return res.status(401).json({ success: false, error: { code: 'UNAUTHORIZED', message: 'Token 无效或已过期' } })
  }
}

// 密码登录
router.post('/login', async (req, res, next) => {
  try {
    const data = portalLoginSchema.parse(req.body)
    const employee = await prisma.employee.findFirst({
      where: { phone: data.phone, status: 'ACTIVE' },
    })
    if (!employee || !employee.passwordHash) {
      return res.status(400).json({ success: false, error: { code: 'AUTH_FAILED', message: '手机号或密码错误' } })
    }
    const valid = await bcrypt.compare(data.password, employee.passwordHash)
    if (!valid) {
      return res.status(400).json({ success: false, error: { code: 'AUTH_FAILED', message: '手机号或密码错误' } })
    }
    const token = signAccessToken({ id: employee.id, orgId: employee.orgId, role: 'EMPLOYEE' })
    res.json({ success: true, data: { token, employee: { id: employee.id, name: employee.name, department: employee.department } } })
  } catch (err) {
    next(err)
  }
})

// 发送验证码（页面内显示）
router.post('/send-code', async (req, res, next) => {
  try {
    const data = portalSendCodeSchema.parse(req.body)
    const employee = await prisma.employee.findFirst({
      where: { phone: data.phone, status: 'ACTIVE' },
    })
    if (!employee) {
      return res.status(400).json({ success: false, error: { code: 'NOT_FOUND', message: '该手机号未在系统中登记' } })
    }
    // 频率限制：60秒内不可重复发送
    const allowed = await checkRateLimit(data.phone)
    if (!allowed) {
      return res.status(429).json({ success: false, error: { code: 'RATE_LIMIT', message: '验证码发送过于频繁，请60秒后重试' } })
    }
    const code = Math.random().toString().slice(2, 8)
    await setCode(data.phone, code)
    res.json({ success: true, data: { code, message: '验证码已生成（开发阶段直接返回，生产环境将发送短信）' } })
  } catch (err) {
    next(err)
  }
})

// 验证码登录
router.post('/verify-code', async (req, res, next) => {
  try {
    const data = portalVerifyCodeSchema.parse(req.body)
    const stored = await getCode(data.phone)
    if (!stored) {
      return res.status(400).json({ success: false, error: { code: 'CODE_EXPIRED', message: '验证码已过期，请重新获取' } })
    }
    // 错误次数限制：5次后锁定
    if (stored.failCount >= 5) {
      await deleteCode(data.phone)
      return res.status(400).json({ success: false, error: { code: 'TOO_MANY_ATTEMPTS', message: '验证码错误次数过多，请重新获取验证码' } })
    }
    if (stored.code !== data.code) {
      await updateCode(data.phone, { failCount: stored.failCount + 1 })
      return res.status(400).json({ success: false, error: { code: 'CODE_WRONG', message: `验证码错误（剩余${5 - stored.failCount - 1}次机会）` } })
    }
    await deleteCode(data.phone)
    const employee = await prisma.employee.findFirst({ where: { phone: data.phone, status: 'ACTIVE' } })
    if (!employee) {
      return res.status(400).json({ success: false, error: { code: 'NOT_FOUND', message: '员工不存在' } })
    }
    const token = signAccessToken({ id: employee.id, orgId: employee.orgId, role: 'EMPLOYEE' })
    res.json({ success: true, data: { token, employee: { id: employee.id, name: employee.name, department: employee.department } } })
  } catch (err) {
    next(err)
  }
})

// 工资条
router.get('/payslip', portalAuth, async (req: any, res, next) => {
  try {
    const month = req.query.month as string || new Date().toISOString().slice(0, 7)
    const payslip = await prisma.payslip.findFirst({
      where: { employeeId: req.employee.id, orgId: req.employee.orgId, month, publishStatus: 'PUBLISHED' },
    })
    if (!payslip) {
      return res.json({ success: true, data: null })
    }
    res.json({ success: true, data: payslip })
  } catch (err) {
    next(err)
  }
})

// 工资条历史（最近6个月）
router.get('/payslip/history', portalAuth, async (req: any, res, next) => {
  try {
    const payslips = await prisma.payslip.findMany({
      where: { employeeId: req.employee.id, orgId: req.employee.orgId, publishStatus: 'PUBLISHED' },
      orderBy: { month: 'desc' },
      take: 6,
    })
    res.json({ success: true, data: payslips })
  } catch (err) {
    next(err)
  }
})

// 工资条确认已阅
router.post('/payslip/:id/confirm', portalAuth, async (req: any, res, next) => {
  try {
    const payslip = await prisma.payslip.findFirst({
      where: { id: req.params.id, orgId: req.employee.orgId, employeeId: req.employee.id },
      include: { employee: true },
    })
    if (!payslip) {
      return res.status(404).json({ success: false, error: { code: 'NOT_FOUND', message: '工资条不存在' } })
    }
    await prisma.payslip.update({
      where: { id: req.params.id },
      data: { confirmedAt: new Date(), confirmedIp: req.ip },
    })
    // 通知 HR
    await prisma.notificationLog.create({
      data: {
        orgId: req.employee.orgId,
        title: '工资条确认通知',
        content: `员工 ${payslip.employee.name} 已确认 ${payslip.month} 月工资条（IP: ${req.ip}）`,
        type: 'PAYSLIP_CONFIRM',
        channel: 'IN_APP',
      },
    })
    await createEvidence({
      orgId: req.employee.orgId,
      category: 'PAYSLIP_CONFIRM',
      refId: payslip.id,
      employeeId: req.employee.id,
      events: [{ action: '工资条确认', timestamp: new Date().toISOString(), ip: req.ip, userAgent: req.headers['user-agent'] }],
      createdBy: req.employee.id,
    }).catch(() => {})
    res.json({ success: true })
  } catch (err) {
    next(err)
  }
})

// 我的合同
router.get('/contract', portalAuth, async (req: any, res, next) => {
  try {
    const contract = await prisma.laborContract.findFirst({
      where: { employeeId: req.employee.id, orgId: req.employee.orgId },
      orderBy: { createdAt: 'desc' },
    })
    if (!contract) {
      return res.json({ success: true, data: null })
    }
    res.json({ success: true, data: contract })
  } catch (err) {
    next(err)
  }
})

// 入职填报提交
router.post('/onboarding', async (req, res, next) => {
  try {
    const data = onboardingSchema.parse(req.body)
    const link = await prisma.onboardingLink.findFirst({
      where: { token: data.token, status: 'PENDING', expiresAt: { gt: new Date() } },
    })
    if (!link) {
      return res.status(400).json({ success: false, error: { code: 'LINK_INVALID', message: '链接无效或已过期' } })
    }
    await prisma.onboardingLink.update({
      where: { id: link.id },
      data: {
        employeeName: data.name,
        phone: data.phone,
        formData: {
          name: data.name,
          phone: data.phone,
          idCard: data.idCard,
          emergencyContact: data.emergencyContact,
          emergencyPhone: data.emergencyPhone,
          address: data.address,
          bankCard: data.bankCard,
          bankName: data.bankName,
        },
        status: 'APPROVED',
        usedAt: new Date(),
      },
    })
    res.json({ success: true, data: { message: '信息提交成功，HR 将审核您的信息' } })
  } catch (err) {
    next(err)
  }
})

// 合同签署验证码发送
router.post('/contract-confirm/send-code', async (req, res, next) => {
  try {
    const data = contractSendCodeSchema.parse(req.body)
    const link = await prisma.contractConfirmLink.findFirst({
      where: { token: data.token, status: 'UNCONFIRMED', expiresAt: { gt: new Date() } },
      include: { contract: { include: { employee: true } } },
    })
    if (!link) {
      return res.status(400).json({ success: false, error: { code: 'LINK_INVALID', message: '链接无效或已过期' } })
    }
    const phone = link.contract.employee.phone
    if (!phone) {
      return res.status(400).json({ success: false, error: { code: 'NO_PHONE', message: '员工手机号未登记，无法发送验证码' } })
    }
    const code = Math.random().toString().slice(2, 8)
    await setCode(`contract-${data.token}`, code)
    res.json({ success: true, data: { code, message: '验证码已生成（开发阶段直接返回，生产环境将发送短信）' } })
  } catch (err) {
    next(err)
  }
})

// 合同签署确认
router.post('/contract-confirm', async (req, res, next) => {
  try {
    const data = contractConfirmSchema.parse(req.body)
    const link = await prisma.contractConfirmLink.findFirst({
      where: { token: data.token, status: 'UNCONFIRMED', expiresAt: { gt: new Date() } },
      include: { contract: { include: { employee: true } } },
    })
    if (!link) {
      return res.status(400).json({ success: false, error: { code: 'LINK_INVALID', message: '链接无效或已过期' } })
    }
    // 验证码校验
    const stored = await getCode(`contract-${data.token}`)
    if (!stored) {
      return res.status(400).json({ success: false, error: { code: 'CODE_EXPIRED', message: '验证码已过期，请重新获取' } })
    }
    if (stored.failCount >= 5) {
      await deleteCode(`contract-${data.token}`)
      return res.status(400).json({ success: false, error: { code: 'TOO_MANY_ATTEMPTS', message: '验证码错误次数过多，请重新获取验证码' } })
    }
    if (stored.code !== data.verifyCode) {
      await updateCode(`contract-${data.token}`, { failCount: stored.failCount + 1 })
      return res.status(400).json({ success: false, error: { code: 'CODE_WRONG', message: `验证码错误（剩余${5 - stored.failCount - 1}次机会）` } })
    }
    await deleteCode(`contract-${data.token}`)

    const userAgent = req.headers['user-agent'] || ''
    const signEvidence = JSON.stringify({
      ip: req.ip,
      userAgent,
      timestamp: new Date().toISOString(),
    })
    await prisma.contractConfirmLink.update({
      where: { id: link.id },
      data: { status: 'CONFIRMED', confirmedAt: new Date(), confirmedIp: req.ip },
    })
    await prisma.laborContract.update({
      where: { id: link.contractId },
      data: { attachmentName: `confirmed:${new Date().toISOString()}|evidence:${signEvidence}` },
    })
    await createEvidence({
      orgId: link.contract.orgId,
      category: 'CONTRACT_SIGN',
      refId: link.contractId,
      employeeId: link.contract.employeeId,
      events: [{ action: '合同签署确认', timestamp: new Date().toISOString(), ip: req.ip, userAgent, smsCode: data.verifyCode }],
      createdBy: link.contract.employeeId,
    }).catch(() => {})
    res.json({ success: true, data: { message: '合同签署确认成功' } })
  } catch (err) {
    next(err)
  }
})

// 获取入职填报信息（通过 token）
router.get('/onboarding/:token', async (req, res, next) => {
  try {
    const link = await prisma.onboardingLink.findFirst({
      where: { token: req.params.token, status: 'PENDING', expiresAt: { gt: new Date() } },
      include: { org: { select: { name: true } } },
    })
    if (!link) {
      return res.status(400).json({ success: false, error: { code: 'LINK_INVALID', message: '链接无效或已过期' } })
    }
    res.json({ success: true, data: { orgName: link.org.name } })
  } catch (err) {
    next(err)
  }
})

// 撤回入职链接（HR 端调用，需要认证）
router.post('/onboarding/:id/revoke', portalAuth, async (req: any, res, next) => {
  try {
    const link = await prisma.onboardingLink.findFirst({
      where: { id: req.params.id, orgId: req.employee.orgId },
    })
    if (!link) {
      return res.status(404).json({ success: false, error: { code: 'NOT_FOUND', message: '链接不存在' } })
    }
    if (link.status !== 'PENDING') {
      return res.status(400).json({ success: false, error: { code: 'INVALID_STATUS', message: '仅待填报状态的链接可撤回' } })
    }
    await prisma.onboardingLink.update({
      where: { id: link.id },
      data: { status: 'CANCELLED' },
    })
    res.json({ success: true, data: { message: '入职链接已撤回' } })
  } catch (err) {
    next(err)
  }
})

// 获取合同确认信息（通过 token）
router.get('/contract-confirm/:token', async (req, res, next) => {
  try {
    const link = await prisma.contractConfirmLink.findFirst({
      where: { token: req.params.token, status: 'UNCONFIRMED', expiresAt: { gt: new Date() } },
      include: {
        contract: {
          include: {
            employee: { select: { name: true, org: { select: { name: true } } } },
          },
        },
      },
    })
    if (!link) {
      return res.status(400).json({ success: false, error: { code: 'LINK_INVALID', message: '链接无效或已过期' } })
    }
    res.json({
      success: true,
      data: {
        orgName: link.contract.employee.org.name,
        employeeName: link.contract.employee.name,
        contract: link.contract,
      },
    })
  } catch (err) {
    next(err)
  }
})

// 重发合同确认链接（HR 端调用，需要认证）
router.post('/contract-confirm/:id/resend', portalAuth, async (req: any, res, next) => {
  try {
    const link = await prisma.contractConfirmLink.findFirst({
      where: { id: req.params.id, orgId: req.employee.orgId },
      include: { contract: { include: { employee: true } } },
    })
    if (!link) {
      return res.status(404).json({ success: false, error: { code: 'NOT_FOUND', message: '链接不存在' } })
    }
    if (link.status === 'CONFIRMED') {
      return res.status(400).json({ success: false, error: { code: 'ALREADY_CONFIRMED', message: '合同已确认，无需重发' } })
    }
    // 生成新 token 并延长过期时间
    const crypto = await import('crypto')
    const newToken = crypto.randomUUID()
    await prisma.contractConfirmLink.update({
      where: { id: link.id },
      data: {
        token: newToken,
        expiresAt: new Date(Date.now() + 7 * 24 * 60 * 60 * 1000),
        status: 'UNCONFIRMED',
      },
    })
    res.json({ success: true, data: { token: newToken, message: '确认链接已重发，有效期7天' } })
  } catch (err) {
    next(err)
  }
})

// 入职文件上传
const uploadDir = path.join(process.cwd(), 'uploads', 'onboarding')
if (!fs.existsSync(uploadDir)) fs.mkdirSync(uploadDir, { recursive: true })

const onboardingUpload = multer({
  storage: multer.diskStorage({
    destination: uploadDir,
    filename: (_req, file, cb) => {
      const ext = path.extname(file.originalname)
      cb(null, `${Date.now()}-${Math.random().toString(36).slice(2, 8)}${ext}`)
    },
  }),
  limits: { fileSize: 10 * 1024 * 1024 },
  fileFilter: (_req, file, cb) => {
    const allowed = ['.jpg', '.jpeg', '.png', '.pdf', '.bmp']
    const ext = path.extname(file.originalname).toLowerCase()
    if (allowed.includes(ext)) cb(null, true)
    else cb(new Error('仅支持 JPG/PNG/PDF/BMP 格式'))
  },
})

router.post('/onboarding/:token/upload', onboardingUpload.single('file'), async (req, res, next) => {
  try {
    if (!req.file) {
      return res.status(400).json({ success: false, error: { code: 'NO_FILE', message: '请选择文件' } })
    }
    const link = await prisma.onboardingLink.findFirst({
      where: { token: req.params.token, status: 'PENDING', expiresAt: { gt: new Date() } },
    })
    if (!link) {
      fs.unlinkSync(req.file.path)
      return res.status(400).json({ success: false, error: { code: 'LINK_INVALID', message: '链接无效或已过期' } })
    }
    const fileType = (req.body.fileType as string) || 'OTHER'
    const fileUrl = `/uploads/onboarding/${req.file.filename}`
    res.json({ success: true, data: { fileName: req.file.originalname, fileUrl, fileType, fileSize: req.file.size } })
  } catch (err) {
    next(err)
  }
})

// ========== 员工端：规章制度公示 ==========

/** 获取已公示制度列表（含当前员工阅读状态） */
router.get('/policies', portalAuth, async (req: Request, res: Response, next: NextFunction) => {
  try {
    const { orgId, id: employeeId } = (req as any).employee
    const policies = await prisma.policyDocument.findMany({
      where: { orgId, status: 'PUBLISHED' },
      orderBy: { publishedAt: 'desc' },
      select: {
        id: true,
        title: true,
        type: true,
        publishedAt: true,
        readRecords: {
          where: { employeeId },
          select: { id: true, readAt: true },
        },
      },
    })
    const result = policies.map(p => ({
      id: p.id,
      title: p.title,
      type: p.type,
      publishedAt: p.publishedAt?.toISOString() || null,
      hasRead: p.readRecords.length > 0,
      readAt: p.readRecords[0]?.readAt?.toISOString() || null,
    }))
    res.json({ success: true, data: result })
  } catch (err) {
    next(err)
  }
})

/** 获取制度详情（已公示） */
router.get('/policies/:id', portalAuth, async (req: Request, res: Response, next: NextFunction) => {
  try {
    const { orgId, id: employeeId } = (req as any).employee
    const policy = await prisma.policyDocument.findFirst({
      where: { id: req.params.id, orgId, status: 'PUBLISHED' },
      select: {
        id: true,
        title: true,
        content: true,
        type: true,
        publishedAt: true,
        readRecords: {
          where: { employeeId },
          select: { id: true, readAt: true },
        },
      },
    })
    if (!policy) {
      return res.status(404).json({ success: false, error: { code: 'NOT_FOUND', message: '制度不存在或未公示' } })
    }
    res.json({
      success: true,
      data: {
        id: policy.id,
        title: policy.title,
        content: policy.content,
        type: policy.type,
        publishedAt: policy.publishedAt?.toISOString() || null,
        hasRead: policy.readRecords.length > 0,
        readAt: policy.readRecords[0]?.readAt?.toISOString() || null,
      },
    })
  } catch (err) {
    next(err)
  }
})

/** 提交阅读确认（签收） */
router.post('/policies/:id/read', portalAuth, async (req: Request, res: Response, next: NextFunction) => {
  try {
    const { orgId, id: employeeId } = (req as any).employee
    const policy = await prisma.policyDocument.findFirst({
      where: { id: req.params.id, orgId, status: 'PUBLISHED' },
      select: { id: true },
    })
    if (!policy) {
      return res.status(404).json({ success: false, error: { code: 'NOT_FOUND', message: '制度不存在或未公示' } })
    }

    // 幂等：已存在则返回已有记录
    const existing = await prisma.policyReadRecord.findUnique({
      where: { policyId_employeeId: { policyId: req.params.id, employeeId } },
    })
    if (existing) {
      return res.json({ success: true, data: { readAt: existing.readAt.toISOString() } })
    }

    const record = await prisma.policyReadRecord.create({
      data: {
        policyId: req.params.id,
        orgId,
        employeeId,
        ip: req.ip || req.socket.remoteAddress,
        userAgent: req.headers['user-agent'] || null,
      },
    })
    res.json({ success: true, data: { readAt: record.readAt.toISOString() } })
  } catch (err) {
    next(err)
  }
})

// ========== 一次性自动登录 ==========

const AUTO_LOGIN_SECRET = process.env.JWT_SECRET || 'dev-secret'

/**
 * 管理端生成员工一次性自动登录 token（10 分钟有效）
 * POST /portal/auto-login-token  body: { employeeId }
 */
router.post('/auto-login-token', authMiddleware, async (req: AuthRequest, res, next) => {
  try {
    const { employeeId } = req.body
    if (!employeeId) {
      return res.status(400).json({ success: false, error: { code: 'BAD_REQUEST', message: '缺少 employeeId' } })
    }
    const employee = await prisma.employee.findFirst({
      where: { id: employeeId, orgId: req.user!.orgId, status: 'ACTIVE' },
      select: { id: true, name: true, phone: true, orgId: true },
    })
    if (!employee) {
      return res.status(404).json({ success: false, error: { code: 'NOT_FOUND', message: '员工不存在或已离职' } })
    }
    const token = jwt.sign(
      { id: employee.id, orgId: employee.orgId, role: 'EMPLOYEE_AUTO', name: employee.name },
      AUTO_LOGIN_SECRET,
      { expiresIn: '10m' }
    )
    res.json({ success: true, data: { token, employeeName: employee.name, phone: employee.phone } })
  } catch (err) {
    next(err)
  }
})

/**
 * 员工端自动登录（消费一次性 token）
 * GET /portal/auto-login?token=xxx
 */
router.get('/auto-login', async (req, res, next) => {
  try {
    const { token } = req.query
    if (!token || typeof token !== 'string') {
      return res.status(400).json({ success: false, error: { code: 'BAD_REQUEST', message: '缺少 token' } })
    }
    let payload: any
    try {
      payload = jwt.verify(token, AUTO_LOGIN_SECRET)
    } catch {
      return res.status(401).json({ success: false, error: { code: 'TOKEN_EXPIRED', message: '链接已过期，请重新扫码' } })
    }
    if (payload.role !== 'EMPLOYEE_AUTO') {
      return res.status(401).json({ success: false, error: { code: 'TOKEN_INVALID', message: '无效的登录链接' } })
    }
    const employee = await prisma.employee.findFirst({
      where: { id: payload.id, orgId: payload.orgId, status: 'ACTIVE' },
      select: { id: true, name: true, department: true, orgId: true },
    })
    if (!employee) {
      return res.status(404).json({ success: false, error: { code: 'NOT_FOUND', message: '员工不存在或已离职' } })
    }
    const accessToken = signAccessToken({ id: employee.id, orgId: employee.orgId, role: 'EMPLOYEE' })
    res.json({ success: true, data: { token: accessToken, employee: { id: employee.id, name: employee.name, department: employee.department } } })
  } catch (err) {
    next(err)
  }
})

// 员工端查看自己的月度考勤
router.get('/attendance', portalAuth, async (req: any, res, next) => {
  try {
    const month = req.query.month as string || new Date().toISOString().slice(0, 7)
    // 检查该月份是否已发布
    const publish = await (prisma as any).attendancePublish.findFirst({
      where: { orgId: req.employee.orgId, month, status: 'PUBLISHED' },
    })
    if (!publish) {
      return res.json({ success: true, data: { published: false, records: [] } })
    }
    // 查询该月考勤记录
    const startDate = new Date(`${month}-01`)
    const endDate = new Date(startDate)
    endDate.setMonth(endDate.getMonth() + 1)
    const records = await prisma.attendanceRecord.findMany({
      where: {
        employeeId: req.employee.id,
        orgId: req.employee.orgId,
        date: { gte: startDate, lt: endDate },
      },
      orderBy: { date: 'asc' },
    })
    res.json({ success: true, data: { published: true, records, title: publish.title } })
  } catch (err) {
    next(err)
  }
})

export default router