import { FastifyRequest, FastifyReply, FastifyInstance } from 'fastify'
import { QrCodeService } from '../services/qr-code.service'
import { ScanRecordService } from '../services/scan-record.service'
import {
  GenerateQrCodeDto,
  QueryQrCodeDto,
  VerifyMaintenanceCodeDto,
  GetQrCodeInfoDto,
  ResetMaintenanceCodeDto,
  AddUserQrCodeDto,
  DeleteUserQrCodeDto,
  QueryUserQrCodeDto,
  UpdateQrCodeDto
} from '../dto/qr-code.dto'

export class QrCodeController {
  private qrCodeService: QrCodeService
  private scanRecordService: ScanRecordService

  constructor(app: FastifyInstance) {
    this.qrCodeService = new QrCodeService(app)
    this.scanRecordService = new ScanRecordService(app)
  }

  /**
   * 生成二维码
   */
  async generate(request: FastifyRequest<{ Body: GenerateQrCodeDto }>, reply: FastifyReply) {
    try {
      const { qrType, quantity } = request.body

      const result = await this.qrCodeService.generateQrCodes(qrType, quantity || 1)

      return reply.code(201).send({
        message: '二维码生成成功',
        data: result
      })
    } catch (error) {
      const message = error instanceof Error ? error.message : '生成失败'
      return reply.code(500).send({ message })
    }
  }

  /**
   * 分页列表
   */
  async list(request: FastifyRequest<{ Querystring: QueryQrCodeDto }>, reply: FastifyReply) {
    try {
      const { qrCode, qrType, isActivated, startDate, endDate, page, pageSize } = request.query

      const result = await this.qrCodeService.queryQrCodes(
        qrCode,
        qrType,
        isActivated,
        startDate,
        endDate,
        page,
        pageSize
      )

      return reply.send(result)
    } catch (error) {
      const message = error instanceof Error ? error.message : '查询失败'
      return reply.code(500).send({ message })
    }
  }

  /**
   * 按日期下载
   */
  async downloadByDate(request: FastifyRequest<{ Querystring: { date: string } }>, reply: FastifyReply) {
    try {
      const { date } = request.query

      if (!date) {
        return reply.code(400).send({ message: '请提供日期参数' })
      }

      const qrCodes = await this.qrCodeService.getQrCodesByDate(date)

      return reply.send({
        date,
        count: qrCodes.length,
        data: qrCodes
      })
    } catch (error) {
      const message = error instanceof Error ? error.message : '下载失败'
      return reply.code(500).send({ message })
    }
  }

  /**
   * 验证维护码
   */
  async verifyMaintenanceCode(request: FastifyRequest<{ Body: VerifyMaintenanceCodeDto }>, reply: FastifyReply) {
    try {
      const { qrCode, maintenanceCode } = request.body

      const isValid = await this.qrCodeService.verifyMaintenanceCode(qrCode, maintenanceCode)

      if (!isValid) {
        return reply.code(401).send({ message: '维护码错误' })
      }

      return reply.send({ message: '验证成功', valid: true })
    } catch (error) {
      const message = error instanceof Error ? error.message : '验证失败'
      return reply.code(500).send({ message })
    }
  }

  /**
   * 验证维护码并返回二维码信息
   */
  async verifyMaintenanceCodeInfo(request: FastifyRequest<{ Body: VerifyMaintenanceCodeDto }>, reply: FastifyReply) {
    try {
      const { qrCode, maintenanceCode } = request.body

      const isValid = await this.qrCodeService.verifyMaintenanceCode(qrCode, maintenanceCode)

      if (!isValid) {
        return reply.code(401).send({ message: '维护码错误' })
      }

      const qrCodeInfo = await this.qrCodeService.getQrCodeInfo(qrCode, undefined, true)

      return reply.send({
        message: '验证成功',
        valid: true,
        ...qrCodeInfo
      })
    } catch (error) {
      const message = error instanceof Error ? error.message : '验证失败'
      return reply.code(500).send({ message })
    }
  }

  /**
   * 前台获取二维码信息
   */
  async getInfo(request: FastifyRequest<{ Querystring: GetQrCodeInfoDto }>, reply: FastifyReply) {
    try {
      const { qrCode, id } = request.query

      if (!qrCode && !id) {
        return reply.code(400).send({ message: '请提供参数' })
      }

      // 记录扫描 - 获取真实IP地址
      let ipAddress = request.headers['x-forwarded-for'] as string
      if (ipAddress) {
        // x-forwarded-for 可能包含多个IP，取第一个（真实客户端IP）
        ipAddress = ipAddress.split(',')[0].trim()
      } else {
        // 如果没有 x-forwarded-for，尝试其他常见的代理头
        ipAddress = (request.headers['x-real-ip'] as string) || 
                   (request.headers['cf-connecting-ip'] as string) ||
                   request.ip || 
                   request.socket.remoteAddress || 
                   'unknown'
      }
      const userAgent = request.headers['user-agent']

      // 如果通过 qrCode 查询，记录扫描
      if (qrCode) {
        await this.scanRecordService.create(qrCode, undefined, undefined, undefined, ipAddress, userAgent)
      }

      // 获取二维码信息
      const info = await this.qrCodeService.getQrCodeInfo(qrCode, id)

      return reply.send(info)
    } catch (error) {
      const message = error instanceof Error ? error.message : '获取信息失败'
      return reply.code(500).send({ message })
    }
  }

  /**
   * 后台获取二维码信息
   */
  async adminGetInfo(request: FastifyRequest<{ Querystring: GetQrCodeInfoDto }>, reply: FastifyReply) {
    try {
      const { qrCode, id } = request.query

      if (!qrCode && !id) {
        return reply.code(400).send({ message: '请提供参数' })
      }

      // 后台查询，不判断 isVisible，返回所有信息
      const info = await this.qrCodeService.getQrCodeInfo(qrCode, id, true)

      return reply.send(info)
    } catch (error) {
      const message = error instanceof Error ? error.message : '获取信息失败'
      return reply.code(500).send({ message })
    }
  }

  /**
   * 获取扫描记录
   */
  async getScanRecords(
    request: FastifyRequest<{ Querystring: { qrCode: string; limit?: number } }>,
    reply: FastifyReply
  ) {
    try {
      const { qrCode, limit } = request.query

      if (!qrCode) {
        return reply.code(400).send({ message: '请提供二维码参数' })
      }

      const records = await this.scanRecordService.getRecentRecords(qrCode, limit || 10)

      return reply.send({
        qrCode,
        count: records.length,
        records
      })
    } catch (error) {
      const message = error instanceof Error ? error.message : '获取记录失败'
      return reply.code(500).send({ message })
    }
  }

  /**
   * 重置维护码
   */
  async resetMaintenanceCode(request: FastifyRequest<{ Body: ResetMaintenanceCodeDto }>, reply: FastifyReply) {
    try {
      const { qrCode, maintenanceCode } = request.body

      const newMaintenanceCode = await this.qrCodeService.resetMaintenanceCode(qrCode, maintenanceCode)

      return reply.send({
        message: '维护码重置成功',
        data: {
          qrCode,
          maintenanceCode: newMaintenanceCode
        }
      })
    } catch (error) {
      const message = error instanceof Error ? error.message : '重置失败'
      return reply.code(500).send({ message })
    }
  }

  /**
   * 绑定二维码
   */
  async bindQrCode(request: FastifyRequest<{ Body: AddUserQrCodeDto }>, reply: FastifyReply) {
    try {
      const userId = request.user.id
      const { qrCodeId, qrCode, maintenanceCode } = request.body

      const userQrCode = await this.qrCodeService.bindQrCode(userId, qrCodeId, qrCode, maintenanceCode)

      return reply.code(201).send({
        message: 'Bound successfully'
      })
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Binding failed'
      const clientErrorKeywords = [
        'not found',
        'already bound',
        'Please provide',
        'Maintenance code cannot be empty',
        'Maintenance code error'
      ]
      const isClientError = clientErrorKeywords.some(keyword => message.includes(keyword))
      const statusCode = isClientError ? 400 : 500
      return reply.code(statusCode).send({ message })
    }
  }

  /**
   * 取消绑定二维码
   */
  async unbindQrCode(request: FastifyRequest<{ Body: DeleteUserQrCodeDto }>, reply: FastifyReply) {
    try {
      const userId = request.user.id
      const { id, qrCodeId } = request.body

      await this.qrCodeService.unbindQrCode(userId, id, qrCodeId)

      return reply.send({
        message: 'Unbound successfully'
      })
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Unbinding failed'
      const statusCode =
        message.includes('not found') || message.includes('already deleted') || message.includes('Please provide') ? 400 : 500
      return reply.code(statusCode).send({ message })
    }
  }

  /**
   * 查询用户的关联二维码列表
   */
  async getUserQrCodes(request: FastifyRequest<{ Querystring: QueryUserQrCodeDto }>, reply: FastifyReply) {
    try {
      const userId = request.user.id
      const { page = 0, pageSize = 20 } = request.query

      const result = await this.qrCodeService.getUserQrCodes(userId, page, pageSize)

      return reply.send(result)
    } catch (error) {
      const message = error instanceof Error ? error.message : 'Query failed'
      return reply.code(500).send({ message })
    }
  }

  /**
   * 更新二维码信息
   */
  async update(request: FastifyRequest<{ Body: UpdateQrCodeDto }>, reply: FastifyReply) {
    try {
      const { qrCode, maintenanceCode, remark } = request.body

      const updated = await this.qrCodeService.updateQrCode(qrCode, maintenanceCode, { remark })

      return reply.send({
        message: '更新成功',
        data: {
          qrCode: updated.qrCode,
          remark: updated.remark
        }
      })
    } catch (error) {
      const message = error instanceof Error ? error.message : '更新失败'
      const clientErrorKeywords = ['维护码错误', '二维码不存在']
      const isClientError = clientErrorKeywords.some(keyword => message.includes(keyword))
      const statusCode = isClientError ? 400 : 500
      return reply.code(statusCode).send({ message })
    }
  }
}