import {
  Controller,
  Get,
  Post,
  Put,
  Delete,
  Body,
  Param,
  Query,
  UseGuards,
  Request,
} from '@nestjs/common';
import { DepositsService } from './deposits.service';
import { NotificationsService } from '../notifications/notifications.service';
import { NotificationType } from '../entities/notification.entity';
import { CreateDepositDto, RefundDepositDto, CreateDepositWithInstallmentsDto } from './dto/deposit.dto';
import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
import { OperationLogsService } from '../operation-logs/operation-logs.service';
import { extractRequestInfo } from '../common/request-utils';
import { RequirePermission } from '../auth/decorators/permission.decorator';

@UseGuards(JwtAuthGuard)
@Controller('deposits')
export class DepositsController {
  constructor(
    private service: DepositsService,
    private logService: OperationLogsService,
    private readonly notificationsService: NotificationsService,
  ) {}

  @Get()
  @RequirePermission('deposit:view')
  findAll(@Query('studentId') studentId?: string, @Query('status') status?: string) {
    return this.service.findAll({
      studentId: studentId ? +studentId : undefined,
      status: status || undefined,
    });
  }

  @Get('pending-refunds')
  @RequirePermission('deposit:edit')
  findPendingRefunds() {
    return this.service.findPendingRefunds();
  }

  @Get('stats')
  @RequirePermission('deposit:view')
  getStats() {
    return this.service.getStats();
  }

  @Get(':id')
  @RequirePermission('deposit:view')
  findOne(@Param('id') id: string) {
    return this.service.findOne(+id);
  }

  @Post()
  @RequirePermission('deposit:create')
  async create(@Body() dto: CreateDepositDto | CreateDepositWithInstallmentsDto, @Request() req: any) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const result = await this.service.create(dto, req.user?.id);
    await this.logService.log({
      userId: req.user?.id,
      username: req.user?.username,
      module: '押金管理',
      action: '收取押金',
      targetId: result.id,
      targetType: 'deposit',
      detail: `学生${dto.studentId} ¥${dto.amount}`,
      ipAddress,
      userAgent,
    });
    // TODO: Send notification for deposit_due — studentId→userId mapping unavailable
    return result;
  }

  @Post(':id/installments')
  @RequirePermission('deposit:edit')
  async addInstallment(
    @Param('id') id: string,
    @Body() body: { amount: number; dueDate: string },
  ) {
    return this.service.addInstallment(+id, body.amount, body.dueDate);
  }

  @Put('installments/:installmentId')
  @RequirePermission('deposit:edit')
  async updateInstallment(
    @Param('installmentId') installmentId: string,
    @Body() body: { paidDate?: string; status?: string },
  ) {
    return this.service.updateInstallment(+installmentId, body);
  }

  @Delete('installments/:installmentId')
  @RequirePermission('deposit:delete')
  async deleteInstallment(@Param('installmentId') installmentId: string) {
    return this.service.deleteInstallment(+installmentId);
  }

  @Put(':id/refund')
  @RequirePermission('deposit:edit')
  async refund(@Param('id') id: string, @Body() dto: RefundDepositDto, @Request() req: any) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const result = await this.service.refund(+id, dto, req.user?.id);
    await this.logService.log({
      userId: req.user?.id,
      username: req.user?.username,
      module: '押金管理',
      action: '退还押金',
      targetId: +id,
      targetType: 'deposit',
      detail: `退还¥${result.refundAmount}, 扣除¥${result.deductionAmount}`,
      ipAddress,
      userAgent,
    });
    // TODO: Send notification for deposit_refunded — studentId→userId mapping unavailable
    return result;
  }

  @Post(':id/request-refund')
  @RequirePermission('deposit:edit')
  async requestRefund(@Param('id') id: string, @Request() req: any) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const result = await this.service.requestRefund(+id);
    await this.logService.log({
      userId: req.user?.id,
      username: req.user?.username,
      module: '押金管理',
      action: '申请退款',
      targetId: +id,
      targetType: 'deposit',
      detail: '提交退款申请',
      ipAddress,
      userAgent,
    });
    return result;
  }

  @Put(':id/approve-refund')
  @RequirePermission('deposit:approve')
  async approveRefund(@Param('id') id: string, @Request() req: any) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const result = await this.service.approveRefund(+id, req.user?.id);
    await this.logService.log({
      userId: req.user?.id,
      username: req.user?.username,
      module: '押金管理',
      action: '审批退款',
      targetId: +id,
      targetType: 'deposit',
      detail: `审批通过 → ${result.refundStatus}`,
      ipAddress,
      userAgent,
    });
    return result;
  }

  @Delete(':id')
  @RequirePermission('deposit:delete')
  async remove(@Param('id') id: string, @Request() req: any) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const result = await this.service.remove(+id);
    await this.logService.log({
      userId: req.user?.id,
      username: req.user?.username,
      module: '押金管理',
      action: '删除押金记录',
      targetId: +id,
      targetType: 'deposit',
      ipAddress,
      userAgent,
    });
    return result;
  }
}