import {
  Controller,
  Get,
  Post,
  Put,
  Delete,
  Body,
  Param,
  Query,
  UseGuards,
  Request,
} from '@nestjs/common';
import { SchedulesService } from './schedules.service';
import {
  CreateScheduleDto,
  UpdateScheduleDto,
  QueryScheduleDto,
  WeeklyViewQueryDto,
} from './dto/schedule.dto';
import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
import { OperationLogsService } from '../operation-logs/operation-logs.service';
import { extractRequestInfo } from '../common/request-utils';
import { ConflictException } from '@nestjs/common';
import { NotificationsService } from '../notifications/notifications.service';
import { NotificationType } from '../entities/notification.entity';
import { RequirePermission } from '../auth/decorators/permission.decorator';

@UseGuards(JwtAuthGuard)
@Controller('class-schedules')
export class SchedulesController {
  constructor(
    private readonly service: SchedulesService,
    private readonly logService: OperationLogsService,
    private readonly notificationsService: NotificationsService,
  ) {}

  @Get()
  @RequirePermission('schedule:view')
  findAll(@Query() query: QueryScheduleDto) {
    return this.service.findAll(query);
  }

  @Get('weekly')
  @RequirePermission('schedule:view')
  getWeeklyView(@Query() query: WeeklyViewQueryDto) {
    return this.service.getWeeklyView(query);
  }

  @Get('classroom/:id/occupancy')
  @RequirePermission('schedule:view')
  getClassroomOccupancy(
    @Param('id') id: string,
    @Query('date') date?: string,
  ) {
    return this.service.getClassroomOccupancy(+id, date);
  }

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

  @Post()
  @RequirePermission('schedule:create')
  async create(@Body() dto: CreateScheduleDto, @Request() req: { user?: { id: number; username: string }; headers?: Record<string, string> }) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    try {
      const result = await this.service.create(dto);
      await this.logService.log({
        userId: req.user?.id,
        username: req.user?.username,
        module: '排课管理',
        action: '创建排课',
        targetId: result.id,
        targetType: 'class-schedule',
        detail: `${result.subject} 周${result.weekDay} ${result.startTime}-${result.endTime}`,
        ipAddress,
        userAgent,
      });
      return result;
    } catch (error) {
      if (error instanceof ConflictException) {
        try {
          const conflicts = await this.service.checkConflict(
            dto.classroomId, dto.weekDay, dto.startTime, dto.endTime, dto.startDate, dto.endDate,
          );
          const teacherIds = [...new Set(conflicts.map(c => c.teacherId).filter((id): id is number => id != null))];
          if (teacherIds.length > 0) {
            void this.notificationsService.create({
              recipientIds: teacherIds,
              type: NotificationType.SCHEDULE_CONFLICT,
              title: '排课冲突',
              content: `教室${dto.classroomId} 周${dto.weekDay} ${dto.startTime}-${dto.endTime} 与已有排课冲突`,
            });
          }
        } catch {}
      }
      throw error;
    }
  }

  @Put(':id')
  @RequirePermission('schedule:edit')
  async update(
    @Param('id') id: string,
    @Body() dto: UpdateScheduleDto,
    @Request() req: { user?: { id: number; username: string }; headers?: Record<string, string> },
  ) {
    const { ipAddress, userAgent } = extractRequestInfo(req);
    const existing = await this.service.findOne(+id);
    try {
      const result = await this.service.update(+id, dto);
      await this.logService.log({
        userId: req.user?.id,
        username: req.user?.username,
        module: '排课管理',
        action: '编辑排课',
        targetId: +id,
        targetType: 'class-schedule',
        detail: JSON.stringify(dto),
        ipAddress,
        userAgent,
      });
      return result;
    } catch (error) {
      if (error instanceof ConflictException) {
        try {
          const conflicts = await this.service.checkConflict(
            existing.classroomId, existing.weekDay, existing.startTime, existing.endTime, existing.startDate, existing.endDate,
          );
          const teacherIds = [...new Set(conflicts.map(c => c.teacherId).filter((id): id is number => id != null))];
          if (teacherIds.length > 0) {
            void this.notificationsService.create({
              recipientIds: teacherIds,
              type: NotificationType.SCHEDULE_CONFLICT,
              title: '排课冲突',
              content: `教室${existing.classroomId} 周${existing.weekDay} ${existing.startTime}-${existing.endTime} (更新) 与已有排课冲突`,
            });
          }
        } catch {}
      }
      throw error;
    }
  }

  @Delete(':id')
  @RequirePermission('schedule:delete')
  async remove(@Param('id') id: string, @Request() req: { user?: { id: number; username: string }; headers?: Record<string, string> }) {
    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: '排课管理',
      action: '删除排课',
      targetId: +id,
      targetType: 'class-schedule',
      ipAddress,
      userAgent,
    });
    return result;
  }
}