import {
  Controller,
  Get,
  Post,
  Patch,
  Put,
  Param,
  Query,
  Body,
  Req,
  UseGuards,
  ParseUUIDPipe,
  ForbiddenException,
  NotFoundException,
  BadRequestException,
  Logger,
  UseInterceptors,
  UploadedFile,
} from '@nestjs/common';
import { FileInterceptor } from '@nestjs/platform-express';
import { ApiTags, ApiBearerAuth, ApiOperation, ApiQuery } from '@nestjs/swagger';
import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard';
import { TaService } from './ta.service';
import { SupabaseService } from '../../database/supabase.service';
import { IngestSignalDto } from './dto/ingest-signal.dto';
import { AnalyzeAtRiskQueryDto } from './dto/analyze-at-risk.dto';
import { GenerateQuizDto, UpdateQuizDto, SendQuizDto, SubmitAttemptDto } from './dto/quiz.dto';

interface RequestWithUser extends Request {
  user: { id: string };
}

@ApiTags('TA Dashboard')
@Controller('ta')
export class TaController {
  private readonly logger = new Logger(TaController.name);

  constructor(
    private readonly taService: TaService,
    private readonly supabaseService: SupabaseService,
  ) {}

  private async checkTaPermission(spaceId: string, userId: string) {
    const { data: member, error } = await this.supabaseService
      .from('space_members')
      .select('role')
      .eq('space_id', spaceId)
      .eq('user_id', userId)
      .single();

    if (error || !member || (member.role !== 'owner' && member.role !== 'admin')) {
      const { data: space } = await this.supabaseService
        .from('spaces')
        .select('owner_id')
        .eq('id', spaceId)
        .single();

      if (space?.owner_id === userId) return;
      throw new ForbiddenException('Chỉ Owner hoặc Admin mới có quyền truy cập Dashboard');
    }
  }

  private async checkSpaceMembership(spaceId: string, userId: string) {
    const { data: member } = await this.supabaseService
      .from('space_members')
      .select('role')
      .eq('space_id', spaceId)
      .eq('user_id', userId)
      .single();

    if (!member) {
      throw new ForbiddenException('Bạn không phải là thành viên của không gian này');
    }
  }

  @ApiOperation({ summary: '[TEST] Tạo dữ liệu Stress Test' })
  @Post('test/generate-stress-data')
  async generateStressData(@Query('spaceId', ParseUUIDPipe) spaceId: string) {
    return this.taService.generateStressTestData(spaceId);
  }

  @UseGuards(JwtAuthGuard)
  @ApiBearerAuth()
  @Post('scan-at-risk')
  async scanAtRisk(@Req() req: RequestWithUser, @Query('spaceId', ParseUUIDPipe) spaceId: string) {
    await this.checkTaPermission(spaceId, req.user.id);
    return await this.taService.scanAtRiskStudents(spaceId);
  }

  @ApiOperation({ summary: 'Thu nạp tín hiệu rủi ro' })
  @Post('ingest-signal')
  async ingestSignal(@Req() req: RequestWithUser, @Body() dto: IngestSignalDto) {
    await this.checkTaPermission(dto.space_id, req.user.id);
    return await this.taService.ingestSignal(dto);
  }

  @ApiOperation({ summary: 'Lấy danh sách học viên có nguy cơ' })
  @Get('at-risk')
  async getAtRisk(@Req() req: RequestWithUser, @Query('spaceId', ParseUUIDPipe) spaceId: string) {
    await this.checkTaPermission(spaceId, req.user.id);
    const data = await this.taService.getAtRiskList(spaceId);
    return { success: true, data };
  }

  @ApiOperation({ summary: 'Phân tích real-time signals từ chat messages' })
  @Post('at-risk/analyze')
  async analyzeAtRisk(@Req() req: RequestWithUser, @Query() dto: AnalyzeAtRiskQueryDto) {
    await this.checkTaPermission(dto.spaceId, req.user.id);
    const hours = dto.hours ?? 168;
    const data = await this.taService.analyzeAtRiskSignals(dto.spaceId, hours);
    return data;
  }

  @ApiOperation({ summary: 'Đánh dấu đã giải quyết cảnh báo' })
  @Post('at-risk/:id/resolve')
  async resolveAlert(@Req() req: RequestWithUser, @Param('id', ParseUUIDPipe) snapshotId: string, @Query('spaceId', ParseUUIDPipe) spaceId: string) {
    await this.checkTaPermission(spaceId, req.user.id);
    const data = await this.taService.resolveAlert(snapshotId, req.user.id, spaceId);
    return { success: true, data };
  }

  @ApiOperation({ summary: 'Lấy hàng chờ duyệt tóm tắt AI' })
  @Get('summary-queue')
  async getSummaryQueue(@Req() req: RequestWithUser, @Query('spaceId', ParseUUIDPipe) spaceId: string) {
    await this.checkTaPermission(spaceId, req.user.id);
    const data = await this.taService.getSummaryQueue(spaceId);
    return { success: true, data };
  }

  @ApiOperation({ summary: 'Duyệt bản tóm tắt AI' })
  @Post('summary-queue/:id/approve')
  async approveSummary(@Req() req: RequestWithUser, @Param('id', ParseUUIDPipe) draftId: string, @Query('spaceId', ParseUUIDPipe) spaceId: string) {
    await this.checkTaPermission(spaceId, req.user.id);
    const data = await this.taService.approveSummary(draftId, req.user.id, spaceId);
    return { success: true, data };
  }

  @ApiOperation({ summary: 'Đặt lịch gửi bản tóm tắt AI' })
  @Post('summary-queue/:id/schedule')
  async scheduleSummary(@Req() req: RequestWithUser, @Param('id', ParseUUIDPipe) draftId: string, @Query('spaceId', ParseUUIDPipe) spaceId: string, @Body('scheduled_at') scheduledAt: string) {
    await this.checkTaPermission(spaceId, req.user.id);
    const data = await this.taService.scheduleSummary(draftId, scheduledAt, req.user.id);
    return { success: true, data };
  }

  @ApiOperation({ summary: 'Hủy đặt lịch' })
  @Post('summary-queue/:id/cancel-schedule')
  async cancelSchedule(@Req() req: RequestWithUser, @Param('id', ParseUUIDPipe) draftId: string, @Query('spaceId', ParseUUIDPipe) spaceId: string) {
    await this.checkTaPermission(spaceId, req.user.id);
    const data = await this.taService.cancelSchedule(draftId);
    return { success: true, data };
  }

  @ApiOperation({ summary: 'Cập nhật bản thảo' })
  @Patch('summary-queue/:id')
  async updateSummaryDraft(@Req() req: RequestWithUser, @Param('id', ParseUUIDPipe) draftId: string, @Query('spaceId', ParseUUIDPipe) spaceId: string, @Body() updates: Record<string, unknown>) {
    await this.checkTaPermission(spaceId, req.user.id);
    const data = await this.taService.updateSummaryDraft(draftId, updates);
    return { success: true, data };
  }

  @ApiOperation({ summary: 'Gửi tin nhắn riêng thông minh' })
  @Post('send-smart-message')
  async sendSmartMessage(@Req() req: RequestWithUser, @Query('spaceId', ParseUUIDPipe) spaceId: string, @Body() dto: { studentId: string, content: string, snapshotId?: string }) {
    await this.checkTaPermission(spaceId, req.user.id);
    return this.taService.sendSmartMessage({ taId: req.user.id, spaceId, ...dto });
  }

  @ApiOperation({ summary: 'AI: Tạo bản thảo tóm tắt' })
  @Post('summary-queue/draft')
  async createSummaryDraft(@Req() req: RequestWithUser, @Body() dto: { spaceId: string; content: string; draft_type?: string; metadata?: Record<string, unknown> }) {
    if (dto.spaceId) await this.checkTaPermission(dto.spaceId, req.user.id);
    const data = await this.taService.createSummaryDraft(dto);
    return { success: true, data };
  }

  @ApiOperation({ summary: 'Lấy nhật ký hành động' })
  @Get('action-logs')
  async getActionLogs(@Req() req: RequestWithUser, @Query('spaceId', ParseUUIDPipe) spaceId: string) {
    await this.checkTaPermission(spaceId, req.user.id);
    const data = await this.taService.getActionLogs(spaceId);
    return { success: true, data };
  }

  @ApiOperation({ summary: 'Lấy bộ Context cho Agent' })
  @Get('at-risk-context/:snapshotId')
  async getAtRiskContext(@Req() req: RequestWithUser, @Param('snapshotId', ParseUUIDPipe) snapshotId: string, @Query('spaceId', ParseUUIDPipe) spaceId: string) {
    await this.checkTaPermission(spaceId, req.user.id);
    const data = await this.taService.getAtRiskContext(snapshotId);
    return { success: true, data };
  }

  @ApiOperation({ summary: 'Tải lên slide' })
  @Post('upload-slide')
  @UseInterceptors(FileInterceptor('file'))
  async uploadSlide(@Req() req: RequestWithUser, @UploadedFile() file: Express.Multer.File, @Query('spaceId', ParseUUIDPipe) spaceId: string) {
    await this.checkTaPermission(spaceId, req.user.id);
    const data = await this.taService.saveLectureSlide(spaceId, file, req.user.id);
    return { success: true, data };
  }

  @ApiOperation({ summary: 'AI: Index PDF vào Qdrant' })
  @Post('agent/index-pdf')
  @UseInterceptors(FileInterceptor('file'))
  async indexPdf(@Req() req: RequestWithUser, @UploadedFile() file: Express.Multer.File, @Body() body: { spaceId: string; conversationId: string }) {
    await this.checkTaPermission(body.spaceId, req.user.id);

    if (!file.mimetype?.includes('pdf')) {
      throw new BadRequestException('Chỉ chấp nhận file PDF.');
    }

    return await this.taService.indexPdfToQdrant(body.spaceId, file, body.conversationId);
  }

  @ApiOperation({ summary: 'AI: Gọi Agent Chat' })
  @Post('agent/chat')
  async callAgentChat(@Req() req: RequestWithUser, @Body() body: { spaceId: string; query: string; senderId: string }) {
    await this.checkTaPermission(body.spaceId, req.user.id);
    return await this.taService.callAgentChat(body.spaceId, body.query, body.senderId);
  }

  @ApiOperation({ summary: 'AI: Gọi Agent với File' })
  @ApiQuery({ name: 'spaceId', type: String, description: 'ID của không gian' })
  @ApiQuery({ name: 'query', type: String, required: false, description: 'Câu hỏi về file' })
  @ApiQuery({ name: 'conversationId', type: String, required: false, description: 'ID conversation FastAPI' })
  @Post('agent/chat-with-file')
  @UseInterceptors(FileInterceptor('file'))
  async callAgentWithFile(
    @Req() req: RequestWithUser,
    @UploadedFile() file: Express.Multer.File,
    @Query('spaceId', ParseUUIDPipe) spaceId: string,
    @Query('query') query: string,
    @Query('conversationId') conversationId?: string
  ) {
    await this.checkTaPermission(spaceId, req.user.id);
    return await this.taService.callAgentWithFile(spaceId, query, req.user.id, file, conversationId);
  }

  @ApiOperation({ summary: 'AI: Tạo bản thảo tin nhắn thông minh' })
  @Get('agent/smart-message/:snapshotId')
  async generateSmartMessage(@Req() req: RequestWithUser, @Param('snapshotId', ParseUUIDPipe) snapshotId: string, @Query('tone') tone: string, @Query('instruction') instruction?: string, @Query('pronouns') pronouns?: string, @Query('taName') taName?: string) {
    return this.taService.generateSmartMessage(snapshotId, tone, req.user.id, { instruction, pronouns, taName });
  }

  @ApiOperation({ summary: 'At-Risk: Lấy settings (weights, thresholds)' })
  @Get('at-risk/settings')
  async getAtRiskSettings(@Req() req: RequestWithUser, @Query('spaceId', ParseUUIDPipe) spaceId: string) {
    await this.checkTaPermission(spaceId, req.user.id);
    return this.taService.getAtRiskSettingsForUi(spaceId);
  }

  @ApiOperation({ summary: 'At-Risk: Cập nhật settings (weights, thresholds)' })
  @Post('at-risk/settings')
  async updateAtRiskSettings(@Req() req: RequestWithUser, @Body() body: { spaceId: string; weights?: { last_seen: number; fastapi_signals: number; quiz_avg_score: number }; thresholds?: { warning: number; critical: number } }) {
    await this.checkTaPermission(body.spaceId, req.user.id);
    return this.taService.updateAtRiskSettings(body.spaceId, body.weights, body.thresholds, req.user.id);
  }

  // ==========================================
  // QUIZ ENDPOINTS
  // ==========================================

  @ApiOperation({ summary: 'AI: Tạo quiz từ bài giảng' })
  @Post('quiz/generate')
  async generateQuiz(@Req() req: RequestWithUser, @Body() dto: GenerateQuizDto) {
    if (dto.space_id) await this.checkTaPermission(dto.space_id, req.user.id);
    return await this.taService.generateQuiz(dto, req.user.id);
  }

  @ApiOperation({ summary: 'List quizzes for TA by space' })
  @Get('quizzes')
  async listQuizzes(@Req() req: RequestWithUser, @Query('spaceId', ParseUUIDPipe) spaceId: string) {
    await this.checkTaPermission(spaceId, req.user.id);
    return await this.taService.listQuizzes(spaceId);
  }

  @ApiOperation({ summary: 'Get quiz chi tiết (edit mode)' })
  @Get('quiz/:id')
  async getQuiz(@Req() req: RequestWithUser, @Param('id', ParseUUIDPipe) quizId: string) {
    const { data: quiz } = await this.supabaseService.from('quizzes').select('space_id').eq('id', quizId).single();
    if (quiz) await this.checkTaPermission(quiz.space_id, req.user.id);
    return await this.taService.getQuiz(quizId, req.user.id);
  }

  @ApiOperation({ summary: 'Cập nhật quiz' })
  @Put('quiz/:id')
  async updateQuiz(@Req() req: RequestWithUser, @Param('id', ParseUUIDPipe) quizId: string, @Body() dto: UpdateQuizDto) {
    const { data: quiz } = await this.supabaseService.from('quizzes').select('space_id').eq('id', quizId).single();
    if (quiz) await this.checkTaPermission(quiz.space_id, req.user.id);
    return await this.taService.updateQuiz(quizId, dto, req.user.id);
  }

  @ApiOperation({ summary: 'Gửi quiz vào chat' })
  @Post('quiz/:id/send')
  async sendQuiz(@Req() req: RequestWithUser, @Param('id', ParseUUIDPipe) quizId: string, @Body() dto: SendQuizDto) {
    if (dto.space_id) await this.checkTaPermission(dto.space_id, req.user.id);
    return await this.taService.sendQuizToChat(quizId, dto, req.user.id);
  }

  @ApiOperation({ summary: 'Get quiz cho học viên làm' })
  @Get('quiz/:id/student')
  async getQuizForStudent(@Req() req: RequestWithUser, @Param('id', ParseUUIDPipe) quizId: string) {
    const { data: quiz } = await this.supabaseService.from('quizzes').select('space_id').eq('id', quizId).single();
    if (!quiz) throw new NotFoundException('Quiz not found');
    await this.checkSpaceMembership(quiz.space_id, req.user.id);
    return await this.taService.getQuizForStudent(quizId, req.user.id);
  }

  @ApiOperation({ summary: 'Submit quiz attempt' })
  @Post('quiz/:id/submit')
  async submitQuizAttempt(@Req() req: RequestWithUser, @Param('id', ParseUUIDPipe) quizId: string, @Body() dto: SubmitAttemptDto) {
    const { data: quiz } = await this.supabaseService.from('quizzes').select('space_id').eq('id', quizId).single();
    if (!quiz) throw new NotFoundException('Quiz not found');
    await this.checkSpaceMembership(quiz.space_id, req.user.id);
    return await this.taService.submitQuizAttempt(quizId, req.user.id, dto);
  }

  @ApiOperation({ summary: 'Get quiz summary (TA)' })
  @Get('quiz/:id/summary')
  async getQuizSummary(@Req() req: RequestWithUser, @Param('id', ParseUUIDPipe) quizId: string) {
    const { data: quiz } = await this.supabaseService.from('quizzes').select('space_id').eq('id', quizId).single();
    if (quiz) await this.checkTaPermission(quiz.space_id, req.user.id);
    return await this.taService.getQuizSummary(quizId, req.user.id);
  }
}