import { Controller, Post, Body, Get, Param, UseGuards, Request, Sse, MessageEvent, Query } from '@nestjs/common';
import { map } from 'rxjs/operators';
import { AssessmentService } from './assessment.service';
import { CombinedAuthGuard } from '../auth/combined-auth.guard';
import { ApiTags, ApiOperation, ApiResponse } from '@nestjs/swagger';

@ApiTags('Assessment')
@Controller('assessment')
@UseGuards(CombinedAuthGuard)
export class AssessmentController {
    constructor(private readonly assessmentService: AssessmentService) { }

    @Post('start')
    @ApiOperation({ summary: 'Start a new assessment session' })
    async startSession(@Request() req: any, @Body() body: { knowledgeBaseId?: string, language?: string, templateId?: string }) {
        const { id: userId, tenantId } = req.user;
        console.log(`[AssessmentController] startSession: user=${userId}, tenant=${tenantId}, templateId=${body.templateId}, kbId=${body.knowledgeBaseId}`);
        return this.assessmentService.startSession(userId, body.knowledgeBaseId, tenantId, body.language, body.templateId);
    }

    @Post(':id/answer')
    @ApiOperation({ summary: 'Submit an answer to the current question' })
    async submitAnswer(
        @Request() req: any,
        @Param('id') sessionId: string,
        @Body() body: { answer: string, language?: string }
    ) {
        const { id: userId } = req.user;
        console.log(`[AssessmentController] submitAnswer: user=${userId}, session=${sessionId}, answerLen=${body.answer?.length}`);
        return this.assessmentService.submitAnswer(sessionId, userId, body.answer, body.language);
    }

    @Sse(':id/start-stream')
    @ApiOperation({ summary: 'Stream initial session generation' })
    startSessionStream(@Request() req: any, @Param('id') sessionId: string) {
        const { id: userId } = req.user;
        console.log(`[AssessmentController] startSessionStream: user=${userId}, session=${sessionId}`);
        return this.assessmentService.startSessionStream(sessionId, userId).pipe(
            map(data => ({ data } as MessageEvent))
        );
    }

    @Sse(':id/answer-stream')
    @ApiOperation({ summary: 'Stream answer evaluation and next question generation' })
    submitAnswerStream(
        @Request() req: any, 
        @Param('id') sessionId: string, 
        @Query('answer') answer: string,
        @Query('language') language?: string
    ) {
        const { id: userId } = req.user;
        console.log(`[AssessmentController] submitAnswerStream: user=${userId}, session=${sessionId}, lang=${language}`);
        return this.assessmentService.submitAnswerStream(sessionId, userId, answer, language).pipe(
            map(data => ({ data } as MessageEvent))
        );
    }

    @Get(':id/state')
    @ApiOperation({ summary: 'Get the current state of an assessment session' })
    async getSessionState(@Request() req: any, @Param('id') sessionId: string) {
        const { id: userId } = req.user;
        console.log(`[AssessmentController] getSessionState: user=${userId}, session=${sessionId}`);
        return this.assessmentService.getSessionState(sessionId, userId);
    }

    @Get()
    @ApiOperation({ summary: 'Get assessment session history' })
    async getHistory(@Request() req: any) {
        const { id: userId, tenantId } = req.user;
        console.log(`[AssessmentController] getHistory: user=${userId}, tenant=${tenantId}`);
        return this.assessmentService.getHistory(userId, tenantId);
    }
}