import {
  Controller,
  Get,
  Post,
  Put,
  Delete,
  Body,
  Param,
  Query,
  UseGuards,
  UsePipes,
  ValidationPipe,
  Req,
  Logger,
} from '@nestjs/common';
import { QuestionBankService } from '../services/question-bank.service';
import {
  CreateQuestionBankDto,
  UpdateQuestionBankDto,
  CreateQuestionBankItemDto,
  UpdateQuestionBankItemDto,
  ReviewDto,
} from '../services/question-bank.service';
import { CombinedAuthGuard } from '../../auth/combined-auth.guard';
import { KnowledgeGroupService } from '../../knowledge-group/knowledge-group.service';

@Controller('question-banks')
@UseGuards(CombinedAuthGuard)
@UsePipes(ValidationPipe)
export class QuestionBankController {
  private readonly logger = new Logger(QuestionBankController.name);

  constructor(
    private readonly questionBankService: QuestionBankService,
    private readonly groupService: KnowledgeGroupService,
  ) {}

  @Post()
  async create(@Body() createDto: CreateQuestionBankDto, @Req() req: any) {
    try {
      this.logger.log(`Creating question bank: ${createDto.name}, user: ${req.user?.id}, tenant: ${req.user?.tenantId}`);
      return await this.questionBankService.create(createDto, req.user.id, req.user.tenantId);
    } catch (err: any) {
      this.logger.error(`[create] Failed: ${err.message}`, err.stack);
      throw err;
    }
  }

  @Get()
  findAll(
    @Req() req: any,
    @Query('page') page?: string,
    @Query('limit') limit?: string,
  ) {
    const pageNum = page ? parseInt(page, 10) : undefined;
    const limitNum = limit ? parseInt(limit, 10) : undefined;
    return this.questionBankService.findAll(
      req.user.id,
      req.user.tenantId,
      pageNum,
      limitNum,
    );
  }

  @Get('by-template/:templateId')
  async findByTemplateId(@Param('templateId') templateId: string) {
    return this.questionBankService.findByTemplateId(templateId);
  }

  @Get(':id')
  async findOne(@Param('id') id: string) {
    return this.questionBankService.findOne(id);
  }

  @Put(':id')
  async update(@Param('id') id: string, @Body() updateDto: UpdateQuestionBankDto) {
    return this.questionBankService.update(id, updateDto);
  }

  @Delete(':id')
  async remove(@Param('id') id: string) {
    return this.questionBankService.remove(id);
  }

  @Put(':id/submit')
  async submitForReview(@Param('id') id: string, @Req() req: any) {
    return this.questionBankService.submitForReview(id, req.user.id);
  }

  @Put(':id/review')
  async review(@Param('id') id: string, @Body() reviewDto: ReviewDto, @Req() req: any) {
    return this.questionBankService.review(id, reviewDto, req.user.id);
  }

  @Put(':id/publish')
  async publish(@Param('id') id: string) {
    return this.questionBankService.publish(id);
  }

  @Get(':bankId/items')
  async getItems(@Param('bankId') bankId: string) {
    const bank = await this.questionBankService.findOne(bankId);
    return bank.items || [];
  }

  @Post(':bankId/items')
  async addItem(
    @Param('bankId') bankId: string,
    @Body() createDto: CreateQuestionBankItemDto,
  ) {
    return this.questionBankService.addItem(bankId, createDto);
  }

  @Put(':bankId/items/:id')
  async updateItem(
    @Param('bankId') bankId: string,
    @Param('id') id: string,
    @Body() updateDto: UpdateQuestionBankItemDto,
  ) {
    return this.questionBankService.updateItem(bankId, id, updateDto);
  }

  @Delete(':bankId/items/:id')
  async removeItem(
    @Param('bankId') bankId: string,
    @Param('id') id: string,
  ) {
    return this.questionBankService.removeItem(bankId, id);
  }

  @Post(':bankId/generate')
  async generate(
    @Param('bankId') bankId: string,
    @Body() body: { count: number; knowledgeBaseContent?: string },
    @Req() req: any,
  ) {
    let content = body.knowledgeBaseContent || '';
    if (!content || content.trim().length < 10) {
      try {
        const bank = await this.questionBankService.findOne(bankId);
        if (bank?.template?.knowledgeGroupId) {
          const files = await this.groupService.getGroupFiles(
            bank.template.knowledgeGroupId,
            req.user.id,
            req.user.tenantId,
          );
          content = files
            .filter((f: any) => f.content && f.content.trim().length > 0)
            .map((f: any) => `--- ${f.title || f.originalName || 'Document'} ---\n${f.content}`)
            .join('\n\n');
          this.logger.log(`[generate] Auto-loaded ${files.length} files, content length: ${content.length}`);
        }
      } catch (err: any) {
        this.logger.warn(`[generate] Auto-load failed: ${err.message}`);
      }
    }

    this.logger.log(`[generate] Generating ${body.count} questions for bank ${bankId}, content length: ${content.length}`);
    return this.questionBankService.generateQuestions(
      bankId,
      body.count,
      content,
      req.user.tenantId,
    );
  }

  @Post(':bankId/items/batch-review')
  async batchReviewItems(
    @Param('bankId') bankId: string,
    @Body() body: { itemIds: string[]; approved: boolean; comment?: string },
  ) {
    this.logger.log(`[batchReview] Reviewing ${body.itemIds.length} items, approved: ${body.approved}`);
    return this.questionBankService.batchReviewItems(
      bankId,
      body.itemIds,
      body.approved,
      body.comment,
    );
  }
}