import {
  Body,
  Controller,
  Delete,
  Get,
  HttpCode,
  HttpStatus,
  Param,
  Patch,
  Post,
  Query,
} from '@nestjs/common';
import { ApiOperation, ApiTags } from '@nestjs/swagger';
import { LearningService } from './learning.service';
import { CreateLearningPathDto } from './dto/create-learning-path.dto';
import { UpdateLearningPathDto } from './dto/update-learning-path.dto';
import { CreateLessonDto } from './dto/create-lesson.dto';
import { UpdateLessonDto } from './dto/update-lesson.dto';
import { RecordReviewDto } from './dto/record-review.dto';
import { QueryLearningPathsDto } from './dto/query-learning-paths.dto';
import { QueryLessonsDto } from './dto/query-lessons.dto';
import type { LearningPath } from './entities/learning-path.entity';
import type { Lesson } from './entities/lesson.entity';
import type { LessonProgress } from './entities/lesson-progress.entity';
import type { ReviewLog } from './entities/review-log.entity';
import type { PaginatedResponse } from '@common/pagination.dto';
import type { LearningDueResponse, LearningPathStats } from '@life-platform/shared';

@ApiTags('Learning')
@Controller('learning')
export class LearningController {
  constructor(private readonly learningService: LearningService) {}

  // --- Paths ---

  @Get('paths')
  @ApiOperation({ summary: 'List learning paths' })
  findAllPaths(@Query() query: QueryLearningPathsDto): Promise<PaginatedResponse<LearningPath>> {
    return this.learningService.findAllPaths(query as QueryLearningPathsDto & Record<string, unknown>);
  }

  @Get('paths/:id')
  @ApiOperation({ summary: 'Get learning path with lessons and progress' })
  findOnePath(@Param('id') id: string): Promise<LearningPath> {
    return this.learningService.findOnePath(id);
  }

  @Post('paths')
  @ApiOperation({ summary: 'Create learning path' })
  createPath(@Body() dto: CreateLearningPathDto): Promise<LearningPath> {
    return this.learningService.createPath(dto);
  }

  @Patch('paths/:id')
  @ApiOperation({ summary: 'Update learning path' })
  updatePath(@Param('id') id: string, @Body() dto: UpdateLearningPathDto): Promise<LearningPath> {
    return this.learningService.updatePath(id, dto);
  }

  @Delete('paths/:id')
  @HttpCode(HttpStatus.NO_CONTENT)
  @ApiOperation({ summary: 'Delete learning path' })
  removePath(@Param('id') id: string): Promise<void> {
    return this.learningService.removePath(id);
  }

  @Get('paths/:id/stats')
  @ApiOperation({ summary: 'Get learning path completion stats' })
  getPathStats(@Param('id') id: string): Promise<LearningPathStats> {
    return this.learningService.getPathStats(id);
  }

  @Get('paths/:id/lessons')
  @ApiOperation({ summary: 'List lessons in a learning path' })
  findPathLessons(
    @Param('id') id: string,
    @Query() query: QueryLessonsDto,
  ): Promise<PaginatedResponse<Lesson>> {
    return this.learningService.findLessons({
      ...query,
      learningPathId: id,
    } as QueryLessonsDto & Record<string, unknown>);
  }

  // --- Lessons ---

  @Post('lessons')
  @ApiOperation({ summary: 'Create lesson' })
  createLesson(@Body() dto: CreateLessonDto): Promise<Lesson> {
    return this.learningService.createLesson(dto);
  }

  @Get('lessons/:id')
  @ApiOperation({ summary: 'Get lesson with progress' })
  findOneLesson(@Param('id') id: string): Promise<Lesson> {
    return this.learningService.findOneLesson(id);
  }

  @Patch('lessons/:id')
  @ApiOperation({ summary: 'Update lesson' })
  updateLesson(@Param('id') id: string, @Body() dto: UpdateLessonDto): Promise<Lesson> {
    return this.learningService.updateLesson(id, dto);
  }

  @Delete('lessons/:id')
  @HttpCode(HttpStatus.NO_CONTENT)
  @ApiOperation({ summary: 'Delete lesson' })
  removeLesson(@Param('id') id: string): Promise<void> {
    return this.learningService.removeLesson(id);
  }

  @Post('lessons/:id/review')
  @ApiOperation({ summary: 'Record a review (SM-2 update)' })
  recordReview(@Param('id') id: string, @Body() dto: RecordReviewDto): Promise<LessonProgress> {
    return this.learningService.recordReview(id, dto);
  }

  @Get('lessons/:id/reviews')
  @ApiOperation({ summary: 'Review history for a lesson' })
  getReviewHistory(@Param('id') id: string): Promise<ReviewLog[]> {
    return this.learningService.getReviewHistory(id);
  }

  // --- Due / Stats ---

  @Get('due')
  @ApiOperation({ summary: "What's due for review now?" })
  getDue(@Query('limit') limit?: string): Promise<LearningDueResponse> {
    return this.learningService.getDue(limit ? parseInt(limit, 10) : undefined);
  }

  @Get('stats')
  @ApiOperation({ summary: 'Stats across all active learning paths' })
  getAllStats(): Promise<LearningPathStats[]> {
    return this.learningService.getAllPathStats();
  }
}