import { Body, Delete, Get, Path, Post, Put, Request, Response, Route, Security, SuccessResponse, Tags } from 'tsoa';
import { ValidationError } from '../middleware/errorHandler';
import { ChaptersLessonService } from '../services/ChaptersLesson.service';
import {
    CreateChapterResponse,
    UpdateChapterResponse,
    DeleteChapterResponse,
    ReorderChapterResponse,
    GetLessonResponse,
    CreateLessonResponse,
    UpdateLessonResponse,
    DeleteLessonResponse,
    ReorderLessonsResponse,
    AddQuestionResponse,
    UpdateQuestionResponse,
    DeleteQuestionResponse,
    CreateChapterBody,
    UpdateChapterBody,
    ReorderChapterBody,
    CreateLessonBody,
    UpdateLessonBody,
    ReorderLessonsBody,
    AddQuestionBody,
    UpdateQuestionBody,
} from '../types/ChaptersLesson.typs';

const chaptersLessonService = new ChaptersLessonService();

@Route('api/instructors/courses/{courseId}')
@Tags('ChaptersLessons - Instructor')
export class ChaptersLessonInstructorController {

    // ============================================
    // Chapter Endpoints
    // Note: Use CoursesInstructorController.getMyCourse to get chapters with full details
    // ============================================

    /**
     * สร้าง chapter ใหม่
     * Create a new chapter
     */
    @Post('chapters')
    @Security('jwt', ['instructor'])
    @SuccessResponse('201', 'Chapter created successfully')
    @Response('401', 'Unauthorized')
    @Response('403', 'Forbidden')
    public async createChapter(
        @Request() request: any,
        @Path() courseId: number,
        @Body() body: CreateChapterBody
    ): Promise<CreateChapterResponse> {
        const token = request.headers.authorization?.replace('Bearer ', '');
        if (!token) throw new ValidationError('No token provided');
        return await chaptersLessonService.createChapter({
            token,
            course_id: courseId,
            title: body.title,
            description: body.description,
            sort_order: body.sort_order,
        });
    }

    /**
     * อัปเดต chapter
     * Update a chapter
     */
    @Put('chapters/{chapterId}')
    @Security('jwt', ['instructor'])
    @SuccessResponse('200', 'Chapter updated successfully')
    @Response('401', 'Unauthorized')
    @Response('403', 'Forbidden')
    @Response('404', 'Chapter not found')
    public async updateChapter(
        @Request() request: any,
        @Path() courseId: number,
        @Path() chapterId: number,
        @Body() body: UpdateChapterBody
    ): Promise<UpdateChapterResponse> {
        const token = request.headers.authorization?.replace('Bearer ', '');
        if (!token) throw new ValidationError('No token provided');
        return await chaptersLessonService.updateChapter({
            token,
            course_id: courseId,
            chapter_id: chapterId,
            ...body,
        });
    }

    /**
     * ลบ chapter
     * Delete a chapter
     */
    @Delete('chapters/{chapterId}')
    @Security('jwt', ['instructor'])
    @SuccessResponse('200', 'Chapter deleted successfully')
    @Response('401', 'Unauthorized')
    @Response('403', 'Forbidden')
    @Response('404', 'Chapter not found')
    public async deleteChapter(
        @Request() request: any,
        @Path() courseId: number,
        @Path() chapterId: number
    ): Promise<DeleteChapterResponse> {
        const token = request.headers.authorization?.replace('Bearer ', '');
        if (!token) throw new ValidationError('No token provided');
        return await chaptersLessonService.deleteChapter({ token, course_id: courseId, chapter_id: chapterId });
    }

    /**
     * เรียงลำดับ chapter ใหม่
     * Reorder chapter
     */
    @Put('chapters/{chapterId}/reorder')
    @Security('jwt', ['instructor'])
    @SuccessResponse('200', 'Chapter reordered successfully')
    public async reorderChapter(
        @Request() request: any,
        @Path() courseId: number,
        @Path() chapterId: number,
        @Body() body: ReorderChapterBody
    ): Promise<ReorderChapterResponse> {
        const token = request.headers.authorization?.replace('Bearer ', '');
        if (!token) throw new ValidationError('No token provided');
        return await chaptersLessonService.reorderChapter({
            token,
            course_id: courseId,
            chapter_id: chapterId,
            sort_order: body.sort_order,
        });
    }

    // ============================================
    // Lesson Endpoints
    // ============================================

    /**
     * ดึงข้อมูล lesson พร้อม attachments และ quiz
     * Get lesson with attachments and quiz
     */
    @Get('chapters/{chapterId}/lessons/{lessonId}')
    @Security('jwt', ['instructor'])
    @SuccessResponse('200', 'Lesson retrieved successfully')
    public async getLesson(
        @Request() request: any,
        @Path() courseId: number,
        @Path() chapterId: number,
        @Path() lessonId: number
    ): Promise<GetLessonResponse> {
        const token = request.headers.authorization?.replace('Bearer ', '');
        if (!token) throw new ValidationError('No token provided');
        return await chaptersLessonService.getLesson({ token, course_id: courseId, chapter_id: chapterId, lesson_id: lessonId });
    }

    /**
     * สร้าง lesson ใหม่ (สำหรับ QUIZ จะสร้าง quiz shell อัตโนมัติ)
     * Create a new lesson (for QUIZ type, quiz shell is created automatically)
     */
    @Post('chapters/{chapterId}/lessons')
    @Security('jwt', ['instructor'])
    @SuccessResponse('201', 'Lesson created successfully')
    public async createLesson(
        @Request() request: any,
        @Path() courseId: number,
        @Path() chapterId: number,
        @Body() body: CreateLessonBody
    ): Promise<CreateLessonResponse> {
        const token = request.headers.authorization?.replace('Bearer ', '');
        if (!token) throw new ValidationError('No token provided');
        return await chaptersLessonService.createLesson({
            token,
            course_id: courseId,
            chapter_id: chapterId,
            title: body.title,
            content: body.content,
            type: body.type,
            sort_order: body.sort_order,
        });
    }

    /**
     * อัปเดต lesson
     * Update a lesson
     */
    @Put('chapters/{chapterId}/lessons/{lessonId}')
    @Security('jwt', ['instructor'])
    @SuccessResponse('200', 'Lesson updated successfully')
    public async updateLesson(
        @Request() request: any,
        @Path() courseId: number,
        @Path() chapterId: number,
        @Path() lessonId: number,
        @Body() body: UpdateLessonBody
    ): Promise<UpdateLessonResponse> {
        const token = request.headers.authorization?.replace('Bearer ', '');
        if (!token) throw new ValidationError('No token provided');
        return await chaptersLessonService.updateLesson({
            token,
            course_id: courseId,
            chapter_id: chapterId,
            lesson_id: lessonId,
            data: body,
        });
    }

    // ============================================
    // Video Upload Endpoints (multipart/form-data)
    // Note: These endpoints should be registered with express router 
    // using multer middleware for actual file upload handling.
    // See: src/routes/lessons.routes.ts (to be created)
    // ============================================

    /**
     * ลบ lesson
     * Delete a lesson (cannot delete if published)
     */
    @Delete('chapters/{chapterId}/lessons/{lessonId}')
    @Security('jwt', ['instructor'])
    @SuccessResponse('200', 'Lesson deleted successfully')
    public async deleteLesson(
        @Request() request: any,
        @Path() courseId: number,
        @Path() chapterId: number,
        @Path() lessonId: number
    ): Promise<DeleteLessonResponse> {
        const token = request.headers.authorization?.replace('Bearer ', '');
        if (!token) throw new ValidationError('No token provided');
        return await chaptersLessonService.deleteLesson({ token, course_id: courseId, chapter_id: chapterId, lesson_id: lessonId });
    }

    /**
     * เรียงลำดับ lessons ใน chapter
     * Reorder lessons within a chapter
     */
    @Put('chapters/{chapterId}/lessons/reorder')
    @Security('jwt', ['instructor'])
    @SuccessResponse('200', 'Lessons reordered successfully')
    public async reorderLessons(
        @Request() request: any,
        @Path() courseId: number,
        @Path() chapterId: number,
        @Body() body: ReorderLessonsBody
    ): Promise<ReorderLessonsResponse> {
        const token = request.headers.authorization?.replace('Bearer ', '');
        if (!token) throw new ValidationError('No token provided');
        return await chaptersLessonService.reorderLessons({
            token,
            course_id: courseId,
            chapter_id: chapterId,
            lesson_id: body.lesson_id,
            sort_order: body.sort_order,
        });
    }

    // ============================================
    // Quiz Question Endpoints
    // ============================================

    /**
     * เพิ่มคำถามให้ quiz lesson
     * Add a question to a quiz lesson
     */
    @Post('chapters/{chapterId}/lessons/{lessonId}/questions')
    @Security('jwt', ['instructor'])
    @SuccessResponse('201', 'Question added successfully')
    public async addQuestion(
        @Request() request: any,
        @Path() courseId: number,
        @Path() chapterId: number,
        @Path() lessonId: number,
        @Body() body: AddQuestionBody
    ): Promise<AddQuestionResponse> {
        const token = request.headers.authorization?.replace('Bearer ', '');
        if (!token) throw new ValidationError('No token provided');
        return await chaptersLessonService.addQuestion({
            token,
            course_id: courseId,
            lesson_id: lessonId,
            ...body,
        });
    }

    /**
     * อัปเดตคำถาม
     * Update a question
     */
    @Put('chapters/{chapterId}/lessons/{lessonId}/questions/{questionId}')
    @Security('jwt', ['instructor'])
    @SuccessResponse('200', 'Question updated successfully')
    public async updateQuestion(
        @Request() request: any,
        @Path() courseId: number,
        @Path() chapterId: number,
        @Path() lessonId: number,
        @Path() questionId: number,
        @Body() body: UpdateQuestionBody
    ): Promise<UpdateQuestionResponse> {
        const token = request.headers.authorization?.replace('Bearer ', '');
        if (!token) throw new ValidationError('No token provided');
        return await chaptersLessonService.updateQuestion({
            token,
            course_id: courseId,
            lesson_id: lessonId,
            question_id: questionId,
            ...body,
        });
    }

    /**
     * ลบคำถาม
     * Delete a question
     */
    @Delete('chapters/{chapterId}/lessons/{lessonId}/questions/{questionId}')
    @Security('jwt', ['instructor'])
    @SuccessResponse('200', 'Question deleted successfully')
    public async deleteQuestion(
        @Request() request: any,
        @Path() courseId: number,
        @Path() chapterId: number,
        @Path() lessonId: number,
        @Path() questionId: number
    ): Promise<DeleteQuestionResponse> {
        const token = request.headers.authorization?.replace('Bearer ', '');
        if (!token) throw new ValidationError('No token provided');
        return await chaptersLessonService.deleteQuestion({
            token,
            course_id: courseId,
            lesson_id: lessonId,
            question_id: questionId,
        });
    }
}