import { prisma } from '../config/database';
import { Prisma } from '@prisma/client';
import { config } from '../config';
import { logger } from '../config/logger';
import { listCourseResponse, getCourseResponse } from '../types/courses.types';
import { UnauthorizedError, ValidationError, ForbiddenError } from '../middleware/errorHandler';

export class CoursesService {
    async ListCourses(category_id?: number): Promise<listCourseResponse> {
        try {
            const where: Prisma.CourseWhereInput = {};

            if (category_id) {
                where.category_id = category_id;
            }

            const courses = await prisma.course.findMany({ where });
            return {
                code: 200,
                message: 'Courses fetched successfully',
                total: courses.length,
                data: courses,

            };
        } catch (error) {
            logger.error('Failed to fetch courses', { error });
            throw error;
        }
    }

    async GetCourseById(id: number): Promise<getCourseResponse> {
        try {
            const course = await prisma.course.findUnique({ where: { id } });
            return {
                code: 200,
                message: 'Course fetched successfully',
                data: course,

            };
        } catch (error) {
            logger.error('Failed to fetch course', { error });
            throw error;
        }
    }
}