sno-quiz/backend/internal/handlers/question_handler.go

package handlers

import (
	"log"
	"sno/internal/models"
	"sno/internal/service"
	"strconv"

	"github.com/gofiber/fiber/v2"
)

// QuestionHandler handles HTTP requests for questions.
type QuestionHandler struct {
	questionService service.QuestionService
}

// NewQuestionHandler creates a new instance of a question handler.
func NewQuestionHandler(questionService service.QuestionService) *QuestionHandler {
	return &QuestionHandler{questionService: questionService}
}

// CreateQuestion handles the request to add a new question to a quiz.
// @Summary Create question
// @Description Adds a new question to a quiz (admin/operator only)
// @Tags questions
// @Accept json
// @Produce json
// @Param quiz_id path int true "Quiz ID"
// @Param question body models.Question true "Question object"
// @Success 201 {object} object{success=bool,message=string,data=models.Question}
// @Failure 400 {object} object{success=bool,message=string}
// @Failure 500 {object} object{success=bool,message=string}
// @Router /api/admin/quizzes/{quiz_id}/questions [post]
// @Security ApiKeyAuth
func (h *QuestionHandler) CreateQuestion(c *fiber.Ctx) error {
	quizID, err := strconv.Atoi(c.Params("quiz_id"))
	if err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(Response{
			Success: false,
			Message: "Invalid quiz ID",
		})
	}

	var question models.Question
	if err := c.BodyParser(&question); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(Response{
			Success: false,
			Message: "Cannot parse JSON",
		})
	}

	// Set the QuizID from the URL parameter
	question.QuizID = quizID

	createdQuestion, err := h.questionService.CreateQuestion(c.Context(), &question)
	if err != nil {
		log.Printf("ERROR: Failed to create question: %v", err)
		return c.Status(fiber.StatusInternalServerError).JSON(Response{
			Success: false,
			Message: err.Error(), // Return the actual validation error message
		})
	}

	return c.Status(fiber.StatusCreated).JSON(Response{
		Success: true,
		Message: "Question created successfully",
		Data:    createdQuestion,
	})
}

// UpdateQuestion handles the request to update an existing question.
// @Summary Update question
// @Description Updates an existing question (admin/operator only)
// @Tags questions
// @Accept json
// @Produce json
// @Param quiz_id path int true "Quiz ID"
// @Param question_id path int true "Question ID"
// @Param question body models.Question true "Updated question object"
// @Success 200 {object} object{success=bool,message=string,data=models.Question}
// @Failure 400 {object} object{success=bool,message=string}
// @Failure 500 {object} object{success=bool,message=string}
// @Router /api/admin/quizzes/{quiz_id}/questions/{question_id} [put]
// @Security ApiKeyAuth
func (h *QuestionHandler) UpdateQuestion(c *fiber.Ctx) error {
	quizID, err := strconv.Atoi(c.Params("quiz_id"))
	if err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(Response{
			Success: false,
			Message: "Invalid quiz ID",
		})
	}

	questionID, err := strconv.Atoi(c.Params("question_id"))
	if err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(Response{
			Success: false,
			Message: "Invalid question ID",
		})
	}

	var question models.Question
	if err := c.BodyParser(&question); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(Response{
			Success: false,
			Message: "Cannot parse JSON",
		})
	}

	// Ensure the question belongs to the specified quiz
	question.QuizID = quizID

	updatedQuestion, err := h.questionService.UpdateQuestion(c.Context(), questionID, &question)
	if err != nil {
		log.Printf("ERROR: Failed to update question: %v", err)
		return c.Status(fiber.StatusInternalServerError).JSON(Response{
			Success: false,
			Message: err.Error(),
		})
	}

	return c.Status(fiber.StatusOK).JSON(Response{
		Success: true,
		Message: "Question updated successfully",
		Data:    updatedQuestion,
	})
}

// DeleteQuestion handles the request to delete a question.
// @Summary Delete question
// @Description Deletes a question (admin/operator only)
// @Tags questions
// @Accept json
// @Produce json
// @Param quiz_id path int true "Quiz ID"
// @Param question_id path int true "Question ID"
// @Success 200 {object} object{success=bool,message=string}
// @Failure 400 {object} object{success=bool,message=string}
// @Failure 500 {object} object{success=bool,message=string}
// @Router /api/admin/quizzes/{quiz_id}/questions/{question_id} [delete]
// @Security ApiKeyAuth
func (h *QuestionHandler) DeleteQuestion(c *fiber.Ctx) error {
	questionID, err := strconv.Atoi(c.Params("question_id"))
	if err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(Response{
			Success: false,
			Message: "Invalid question ID",
		})
	}

	err = h.questionService.DeleteQuestion(c.Context(), questionID)
	if err != nil {
		log.Printf("ERROR: Failed to delete question: %v", err)
		return c.Status(fiber.StatusInternalServerError).JSON(Response{
			Success: false,
			Message: "Failed to delete question",
		})
	}

	return c.Status(fiber.StatusOK).JSON(Response{
		Success: true,
		Message: "Question deleted successfully",
	})
}