package controllers

import (
	"encoding/json"
	"fmt"
	"net/http"
	"strconv"
	"time"

	"learnsteam/cslms-api/internal/models"
	"learnsteam/cslms-api/internal/services"

	"github.com/gin-gonic/gin"
	"github.com/google/go-cmp/cmp"
	"github.com/google/uuid"
	"gorm.io/datatypes"
)

type UserQuizController interface {
	List(*gin.Context)
	Find(*gin.Context)
	Create(*gin.Context)
	Update(*gin.Context)
	Answer(*gin.Context)
}

type userQuizController struct {
	service              services.UserQuizService
	quizService          services.QuizService
	userquizpaperService services.UserQuizPaperService
}

func NewUserQuizController(service services.UserQuizService, quizService services.QuizService, userquizpaperService services.UserQuizPaperService) UserQuizController {
	return &userQuizController{
		service:              service,
		quizService:          quizService,
		userquizpaperService: userquizpaperService,
	}
}

// UserQuiz List
//
// @Summary     사용자퀴즈 목록 가져오기
// @Description 사용자퀴즈 목록을 가져옵니다.
// @Tags        사용자퀴즈
//
// @Accept json
// @Produce json
//
// @Security Bearer
//
// @Param user_quiz_paper_id query string true "사용자퀴즈페이퍼 ID"
// @Param q query string false "검색어"
// @Param page query int false "페이지"
// @Param limit query int false "페이지 사이즈"
//
// @Success 200 {object} models.UserQuizListResponse
// @Router /userquiz  [get]
func (controller *userQuizController) List(c *gin.Context) {
	quiz_paper_id, err := strconv.ParseInt(c.DefaultQuery("user_quiz_paper_id", ""), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	page, err := strconv.Atoi(c.DefaultQuery("page", "1"))
	if err != nil {
		fmt.Println("error : page")
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	limit, err := strconv.Atoi(c.DefaultQuery("limit", "10"))
	if err != nil {
		fmt.Println("error : limit")
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	result, err := controller.service.List(quiz_paper_id, page, limit)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	totalNumber, err := controller.service.Total(quiz_paper_id)
	if err != nil {
		fmt.Println("error : list")
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	totalPage := int64(totalNumber/int64(limit) + 1)

	c.JSON(http.StatusOK, gin.H{"data": result, "total": totalNumber, "page": page, "totalPage": totalPage, "pageSize": limit})
}

// Get UserQuiz
//
// @Summary     사용자퀴즈 가져오기
// @Description ID로 사용자퀴즈를 가져옵니다.
// @Tags        사용자퀴즈
//
// @Accept json
// @Produce json
//
// @Security Bearer
//
// @Param id path string true "사용자퀴즈 ID"
//
// @Success 200 {object} models.UserQuizResponse
// @Router /userquiz/{id} [get]
func (controller *userQuizController) Find(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	result, err := controller.service.Find(id)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, result)
}

// Create Quiz
//
// @Summary     사용자퀴즈 생성
// @Description 사용자퀴즈를 만듭니다.
// @Tags        사용자퀴즈
//
// @Accept json
// @Produce json
//
// @Security Bearer
//
// @Param quizBody body models.UserQuizRequest true "UserQuiz Body"
//
// @Success 200 {object} models.UserQuizResponse
// @Router /userquiz [post]
func (controller *userQuizController) Create(c *gin.Context) {
	var request models.UserQuizRequest
	if err := c.ShouldBindJSON(&request); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	var content datatypes.JSON
	content, err := json.Marshal(request.Content)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	var answer datatypes.JSON
	answer, err = json.Marshal([]string{})
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	userquiz := &models.UserQuiz{
		GUID:            uuid.NewString(),
		CenterID:        request.CenterID,
		UserQuizPaperID: request.UserQuizPaperID,
		No:              request.No,
		QuizID:          request.QuizID,
		QuestionType:    request.QuestionType,
		Question:        request.Question,
		Content:         content,
		Answer:          answer,
		UpdatedAt:       time.Now(),
		CreatedAt:       time.Now(),
	}

	result, err := controller.service.Create(userquiz)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, result)
}

// Update Quiz
//
// @Summary 사용자퀴즈 수정
// @Description 사용자퀴즈를 수정합니다.
// @Tags    사용자퀴즈
//
// @Accept json
// @Produce json
//
// @Security Bearer
//
// @Param id path int64 true "Quiz ID"
// @Param quizBody body models.UserQuizRequest true "Quiz Body"
//
// @Success 200 {object} models.UserQuizResponse
// @Router /userquiz/{id} [put]
func (controller *userQuizController) Update(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	var request models.UserQuizRequest
	if err := c.ShouldBindJSON(&request); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	userquiz, err := controller.service.Find(id)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	var content datatypes.JSON
	content, err = json.Marshal(request.Content)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	var answer datatypes.JSON
	answer, err = json.Marshal([]string{})
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	userquiz.CenterID = request.CenterID
	userquiz.UserQuizPaperID = request.UserQuizPaperID
	userquiz.No = request.No
	userquiz.QuestionType = request.QuestionType
	userquiz.Question = request.Question
	userquiz.Content = content
	userquiz.Answer = answer
	userquiz.Status = request.Status
	userquiz.Score = request.Score

	result, err := controller.service.Update(userquiz)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, result)
}

// Answer Quiz
//
// @Summary 사용자퀴즈 답변
// @Description 사용자퀴즈 답변을 제출합니다..
// @Tags    사용자퀴즈
//
// @Accept json
// @Produce json
//
// @Security Bearer
//
// @Param id path int64 true "Quiz ID"
// @Param quizBody body models.AnswerQuizRequest true "Answer Body"
//
// @Router /userquiz/{id} [patch]
func (controller *userQuizController) Answer(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	var request models.AnswerQuizRequest
	if err := c.ShouldBindJSON(&request); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	userquiz, err := controller.service.Find(id)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	user_id := c.GetInt64("sub")
	if user_id != userquiz.UserID {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Wrong user"})
		return
	}

	if userquiz.Status != "ready" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Answered"})
		return
	}

	quiz, err := controller.quizService.Find(userquiz.QuizID)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	var userAnswer datatypes.JSON
	userAnswer, err = json.Marshal(request.Answer)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	isCorrect := cmp.Equal(quiz.Answer.String(), userAnswer.String())
	var score float32 = 0.0
	var correction string = "fail"
	if isCorrect {
		score = 1.0
		correction = "success"
	}

	userquiz.Answer = userAnswer
	userquiz.Status = "done"
	userquiz.Result = correction
	userquiz.Score = score

	_, err = controller.service.Update(userquiz)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	_, err = controller.userquizpaperService.UpdateScore(userquiz.UserQuizPaperID)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// fmt.Println("userscore : ", result.UserScore)

	c.JSON(http.StatusOK, gin.H{"message": "success"})
}