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"
	"gorm.io/datatypes"
)

type PaperController interface {
	List(*gin.Context)
	Find(*gin.Context)
	Start(*gin.Context)
	Finish(*gin.Context)

	QuizList(*gin.Context)
	QuizFind(*gin.Context)
	QuizAnswer(*gin.Context)
}

type paperController struct {
	service          services.PaperService
	paperQuizService services.PaperQuizService
	userService      services.UserService
	quizService      services.QuizService
	quizPaperService services.QuizPaperService
	userQuizService  services.UserQuizService
}

func NewPaperController(
	service services.PaperService,
	paperQuizService services.PaperQuizService,
	quizService services.QuizService,
	quizPaperService services.QuizPaperService,
	userService services.UserService,
	userQuizServie services.UserQuizService,
) PaperController {
	return &paperController{
		service:          service,
		paperQuizService: paperQuizService,
		userService:      userService,
		quizService:      quizService,
		quizPaperService: quizPaperService,
		userQuizService:  userQuizServie,
	}
}

// Paper List
//
// @Summary			목록 가져오기
// @Description	목록을 가져옵니다.
// @Tags        페이퍼
//
// @Accept json
// @Produce json
//
// @Security Bearer
//
// @Param q query string false "검색어"
// @Param page query int false "페이지"
// @Param limit query int false "페이지 사이즈"
//
// @Success 200 {object} models.PaperListResponse
// @Router /paper  [get]
func (controller *paperController) List(c *gin.Context) {
	q := c.DefaultQuery("q", "")
	page, err := strconv.Atoi(c.DefaultQuery("page", "1"))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	limit, err := strconv.Atoi(c.DefaultQuery("limit", "10"))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	user_id := c.GetInt64("sub")
	result, err := controller.service.List(user_id, q, page, limit)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

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

	response := models.PaperListResponse{
		Data:      *result,
		Total:     totalNumber,
		Page:      page,
		TotalPage: totalPage,
		PageSize:  limit,
	}

	c.JSON(http.StatusOK, response)
}

// Get paper
//
// @Summary 		페이퍼 정보 가져오기
// @Description	ID로 페이퍼 정보를 가져옵니다.
// @Tags        페이퍼
//
// @Accept json
// @Produce json
//
// @Security Bearer
//
// @Param paper_id path int64 true "Paper ID"
//
// @Success 200 {object} models.PaperResponse
// @Router /paper/{paper_id} [get]
func (controller *paperController) Find(c *gin.Context) {
	paper_id, err := strconv.ParseInt(c.Param("paper_id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

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

	c.JSON(http.StatusOK, result)
}

// Start Paper
//
// @Summary			퀴즈 시작
// @Description 퀴즈 시작합니다.
// @Tags        페이퍼
//
// @Accept json
// @Produce json
//
// @Security Bearer
//
// @Param paper_id path int64 true "Paper ID"
//
// @Success 200 {object} models.Paper
// @Router /paper/{paper_id}/start [patch]
func (controller *paperController) Start(c *gin.Context) {
	paper_id, err := strconv.ParseInt(c.Param("paper_id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

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

	if paper.Status != "ready" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "퀴즈를 시작할 수 없습니다."})
		return
	}

	now := time.Now()
	paper.Status = "start"
	paper.StartAt = &now

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

	c.JSON(http.StatusOK, result)
}

// Finish Paper
//
// @Summary			퀴즈 종료
// @Description 퀴즈 종료합니다.
// @Tags        페이퍼
//
// @Accept json
// @Produce json
//
// @Security Bearer
//
// @Param paper_id path int64 true "Paper ID"
//
// @Success 200 {object} models.Paper
// @Router /paper/{paper_id}/finish [patch]
func (controller *paperController) Finish(c *gin.Context) {
	paper_id, err := strconv.ParseInt(c.Param("paper_id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

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

	if paper.Status != "start" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "퀴즈를 종료할 수 없습니다."})
		return
	}

	now := time.Now()
	paper.Status = "done"
	paper.DoneAt = &now

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

	c.JSON(http.StatusOK, result)
}

// Quiz List
//
// @Summary     퀴즈페이퍼 퀴즈 목록 가져오기
// @Description 퀴즈페이퍼 퀴즈 목록을 가져옵니다.
// @Tags        페이퍼
//
// @Accept json
// @Produce json
//
// @Security Bearer
//
// @Param paper_id path int64 true "퀴즈페이퍼 ID"
// @Param page query int false "페이지"
// @Param limit query int false "페이지 사이즈"
//
// @Success 200 {object} models.PaperQuizListResponse
// @Router /paper/{paper_id}/quiz  [get]
func (controller *paperController) QuizList(c *gin.Context) {
	paper_id, err := strconv.ParseInt(c.Param("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.paperQuizService.List(paper_id, page, limit)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	totalNumber, err := controller.paperQuizService.Total(paper_id)
	if err != nil {
		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 Quiz
//
// @Summary     퀴즈페이퍼 퀴즈 가져오기
// @Description ID로 퀴즈를 가져옵니다.
// @Tags        페이퍼
//
// @Accept json
// @Produce json
//
// @Security Bearer
//
// @Param paper_id path string true "Paper ID"
// @Param quiz_id path string true "사용자퀴즈 ID"
//
// @Success 200 {object} models.PaperQuizResponse
// @Router /paper/{paper_id}/quiz/{quiz_id} [get]
func (controller *paperController) QuizFind(c *gin.Context) {
	paper_id, err := strconv.ParseInt(c.Param("paper_id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	quiz_id, err := strconv.ParseInt(c.Param("quiz_id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

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

	if paper_id != result.UserQuizPaperID {
		c.JSON(http.StatusBadRequest, gin.H{"error": "퀴즈시트와 퀴즈가 일치하지 않습니다."})
		return
	}

	c.JSON(http.StatusOK, result)
}

// Answer Quiz
//
// @Summary 퀴즈 답변
// @Description 퀴즈 답변을 제출합니다..
// @Tags    페이퍼
//
// @Accept json
// @Produce json
//
// @Security Bearer
//
// @Param paper_id path int64 true "Paper ID"
// @Param quiz_id path int64 true "Quiz ID"
// @Param quizBody body models.AnswerQuizRequest true "Answer Body"
//
// @Router /paper/{paper_id}/quiz/{quiz_id}/answer [patch]
func (controller *paperController) QuizAnswer(c *gin.Context) {
	paper_id, err := strconv.ParseInt(c.Param("paper_id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	id, err := strconv.ParseInt(c.Param("quiz_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.userQuizService.Find(id)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	if paper_id != userquiz.UserQuizPaperID {
		c.JSON(http.StatusBadRequest, gin.H{"error": "퀴즈시트와 퀴즈가 일치하지 않습니다."})
		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.userQuizService.Update(userquiz)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

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

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