package controllers

import (
	"strconv"

	"abdanhafidz.com/go-boilerplate/models/dto"
	entity "abdanhafidz.com/go-boilerplate/models/entity"
	http_error "abdanhafidz.com/go-boilerplate/models/error"
	"abdanhafidz.com/go-boilerplate/services"
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

type EventExamController interface {
	Attempt(ctx *gin.Context)
	Answer(ctx *gin.Context)
	Submit(ctx *gin.Context)
	List(ctx *gin.Context)
	Scoreboard(ctx *gin.Context)
	EventScoreboard(ctx *gin.Context)
}

type eventExamController struct {
	eventExamService services.EventExamService
}

func NewEventExamController(eventExamService services.EventExamService) EventExamController {
	return &eventExamController{
		eventExamService: eventExamService,
	}
}

// Exam Event Attempt godoc
// @Summary      Attempt Exam Event
// @Description  Start an attempt for a specific exam in an event
// @Tags         Exam Event
// @Accept       json
// @Produce      json
// @Param        event_slug  path      string  true  "Event Slug"
// @Param        exam_slug     path      string  true  "Exam Slug"
// @Success      200           {object}  dto.SuccessResponse[models.EventExamAttempt]
// @Failure      400           {object}  dto.ErrorResponse
// @Router       /api/v1/events/{event_slug}/exam/{exam_slug}/attempt [get]
func (c *eventExamController) Attempt(ctx *gin.Context) {
	eventSlug := ctx.Param("event_slug")
	examSlug := ctx.Param("exam_slug")
	accountId := ParseAccountId(ctx)
	res, err := c.eventExamService.AttemptEventExam(ctx.Request.Context(), eventSlug, examSlug, accountId)
	ResponseJSON(ctx, gin.H{"event_slug": eventSlug, "exam_slug": examSlug}, res, err)
}

// Answer Exam Event godoc
// @Summary      Answer Exam Event Question
// @Description  Submit an answer for a specific question in an exam attempt
// @Tags         Exam Event
// @Accept       json
// @Produce      json
// @Param        event_slug  path      string  true  "Event Slug"
// @Param        attempt_id    path      string  true  "Exam Attempt ID"
// @Param        request       body      dto.AnswerEventExamRequest  true  "Answer Exam Event Request"
// @Success      200           {object}  dto.SuccessResponse[dto.AnswerEventExamRequest]
// @Failure      400           {object}  dto.ErrorResponse
// @Router       /api/v1/events/{event_slug}/exam/{attempt_id}/answer_question [post]
func (c *eventExamController) Answer(ctx *gin.Context) {
	eventSlug := ctx.Param("event_slug")
	attemptId, err := uuid.Parse(ctx.Param("attempt_id"))
	if err != nil {
		ResponseJSON[any](ctx, gin.H{"attempt_id": ctx.Param("attempt_id")}, nil, http_error.INVALID_TOKEN)
		return
	}
	req := RequestJSON[dto.AnswerEventExamRequest](ctx)
	res, err := c.eventExamService.AnswerEventExam(ctx.Request.Context(), eventSlug, attemptId, req.QuestionId, req.Answer)
	ResponseJSON(ctx, gin.H{"cp_grader_result": res}, req, err)
}

// Submit Exam Event godoc
// @Summary      Submit Exam Event
// @Description  Submit the exam attempt for evaluation
// @Tags         Exam Event
// @Accept       json
// @Produce      json
// @Param        event_slug  path      string  true  "Event Slug"
// @Param        attempt_id    path      string  true  "Exam Attempt ID"
// @Success      200           {object}  dto.SuccessResponse[entity.Result]
// @Failure      400           {object}  dto.ErrorResponse
// @Router       /api/v1/events/{event_slug}/exam/{attempt_id}/submit [post]

func (c *eventExamController) Submit(ctx *gin.Context) {
	attemptId, err := uuid.Parse(ctx.Param("attempt_id"))
	if err != nil {
		ResponseJSON[any](ctx, gin.H{"attempt_id": ctx.Param("attempt_id")}, nil, http_error.INVALID_TOKEN)
		return
	}
	res, err := c.eventExamService.SubmitEventExam(ctx.Request.Context(), attemptId)
	ResponseJSON(ctx, gin.H{}, res, err)
}

// List Exam by Event godoc
// @Summary      List Exams by Event
// @Description  Retrieve a list of exams associated with a specific event
// @Tags         Exam Event
// @Accept       json
// @Produce      json
// @Param        event_slug  path      string  true  "Event Slug"
// @Success      200         {object}   dto.SuccessResponse[[]models.Exam]
// @Failure      400         {object}  dto.ErrorResponse
// @Router       /api/v1/events/{event_slug}/exam [get]
func (c *eventExamController) List(ctx *gin.Context) {
	eventSlug := ctx.Param("event_slug")
	accountId := ParseAccountId(ctx)
	res, err := c.eventExamService.ListExamByEvent(ctx.Request.Context(), eventSlug, accountId)
	ResponseJSON(ctx, gin.H{}, res, err)
}

func parseScoreboardPagination(ctx *gin.Context, defaultSort string, defaultOrder string) (int, int, entity.Pagination) {
	limit, _ := strconv.Atoi(ctx.DefaultQuery("limit", "10"))
	page, _ := strconv.Atoi(ctx.DefaultQuery("page", "1"))
	search := ctx.DefaultQuery("search", "")
	sortBy := ctx.DefaultQuery("sortBy", defaultSort)
	order := ctx.DefaultQuery("orderBy", "")
	if order == "" {
		order = ctx.DefaultQuery("order", defaultOrder)
	}

	if limit < 1 {
		limit = 10
	} else if limit > 100 {
		limit = 100
	}
	if page < 1 {
		page = 1
	}

	offset := (page - 1) * limit
	return limit, page, entity.Pagination{Limit: limit, Offset: offset, Search: search, SortBy: sortBy, Order: order}
}

func buildPaginationMeta(limit int, page int, total int64) gin.H {
	totalPages := 1
	if total > 0 {
		totalPages = int((total + int64(limit) - 1) / int64(limit))
	}

	if page > totalPages {
		page = totalPages
	}

	return gin.H{
		"totalItems":  total,
		"totalPages":  totalPages,
		"currentPage": page,
		"limit":       limit,
	}
}

// Scoreboard godoc
// @Summary      Exam Scoreboard
// @Description  Retrieve a paginated scoreboard of participants ranked by their performance in a specific exam within an event
// @Tags         Exam Event
// @Accept       json
// @Produce      json
// @Param        event_slug  path      string  true   "Event Slug"
// @Param        exam_slug   path      string  true   "Exam Slug"
// @Param        limit       query     int     false  "Number of items per page"  default(10)
// @Param        page        query     int     false  "Page number"               default(1)
// @Param        search      query     string  false  "Search keyword"
// @Param        sortBy      query     string  false  "Sort field: 'score' (default) or 'duration'"
// @Param        orderBy     query     string  false  "Sort order: 'asc' or 'desc'"
// @Param        order       query     string  false  "Sort order alias: 'asc' or 'desc'"
// @Success      200         {object}  dto.SuccessResponse[[]dto.ExamScoreboardItem]
// @Failure      400         {object}  dto.ErrorResponse
// @Security     BearerAuth
// @Router       /api/v1/events/{event_slug}/{exam_slug}/scoreboard [get]
func (c *eventExamController) Scoreboard(ctx *gin.Context) {
	eventSlug := ctx.Param("event_slug")
	examSlug := ctx.Param("exam_slug")
	accountId := ParseAccountId(ctx)
	limit, page, p := parseScoreboardPagination(ctx, "score", "desc")
	list, total, err := c.eventExamService.Scoreboard(ctx.Request.Context(), eventSlug, examSlug, accountId, p)
	meta := buildPaginationMeta(limit, page, total)
	ResponseJSON(ctx, meta, list, err)
}

// Event Scoreboard godoc
// @Summary      Event Scoreboard
// @Description  Retrieve a paginated scoreboard of participants based on total score across all exams in an event
// @Tags         Exam Event
// @Accept       json
// @Produce      json
// @Param        event_slug  path      string  true   "Event Slug"
// @Param        limit       query     int     false  "Number of items per page"  default(10)
// @Param        page        query     int     false  "Page number"               default(1)
// @Param        search      query     string  false  "Search keyword"
// @Param        sortBy      query     string  false  "Sort field: 'total_score' (default), 'username', or 'full_name'"
// @Param        orderBy     query     string  false  "Sort order: 'asc' or 'desc'"
// @Param        order       query     string  false  "Sort order alias: 'asc' or 'desc'"
// @Success      200         {object}  dto.SuccessResponse[[]dto.EventScoreboardItem]
// @Failure      400         {object}  dto.ErrorResponse
// @Security     BearerAuth
// @Router       /api/v1/events/{event_slug}/scoreboard [get]
func (c *eventExamController) EventScoreboard(ctx *gin.Context) {
	eventSlug := ctx.Param("event_slug")
	accountId := ParseAccountId(ctx)
	limit, page, p := parseScoreboardPagination(ctx, "total_score", "desc")
	list, total, err := c.eventExamService.EventScoreboard(ctx.Request.Context(), eventSlug, accountId, p)
	meta := buildPaginationMeta(limit, page, total)
	ResponseJSON(ctx, meta, list, err)
}