package v1

import (
	"errors"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/gochat/gochat/internal/service"
	"github.com/gochat/gochat/pkg/response"
	"gorm.io/gorm"
)

// YearInReviewHandler serves Chatwoot API v2 year_in_review.
// Reference: app/controllers/api/v2/accounts/year_in_reviews_controller.rb.
type YearInReviewHandler struct {
	svc *service.YearInReviewService
}

func NewYearInReviewHandler(svc *service.YearInReviewService) *YearInReviewHandler {
	return &YearInReviewHandler{svc: svc}
}

// Show returns the current user's cached or freshly built yearly review payload.
// GET /api/v2/accounts/:account_id/year_in_review?year=YYYY
func (h *YearInReviewHandler) Show(c *gin.Context) {
	accountID, ok := parseAccountID(c)
	if !ok {
		return
	}
	userID := getUserID(c)
	if userID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "user not authenticated")
		return
	}

	year := service.DefaultYearInReviewYear()
	if rawYear := c.Query("year"); rawYear != "" {
		parsed, err := strconv.Atoi(rawYear)
		if err != nil {
			response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid year")
			return
		}
		year = parsed
	}

	data, err := h.svc.Show(c.Request.Context(), accountID, userID, year)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			response.AbortWithStatusError(c, http.StatusNotFound, response.ErrNotFound, "record not found")
			return
		}
		response.AbortWithStatusError(c, http.StatusInternalServerError, response.ErrInternal, "failed to build year in review")
		return
	}

	c.JSON(http.StatusOK, data)
}