package routes

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

	"git.artlef.fr/bibliomane/internal/appcontext"
	"git.artlef.fr/bibliomane/internal/i18nresource"
	"git.artlef.fr/bibliomane/internal/model"
	"git.artlef.fr/bibliomane/internal/myvalidator"
	"git.artlef.fr/bibliomane/internal/query"
	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

func DeleteCollectionBookHandler(ac appcontext.AppContext) {
	collectionItemId, err := strconv.ParseUint(ac.C.Param("id"), 10, 64)
	if err != nil {
		ac.C.JSON(http.StatusBadRequest, gin.H{"error": err})
		return
	}

	user, err := ac.GetAuthenticatedUser()
	if err != nil {
		myvalidator.ReturnErrorsAsJsonResponse(&ac, err)
		return
	}

	var collectionItem model.CollectionItem
	err = ac.Db.First(&collectionItem, collectionItemId).Error
	if err != nil {
		myvalidator.ReturnErrorsAsJsonResponse(&ac, err)
		return
	}
	collection, err := query.FetchCollectionHeaderFromItem(ac.Db, collectionItem.ID)

	if collection.UserID != user.ID {
		err := myvalidator.HttpError{
			StatusCode: http.StatusUnauthorized,
			Err:        errors.New(i18nresource.GetTranslatedMessage(&ac, "Unauthorized")),
		}
		myvalidator.ReturnErrorsAsJsonResponse(&ac, err)
		return
	}

	err = ac.Db.Delete(&collectionItem).Error
	if err != nil {
		myvalidator.ReturnErrorsAsJsonResponse(&ac, err)
		return
	}

	//update position on remaining items
	q := ac.Db.Model(&model.CollectionItem{})
	q = q.Where("collection_id = ? AND position > ?", collectionItem.CollectionID, collectionItem.Position)
	err = q.UpdateColumn("position", gorm.Expr("position - 1")).Error
	if err != nil {
		myvalidator.ReturnErrorsAsJsonResponse(&ac, err)
		return
	}
	ac.C.JSON(http.StatusOK, "Success")
}