package controllers

import (
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
	"errors"

	"autostore/internal/application/commands"
	"autostore/internal/application/dto"
	"autostore/internal/application/interfaces"
	"autostore/internal/application/queries"
)

type ItemsController struct {
	addItemCmd     *commands.AddItemCommand
	getItemQry     *queries.GetItemQuery
	listItemsQry   *queries.ListItemsQuery
	deleteItemCmd  *commands.DeleteItemCommand
	logger         interfaces.ILogger
}

func NewItemsController(
	addItemCmd *commands.AddItemCommand,
	getItemQry *queries.GetItemQuery,
	listItemsQry *queries.ListItemsQuery,
	deleteItemCmd *commands.DeleteItemCommand,
	logger interfaces.ILogger,
) *ItemsController {
	return &ItemsController{
		addItemCmd:    addItemCmd,
		getItemQry:    getItemQry,
		listItemsQry:  listItemsQry,
		deleteItemCmd: deleteItemCmd,
		logger:        logger,
	}
}

func (ctrl *ItemsController) CreateItem(c *gin.Context) {
	userID, exists := c.Get("userID")
	if !exists {
		c.JSON(http.StatusUnauthorized, dto.JSendError("Unauthorized", http.StatusUnauthorized))
		return
	}

	var createItemDTO dto.CreateItemDTO
	if err := c.ShouldBindJSON(&createItemDTO); err != nil {
		c.JSON(http.StatusBadRequest, dto.JSendError("Invalid request body", http.StatusBadRequest))
		return
	}

	if err := createItemDTO.Validate(); err != nil {
		c.JSON(http.StatusBadRequest, dto.JSendError(err.Error(), http.StatusBadRequest))
		return
	}

	itemID, err := ctrl.addItemCmd.Execute(c.Request.Context(), createItemDTO.Name, createItemDTO.ExpirationDate.Time, createItemDTO.OrderURL, userID.(string))
	if err != nil {
		c.JSON(http.StatusInternalServerError, dto.JSendError(err.Error(), http.StatusInternalServerError))
		return
	}

	response := &dto.ItemResponseDTO{
		ID:             itemID,
		Name:           createItemDTO.Name,
		ExpirationDate: createItemDTO.ExpirationDate,
		OrderURL:       createItemDTO.OrderURL,
		UserID:         userID.(string),
		CreatedAt:      dto.JSONTime{Time: time.Now()},
	}

	c.JSON(http.StatusCreated, dto.JSendSuccess(response))
}

func (ctrl *ItemsController) GetItem(c *gin.Context) {
	userID, exists := c.Get("userID")
	if !exists {
		c.JSON(http.StatusUnauthorized, dto.JSendError("Unauthorized", http.StatusUnauthorized))
		return
	}

	itemID := c.Param("id")
	if itemID == "" {
		c.JSON(http.StatusBadRequest, dto.JSendError("Item ID is required", http.StatusBadRequest))
		return
	}

	item, err := ctrl.getItemQry.Execute(c.Request.Context(), itemID, userID.(string))
	if err != nil {
		if errors.Is(err, queries.ErrItemNotFound) {
			c.JSON(http.StatusNotFound, dto.JSendError("Item not found", http.StatusNotFound))
			return
		}
		if errors.Is(err, queries.ErrUnauthorizedAccess) {
			c.JSON(http.StatusNotFound, dto.JSendError("Item not found", http.StatusNotFound))
			return
		}
		c.JSON(http.StatusInternalServerError, dto.JSendError(err.Error(), http.StatusInternalServerError))
		return
	}

	response := (&dto.ItemResponseDTO{}).FromEntity(item)

	c.JSON(http.StatusOK, dto.JSendSuccess(response))
}

func (ctrl *ItemsController) ListItems(c *gin.Context) {
	userID, exists := c.Get("userID")
	if !exists {
		c.JSON(http.StatusUnauthorized, dto.JSendError("Unauthorized", http.StatusUnauthorized))
		return
	}

	items, err := ctrl.listItemsQry.Execute(c.Request.Context(), userID.(string))
	if err != nil {
		c.JSON(http.StatusInternalServerError, dto.JSendError(err.Error(), http.StatusInternalServerError))
		return
	}

	var response []*dto.ItemResponseDTO
	for _, item := range items {
		response = append(response, (&dto.ItemResponseDTO{}).FromEntity(item))
	}

	c.JSON(http.StatusOK, dto.JSendSuccess(response))
}

func (ctrl *ItemsController) DeleteItem(c *gin.Context) {
	userID, exists := c.Get("userID")
	if !exists {
		c.JSON(http.StatusUnauthorized, dto.JSendError("Unauthorized", http.StatusUnauthorized))
		return
	}

	itemID := c.Param("id")
	if itemID == "" {
		c.JSON(http.StatusBadRequest, dto.JSendError("Item ID is required", http.StatusBadRequest))
		return
	}

	err := ctrl.deleteItemCmd.Execute(c.Request.Context(), itemID, userID.(string))
	if err != nil {
		if errors.Is(err, commands.ErrItemNotFound) {
			c.JSON(http.StatusNotFound, dto.JSendError("Item not found", http.StatusNotFound))
			return
		}
		if errors.Is(err, commands.ErrUnauthorizedAccess) {
			c.JSON(http.StatusNotFound, dto.JSendError("Item not found", http.StatusNotFound))
			return
		}
		c.JSON(http.StatusInternalServerError, dto.JSendError(err.Error(), http.StatusInternalServerError))
		return
	}

	c.JSON(http.StatusNoContent, dto.JSendSuccess(nil))
}