package handlers

import (
	"net/http"

	"erp-mvp/core-service/internal/api/middleware"
	"erp-mvp/core-service/internal/models"
	"erp-mvp/core-service/internal/service"

	"github.com/gin-gonic/gin"
	"github.com/go-playground/validator/v10"
	"github.com/google/uuid"
)

type ItemHandler struct {
	itemService service.ItemService
	validate    *validator.Validate
}

func NewItemHandler(itemService service.ItemService) *ItemHandler {
	return &ItemHandler{
		itemService: itemService,
		validate:    validator.New(),
	}
}

// GetItems получает все товары организации
func (h *ItemHandler) GetItems(c *gin.Context) {
	claims := middleware.GetClaims(c)
	if claims == nil {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
		return
	}

	items, err := h.itemService.GetItems(c.Request.Context(), claims.OrganizationID)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get items"})
		return
	}

	c.JSON(http.StatusOK, items)
}

// CreateItem создает новый товар
func (h *ItemHandler) CreateItem(c *gin.Context) {
	claims := middleware.GetClaims(c)
	if claims == nil {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
		return
	}

	var req models.CreateItemRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid request body"})
		return
	}

	if err := h.validate.Struct(req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Validation failed", "details": err.Error()})
		return
	}

	item, err := h.itemService.CreateItem(c.Request.Context(), claims.OrganizationID, &req)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create item"})
		return
	}

	c.JSON(http.StatusCreated, item)
}

// GetItem получает товар по ID
func (h *ItemHandler) GetItem(c *gin.Context) {
	claims := middleware.GetClaims(c)
	if claims == nil {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
		return
	}

	idStr := c.Param("id")
	id, err := uuid.Parse(idStr)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid item ID"})
		return
	}

	item, err := h.itemService.GetItem(c.Request.Context(), id, claims.OrganizationID)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Item not found"})
		return
	}

	c.JSON(http.StatusOK, item)
}

// UpdateItem обновляет товар
func (h *ItemHandler) UpdateItem(c *gin.Context) {
	claims := middleware.GetClaims(c)
	if claims == nil {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
		return
	}

	idStr := c.Param("id")
	id, err := uuid.Parse(idStr)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid item ID"})
		return
	}

	var req models.CreateItemRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid request body"})
		return
	}

	if err := h.validate.Struct(req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Validation failed", "details": err.Error()})
		return
	}

	item, err := h.itemService.UpdateItem(c.Request.Context(), id, claims.OrganizationID, &req)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Item not found"})
		return
	}

	c.JSON(http.StatusOK, item)
}

// DeleteItem удаляет товар
func (h *ItemHandler) DeleteItem(c *gin.Context) {
	claims := middleware.GetClaims(c)
	if claims == nil {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
		return
	}

	idStr := c.Param("id")
	id, err := uuid.Parse(idStr)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid item ID"})
		return
	}

	if err := h.itemService.DeleteItem(c.Request.Context(), id, claims.OrganizationID); err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Item not found"})
		return
	}

	c.JSON(http.StatusNoContent, nil)
}

// SearchItems ищет товары
func (h *ItemHandler) SearchItems(c *gin.Context) {
	claims := middleware.GetClaims(c)
	if claims == nil {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
		return
	}

	query := c.Query("q")
	category := c.Query("category")

	items, err := h.itemService.SearchItems(c.Request.Context(), claims.OrganizationID, query, category)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to search items"})
		return
	}

	c.JSON(http.StatusOK, items)
}