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 LocationHandler struct {
	locationService service.LocationService
	validate        *validator.Validate
}

func NewLocationHandler(locationService service.LocationService) *LocationHandler {
	return &LocationHandler{
		locationService: locationService,
		validate:        validator.New(),
	}
}

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

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

	c.JSON(http.StatusOK, locations)
}

// CreateLocation создает новое место хранения
func (h *LocationHandler) CreateLocation(c *gin.Context) {
	claims := middleware.GetClaims(c)
	if claims == nil {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
		return
	}

	var req models.CreateLocationRequest
	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
	}

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

	c.JSON(http.StatusCreated, location)
}

// GetLocation получает место хранения по ID
func (h *LocationHandler) GetLocation(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 location ID"})
		return
	}

	location, err := h.locationService.GetLocation(c.Request.Context(), id, claims.OrganizationID)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Location not found"})
		return
	}

	c.JSON(http.StatusOK, location)
}

// UpdateLocation обновляет место хранения
func (h *LocationHandler) UpdateLocation(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 location ID"})
		return
	}

	var req models.CreateLocationRequest
	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
	}

	location, err := h.locationService.UpdateLocation(c.Request.Context(), id, claims.OrganizationID, &req)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Location not found"})
		return
	}

	c.JSON(http.StatusOK, location)
}

// DeleteLocation удаляет место хранения
func (h *LocationHandler) DeleteLocation(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 location ID"})
		return
	}

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

	c.JSON(http.StatusNoContent, nil)
}

// GetChildren получает дочерние места хранения
func (h *LocationHandler) GetChildren(c *gin.Context) {
	claims := middleware.GetClaims(c)
	if claims == nil {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Unauthorized"})
		return
	}

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

	children, err := h.locationService.GetChildren(c.Request.Context(), parentID, claims.OrganizationID)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Parent location not found"})
		return
	}

	c.JSON(http.StatusOK, children)
}