package handler

import (
	"strconv"

	"apskel-pos-be/internal/appcontext"
	"apskel-pos-be/internal/constants"
	"apskel-pos-be/internal/contract"
	"apskel-pos-be/internal/logger"
	"apskel-pos-be/internal/service"
	"apskel-pos-be/internal/util"
	"apskel-pos-be/internal/validator"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

type ProductHandler struct {
	productService   service.ProductService
	productValidator validator.ProductValidator
}

func NewProductHandler(
	productService service.ProductService,
	productValidator validator.ProductValidator,
) *ProductHandler {
	return &ProductHandler{
		productService:   productService,
		productValidator: productValidator,
	}
}

func (h *ProductHandler) CreateProduct(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	var req contract.CreateProductRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		logger.FromContext(c.Request.Context()).WithError(err).Error("ProductHandler::CreateProduct -> request binding failed")
		validationResponseError := contract.NewResponseError(constants.MissingFieldErrorCode, constants.RequestEntity, err.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "ProductHandler::CreateProduct")
		return
	}

	validationError, validationErrorCode := h.productValidator.ValidateCreateProductRequest(&req)
	if validationError != nil {
		validationResponseError := contract.NewResponseError(validationErrorCode, constants.RequestEntity, validationError.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "ProductHandler::CreateProduct")
		return
	}

	productResponse := h.productService.CreateProduct(ctx, contextInfo, &req)
	if productResponse.HasErrors() {
		errorResp := productResponse.GetErrors()[0]
		logger.FromContext(ctx).WithError(errorResp).Error("ProductHandler::CreateProduct -> Failed to create product from service")
	}

	util.HandleResponse(c.Writer, c.Request, productResponse, "ProductHandler::CreateProduct")
}

func (h *ProductHandler) UpdateProduct(c *gin.Context) {
	ctx := c.Request.Context()

	productIDStr := c.Param("id")
	productID, err := uuid.Parse(productIDStr)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("ProductHandler::UpdateProduct -> Invalid product ID")
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid product ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "ProductHandler::UpdateProduct")
		return
	}

	var req contract.UpdateProductRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		logger.FromContext(ctx).WithError(err).Error("ProductHandler::UpdateProduct -> request binding failed")
		validationResponseError := contract.NewResponseError(constants.MissingFieldErrorCode, constants.RequestEntity, "Invalid request body")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "ProductHandler::UpdateProduct")
		return
	}

	validationError, validationErrorCode := h.productValidator.ValidateUpdateProductRequest(&req)
	if validationError != nil {
		validationResponseError := contract.NewResponseError(validationErrorCode, constants.RequestEntity, validationError.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "ProductHandler::UpdateProduct")
		return
	}

	productResponse := h.productService.UpdateProduct(ctx, productID, &req)
	if productResponse.HasErrors() {
		errorResp := productResponse.GetErrors()[0]
		logger.FromContext(ctx).WithError(errorResp).Error("ProductHandler::UpdateProduct -> Failed to update product from service")
	}

	util.HandleResponse(c.Writer, c.Request, productResponse, "ProductHandler::UpdateProduct")
}

func (h *ProductHandler) DeleteProduct(c *gin.Context) {
	ctx := c.Request.Context()

	productIDStr := c.Param("id")
	productID, err := uuid.Parse(productIDStr)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("ProductHandler::DeleteProduct -> Invalid product ID")
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid product ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "ProductHandler::DeleteProduct")
		return
	}

	productResponse := h.productService.DeleteProduct(ctx, productID)
	if productResponse.HasErrors() {
		errorResp := productResponse.GetErrors()[0]
		logger.FromContext(ctx).WithError(errorResp).Error("ProductHandler::DeleteProduct -> Failed to delete product from service")
	}

	util.HandleResponse(c.Writer, c.Request, productResponse, "ProductHandler::DeleteProduct")
}

func (h *ProductHandler) GetProduct(c *gin.Context) {
	ctx := c.Request.Context()

	productIDStr := c.Param("id")
	productID, err := uuid.Parse(productIDStr)
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("ProductHandler::GetProduct -> Invalid product ID")
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid product ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "ProductHandler::GetProduct")
		return
	}

	productResponse := h.productService.GetProductByID(ctx, productID)
	if productResponse.HasErrors() {
		errorResp := productResponse.GetErrors()[0]
		logger.FromContext(ctx).WithError(errorResp).Error("ProductHandler::GetProduct -> Failed to get product from service")
	}

	util.HandleResponse(c.Writer, c.Request, productResponse, "ProductHandler::GetProduct")
}

func (h *ProductHandler) ListProducts(c *gin.Context) {
	ctx := c.Request.Context()

	req := &contract.ListProductsRequest{
		Page:  1,
		Limit: 10,
	}

	// Parse query parameters
	if pageStr := c.Query("page"); pageStr != "" {
		if page, err := strconv.Atoi(pageStr); err == nil {
			req.Page = page
		}
	}

	if limitStr := c.Query("limit"); limitStr != "" {
		if limit, err := strconv.Atoi(limitStr); err == nil {
			req.Limit = limit
		}
	}

	if search := c.Query("search"); search != "" {
		req.Search = search
	}

	if businessType := c.Query("business_type"); businessType != "" {
		req.BusinessType = businessType
	}

	if organizationIDStr := c.Query("organization_id"); organizationIDStr != "" {
		if organizationID, err := uuid.Parse(organizationIDStr); err == nil {
			req.OrganizationID = &organizationID
		}
	}

	if categoryIDStr := c.Query("category_id"); categoryIDStr != "" {
		if categoryID, err := uuid.Parse(categoryIDStr); err == nil {
			req.CategoryID = &categoryID
		}
	}

	if isActiveStr := c.Query("is_active"); isActiveStr != "" {
		if isActive, err := strconv.ParseBool(isActiveStr); err == nil {
			req.IsActive = &isActive
		}
	}

	if minPriceStr := c.Query("min_price"); minPriceStr != "" {
		if minPrice, err := strconv.ParseFloat(minPriceStr, 64); err == nil {
			req.MinPrice = &minPrice
		}
	}

	if maxPriceStr := c.Query("max_price"); maxPriceStr != "" {
		if maxPrice, err := strconv.ParseFloat(maxPriceStr, 64); err == nil {
			req.MaxPrice = &maxPrice
		}
	}

	validationError, validationErrorCode := h.productValidator.ValidateListProductsRequest(req)
	if validationError != nil {
		logger.FromContext(ctx).WithError(validationError).Error("ProductHandler::ListProducts -> request validation failed")
		validationResponseError := contract.NewResponseError(validationErrorCode, constants.RequestEntity, validationError.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "ProductHandler::ListProducts")
		return
	}

	productsResponse := h.productService.ListProducts(ctx, req)
	if productsResponse.HasErrors() {
		errorResp := productsResponse.GetErrors()[0]
		logger.FromContext(ctx).WithError(errorResp).Error("ProductHandler::ListProducts -> Failed to list products from service")
	}

	util.HandleResponse(c.Writer, c.Request, productsResponse, "ProductHandler::ListProducts")
}