package handler

import (
	"BE-MiniERP/database"
	"BE-MiniERP/modules/inventory/models"
	"BE-MiniERP/modules/inventory/repository"
	"BE-MiniERP/modules/inventory/service"
	"strconv"
	"strings"

	"github.com/gofiber/fiber/v2"
)

type ProductHandler struct {
	Repo *repository.ProductRepository
}

func NewProductHandler() *ProductHandler {
	return &ProductHandler{
		Repo: repository.NewProductRepository(database.DB),
	}
}

func (h *ProductHandler) GetAll(c *fiber.Ctx) error {
	page := c.QueryInt("page", 1)
	limit := c.QueryInt("limit", 10) // default 10
	offset := (page - 1) * limit
	search := c.Query("search", "")
	categoryID := c.QueryInt("category_id", 0)
	collectionID := c.QueryInt("collection_id", 0)
	colourID := c.QueryInt("colour_id", 0)
	sizeID := c.QueryInt("size_id", 0)

	products, err := h.Repo.FindAll(page, limit, offset, search, uint(categoryID), uint(collectionID), uint(colourID), uint(sizeID))
	if err != nil {
		return c.Status(500).JSON(fiber.Map{"error": "Failed to fetch products"})
	}
	return c.JSON(products)
}

func (h *ProductHandler) Create(c *fiber.Ctx) error {
	var input models.Product

	if err := c.BodyParser(&input); err != nil {
		return c.Status(400).JSON(fiber.Map{"error": "Invalid input format"})
	}

	if input.Name == "" {
		return c.Status(400).JSON(fiber.Map{"error": "Product name is required"})
	}
	if input.Price <= 0 {
		return c.Status(400).JSON(fiber.Map{"error": "Price must be greater than 0"})
	}
	if input.Hpp <= 0 {
		return c.Status(400).JSON(fiber.Map{"error": "HPP must be greater than 0"})
	}
	if input.CategoryID == 0 {
		return c.Status(400).JSON(fiber.Map{"error": "Category ID is required"})
	}
	if input.CollectionID == 0 {
		return c.Status(400).JSON(fiber.Map{"error": "Collection ID is required"})
	}
	if input.ColourID == 0 {
		return c.Status(400).JSON(fiber.Map{"error": "Colour ID is required"})
	}
	if input.SizeID == 0 {
		return c.Status(400).JSON(fiber.Map{"error": "Size ID is required"})
	}
	if input.UnitOfMeasure == "" {
		return c.Status(400).JSON(fiber.Map{"error": "Unit of measure is required"})
	}

	if err := h.Repo.PreloadRelations(&input); err != nil {
		return c.Status(400).JSON(fiber.Map{
			"error": "Failed to preload relations: " + err.Error(),
		})
	}

	sku, err := service.GenerateSKU(&input)
	if err != nil {
		return c.Status(400).JSON(fiber.Map{
			"error": "Failed to generate SKU: " + err.Error(),
		})
	}
	input.SKU = sku

	if err := h.Repo.Create(&input); err != nil {
		if strings.Contains(err.Error(), "duplicate key value") && strings.Contains(err.Error(), "sku") {
			return c.Status(400).JSON(fiber.Map{"error": "SKU already exists"})
		}

		return c.Status(500).JSON(fiber.Map{
			"error": "Failed to create product: " + err.Error(),
		})
	}

	return c.Status(201).JSON(input)
}

func (h *ProductHandler) Update(c *fiber.Ctx) error {
	id, _ := strconv.Atoi(c.Params("id"))
	var input models.Product
	if err := c.BodyParser(&input); err != nil {
		return c.Status(400).JSON(fiber.Map{"error": "Invalid input"})
	}
	if err := h.Repo.Update(uint(id), &input); err != nil {
		return c.Status(500).JSON(fiber.Map{"error": "Failed to update product"})
	}
	return c.JSON(fiber.Map{"message": "Product updated"})
}

func (h *ProductHandler) Delete(c *fiber.Ctx) error {
	id, _ := strconv.Atoi(c.Params("id"))
	if err := h.Repo.Delete(uint(id)); err != nil {
		return c.Status(500).JSON(fiber.Map{"error": "Failed to delete product"})
	}
	return c.JSON(fiber.Map{"message": "Product deleted"})
}