package ui

import (
	"context"
	"fmt"

	entity "git.pbiernat.io/egommerce/api-entities/http"
	"git.pbiernat.io/egommerce/api-entities/model"

	"git.pbiernat.io/egommerce/basket-service/internal/service"
)

func AddProductToBasket(srv *service.BasketService, productID, qty int, basketID, reqID string) (*model.BasketModel, error) {
	// FIXME: error occurs when 0 is passed
	ctx := context.Background()
	basket, err := srv.FetchFromDB(ctx, basketID)
	if err != nil {
		srv.Log("Basket#:%s not found. Creating new one...", basketID)
		basket, err = srv.CreateBasket(ctx, basketID)
		if err != nil {
			ctx.Done() // FIXME
			srv.Log("Creating basket error: %v", err)
			return nil, err
		}
	}

	item, err := srv.FetchItem(ctx, basket.ID, productID)
	if err != nil {
		err := srv.AddItem(ctx, productID, basket.ID, qty)
		ctx.Done() // FIXME
		if err != nil {
			srv.Log("Error adding product to basket: %v", err)
			return nil, err
		}
		return basket, nil
	}

	err = srv.UpdateItem(ctx, item, item.Quantity+qty)
	if err != nil {
		srv.Log("UpdateItem error: %v", err)
	}
	ctx.Done() // FIXME

	return basket, nil
}

func RemoveProductFromBasket(srv *service.BasketService, productID, qty int, basketID, reqID string) (*model.BasketModel, error) {
	ctx := context.Background()
	basket, err := srv.FetchFromDB(ctx, basketID)
	if err != nil {
		ctx.Done() // FIXME
		return nil, err
	}

	item, err := srv.FetchItem(ctx, basket.ID, productID)
	if err != nil {
		fmt.Printf("FetchItem not found item in db: %v\n", err)
		ctx.Done() // FIXME
		return basket, err
	}

	if item.Quantity <= qty {
		err = srv.RemoveItem(ctx, item.ProductID, item.BasketID)
		if err != nil {
			ctx.Done() // FIXME
			return basket, err
		}
	} else {
		qty = item.Quantity - qty
		err = srv.UpdateItem(ctx, item, qty)
		if err != nil {
			srv.Log("UpdateItem error: %v", err)
		}
	}
	ctx.Done() // FIXME

	return basket, nil
}

func CheckoutBasket(srv *service.BasketService, basketID, reqID string) (*entity.BasketCheckoutResponse, error) {
	res := &entity.BasketCheckoutResponse{}
	basketID, err := srv.CheckoutBasket(reqID, basketID)
	if err != nil {
		return res, err
	}

	res.ID = basketID

	return res, nil
}