/*
 * Copyright (C) 2023 Simon Bruder
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package catering.inventory;

import static org.salespointframework.core.Currencies.EURO;

import java.util.Optional;

import javax.money.MonetaryAmount;
import javax.money.NumberValue;

import org.javamoney.moneta.Money;
import org.salespointframework.catalog.Product;
import org.salespointframework.inventory.UniqueInventory;
import org.salespointframework.inventory.UniqueInventoryItem;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.Assert;
import org.springframework.validation.Errors;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;

import catering.catalog.CatalogDummy;
import catering.catalog.CateringCatalog;
import jakarta.validation.Valid;

@Controller
class InventoryController {
	private final UniqueInventory<UniqueInventoryItem> inventory;
	private final CateringCatalog cateringCatalog;

	InventoryController(UniqueInventory<UniqueInventoryItem> inventory, CateringCatalog cateringCatalog) {
		Assert.notNull(inventory, "Inventory must not be null!");
		Assert.notNull(inventory, "CateringCatalog must not be null!");
		this.inventory = inventory;
		this.cateringCatalog = cateringCatalog;
	}

	@PreAuthorize("hasRole('ADMIN')")
	@GetMapping("/inventory")
	String list(Model model) {
		model.addAttribute("inventory", inventory.findAll());

		return "inventory";
	}

	@PreAuthorize("hasRole('ADMIN')")
	@GetMapping("/inventory/edit/{pid}")
	String edit(Model model, @PathVariable Product pid) {
		CatalogDummy product = (CatalogDummy) pid;
		UniqueInventoryItem item = inventory.findByProduct(pid).get();
		return edit(model, pid,
				new InventoryMutateForm(product.getType(),
						product.getName(),
						item.getQuantity(),
						product.getWholesalePrice().getNumber().doubleValueExact(),
						product.getPrice().getNumber().doubleValueExact(),
						Optional.ofNullable(product.getPromotionPrice())
								.map(MonetaryAmount::getNumber)
								.map(NumberValue::doubleValueExact)));
	}

	String edit(Model model, @PathVariable Product pid, InventoryMutateForm form) {
		model.addAttribute("actionIsAdd", false);
		model.addAttribute("form", form);

		return "inventory-mutate";
	}

	@PreAuthorize("hasRole('ADMIN')")
	@PostMapping("/inventory/edit/{pid}")
	String edit(@Valid @ModelAttribute("form") InventoryMutateForm form, Errors result, @PathVariable Product pid, Model model) {
		if (result.hasErrors()) {
			return edit(model, pid, form);
		}
		CatalogDummy product = (CatalogDummy) pid;
		UniqueInventoryItem item = inventory.findByProduct(pid).get();

		product.setName(form.getName());
		product.setType(form.getType());
		product.setPrice(Money.of(form.getRetailPrice(), EURO));
		product.setWholesalePrice(Money.of(form.getWholesalePrice(), EURO));
		product.setPromotionPrice(form.getPromotionPrice().map(price -> Money.of(price, EURO)).orElse(null));

		product = cateringCatalog.save(product);

		// no setQuantity in enterprise java
		// (though returing a modified object is actually nice)
		inventory.save(item.increaseQuantity(form.getQuantity().subtract(item.getQuantity())));
		return "redirect:/inventory";
	}

	@PreAuthorize("hasRole('ADMIN')")
	@GetMapping("/inventory/add")
	String add(Model model) {
		return add(model, InventoryMutateForm.empty());
	}

	String add(Model model, InventoryMutateForm form) {
		model.addAttribute("actionIsAdd", true);
		model.addAttribute("form", form);
		return "inventory-mutate";
	}

	@PreAuthorize("hasRole('ADMIN')")
	@PostMapping("/inventory/add")
	String add(@Valid @ModelAttribute("form") InventoryMutateForm form, Errors result, Model model) {
		if (result.hasErrors()) {
			return add(model, form);
		}
		inventory.save(new UniqueInventoryItem(
				cateringCatalog
						.save(new CatalogDummy(form.getName(), form.getType(), Money.of(form.getRetailPrice(), EURO),
								Money.of(form.getWholesalePrice(), EURO),
								form.getPromotionPrice().map(price -> Money.of(price, EURO)).orElse(null))),
				form.getQuantity()));
		return "redirect:/inventory";
	}

	@PreAuthorize("hasRole('ADMIN')")
	@GetMapping("/inventory/delete/{pid}")
	String delete(@PathVariable Product pid) {
		UniqueInventoryItem item = inventory.findByProduct(pid).get();
		inventory.delete(item);
		cateringCatalog.delete((CatalogDummy) pid);
		return "redirect:/inventory";
	}
}