const foodSearch = document.querySelector("#food-search");
const searchEntries = document.querySelector("#search-entries");
const foodMenu = document.querySelector("#food-menu");
const summary = document.querySelector("#summary");
const summaryKcal = document.querySelector("#summary .summary-kcal");

updateSummary();
initFoodList();
foodSearch.addEventListener("input", onFoodSearched);
if (foodSearch.value != "") onFoodSearched();

function initFoodList() {
	const dataList = document.querySelector("#food-list");

	for (let food of foods) {
		const option = document.createElement("option");
		option.setAttribute("value", food.name);
		dataList.appendChild(option);
	}
}

function onFoodSearched() {
	const food = foodSearch.value;
	const foodLC = food.toLowerCase();
	
	if (food == "") {
		createSearchEntries([]);
		return;
	}

	const foodsCopy = structuredClone(foods);

	foodsCopy.sort((a, b) => {
		const aNameLC = a.name.toLowerCase();
		const bNameLC = b.name.toLowerCase();

		const ainc = aNameLC.includes(foodLC);
		const binc = bNameLC.includes(foodLC);
		if (ainc && binc) {
			return 0;
		} else if (ainc) {
			return -1;
		} else if (binc) {
			return 1;
		}

		const distA = levenshtein(foodLC, aNameLC);
		const distB = levenshtein(foodLC, bNameLC);
		return distA - distB;
	})

	const maxDist = 10;
	let maxAmount = 10;
	let amount = 0;
	for (let f of foodsCopy) {
		const fnameLC = f.name.toLowerCase();
		if (fnameLC.includes(foodLC)) {
			amount++;
			maxAmount++;
			continue;
		}
		const dist = levenshtein(foodLC, fnameLC);
		if (dist >= maxDist) break;
		amount++;
	}

	createSearchEntries(foodsCopy.slice(0, Math.min(amount, maxAmount, 30)));
}

async function createSearchEntries(foods) {
	const nodes = [];
	for (let food of foods) {
		const node = await JST.load("search-entry");
		node.querySelector(".search-entry-name").textContent = food.name;
		node.querySelector(".search-entry").addEventListener("click", () => addMenuItem(food));
		nodes.push(node);
	}
	searchEntries.replaceChildren(...nodes);
}

async function addMenuItem(food) {
	const alreadyAddedMenuItem = document.querySelector(`#food-menu .menu-item[data-food-name="${food.name}"]`);
	if (alreadyAddedMenuItem !== null) {
		alreadyAddedMenuItem.style.animation = "highlight 0.25s linear";
		setTimeout(() => alreadyAddedMenuItem.style.animation = "", 250);
		return;
	}

	const node = await JST.load("menu-item");
	const nodeRoot = node.querySelector(".menu-item");
	const itemAmount = node.querySelector(".menu-item-amount");
	const kcalAmount = node.querySelector(".menu-item-kcal-for-amount");
	const score = node.querySelector(".menu-item-score");
	nodeRoot.setAttribute("data-food-name", food.name);
	node.querySelector(".menu-item-name").textContent = food.name;
	node.querySelector(".menu-item-kcal").textContent = `${food.kcal} kcal/100${food.unit}`;
	node.querySelector(".menu-item-unit").textContent = food.unit;

	score.textContent = food.density.toFixed(1);
	score.classList.add(getScoreColor(food.density, food.unit));

	node.querySelector(".menu-item-info-unit").textContent = `Nährwerte pro 100${food.unit}`;
	node.querySelector(".menu-item-info-energy-value").textContent = `${food.kcal}kcal`;
	node.querySelector(".menu-item-info-fat-value").textContent = `${food.fat}g`;
	node.querySelector(".menu-item-info-carbs-value").textContent = `${food.carbs}g`;
	node.querySelector(".menu-item-info-sugar-value").textContent = `${food.sugar}g`;
	node.querySelector(".menu-item-info-proteins-value").textContent = `${food.proteins}g`;
	node.querySelector(".menu-item-info-alc-value").textContent = `${food.alc}%`;

	node.querySelector(".delete-menu-item").addEventListener("click", () => {
		foodMenu.removeChild(nodeRoot);
		updateSummary();
	});

	const updateKcalAmount = () => {
		if (!/[0-9]+/.test(itemAmount.value)) {
			console.log("no match");
			return;
		}
		const amount = parseInt(itemAmount.value);
		kcalAmount.textContent = parseInt(Math.round(food.kcal / 100 * amount));
		updateSummary();
	}

	itemAmount.value = 100;
	itemAmount.addEventListener("input", updateKcalAmount);

	updateKcalAmount();
	foodMenu.appendChild(node);
	updateSummary();
}

function updateSummary() {
	let sum = 0;

	for (let menuItem of foodMenu.querySelectorAll(".menu-item")) {
		sum += parseInt(menuItem.querySelector(".menu-item-kcal-for-amount").textContent);
	}

	summaryKcal.textContent = sum;
	summary.style.display = sum > 0 ? "block" : "none";
}

function getScoreColor(density, unit) {
	switch (unit) {
		case "g": {
			if (density >= 2.4) {
				return "red"
			} else if (density >= 1.7) {
				return "orange"
			} else {
				return "green";
			}
		}
		
		case "ml": {
			if (density >= 0.3) {
				return "red"
			} else {
				return "green";
			}
		}
	}
}