const sourcesConfigUrl = "./data/sources.json";

const state = {
	allGames: [],
	mergedGames: [],
	search: "",
	sourceFilter: "all",
	sortBy: "title",
	sources: [],
};

const ui = {
	grid: document.getElementById("gamesGrid"),
	summary: document.getElementById("summary"),
	searchInput: document.getElementById("searchInput"),
	sourceFilter: document.getElementById("sourceFilter"),
	sortSelect: document.getElementById("sortSelect"),
	refreshButton: document.getElementById("refreshButton"),
	template: document.getElementById("gameCardTemplate"),
};

const normalizeTitle = (title) =>
	title.toLowerCase().replace(/[:\-]/g, " ").replace(/\s+/g, " ").trim();

const toDateValue = (value) => (value ? new Date(value).getTime() : 0);

const mergeGames = (games) => {
	const map = new Map();

	games.forEach((game) => {
		const key = game.canonicalId || normalizeTitle(game.title);
		const entry = map.get(key) || {
			title: game.title,
			canonicalId: key,
			platforms: new Set(),
			sources: [],
			tags: new Set(),
			lastPlayed: null,
			playtimeHours: 0,
		};

		entry.platforms.add(game.platform);
		game.tags?.forEach((tag) => entry.tags.add(tag));
		entry.sources.push({
			name: game.source,
			id: game.id,
			url: game.url,
			platform: game.platform,
		});

		if (
			game.lastPlayed &&
			(!entry.lastPlayed || game.lastPlayed > entry.lastPlayed)
		) {
			entry.lastPlayed = game.lastPlayed;
		}

		if (Number.isFinite(game.playtimeHours)) {
			entry.playtimeHours += game.playtimeHours;
		}

		map.set(key, entry);
	});

	return Array.from(map.values()).map((entry) => ({
		...entry,
		platforms: Array.from(entry.platforms),
		tags: Array.from(entry.tags),
	}));
};

const sortGames = (games, sortBy) => {
	const sorted = [...games];
	sorted.sort((a, b) => {
		if (sortBy === "lastPlayed") {
			return toDateValue(b.lastPlayed) - toDateValue(a.lastPlayed);
		}
		if (sortBy === "platforms") {
			return b.platforms.length - a.platforms.length;
		}
		return a.title.localeCompare(b.title, "de");
	});
	return sorted;
};

const filterGames = () => {
	const query = state.search.trim().toLowerCase();
	let filtered = [...state.mergedGames];

	if (state.sourceFilter !== "all") {
		filtered = filtered.filter((game) =>
			game.sources.some((source) => source.name === state.sourceFilter),
		);
	}

	if (query) {
		filtered = filtered.filter((game) => {
			const haystack = [
				game.title,
				...game.platforms,
				...game.tags,
				...game.sources.map((source) => source.name),
			]
				.join(" ")
				.toLowerCase();
			return haystack.includes(query);
		});
	}

	return sortGames(filtered, state.sortBy);
};

const renderSummary = (games) => {
	const totalGames = state.mergedGames.length;
	const totalSources = state.sources.length;
	const duplicates = state.allGames.length - state.mergedGames.length;
	const totalPlaytime = state.allGames.reduce(
		(sum, game) => sum + (game.playtimeHours || 0),
		0,
	);

	ui.summary.innerHTML = [
		{
			label: "Konsolidierte Spiele",
			value: totalGames,
		},
		{
			label: "Quellen",
			value: totalSources,
		},
		{
			label: "Zusammengeführte Duplikate",
			value: Math.max(duplicates, 0),
		},
		{
			label: "Gesamte Spielzeit (h)",
			value: totalPlaytime.toFixed(1),
		},
	]
		.map(
			(item) => `
        <div class="summary-card">
          <h3>${item.label}</h3>
          <p>${item.value}</p>
        </div>
      `,
		)
		.join("");
};

const renderGames = (games) => {
	ui.grid.innerHTML = "";

	games.forEach((game) => {
		const card = ui.template.content.cloneNode(true);
		card.querySelector(".title").textContent = game.title;
		card.querySelector(".badge").textContent =
			`${game.platforms.length} Plattformen`;
		card.querySelector(".meta").textContent = game.lastPlayed
			? `Zuletzt gespielt: ${new Date(game.lastPlayed).toLocaleDateString("de")}`
			: "Noch nicht gespielt";

		const tagList = card.querySelector(".tag-list");
		game.tags.slice(0, 4).forEach((tag) => {
			const span = document.createElement("span");
			span.className = "tag";
			span.textContent = tag;
			tagList.appendChild(span);
		});

		if (!game.tags.length) {
			const span = document.createElement("span");
			span.className = "tag";
			span.textContent = "Ohne Tags";
			tagList.appendChild(span);
		}

		const sources = card.querySelector(".sources");
		game.sources.forEach((source) => {
			const item = document.createElement("div");
			item.className = "source-item";
			const name = document.createElement("span");
			name.textContent = source.name;
			const details = document.createElement("p");
			details.textContent = `${source.platform} · ${source.id}`;
			item.append(name, details);
			sources.appendChild(item);
		});

		ui.grid.appendChild(card);
	});
};

const populateSourceFilter = () => {
	ui.sourceFilter.innerHTML = '<option value="all">Alle Quellen</option>';
	state.sources.forEach((source) => {
		const option = document.createElement("option");
		option.value = source.name;
		option.textContent = source.label;
		ui.sourceFilter.appendChild(option);
	});
};

const updateUI = () => {
	const filtered = filterGames();
	renderSummary(filtered);
	renderGames(filtered);
};

const loadSources = async () => {
	const response = await fetch(sourcesConfigUrl);
	if (!response.ok) {
		throw new Error("Konnte sources.json nicht laden.");
	}

	const config = await response.json();
	state.sources = config.sources;

	const data = await Promise.all(
		config.sources.map(async (source) => {
			const sourceResponse = await fetch(source.file);
			if (!sourceResponse.ok) {
				throw new Error(`Konnte ${source.file} nicht laden.`);
			}
			const list = await sourceResponse.json();
			return list.map((game) => ({
				...game,
				source: source.name,
				platform: game.platform || source.platform,
			}));
		}),
	);

	state.allGames = data.flat();
	state.mergedGames = mergeGames(state.allGames);
};

const attachEvents = () => {
	ui.searchInput.addEventListener("input", (event) => {
		state.search = event.target.value;
		updateUI();
	});

	ui.sourceFilter.addEventListener("change", (event) => {
		state.sourceFilter = event.target.value;
		updateUI();
	});

	ui.sortSelect.addEventListener("change", (event) => {
		state.sortBy = event.target.value;
		updateUI();
	});

	ui.refreshButton.addEventListener("click", async () => {
		ui.refreshButton.disabled = true;
		ui.refreshButton.textContent = "Lade ...";
		try {
			await loadSources();
			populateSourceFilter();
			updateUI();
		} finally {
			ui.refreshButton.disabled = false;
			ui.refreshButton.textContent = "Daten neu laden";
		}
	});
};

const init = async () => {
	try {
		await loadSources();
		populateSourceFilter();
		attachEvents();
		updateUI();
	} catch (error) {
		ui.grid.innerHTML = `<div class="card">${error.message}</div>`;
	}
};

init();