page.js

var stats = {};
var filters = [];

function onPageLoaded() {
	fetch('data.json').then(response => {
		return response.json();
	}).then(data => {
		console.log("data:", data);
		stats = computeStats(data);
		console.log("stats:", stats);

		renderPage(stats, filters);

		renderCharts(stats);
	});
}

function renderPage(stats, filters) {
	// Fill out the clear filters button.
	{
		let button = document.getElementById("clearfilters");
		if (filters.length == 0) {
			button.disabled = true;
			button.innerHTML = "Clear filters";
		} else {
			button.disabled = false;
			if (filters.length == 1) {
				button.innerHTML = "Clear 1 filter";
			} else {
				button.innerHTML = "Clear " + filters.length + " filters";
			}
		}
	}

	// Fill out the seasons table.
	{
		let tbody = document.getElementById("seasons_tbody");
		while (tbody.firstChild) {
			tbody.removeChild(tbody.firstChild);
		}

		for (let i = 0; i < stats.seasons.length; i++) {
			let season = stats.seasons[i];
			if (!seasonPassesFilter(season, filters)) {
				continue;
			}

			let newRow = document.createElement("tr");
			let newColumn = null;

			newColumn = document.createElement("td");
			newColumn.appendChild(document.createTextNode(season.title));
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (season.episodes.length) {
				newColumn.appendChild(document.createTextNode(season.episodes.length));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (season.hosts.length) {
				newColumn.appendChild(document.createTextNode(season.hosts.length));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (season.players.length) {
				newColumn.appendChild(document.createTextNode(season.players.length));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (season.teams.length) {
				newColumn.appendChild(document.createTextNode(season.teams.length));
			}
			newRow.appendChild(newColumn);

			tbody.appendChild(newRow);
		}
	}

	// Fill out the episodes table.
	{
		let tbody = document.getElementById("episodes_tbody");
		while (tbody.firstChild) {
			tbody.removeChild(tbody.firstChild);
		}

		for (let i = 0; i < stats.episodes.length; i++) {
			let episode = stats.episodes[i];
			if (!episodePassesFilter(episode, filters)) {
				continue;
			}

			let newRow = document.createElement("tr");
			let newColumn = null;

			newColumn = document.createElement("td");
			{
				let link = document.createElement("a");
				link.href = episode.url;
				link.target = "_blank";
				let image = document.createElement("img");
				image.className = "episode-thumbnail";
				image.src = episode.thumbnail_landscape;
				//link.appendChild(document.createTextNode("🔗"));
				link.appendChild(image);
				newColumn.appendChild(link);
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.appendChild(createFilterLink(episode.season_and_number, { type: "episode", id: episode.dropouttv_productid, role: "*" }));
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.appendChild(createFilterLink(episode.title, { type: "episode", id: episode.dropouttv_productid, role: "*" }));
			{
				newColumn.appendChild(document.createElement("br"));
				let span = document.createElement("span");
				span.className = "description";
				span.appendChild(document.createTextNode(episode.description));
				newColumn.appendChild(span);
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.appendChild(document.createTextNode(computeDurationString(episode.duration)));
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (Array.isArray(episode.questions)) {
				newColumn.appendChild(document.createTextNode(episode.questions.length));
			} else {
				newColumn.appendChild(document.createTextNode("TBD"));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "center"
			{
				let div = document.createElement('div');
				div.className = "person host";
				div.appendChild(createFilterLink(episode.host_name, { type: "person", id: episode.host, role: "host" }));
				newColumn.appendChild(div);

				if (episode.fact_checker) {
					div = document.createElement('div');
					div.appendChild(document.createTextNode('/'));
					newColumn.appendChild(div);

					div = document.createElement('div');
					div.className = "person fact-checker";
					div.appendChild(createFilterLink(episode.fact_checker_name, { type: "person", id: episode.fact_checker, role: "fact-checker" }));
					newColumn.appendChild(div);
				}
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			if (Array.isArray(episode.players)) {
				for (let p = 0; p < episode.players.length; p++) {
					let player = episode.players[p];
					let span = document.createElement("div");
					switch (player.place) {
						case 1:
							span.className = "person first";
							break;
						case 2:
							span.className = "person second";
							break;
						case 3:
							span.className = "person third";
							break;
					}
					let podium = document.createElement("span");
					podium.className = "podium " + player.color;
					span.appendChild(podium);
					span.appendChild(createFilterLink(player.name, { type: "person", id: player.id, role: "player" }));
					span.appendChild(document.createTextNode(" (" + player.score + ")"));
					if (player.notes) {
						span.appendChild(document.createTextNode(" "));

						let abbr = document.createElement("abbr");
						abbr.setAttribute("title", player.notes);
						abbr.appendChild(document.createTextNode("*"));
						span.appendChild(abbr);
					}
					newColumn.appendChild(span);
				}
				newRow.appendChild(newColumn);
			}
			if (Array.isArray(episode.teams)) {
				for (let t = 0; t < episode.teams.length; t++) {
					let team = episode.teams[t];
					let span = document.createElement("div");
					switch (team.place) {
						case 1:
							span.className = "person first";
							break;
						case 2:
							span.className = "person second";
							break;
						case 3:
							span.className = "person third";
							break;
					}
					let podium = document.createElement("span");
					podium.className = "podium " + team.color;
					span.appendChild(podium);
					span.appendChild(createFilterLink(team.name, { type: "team", id: team.id, role: "player" }));
					span.appendChild(document.createTextNode(" (" + team.score + ")"));
					if (team.notes) {
						span.appendChild(document.createTextNode(" "));

						let abbr = document.createElement("abbr");
						abbr.setAttribute("title", team.notes);
						abbr.appendChild(document.createTextNode("*"));
						span.appendChild(abbr);
					}
					newColumn.appendChild(span);
				}
				newRow.appendChild(newColumn);
			}

			tbody.appendChild(newRow);
		}
	}

	// Fill out the questions table.
	{
		let tbody = document.getElementById("questions_tbody");
		while (tbody.firstChild) {
			tbody.removeChild(tbody.firstChild);
		}

		for (let i = 0; i < stats.episodes.length; i++) {
			let episode = stats.episodes[i];
			if (!episodePassesFilter(episode, filters)) {
				continue;
			}

			for (let q = 0; q < episode.questions.length; q++) {
				let question = episode.questions[q];

				let topic = null;
				if (question.topic) {
					topic = stats.questionTopics.find(item => item.id === question.topic);
				}
				if (!topicPassesFilter(topic, filters.filter(item => item.type === "topic"))) {
					continue;
				}

				let title = null;
				if (question.title) {
					title = stats.questionTitles.find(item => item.name === question.title);
				}
				if (!titlePassesFilter(title, filters.filter(item => item.type === "title"))) {
					continue;
				}

				let playerFilters = filters.filter(item => item.type === "person");
				if (playerFilters.length > 0) {
					let somePlayerMatches = false;
					for (let p = 0; p < question.winners.length; p++) {
						let playerId = question.winners[p];
						let person = stats.people.find(item => item.id === playerId);

						if (personPassesFilter(person, playerFilters)) {
							somePlayerMatches = true;
							break;
						}
					}
					if (!somePlayerMatches) {
						continue;
					}
				}

				let newRow = document.createElement("tr");
				let newColumn = null;

				newColumn = document.createElement("td");
				newColumn.appendChild(createFilterLink(episode.season_and_number, { type: "episode", id: episode.dropouttv_productid, role: "*" }));
				newRow.appendChild(newColumn);

				newColumn = document.createElement("td");
				newColumn.className = "number";
				newColumn.appendChild(document.createTextNode(question.number));
				newRow.appendChild(newColumn);

				newColumn = document.createElement("td");
				if (topic) {
					newColumn.appendChild(createFilterLink(topic.name, { type: "topic", id: topic.id, role: "*" }));
					if (question.submittedBy) {
						let abbr = document.createElement("abbr");
						abbr.title = "Submitted by " + question.submittedBy;
						let sup = document.createElement("sup");
						sup.appendChild(document.createTextNode(question.submittedBy));
						abbr.appendChild(sup);
						newColumn.appendChild(abbr);
					}
				}
				if (Array.isArray(question.topicDetails)) {
					newColumn.appendChild(document.createElement("br"));
					let span = document.createElement("span");
					span.className = "topic-details";
					span.appendChild(document.createTextNode(question.topicDetails.join(", ")));
					newColumn.appendChild(span);
				}
				newRow.appendChild(newColumn);

				newColumn = document.createElement("td");
				if (title) {
					newColumn.appendChild(createFilterLink(title.name, { type: "title", id: title.name, role: "*" }));
				}
				newRow.appendChild(newColumn);

				newColumn = document.createElement("td");
				for (let p = 0; p < question.winners.length; p++) {
					if (Array.isArray(episode.players)) {
						let playerId = question.winners[p];
						let player = episode.players.find(item => item.id === playerId);

						let span = document.createElement("div");
						let podium = document.createElement("span");
						podium.className = "podium " + player.color;
						span.appendChild(podium);
						span.appendChild(createFilterLink(player.name, { type: "person", id: player.id, role: "player" }));
						newColumn.appendChild(span);
					}
					if (Array.isArray(episode.teams)) {
						let teamId = question.winners[p];
						let team = episode.teams.find(item => item.id === teamId);

						let span = document.createElement("div");
						let podium = document.createElement("span");
						podium.className = "podium " + team.color;
						span.appendChild(podium);
						span.appendChild(createFilterLink(team.name, { type: "team", id: team.id, role: "player" }));
						newColumn.appendChild(span);
					}
				}
				newRow.appendChild(newColumn);

				tbody.appendChild(newRow);
			}
		}
	}

	// Fill out the people table.
	{
		let tbody = document.getElementById("people_tbody");
		while (tbody.firstChild) {
			tbody.removeChild(tbody.firstChild);
		}

		for (let i = 0; i < stats.people.length; i++) {
			let person = stats.people[i];
			if (!personPassesFilter(person, filters)) {
				continue;
			}

			let newRow = document.createElement("tr");
			let newColumn = null;

			newColumn = document.createElement("td");
			newColumn.className = "person";
			newColumn.appendChild(createFilterLink(person.name, { type: "person", id: person.id, role: "*" }));
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (person.appearances.length > 0) {
				newColumn.appendChild(createFilterLink(person.appearances.length, { type: "person", id: person.id, role: "*" }));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (person.times_hosted.length) {
				newColumn.appendChild(createFilterLink(person.times_hosted.length, { type: "person", id: person.id, role: "host" }));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (person.times_fact_checked.length) {
				newColumn.appendChild(createFilterLink(person.times_fact_checked.length, { type: "person", id: person.id, role: "fact-checker" }));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (person.times_first.length) {
				let link = createFilterLink(person.times_first.length, { type: "person", id: person.id, role: "first" });
				link.classList.add("first");
				newColumn.appendChild(link);
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (person.times_second.length) {
				let link = createFilterLink(person.times_second.length, { type: "person", id: person.id, role: "second" });
				link.classList.add("second");
				newColumn.appendChild(link);
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (person.times_third.length) {
				let link = createFilterLink(person.times_third.length, { type: "person", id: person.id, role: "third" });
				link.classList.add("third");
				newColumn.appendChild(link);
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (person.time_until_first_point.average !== null) {
				newColumn.appendChild(document.createTextNode(person.time_until_first_point.average.toFixed(1)));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (person.time_until_first_point.average !== null) {
				newColumn.appendChild(document.createTextNode(" (" + (person.time_until_first_point.minimum != person.time_until_first_point.maximum ? person.time_until_first_point.minimum + " - " : "") + person.time_until_first_point.maximum + ")"));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (person.high_score.average !== null) {
				newColumn.appendChild(document.createTextNode(person.high_score.average.toFixed(1)));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (person.high_score.average !== null) {
				newColumn.appendChild(document.createTextNode(" (" + (person.high_score.minimum != person.high_score.maximum ? person.high_score.minimum + " - " : "") + person.high_score.maximum + ")"));
			}
			newRow.appendChild(newColumn);

			tbody.appendChild(newRow);
		}
	}

	// Fill out the teams table.
	{
		let tbody = document.getElementById("teams_tbody");
		while (tbody.firstChild) {
			tbody.removeChild(tbody.firstChild);
		}

		for (let i = 0; i < stats.teams.length; i++) {
			let team = stats.teams[i];
			if (!teamPassesFilter(team, filters)) {
				continue;
			}

			let newRow = document.createElement("tr");
			let newColumn = null;

			newColumn = document.createElement("td");
			newColumn.className = "person";
			newColumn.appendChild(createFilterLink(team.name, { type: "team", id: team.id, role: "player" }));
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			for (let p = 0; p < team.players.length; p++) {
				let span = document.createElement("div");
				let player = stats.people.find(item => item.id == team.players[p]);
				span.appendChild(createFilterLink(player.name, { type: "person", id: player.id, role: "player" }));
				newColumn.appendChild(span);
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (team.appearances.length > 0) {
				newColumn.appendChild(createFilterLink(team.appearances.length, { type: "team", id: team.id, role: "*" }));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (team.times_first.length) {
				newColumn.appendChild(createFilterLink(team.times_first.length, { type: "team", id: team.id, role: "first" }));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (team.times_second.length) {
				newColumn.appendChild(createFilterLink(team.times_second.length, { type: "team", id: team.id, role: "second" }));
			}
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (team.times_third.length) {
				newColumn.appendChild(createFilterLink(team.times_third.length, { type: "team", id: team.id, role: "third" }));
			}
			newRow.appendChild(newColumn);

			tbody.appendChild(newRow);
		}
	}

	// Fill out the topics table.
	{
		let tbody = document.getElementById("topics_tbody");
		while (tbody.firstChild) {
			tbody.removeChild(tbody.firstChild);
		}

		for (let i = 0; i < stats.questionTopics.length; i++) {
			let topic = stats.questionTopics[i];
			if (!topicPassesFilter(topic, filters)) {
				continue;
			}

			let newRow = document.createElement("tr");
			let newColumn = null;

			newColumn = document.createElement("td");
			newColumn.appendChild(createFilterLink(topic.name, { type: "topic", id: topic.id, role: "*" }));
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (topic.episodes.length) {
				newColumn.appendChild(createFilterLink(topic.episodes.length, { type: "topic", id: topic.id, role: "*" }));
			}
			newRow.appendChild(newColumn);

			tbody.appendChild(newRow);
		}
	}

	// Fill out the titles table.
	{
		let tbody = document.getElementById("titles_tbody");
		while (tbody.firstChild) {
			tbody.removeChild(tbody.firstChild);
		}

		for (let i = 0; i < stats.questionTitles.length; i++) {
			let title = stats.questionTitles[i];
			if (!titlePassesFilter(title, filters)) {
				continue;
			}

			let newRow = document.createElement("tr");
			let newColumn = null;

			newColumn = document.createElement("td");
			newColumn.appendChild(createFilterLink(title.name, { type: "title", id: title.name, role: "*" }));
			newRow.appendChild(newColumn);

			newColumn = document.createElement("td");
			newColumn.className = "number";
			if (title.episodes.length) {
				newColumn.appendChild(createFilterLink(title.episodes.length, { type: "title", id: title.name, role: "*" }));
			}
			newRow.appendChild(newColumn);

			tbody.appendChild(newRow);
		}
	}
}

function computeDurationString(timeInSeconds) {
	timeInSeconds = parseInt(timeInSeconds);
	let hours = parseInt(timeInSeconds / 3600);
	let remainder = timeInSeconds - hours * 3600;
	let minutes = parseInt(remainder / 60);
	let seconds = remainder - minutes * 60;

	let durationString = "";
	if (hours > 0) {
		durationString += hours + "h";
	}
	if (seconds < 10) {
		seconds = "0" + seconds;
	}
	durationString += minutes + "m" + seconds + "s";
	return durationString;
}

function clearFilters() {
	console.log("clearFilters: Clearing filters.");
	filters = [];
	renderPage(stats, filters);
}

function addFilter(newFilter) {
	console.log("addFilter: filters:", filters);
	console.log("addFilter: newFilter:", newFilter);

	let changed = false;
	for (let i = 0; i < filters.length; i++) {
		let filter = filters[i];
		if (filtersAreSimilar(filter, newFilter)) {
			filters[i] = newFilter;
			changed = true;
			console.log("addFilter: Changed i:", i);
			break;
		}
	}
	if (!changed) {
		filters.push(newFilter);
		console.log("addFilter: Added.");
	}
	renderPage(stats, filters);
}

function filtersAreSimilar(a, b) {
	return (a.type == b.type && a.id == b.id);
}

function filtersAreEqual(a, b) {
	return (a.type == b.type && a.id == b.id && a.role == b.role);
}

function removeFilter(newFilter) {
	console.log("removeFilter: filters:", filters);
	console.log("removeFilter: newFilter:", newFilter);
	for (let i = 0; i < filters.length; i++) {
		let filter = filters[i];

		if (filtersAreEqual(filter, newFilter)) {
			filters.splice(i, 1);
			console.log("removeFilter: Removed from i:", i);
			renderPage(stats, filters);
			return;
		}
	}
}

function hasFilter(newFilter) {
	for (let i = 0; i < filters.length; i++) {
		let filter = filters[i];

		if (filtersAreEqual(filter, newFilter)) {
			return true;
		}
	}
	return false;
}

function createFilterLink(title, filter) {
	let newFilter = !hasFilter(filter);

	let link = document.createElement("span");
	link.className = "link";
	if (newFilter) {
		link.className += " filter-off";
	} else {
		link.className += " filter-on";
	}
	link.onclick = () => {
		if (newFilter) {
			addFilter(filter);
		} else {
			removeFilter(filter);
		}
	}
	link.appendChild(document.createTextNode(title));
	return link;
}

function seasonPassesFilter(season, filters) {
	let match = true;

	for (let i = 0; i < filters.length; i++) {
		let filter = filters[i];
		switch (filter.type) {
			case "episode":
				if (!season.episodes.includes(filter.id)) {
					match = false;
				}
				break;
			case "topic":
				if (!season.questionTopics.includes(filter.id)) {
					match = false;
				}
				break;
			case "title":
				if (!season.questionTitles.includes(filter.id)) {
					match = false;
				}
				break;
			case "person":
				switch (filter.role) {
					case "host":
						if (!season.hosts.includes(filter.id)) {
							match = false;
						}
						break;
					case "fact-checker":
						if (!season.factCheckers.includes(filter.id)) {
							match = false;
						}
						break;
					case "player":
						if (!season.players.includes(filter.id)) {
							match = false;
						}
						break;
					case "*":
						if (!season.hosts.includes(filter.id) && !season.players.includes(filter.id)) {
							match = false;
						}
						break;
					case "first":
						if (!season.firstIds.includes(filter.id)) {
							match = false;
						}
						break;
					case "second":
						if (!season.secondIds.includes(filter.id)) {
							match = false;
						}
						break;
					case "third":
						if (!season.thirdIds.includes(filter.id)) {
							match = false;
						}
						break;
					default:
						console.warn("seasonPassesFilter: Unhandled person role:", filter.role);
						match = false;
				}
				break;
			case "team":
				switch (filter.role) {
					case "player":
						if (!season.teams.includes(filter.id)) {
							match = false;
						}
						break;
					case "*":
						if (!season.teams.includes(filter.id)) {
							match = false;
						}
						break;
					case "first":
						if (!season.firstIds.includes(filter.id)) {
							match = false;
						}
						break;
					case "second":
						if (!season.secondIds.includes(filter.id)) {
							match = false;
						}
						break;
					case "third":
						if (!season.thirdIds.includes(filter.id)) {
							match = false;
						}
						break;
					default:
						console.warn("seasonPassesFilter: Unhandled team role:", filter.role);
						match = false;
				}
				break;
			default:
				console.warn("seasonPassesFilter: Unhandled type:", filter.type);
				match = false;
		}
	}

	return match;
}

function episodePassesFilter(episode, filters) {
	let match = true;

	for (let i = 0; i < filters.length; i++) {
		let filter = filters[i];
		switch (filter.type) {
			case "episode":
				if (episode.dropouttv_productid != filter.id) {
					match = false;
				}
				break;
			case "topic":
				if (!episode.questionTopics.includes(filter.id)) {
					match = false;
				}
				break;
			case "title":
				if (!episode.questionTitles.includes(filter.id)) {
					match = false;
				}
				break;
			case "person":
				switch (filter.role) {
					case "host":
						if (episode.host != filter.id) {
							match = false;
						}
						break;
					case "fact-checker":
						if (episode.fact_checker != filter.id) {
							match = false;
						}
						break;
					case "player":
						if (!episode.playerIds.includes(filter.id)) {
							match = false;
						}
						break;
					case "*":
						if (episode.host != filter.id && !episode.playerIds.includes(filter.id)) {
							match = false;
						}
						break;
					case "first":
						if (!episode.firstIds.includes(filter.id)) {
							match = false;
						}
						break;
					case "second":
						if (!episode.secondIds.includes(filter.id)) {
							match = false;
						}
						break;
					case "third":
						if (!episode.thirdIds.includes(filter.id)) {
							match = false;
						}
						break;
					default:
						console.warn("episodePassesFilter: Unhandled person role:", filter.role);
						match = false;
				}
				break;
			case "team":
				switch (filter.role) {
					case "player":
						if (!episode.teamIds.includes(filter.id)) {
							match = false;
						}
						break;
					case "*":
						if (!episode.teamIds.includes(filter.id)) {
							match = false;
						}
						break;
					case "first":
						if (!episode.firstIds.includes(filter.id)) {
							match = false;
						}
						break;
					case "second":
						if (!episode.secondIds.includes(filter.id)) {
							match = false;
						}
						break;
					case "third":
						if (!episode.thirdIds.includes(filter.id)) {
							match = false;
						}
						break;
					default:
						console.warn("episodePassesFilter: Unhandled team role:", filter.role);
						match = false;
				}
				break;
			default:
				console.warn("episodePassesFilter: Unhandled type:", filter.type);
				match = false;
		}
	}

	return match;
}

function topicPassesFilter(topic, filters) {
	let match = false;

	if (filters.length == 0) {
		return true;
	}

	if (!topic) {
		return false;
	}

	for (let i = 0; i < filters.length; i++) {
		let filter = filters[i];
		switch (filter.type) {
			case "episode":
				if (topic.episodes.includes(filter.id)) {
					match = true;
				}
				break;
			case "topic":
				if (topic.id == filter.id) {
					match = true;
				}
				break;
			case "title":
				// TODO
				break;
			case "person":
				if (topic.players.includes(filter.id)) {
					match = true;
				}
				break;
			case "team":
				if (topic.teams.includes(filter.id)) {
					match = true;
				}
				break;
			default:
				console.warn("topicPassesFilter: Unhandled type:", filter.type);
				match = false;
		}
	}

	return match;
}

function titlePassesFilter(title, filters) {
	let match = false;

	if (filters.length == 0) {
		return true;
	}

	if (!title) {
		return false;
	}

	for (let i = 0; i < filters.length; i++) {
		let filter = filters[i];
		switch (filter.type) {
			case "episode":
				if (title.episodes.includes(filter.id)) {
					match = true;
				}
				break;
			case "topic":
				// TODO
				break;
			case "title":
				if (title.name == filter.id) {
					match = true;
				}
				break;
			case "person":
				if (title.players.includes(filter.id)) {
					match = true;
				}
				break;
			case "team":
				if (title.teams.includes(filter.id)) {
					match = true;
				}
				break;
			default:
				console.warn("titlePassesFilter: Unhandled type:", filter.type);
				match = false;
		}
	}

	return match;
}

function personPassesFilter(person, filters) {
	let match = false;

	if (filters.length == 0) {
		return true;
	}

	if (!person) {
		return false;
	}

	for (let i = 0; i < filters.length; i++) {
		let filter = filters[i];
		switch (filter.type) {
			case "episode":
				if (person.appearances.includes(filter.id)) {
					match = true;
				}
				break;
			case "topic":
				if (person.topics.includes(filter.id)) {
					match = true;
				}
				break;
			case "title":
				if (person.titles.includes(filter.id)) {
					match = true;
				}
				break;
			case "person":
				if (person.id == filter.id) {
					match = true;
				}
				break;
			case "team":
				if (person.teams.includes(filter.id)) {
					match = true;
				}
				break;
			default:
				console.warn("personPassesFilter: Unhandled type:", filter.type);
				match = false;
		}
	}

	return match;
}

function teamPassesFilter(team, filters) {
	let match = false;

	if (filters.length == 0) {
		return true;
	}

	if (!team) {
		return false;
	}

	for (let i = 0; i < filters.length; i++) {
		let filter = filters[i];
		switch (filter.type) {
			case "episode":
				if (team.appearances.includes(filter.id)) {
					match = true;
				}
				break;
			case "topic":
				if (team.topics.includes(filter.id)) {
					match = true;
				}
				break;
			case "title":
				if (team.titles.includes(filter.id)) {
					match = true;
				}
				break;
			case "person":
				if (team.players.includes(filter.id)) {
					match = true;
				}
				break;
			case "team":
				if (team.id == filter.id) {
					match = true;
				}
				break;
			default:
				console.warn("teamPassesFilter: Unhandled type:", filter.type);
				match = false;
		}
	}

	return match;
}

function computeStats(data) {
	let stats = {
		"seasons": [],
		"episodes": [],
		"people": [],
		"teams": [],
		"questionTopics": [],
		"questionTitles": [],
	};

	let seasonMap = {};
	for (let i = 0; i < data.seasons.length; i++) {
		let season = JSON.parse(JSON.stringify(data.seasons[i]));
		season.episodes = [];
		season.hostMap = {};
		season.factCheckerMap = {};
		season.playerMap = {};
		season.teamMap = {};
		season.firstMap = {};
		season.secondMap = {};
		season.thirdMap = {};
		season.questionTopics = [];
		season.questionTitles = [];
		seasonMap[season.number] = season;
	}

	let peopleMap = {};
	for (let i = 0; i < data.people.length; i++) {
		let person = JSON.parse(JSON.stringify(data.people[i]));
		person.times_hosted = [];
		person.times_fact_checked = [];
		person.times_played = [];
		person.times_first = [];
		person.times_second = [];
		person.times_third = [];
		person.appearances = [];
		person.topics = [];
		person.titles = [];
		person.teams = [];
		person.time_until_first_point = {
			average: null,
			minimum: null,
			maximum: null,
			_sum: 0,
			_count: 0,
		};
		person.high_score = {
			average: null,
			minimum: null,
			maximum: null,
			_sum: 0,
			_count: 0,
		};
		peopleMap[person.id] = person;
	}

	let teamMap = {};
	for (let i = 0; i < data.teams.length; i++) {
		let team = JSON.parse(JSON.stringify(data.teams[i]));
		team.times_played = [];
		team.times_first = [];
		team.times_second = [];
		team.times_third = [];
		team.appearances = [];
		team.topics = [];
		team.titles = [];
		teamMap[team.id] = team;
	}

	let questionTopicMap = {};
	for (let i = 0; i < data.topics.length; i++) {
		let topic = JSON.parse(JSON.stringify(data.topics[i]));
		topic.episodes = [];
		topic.players = [];
		topic.teams = [];
		questionTopicMap[topic.id] = topic;
	}

	let questionTitleMap = {};
	for (let i = 0; i < data.titles.length; i++) {
		let title = JSON.parse(JSON.stringify(data.titles[i]));
		title.episodes = [];
		title.players = [];
		title.teams = [];
		questionTitleMap[title.name] = title;
	}

	// Note which people are in which teams.
	Object.keys(teamMap).forEach(teamId => {
		let team = teamMap[teamId];
		team.players.forEach(playerId => {
			let player = peopleMap[playerId];
			player.teams.push(teamId);
		});
	});

	for (let i = 0; i < data.episodes.length; i++) {
		let episode = JSON.parse(JSON.stringify(data.episodes[i]));
		{
			episode.season_and_number = "S";
			let n = Number.parseInt(episode.season_number);
			if (n < 10) {
				episode.season_and_number += "0";
			}
			episode.season_and_number += n;
			episode.season_and_number += "E";
			n = Number.parseInt(episode.number);
			if (n < 10) {
				episode.season_and_number += "0";
			}
			episode.season_and_number += n;
		}

		seasonMap[episode.season_number].episodes.push(episode.dropouttv_productid);

		let hostId = episode.host;
		episode.host_name = peopleMap[hostId].name;

		peopleMap[hostId].times_hosted.push(episode.dropouttv_productid);
		peopleMap[hostId].appearances.push(episode.dropouttv_productid);
		seasonMap[episode.season_number].hostMap[hostId] = true;

		let factCheckerId = episode.fact_checker;
		if (factCheckerId) {
			episode.fact_checker_name = peopleMap[factCheckerId].name;

			peopleMap[factCheckerId].times_fact_checked.push(episode.dropouttv_productid);
			peopleMap[factCheckerId].appearances.push(episode.dropouttv_productid);
			seasonMap[episode.season_number].factCheckerMap[factCheckerId] = true;
		}

		let scores = [];
		if (Array.isArray(episode.players)) {
			for (let p = 0; p < episode.players.length; p++) {
				let player = episode.players[p];
				if (!scores.includes(player.score)) {
					scores.push(player.score);
				}
			}
			scores.sort((a, b) => b - a);
		}
		if (Array.isArray(episode.teams)) {
			for (let t = 0; t < episode.teams.length; t++) {
				let team = episode.teams[t];
				if (!scores.includes(team.score)) {
					scores.push(team.score);
				}
			}
			scores.sort((a, b) => b - a);
		}

		let scoreMap = {};
		for (let s = 0; s < scores.length; s++) {
			scoreMap["score=" + scores[s]] = s + 1;
		}

		episode.playerIds = [];
		episode.teamIds = [];
		episode.firstIds = [];
		episode.secondIds = [];
		episode.thirdIds = [];
		if (Array.isArray(episode.players)) {
			for (let p = 0; p < episode.players.length; p++) {
				let player = episode.players[p];
				episode.playerIds.push(player.id);
				peopleMap[player.id].appearances.push(episode.dropouttv_productid);
				seasonMap[episode.season_number].playerMap[player.id] = true;

				let place = scoreMap["score=" + player.score];
				switch (place) {
					case 1:
						episode.firstIds.push(player.id);
						peopleMap[player.id].times_first.push(episode.dropouttv_productid);
						seasonMap[episode.season_number].firstMap[player.id] = true;
						break;
					case 2:
						episode.secondIds.push(player.id);
						peopleMap[player.id].times_second.push(episode.dropouttv_productid);
						seasonMap[episode.season_number].secondMap[player.id] = true;
						break;
					case 3:
						episode.thirdIds.push(player.id);
						peopleMap[player.id].times_third.push(episode.dropouttv_productid);
						seasonMap[episode.season_number].thirdMap[player.id] = true;
						break;
				}

				peopleMap[player.id].high_score._sum += player.score;
				peopleMap[player.id].high_score._count++;

				if (peopleMap[player.id].high_score.minimum === null || player.score < peopleMap[player.id].high_score.minimum) {
					peopleMap[player.id].high_score.minimum = player.score;
				}
				if (peopleMap[player.id].high_score.maximum === null || player.score > peopleMap[player.id].high_score.maximum) {
					peopleMap[player.id].high_score.maximum = player.score;
				}

				episode.players[p].name = peopleMap[player.id].name;
				episode.players[p].place = place;
			}
		}
		if (Array.isArray(episode.teams)) {
			for (let t = 0; t < episode.teams.length; t++) {
				let team = episode.teams[t];
				episode.teamIds.push(team.id);
				teamMap[team.id].appearances.push(episode.dropouttv_productid);
				seasonMap[episode.season_number].teamMap[team.id] = true;

				let place = scoreMap["score=" + team.score];
				switch (place) {
					case 1:
						episode.firstIds.push(team.id);
						teamMap[team.id].times_first.push(episode.dropouttv_productid);
						seasonMap[episode.season_number].firstMap[team.id] = true;
						break;
					case 2:
						episode.secondIds.push(team.id);
						teamMap[team.id].times_second.push(episode.dropouttv_productid);
						seasonMap[episode.season_number].secondMap[team.id] = true;
						break;
					case 3:
						episode.thirdIds.push(team.id);
						peopleMap[team.id].times_third.push(episode.dropouttv_productid);
						seasonMap[episode.season_number].thirdMap[team.id] = true;
						break;
				}

				episode.teams[t].name = teamMap[team.id].name;
				episode.teams[t].place = place;
			}
		}

		episode.questionTopicMap = {};
		episode.questionTitleMap = {};
		if (Array.isArray(episode.questions)) {
			let firstAnswerMap = {};
			for (let playerId of episode.playerIds) {
				firstAnswerMap[playerId] = null;
			}

			for (let q = 0; q < episode.questions.length; q++) {
				let question = episode.questions[q];
				if (question.topic) {
					episode.questionTopicMap[question.topic] = true;
					if (!questionTopicMap[question.topic]) {
						console.warn("undefined topic:", question.topic);
					}
					if (!questionTopicMap[question.topic].episodes.includes(episode.dropouttv_productid)) {
						questionTopicMap[question.topic].episodes.push(episode.dropouttv_productid);
					}
					if (!seasonMap[episode.season_number].questionTopics.includes(question.topic)) {
						seasonMap[episode.season_number].questionTopics.push(question.topic);
					}
					for (let playerId of episode.playerIds) {
						if (!peopleMap[playerId].topics.includes(question.topic)) {
							peopleMap[playerId].topics.push(question.topic);
						}
						if (!questionTopicMap[question.topic].players.includes(playerId)) {
							questionTopicMap[question.topic].players.push(playerId);
						}
					}
					for (let teamId of episode.teamIds) {
						if (!teamMap[teamId].topics.includes(question.topic)) {
							teamMap[teamId].topics.push(question.topic);
						}
						if (!questionTopicMap[question.topic].teams.includes(teamId)) {
							questionTopicMap[question.topic].teams.push(teamId);
						}
					}
				}
				if (question.title) {
					episode.questionTitleMap[question.title] = true;
					if (!questionTitleMap[question.title]) {
						console.warn("undefined title:", question.title);
					}

					if (!questionTitleMap[question.title].episodes.includes(episode.dropouttv_productid)) {
						questionTitleMap[question.title].episodes.push(episode.dropouttv_productid);
					}
					if (!seasonMap[episode.season_number].questionTitles.includes(question.title)) {
						seasonMap[episode.season_number].questionTitles.push(question.title);
					}
					for (let playerId of episode.playerIds) {
						if (!peopleMap[playerId].titles.includes(question.title)) {
							peopleMap[playerId].titles.push(question.title);
						}
						if (!questionTitleMap[question.title].players.includes(playerId)) {
							questionTitleMap[question.title].players.push(playerId);
						}
					}
					for (let teamId of episode.teamIds) {
						if (!teamMap[teamId].titles.includes(question.title)) {
							teamMap[teamId].titles.push(question.title);
						}
						if (!questionTitleMap[question.title].teams.includes(teamId)) {
							questionTitleMap[question.title].teams.push(teamId);
						}
					}
				}
				for (let winnerId of question.winners) {
					if (typeof firstAnswerMap[winnerId] !== 'undefined' && firstAnswerMap[winnerId] === null) {
						firstAnswerMap[winnerId] = q + 1;
					}
				}
			}

			for (let playerId in firstAnswerMap) {
				if (firstAnswerMap[playerId]) {
					peopleMap[playerId].time_until_first_point._sum += firstAnswerMap[playerId];
					peopleMap[playerId].time_until_first_point._count++;

					if (peopleMap[playerId].time_until_first_point.minimum === null || firstAnswerMap[playerId] < peopleMap[playerId].time_until_first_point.minimum) {
						peopleMap[playerId].time_until_first_point.minimum = firstAnswerMap[playerId];
					}
					if (peopleMap[playerId].time_until_first_point.maximum === null || firstAnswerMap[playerId] > peopleMap[playerId].time_until_first_point.maximum) {
						peopleMap[playerId].time_until_first_point.maximum = firstAnswerMap[playerId];
					}
				}
			}
		}

		episode.questionTopics = [];
		for (let key in episode.questionTopicMap) {
			episode.questionTopics.push(key);
		}
		delete episode.questionTopicMap;

		episode.questionTitles = [];
		for (let key in episode.questionTitleMap) {
			episode.questionTitles.push(key);
		}
		delete episode.questionTitleMap;

		stats.episodes.push(episode);
	}

	for (let key in peopleMap) {
		let person = peopleMap[key];
		if (person.time_until_first_point._count > 0) {
			person.time_until_first_point.average = person.time_until_first_point._sum / person.time_until_first_point._count;
		}
		if (person.high_score._count > 0) {
			person.high_score.average = person.high_score._sum / person.high_score._count;
		}
	}
	for (let key in peopleMap) {
		stats.people.push(peopleMap[key]);
	}
	stats.people.sort((a, b) => a.name.localeCompare(b.name));

	for (let key in teamMap) {
		stats.teams.push(teamMap[key]);
	}
	console.log("stats.teams:", stats.teams);
	stats.teams.sort((a, b) => a.name.localeCompare(b.name));

	for (let key in seasonMap) {
		let season = seasonMap[key];

		season.hosts = [];
		for (let key in season.hostMap) {
			season.hosts.push(key);
		}
		delete season.hostMap;

		season.factCheckers = [];
		for (let key in season.factCheckerMap) {
			season.factCheckers.push(key);
		}
		delete season.factCheckerMap;

		season.players = [];
		for (let key in season.playerMap) {
			season.players.push(key);
		}
		delete season.playerMap;

		season.teams = [];
		for (let key in season.teamMap) {
			season.teams.push(key);
		}
		delete season.teamMap;

		season.firstIds = [];
		for (let key in season.firstMap) {
			season.firstIds.push(key);
		}
		delete season.firstMap;

		season.secondIds = [];
		for (let key in season.secondMap) {
			season.secondIds.push(key);
		}
		delete season.secondMap;

		season.thirdIds = [];
		for (let key in season.thirdMap) {
			season.thirdIds.push(key);
		}
		delete season.thirdMap;

		stats.seasons.push(seasonMap[key]);
	}

	for (key in questionTopicMap) {
		stats.questionTopics.push(questionTopicMap[key]);
	}
	stats.questionTopics.sort((a, b) => a.name.localeCompare(b.name));

	for (key in questionTitleMap) {
		stats.questionTitles.push(questionTitleMap[key]);
	}
	stats.questionTitles.sort((a, b) => a.name.localeCompare(b.name));

	return stats;
}

function renderCharts(stats) {
	renderChartRuntimes(document.getElementById('chart-runtimes').getContext('2d'));
	renderChartTotalPoints(document.getElementById('chart-points').getContext('2d'));
	renderChartPlayerWins(document.getElementById('chart-wins').getContext('2d'));
}

function renderChartRuntimes(ctx) {
	let items = [];

	stats.episodes.forEach(episode => {
		items.push({
			id: episode.dropouttv_productid,
			season_and_number: episode.season_and_number,
			durationInSeconds: episode.duration,
			durationInMinutes: episode.duration / 60,
		});
	});

	let xValues = [];
	let yValues = [];

	items.forEach(item => {
		xValues.push(item.season_and_number);
		yValues.push(item.durationInMinutes);
	});

	let chart = new Chart(ctx, {
		// The type of chart we want to create
		type: 'bar',
		// The data for our dataset
		data: {
			labels: xValues,
			datasets: [{
				label: 'Episode Runtimes',
				data: yValues,
				backgroundColor: 'rgba(0,0,0,0.3)',
				borderColor: 'rgba(0,0,0,0.4)',
				borderWidth: 1,
			}],
		},
		// Configuration options go here
		options: {
			animation: {
				duration: 0,
			},
			legend: {
				// TODO: This doesn't seem to work.
				onClick: function (e) {
					console.log("e:", e);
					console.log("arguments:", arguments);
				},
			},
			maintainAspectRatio: false,
			onClick: function (e) {
				//console.log("e:", e);
				const activePoints = chart.getElementsAtEventForMode(e, 'nearest', {
					intersect: true
				}, false);
				//console.log("activePoints:", activePoints);
				if (activePoints.length == 0) {
					return;
				}
				let index = activePoints[0]._index;
				let filter = { type: "episode", id: items[index].id, role: "*" };

				let newFilter = !hasFilter(filter);
				if (newFilter) {
					addFilter(filter);
				} else {
					removeFilter(filter);
				}
			},
			tooltips: {
				callbacks: {
					// Render the runtime as ""##m##s".
					label: function (tooltipItem, data) {
						let v = items[tooltipItem.index].durationInSeconds;

						let minutes = parseInt(v / 60);
						let seconds = v % 60;

						let minutesString = "" + minutes;
						if (minutesString.length < 2) {
							minutesString = "0" + minutesString;
						}
						let secondsString = "" + seconds;
						if (secondsString.length < 2) {
							secondsString = "0" + secondsString;
						}

						return minutesString + "m" + secondsString + "s";
					},
				}
			},
		},
	});
}

function renderChartTotalPoints(ctx) {
	let items = [];

	stats.episodes.forEach(episode => {
		let playerPoints = 0;
		if (Array.isArray(episode.players)) {
			playerPoints = episode.players.reduce((accumulator, player) => accumulator + player.score, 0);
		}
		let teamPoints = 0;
		if (Array.isArray(episode.teams)) {
			teamPoints = episode.teams.reduce((accumulator, team) => accumulator + team.score, 0);
		}

		items.push({
			id: episode.dropouttv_productid,
			season_and_number: episode.season_and_number,
			points: playerPoints + teamPoints,
		});
	});

	let xValues = [];
	let yValues = [];
	items.forEach(item => {
		xValues.push(item.season_and_number);
		yValues.push(item.points);
	});

	let chart = new Chart(ctx, {
		// The type of chart we want to create
		type: 'bar',
		// The data for our dataset
		data: {
			labels: xValues,
			datasets: [{
				label: 'Episode Point Totals',
				data: yValues,
				backgroundColor: 'rgba(0,0,0,0.3)',
				borderColor: 'rgba(0,0,0,0.4)',
				borderWidth: 1,
			}],
		},
		// Configuration options go here
		options: {
			animation: {
				duration: 0,
			},
			legend: {
				// TODO: This doesn't seem to work.
				onClick: function (e) {
					console.log("e:", e);
					console.log("arguments:", arguments);
				},
			},
			maintainAspectRatio: false,
			onClick: function (e) {
				//console.log("e:", e);
				const activePoints = chart.getElementsAtEventForMode(e, 'nearest', {
					intersect: true
				}, false);
				//console.log("activePoints:", activePoints);
				if (activePoints.length == 0) {
					return;
				}
				let index = activePoints[0]._index;
				let filter = { type: "episode", id: items[index].id, role: "*" };

				let newFilter = !hasFilter(filter);
				if (newFilter) {
					addFilter(filter);
				} else {
					removeFilter(filter);
				}
			},
		},
	});
}

function renderChartPlayerWins(ctx) {
	let items = [];

	stats.people.forEach(person => {
		let playerWins = 0;
		if (Array.isArray(person.times_first)) {
			playerWins = person.times_first.length;
		}

		items.push({
			id: person.id,
			name: person.name,
			wins: playerWins
		});
	});

	items.sort((left, right) => {
		let difference = left.wins - right.wins;
		if (difference < 0) {
			return 1;
		} else if (difference > 0) {
			return -1;
		}
		return left.name.localeCompare(right.name);
	});

	if (items.length > 10) {
		items = items.slice(0, 10);
	}

	let xValues = [];
	let yValues = [];
	items.forEach(point => {
		xValues.push(point.name);
		yValues.push(point.wins)
	})

	let chart = new Chart(ctx, {
		// The type of chart we want to create
		type: 'horizontalBar',
		// The data for our dataset
		data: {
			labels: xValues,
			datasets: [{
				label: 'Player Wins',
				data: yValues,
				backgroundColor: 'rgba(0,0,0,0.3)',
				borderColor: 'rgba(0,0,0,0.4)',
				borderWidth: 1,
			}],
		},
		// Configuration options go here
		options: {
			animation: {
				duration: 0,
			},
			legend: {
				// TODO: This doesn't seem to work.
				onClick: function (e) {
					console.log("e:", e);
					console.log("arguments:", arguments);
				},
			},
			maintainAspectRatio: false,
			onClick: function (e) {
				//console.log("e:", e);
				const activePoints = chart.getElementsAtEventForMode(e, 'nearest', {
					intersect: true
				}, false);
				//console.log("activePoints:", activePoints);
				if (activePoints.length == 0) {
					return;
				}
				let index = activePoints[0]._index;
				let filter = { type: "person", id: items[index].id, role: "player" };

				let newFilter = !hasFilter(filter);
				if (newFilter) {
					addFilter(filter);
				} else {
					removeFilter(filter);
				}
			},
			scales: {
				xAxes: [
					{
						display: true,
						ticks: {
							min: 0,
						},
					},
				],
			},
		},
	});
}