import type { LoaderFunctionArgs, MetaFunction } from "react-router";
import { useLoaderData } from "react-router";
import { ensureUserLoggedIn } from "../.server/auth";
import { createApiClient } from "../api/client";
import type { components } from "../api/schema";
import BorderedContainer from "../components/BorderedContainer";
import UserIcon from "../components/UserIcon";

export const meta: MetaFunction = () => [
	{ title: "Tournament | iOSDC Japan 2025 Albatross" },
];

export async function loader({ request }: LoaderFunctionArgs) {
	const { token } = await ensureUserLoggedIn(request);
	const apiClient = createApiClient(token);

	const url = new URL(request.url);
	const game1Param = url.searchParams.get("game1");
	const game2Param = url.searchParams.get("game2");
	const game3Param = url.searchParams.get("game3");
	const game4Param = url.searchParams.get("game4");
	const game5Param = url.searchParams.get("game5");
	const player1Param = url.searchParams.get("player1");
	const player2Param = url.searchParams.get("player2");
	const player3Param = url.searchParams.get("player3");
	const player4Param = url.searchParams.get("player4");
	const player5Param = url.searchParams.get("player5");
	const player6Param = url.searchParams.get("player6");

	if (!game1Param || !game2Param || !game3Param || !game4Param || !game5Param) {
		throw new Response(
			"Missing required query parameters: game1, game2, game3, game4, game5",
			{
				status: 400,
			},
		);
	}
	if (
		!player1Param ||
		!player2Param ||
		!player3Param ||
		!player4Param ||
		!player5Param ||
		!player6Param
	) {
		throw new Response(
			"Missing required query parameters: player1, player2, player3, player4, player5, player6",
			{
				status: 400,
			},
		);
	}

	const game1 = Number(game1Param);
	const game2 = Number(game2Param);
	const game3 = Number(game3Param);
	const game4 = Number(game4Param);
	const game5 = Number(game5Param);

	if (!game1 || !game2 || !game3 || !game4 || !game5) {
		throw new Response("Invalid game IDs: must be positive integers", {
			status: 400,
		});
	}

	const { tournament } = await apiClient.getTournament(
		game1,
		game2,
		game3,
		game4,
		game5,
	);
	return {
		tournament,
		playerIDs: [
			Number(player1Param),
			Number(player2Param),
			Number(player3Param),
			Number(player4Param),
			Number(player5Param),
			Number(player6Param),
		],
	};
}

type TournamentMatch = components["schemas"]["TournamentMatch"];
type User = components["schemas"]["User"];

function Player({ player, rank }: { player: User | null; rank: number }) {
	return (
		<BorderedContainer>
			<div className="flex flex-col items-center gap-2">
				<span className="text-gray-800 text-md">予選 {rank} 位</span>
				<span className="font-medium text-lg">{player?.display_name}</span>
				{player?.icon_path && (
					<UserIcon
						iconPath={player.icon_path}
						displayName={player.display_name}
						className="w-16 h-16 my-auto"
					/>
				)}
			</div>
		</BorderedContainer>
	);
}

function BranchVL({ className = "" }: { className?: string }) {
	return (
		<div className="grid grid-cols-2">
			<div></div>
			<div className={`border-l-4 ${className}`}></div>
		</div>
	);
}

function BranchVR({ className = "" }: { className?: string }) {
	return (
		<div className="grid grid-cols-2">
			<div className={`border-r-4 ${className}`}></div>
			<div></div>
		</div>
	);
}

function BranchVL2({
	score,
	className = "",
}: { score: number | null; className?: string }) {
	return (
		<div className="grid grid-cols-3">
			<div className={`border-r-4 ${className}`}></div>
			<div className={`border-t-4 p-2 font-bold text-xl ${className}`}>
				{score}
			</div>
			<div className={`border-t-4 ${className}`}></div>
		</div>
	);
}

function BranchVR2({
	score,
	className = "",
}: { score: number | null; className?: string }) {
	return (
		<div className="grid grid-cols-3">
			<div className={`border-t-4 ${className}`}></div>
			<div className={`border-t-4 p-2 font-bold text-xl ${className}`}>
				{score}
			</div>
			<div className={`border-l-4 ${className}`}></div>
		</div>
	);
}

function BranchV3({ className = "" }: { className?: string }) {
	return <div className={`border-r-4 ${className}`}></div>;
}

function BranchH({
	score,
	className1,
	className2,
	className3,
}: {
	score?: number | null;
	className1: string;
	className2: string;
	className3: string;
}) {
	return (
		<div className="grid grid-cols-3">
			<div className={`border-t-4 ${className1}`}></div>
			<div className={`border-t-4 ${className2}`}></div>
			<div className={`border-t-4 p-2 font-bold text-xl ${className3}`}>
				{score}
			</div>
		</div>
	);
}

function BranchH2({
	score,
	className1,
	className2,
	className3,
}: {
	score?: number | null;
	className1: string;
	className2: string;
	className3: string;
}) {
	return (
		<div className="grid grid-cols-3">
			<div
				className={`border-t-4 p-2 font-bold text-xl text-right ${className1}`}
			>
				{score}
			</div>
			<div className={`border-t-4 ${className2}`}></div>
			<div className={`border-t-4 ${className3}`}></div>
		</div>
	);
}

function BranchL({
	score,
	className = "",
}: { score: number | null; className?: string }) {
	return (
		<div className="grid grid-cols-2">
			<div></div>
			<div
				className={`border-l-4 border-t-4 p-2 font-bold text-xl ${className}`}
			>
				{score}
			</div>
		</div>
	);
}

function BranchR({
	score,
	className = "",
}: { score: number | null; className?: string }) {
	return (
		<div className="grid grid-cols-2">
			<div
				className={`border-r-4 border-t-4 p-2 font-bold text-xl text-right ${className}`}
			>
				{score}
			</div>
			<div></div>
		</div>
	);
}

function BranchL2({ className = "" }: { className?: string }) {
	return (
		<div className="grid grid-cols-2">
			<div className={`border-l-4 ${className}`}></div>
			<div></div>
		</div>
	);
}

function BranchR2({ className = "" }: { className?: string }) {
	return (
		<div className="grid grid-cols-2">
			<div></div>
			<div className={`border-r-4 ${className}`}></div>
		</div>
	);
}

function getPlayer(match: TournamentMatch, playerID: number): User | null {
	if (match.player1?.user_id === playerID) return match.player1;
	else if (match.player2?.user_id === playerID) return match.player2;
	else return null;
}

function getScore(match: TournamentMatch, playerIDs: number[]): number | null {
	if (match.player1 && playerIDs.includes(match.player1.user_id))
		return match.player1_score ?? null;
	if (match.player2 && playerIDs.includes(match.player2.user_id))
		return match.player2_score ?? null;
	else return null;
}

function getBorderColor(match: TournamentMatch, playerIDs: number[]): string {
	if (!match.winner) {
		return "border-black";
	} else if (playerIDs.includes(match.winner)) {
		return "border-pink-700";
	} else {
		return "border-gray-400";
	}
}

export default function Tournament() {
	const { tournament, playerIDs } = useLoaderData<typeof loader>();

	const match1 = tournament.matches[0]!;
	const match2 = tournament.matches[1]!;
	const match3 = tournament.matches[2]!;
	const match4 = tournament.matches[3]!;
	const match5 = tournament.matches[4]!;

	const playerID1 = playerIDs[0]!;
	const playerID2 = playerIDs[1]!;
	const playerID3 = playerIDs[2]!;
	const playerID4 = playerIDs[3]!;
	const playerID5 = playerIDs[4]!;
	const playerID6 = playerIDs[5]!;

	const player5 = getPlayer(match1, playerID5);
	const player4 = getPlayer(match1, playerID4);
	const player3 = getPlayer(match2, playerID3);
	const player6 = getPlayer(match2, playerID6);
	const player1 = getPlayer(match3, playerID1);
	const player2 = getPlayer(match4, playerID2);

	return (
		<div className="p-6 bg-gray-100 min-h-screen">
			<div className="max-w-5xl mx-auto">
				<h1 className="text-3xl font-bold text-transparent bg-clip-text bg-iosdc-japan text-center mb-8">
					iOSDC Japan 2025 Swift Code Battle
				</h1>

				<div className="grid grid-rows-5">
					<div className="grid grid-cols-6">
						<div></div>
						<div></div>
						<BranchV3
							className={getBorderColor(match5, [
								playerID1,
								playerID5,
								playerID4,
								playerID3,
								playerID6,
								playerID2,
							])}
						/>
						<div></div>
						<div></div>
						<div></div>
					</div>
					<div className="grid grid-cols-6">
						<div></div>
						<BranchVL2
							score={getScore(match5, [playerID1, playerID5, playerID4])}
							className={getBorderColor(match5, [
								playerID1,
								playerID5,
								playerID4,
							])}
						/>
						<BranchH
							className1={getBorderColor(match5, [
								playerID1,
								playerID5,
								playerID4,
							])}
							className2={getBorderColor(match5, [
								playerID1,
								playerID5,
								playerID4,
							])}
							className3={getBorderColor(match5, [
								playerID1,
								playerID5,
								playerID4,
							])}
						/>
						<BranchH
							className1={getBorderColor(match5, [
								playerID3,
								playerID6,
								playerID2,
							])}
							className2={getBorderColor(match5, [
								playerID3,
								playerID6,
								playerID2,
							])}
							className3={getBorderColor(match5, [
								playerID3,
								playerID6,
								playerID2,
							])}
						/>
						<BranchVR2
							score={getScore(match5, [playerID3, playerID6, playerID2])}
							className={getBorderColor(match5, [
								playerID3,
								playerID6,
								playerID2,
							])}
						/>
						<div></div>
					</div>
					<div className="grid grid-cols-6">
						<BranchL
							score={getScore(match3, [playerID1])}
							className={getBorderColor(match3, [playerID1])}
						/>
						<BranchH
							score={getScore(match3, [playerID5, playerID4])}
							className1={getBorderColor(match3, [playerID1])}
							className2={getBorderColor(match3, [playerID5, playerID4])}
							className3={getBorderColor(match3, [playerID5, playerID4])}
						/>
						<BranchL2
							className={getBorderColor(match3, [playerID5, playerID4])}
						/>
						<BranchR2
							className={getBorderColor(match4, [playerID3, playerID6])}
						/>
						<BranchH2
							score={getScore(match4, [playerID3, playerID6])}
							className1={getBorderColor(match4, [playerID3, playerID6])}
							className2={getBorderColor(match4, [playerID3, playerID6])}
							className3={getBorderColor(match4, [playerID2])}
						/>
						<BranchR
							score={getScore(match4, [playerID2])}
							className={getBorderColor(match4, [playerID2])}
						/>
					</div>
					<div className="grid grid-cols-6">
						<BranchVL className={getBorderColor(match3, [playerID1])} />
						<BranchL
							score={getScore(match1, [playerID5])}
							className={getBorderColor(match1, [playerID5])}
						/>
						<BranchR
							score={getScore(match1, [playerID4])}
							className={getBorderColor(match1, [playerID4])}
						/>
						<BranchL
							score={getScore(match2, [playerID3])}
							className={getBorderColor(match2, [playerID3])}
						/>
						<BranchR
							score={getScore(match2, [playerID6])}
							className={getBorderColor(match2, [playerID6])}
						/>
						<BranchVR className={getBorderColor(match4, [playerID2])} />
					</div>
					<div className="grid grid-cols-6 gap-6">
						<Player player={player1} rank={1} />
						<Player player={player5} rank={5} />
						<Player player={player4} rank={4} />
						<Player player={player3} rank={3} />
						<Player player={player6} rank={6} />
						<Player player={player2} rank={2} />
					</div>
				</div>
			</div>
		</div>
	);
}