// ScoreSaber exporter: player snapshot, scores (score + leaderboard items), replays.
// Public API, no auth. Replays are paced at ~10.5 s (360/hour limit) and run as their own command.
import * as fs from 'node:fs';
import * as path from 'node:path';
import { SS_SCRAPER_REPLAYS } from './config.ts';
import { get, limiters } from './http.ts';
import { archivePath, eachWithProgress, exists, listFiles, readJson, save, saveSnapshotIfChanged, updateState } from './store.ts';

const SS_API = 'https://scoresaber.com/api';
const ss = (playerId: string, ...p: string[]) => archivePath('scoresaber', playerId, ...p);

export type SSItem = {
	score: { id: number; timeSet: string; hasReplay: boolean };
	leaderboard: { songHash: string };
};

export function archivedSSScores(playerId: string, sinceUnix = 0): SSItem[] {
	const dir = ss(playerId, 'scores');
	return listFiles(dir, '.json')
		.map((f) => readJson<SSItem>(path.join(dir, f)))
		.filter((it) => Date.parse(it.score.timeSet) / 1000 >= sinceUnix);
}

export async function exportSSPlayer(playerId: string): Promise<void> {
	const r = await get(`${SS_API}/player/${playerId}/full`, { limiter: limiters.scoresaber });
	console.log(`ScoreSaber player ${playerId}: ${saveSnapshotIfChanged(ss(playerId, 'player'), r.body) ? 'saved' : 'unchanged'}`);
}

/** Page `sort=recent` until scores are older than `sinceUnix`. Returns the new items. */
export async function exportSSScores(playerId: string, sinceUnix: number): Promise<SSItem[]> {
	console.log(`ScoreSaber scores for ${playerId} since ${new Date(sinceUnix * 1000).toISOString()}`);
	const added: SSItem[] = [];
	let seen = 0;
	for (let page = 1; ; page++) {
		const r = await get(`${SS_API}/player/${playerId}/scores?limit=100&page=${page}&sort=recent`, { limiter: limiters.scoresaber });
		const json = JSON.parse(r.body.toString('utf-8')) as { playerScores: SSItem[]; metadata: { total: number } };
		let reachedCutoff = false;
		for (const item of json.playerScores) {
			if (Date.parse(item.score.timeSet) / 1000 < sinceUnix) {
				reachedCutoff = true;
				break;
			}
			seen++;
			const file = ss(playerId, 'scores', `${item.score.id}.json`);
			if (exists(file)) continue;
			save(file, JSON.stringify(item));
			added.push(item);
		}
		console.log(`  page ${page}: ${seen} in window, ${added.length} new (total on server ${json.metadata.total})`);
		if (reachedCutoff || json.playerScores.length < 100) break;
	}
	updateState(`scoresaber:${playerId}`, { scoresSince: sinceUnix, lastScoresRun: new Date().toISOString() });
	return added;
}

/** Newest archived ScoreSaber score time for a player (unix seconds), 0 when there is none. */
export function newestSSScoreTime(playerId: string): number {
	return archivedSSScores(playerId).reduce((max, it) => Math.max(max, Math.floor(Date.parse(it.score.timeSet) / 1000)), 0);
}

/** Download replays for archived scores with hasReplay, oldest first, ~10.5 s apart. */
export async function exportSSReplays(playerId: string, sinceUnix: number): Promise<void> {
	const items = archivedSSScores(playerId, sinceUnix)
		.filter((it) => it.score.hasReplay)
		.sort((a, b) => Date.parse(a.score.timeSet) - Date.parse(b.score.timeSet));
	seedFromScraper(playerId, items);
	const todo = items.filter((it) => !exists(ss(playerId, 'replays', `${it.score.id}.dat`)));
	console.log(`ScoreSaber replays for ${playerId}: ${items.length} with hasReplay, ${todo.length} to download (~${Math.ceil((todo.length * 10.5) / 60)} min)`);
	const res = await eachWithProgress(
		'ss-replays',
		todo,
		async (it) => {
			const r = await get(`${SS_API}/v2/scores/${it.score.id}/replay`, {
				limiter: limiters.scoresaberReplay,
				accept: [404],
				timeoutMs: 300_000
			});
			if (r.status === 404) return 'missing';
			save(ss(playerId, 'replays', `${it.score.id}.dat`), r.body);
			return 'done';
		},
		10
	);
	if (res.missing || res.failed.length) {
		updateState('failures', { [`scoresaber:${playerId}:replays`]: res.failed.map((f) => f.item.score.id) });
	}
}

/** Copy replays ss-scraper already downloaded (<scoreId>_<name>.dat) instead of fetching them again. */
function seedFromScraper(playerId: string, items: SSItem[]): void {
	const dir = path.join(SS_SCRAPER_REPLAYS, playerId);
	const byId = new Map<string, string>();
	for (const f of listFiles(dir, '.dat')) byId.set(f.split('_')[0], f);
	let copied = 0;
	for (const it of items) {
		const src = byId.get(String(it.score.id));
		const dest = ss(playerId, 'replays', `${it.score.id}.dat`);
		if (!src || exists(dest)) continue;
		save(dest, fs.readFileSync(path.join(dir, src)));
		copied++;
	}
	if (copied) console.log(`  copied ${copied} replays from ${dir}`);
}

/**
 * The map hash BeatLeader and the archive use for a ScoreSaber item: lowercase, and for official
 * levels the level id without ScoreSaber's "ost_" prefix (BeatLeader: "beatsaber", SS: "ost_BeatSaber").
 */
export function ssMapHash(it: SSItem): string {
	return it.leaderboard.songHash.toLowerCase().replace(/^ost_/, '');
}

export function ssHashes(playerId: string, sinceUnix = 0): string[] {
	return [...new Set(archivedSSScores(playerId, sinceUnix).map(ssMapHash))].sort();
}