netfelix-audio-fix/server/api/scan.ts

import { Hono } from "hono";
import { stream } from "hono/streaming";
import { getAllConfig, getConfig, getDb, setConfig } from "../db/index";
import { log, error as logError, warn } from "../lib/log";
import { analyzeItem } from "../services/analyzer";
import { extractOriginalLanguage, getAllItems, getDevItems, mapStream, normalizeLanguage } from "../services/jellyfin";
import { getOriginalLanguage as radarrLang } from "../services/radarr";
import { getOriginalLanguage as sonarrLang } from "../services/sonarr";
import type { MediaStream } from "../types";

const app = new Hono();

// ─── State ────────────────────────────────────────────────────────────────────

let scanAbort: AbortController | null = null;
const scanListeners = new Set<(data: string) => void>();

function emitSse(type: string, data: unknown): void {
	const line = `event: ${type}\ndata: ${JSON.stringify(data)}\n\n`;
	for (const listener of scanListeners) listener(line);
}

function currentScanLimit(): number | null {
	const v = getConfig("scan_limit");
	return v ? Number(v) : null;
}

// ─── Status ───────────────────────────────────────────────────────────────────

app.get("/", (c) => {
	const db = getDb();
	const running = getConfig("scan_running") === "1";
	const total = (db.prepare("SELECT COUNT(*) as n FROM media_items").get() as { n: number }).n;
	const scanned = (
		db.prepare("SELECT COUNT(*) as n FROM media_items WHERE scan_status = 'scanned'").get() as { n: number }
	).n;
	const errors = (db.prepare("SELECT COUNT(*) as n FROM media_items WHERE scan_status = 'error'").get() as { n: number })
		.n;
	const recentItems = db
		.prepare("SELECT name, type, scan_status, file_path FROM media_items ORDER BY last_scanned_at DESC LIMIT 50")
		.all() as { name: string; type: string; scan_status: string; file_path: string }[];

	return c.json({ running, progress: { scanned, total, errors }, recentItems, scanLimit: currentScanLimit() });
});

// ─── Start ────────────────────────────────────────────────────────────────────

app.post("/start", async (c) => {
	const db = getDb();
	// Atomic claim: only succeed if scan_running is not already '1'.
	const claim = db.prepare("UPDATE config SET value = '1' WHERE key = 'scan_running' AND value != '1'").run();
	if (claim.changes === 0) {
		return c.json({ ok: false, error: "Scan already running" }, 409);
	}

	const body = await c.req.json<{ limit?: number }>().catch(() => ({ limit: undefined }));
	const formLimit = body.limit ?? null;
	const envLimit = process.env.SCAN_LIMIT ? Number(process.env.SCAN_LIMIT) : null;
	const limit = formLimit ?? envLimit ?? null;
	setConfig("scan_limit", limit != null ? String(limit) : "");

	runScan(limit).catch((err) => {
		logError("Scan failed:", err);
		setConfig("scan_running", "0");
		emitSse("error", { message: String(err) });
	});

	return c.json({ ok: true });
});

// ─── Stop ─────────────────────────────────────────────────────────────────────

app.post("/stop", (c) => {
	scanAbort?.abort();
	setConfig("scan_running", "0");
	return c.json({ ok: true });
});

// ─── SSE ──────────────────────────────────────────────────────────────────────

app.get("/events", (c) => {
	return stream(c, async (s) => {
		c.header("Content-Type", "text/event-stream");
		c.header("Cache-Control", "no-cache");
		c.header("Connection", "keep-alive");

		const queue: string[] = [];
		let resolve: (() => void) | null = null;

		const listener = (data: string) => {
			queue.push(data);
			resolve?.();
		};

		scanListeners.add(listener);
		s.onAbort(() => {
			scanListeners.delete(listener);
		});

		try {
			while (!s.closed) {
				if (queue.length > 0) {
					await s.write(queue.shift()!);
				} else {
					await new Promise<void>((res) => {
						resolve = res;
						setTimeout(res, 25_000);
					});
					resolve = null;
					if (queue.length === 0) await s.write(": keepalive\n\n");
				}
			}
		} finally {
			scanListeners.delete(listener);
		}
	});
});

// ─── Core scan logic ──────────────────────────────────────────────────────────

async function runScan(limit: number | null = null): Promise<void> {
	log(`Scan started${limit ? ` (limit: ${limit})` : ""}`);
	scanAbort = new AbortController();
	const { signal } = scanAbort;
	const isDev = process.env.NODE_ENV === "development";
	const db = getDb();

	if (isDev) {
		// Order matters only if foreign keys are enforced without CASCADE; we
		// have ON DELETE CASCADE on media_streams/review_plans/stream_decisions/
		// subtitle_files/jobs, so deleting media_items would be enough. List
		// them explicitly for clarity and to survive future schema drift.
		db.prepare("DELETE FROM jobs").run();
		db.prepare("DELETE FROM subtitle_files").run();
		db.prepare("DELETE FROM stream_decisions").run();
		db.prepare("DELETE FROM review_plans").run();
		db.prepare("DELETE FROM media_streams").run();
		db.prepare("DELETE FROM media_items").run();
	}

	const cfg = getAllConfig();
	const jellyfinCfg = { url: cfg.jellyfin_url, apiKey: cfg.jellyfin_api_key, userId: cfg.jellyfin_user_id };
	const subtitleLanguages: string[] = JSON.parse(cfg.subtitle_languages ?? '["eng","deu","spa"]');
	const audioLanguages: string[] = JSON.parse(cfg.audio_languages ?? "[]");
	const radarrEnabled = cfg.radarr_enabled === "1";
	const sonarrEnabled = cfg.sonarr_enabled === "1";

	let processed = 0;
	let errors = 0;
	let total = 0;

	const upsertItem = db.prepare(`
		INSERT INTO media_items (
			jellyfin_id, type, name, series_name, series_jellyfin_id,
			season_number, episode_number, year, file_path, file_size, container,
			original_language, orig_lang_source, needs_review,
			imdb_id, tmdb_id, tvdb_id,
			scan_status, last_scanned_at
		) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 'scanned', datetime('now'))
		ON CONFLICT(jellyfin_id) DO UPDATE SET
			type = excluded.type, name = excluded.name, series_name = excluded.series_name,
			series_jellyfin_id = excluded.series_jellyfin_id, season_number = excluded.season_number,
			episode_number = excluded.episode_number, year = excluded.year, file_path = excluded.file_path,
			file_size = excluded.file_size, container = excluded.container,
			original_language = excluded.original_language, orig_lang_source = excluded.orig_lang_source,
			needs_review = excluded.needs_review, imdb_id = excluded.imdb_id,
			tmdb_id = excluded.tmdb_id, tvdb_id = excluded.tvdb_id,
			scan_status = 'scanned', last_scanned_at = datetime('now')
	`);

	const deleteStreams = db.prepare("DELETE FROM media_streams WHERE item_id = ?");
	const insertStream = db.prepare(`
		INSERT INTO media_streams (
			item_id, stream_index, type, codec, language, language_display,
			title, is_default, is_forced, is_hearing_impaired,
			channels, channel_layout, bit_rate, sample_rate
		) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
	`);
	const upsertPlan = db.prepare(`
		INSERT INTO review_plans (item_id, status, is_noop, confidence, apple_compat, job_type, notes)
		VALUES (?, 'pending', ?, ?, ?, ?, ?)
		ON CONFLICT(item_id) DO UPDATE SET
			status = CASE WHEN review_plans.status IN ('done','error') THEN 'pending' ELSE review_plans.status END,
			is_noop = excluded.is_noop,
			confidence = excluded.confidence,
			apple_compat = excluded.apple_compat,
			job_type = excluded.job_type,
			notes = excluded.notes
	`);
	const upsertDecision = db.prepare(`
		INSERT INTO stream_decisions (plan_id, stream_id, action, target_index, transcode_codec)
		VALUES (?, ?, ?, ?, ?)
		ON CONFLICT(plan_id, stream_id) DO UPDATE SET action = excluded.action, target_index = excluded.target_index, transcode_codec = excluded.transcode_codec
	`);
	const getItemByJellyfinId = db.prepare("SELECT id FROM media_items WHERE jellyfin_id = ?");
	const getPlanByItemId = db.prepare("SELECT id FROM review_plans WHERE item_id = ?");
	const getStreamsByItemId = db.prepare("SELECT * FROM media_streams WHERE item_id = ?");

	const itemSource = isDev
		? getDevItems(jellyfinCfg)
		: getAllItems(jellyfinCfg, (_fetched, jellyfinTotal) => {
				total = limit != null ? Math.min(limit, jellyfinTotal) : jellyfinTotal;
			});
	for await (const jellyfinItem of itemSource) {
		if (signal.aborted) break;
		if (!isDev && limit != null && processed >= limit) break;
		if (!jellyfinItem.Name || !jellyfinItem.Path) {
			warn(`Skipping item without name/path: id=${jellyfinItem.Id}`);
			continue;
		}

		processed++;
		emitSse("progress", { scanned: processed, total, current_item: jellyfinItem.Name, errors, running: true });

		try {
			const providerIds = jellyfinItem.ProviderIds ?? {};
			const imdbId = providerIds.Imdb ?? null;
			const tmdbId = providerIds.Tmdb ?? null;
			const tvdbId = providerIds.Tvdb ?? null;

			let origLang: string | null = extractOriginalLanguage(jellyfinItem);
			let origLangSource = "jellyfin";
			let needsReview = origLang ? 0 : 1;

			if (jellyfinItem.Type === "Movie" && radarrEnabled && (tmdbId || imdbId)) {
				const lang = await radarrLang(
					{ url: cfg.radarr_url, apiKey: cfg.radarr_api_key },
					{ tmdbId: tmdbId ?? undefined, imdbId: imdbId ?? undefined },
				);
				if (lang) {
					if (origLang && normalizeLanguage(origLang) !== normalizeLanguage(lang)) needsReview = 1;
					origLang = lang;
					origLangSource = "radarr";
				}
			}

			if (jellyfinItem.Type === "Episode" && sonarrEnabled && tvdbId) {
				const lang = await sonarrLang({ url: cfg.sonarr_url, apiKey: cfg.sonarr_api_key }, tvdbId);
				if (lang) {
					if (origLang && normalizeLanguage(origLang) !== normalizeLanguage(lang)) needsReview = 1;
					origLang = lang;
					origLangSource = "sonarr";
				}
			}

			// Compute confidence from source agreement
			let confidence: "high" | "low" = "low";
			if (!origLang) {
				confidence = "low"; // unknown language
			} else if (needsReview) {
				confidence = "low"; // sources disagree
			} else {
				confidence = "high"; // language known, no conflicts
			}

			upsertItem.run(
				jellyfinItem.Id,
				jellyfinItem.Type === "Episode" ? "Episode" : "Movie",
				jellyfinItem.Name,
				jellyfinItem.SeriesName ?? null,
				jellyfinItem.SeriesId ?? null,
				jellyfinItem.ParentIndexNumber ?? null,
				jellyfinItem.IndexNumber ?? null,
				jellyfinItem.ProductionYear ?? null,
				jellyfinItem.Path,
				jellyfinItem.Size ?? null,
				jellyfinItem.Container ?? null,
				origLang,
				origLangSource,
				needsReview,
				imdbId,
				tmdbId,
				tvdbId,
			);

			const itemRow = getItemByJellyfinId.get(jellyfinItem.Id) as { id: number };
			const itemId = itemRow.id;

			deleteStreams.run(itemId);
			for (const jStream of jellyfinItem.MediaStreams ?? []) {
				if (jStream.IsExternal) continue; // skip external subs — not embedded in container
				const s = mapStream(jStream);
				insertStream.run(
					itemId,
					s.stream_index,
					s.type,
					s.codec,
					s.language,
					s.language_display,
					s.title,
					s.is_default,
					s.is_forced,
					s.is_hearing_impaired,
					s.channels,
					s.channel_layout,
					s.bit_rate,
					s.sample_rate,
				);
			}

			const streams = getStreamsByItemId.all(itemId) as MediaStream[];
			const analysis = analyzeItem(
				{ original_language: origLang, needs_review: needsReview, container: jellyfinItem.Container ?? null },
				streams,
				{ subtitleLanguages, audioLanguages },
			);
			// Override base confidence with scan-computed value
			const finalConfidence = confidence;
			upsertPlan.run(
				itemId,
				analysis.is_noop ? 1 : 0,
				finalConfidence,
				analysis.apple_compat,
				analysis.job_type,
				analysis.notes.length > 0 ? analysis.notes.join("\n") : null,
			);
			const planRow = getPlanByItemId.get(itemId) as { id: number };
			for (const dec of analysis.decisions)
				upsertDecision.run(planRow.id, dec.stream_id, dec.action, dec.target_index, dec.transcode_codec);

			emitSse("log", { name: jellyfinItem.Name, type: jellyfinItem.Type, status: "scanned", file: jellyfinItem.Path });
		} catch (err) {
			errors++;
			logError(`Error scanning ${jellyfinItem.Name}:`, err);
			try {
				db
					.prepare("UPDATE media_items SET scan_status = 'error', scan_error = ? WHERE jellyfin_id = ?")
					.run(String(err), jellyfinItem.Id);
			} catch {
				/* ignore */
			}
			emitSse("log", { name: jellyfinItem.Name, type: jellyfinItem.Type, status: "error", file: jellyfinItem.Path });
		}
	}

	setConfig("scan_running", "0");
	log(`Scan complete: ${processed} scanned, ${errors} errors`);
	emitSse("complete", { scanned: processed, total, errors });
}

export default app;