import { Hono } from "hono";
import { getAllConfig, getConfig, getDb } from "../db/index";
import { isOneOf, parseId } from "../lib/validate";
import { analyzeItem, assignTargetOrder } from "../services/analyzer";
import { buildCommand } from "../services/ffmpeg";
import { getItem, mapStream, normalizeLanguage, refreshItem } from "../services/jellyfin";
import type { Job, MediaItem, MediaStream, ReviewPlan, StreamDecision } from "../types";

const app = new Hono();

// ─── Helpers ──────────────────────────────────────────────────────────────────

function getAudioLanguages(): string[] {
	return parseLanguageList(getConfig("audio_languages"), []);
}

function parseLanguageList(raw: string | null, fallback: string[]): string[] {
	if (!raw) return fallback;
	try {
		const parsed = JSON.parse(raw);
		return Array.isArray(parsed) ? parsed.filter((v): v is string => typeof v === "string") : fallback;
	} catch {
		return fallback;
	}
}

/**
 * Insert a pending audio job for the given item only if no pending job
 * already exists for it. Guards against duplicate jobs from rapid-fire
 * approve clicks, overlapping individual + bulk approvals, or any other
 * path that could race two POSTs for the same item. Returns true if a
 * job was actually inserted.
 */
export function enqueueAudioJob(db: ReturnType<typeof getDb>, itemId: number, command: string): boolean {
	const result = db
		.prepare(`
			INSERT INTO jobs (item_id, command, job_type, status)
			SELECT ?, ?, 'audio', 'pending'
			WHERE NOT EXISTS (SELECT 1 FROM jobs WHERE item_id = ? AND status = 'pending')
		`)
		.run(itemId, command, itemId);
	return result.changes > 0;
}

function countsByFilter(db: ReturnType<typeof getDb>): Record<string, number> {
	const total = (db.prepare("SELECT COUNT(*) as n FROM review_plans").get() as { n: number }).n;
	const noops = (db.prepare("SELECT COUNT(*) as n FROM review_plans WHERE is_noop = 1").get() as { n: number }).n;
	const pending = (
		db.prepare("SELECT COUNT(*) as n FROM review_plans WHERE status = 'pending' AND is_noop = 0").get() as { n: number }
	).n;
	const approved = (
		db.prepare("SELECT COUNT(*) as n FROM review_plans WHERE status = 'approved'").get() as { n: number }
	).n;
	const skipped = (db.prepare("SELECT COUNT(*) as n FROM review_plans WHERE status = 'skipped'").get() as { n: number })
		.n;
	const done = (db.prepare("SELECT COUNT(*) as n FROM review_plans WHERE status = 'done'").get() as { n: number }).n;
	const error = (db.prepare("SELECT COUNT(*) as n FROM review_plans WHERE status = 'error'").get() as { n: number }).n;
	const manual = (
		db.prepare("SELECT COUNT(*) as n FROM media_items WHERE needs_review = 1 AND original_language IS NULL").get() as {
			n: number;
		}
	).n;
	return { all: total, needs_action: pending, noop: noops, approved, skipped, done, error, manual };
}

function buildWhereClause(filter: string): string {
	switch (filter) {
		case "needs_action":
			return "rp.status = 'pending' AND rp.is_noop = 0";
		case "noop":
			return "rp.is_noop = 1";
		case "manual":
			return "mi.needs_review = 1 AND mi.original_language IS NULL";
		case "approved":
			return "rp.status = 'approved'";
		case "skipped":
			return "rp.status = 'skipped'";
		case "done":
			return "rp.status = 'done'";
		case "error":
			return "rp.status = 'error'";
		default:
			return "1=1";
	}
}

type RawRow = MediaItem & {
	plan_id: number | null;
	plan_status: string | null;
	is_noop: number | null;
	plan_notes: string | null;
	reviewed_at: string | null;
	plan_created_at: string | null;
	remove_count: number;
	keep_count: number;
};

function rowToPlan(r: RawRow): ReviewPlan | null {
	if (r.plan_id == null) return null;
	return {
		id: r.plan_id,
		item_id: r.id,
		status: r.plan_status ?? "pending",
		is_noop: r.is_noop ?? 0,
		notes: r.plan_notes,
		reviewed_at: r.reviewed_at,
		created_at: r.plan_created_at ?? "",
	} as ReviewPlan;
}

function loadItemDetail(db: ReturnType<typeof getDb>, itemId: number) {
	const item = db.prepare("SELECT * FROM media_items WHERE id = ?").get(itemId) as MediaItem | undefined;
	if (!item) return { item: null, streams: [], plan: null, decisions: [], command: null, job: null };

	const streams = db
		.prepare("SELECT * FROM media_streams WHERE item_id = ? ORDER BY stream_index")
		.all(itemId) as MediaStream[];
	const plan = db.prepare("SELECT * FROM review_plans WHERE item_id = ?").get(itemId) as ReviewPlan | undefined | null;
	const decisions = plan
		? (db.prepare("SELECT * FROM stream_decisions WHERE plan_id = ?").all(plan.id) as StreamDecision[])
		: [];

	const command = plan && !plan.is_noop ? buildCommand(item, streams, decisions) : null;

	const job = db
		.prepare(
			`SELECT id, item_id, command, job_type, status, output, exit_code,
                    created_at, started_at, completed_at
             FROM jobs WHERE item_id = ? ORDER BY created_at DESC LIMIT 1`,
		)
		.get(itemId) as Job | undefined;

	return { item, streams, plan: plan ?? null, decisions, command, job: job ?? null };
}

/**
 * Match old custom_titles to new stream IDs after rescan. Keys by a
 * composite of (type, language, stream_index, title) so user overrides
 * survive stream-id changes when Jellyfin re-probes metadata.
 */
export function titleKey(s: {
	type: string;
	language: string | null;
	stream_index: number;
	title: string | null;
}): string {
	return `${s.type}|${s.language ?? ""}|${s.stream_index}|${s.title ?? ""}`;
}

export function reanalyze(db: ReturnType<typeof getDb>, itemId: number, preservedTitles?: Map<string, string>): void {
	const item = db.prepare("SELECT * FROM media_items WHERE id = ?").get(itemId) as MediaItem;
	if (!item) return;

	const streams = db
		.prepare("SELECT * FROM media_streams WHERE item_id = ? ORDER BY stream_index")
		.all(itemId) as MediaStream[];
	const audioLanguages = getAudioLanguages();
	const analysis = analyzeItem(
		{ original_language: item.original_language, needs_review: item.needs_review, container: item.container },
		streams,
		{ audioLanguages },
	);

	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 = 'pending', is_noop = excluded.is_noop, confidence = excluded.confidence, apple_compat = excluded.apple_compat, job_type = excluded.job_type, notes = excluded.notes
	`)
		.run(
			itemId,
			analysis.is_noop ? 1 : 0,
			analysis.confidence,
			analysis.apple_compat,
			analysis.job_type,
			analysis.notes.length > 0 ? analysis.notes.join("\n") : null,
		);

	const plan = db.prepare("SELECT id FROM review_plans WHERE item_id = ?").get(itemId) as { id: number };

	// Preserve existing custom_titles: prefer by stream_id (streams unchanged);
	// fall back to titleKey match (streams regenerated after rescan).
	const byStreamId = new Map<number, string | null>(
		(
			db.prepare("SELECT stream_id, custom_title FROM stream_decisions WHERE plan_id = ?").all(plan.id) as {
				stream_id: number;
				custom_title: string | null;
			}[]
		).map((r) => [r.stream_id, r.custom_title]),
	);
	const streamById = new Map(streams.map((s) => [s.id, s] as const));

	db.prepare("DELETE FROM stream_decisions WHERE plan_id = ?").run(plan.id);
	const insertDecision = db.prepare(
		"INSERT INTO stream_decisions (plan_id, stream_id, action, target_index, custom_title, transcode_codec) VALUES (?, ?, ?, ?, ?, ?)",
	);
	for (const dec of analysis.decisions) {
		let customTitle = byStreamId.get(dec.stream_id) ?? null;
		if (!customTitle && preservedTitles) {
			const s = streamById.get(dec.stream_id);
			if (s) customTitle = preservedTitles.get(titleKey(s)) ?? null;
		}
		insertDecision.run(plan.id, dec.stream_id, dec.action, dec.target_index, customTitle, dec.transcode_codec);
	}
}

/**
 * After the user toggles a stream action, re-run assignTargetOrder and
 * recompute is_noop without wiping user-chosen actions or custom_titles.
 */
function recomputePlanAfterToggle(db: ReturnType<typeof getDb>, itemId: number): void {
	const item = db.prepare("SELECT * FROM media_items WHERE id = ?").get(itemId) as MediaItem | undefined;
	if (!item) return;
	const streams = db
		.prepare("SELECT * FROM media_streams WHERE item_id = ? ORDER BY stream_index")
		.all(itemId) as MediaStream[];
	const plan = db.prepare("SELECT id FROM review_plans WHERE item_id = ?").get(itemId) as { id: number } | undefined;
	if (!plan) return;
	const decisions = db
		.prepare("SELECT stream_id, action, target_index, transcode_codec FROM stream_decisions WHERE plan_id = ?")
		.all(plan.id) as {
		stream_id: number;
		action: "keep" | "remove";
		target_index: number | null;
		transcode_codec: string | null;
	}[];

	const origLang = item.original_language ? normalizeLanguage(item.original_language) : null;
	const audioLanguages = getAudioLanguages();

	// Re-assign target_index based on current actions
	const decWithIdx = decisions.map((d) => ({
		stream_id: d.stream_id,
		action: d.action,
		target_index: null as number | null,
		transcode_codec: d.transcode_codec,
	}));
	assignTargetOrder(streams, decWithIdx, origLang, audioLanguages);

	const updateIdx = db.prepare("UPDATE stream_decisions SET target_index = ? WHERE plan_id = ? AND stream_id = ?");
	for (const d of decWithIdx) updateIdx.run(d.target_index, plan.id, d.stream_id);

	// Recompute is_noop: audio removed OR reordered OR subs exist OR transcode needed
	const anyAudioRemoved = streams.some(
		(s) => s.type === "Audio" && decWithIdx.find((d) => d.stream_id === s.id)?.action === "remove",
	);
	const hasSubs = streams.some((s) => s.type === "Subtitle");
	const needsTranscode = decWithIdx.some((d) => d.transcode_codec != null && d.action === "keep");

	const keptAudio = streams
		.filter((s) => s.type === "Audio" && decWithIdx.find((d) => d.stream_id === s.id)?.action === "keep")
		.sort((a, b) => a.stream_index - b.stream_index);
	let audioOrderChanged = false;
	for (let i = 0; i < keptAudio.length; i++) {
		const dec = decWithIdx.find((d) => d.stream_id === keptAudio[i].id);
		if (dec?.target_index !== i) {
			audioOrderChanged = true;
			break;
		}
	}

	const isNoop = !anyAudioRemoved && !audioOrderChanged && !hasSubs && !needsTranscode;
	db.prepare("UPDATE review_plans SET is_noop = ? WHERE id = ?").run(isNoop ? 1 : 0, plan.id);
}

// ─── Pipeline: summary ───────────────────────────────────────────────────────

interface PipelineAudioStream {
	id: number;
	language: string | null;
	codec: string | null;
	channels: number | null;
	title: string | null;
	is_default: number;
	action: "keep" | "remove";
}

app.get("/pipeline", (c) => {
	const db = getDb();
	const jellyfinUrl = getConfig("jellyfin_url") ?? "";

	// Cap the review column to keep the page snappy at scale; pipelines
	// with thousands of pending items would otherwise ship 10k+ rows on
	// every refresh and re-render every card.
	const REVIEW_LIMIT = 500;
	const review = db
		.prepare(`
		SELECT rp.*, mi.name, mi.series_name, mi.series_jellyfin_id,
			mi.jellyfin_id,
			mi.season_number, mi.episode_number, mi.type, mi.container,
			mi.original_language, mi.orig_lang_source, mi.file_path
		FROM review_plans rp
		JOIN media_items mi ON mi.id = rp.item_id
		WHERE rp.status = 'pending' AND rp.is_noop = 0
		ORDER BY
			CASE rp.confidence WHEN 'high' THEN 0 ELSE 1 END,
			COALESCE(mi.series_name, mi.name),
			mi.season_number, mi.episode_number
		LIMIT ${REVIEW_LIMIT}
	`)
		.all();
	const reviewTotal = (
		db.prepare("SELECT COUNT(*) as n FROM review_plans WHERE status = 'pending' AND is_noop = 0").get() as { n: number }
	).n;

	// Queued gets the same enrichment as review so the card can render
	// streams + transcode reasons read-only (with a "Back to review" button).
	const queued = db
		.prepare(`
		SELECT j.id, j.item_id, j.status, j.started_at, j.completed_at,
			mi.name, mi.series_name, mi.series_jellyfin_id, mi.jellyfin_id,
			mi.season_number, mi.episode_number, mi.type, mi.container,
			mi.original_language, mi.orig_lang_source, mi.file_path,
			rp.id as plan_id, rp.job_type, rp.apple_compat,
			rp.confidence, rp.is_noop
		FROM jobs j
		JOIN media_items mi ON mi.id = j.item_id
		JOIN review_plans rp ON rp.item_id = j.item_id
		WHERE j.status = 'pending'
		ORDER BY j.created_at
	`)
		.all();

	const processing = db
		.prepare(`
		SELECT j.*, mi.name, mi.series_name, mi.type,
			rp.job_type, rp.apple_compat
		FROM jobs j
		JOIN media_items mi ON mi.id = j.item_id
		JOIN review_plans rp ON rp.item_id = j.item_id
		WHERE j.status = 'running'
	`)
		.all();

	const done = db
		.prepare(`
		SELECT j.*, mi.name, mi.series_name, mi.type,
			rp.job_type, rp.apple_compat
		FROM jobs j
		JOIN media_items mi ON mi.id = j.item_id
		JOIN review_plans rp ON rp.item_id = j.item_id
		WHERE j.status IN ('done', 'error')
		ORDER BY j.completed_at DESC
		LIMIT 50
	`)
		.all();

	// "Done" = files already in the desired end state. Either the analyzer
	// says nothing to do (is_noop=1) or a job finished. Use two indexable
	// counts and add — the OR form (is_noop=1 OR status='done') can't use
	// our single-column indexes and gets slow on large libraries.
	const noopRow = db.prepare("SELECT COUNT(*) as n FROM review_plans WHERE is_noop = 1").get() as { n: number };
	const doneRow = db.prepare("SELECT COUNT(*) as n FROM review_plans WHERE status = 'done' AND is_noop = 0").get() as {
		n: number;
	};
	const doneCount = noopRow.n + doneRow.n;

	// Enrich rows that have (plan_id, item_id) with the transcode-reason
	// badges and pre-checked audio streams. Used for both review and queued
	// columns so the queued card can render read-only with the same info.
	type EnrichableRow = { id?: number; plan_id?: number; item_id: number } & {
		transcode_reasons?: string[];
		audio_streams?: PipelineAudioStream[];
	};
	const enrichWithStreamsAndReasons = (rows: EnrichableRow[]) => {
		if (rows.length === 0) return;
		const planIdFor = (r: EnrichableRow): number => (r.plan_id ?? r.id) as number;
		const planIds = rows.map(planIdFor);
		const itemIds = rows.map((r) => r.item_id);

		const reasonPh = planIds.map(() => "?").join(",");
		const allReasons = db
			.prepare(`
			SELECT DISTINCT sd.plan_id, ms.codec, sd.transcode_codec
			FROM stream_decisions sd
			JOIN media_streams ms ON ms.id = sd.stream_id
			WHERE sd.plan_id IN (${reasonPh}) AND sd.transcode_codec IS NOT NULL
		`)
			.all(...planIds) as { plan_id: number; codec: string | null; transcode_codec: string }[];
		const reasonsByPlan = new Map<number, string[]>();
		for (const r of allReasons) {
			if (!reasonsByPlan.has(r.plan_id)) reasonsByPlan.set(r.plan_id, []);
			reasonsByPlan.get(r.plan_id)!.push(`${(r.codec ?? "").toUpperCase()} → ${r.transcode_codec.toUpperCase()}`);
		}

		const streamPh = itemIds.map(() => "?").join(",");
		const streamRows = db
			.prepare(`
			SELECT ms.id, ms.item_id, ms.language, ms.codec, ms.channels, ms.title,
				ms.is_default, sd.action
			FROM media_streams ms
			JOIN review_plans rp ON rp.item_id = ms.item_id
			LEFT JOIN stream_decisions sd ON sd.plan_id = rp.id AND sd.stream_id = ms.id
			WHERE ms.item_id IN (${streamPh}) AND ms.type = 'Audio'
			ORDER BY ms.item_id, ms.stream_index
		`)
			.all(...itemIds) as {
			id: number;
			item_id: number;
			language: string | null;
			codec: string | null;
			channels: number | null;
			title: string | null;
			is_default: number;
			action: "keep" | "remove" | null;
		}[];
		const streamsByItem = new Map<number, PipelineAudioStream[]>();
		for (const r of streamRows) {
			if (!streamsByItem.has(r.item_id)) streamsByItem.set(r.item_id, []);
			streamsByItem.get(r.item_id)!.push({
				id: r.id,
				language: r.language,
				codec: r.codec,
				channels: r.channels,
				title: r.title,
				is_default: r.is_default,
				action: r.action ?? "keep",
			});
		}

		for (const r of rows) {
			r.transcode_reasons = reasonsByPlan.get(planIdFor(r)) ?? [];
			r.audio_streams = streamsByItem.get(r.item_id) ?? [];
		}
	};

	enrichWithStreamsAndReasons(review as EnrichableRow[]);
	enrichWithStreamsAndReasons(queued as EnrichableRow[]);

	return c.json({ review, reviewTotal, queued, processing, done, doneCount, jellyfinUrl });
});

// ─── List ─────────────────────────────────────────────────────────────────────

app.get("/", (c) => {
	const db = getDb();
	const filter = c.req.query("filter") ?? "all";
	const where = buildWhereClause(filter);

	const movieRows = db
		.prepare(`
		SELECT mi.*, rp.id as plan_id, rp.status as plan_status, rp.is_noop, rp.notes as plan_notes,
			rp.reviewed_at, rp.created_at as plan_created_at,
			COUNT(CASE WHEN sd.action = 'remove' THEN 1 END) as remove_count,
			COUNT(CASE WHEN sd.action = 'keep' THEN 1 END) as keep_count
		FROM media_items mi
		LEFT JOIN review_plans rp ON rp.item_id = mi.id
		LEFT JOIN stream_decisions sd ON sd.plan_id = rp.id
		WHERE mi.type = 'Movie' AND ${where}
		GROUP BY mi.id ORDER BY mi.name LIMIT 500
	`)
		.all() as RawRow[];

	const movies = movieRows.map((r) => ({
		item: r as unknown as MediaItem,
		plan: rowToPlan(r),
		removeCount: r.remove_count,
		keepCount: r.keep_count,
	}));

	const series = db
		.prepare(`
		SELECT COALESCE(mi.series_jellyfin_id, mi.series_name) as series_key, mi.series_name,
			MAX(mi.original_language) as original_language,
			COUNT(DISTINCT mi.season_number) as season_count, COUNT(mi.id) as episode_count,
			SUM(CASE WHEN rp.is_noop = 1 THEN 1 ELSE 0 END) as noop_count,
			SUM(CASE WHEN rp.status = 'pending' AND rp.is_noop = 0 THEN 1 ELSE 0 END) as needs_action_count,
			SUM(CASE WHEN rp.status = 'approved' THEN 1 ELSE 0 END) as approved_count,
			SUM(CASE WHEN rp.status = 'skipped' THEN 1 ELSE 0 END) as skipped_count,
			SUM(CASE WHEN rp.status = 'done' THEN 1 ELSE 0 END) as done_count,
			SUM(CASE WHEN rp.status = 'error' THEN 1 ELSE 0 END) as error_count,
			SUM(CASE WHEN mi.needs_review = 1 AND mi.original_language IS NULL THEN 1 ELSE 0 END) as manual_count
		FROM media_items mi
		LEFT JOIN review_plans rp ON rp.item_id = mi.id
		WHERE mi.type = 'Episode' AND ${where}
		GROUP BY series_key ORDER BY mi.series_name
	`)
		.all();

	const totalCounts = countsByFilter(db);
	return c.json({ movies, series, filter, totalCounts });
});

// ─── Series episodes ──────────────────────────────────────────────────────────

app.get("/series/:seriesKey/episodes", (c) => {
	const db = getDb();
	const seriesKey = decodeURIComponent(c.req.param("seriesKey"));

	const rows = db
		.prepare(`
		SELECT mi.*, rp.id as plan_id, rp.status as plan_status, rp.is_noop, rp.notes as plan_notes,
			rp.reviewed_at, rp.created_at as plan_created_at,
			COUNT(CASE WHEN sd.action = 'remove' THEN 1 END) as remove_count, 0 as keep_count
		FROM media_items mi
		LEFT JOIN review_plans rp ON rp.item_id = mi.id
		LEFT JOIN stream_decisions sd ON sd.plan_id = rp.id
		WHERE mi.type = 'Episode'
			AND (mi.series_jellyfin_id = ? OR (mi.series_jellyfin_id IS NULL AND mi.series_name = ?))
		GROUP BY mi.id ORDER BY mi.season_number, mi.episode_number
	`)
		.all(seriesKey, seriesKey) as RawRow[];

	const seasonMap = new Map<number | null, unknown[]>();
	for (const r of rows) {
		const season = (r as unknown as { season_number: number | null }).season_number ?? null;
		if (!seasonMap.has(season)) seasonMap.set(season, []);
		seasonMap.get(season)!.push({ item: r as unknown as MediaItem, plan: rowToPlan(r), removeCount: r.remove_count });
	}

	const seasons = Array.from(seasonMap.entries())
		.sort(([a], [b]) => (a ?? -1) - (b ?? -1))
		.map(([season, episodes]) => ({
			season,
			episodes,
			noopCount: (episodes as { plan: ReviewPlan | null }[]).filter((e) => e.plan?.is_noop).length,
			actionCount: (episodes as { plan: ReviewPlan | null }[]).filter(
				(e) => e.plan?.status === "pending" && !e.plan.is_noop,
			).length,
			approvedCount: (episodes as { plan: ReviewPlan | null }[]).filter((e) => e.plan?.status === "approved").length,
			doneCount: (episodes as { plan: ReviewPlan | null }[]).filter((e) => e.plan?.status === "done").length,
		}));

	return c.json({ seasons });
});

// ─── Approve series ───────────────────────────────────────────────────────────

app.post("/series/:seriesKey/approve-all", (c) => {
	const db = getDb();
	const seriesKey = decodeURIComponent(c.req.param("seriesKey"));
	const pending = db
		.prepare(`
		SELECT rp.*, mi.id as item_id FROM review_plans rp JOIN media_items mi ON mi.id = rp.item_id
		WHERE mi.type = 'Episode' AND (mi.series_jellyfin_id = ? OR (mi.series_jellyfin_id IS NULL AND mi.series_name = ?))
			AND rp.status = 'pending' AND rp.is_noop = 0
	`)
		.all(seriesKey, seriesKey) as (ReviewPlan & { item_id: number })[];
	for (const plan of pending) {
		db.prepare("UPDATE review_plans SET status = 'approved', reviewed_at = datetime('now') WHERE id = ?").run(plan.id);
		const { item, streams, decisions } = loadItemDetail(db, plan.item_id);
		if (item) enqueueAudioJob(db, plan.item_id, buildCommand(item, streams, decisions));
	}
	return c.json({ ok: true, count: pending.length });
});

// ─── Approve season ───────────────────────────────────────────────────────────

app.post("/season/:seriesKey/:season/approve-all", (c) => {
	const db = getDb();
	const seriesKey = decodeURIComponent(c.req.param("seriesKey"));
	const season = Number.parseInt(c.req.param("season") ?? "", 10);
	if (!Number.isFinite(season)) return c.json({ error: "invalid season" }, 400);
	const pending = db
		.prepare(`
		SELECT rp.*, mi.id as item_id FROM review_plans rp JOIN media_items mi ON mi.id = rp.item_id
		WHERE mi.type = 'Episode' AND (mi.series_jellyfin_id = ? OR (mi.series_jellyfin_id IS NULL AND mi.series_name = ?))
			AND mi.season_number = ? AND rp.status = 'pending' AND rp.is_noop = 0
	`)
		.all(seriesKey, seriesKey, season) as (ReviewPlan & { item_id: number })[];
	for (const plan of pending) {
		db.prepare("UPDATE review_plans SET status = 'approved', reviewed_at = datetime('now') WHERE id = ?").run(plan.id);
		const { item, streams, decisions } = loadItemDetail(db, plan.item_id);
		if (item) enqueueAudioJob(db, plan.item_id, buildCommand(item, streams, decisions));
	}
	return c.json({ ok: true, count: pending.length });
});

// ─── Approve all ──────────────────────────────────────────────────────────────

app.post("/approve-all", (c) => {
	const db = getDb();
	const pending = db
		.prepare(
			"SELECT rp.*, mi.id as item_id FROM review_plans rp JOIN media_items mi ON mi.id = rp.item_id WHERE rp.status = 'pending' AND rp.is_noop = 0",
		)
		.all() as (ReviewPlan & { item_id: number })[];
	for (const plan of pending) {
		db.prepare("UPDATE review_plans SET status = 'approved', reviewed_at = datetime('now') WHERE id = ?").run(plan.id);
		const { item, streams, decisions } = loadItemDetail(db, plan.item_id);
		if (item) enqueueAudioJob(db, plan.item_id, buildCommand(item, streams, decisions));
	}
	return c.json({ ok: true, count: pending.length });
});

// ─── Batch approve (by item id list) ─────────────────────────────────────────
// Used by the "approve up to here" affordance in the review column. The
// client knows the visible order (movies + series sort-key) and passes in
// the prefix of item ids it wants approved in one round-trip. Items that
// aren't pending (already approved / skipped / done) are silently ignored
// so the endpoint is idempotent against stale client state.
app.post("/approve-batch", async (c) => {
	const db = getDb();
	const body = await c.req.json<{ itemIds?: unknown }>().catch(() => ({ itemIds: undefined }));
	if (
		!Array.isArray(body.itemIds) ||
		!body.itemIds.every((v) => typeof v === "number" && Number.isInteger(v) && v > 0)
	) {
		return c.json({ ok: false, error: "itemIds must be an array of positive integers" }, 400);
	}
	const ids = body.itemIds as number[];
	if (ids.length === 0) return c.json({ ok: true, count: 0 });

	const placeholders = ids.map(() => "?").join(",");
	const pending = db
		.prepare(
			`SELECT rp.*, mi.id as item_id FROM review_plans rp JOIN media_items mi ON mi.id = rp.item_id
			 WHERE rp.status = 'pending' AND rp.is_noop = 0 AND mi.id IN (${placeholders})`,
		)
		.all(...ids) as (ReviewPlan & { item_id: number })[];

	let count = 0;
	for (const plan of pending) {
		db.prepare("UPDATE review_plans SET status = 'approved', reviewed_at = datetime('now') WHERE id = ?").run(plan.id);
		const { item, streams, decisions } = loadItemDetail(db, plan.item_id);
		if (item) {
			enqueueAudioJob(db, plan.item_id, buildCommand(item, streams, decisions));
			count++;
		}
	}
	return c.json({ ok: true, count });
});

// ─── Auto-approve high-confidence ────────────────────────────────────────────
// Approves every pending plan whose original language came from an authoritative
// source (radarr/sonarr). Anything with low confidence keeps needing a human.
app.post("/auto-approve", (c) => {
	const db = getDb();
	const pending = db
		.prepare(
			"SELECT rp.*, mi.id as item_id FROM review_plans rp JOIN media_items mi ON mi.id = rp.item_id WHERE rp.status = 'pending' AND rp.is_noop = 0 AND rp.confidence = 'high'",
		)
		.all() as (ReviewPlan & { item_id: number })[];
	for (const plan of pending) {
		db.prepare("UPDATE review_plans SET status = 'approved', reviewed_at = datetime('now') WHERE id = ?").run(plan.id);
		const { item, streams, decisions } = loadItemDetail(db, plan.item_id);
		if (item) enqueueAudioJob(db, plan.item_id, buildCommand(item, streams, decisions));
	}
	return c.json({ ok: true, count: pending.length });
});

// ─── Detail ───────────────────────────────────────────────────────────────────

app.get("/:id", (c) => {
	const db = getDb();
	const id = parseId(c.req.param("id"));
	if (id == null) return c.json({ error: "invalid id" }, 400);
	const detail = loadItemDetail(db, id);
	if (!detail.item) return c.notFound();
	return c.json(detail);
});

// ─── Override language ────────────────────────────────────────────────────────

app.patch("/:id/language", async (c) => {
	const db = getDb();
	const id = parseId(c.req.param("id"));
	if (id == null) return c.json({ error: "invalid id" }, 400);
	const body = await c.req.json<{ language: string | null }>();
	const lang = body.language || null;
	db
		.prepare("UPDATE media_items SET original_language = ?, orig_lang_source = 'manual', needs_review = 0 WHERE id = ?")
		.run(lang ? normalizeLanguage(lang) : null, id);
	reanalyze(db, id);
	const detail = loadItemDetail(db, id);
	if (!detail.item) return c.notFound();
	return c.json(detail);
});

// ─── Edit stream title ────────────────────────────────────────────────────────

app.patch("/:id/stream/:streamId/title", async (c) => {
	const db = getDb();
	const itemId = parseId(c.req.param("id"));
	const streamId = parseId(c.req.param("streamId"));
	if (itemId == null || streamId == null) return c.json({ error: "invalid id" }, 400);
	const body = await c.req.json<{ title: string }>();
	const title = (body.title ?? "").trim() || null;
	const plan = db.prepare("SELECT id FROM review_plans WHERE item_id = ?").get(itemId) as { id: number } | undefined;
	if (!plan) return c.notFound();
	db
		.prepare("UPDATE stream_decisions SET custom_title = ? WHERE plan_id = ? AND stream_id = ?")
		.run(title, plan.id, streamId);
	const detail = loadItemDetail(db, itemId);
	if (!detail.item) return c.notFound();
	return c.json(detail);
});

// ─── Toggle stream action ─────────────────────────────────────────────────────

app.patch("/:id/stream/:streamId", async (c) => {
	const db = getDb();
	const itemId = parseId(c.req.param("id"));
	const streamId = parseId(c.req.param("streamId"));
	if (itemId == null || streamId == null) return c.json({ error: "invalid id" }, 400);

	const body = await c.req.json<{ action: unknown }>().catch(() => ({ action: null }));
	if (!isOneOf(body.action, ["keep", "remove"] as const)) {
		return c.json({ error: 'action must be "keep" or "remove"' }, 400);
	}
	const action: "keep" | "remove" = body.action;

	// Only audio streams can be toggled — subtitles are always removed (extracted to sidecar)
	const stream = db.prepare("SELECT type, item_id FROM media_streams WHERE id = ?").get(streamId) as
		| { type: string; item_id: number }
		| undefined;
	if (!stream || stream.item_id !== itemId) return c.json({ error: "stream not found on item" }, 404);
	if (stream.type === "Subtitle") return c.json({ error: "Subtitle streams cannot be toggled" }, 400);

	const plan = db.prepare("SELECT id FROM review_plans WHERE item_id = ?").get(itemId) as { id: number } | undefined;
	if (!plan) return c.notFound();
	db
		.prepare("UPDATE stream_decisions SET action = ? WHERE plan_id = ? AND stream_id = ?")
		.run(action, plan.id, streamId);

	recomputePlanAfterToggle(db, itemId);

	const detail = loadItemDetail(db, itemId);
	if (!detail.item) return c.notFound();
	return c.json(detail);
});

// ─── Approve ──────────────────────────────────────────────────────────────────

app.post("/:id/approve", (c) => {
	const db = getDb();
	const id = parseId(c.req.param("id"));
	if (id == null) return c.json({ error: "invalid id" }, 400);
	const plan = db.prepare("SELECT * FROM review_plans WHERE item_id = ?").get(id) as ReviewPlan | undefined;
	if (!plan) return c.notFound();
	db.prepare("UPDATE review_plans SET status = 'approved', reviewed_at = datetime('now') WHERE id = ?").run(plan.id);
	if (!plan.is_noop) {
		const { item, streams, decisions } = loadItemDetail(db, id);
		if (item) enqueueAudioJob(db, id, buildCommand(item, streams, decisions));
	}
	return c.json({ ok: true });
});

// ─── Unapprove ───────────────────────────────────────────────────────────────

// ─── Retry failed job ─────────────────────────────────────────────────────────

app.post("/:id/retry", (c) => {
	const db = getDb();
	const id = parseId(c.req.param("id"));
	if (id == null) return c.json({ error: "invalid id" }, 400);
	const plan = db.prepare("SELECT * FROM review_plans WHERE item_id = ?").get(id) as ReviewPlan | undefined;
	if (!plan) return c.notFound();
	if (plan.status !== "error") return c.json({ ok: false, error: "Only failed plans can be retried" }, 409);

	// Clear old errored/done jobs for this item so the queue starts clean
	db.prepare("DELETE FROM jobs WHERE item_id = ? AND status IN ('error', 'done')").run(id);

	// Rebuild the command from the current decisions (streams may have been edited)
	const { item, command } = loadItemDetail(db, id);
	if (!item || !command) return c.json({ ok: false, error: "Cannot rebuild command" }, 400);

	enqueueAudioJob(db, id, command);
	db.prepare("UPDATE review_plans SET status = 'approved', reviewed_at = datetime('now') WHERE id = ?").run(plan.id);
	return c.json({ ok: true });
});

// Reopen a completed or errored plan: flip it back to pending so the user
// can adjust decisions and re-approve. Used by the Done column's hover
// "Back to review" affordance. Unlike /unapprove (which rolls back an
// approved-but-not-yet-running plan), this handles the post-job states
// and drops the lingering job row so the pipeline doesn't show leftover
// history for an item that's about to be re-queued.
app.post("/:id/reopen", (c) => {
	const db = getDb();
	const id = parseId(c.req.param("id"));
	if (id == null) return c.json({ error: "invalid id" }, 400);
	const plan = db.prepare("SELECT * FROM review_plans WHERE item_id = ?").get(id) as ReviewPlan | undefined;
	if (!plan) return c.notFound();
	if (plan.status !== "done" && plan.status !== "error") {
		return c.json({ ok: false, error: "Can only reopen plans with status done or error" }, 409);
	}
	db.transaction(() => {
		// Leave plan.notes alone so the user keeps any ffmpeg error summary
		// from the prior run — useful context when redeciding decisions.
		db.prepare("UPDATE review_plans SET status = 'pending', reviewed_at = NULL WHERE id = ?").run(plan.id);
		db.prepare("DELETE FROM jobs WHERE item_id = ? AND status IN ('done', 'error')").run(id);
	})();
	return c.json({ ok: true });
});

app.post("/:id/unapprove", (c) => {
	const db = getDb();
	const id = parseId(c.req.param("id"));
	if (id == null) return c.json({ error: "invalid id" }, 400);
	const plan = db.prepare("SELECT * FROM review_plans WHERE item_id = ?").get(id) as ReviewPlan | undefined;
	if (!plan) return c.notFound();
	if (plan.status !== "approved")
		return c.json({ ok: false, error: "Can only unapprove items with status approved" }, 409);
	// Only allow if the associated job hasn't started yet
	const job = db.prepare("SELECT * FROM jobs WHERE item_id = ? ORDER BY created_at DESC LIMIT 1").get(id) as
		| { id: number; status: string }
		| undefined;
	if (job && job.status !== "pending")
		return c.json({ ok: false, error: "Job already started — cannot unapprove" }, 409);
	// Delete the pending job and revert plan status
	if (job) db.prepare("DELETE FROM jobs WHERE id = ?").run(job.id);
	db.prepare("UPDATE review_plans SET status = 'pending', reviewed_at = NULL WHERE id = ?").run(plan.id);
	return c.json({ ok: true });
});

// ─── Skip / Unskip ───────────────────────────────────────────────────────────

app.post("/skip-all", (c) => {
	const db = getDb();
	const result = db
		.prepare(
			"UPDATE review_plans SET status = 'skipped', reviewed_at = datetime('now') WHERE status = 'pending' AND is_noop = 0",
		)
		.run();
	return c.json({ ok: true, skipped: result.changes });
});

app.post("/:id/skip", (c) => {
	const db = getDb();
	const id = parseId(c.req.param("id"));
	if (id == null) return c.json({ error: "invalid id" }, 400);
	db.prepare("UPDATE review_plans SET status = 'skipped', reviewed_at = datetime('now') WHERE item_id = ?").run(id);
	return c.json({ ok: true });
});

app.post("/:id/unskip", (c) => {
	const db = getDb();
	const id = parseId(c.req.param("id"));
	if (id == null) return c.json({ error: "invalid id" }, 400);
	db
		.prepare("UPDATE review_plans SET status = 'pending', reviewed_at = NULL WHERE item_id = ? AND status = 'skipped'")
		.run(id);
	return c.json({ ok: true });
});

// ─── Rescan ───────────────────────────────────────────────────────────────────

app.post("/:id/rescan", async (c) => {
	const db = getDb();
	const id = parseId(c.req.param("id"));
	if (id == null) return c.json({ error: "invalid id" }, 400);
	const item = db.prepare("SELECT * FROM media_items WHERE id = ?").get(id) as MediaItem | undefined;
	if (!item) return c.notFound();

	const cfg = getAllConfig();
	const jfCfg = { url: cfg.jellyfin_url, apiKey: cfg.jellyfin_api_key, userId: cfg.jellyfin_user_id };

	// Trigger Jellyfin's internal metadata probe and wait for it to finish
	// so the streams we fetch afterwards reflect the current file on disk.
	await refreshItem(jfCfg, item.jellyfin_id);

	// Snapshot custom_titles keyed by stable properties, since replacing
	// media_streams cascades away all stream_decisions.
	const preservedTitles = new Map<string, string>();
	const oldRows = db
		.prepare(`
		SELECT ms.type, ms.language, ms.stream_index, ms.title, sd.custom_title
		FROM stream_decisions sd
		JOIN media_streams ms ON ms.id = sd.stream_id
		JOIN review_plans rp ON rp.id = sd.plan_id
		WHERE rp.item_id = ? AND sd.custom_title IS NOT NULL
	`)
		.all(id) as {
		type: string;
		language: string | null;
		stream_index: number;
		title: string | null;
		custom_title: string;
	}[];
	for (const r of oldRows) {
		preservedTitles.set(titleKey(r), r.custom_title);
	}

	const fresh = await getItem(jfCfg, item.jellyfin_id);
	if (fresh) {
		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 (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
		`);
		db.prepare("DELETE FROM media_streams WHERE item_id = ?").run(id);
		for (const jStream of fresh.MediaStreams ?? []) {
			if (jStream.IsExternal) continue; // skip external subs — not embedded in container
			const s = mapStream(jStream);
			insertStream.run(
				id,
				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,
			);
		}
	}

	reanalyze(db, id, preservedTitles);
	const detail = loadItemDetail(db, id);
	if (!detail.item) return c.notFound();
	return c.json(detail);
});

// ─── Pipeline: series language ───────────────────────────────────────────────

app.patch("/series/:seriesKey/language", async (c) => {
	const seriesKey = decodeURIComponent(c.req.param("seriesKey"));
	const { language } = await c.req.json<{ language: string }>();
	const db = getDb();

	const items = db
		.prepare(
			"SELECT id FROM media_items WHERE series_jellyfin_id = ? OR (series_jellyfin_id IS NULL AND series_name = ?)",
		)
		.all(seriesKey, seriesKey) as { id: number }[];

	const normalizedLang = language ? normalizeLanguage(language) : null;
	for (const item of items) {
		db
			.prepare("UPDATE media_items SET original_language = ?, orig_lang_source = 'manual', needs_review = 0 WHERE id = ?")
			.run(normalizedLang, item.id);
	}

	// Re-analyze all episodes
	for (const item of items) {
		reanalyze(db, item.id);
	}

	return c.json({ updated: items.length });
});

export default app;