#!/usr/bin/env bun
// Dev/debug CLI (design §8) — reuses the engine one-shot. `scan`/`detect`/`preview` are offline (no
// host needed); `sync`/`uninstall` connect to the host and reconcile. Handy for configuring a headless
// box or checking what a `config.json` will produce before pushing it to the library.
//
//   bunx punktfunk-plugin-rom-manager scan       # what the scanner finds
//   bunx punktfunk-plugin-rom-manager detect     # which emulators are installed
//   bunx punktfunk-plugin-rom-manager preview    # the desired library (no host write)
//   bunx punktfunk-plugin-rom-manager sync        # reconcile into the live library
//   bunx punktfunk-plugin-rom-manager uninstall   # remove all this plugin's entries
//   bunx punktfunk-plugin-rom-manager set-password <pw>   # standalone-UI password

import { connect } from "@punktfunk/host";
import type { Config } from "./config.js";
import { detectAll, realDetectEnv, resolveEmulators } from "./emulators.js";
import { Engine } from "./engine/index.js";
import { computeDesired, enumerateTitles } from "./engine/reconcile.js";
import { type RomCandidate, realScanFs, scanRoot } from "./engine/scanner.js";
import { resolvePlatforms } from "./platforms.js";
import { currentOs } from "./quote.js";
import { hashPassword } from "./server/password.js";
import { loadCache, loadConfig, saveConfig } from "./state.js";

const scanAll = (config: Config): RomCandidate[] => {
	const platforms = resolvePlatforms(config.platforms);
	const out: RomCandidate[] = [];
	for (const root of config.roots) {
		const platform = platforms.get(root.platform);
		if (!platform) {
			console.error(`! root ${root.dir}: unknown platform "${root.platform}"`);
			continue;
		}
		out.push(...scanRoot(realScanFs, root.dir, platform, root.excludes));
	}
	return out;
};

const cmdScan = (): void => {
	const config = loadConfig();
	if (config.roots.length === 0) {
		console.log(
			"No ROM roots configured. Add some to config.json or via the UI.",
		);
		return;
	}
	const scan = scanAll(config);
	const { survivors, skipped } = enumerateTitles(config, scan);
	const perPlatform = new Map<string, number>();
	for (const s of survivors)
		perPlatform.set(s.platform.id, (perPlatform.get(s.platform.id) ?? 0) + 1);
	console.log(
		`Scanned ${config.roots.length} root(s): ${scan.length} candidate file(s), ${survivors.length} title(s).`,
	);
	for (const [id, n] of [...perPlatform].sort()) console.log(`  ${id}: ${n}`);
	if (skipped.length)
		console.log(`  (${skipped.length} skipped by exclude/dedupe)`);
};

const cmdDetect = (): void => {
	const config = loadConfig();
	const detected = detectAll(
		realDetectEnv(),
		resolveEmulators(config.emulators).values(),
	);
	if (detected.length === 0) {
		console.log("No emulators detected.");
		return;
	}
	console.log(`Detected ${detected.length} emulator(s):`);
	for (const d of detected) {
		const cores = d.cores?.length ? ` — ${d.cores.length} core(s)` : "";
		console.log(
			`  ${d.id} (${d.via})${d.contested ? " [contested]" : ""}${cores}`,
		);
	}
};

const cmdPreview = (): void => {
	const config = loadConfig();
	const scan = scanAll(config);
	const detected = detectAll(
		realDetectEnv(),
		resolveEmulators(config.emulators).values(),
	);
	const cache = loadCache();
	const { entries, report } = computeDesired({
		config,
		scan,
		detected,
		art: cache.art,
		os: currentOs(),
	});
	console.log(
		`Preview: ${entries.length} entr(y/ies) would be reconciled${report.overWarn ? " [scale warning]" : ""}.`,
	);
	for (const e of entries.slice(0, 40))
		console.log(`  ${e.external_id}  →  ${e.launch?.value ?? "(no launch)"}`);
	if (entries.length > 40) console.log(`  … and ${entries.length - 40} more`);
	if (report.skipped.length) {
		console.log(`\n${report.skipped.length} skipped:`);
		for (const s of report.skipped.slice(0, 20))
			console.log(`  ${s.title}: ${s.reason}`);
	}
	for (const w of report.warnings.slice(0, 10)) console.log(`! ${w}`);
};

const cmdSync = async (): Promise<void> => {
	const pf = await connect();
	try {
		const engine = new Engine({ pf });
		const report = await engine.sync("cli");
		if (report) {
			console.log(
				`Synced: ${report.included} entr(y/ies), ${report.skipped.length} skipped.`,
			);
		} else {
			console.log("Sync did not complete (see log).");
		}
	} finally {
		pf.close();
	}
};

const cmdUninstall = async (): Promise<void> => {
	const pf = await connect();
	try {
		await new Engine({ pf }).uninstall();
		console.log("Removed all rom-manager entries from the library.");
	} finally {
		pf.close();
	}
};

const cmdSetPassword = (password: string | undefined): void => {
	if (!password) {
		console.error("usage: set-password <password>");
		process.exitCode = 2;
		return;
	}
	const config = loadConfig();
	config.ui.passwordHash = hashPassword(password);
	saveConfig(config);
	console.log("Standalone-UI password set (config.ui.passwordHash).");
};

const main = async (): Promise<void> => {
	const [cmd, arg] = process.argv.slice(2);
	switch (cmd) {
		case "scan":
			return cmdScan();
		case "detect":
			return cmdDetect();
		case "preview":
			return cmdPreview();
		case "sync":
			return cmdSync();
		case "uninstall":
			return cmdUninstall();
		case "set-password":
			return cmdSetPassword(arg);
		default:
			console.log(
				"usage: punktfunk-plugin-rom-manager <scan|detect|preview|sync|uninstall|set-password>",
			);
			process.exitCode = cmd ? 2 : 0;
	}
};

await main();