// Typed client for the plugin-local API (relative paths — the SPA is mounted under the console proxy
// prefix, so `api/...` resolves to `/plugin-ui/rom-manager/api/...`). Types mirror the backend.
import { useEffect, useState } from "react";

export interface Platform {
	id: string;
	name: string;
	extensions: string[];
	libretroSystem?: string;
	defaultLaunch: { emulator: string; core?: string; extraArgs?: string };
	disc?: boolean;
}
export interface EmulatorDef {
	id: string;
	name: string;
	template: string;
	supportsArchives: boolean;
	contested?: boolean;
	detect?: { linux: string[]; windows: string[] };
}
export interface Detected {
	id: string;
	name: string;
	via: "path" | "file" | "flatpak";
	exeToken: string;
	contested?: boolean;
	coresDir?: string;
	cores?: string[];
}
export interface RomRoot {
	dir: string;
	platform: string;
	excludes?: string[];
}
export interface GameOverride {
	exclude?: boolean;
	emulator?: string;
	core?: string;
	extraArgs?: string;
	title?: string;
	art?: string;
}
export interface Config {
	roots: RomRoot[];
	platformLaunch: Record<
		string,
		{ emulator: string; core?: string; extraArgs?: string }
	>;
	gameOverrides: Record<string, GameOverride>;
	/** Operator-added / overriding emulator defs (custom launchers). */
	emulators?: EmulatorDef[];
	sync: {
		pollMinutes: number;
		watch: boolean;
		debounceMs: number;
		dedupeRegions: string[];
		regionPriority: string[];
		warnEntries: number;
		maxEntries: number;
		closeOnEnd: boolean;
	};
	art: {
		enabled: boolean;
		provider: "auto" | "steamgriddb" | "libretro";
		steamGridDbKey?: string;
	};
	ui: {
		standalone: boolean;
		port: number;
		bind: string;
		passwordHash?: string;
	};
	devEntry: boolean;
}
export interface Artwork {
	portrait?: string | null;
	hero?: string | null;
	logo?: string | null;
	header?: string | null;
}
export interface Entry {
	external_id: string;
	title: string;
	launch?: { kind: string; value: string } | null;
	art?: Artwork;
	prep?: { do: string; undo?: string | null }[];
}
export interface Skipped {
	external_id: string;
	title: string;
	reason: string;
}
export interface Report {
	considered: number;
	included: number;
	skipped: Skipped[];
	excluded: { external_id: string; title: string }[];
	warnings: string[];
	truncated: number;
	perPlatform: Record<string, number>;
	overWarn: boolean;
}
export interface Preview {
	entries: Entry[];
	report: Report;
	detected: Detected[];
}
export interface Status {
	rootsConfigured: number;
	os: "linux" | "windows";
	artProvider: string | null;
	lastSync?: { fingerprint: string; count: number; at: number };
	lastReport?: Report;
	detected?: { at: number; emulators: Detected[] };
	paths: { dir: string; config: string; cache: string; relConfig: string };
	syncing: boolean;
}

const api = async <T>(path: string, opts?: RequestInit): Promise<T> => {
	const res = await fetch(path, {
		headers: { "content-type": "application/json" },
		...opts,
	});
	if (!res.ok) {
		const body = (await res.json().catch(() => ({}))) as { error?: string };
		throw new Error(body.error ?? `HTTP ${res.status}`);
	}
	return (await res.json()) as T;
};

export const getStatus = () => api<Status>("api/status");
export const getConfig = () => api<Config>("api/config");
export const putConfig = (config: Config) =>
	api<Config>("api/config", { method: "PUT", body: JSON.stringify(config) });
export const getPreview = () => api<Preview>("api/preview");
export const runDetect = () =>
	api<Detected[]>("api/detect", { method: "POST" });
export const runSync = () => api<Report>("api/sync", { method: "POST" });
export const getPlatforms = () => api<Platform[]>("api/platforms");
export const getEmulators = () =>
	api<{ defs: EmulatorDef[]; detected: Detected[] }>("api/emulators");

/** Live engine status via SSE (falls back to a one-shot fetch if EventSource fails). */
export const useStatusStream = (): Status | undefined => {
	const [status, setStatus] = useState<Status>();
	useEffect(() => {
		getStatus()
			.then(setStatus)
			.catch(() => {});
		try {
			const es = new EventSource("api/events");
			es.addEventListener("status", (e) => {
				try {
					setStatus(JSON.parse((e as MessageEvent).data));
				} catch {
					// ignore malformed frame
				}
			});
			return () => es.close();
		} catch {
			return;
		}
	}, []);
	return status;
};