import { toast } from '$lib/stores/toasts.js';
import { getSocketId } from '$lib/stores/socket.js';

export type ApiResult<T = any> = {
	ok: boolean;
	data: T;
	status: number;
};

export async function api<T = any>(
	url: string,
	opts: RequestInit = {}
): Promise<ApiResult<T>> {
	const headers = new Headers(opts.headers);

	// Auto-set JSON content type for non-FormData bodies
	if (opts.body && !(opts.body instanceof FormData) && !headers.has('Content-Type')) {
		headers.set('Content-Type', 'application/json');
	}

	// Pass socket ID for self-dedup
	const sid = getSocketId();
	if (sid) {
		headers.set('X-Socket-ID', sid);
	}

	try {
		const res = await fetch(url, { ...opts, headers });
		let data: any = null;

		const contentType = res.headers.get('content-type');
		if (contentType?.includes('application/json')) {
			data = await res.json();
		}

		if (!res.ok) {
			const msg = data?.error || data?.message || `Request failed (${res.status})`;
			toast.error(msg);
			return { ok: false, data, status: res.status };
		}

		return { ok: true, data, status: res.status };
	} catch {
		toast.error('Network error. Please try again.');
		return { ok: false, data: null as any, status: 0 };
	}
}