/**
 * Outbound HTTP to the Frappe `st.api.foundry.*` endpoints.
 *
 * All calls are POST with `X-Bridge-Secret` and `X-Bridge-World` headers.
 * Bodies are JSON. Errors include the Frappe server message when present.
 */

import { MODULE_ID } from "./constants.js";

function getConfig() {
	const baseUrl = (game.settings.get(MODULE_ID, "frappeBaseUrl") || "").replace(/\/+$/, "");
	const secret = game.settings.get(MODULE_ID, "sharedSecret") || "";
	const worldId = game.settings.get(MODULE_ID, "worldId") || game.world?.id || "";
	return { baseUrl, secret, worldId };
}

async function bridgeFetch(method, body) {
	const { baseUrl, secret, worldId } = getConfig();
	if (!baseUrl) throw new Error("Bridge not configured: set Frappe Base URL in module settings.");
	if (!secret) throw new Error("Bridge not configured: set Shared Secret in module settings.");
	if (!worldId) throw new Error("Bridge not configured: World ID could not be determined.");

	const url = `${baseUrl}/api/method/st.api.foundry.${method}`;
	const res = await fetch(url, {
		method: "POST",
		headers: {
			"Content-Type": "application/json",
			"X-Bridge-Secret": secret,
			"X-Bridge-World": worldId,
		},
		body: JSON.stringify(body),
	});

	if (!res.ok) {
		let detail = "";
		try {
			const json = await res.json();
			detail = json._server_messages || json.exception || JSON.stringify(json);
		} catch {
			detail = await res.text();
		}
		throw new Error(`Bridge ${method} failed: ${res.status} ${res.statusText} — ${detail}`);
	}
	return await res.json();
}

/**
 * Produce a player display name for an actor by inspecting Foundry's
 * ownership map. Returns the first non-GM user with OWNER permission, or
 * null if none exists. The Frappe side reads this from `_player_name`
 * during snapshot extraction (see `_actor_player_name` in foundry.py).
 */
function resolvePlayerName(actor) {
	const ownership = actor.ownership || {};
	for (const [userId, level] of Object.entries(ownership)) {
		if (userId === "default") continue;
		if (level < CONST.DOCUMENT_OWNERSHIP_LEVELS.OWNER) continue;
		const user = game.users.get(userId);
		if (user && !user.isGM) return user.name;
	}
	return null;
}

function buildManifest() {
	return game.actors
		.filter((a) => a.type === "character")
		.map((a) => ({
			id: a.id,
			name: a.name,
			player: resolvePlayerName(a),
		}));
}

export async function pushManifest() {
	const actors = buildManifest();
	console.log(`[${MODULE_ID}] pushing manifest with ${actors.length} actor(s)`);
	const result = await bridgeFetch("receive_actor_index", { actors });
	console.log(`[${MODULE_ID}] manifest result:`, result);
	return result;
}

/**
 * Round-trip an empty manifest push to verify URL, secret, world ID, and
 * Frappe-side enablement. Surfaces the result in the Foundry UI.
 */
export async function testConnection() {
	console.log(`[${MODULE_ID}] testing connection...`);
	try {
		const result = await bridgeFetch("receive_actor_index", { actors: [] });
		const received = result?.message?.received ?? 0;
		ui.notifications.info(`Seitime Bridge OK — server accepted ${received} actor(s).`);
		return result;
	} catch (err) {
		ui.notifications.error(`Seitime Bridge: ${err.message}`);
		throw err;
	}
}