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// SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

import {
	ProtoRPCProvider,
	type ProtoRPC,
	ThemeProvider,
	ThirdPartyNoticeProvider,
	HistoryAPIRouterProvider,
	Page,
} from "@yamori/react_ui";
import { createRoot } from "react-dom/client";

import css from "./main.module.css";
import { Message, isValidMessage } from "./worker/message.ts";

import type { IncomingMessage, OutgoingMessage } from "@yamori/backend";

function isOutgoingMessage(x: unknown): x is OutgoingMessage {
	if (!x || typeof x !== "object" || !("type" in x)) {
		return false;
	}

	switch (x.type) {
		case "response":
		case "error":
		case "ready":
			return true;
		default:
			return false;
	}
}

async function readThirdPartyNotice() {
	const resp = await fetch("/third-party.txt");

	return resp.text();
}

const worker = new Worker(new URL("./worker/main.ts", import.meta.url), {
	type: "module",
});

const root = createRoot(document.body);

worker.addEventListener("message", (event) => {
	if (event.data !== "ready") {
		return;
	}

	const rpc: ProtoRPC = {
		send(service, method, data) {
			const id = crypto.randomUUID();

			return new Promise((resolve) => {
				const onMessage = (event: MessageEvent) => {
					if (!isValidMessage(event.data) || event.data.id !== id) {
						return;
					}

					resolve(event.data.data);
					worker.removeEventListener("message", onMessage);
				};

				worker.addEventListener("message", onMessage);

				worker.postMessage({
					id,
					service,
					method,
					data,
				} satisfies Message);
			});
		},
	};

	root.render(
		<ThirdPartyNoticeProvider text={readThirdPartyNotice}>
			<HistoryAPIRouterProvider>
				<ProtoRPCProvider rpc={rpc}>
					<ThemeProvider className={css.theme}>
						<Page />
					</ThemeProvider>
				</ProtoRPCProvider>
			</HistoryAPIRouterProvider>
		</ThirdPartyNoticeProvider>,
	);
});

const backend = new Worker(new URL("./worker/backend.ts", import.meta.url), {
	type: "module",
});

backend.addEventListener(
	"message",
	(event) => {
		if (!isOutgoingMessage(event.data) || event.data.type !== "ready") {
			return;
		}

		backend.addEventListener("message", (event) => {
			if (!isOutgoingMessage(event.data)) {
				return;
			}

			switch (event.data.type) {
				case "response": {
					console.dir(event.data);
					return;
				}
				case "error": {
					console.error(event.data.error);
					return;
				}
			}
		});

		backend.postMessage({
			type: "request",
			service: "yamori.meta.v1",
			method: "Ping",
			data: new Uint8Array([]),
		} satisfies IncomingMessage);
	},
	{
		once: true,
	},
);