visionA/local-tool/visiona-local/frontend/app.js

// visionA Local — splash / bootstrap
// 職責：等 Go server 起來，拿到 URL 後跳轉到 Next.js 主 UI

import { GetServerStatus, GetServerURL } from './wailsjs/go/main/App.js';

const statusEl = document.getElementById('status');
const errorEl = document.getElementById('error');

const POLL_INTERVAL_MS = 500;
const MAX_WAIT_MS = 60_000;
const startTime = Date.now();

async function poll() {
    if (Date.now() - startTime > MAX_WAIT_MS) {
        showError('伺服器啟動逾時（60 秒），請檢查 log 或重新啟動應用程式。');
        return;
    }

    try {
        const status = await GetServerStatus();
        if (status && status.lastError) {
            showError('伺服器啟動失敗：' + status.lastError);
            return;
        }
        if (status && status.running && status.url) {
            statusEl.textContent = '啟動完成，載入主介面...';
            window.location.replace(status.url + '/');
            return;
        }

        const url = await GetServerURL();
        if (url) {
            statusEl.textContent = '啟動完成，載入主介面...';
            window.location.replace(url + '/');
            return;
        }
    } catch (e) {
        // binding 尚未就緒時會 throw，忽略繼續輪詢
    }

    setTimeout(poll, POLL_INTERVAL_MS);
}

function showError(msg) {
    statusEl.hidden = true;
    errorEl.textContent = msg;
    errorEl.hidden = false;
}

// 等 Wails runtime 就緒再開始輪詢
if (window.runtime) {
    poll();
} else {
    window.addEventListener('load', () => setTimeout(poll, 200));
}