// control-panel.js — Header / Status / Primary controls / Error banner / Toast
import { t } from './i18n.js';

// ---------- Server state 常數 ----------
// 必須與 Go 端 server_control.go §ServerState 常數對齊（全部 lowercase）。
// 千萬不要改成 PascalCase，會讓 state 比對全面失敗。
export const STATE_IDLE     = 'idle';
export const STATE_STARTING = 'starting';
export const STATE_RUNNING  = 'running';
export const STATE_STOPPING = 'stopping';
export const STATE_STOPPED  = 'stopped';
export const STATE_ERROR    = 'error';

// ---------- Server state ----------
export function setServerState(status) {
    const root = document.getElementById('app');
    const dot = document.getElementById('status-dot');
    const textEl = document.getElementById('status-text');
    if (!status) return;
    const s = status.state || STATE_IDLE;
    root.setAttribute('data-state', s);
    dot.className = 'status-dot state-' + s;

    let text;
    switch (s) {
        case STATE_IDLE:     text = t('control.status.idle'); break;
        case STATE_STARTING: text = t('control.status.starting'); break;
        case STATE_RUNNING:
            text = t('control.status.running');
            if (status.port) text += ' · :' + status.port;
            break;
        case STATE_STOPPING: text = t('control.status.stopping'); break;
        case STATE_STOPPED:  text = t('control.status.stopped'); break;
        case STATE_ERROR:    text = t('control.status.error', { reason: (status.lastError || '').slice(0, 80) }); break;
        default:             text = s;
    }
    textEl.textContent = text;
}

// ---------- Server meta ----------
let headerClockTimer = null;
export function updateServerMeta(status) {
    const portEl = document.getElementById('meta-port');
    const pidEl  = document.getElementById('meta-pid');
    portEl.textContent = status && status.port ? String(status.port) : '—';
    pidEl.textContent  = status && status.pid  ? String(status.pid)  : '—';
    // uptime 由 initHeaderClock 定時刷新
}

export function initHeaderClock(getServer) {
    if (headerClockTimer) clearInterval(headerClockTimer);
    const uptimeEl = document.getElementById('meta-uptime');
    headerClockTimer = setInterval(() => {
        const s = getServer();
        if (!s || !s.startedAt || s.state !== STATE_RUNNING) {
            uptimeEl.textContent = '—';
            return;
        }
        const ms = Date.now() - s.startedAt;
        uptimeEl.textContent = formatUptime(ms);
    }, 1000);
}

function formatUptime(ms) {
    if (ms < 0) ms = 0;
    const s = Math.floor(ms / 1000);
    const hh = String(Math.floor(s / 3600)).padStart(2, '0');
    const mm = String(Math.floor((s % 3600) / 60)).padStart(2, '0');
    const ss = String(s % 60).padStart(2, '0');
    return `${hh}:${mm}:${ss}`;
}

// ---------- Primary controls enable/disable ----------
export function updatePrimaryControls(status) {
    const s = status && status.state;
    const openBtn = document.getElementById('btn-open-browser');
    const startBtn = document.getElementById('btn-start');
    const manageBtn = document.getElementById('btn-manage');
    const miStop = document.getElementById('mi-stop');
    const miRestart = document.getElementById('mi-restart');

    openBtn.disabled  = s !== STATE_RUNNING;
    startBtn.disabled = !(s === STATE_STOPPED || s === STATE_IDLE || s === STATE_ERROR);
    manageBtn.disabled = !(s === STATE_RUNNING || s === STATE_ERROR);
    miStop.disabled    = s !== STATE_RUNNING;
    miRestart.disabled = !(s === STATE_RUNNING || s === STATE_ERROR);
}

// ---------- Error banner ----------
export function showErrorBanner(errorMsg) {
    const banner = document.getElementById('error-banner');
    const desc = document.getElementById('banner-desc');
    desc.textContent = errorMsg || '';
    banner.removeAttribute('hidden');
}

export function hideErrorBanner() {
    const banner = document.getElementById('error-banner');
    banner.setAttribute('hidden', '');
}

// ---------- Primary CTA pulse（引導使用者點擊 Open in Browser） ----------
// 對齊 Design Spec v2.1 startup-progress.md §4.1（stage 6 manual hint mode）
// 於 stage 5 skipped 時由 app.js 主動開啟，成功建立 WS 連線或 panel 關閉時取消
export function setPrimaryCTAPulse(enabled) {
    const openBtn = document.getElementById('btn-open-browser');
    if (!openBtn) return;
    if (enabled) {
        openBtn.classList.add('pulse-cta');
    } else {
        openBtn.classList.remove('pulse-cta');
    }
}

// ---------- Toast ----------
let toastTimer = null;
export function showToast(message, duration = 3000) {
    const el = document.getElementById('toast');
    if (!el) return;
    el.textContent = message;
    el.removeAttribute('hidden');
    if (toastTimer) clearTimeout(toastTimer);
    toastTimer = setTimeout(() => {
        el.setAttribute('hidden', '');
    }, duration);
}