// visionA-local 控制台 main entry
// - 負責 bindings / events 註冊、初始化 UI
// - M8-5 Wails 控制台 UI（對齊 Design Spec v2.1）

import {
    StartServer,
    StopServer,
    RestartServer,
    ForceKillServer,
    GetServerStatusV2,
    GetStartupSnapshot,
    GetRecentLogs,
    ClearLogs,
    GetSystemInfo,
    OpenInBrowser,
    RevealLogsFolder,
    ExportLog,
    GetPreferences,
    SetPreferences,
    RestartStartupSequence,
} from './wailsjs/go/main/App.js';

import { EventsOn } from './wailsjs/runtime/runtime.js';
import { t, applyI18n, setLocale, getLocale, detectLocale, LOCALES } from './i18n.js';
import {
    setServerState,
    updateServerMeta,
    updatePrimaryControls,
    showErrorBanner,
    hideErrorBanner,
    showToast,
    initHeaderClock,
    setPrimaryCTAPulse,
    STATE_ERROR,
} from './control-panel.js';
import {
    showStartupPanel,
    hideStartupPanel,
    collapseStartupPanel,
    expandStartupPanel,
    resetStartupPanel,
    updateStage,
    updateStageDetail,
    markStageTimeout,
    showStartupError,
    renderStages,
    onManualModeChange,
} from './startup-panel.js';
import {
    initLogPanel,
    appendLogs,
    clearLog,
    flashLastError,
    applyLogFilter,
} from './log-panel.js';
import { initSettingsPanel, openSettings } from './settings-panel.js';

// ---------- 全域狀態 ----------
const state = {
    server: null,      // ServerStatusV2
    prefs: null,       // Preferences
    sysInfo: null,     // SystemInfo
    starting: false,   // 啟動進度面板是否顯示
};

// ---------- 初始化 ----------
async function init() {
    // 1. 讀 preferences → 決定 locale
    try {
        state.prefs = await GetPreferences();
    } catch (e) {
        console.warn('GetPreferences failed:', e);
        state.prefs = { autoOpenBrowser: true, locale: '' };
    }
    const locale = detectLocale(state.prefs && state.prefs.locale);
    setLocale(locale);

    // 2. 讀系統資訊
    try {
        state.sysInfo = await GetSystemInfo();
    } catch (e) {
        console.warn('GetSystemInfo failed:', e);
    }

    // 3. 套 i18n 到 DOM
    applyI18n();
    document.title = t('control.title');
    if (state.sysInfo && state.sysInfo.appVersion) {
        document.getElementById('app-version').textContent = state.sysInfo.appVersion;
    }

    // 4. render 6 階段 UI skeleton
    renderStages();

    // 5. 初始化 log panel（拉既有 buffer）
    try {
        const existingLogs = await GetRecentLogs(2000);
        initLogPanel(existingLogs || []);
    } catch (e) {
        console.warn('GetRecentLogs failed:', e);
        initLogPanel([]);
    }

    // 6. 綁按鈕 handlers
    bindHandlers();

    // 7. 訂閱 Wails events
    subscribeEvents();

    // 7.5. 補上前端 init 完成前 Go 端已 emit 但被丟掉的 startup events。
    //      Wails Webview JS load 完成需 1-3 秒（Windows 乾淨環境更慢），這段
    //      期間 Go 的 Pipeline.Start 已經跑完 emit Stage 1 running、可能也
    //      跑完 Stage 1 complete + Stage 2 running 等多個 events，前端 EventsOn
    //      還沒掛上去就被丟掉。拉一次 snapshot 把這些 stage 狀態補回來，
    //      避免 UI 顯示「Stage 1 等待中、Stage 2 完成」這種亂序畫面。
    try {
        const snapshot = await GetStartupSnapshot();
        if (snapshot && snapshot.current > 0) {
            // pipeline 還在進行中或已完成 → 顯示 panel + 用 monotonic 模式
            // 補上各 stage 狀態（已收到較新狀態的 stage 不會被倒退）
            state.starting = true;
            showStartupPanel();
            for (const s of snapshot.stages || []) {
                updateStage(
                    { stage: s.stage, status: s.status, startedAt: s.startedAt },
                    { monotonic: true },
                );
            }
            // 已 ready (current=7) → 直接 collapse 面板
            if (snapshot.current > snapshot.totalStages) {
                state.starting = false;
                collapseStartupPanel();
            }
        }
    } catch (e) {
        console.warn('GetStartupSnapshot failed:', e);
    }

    // 8. 初始 state query
    try {
        const status = await GetServerStatusV2();
        handleServerStatus(status);
    } catch (e) {
        console.warn('GetServerStatusV2 failed:', e);
    }

    // 9. 初始化 settings panel
    initSettingsPanel({
        prefs: state.prefs,
        sysInfo: state.sysInfo,
        getPreferences: GetPreferences,
        setPreferences: SetPreferences,
        onLocaleChange: (newLoc) => {
            setLocale(newLoc || detectLocale(''));
            applyI18n();
            document.title = t('control.title');
            renderStages();
            // re-render current state text
            if (state.server) setServerState(state.server);
        },
    });

    // 10. header uptime 時鐘
    initHeaderClock(() => state.server);

    // 11. Manual mode 監聽：stage 5 skipped 時引導使用者點 Open in Browser
    //    對齊 Design Spec §4.1
    onManualModeChange((enabled) => {
        setPrimaryCTAPulse(enabled);
    });
}

// ---------- 處理 server status ----------
function handleServerStatus(status) {
    if (!status) return;
    state.server = status;
    setServerState(status);
    updateServerMeta(status);
    updatePrimaryControls(status);

    // Error state runtime banner（非 startup error）
    if (status.state === STATE_ERROR && status.lastError && !state.starting) {
        showErrorBanner(status.lastError);
    } else if (status.state !== STATE_ERROR) {
        hideErrorBanner();
    }
}

// ---------- 按鈕 handlers ----------
function bindHandlers() {
    const $ = (id) => document.getElementById(id);

    // Open in Browser
    $('btn-open-browser').addEventListener('click', async () => {
        try {
            await OpenInBrowser('');
        } catch (e) {
            showToast('Failed to open browser: ' + e);
        }
    });

    // Start
    $('btn-start').addEventListener('click', async () => {
        try {
            await StartServer();
        } catch (e) {
            showToast('Start failed: ' + e);
        }
    });

    // Manage menu
    const manageBtn = $('btn-manage');
    const manageMenu = $('manage-menu');
    manageBtn.addEventListener('click', (ev) => {
        ev.stopPropagation();
        const hidden = manageMenu.hasAttribute('hidden');
        if (hidden) {
            manageMenu.removeAttribute('hidden');
            manageBtn.setAttribute('aria-expanded', 'true');
        } else {
            manageMenu.setAttribute('hidden', '');
            manageBtn.setAttribute('aria-expanded', 'false');
        }
    });
    document.addEventListener('click', () => {
        if (!manageMenu.hasAttribute('hidden')) {
            manageMenu.setAttribute('hidden', '');
            manageBtn.setAttribute('aria-expanded', 'false');
        }
    });

    $('mi-stop').addEventListener('click', async () => {
        try {
            await StopServer();
        } catch (e) {
            showToast('Stop failed: ' + e);
        }
    });
    $('mi-restart').addEventListener('click', async () => {
        try {
            resetStartupPanel();
            await RestartServer();
        } catch (e) {
            showToast('Restart failed: ' + e);
        }
    });
    $('mi-open-folder').addEventListener('click', async () => {
        try {
            await RevealLogsFolder();
        } catch (e) {
            showToast('Open folder failed: ' + e);
        }
    });

    // Log actions
    $('btn-clear-log').addEventListener('click', async () => {
        try {
            await ClearLogs();
            clearLog();
            showToast(t('control.log.clearToast'));
        } catch (e) {
            showToast('Clear failed: ' + e);
        }
    });
    $('btn-copy-log').addEventListener('click', async () => {
        const output = document.getElementById('log-output');
        try {
            await navigator.clipboard.writeText(output.innerText || '');
            showToast(t('control.log.copied'));
        } catch (e) {
            showToast('Copy failed: ' + e);
        }
    });
    $('btn-export-log').addEventListener('click', async () => {
        try {
            const path = await ExportLog();
            showToast(t('control.log.exported', { path }));
        } catch (e) {
            showToast('Export failed: ' + e);
        }
    });
    $('btn-open-folder').addEventListener('click', async () => {
        try {
            await RevealLogsFolder();
        } catch (e) {
            showToast('Open folder failed: ' + e);
        }
    });

    // Filter
    $('filter-input').addEventListener('input', (e) => applyLogFilter({ text: e.target.value }));
    $('level-filter').addEventListener('change', (e) => applyLogFilter({ level: e.target.value }));

    // Settings
    $('btn-settings').addEventListener('click', openSettings);

    // Startup panel collapsed bar：點任何位置都展開（看歷史紀錄）
    const startupPanelEl = $('startup-panel');
    if (startupPanelEl) {
        startupPanelEl.addEventListener('click', () => {
            if (startupPanelEl.getAttribute('data-collapsed') === 'true') {
                expandStartupPanel();
            }
        });
    }

    // Startup error actions — Retry 會把面板重置展開
    $('btn-retry').addEventListener('click', async () => {
        try {
            resetStartupPanel();
            await RestartStartupSequence();
        } catch (e) {
            showToast('Retry failed: ' + e);
        }
    });
    $('btn-view-log').addEventListener('click', () => {
        hideStartupPanel();
        flashLastError();
    });
    // Report 按鈕 disabled（coming soon）

    // Error banner — Restart Server 會重置展開（讓使用者看新一輪 6 階段）
    $('banner-restart').addEventListener('click', async () => {
        try {
            resetStartupPanel();
            await RestartServer();
        } catch (e) {
            showToast('Restart failed: ' + e);
        }
    });
    $('banner-view').addEventListener('click', () => {
        flashLastError();
    });

    // 鍵盤快捷鍵：⌘F / Ctrl+F focus filter
    document.addEventListener('keydown', (e) => {
        if ((e.metaKey || e.ctrlKey) && e.key === 'f') {
            e.preventDefault();
            $('filter-input').focus();
        }
    });
}

// ---------- 訂閱 Wails events ----------
function subscribeEvents() {
    // server state / error / recovered
    EventsOn('server:state-change', (payload) => handleServerStatus(payload));
    EventsOn('server:error', (payload) => {
        // Go 端 server_control.go L184/L361 emit payload key 為 "reason"（不是 "error"）
        if (payload && payload.reason) showErrorBanner(payload.reason);
    });
    EventsOn('server:recovered', () => {
        hideErrorBanner();
        showToast('Server recovered');
    });

    // log stream
    EventsOn('log:append', (entries) => {
        if (Array.isArray(entries)) appendLogs(entries);
        else if (entries) appendLogs([entries]);
    });
    EventsOn('log:clear', () => clearLog());

    // startup pipeline
    EventsOn('startup:progress', (ev) => {
        if (!state.starting) {
            state.starting = true;
            showStartupPanel();
        }
        updateStage(ev);
    });
    EventsOn('startup:stage-timeout', (ev) => {
        markStageTimeout(ev);
    });
    // Stage 細步 detail（例如 Stage 3 的 spawn / waitHealth / waitHealthSlow）
    EventsOn('startup:stage-detail', (ev) => {
        updateStageDetail(ev);
    });
    EventsOn('startup:error', (ev) => {
        showStartupError(ev);
    });
    EventsOn('startup:ready', () => {
        state.starting = false;
        collapseStartupPanel();
    });

    // shutdown modal（M8-4 1 秒後顯示）
    // 用 watchdog 做 safety net：popup show 後最多顯示 15 秒，即使 Go 端
    // 沒 emit hide（stopGraceful 卡死、Process.Wait 阻塞等邊界情境）前端也
    // 會自己 hide，避免使用者卡在無法關閉的 popup。
    let shutdownModalWatchdog = null;
    const hideShutdownModal = () => {
        const m = document.getElementById('shutdown-modal');
        if (m) m.setAttribute('hidden', '');
        if (shutdownModalWatchdog) {
            clearTimeout(shutdownModalWatchdog);
            shutdownModalWatchdog = null;
        }
    };
    EventsOn('shutdown:modal-show', () => {
        const m = document.getElementById('shutdown-modal');
        if (m) m.removeAttribute('hidden');
        if (shutdownModalWatchdog) clearTimeout(shutdownModalWatchdog);
        shutdownModalWatchdog = setTimeout(() => {
            hideShutdownModal();
            showToast('伺服器停止耗時過久，popup 已自動關閉。請用工作管理員確認 server 是否已結束。');
        }, 15000);
    });
    // stopGraceful 結束時對稱 hide。
    EventsOn('shutdown:modal-hide', hideShutdownModal);
    // 點 backdrop 空白處可手動關閉 popup（Escape hatch）
    const shutdownBackdrop = document.getElementById('shutdown-modal');
    if (shutdownBackdrop) {
        shutdownBackdrop.addEventListener('click', (e) => {
            if (e.target === shutdownBackdrop) hideShutdownModal();
        });
    }
    // Esc 鍵也可以關
    document.addEventListener('keydown', (e) => {
        if (e.key === 'Escape') {
            const m = document.getElementById('shutdown-modal');
            if (m && !m.hasAttribute('hidden')) hideShutdownModal();
        }
    });

    // app level fatal（保留相容）
    EventsOn('app:error', (msg) => {
        showErrorBanner(typeof msg === 'string' ? msg : JSON.stringify(msg));
    });
}

// ---------- 啟動 ----------
if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', init);
} else {
    init();
}