(function () {
    const isCapacitorApp = !!(window.Capacitor && window.Capacitor.isNativePlatform && window.Capacitor.isNativePlatform());
    const platform = isCapacitorApp && window.Capacitor?.getPlatform ? window.Capacitor.getPlatform() : 'web';

    // Server endpoints
    const MASTER_URL = 'http://122.51.80.140:5000';
    const SLAVE_URL = 'https://chaofenghui-short-track.hf.space';
    const PING_TIMEOUT = 3000;
    const PREFERENCE_CACHE_KEY = 'server_preference_v1';
    const PREFERENCE_CACHE_TTL = 60 * 60 * 1000; // 1 hour

    const DEFAULT_SYNC_INTERVAL = 7 * 24 * 60 * 60 * 1000;
    const MATCH_DAY_SYNC_INTERVAL = 5 * 60 * 1000;

    // Active API bases — set asynchronously on startup
    // For Capacitor, always use MASTER_URL to avoid SameSite cookie issues.
    // Fetch interceptor (installed on 'load') routes writes to master anyway,
    // so using MASTER_URL for reads is safe and simpler.
    let _readApiBase = isCapacitorApp ? MASTER_URL : '';
    let _readApiBaseReady = !isCapacitorApp; // web不需要异步选择

    function getApiBase() {
        return _readApiBase;
    }

    function isReadApiBaseReady() {
        return _readApiBaseReady;
    }

    function isHfSpace() {
        try { return window.location.hostname.includes('hf.space'); } catch (_) { return false; }
    }

    function getWriteApiBase() {
        if (isCapacitorApp) return MASTER_URL;
        if (isHfSpace()) return MASTER_URL;
        return '';
    }

    function getCachedServerPreference() {
        try {
            const raw = localStorage.getItem(PREFERENCE_CACHE_KEY);
            if (!raw) return null;
            const entry = JSON.parse(raw);
            if (Date.now() - entry.timestamp < PREFERENCE_CACHE_TTL) {
                return entry.server;
            }
        } catch (_) {}
        return null;
    }

    function cacheServerPreference(serverUrl) {
        try {
            localStorage.setItem(PREFERENCE_CACHE_KEY, JSON.stringify({
                server: serverUrl,
                timestamp: Date.now()
            }));
        } catch (_) {}
    }

    async function selectFastestServer() {
        if (!isCapacitorApp) return '';

        // Return cached preference if still valid
        const cached = getCachedServerPreference();
        if (cached) return cached;

        const candidates = [
            { url: MASTER_URL, label: 'master' },
            { url: SLAVE_URL, label: 'slave' }
        ];

        const results = await Promise.allSettled(
            candidates.map(async (c) => {
                const start = performance.now();
                const controller = new AbortController();
                const timeoutId = setTimeout(() => controller.abort(), PING_TIMEOUT);
                try {
                    const resp = await fetch(c.url + '/api/ping', {
                        method: 'GET',
                        signal: controller.signal
                    });
                    clearTimeout(timeoutId);
                    const latency = performance.now() - start;
                    if (resp.ok) {
                        return { url: c.url, latency, label: c.label };
                    }
                    throw new Error('non-ok: ' + resp.status);
                } catch (e) {
                    clearTimeout(timeoutId);
                    throw e;
                }
            })
        );

        let best = null;
        for (const r of results) {
            if (r.status === 'fulfilled') {
                if (!best || r.value.latency < best.latency) {
                    best = r.value;
                }
            }
        }

        const selected = best ? best.url : MASTER_URL;
        cacheServerPreference(selected);
        console.log('[MobilePlatform] Selected server:', best ? best.label : 'fallback-master',
            best ? Math.round(best.latency) + 'ms' : '');
        return selected;
    }

    async function getReadApiBase() {
        if (!isCapacitorApp) return '';
        if (!_readApiBaseReady) {
            // Always use MASTER_URL for Capacitor to avoid SameSite cookie issues.
            // selectFastestServer() is kept for future re-enablement.
            _readApiBase = MASTER_URL;
            _readApiBaseReady = true;
        }
        return _readApiBase;
    }

    function getServerPreference() {
        return {
            readBase: _readApiBase,
            writeBase: getWriteApiBase(),
            ready: _readApiBaseReady,
            isCapacitorApp: isCapacitorApp,
            isHfSpace: isHfSpace()
        };
    }

    function getPlatform() {
        return platform;
    }

    function isNativeApp() {
        return isCapacitorApp;
    }

    function isIOS() {
        return platform === 'ios';
    }

    function isAndroid() {
        return platform === 'android';
    }

    // ========== Fetch Interceptor (DISABLED) ==========
    // Removed: the interceptor saved window.fetch before CapacitorHttp patched it,
    // causing all requests to bypass native HTTP and lose cookies (SameSite=Lax).
    // Instead, Capacitor always uses MASTER_URL for both reads and writes.
    // To re-enable fastest-server selection, the interceptor must be installed
    // after the 'load' event when CapacitorHttp has already patched fetch.

    // ========== PWA / Native ==========

    async function openExternalUrl(url) {
        if (isCapacitorApp && window.Capacitor?.Plugins?.Browser) {
            try {
                await window.Capacitor.Plugins.Browser.open({ url });
                return;
            } catch (e) {}
        }
        window.open(url, '_blank', 'noopener');
    }

    function configureStatusBar(theme) {
        if (!isCapacitorApp || !window.Capacitor?.Plugins?.StatusBar) return;
        try {
            var st = window.Capacitor.Plugins.StatusBar;
            // Overlay mode: WebView draws behind status bar, env(safe-area-inset-top) works
            st.setOverlaysWebView({ overlay: true }).catch(function() {});
            st.setBackgroundColor({
                color: theme === 'dark' ? '#0B1426' : '#0F4C81'
            });
        } catch (e) {}
    }

    function registerBackHandler(handler) {
        if (!isCapacitorApp || !window.Capacitor?.Plugins?.App || typeof handler !== 'function') return;
        window.Capacitor.Plugins.App.addListener('backButton', handler);
    }

    function applyServiceWorkerPolicy() {
        if (!('serviceWorker' in navigator)) return;
        if (!isCapacitorApp) {
            navigator.serviceWorker.register('/sw.js').then(function(reg) {
                // When a new SW takes over, reload to get latest code
                var refreshing = false;
                navigator.serviceWorker.addEventListener('controllerchange', function() {
                    if (refreshing) return;
                    refreshing = true;
                    window.location.reload();
                });
                // If a new SW is already waiting, signal it to activate
                if (reg.waiting) {
                    reg.waiting.postMessage('skipWaiting');
                }
                reg.addEventListener('updatefound', function() {
                    var newWorker = reg.installing;
                    if (!newWorker) return;
                    newWorker.addEventListener('statechange', function() {
                        if (newWorker.state === 'installed' && navigator.serviceWorker.controller) {
                            // New SW installed and waiting — tell it to activate immediately
                            newWorker.postMessage('skipWaiting');
                        }
                    });
                });
            }).catch(function(err) { console.log('SW registration failed:', err); });
            return;
        }
        navigator.serviceWorker.getRegistrations().then(function(regs) { return regs.forEach(function(r) { return r.unregister(); }); });
    }

    function buildAbsoluteUrl(path) {
        if (!path) return '';
        if (/^https?:\/\//.test(path)) return path;
        if (!path.startsWith('/')) return `${_readApiBase}/${path}`;
        return `${_readApiBase}${path}`;
    }

    function isVisibleForSync() {
        return !document.hidden;
    }

    function isReadyForSync(currentUser, isOnline) {
        return !!currentUser && isOnline();
    }

    function isMatchDay(currentMatches) {
        if (!Array.isArray(currentMatches) || currentMatches.length === 0) return false;
        const today = new Date().toISOString().slice(0, 10).replace(/-/g, '/');
        return currentMatches.some(m => {
            const dr = m.date_range || '';
            const parts = dr.split('—');
            if (parts.length === 2) {
                const start = parts[0].trim().replace(/\//g, '-');
                const end = parts[1].trim().replace(/\//g, '-');
                return today >= start && today <= end;
            }
            return dr.includes(today.replace(/-/g, '/'));
        });
    }

    function getSyncInterval(currentMatches) {
        return isMatchDay(currentMatches) ? MATCH_DAY_SYNC_INTERVAL : DEFAULT_SYNC_INTERVAL;
    }

    function shouldSyncNow(lastSyncTime, currentMatches) {
        return Date.now() - lastSyncTime >= getSyncInterval(currentMatches);
    }

    function shouldUseEmbeddedData() {
        return isCapacitorApp;
    }

    function shouldStartNativeSync() {
        return isCapacitorApp;
    }

    function getRuntimeVersion() {
        return window.__APP_VERSION__ || localStorage.getItem('app_version') || 'Web版';
    }

    function getSettingsVersionLabel() {
        const ver = getRuntimeVersion();
        return isCapacitorApp ? `v${ver}` : 'Web版';
    }

    function getMobileUpdateInfo(versionData) {
        const platforms = versionData?.platforms || {};
        if (isAndroid()) {
            return platforms.android || { available: false, primary_action: null };
        }
        if (isIOS()) {
            return platforms.ios || { available: false, primary_action: null };
        }
        return platforms.android || platforms.web || { available: false, primary_action: null };
    }

    function shouldShowNativeUpdate(updateVersion, effectiveLocalVersion, updateInfo, isNewerVersion) {
        return isCapacitorApp && !!updateInfo?.primary_action && isNewerVersion(updateVersion, effectiveLocalVersion);
    }

    function shouldPersistInstalledVersion() {
        return isCapacitorApp && !!window.__APP_VERSION__;
    }

    function shouldCheckNativeUpdate() {
        return isCapacitorApp;
    }

    function getWebUpdateCheckMessage() {
        return '网页版无需检查更新';
    }

    function shouldResyncAfterCacheClear(currentUser) {
        return isCapacitorApp && !!currentUser;
    }

    function shouldCacheApiResponses() {
        return isCapacitorApp;
    }

    function shouldUseOfflineFallback() {
        return isCapacitorApp;
    }

    function getUpdatePrimaryLabel() {
        return isIOS() ? '查看分发方式' : '立即更新';
    }

    function getUpdateDescription() {
        return isIOS() ? 'iOS 新版本已准备，请按分发方式更新' : '有新版本可用，建议更新以获得最新数据';
    }

    function getInstallTitle() {
        return isIOS() ? '📱 iOS 安装' : '📱 Android 安装';
    }

    function createInstallAction(action, version) {
        if (isIOS()) {
            return {
                href: 'javascript:void(0)',
                download: false,
                label: action?.label || '请通过 TestFlight / Xcode 分发',
                meta: action?.min_os || 'iOS',
                onClick(event) {
                    event?.preventDefault?.();
                    const message = action?.label || '当前 iOS 版本请通过 TestFlight / Xcode 分发';
                    window.showToast?.(message, 'success');
                    return false;
                }
            };
        }

        if (action?.url) {
            const absoluteUrl = buildAbsoluteUrl(action.url);
            return {
                href: action.url,
                download: true,
                label: action.label || '立即下载 Android 安装包',
                meta: action?.min_os || 'Android',
                onClick(event) {
                    if (!isCapacitorApp) return true;
                    event?.preventDefault?.();
                    openExternalUrl(absoluteUrl);
                    return false;
                }
            };
        }

        return {
            href: 'javascript:void(0)',
            download: false,
            label: '安装包暂未上传',
            meta: action?.min_os || 'Android',
            onClick(event) {
                event?.preventDefault?.();
                window.showToast?.('安装包暂未上传', 'error');
                return false;
            }
        };
    }

    function createUpdateToastAction(action, version) {
        if (isIOS()) {
            return {
                label: getUpdatePrimaryLabel(),
                run(toastEl) {
                    window.showToast?.(action?.label || '请通过 TestFlight / Xcode 分发');
                    toastEl?.remove();
                }
            };
        }

        return {
            label: getUpdatePrimaryLabel(),
            run(toastEl) {
                localStorage.setItem('installed_version', version);
                toastEl?.remove();
                if (action?.url) {
                    openExternalUrl(buildAbsoluteUrl(action.url));
                } else {
                    window.showToast?.('安装包暂未上传', 'error');
                }
            }
        };
    }

    window.MobilePlatform = {
        isCapacitorApp,
        isNativeApp,
        isIOS,
        isAndroid,
        getPlatform,
        getApiBase,
        getReadApiBase,
        getWriteApiBase,
        isReadApiBaseReady,
        selectFastestServer,
        getServerPreference,
        isHfSpace,
        openExternalUrl,
        configureStatusBar,
        registerBackHandler,
        applyServiceWorkerPolicy,
        buildAbsoluteUrl,
        isVisibleForSync,
        isReadyForSync,
        isMatchDay,
        getSyncInterval,
        shouldSyncNow,
        shouldUseEmbeddedData,
        shouldStartNativeSync,
        getRuntimeVersion,
        getSettingsVersionLabel,
        getMobileUpdateInfo,
        shouldShowNativeUpdate,
        shouldPersistInstalledVersion,
        shouldCheckNativeUpdate,
        getWebUpdateCheckMessage,
        shouldResyncAfterCacheClear,
        shouldCacheApiResponses,
        shouldUseOfflineFallback,
        getUpdatePrimaryLabel,
        getUpdateDescription,
        getInstallTitle,
        createInstallAction,
        createUpdateToastAction,
    };
})();