(function () {
    const REMEMBER_KEY = '_cy_remember';
    const OBFUSCATE_KEY = 'cydd2024';

    function obfuscate(str) {
        let result = '';
        for (let i = 0; i < str.length; i++) {
            result += String.fromCharCode(str.charCodeAt(i) ^ OBFUSCATE_KEY.charCodeAt(i % OBFUSCATE_KEY.length));
        }
        return btoa(unescape(encodeURIComponent(result)));
    }

    function deobfuscate(encoded) {
        try {
            const str = decodeURIComponent(escape(atob(encoded)));
            let result = '';
            for (let i = 0; i < str.length; i++) {
                result += String.fromCharCode(str.charCodeAt(i) ^ OBFUSCATE_KEY.charCodeAt(i % OBFUSCATE_KEY.length));
            }
            return result;
        } catch (e) { return null; }
    }

    function saveWebCredentials(username, password) {
        try {
            localStorage.setItem(REMEMBER_KEY, obfuscate(JSON.stringify({ u: username, p: password, t: Date.now() })));
        } catch (e) {}
    }

    function loadWebCredentials() {
        try {
            const encoded = localStorage.getItem(REMEMBER_KEY);
            if (!encoded) return null;
            const json = deobfuscate(encoded);
            if (!json) return null;
            const data = JSON.parse(json);
            if (data.u && data.p) return data;
        } catch (e) {}
        return null;
    }

    function clearWebCredentials() {
        try { localStorage.removeItem(REMEMBER_KEY); } catch (e) {}
    }

    window.CredentialStore = {
        saveWebCredentials,
        loadWebCredentials,
        clearWebCredentials,

        async loadSavedLogin({ getOfflineData }) {
            if (window.MobilePlatform?.isNativeApp?.()) {
                return await getOfflineData('_saved_login');
            }
            return loadWebCredentials();
        },

        async hasSavedLogin() {
            if (window.MobilePlatform?.isNativeApp?.()) {
                const saved = window.OfflineStore?.cache?.get('_saved_login');
                return !!(saved && saved.username);
            }
            const saved = loadWebCredentials();
            return !!(saved && saved.username);
        },

        async saveSavedLogin({ rememberMe, username, password, saveOfflineData, clearSavedLogin }) {
            if (window.MobilePlatform?.isNativeApp?.()) {
                if (rememberMe) {
                    await saveOfflineData('_saved_login', { username, password });
                } else {
                    await clearSavedLogin();
                }
                return;
            }

            if (rememberMe) {
                saveWebCredentials(username, password);
            } else {
                clearSavedLogin();
            }
        },

        async clearSavedLogin({ openOfflineDB } = {}) {
            if (window.MobilePlatform?.isNativeApp?.()) {
                window.OfflineStore?.cache?.delete('_saved_login');
                try {
                    const db = await openOfflineDB();
                    const tx = db.transaction('data', 'readwrite');
                    tx.objectStore('data').delete('_saved_login');
                } catch (e) {}
                return;
            }
            clearWebCredentials();
        }
    };
})();