(function() {
    'use strict';

    window.MediaGatewayUtils = {
        formatTime(ts) {
            const d = new Date(ts * 1000);
            return d.toLocaleTimeString('ja-JP', {
                timeZone: 'Asia/Tokyo',
                hour: '2-digit',
                minute: '2-digit',
                hour12: false
            });
        },

        formatDate(ts) {
            const d = new Date(ts * 1000);
            return d.toLocaleDateString('ja-JP', {
                timeZone: 'Asia/Tokyo',
                year: 'numeric',
                month: '2-digit',
                day: '2-digit'
            }).replace(/\//g, '-');
        },

        formatDuration(sec) {
            const h = Math.floor(sec / 3600);
            const m = Math.floor((sec % 3600) / 60);
            return h > 0 ? `${h}小时${m}分钟` : `${m}分钟`;
        },

        formatBytes(b) {
            if (b === 0) return '0 B';
            const k = 1024;
            const sizes = ['B', 'KB', 'MB', 'GB'];
            const i = Math.floor(Math.log(b) / Math.log(k));
            return (b / Math.pow(k, i)).toFixed(2) + ' ' + sizes[i];
        },

        getJSTDate(d) {
            if (!d) d = new Date();
            const jst = new Date(d.toLocaleString('en-US', { timeZone: 'Asia/Tokyo' }));
            return jst.toISOString().split('T')[0];
        },

        showNotification(msg, type = 'info') {
            const old = document.querySelector('.notification');
            if (old) old.remove();

            const n = document.createElement('div');
            n.className = `notification notification-${type}`;
            n.textContent = msg;
            document.body.appendChild(n);
            
            setTimeout(() => n.remove(), 3000);
        },

        async checkAPIStatus() {
            try {
                const start = Date.now();
                const res = await fetch('/health');
                const time = Date.now() - start;
                const data = await res.json();
                
                return {
                    success: true,
                    status: data.status,
                    responseTime: time,
                    data: data
                };
            } catch (e) {
                return {
                    success: false,
                    error: e.message
                };
            }
        }
    };
})();