/* ── 数字跳动动画 ── */
function animateNumber(el, newVal, decimals, suffix) {
  var oldVal = parseFloat(el.getAttribute('data-val') || newVal);
  if (oldVal === newVal) { el.textContent = newVal.toFixed(decimals) + suffix; return; }
  el.setAttribute('data-val', newVal);
  var start = performance.now();
  var duration = 900;
  function step(ts) {
    var p = Math.min((ts - start) / duration, 1);
    var eased = 1 - Math.pow(1 - p, 3); // ease-out
    el.textContent = (oldVal + (newVal - oldVal) * eased).toFixed(decimals) + suffix;
    if (p < 1) requestAnimationFrame(step);
  }
  requestAnimationFrame(step);
}

window.DashboardModule = {
    ws: null,
    reconnectTimer: null,
    reconnectDelay: 1000,
    charts: {},

    init: function() {
        var self = this;

        // 初始化图表
        self.charts = {
            mem:   new MiniChart('chart-mem', '#9ece6a'),
            cpu:   new MiniChart('chart-cpu', '#7aa2f7'),
            net:   new MiniChart('chart-net', '#e0af68'),
            speed: new DualLineChart('chart-speed', '#bb9af7', '#c0a8f0'),
            proc_mem: new MiniChart('chart-proc-mem', '#f7768e')
        };

        // 静态信息 (HTTP 一次)
        fetchSystemStaticInfo();

        // WebSocket 实时推送
        self._connect();
    },

    _connect: function() {
        var self = this;
        if (self.ws) {
            self.ws.onclose = null;
            self.ws.close();
            self.ws = null;
        }

        var base = window.location.pathname.split("/").slice(0, 2).join("/");
        var ws = new WebSocket("ws://" + location.host + base + "/api/system/ws");
        self.ws = ws;

        ws.onopen = function() {
            self.reconnectDelay = 1000;
        };

        ws.onmessage = function(e) {
            try {
                var d = JSON.parse(e.data);
                if (d.type === "sys") {
                    self._updateUI(d.system, d.framework);
                }
            } catch(ex) {}
        };

        ws.onclose = function() {
            self.ws = null;
            self.reconnectTimer = setTimeout(function() {
                self.reconnectDelay = Math.min(self.reconnectDelay * 1.5, 15000);
                self._connect();
            }, self.reconnectDelay);
        };

        ws.onerror = function() { ws.close(); };
    },

    _updateUI: function(sys, fw) {
        // ── 框架卡片 ──
        if (fw) {
            var el;
            el = document.getElementById('d-uptime');   if (el) el.textContent = formatUptime(fw.uptime || 0);
            el = document.getElementById('d-plugins');  if (el) el.textContent = fw.plugins || 0;
            el = document.getElementById('d-ver-badge'); if (el) el.textContent = fw.version || '?';
        }
        if (!sys) return;
        var self = this;

        // ── 内存 ──
        if (sys.memory) {
            var m = sys.memory.percent || 0;
            var el = document.getElementById('d-mem'); if (el) animateNumber(el, m, 1, '%');
            el = document.getElementById('d-mem-detail');
            if (el) el.textContent = (sys.memory.used_gb || 0).toFixed(1) + ' / ' + (sys.memory.total_gb || 0).toFixed(1) + ' GB';
            self.charts.mem.update(m);
        }

        // ── CPU ──
        if (sys.cpu) {
            var cpuVal = sys.cpu.percent;
            if (cpuVal === null || cpuVal === undefined) {
                var load = (sys.cpu.load_avg && sys.cpu.load_avg[0]) ? sys.cpu.load_avg[0] : 0;
                cpuVal = Math.min(100, (load / (sys.cpu.cores || 1)) * 100);
            }
            var el = document.getElementById('d-cpu'); if (el) animateNumber(el, cpuVal, 0, '%');
            self.charts.cpu.update(cpuVal);

            if (sys.cpu.load_avg) {
                el = document.getElementById('info-load'); if (el) el.textContent = sys.cpu.load_avg[2].toFixed(2);
            }
        }

        // ── 网络累计流量 (RX + TX) ──
        if (sys.network) {
            var el;
            el = document.getElementById('d-net-rx'); if (el) el.textContent = formatTraffic(sys.network.rx_mb);
            el = document.getElementById('d-net-tx'); if (el) el.textContent = formatTraffic(sys.network.tx_mb);
            // Chart shows RX trend
            self.charts.net.update(sys.network.rx_mb || 0);
        }

        // ── 实时网速 ──
        if (sys.net_speed) {
            var el;
            el = document.getElementById('d-speed-rx');
            if (el) el.textContent = formatSpeed(sys.net_speed.rx_bytes_sec);
            el = document.getElementById('d-speed-tx');
            if (el) el.textContent = formatSpeed(sys.net_speed.tx_bytes_sec);
            // Chart: RX solid line, TX dashed line
            self.charts.speed.update(sys.net_speed.rx_bytes_sec || 0, sys.net_speed.tx_bytes_sec || 0);
        }

        // ── 进程内存 ──
        if (sys.process && sys.process.memory_mb !== undefined) {
            var pm = sys.process.memory_mb || 0;
            var el = document.getElementById('d-proc-mem'); if (el) animateNumber(el, pm, 1, ' MB');
            self.charts.proc_mem.update(pm);
        }
        if (sys.process && sys.process.pid !== undefined) {
            var el = document.getElementById('info-pid'); if (el) el.textContent = sys.process.pid;
        }
    },

    destroy: function() {
        if (this.reconnectTimer) { clearTimeout(this.reconnectTimer); this.reconnectTimer = null; }
        if (this.ws) { this.ws.onclose = null; this.ws.close(); this.ws = null; }
        this.charts = {};
    }
};

/* ── 静态信息 ── */
async function fetchSystemStaticInfo() {
    try {
        var sys = await fetch('./api/system', {credentials:'include'}).then(function(r){return r.json();});
        var el;
        if (sys.platform) {
            el = document.getElementById('info-os');     if (el) el.textContent = sys.platform.system || '--';
            el = document.getElementById('info-arch');   if (el) el.textContent = sys.platform.machine || '--';
            el = document.getElementById('info-env');    if (el) el.textContent = sys.platform.env || 'Standard';
        }
        if (sys.cpu) {
            var c = sys.cpu.cores || 0;
            el = document.getElementById('info-cores');  if (el) el.textContent = c + ' / ' + c;
        }
        if (sys.memory) {
            el = document.getElementById('info-mem-total'); if (el) el.textContent = sys.memory.total_gb + ' GB';
        }
        // 框架信息 (部分来自 API)
        try {
            var fw = await fetch('./api/framework', {credentials:'include'}).then(function(r){return r.json();});
            el = document.getElementById('info-fw-ver'); if (el) el.textContent = fw.version || '?';
        } catch(e) {}
        var host = window.location.hostname + (window.location.port ? ':' + window.location.port : '');
        el = document.getElementById('info-addr'); if (el) el.textContent = host;
    } catch(e) {}
}

/* ── 格式化 ── */
function formatUptime(seconds) {
    var h = Math.floor(seconds / 3600);
    var m = Math.floor((seconds % 3600) / 60);
    var s = Math.floor(seconds % 60);
    if (h > 0) return h + 'h ' + m + 'm';
    if (m > 0) return m + 'm ' + s + 's';
    return s + 's';
}

function formatTraffic(mb) {
    if (mb === undefined || mb === null) return '--';
    if (mb >= 1024) return (mb / 1024).toFixed(1) + ' GB';
    if (mb >= 1) return mb.toFixed(1) + ' MB';
    return (mb * 1024).toFixed(0) + ' KB';
}

function formatSpeed(bytesPerSec) {
    if (bytesPerSec === undefined || bytesPerSec === null || bytesPerSec < 0) return '0 B/s';
    if (bytesPerSec >= 1048576) return (bytesPerSec / 1048576).toFixed(1) + ' MB/s';
    if (bytesPerSec >= 1024) return (bytesPerSec / 1024).toFixed(0) + ' KB/s';
    return bytesPerSec.toFixed(0) + ' B/s';
}