/**
 * connection.js - 连接管理 + 系统状态显示
 *
 * 操作 DOM 元素 #pillConn / #pillConnTxt / #connStatus / #connStatusTxt / #bConn 等。
 *
 * 共享状态（通过 window.* 引用）：
 *   window.latestSystemStatus     — 最近一次 /system/status 响应
 *   window.lastSysStateCode       — 上次成功的 sys_state_code（polling.js 读取）
 *   window.lastRelayState         — 上次成功的 relay_state（polling.js 读取）
 *   window.consecutivePollFailures — 连续轮询失败计数（polling.js 读取）
 *
 * 复用的函数（通过 window.* 引用）：
 *   window.getBaseUrl / window.updateSystemStatusUi / window.formatPercent
 */
import { formatBytes, formatTime, formatUptime, escapeHtml } from './utils.js';
import { addLog } from './log.js';
import { showToast } from './toast.js';

// ==================== 连接管理 ====================
export function updateConnectionUi(connected, text) {
  var label = text || (connected ? '已连接' : '未连接');
  // header pill
  var pc = document.getElementById('pillConn');
  var pct = document.getElementById('pillConnTxt');
  if (pc) {
    pc.className = connected ? 'pill online' : 'pill offline';
    if (pct) pct.textContent = label;
  }
  // connection card indicator
  var cs = document.getElementById('connStatus');
  var cst = document.getElementById('connStatusTxt');
  if (cs) cs.className = connected ? 'conn-indicator ok' : 'conn-indicator err';
  if (cst) cst.textContent = connected ? label : '未连接';
  // primary badge
  var bc = document.getElementById('bConn');
  if (bc) {
    bc.textContent = connected ? '在线' : '离线';
    bc.className = 'v ' + (connected ? 'ok' : 'err');
  }
}
export function updateHealthUi(healthCode, freeHeap) {
  var healthNames = ['正常', '警告', '危险', '关机'];
  var health = healthCode !== undefined ? (healthNames[healthCode] || '未知') : '未知';
  var connStatusTxt = document.getElementById('connStatusTxt');
  if (connStatusTxt && window.latestSystemStatus && window.latestSystemStatus.wifi) {
    connStatusTxt.textContent = (window.latestSystemStatus.wifi.connected ? '设备在线' : '设备离线') + ' · 系统' + health;
  }
  if (freeHeap !== undefined) {
    var mHeapEl = document.getElementById('mHeap');
    if (mHeapEl) mHeapEl.textContent = formatBytes(freeHeap);
  }
  var mh = document.getElementById('mHealth');
  if (mh) {
    mh.textContent = health;
    mh.className = 'v ' + (healthCode === 0 ? 'ok' : healthCode === 1 ? 'warn' : 'err');
  }
  ensureHealthBootToggleBound();
}

/** 健康状态 badge 点击展开/收起启动自检面板（只绑一次）。 */
function ensureHealthBootToggleBound() {
  var badge = document.getElementById('healthBadge');
  var panel = document.getElementById('healthBootPanel');
  if (!badge || !panel || badge.dataset.bootToggleBound === '1') return;
  badge.dataset.bootToggleBound = '1';

  function toggle() {
    var open = panel.classList.contains('collapsed') || panel.hasAttribute('hidden');
    if (open) {
      panel.hidden = false;
      panel.classList.remove('collapsed');
      badge.classList.add('is-open');
      badge.setAttribute('aria-expanded', 'true');
    } else {
      panel.hidden = true;
      panel.classList.add('collapsed');
      badge.classList.remove('is-open');
      badge.setAttribute('aria-expanded', 'false');
    }
  }
  badge.addEventListener('click', function (e) {
    e.preventDefault();
    toggle();
  });
  badge.addEventListener('keydown', function (e) {
    if (e.key === 'Enter' || e.key === ' ') {
      e.preventDefault();
      toggle();
    }
  });
}

/** 启动自检内容（/system/status.boot）；挂在健康状态展开区，非常驻。 */
function updateBootInitUi(data) {
  var boot = data && data.boot ? data.boot : null;
  var resultEl = document.getElementById('mBootResult');
  var failedEl = document.getElementById('mBootFailed');
  var listEl = document.getElementById('bootModuleList');
  if (!boot) {
    if (resultEl) {
      resultEl.textContent = '--';
      resultEl.className = 'health-boot-summary';
    }
    if (failedEl) {
      failedEl.textContent = '--';
      failedEl.className = '';
    }
    if (listEl) listEl.innerHTML = '';
    return;
  }

  var criticalOk = !!boot.critical_ok;
  var allOk = !!boot.all_ok;
  var summary = boot.summary || (allOk ? 'OK (all modules)' : (criticalOk ? 'OK (critical)' : 'FAIL'));
  var failed = (boot.failed && String(boot.failed).trim()) ? String(boot.failed) : '';
  var tone = allOk ? 'ok' : (criticalOk ? 'warn' : 'err');

  if (resultEl) {
    resultEl.textContent = summary;
    resultEl.className = 'health-boot-summary ' + tone;
    resultEl.title = 'mask=0x' + (Number(boot.mask) || 0).toString(16);
  }
  if (failedEl) {
    failedEl.textContent = failed || (allOk ? '无' : '--');
    failedEl.className = failed ? tone : 'ok';
  }

  if (listEl) {
    var modules = Array.isArray(boot.modules) ? boot.modules : [];
    if (!modules.length) {
      listEl.innerHTML = '';
    } else {
      listEl.innerHTML = modules.map(function (m) {
        var ok = !!m.ok;
        var critical = !!m.critical;
        var cls = 'boot-mod ' + (ok ? 'ok' : (critical ? 'fail' : 'fail optional'));
        var tip = (m.name || '') + (ok ? ' 成功' : ' 失败') + (critical ? ' · 关键' : ' · 非关键');
        return '<span class="' + cls + '" title="' + escapeHtml(tip) + '">' +
          '<span class="boot-mod-dot"></span>' +
          escapeHtml(m.name || '?') +
          '</span>';
      }).join('');
    }
  }

  if (!window._bootInitLogged) {
    window._bootInitLogged = true;
    var logLine = '启动自检: ' + summary + (failed ? ' · 失败/跳过: ' + failed : '');
    addLog(allOk ? 'I' : (criticalOk ? 'W' : 'E'), 'BOOT', logLine);
  }
  ensureHealthBootToggleBound();
}

export function updateHeapAndTaskStatusUi(data) {
  if (!data) return;
  var formatPercent = window.formatPercent;
  var ota = data.ota || {};
  var setText = function (id, value) {
    var el = document.getElementById(id);
    if (el) el.textContent = value;
  };

  updateBootInitUi(data);

  // ---- 堆概况：已用 / 总计 + 占用条 ----
  function setFill(id, pct) {
    var el = document.getElementById(id);
    if (!el) return;
    el.style.width = Math.max(0, Math.min(100, pct)) + '%';
    el.className = 'heap-bar-fill' + (pct >= 85 ? ' danger' : pct >= 70 ? ' warn' : '');
  }
  function setBar(usageId, fillId, pctId, free, total) {
    if (free === undefined || total === undefined) {
      setText(usageId, '--'); setFill(fillId, 0); setText(pctId, '--');
      return;
    }
    var used = total - free;
    var pct = total > 0 ? (used * 100 / total) : 0;
    setText(usageId, '已用 ' + formatBytes(used) + ' / 总计 ' + formatBytes(total));
    setFill(fillId, pct);
    setText(pctId, pct.toFixed(1) + '%');
  }
  function setCpuFill(pct) {
    var el = document.getElementById('cpuUsageFill');
    if (!el) return;
    var safePct = Math.max(0, Math.min(100, Number(pct) || 0));
    el.style.width = safePct + '%';
    el.className = 'heap-bar-fill cpu-fill' + (safePct >= 85 ? ' danger' : safePct >= 70 ? ' warn' : '');
  }
  function updateCpuUsageUi(cpuData) {
    cpuData = cpuData || {};
    var taskList = document.getElementById('cpuTaskList');
    if (!cpuData.available) {
      setText('cpuUsageText', '未启用 FreeRTOS 统计');
      setText('cpuUsagePct', '--');
      setText('cpuIdlePct', '--');
      setText('cpuSampleMs', '--');
      setText('cpuTaskCount', '--');
      setCpuFill(0);
      if (taskList) taskList.innerHTML = '<div class="status-empty">固件未启用 CPU runtime stats</div>';
      return;
    }
    if (!cpuData.valid) {
      setText('cpuUsageText', '等待下一次采样...');
      setText('cpuUsagePct', '--');
      setText('cpuIdlePct', '--');
      setText('cpuSampleMs', '--');
      setText('cpuTaskCount', '--');
      setCpuFill(0);
      if (taskList) taskList.innerHTML = '<div class="status-empty">首次刷新只建立基线，下一次刷新后显示 CPU 占用</div>';
      return;
    }
    var usagePct = Number(cpuData.usage_pct) || 0;
    var idlePct = Number(cpuData.idle_pct) || 0;
    var sampleMs = Number(cpuData.sample_ms) || 0;
    var tasks = Array.isArray(cpuData.tasks) ? cpuData.tasks.slice() : [];
    tasks.sort(function (a, b) {
      return (Number(b.usage_pct) || 0) - (Number(a.usage_pct) || 0);
    });

    setText('cpuUsageText', 'CPU 已用 ' + formatPercent(usagePct));
    setText('cpuUsagePct', formatPercent(usagePct));
    setText('cpuIdlePct', formatPercent(idlePct));
    setText('cpuSampleMs', sampleMs > 0 ? sampleMs + ' ms' : '--');
    setText('cpuTaskCount', String(tasks.length));
    setCpuFill(usagePct);

    if (taskList) {
      /* 按占用降序渲染全部任务；列表容器 CSS 默认露出约 3 条，其余滚动 */
      if (!tasks.length) {
        taskList.innerHTML = '<div class="status-empty">当前采样没有任务增量</div>';
      } else {
        taskList.innerHTML = tasks.map(function (task) {
          var pct = Number(task.usage_pct) || 0;
          var delta = Number(task.runtime_delta) || 0;
          var fillClass = pct >= 85 ? 'err' : pct >= 70 ? 'warn' : '';
          return '' +
            '<div class="status-task cpu-task">' +
              '<div class="status-task-head">' +
                '<div class="status-task-name">' + escapeHtml(task.name || 'task') + '</div>' +
                '<div class="status-task-ratio">' + escapeHtml(formatPercent(pct)) + '</div>' +
              '</div>' +
              '<div class="status-task-bar"><div class="status-task-bar-fill ' + fillClass + '" style="width:' + Math.max(0, Math.min(100, pct)) + '%"></div></div>' +
              '<div class="status-task-meta">' +
                '<div><span>任务号</span><b>' + escapeHtml(task.task_number) + '</b></div>' +
                '<div><span>增量</span><b>' + escapeHtml(delta) + '</b></div>' +
                '<div><span>占比</span><b>' + escapeHtml(formatPercent(pct)) + '</b></div>' +
              '</div>' +
            '</div>';
        }).join('');
      }
    }
  }
  updateCpuUsageUi(data.cpu);
  setText('mInternalHeap', data.internal_free_heap !== undefined ? formatBytes(data.internal_free_heap) : '--');
  setText('mInternalMinHeap', data.internal_min_free_heap !== undefined ? formatBytes(data.internal_min_free_heap) : '--');
  setText('mInternalLargestBlock', data.internal_largest_free_block !== undefined ? formatBytes(data.internal_largest_free_block) : '--');
  setBar('memInternalUsage', 'memInternalFill', 'memInternalPct', data.internal_free_heap, data.internal_heap_total);

  setText('mLargestBlock', data.largest_free_block !== undefined ? formatBytes(data.largest_free_block) : '--');

  setText('sOtaState', (ota.sys_state || '--') + (Number.isFinite(ota.sys_state_code) ? ' (' + ota.sys_state_code + ')' : ''));
  setText('sRelayState', Number.isFinite(ota.relay_state) ? String(ota.relay_state) : '--');
  if (Number.isFinite(ota.sys_state_code)) window.lastSysStateCode = ota.sys_state_code;
  if (Number.isFinite(ota.relay_state)) window.lastRelayState = ota.relay_state;
  var storedText = '--';
  if (ota.total_size || ota.stored_size) {
    storedText = formatBytes(ota.stored_size || 0) + ' / ' + formatBytes(ota.total_size || 0);
  }
  setText('sOtaStored', storedText);
  setText('sStatusUpdated', formatTime(new Date()));

  var taskList = document.getElementById('taskStackList');
  if (taskList) {
    var taskStack = data.task_stack || {};
    var names = Object.keys(taskStack);
    if (!names.length) {
      taskList.innerHTML = '<div class="status-empty">当前状态未包含任务栈信息</div>';
    } else {
      /* 峰值占用比例降序；容器默认露出最高 3 条，其余滚动 */
      names.sort(function (a, b) {
        var ia = taskStack[a] || {};
        var ib = taskStack[b] || {};
        var sa = Number(ia.stack_size_bytes) || 0;
        var sb = Number(ib.stack_size_bytes) || 0;
        var pa = sa > 0 ? ((Number(ia.peak_used_bytes) || 0) * 100 / sa) : 0;
        var pb = sb > 0 ? ((Number(ib.peak_used_bytes) || 0) * 100 / sb) : 0;
        return pb - pa;
      });
      taskList.innerHTML = names.map(function (name) {
        var item = taskStack[name] || {};
        var stackSize = Number(item.stack_size_bytes) || 0;
        var watermark = Number(item.high_watermark_bytes) || 0;
        var peakUsed = Number(item.peak_used_bytes) || 0;
        var usagePct = stackSize > 0 ? (peakUsed * 100 / stackSize) : 0;
        var fillClass = usagePct >= 85 ? 'err' : usagePct >= 70 ? 'warn' : '';
        return '' +
          '<div class="status-task">' +
            '<div class="status-task-head">' +
              '<div class="status-task-name">' + escapeHtml(name) + '</div>' +
              '<div class="status-task-ratio">' + escapeHtml(formatPercent(usagePct)) + '</div>' +
            '</div>' +
            '<div class="status-task-bar"><div class="status-task-bar-fill ' + fillClass + '" style="width:' + Math.max(0, Math.min(100, usagePct)) + '%"></div></div>' +
            '<div class="status-task-meta">' +
              '<div><span>栈大小</span><b>' + escapeHtml(formatBytes(stackSize)) + '</b></div>' +
              '<div><span>剩余水位</span><b>' + escapeHtml(formatBytes(watermark)) + '</b></div>' +
              '<div><span>峰值占用</span><b>' + escapeHtml(formatBytes(peakUsed)) + '</b></div>' +
            '</div>' +
          '</div>';
      }).join('');
    }
  }

  var statusJson = document.getElementById('statusJson');
  if (statusJson) {
    statusJson.textContent = JSON.stringify(data, null, 2);
  }
}
/** 从设备 IP 推导网关 IP（取前三段 + .1） */
function getGatewayIp() {
  var parts = (window.getEspIp ? window.getEspIp() : '192.168.31.127').split('.');
  if (parts.length === 4) return parts[0] + '.' + parts[1] + '.' + parts[2] + '.1';
  return '192.168.31.1';
}

/**
 * 网络诊断：区分浏览器离线 / 网关不通 / 仅设备不通。
 * 放在 connection.js，避免与 polling.js 形成循环 import。
 */
export async function diagnoseNetwork() {
  var result = [];
  if (navigator.onLine === false) {
    result.push('浏览器无网络连接');
    return result.join('；');
  }
  var gwIp = getGatewayIp();
  var gwOk = false;
  try {
    await fetch('http://' + gwIp + '/', { mode: 'no-cors', signal: AbortSignal.timeout(2000) });
    gwOk = true;
  } catch (_) {}
  if (!gwOk) {
    try {
      await fetch('http://' + gwIp + '/favicon.ico', { mode: 'no-cors', signal: AbortSignal.timeout(1500) });
      gwOk = true;
    } catch (_) {}
  }
  if (!gwOk) {
    result.push('网关 ' + gwIp + ' 不可达（本地网络不通）');
  } else {
    result.push('网关 ' + gwIp + ' 可达');
    var espIp = window.getEspIp ? window.getEspIp() : '设备';
    result.push('设备 ' + espIp + ' 不响应（可能断电、重启中或 WiFi 断开）');
  }
  return result.join('；');
}

/**
 * 统一的 /system/status 抓取器：独立 AbortController，超时后中断，
 * 避免与递归调度的 pollStatus 互相干扰。
 * 成功返回 data，HTTP 非 2xx 抛 Error(含 status)，网络失败抛原 Error。
 */
async function fetchSystemStatus(timeoutMs) {
  var ac = new AbortController();
  var timer = setTimeout(function () { ac.abort(); }, timeoutMs || 3000);
  try {
    var resp = await fetch(window.getBaseUrl() + '/system/status', { signal: ac.signal });
    if (!resp.ok) {
      var err = new Error('HTTP ' + resp.status);
      err.status = resp.status;
      throw err;
    }
    return await resp.json();
  } finally {
    clearTimeout(timer);
  }
}

/** @description 测试与 ESP32 的连接（GET /status）。 */
export async function testConnection() {
  try {
    var data = await fetchSystemStatus(3000);
    window.latestSystemStatus = data;
    window.updateSystemStatusUi(data);
    var wifi = data.wifi || {};
    addLog('I', '连接', wifi.connected
      ? '已连接：' + (wifi.mode || 'STA') + ' ' + (wifi.ip || '')
      : '未连接：' + (wifi.mode || 'STA'));
    showToast(wifi.connected ? 'ESP32 当前在线' : 'ESP32 当前未连接',
      wifi.connected ? 'success' : 'warning');
  } catch (e) {
    if (e && e.status) {
      addLog('E', '连接', 'HTTP ' + e.status);
      showToast('设备响应异常: HTTP ' + e.status, 'error');
      return;
    }
    addLog('E', '连接', '连接失败: ' + e.message);
    // 连接失败时自动诊断
    var diag = await diagnoseNetwork();
    addLog('W', '诊断', diag);
    showToast('无法连接: ' + diag, 'error');
  }
}
export async function refreshSystemStatusNow(event) {
  if (event) {
    event.preventDefault();
    event.stopPropagation();
  }
  try {
    var data = await fetchSystemStatus(3000);
    window.latestSystemStatus = data;
    window.updateSystemStatusUi(data);
    window.consecutivePollFailures = 0;
    addLog('I', '状态', '已手动刷新 /system/status');
  } catch (e) {
    if (e && e.status) {
      addLog('E', '状态', '刷新失败: HTTP ' + e.status);
      showToast('状态刷新失败: HTTP ' + e.status, 'error');
      return;
    }
    addLog('E', '状态', '刷新失败: ' + e.message);
    showToast('状态刷新失败', 'error');
  }
}