// sidepanel/sidepanel.js — Side Panel logic

const STATUS_ICONS = {
  pending: '',
  running: '',
  completed: '\u2713',  // ✓
  failed: '\u2717',     // ✗
  stopped: '\u25A0',    // ■
  manual_completed: '跳',
  skipped: '跳',
};

const logArea = document.getElementById('log-area');
const displayOauthUrl = document.getElementById('display-oauth-url');
const displayLocalhostUrl = document.getElementById('display-localhost-url');
const displayStatus = document.getElementById('display-status');
const statusBar = document.getElementById('status-bar');
const inputEmail = document.getElementById('input-email');
const inputPassword = document.getElementById('input-password');
const btnToggleVpsUrl = document.getElementById('btn-toggle-vps-url');
const btnFetchEmail = document.getElementById('btn-fetch-email');
const btnTogglePassword = document.getElementById('btn-toggle-password');
const btnSaveSettings = document.getElementById('btn-save-settings');
const btnStop = document.getElementById('btn-stop');
const btnReset = document.getElementById('btn-reset');
const stepsProgress = document.getElementById('steps-progress');
const btnAutoRun = document.getElementById('btn-auto-run');
const btnAutoContinue = document.getElementById('btn-auto-continue');
const autoContinueBar = document.getElementById('auto-continue-bar');
const autoScheduleBar = document.getElementById('auto-schedule-bar');
const autoScheduleTitle = document.getElementById('auto-schedule-title');
const autoScheduleMeta = document.getElementById('auto-schedule-meta');
const btnAutoRunNow = document.getElementById('btn-auto-run-now');
const btnAutoCancelSchedule = document.getElementById('btn-auto-cancel-schedule');
const btnClearLog = document.getElementById('btn-clear-log');
const inputVpsUrl = document.getElementById('input-vps-url');
const inputVpsPassword = document.getElementById('input-vps-password');
const selectMailProvider = document.getElementById('select-mail-provider');
const rowInbucketHost = document.getElementById('row-inbucket-host');
const inputInbucketHost = document.getElementById('input-inbucket-host');
const rowInbucketMailbox = document.getElementById('row-inbucket-mailbox');
const inputInbucketMailbox = document.getElementById('input-inbucket-mailbox');
const inputRunCount = document.getElementById('input-run-count');
const inputAutoSkipFailures = document.getElementById('input-auto-skip-failures');
const inputAutoDelayEnabled = document.getElementById('input-auto-delay-enabled');
const inputAutoDelayMinutes = document.getElementById('input-auto-delay-minutes');
const autoStartModal = document.getElementById('auto-start-modal');
const autoStartTitle = autoStartModal?.querySelector('.modal-title');
const autoStartMessage = document.getElementById('auto-start-message');
const btnAutoStartClose = document.getElementById('btn-auto-start-close');
const btnAutoStartCancel = document.getElementById('btn-auto-start-cancel');
const btnAutoStartRestart = document.getElementById('btn-auto-start-restart');
const btnAutoStartContinue = document.getElementById('btn-auto-start-continue');
const STEP_DEFAULT_STATUSES = {
  1: 'pending',
  2: 'pending',
  3: 'pending',
  4: 'pending',
  5: 'pending',
  6: 'pending',
  7: 'pending',
  8: 'pending',
  9: 'pending',
};
const SKIPPABLE_STEPS = new Set([1, 2, 3, 4, 5, 6, 7, 8, 9]);
const AUTO_DELAY_MIN_MINUTES = 1;
const AUTO_DELAY_MAX_MINUTES = 1440;
const AUTO_DELAY_DEFAULT_MINUTES = 30;

let latestState = null;
let currentAutoRun = {
  autoRunning: false,
  phase: 'idle',
  currentRun: 0,
  totalRuns: 1,
  attemptRun: 0,
  scheduledAt: null,
};
let settingsDirty = false;
let settingsSaveInFlight = false;
let settingsAutoSaveTimer = null;
let modalChoiceResolver = null;
let currentModalActions = [];
let scheduledCountdownTimer = null;

const EYE_OPEN_ICON = '<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M1 12s4-7 11-7 11 7 11 7-4 7-11 7S1 12 1 12z"/><circle cx="12" cy="12" r="3"/></svg>';
const EYE_CLOSED_ICON = '<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M17.94 17.94A10.94 10.94 0 0 1 12 19C5 19 1 12 1 12a21.77 21.77 0 0 1 5.06-6.94"/><path d="M9.9 4.24A10.94 10.94 0 0 1 12 5c7 0 11 7 11 7a21.86 21.86 0 0 1-2.16 3.19"/><path d="M1 1l22 22"/><path d="M14.12 14.12a3 3 0 1 1-4.24-4.24"/></svg>';

// ============================================================
// Toast Notifications
// ============================================================

const toastContainer = document.getElementById('toast-container');

const TOAST_ICONS = {
  error: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><line x1="15" y1="9" x2="9" y2="15"/><line x1="9" y1="9" x2="15" y2="15"/></svg>',
  warn: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z"/><line x1="12" y1="9" x2="12" y2="13"/><line x1="12" y1="17" x2="12.01" y2="17"/></svg>',
  success: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M22 11.08V12a10 10 0 1 1-5.93-9.14"/><polyline points="22 4 12 14.01 9 11.01"/></svg>',
  info: '<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><line x1="12" y1="16" x2="12" y2="12"/><line x1="12" y1="8" x2="12.01" y2="8"/></svg>',
};

const LOG_LEVEL_LABELS = {
  info: '信息',
  ok: '成功',
  warn: '警告',
  error: '错误',
};

function showToast(message, type = 'error', duration = 4000) {
  const toast = document.createElement('div');
  toast.className = `toast toast-${type}`;
  toast.innerHTML = `${TOAST_ICONS[type] || ''}<span class="toast-msg">${escapeHtml(message)}</span><button class="toast-close">&times;</button>`;

  toast.querySelector('.toast-close').addEventListener('click', () => dismissToast(toast));
  toastContainer.appendChild(toast);

  if (duration > 0) {
    setTimeout(() => dismissToast(toast), duration);
  }
}

function dismissToast(toast) {
  if (!toast.parentNode) return;
  toast.classList.add('toast-exit');
  toast.addEventListener('animationend', () => toast.remove());
}

function resetActionModalButtons() {
  const buttons = [btnAutoStartCancel, btnAutoStartRestart, btnAutoStartContinue];
  buttons.forEach((button) => {
    if (!button) return;
    button.hidden = true;
    button.disabled = false;
    button.onclick = null;
  });
  currentModalActions = [];
}

function configureActionModalButton(button, action) {
  if (!button) return;
  if (!action) {
    button.hidden = true;
    button.onclick = null;
    return;
  }

  button.hidden = false;
  button.disabled = false;
  button.textContent = action.label;
  button.className = `btn ${action.variant || 'btn-outline'} btn-sm`;
  button.onclick = () => resolveModalChoice(action.id);
}

function resolveModalChoice(choice) {
  if (modalChoiceResolver) {
    modalChoiceResolver(choice);
    modalChoiceResolver = null;
  }
  resetActionModalButtons();
  if (autoStartModal) {
    autoStartModal.hidden = true;
  }
}

function openActionModal({ title, message, actions }) {
  if (!autoStartModal) {
    return Promise.resolve(null);
  }

  if (modalChoiceResolver) {
    resolveModalChoice(null);
  }

  autoStartTitle.textContent = title;
  autoStartMessage.textContent = message;
  currentModalActions = actions || [];
  configureActionModalButton(btnAutoStartCancel, currentModalActions[0]);
  configureActionModalButton(btnAutoStartRestart, currentModalActions[1]);
  configureActionModalButton(btnAutoStartContinue, currentModalActions[2]);
  autoStartModal.hidden = false;

  return new Promise((resolve) => {
    modalChoiceResolver = resolve;
  });
}

function openAutoStartChoiceDialog(startStep) {
  return openActionModal({
    title: '启动自动',
    message: `检测到当前已有流程进度。继续当前会从步骤 ${startStep} 开始自动执行，重新开始会清空当前流程进度并从步骤 1 新开一轮。`,
    actions: [
      { id: null, label: '取消', variant: 'btn-ghost' },
      { id: 'restart', label: '重新开始', variant: 'btn-outline' },
      { id: 'continue', label: '继续当前', variant: 'btn-primary' },
    ],
  });
}

async function openConfirmModal({ title, message, confirmLabel = '确认', confirmVariant = 'btn-primary' }) {
  const choice = await openActionModal({
    title,
    message,
    actions: [
      { id: null, label: '取消', variant: 'btn-ghost' },
      { id: 'confirm', label: confirmLabel, variant: confirmVariant },
    ],
  });
  return choice === 'confirm';
}

function isDoneStatus(status) {
  return status === 'completed' || status === 'manual_completed' || status === 'skipped';
}

function getStepStatuses(state = latestState) {
  return { ...STEP_DEFAULT_STATUSES, ...(state?.stepStatuses || {}) };
}

function getFirstUnfinishedStep(state = latestState) {
  const statuses = getStepStatuses(state);
  for (let step = 1; step <= 9; step++) {
    if (!isDoneStatus(statuses[step])) {
      return step;
    }
  }
  return null;
}

function hasSavedProgress(state = latestState) {
  const statuses = getStepStatuses(state);
  return Object.values(statuses).some((status) => status !== 'pending');
}

function shouldOfferAutoModeChoice(state = latestState) {
  return hasSavedProgress(state) && getFirstUnfinishedStep(state) !== null;
}

function syncLatestState(nextState) {
  const mergedStepStatuses = nextState?.stepStatuses
    ? { ...STEP_DEFAULT_STATUSES, ...(latestState?.stepStatuses || {}), ...nextState.stepStatuses }
    : getStepStatuses(latestState);

  latestState = {
    ...(latestState || {}),
    ...(nextState || {}),
    stepStatuses: mergedStepStatuses,
  };
}

function syncAutoRunState(source = {}) {
  const phase = source.autoRunPhase ?? source.phase ?? currentAutoRun.phase;
  const autoRunning = source.autoRunning !== undefined
    ? Boolean(source.autoRunning)
    : (source.autoRunPhase !== undefined || source.phase !== undefined
      ? ['scheduled', 'running', 'waiting_email', 'retrying'].includes(phase)
      : currentAutoRun.autoRunning);

  currentAutoRun = {
    autoRunning,
    phase,
    currentRun: source.autoRunCurrentRun ?? source.currentRun ?? currentAutoRun.currentRun,
    totalRuns: source.autoRunTotalRuns ?? source.totalRuns ?? currentAutoRun.totalRuns,
    attemptRun: source.autoRunAttemptRun ?? source.attemptRun ?? currentAutoRun.attemptRun,
    scheduledAt: source.scheduledAutoRunAt ?? source.scheduledAt ?? currentAutoRun.scheduledAt,
  };
}

function isAutoRunLockedPhase() {
  return currentAutoRun.phase === 'running' || currentAutoRun.phase === 'retrying';
}

function isAutoRunPausedPhase() {
  return currentAutoRun.phase === 'waiting_email';
}

function isAutoRunScheduledPhase() {
  return currentAutoRun.phase === 'scheduled';
}

function getAutoRunLabel(payload = currentAutoRun) {
  if ((payload.phase ?? currentAutoRun.phase) === 'scheduled') {
    return (payload.totalRuns || 1) > 1 ? ` (${payload.totalRuns}轮)` : '';
  }
  const attemptLabel = payload.attemptRun ? ` · 尝试${payload.attemptRun}` : '';
  if ((payload.totalRuns || 1) > 1) {
    return ` (${payload.currentRun}/${payload.totalRuns}${attemptLabel})`;
  }
  return attemptLabel ? ` (${attemptLabel.slice(3)})` : '';
}

function normalizeAutoDelayMinutes(value) {
  const numeric = Number(value);
  if (!Number.isFinite(numeric)) {
    return AUTO_DELAY_DEFAULT_MINUTES;
  }
  return Math.min(AUTO_DELAY_MAX_MINUTES, Math.max(AUTO_DELAY_MIN_MINUTES, Math.floor(numeric)));
}

function updateAutoDelayInputState() {
  const scheduled = isAutoRunScheduledPhase();
  inputAutoDelayEnabled.disabled = scheduled;
  inputAutoDelayMinutes.disabled = scheduled || !inputAutoDelayEnabled.checked;
}

function formatCountdown(remainingMs) {
  const totalSeconds = Math.max(0, Math.ceil(remainingMs / 1000));
  const hours = Math.floor(totalSeconds / 3600);
  const minutes = Math.floor((totalSeconds % 3600) / 60);
  const seconds = totalSeconds % 60;
  return `${String(hours).padStart(2, '0')}:${String(minutes).padStart(2, '0')}:${String(seconds).padStart(2, '0')}`;
}

function formatScheduleTime(timestamp) {
  return new Date(timestamp).toLocaleString('zh-CN', {
    hour12: false,
    month: '2-digit',
    day: '2-digit',
    hour: '2-digit',
    minute: '2-digit',
    second: '2-digit',
  });
}

function stopScheduledCountdownTicker() {
  clearInterval(scheduledCountdownTimer);
  scheduledCountdownTimer = null;
}

function renderScheduledAutoRunInfo() {
  if (!autoScheduleBar) {
    return;
  }

  if (!isAutoRunScheduledPhase() || !Number.isFinite(currentAutoRun.scheduledAt)) {
    autoScheduleBar.style.display = 'none';
    return;
  }

  const remainingMs = currentAutoRun.scheduledAt - Date.now();
  autoScheduleBar.style.display = 'flex';
  autoScheduleTitle.textContent = '已计划自动运行';
  autoScheduleMeta.textContent = remainingMs > 0
    ? `计划于 ${formatScheduleTime(currentAutoRun.scheduledAt)} 开始，剩余 ${formatCountdown(remainingMs)}`
    : '倒计时即将结束，正在准备启动...';
}

function syncScheduledCountdownTicker() {
  renderScheduledAutoRunInfo();
  if (!isAutoRunScheduledPhase() || !Number.isFinite(currentAutoRun.scheduledAt)) {
    stopScheduledCountdownTicker();
    return;
  }

  if (scheduledCountdownTimer) {
    return;
  }

  scheduledCountdownTimer = setInterval(() => {
    renderScheduledAutoRunInfo();
    updateStatusDisplay(latestState);
  }, 1000);
}

function setDefaultAutoRunButton() {
  btnAutoRun.disabled = false;
  inputRunCount.disabled = false;
  btnAutoRun.innerHTML = '<svg width="14" height="14" viewBox="0 0 24 24" fill="currentColor"><polygon points="5 3 19 12 5 21 5 3"/></svg> 自动';
}

function collectSettingsPayload() {
  return {
    vpsUrl: inputVpsUrl.value.trim(),
    vpsPassword: inputVpsPassword.value,
    customPassword: inputPassword.value,
    mailProvider: selectMailProvider.value,
    inbucketHost: inputInbucketHost.value.trim(),
    inbucketMailbox: inputInbucketMailbox.value.trim(),
    autoRunSkipFailures: inputAutoSkipFailures.checked,
    autoRunDelayEnabled: inputAutoDelayEnabled.checked,
    autoRunDelayMinutes: normalizeAutoDelayMinutes(inputAutoDelayMinutes.value),
  };
}

function markSettingsDirty(isDirty = true) {
  settingsDirty = isDirty;
  updateSaveButtonState();
}

function updateSaveButtonState() {
  btnSaveSettings.disabled = settingsSaveInFlight || !settingsDirty;
  btnSaveSettings.textContent = settingsSaveInFlight ? '保存中' : '保存';
}

function scheduleSettingsAutoSave() {
  clearTimeout(settingsAutoSaveTimer);
  settingsAutoSaveTimer = setTimeout(() => {
    saveSettings({ silent: true }).catch(() => { });
  }, 500);
}

async function saveSettings(options = {}) {
  const { silent = false } = options;
  clearTimeout(settingsAutoSaveTimer);

  if (!settingsDirty && !settingsSaveInFlight && silent) {
    return;
  }

  const payload = collectSettingsPayload();
  settingsSaveInFlight = true;
  updateSaveButtonState();

  try {
    const response = await chrome.runtime.sendMessage({
      type: 'SAVE_SETTING',
      source: 'sidepanel',
      payload,
    });

    if (response?.error) {
      throw new Error(response.error);
    }

    syncLatestState(payload);
    markSettingsDirty(false);
    updateMailProviderUI();
    updateButtonStates();
    if (!silent) {
      showToast('配置已保存', 'success', 1800);
    }
  } catch (err) {
    markSettingsDirty(true);
    if (!silent) {
      showToast(`保存失败：${err.message}`, 'error');
    }
    throw err;
  } finally {
    settingsSaveInFlight = false;
    updateSaveButtonState();
  }
}

function applyAutoRunStatus(payload = currentAutoRun) {
  syncAutoRunState(payload);
  const runLabel = getAutoRunLabel(currentAutoRun);
  const locked = isAutoRunLockedPhase();
  const paused = isAutoRunPausedPhase();
  const scheduled = isAutoRunScheduledPhase();

  inputRunCount.disabled = currentAutoRun.autoRunning;
  btnAutoRun.disabled = currentAutoRun.autoRunning;
  btnFetchEmail.disabled = locked;
  inputEmail.disabled = locked;
  inputAutoSkipFailures.disabled = scheduled;

  if (currentAutoRun.totalRuns > 0) {
    inputRunCount.value = String(currentAutoRun.totalRuns);
  }

  switch (currentAutoRun.phase) {
    case 'scheduled':
      autoContinueBar.style.display = 'none';
      btnAutoRun.innerHTML = `已计划${runLabel}`;
      break;
    case 'waiting_email':
      autoContinueBar.style.display = 'flex';
      btnAutoRun.innerHTML = `已暂停${runLabel}`;
      break;
    case 'running':
      autoContinueBar.style.display = 'none';
      btnAutoRun.innerHTML = `运行中${runLabel}`;
      break;
    case 'retrying':
      autoContinueBar.style.display = 'none';
      btnAutoRun.innerHTML = `重试中${runLabel}`;
      break;
    default:
      autoContinueBar.style.display = 'none';
      setDefaultAutoRunButton();
      inputEmail.disabled = false;
      if (!locked) {
        btnFetchEmail.disabled = false;
      }
      break;
  }

  updateAutoDelayInputState();
  syncScheduledCountdownTicker();
  updateStopButtonState(scheduled || paused || locked || Object.values(getStepStatuses()).some(status => status === 'running'));
}

function initializeManualStepActions() {
  document.querySelectorAll('.step-row').forEach((row) => {
    const step = Number(row.dataset.step);
    const statusEl = row.querySelector('.step-status');
    if (!statusEl) return;

    const actions = document.createElement('div');
    actions.className = 'step-actions';

    const manualBtn = document.createElement('button');
    manualBtn.type = 'button';
    manualBtn.className = 'step-manual-btn';
    manualBtn.dataset.step = String(step);
    manualBtn.title = '跳过此步';
    manualBtn.setAttribute('aria-label', `跳过步骤 ${step}`);
    manualBtn.innerHTML = '<svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><polyline points="13 17 18 12 13 7"/><polyline points="6 17 11 12 6 7"/></svg>';
    manualBtn.addEventListener('click', async (event) => {
      event.stopPropagation();
      try {
        await handleSkipStep(step);
      } catch (err) {
        showToast(err.message, 'error');
      }
    });

    statusEl.parentNode.replaceChild(actions, statusEl);
    actions.appendChild(manualBtn);
    actions.appendChild(statusEl);
  });
}

// ============================================================
// State Restore on load
// ============================================================

async function restoreState() {
  try {
    const state = await chrome.runtime.sendMessage({ type: 'GET_STATE', source: 'sidepanel' });
    syncLatestState(state);
    syncAutoRunState(state);

    if (state.oauthUrl) {
      displayOauthUrl.textContent = state.oauthUrl;
      displayOauthUrl.classList.add('has-value');
    }
    if (state.localhostUrl) {
      displayLocalhostUrl.textContent = state.localhostUrl;
      displayLocalhostUrl.classList.add('has-value');
    }
    if (state.email) {
      inputEmail.value = state.email;
    }
    syncPasswordField(state);
    if (state.vpsUrl) {
      inputVpsUrl.value = state.vpsUrl;
    }
    if (state.vpsPassword) {
      inputVpsPassword.value = state.vpsPassword;
    }
    if (state.mailProvider) {
      selectMailProvider.value = state.mailProvider;
    }
    if (state.inbucketHost) {
      inputInbucketHost.value = state.inbucketHost;
    }
    if (state.inbucketMailbox) {
      inputInbucketMailbox.value = state.inbucketMailbox;
    }
    inputAutoSkipFailures.checked = Boolean(state.autoRunSkipFailures);
    inputAutoDelayEnabled.checked = Boolean(state.autoRunDelayEnabled);
    inputAutoDelayMinutes.value = String(normalizeAutoDelayMinutes(state.autoRunDelayMinutes));
    if (state.autoRunTotalRuns) {
      inputRunCount.value = String(state.autoRunTotalRuns);
    }

    if (state.stepStatuses) {
      for (const [step, status] of Object.entries(state.stepStatuses)) {
        updateStepUI(Number(step), status);
      }
    }

    if (state.logs) {
      for (const entry of state.logs) {
        appendLog(entry);
      }
    }

    applyAutoRunStatus(state);
    markSettingsDirty(false);
    updateAutoDelayInputState();
    updateStatusDisplay(latestState);
    updateProgressCounter();
    updateMailProviderUI();
    updateButtonStates();
  } catch (err) {
    console.error('Failed to restore state:', err);
  }
}

function syncPasswordField(state) {
  inputPassword.value = state.customPassword || state.password || '';
}

function updateMailProviderUI() {
  const useInbucket = selectMailProvider.value === 'inbucket';
  rowInbucketHost.style.display = useInbucket ? '' : 'none';
  rowInbucketMailbox.style.display = useInbucket ? '' : 'none';
}

// ============================================================
// UI Updates
// ============================================================

function updateStepUI(step, status) {
  const statusEl = document.querySelector(`.step-status[data-step="${step}"]`);
  const row = document.querySelector(`.step-row[data-step="${step}"]`);

  syncLatestState({
    stepStatuses: {
      ...getStepStatuses(),
      [step]: status,
    },
  });

  if (statusEl) statusEl.textContent = STATUS_ICONS[status] || '';
  if (row) {
    row.className = `step-row ${status}`;
  }

  updateButtonStates();
  updateProgressCounter();
}

function updateProgressCounter() {
  const completed = Object.values(getStepStatuses()).filter(isDoneStatus).length;
  stepsProgress.textContent = `${completed} / 9`;
}

function updateButtonStates() {
  const statuses = getStepStatuses();
  const anyRunning = Object.values(statuses).some(s => s === 'running');
  const autoLocked = isAutoRunLockedPhase();
  const autoScheduled = isAutoRunScheduledPhase();

  for (let step = 1; step <= 9; step++) {
    const btn = document.querySelector(`.step-btn[data-step="${step}"]`);
    if (!btn) continue;

    if (anyRunning || autoLocked || autoScheduled) {
      btn.disabled = true;
    } else if (step === 1) {
      btn.disabled = false;
    } else {
      const prevStatus = statuses[step - 1];
      const currentStatus = statuses[step];
      btn.disabled = !(isDoneStatus(prevStatus) || currentStatus === 'failed' || isDoneStatus(currentStatus) || currentStatus === 'stopped');
    }
  }

  document.querySelectorAll('.step-manual-btn').forEach((btn) => {
    const step = Number(btn.dataset.step);
    const currentStatus = statuses[step];
    const prevStatus = statuses[step - 1];

    if (!SKIPPABLE_STEPS.has(step) || anyRunning || autoLocked || autoScheduled || currentStatus === 'running' || isDoneStatus(currentStatus)) {
      btn.style.display = 'none';
      btn.disabled = true;
      btn.title = '当前不可跳过';
      return;
    }

    if (step > 1 && !isDoneStatus(prevStatus)) {
      btn.style.display = 'none';
      btn.disabled = true;
      btn.title = `请先完成步骤 ${step - 1}`;
      return;
    }

    btn.style.display = '';
    btn.disabled = false;
    btn.title = `跳过步骤 ${step}`;
  });

  btnReset.disabled = anyRunning || autoScheduled || isAutoRunPausedPhase() || autoLocked;
  updateStopButtonState(anyRunning || autoScheduled || isAutoRunPausedPhase() || autoLocked);
}

function updateStopButtonState(active) {
  btnStop.disabled = !active;
}

function updateStatusDisplay(state) {
  if (!state || !state.stepStatuses) return;

  statusBar.className = 'status-bar';

  if (isAutoRunScheduledPhase()) {
    const remainingMs = Number.isFinite(currentAutoRun.scheduledAt)
      ? currentAutoRun.scheduledAt - Date.now()
      : 0;
    displayStatus.textContent = remainingMs > 0
      ? `自动计划中，剩余 ${formatCountdown(remainingMs)}`
      : '倒计时即将结束，正在准备启动...';
    statusBar.classList.add('scheduled');
    return;
  }

  if (isAutoRunPausedPhase()) {
    displayStatus.textContent = `自动已暂停${getAutoRunLabel()}，等待邮箱后继续`;
    statusBar.classList.add('paused');
    return;
  }

  const running = Object.entries(state.stepStatuses).find(([, s]) => s === 'running');
  if (running) {
    displayStatus.textContent = `步骤 ${running[0]} 运行中...`;
    statusBar.classList.add('running');
    return;
  }

  if (isAutoRunLockedPhase()) {
    displayStatus.textContent = `${currentAutoRun.phase === 'retrying' ? '自动重试中' : '自动运行中'}${getAutoRunLabel()}`;
    statusBar.classList.add('running');
    return;
  }

  const failed = Object.entries(state.stepStatuses).find(([, s]) => s === 'failed');
  if (failed) {
    displayStatus.textContent = `步骤 ${failed[0]} 失败`;
    statusBar.classList.add('failed');
    return;
  }

  const stopped = Object.entries(state.stepStatuses).find(([, s]) => s === 'stopped');
  if (stopped) {
    displayStatus.textContent = `步骤 ${stopped[0]} 已停止`;
    statusBar.classList.add('stopped');
    return;
  }

  const lastCompleted = Object.entries(state.stepStatuses)
    .filter(([, s]) => isDoneStatus(s))
    .map(([k]) => Number(k))
    .sort((a, b) => b - a)[0];

  if (lastCompleted === 9) {
    displayStatus.textContent = (state.stepStatuses[9] === 'manual_completed' || state.stepStatuses[9] === 'skipped') ? '全部步骤已跳过/完成' : '全部步骤已完成';
    statusBar.classList.add('completed');
  } else if (lastCompleted) {
    displayStatus.textContent = (state.stepStatuses[lastCompleted] === 'manual_completed' || state.stepStatuses[lastCompleted] === 'skipped')
      ? `步骤 ${lastCompleted} 已跳过`
      : `步骤 ${lastCompleted} 已完成`;
  } else {
    displayStatus.textContent = '就绪';
  }
}

function appendLog(entry) {
  const time = new Date(entry.timestamp).toLocaleTimeString('zh-CN', { hour12: false });
  const levelLabel = LOG_LEVEL_LABELS[entry.level] || entry.level;
  const line = document.createElement('div');
  line.className = `log-line log-${entry.level}`;

  const stepMatch = entry.message.match(/(?:Step\s+(\d+)|步骤\s*(\d+))/);
  const stepNum = stepMatch ? (stepMatch[1] || stepMatch[2]) : null;

  let html = `<span class="log-time">${time}</span> `;
  html += `<span class="log-level log-level-${entry.level}">${levelLabel}</span> `;
  if (stepNum) {
    html += `<span class="log-step-tag step-${stepNum}">步${stepNum}</span>`;
  }
  html += `<span class="log-msg">${escapeHtml(entry.message)}</span>`;

  line.innerHTML = html;
  logArea.appendChild(line);
  logArea.scrollTop = logArea.scrollHeight;
}

function escapeHtml(text) {
  const div = document.createElement('div');
  div.textContent = text;
  return div.innerHTML;
}

async function fetchDuckEmail(options = {}) {
  const { showFailureToast = true } = options;
  const defaultLabel = '获取';
  btnFetchEmail.disabled = true;
  btnFetchEmail.textContent = '...';

  try {
    const response = await chrome.runtime.sendMessage({
      type: 'FETCH_DUCK_EMAIL',
      source: 'sidepanel',
      payload: { generateNew: true },
    });

    if (response?.error) {
      throw new Error(response.error);
    }
    if (!response?.email) {
      throw new Error('未返回 Duck 邮箱。');
    }

    inputEmail.value = response.email;
    showToast(`已获取 ${response.email}`, 'success', 2500);
    return response.email;
  } catch (err) {
    if (showFailureToast) {
      showToast(`自动获取失败：${err.message}`, 'error');
    }
    throw err;
  } finally {
    btnFetchEmail.disabled = false;
    btnFetchEmail.textContent = defaultLabel;
  }
}

function syncToggleButtonLabel(button, input, labels) {
  if (!button || !input) return;

  const isHidden = input.type === 'password';
  button.innerHTML = isHidden ? EYE_OPEN_ICON : EYE_CLOSED_ICON;
  button.setAttribute('aria-label', isHidden ? labels.show : labels.hide);
  button.title = isHidden ? labels.show : labels.hide;
}

function syncPasswordToggleLabel() {
  syncToggleButtonLabel(btnTogglePassword, inputPassword, {
    show: '显示密码',
    hide: '隐藏密码',
  });
}

function syncVpsUrlToggleLabel() {
  syncToggleButtonLabel(btnToggleVpsUrl, inputVpsUrl, {
    show: '显示 CPA 地址',
    hide: '隐藏 CPA 地址',
  });
}

async function maybeTakeoverAutoRun(actionLabel) {
  if (!isAutoRunPausedPhase()) {
    return true;
  }

  const confirmed = await openConfirmModal({
    title: '接管自动',
    message: `当前自动流程已暂停。若继续${actionLabel}，将停止自动流程并切换为手动控制。是否继续？`,
    confirmLabel: '确认接管',
    confirmVariant: 'btn-primary',
  });
  if (!confirmed) {
    return false;
  }

  await chrome.runtime.sendMessage({ type: 'TAKEOVER_AUTO_RUN', source: 'sidepanel', payload: {} });
  return true;
}

async function handleSkipStep(step) {
  if (isAutoRunPausedPhase()) {
    const takeoverResponse = await chrome.runtime.sendMessage({
      type: 'TAKEOVER_AUTO_RUN',
      source: 'sidepanel',
      payload: {},
    });
    if (takeoverResponse?.error) {
      throw new Error(takeoverResponse.error);
    }
  }

  const response = await chrome.runtime.sendMessage({
    type: 'SKIP_STEP',
    source: 'sidepanel',
    payload: { step },
  });

  if (response?.error) {
    throw new Error(response.error);
  }

  showToast(`步骤 ${step} 已跳过`, 'success', 2200);
}

// ============================================================
// Button Handlers
// ============================================================

document.querySelectorAll('.step-btn').forEach(btn => {
  btn.addEventListener('click', async () => {
    try {
      const step = Number(btn.dataset.step);
      if (!(await maybeTakeoverAutoRun(`执行步骤 ${step}`))) {
        return;
      }
      if (step === 3) {
        if (inputPassword.value !== (latestState?.customPassword || '')) {
          await chrome.runtime.sendMessage({
            type: 'SAVE_SETTING',
            source: 'sidepanel',
            payload: { customPassword: inputPassword.value },
          });
          syncLatestState({ customPassword: inputPassword.value });
        }
        let email = inputEmail.value.trim();
        if (!email) {
          try {
            email = await fetchDuckEmail({ showFailureToast: false });
          } catch (err) {
            showToast(`自动获取失败：${err.message}，请手动粘贴邮箱后重试。`, 'warn');
            return;
          }
        }
        const response = await chrome.runtime.sendMessage({ type: 'EXECUTE_STEP', source: 'sidepanel', payload: { step, email } });
        if (response?.error) {
          throw new Error(response.error);
        }
      } else {
        const response = await chrome.runtime.sendMessage({ type: 'EXECUTE_STEP', source: 'sidepanel', payload: { step } });
        if (response?.error) {
          throw new Error(response.error);
        }
      }
    } catch (err) {
      showToast(err.message, 'error');
    }
  });
});

btnFetchEmail.addEventListener('click', async () => {
  await fetchDuckEmail().catch(() => { });
});

btnTogglePassword.addEventListener('click', () => {
  inputPassword.type = inputPassword.type === 'password' ? 'text' : 'password';
  syncPasswordToggleLabel();
});

btnToggleVpsUrl.addEventListener('click', () => {
  inputVpsUrl.type = inputVpsUrl.type === 'password' ? 'text' : 'password';
  syncVpsUrlToggleLabel();
});

btnSaveSettings.addEventListener('click', async () => {
  if (!settingsDirty) {
    showToast('配置已是最新', 'info', 1400);
    return;
  }
  await saveSettings({ silent: false }).catch(() => { });
});

btnStop.addEventListener('click', async () => {
  btnStop.disabled = true;
  await chrome.runtime.sendMessage({ type: 'STOP_FLOW', source: 'sidepanel', payload: {} });
  showToast(isAutoRunScheduledPhase() ? '正在取消倒计时计划...' : '正在停止当前流程...', 'warn', 2000);
});

autoStartModal?.addEventListener('click', (event) => {
  if (event.target === autoStartModal) {
    resolveModalChoice(null);
  }
});
btnAutoStartClose?.addEventListener('click', () => resolveModalChoice(null));

// Auto Run
btnAutoRun.addEventListener('click', async () => {
  try {
    const totalRuns = Math.min(50, Math.max(1, parseInt(inputRunCount.value, 10) || 1));
    let mode = 'restart';

    if (shouldOfferAutoModeChoice()) {
      const startStep = getFirstUnfinishedStep();
      const choice = await openAutoStartChoiceDialog(startStep);
      if (!choice) {
        return;
      }
      mode = choice;
    }

    btnAutoRun.disabled = true;
    inputRunCount.disabled = true;
    const delayEnabled = inputAutoDelayEnabled.checked;
    const delayMinutes = normalizeAutoDelayMinutes(inputAutoDelayMinutes.value);
    inputAutoDelayMinutes.value = String(delayMinutes);
    btnAutoRun.innerHTML = delayEnabled
      ? '<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="10"/><path d="M12 6v6l4 2"/></svg> 计划中...'
      : '<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="12" cy="12" r="10"/><path d="M12 6v6l4 2"/></svg> 运行中...';
    const response = await chrome.runtime.sendMessage({
      type: delayEnabled ? 'SCHEDULE_AUTO_RUN' : 'AUTO_RUN',
      source: 'sidepanel',
      payload: {
        totalRuns,
        delayMinutes,
        autoRunSkipFailures: inputAutoSkipFailures.checked,
        mode,
      },
    });
    if (response?.error) {
      throw new Error(response.error);
    }
  } catch (err) {
    setDefaultAutoRunButton();
    inputRunCount.disabled = false;
    showToast(err.message, 'error');
  }
});

btnAutoContinue.addEventListener('click', async () => {
  const email = inputEmail.value.trim();
  if (!email) {
    showToast('请先获取或粘贴 DuckDuckGo 邮箱。', 'warn');
    return;
  }
  autoContinueBar.style.display = 'none';
  await chrome.runtime.sendMessage({ type: 'RESUME_AUTO_RUN', source: 'sidepanel', payload: { email } });
});

btnAutoRunNow?.addEventListener('click', async () => {
  try {
    btnAutoRunNow.disabled = true;
    await chrome.runtime.sendMessage({ type: 'START_SCHEDULED_AUTO_RUN_NOW', source: 'sidepanel', payload: {} });
  } catch (err) {
    showToast(err.message, 'error');
  } finally {
    btnAutoRunNow.disabled = false;
  }
});

btnAutoCancelSchedule?.addEventListener('click', async () => {
  try {
    btnAutoCancelSchedule.disabled = true;
    await chrome.runtime.sendMessage({ type: 'CANCEL_SCHEDULED_AUTO_RUN', source: 'sidepanel', payload: {} });
    showToast('已取消倒计时计划。', 'info', 1800);
  } catch (err) {
    showToast(err.message, 'error');
  } finally {
    btnAutoCancelSchedule.disabled = false;
  }
});

// Reset
btnReset.addEventListener('click', async () => {
  const confirmed = await openConfirmModal({
    title: '重置流程',
    message: '确认重置全部步骤和数据吗？',
    confirmLabel: '确认重置',
    confirmVariant: 'btn-danger',
  });
  if (!confirmed) {
    return;
  }

  await chrome.runtime.sendMessage({ type: 'RESET', source: 'sidepanel' });
  syncLatestState({ stepStatuses: STEP_DEFAULT_STATUSES });
  syncAutoRunState({ autoRunning: false, autoRunPhase: 'idle', autoRunCurrentRun: 0, autoRunTotalRuns: 1, autoRunAttemptRun: 0, scheduledAutoRunAt: null });
  displayOauthUrl.textContent = '等待中...';
  displayOauthUrl.classList.remove('has-value');
  displayLocalhostUrl.textContent = '等待中...';
  displayLocalhostUrl.classList.remove('has-value');
  inputEmail.value = '';
  displayStatus.textContent = '就绪';
  statusBar.className = 'status-bar';
  logArea.innerHTML = '';
  document.querySelectorAll('.step-row').forEach(row => row.className = 'step-row');
  document.querySelectorAll('.step-status').forEach(el => el.textContent = '');
  setDefaultAutoRunButton();
  applyAutoRunStatus(currentAutoRun);
  markSettingsDirty(false);
  updateStopButtonState(false);
  updateButtonStates();
  updateProgressCounter();
});

// Clear log
btnClearLog.addEventListener('click', () => {
  logArea.innerHTML = '';
});

// Save settings on change
inputEmail.addEventListener('change', async () => {
  const email = inputEmail.value.trim();
  if (email) {
    await chrome.runtime.sendMessage({ type: 'SAVE_EMAIL', source: 'sidepanel', payload: { email } });
  }
});
inputEmail.addEventListener('input', updateButtonStates);
inputVpsUrl.addEventListener('input', () => {
  markSettingsDirty(true);
  scheduleSettingsAutoSave();
});
inputVpsUrl.addEventListener('blur', () => {
  saveSettings({ silent: true }).catch(() => { });
});

inputVpsPassword.addEventListener('input', () => {
  markSettingsDirty(true);
  scheduleSettingsAutoSave();
});
inputVpsPassword.addEventListener('blur', () => {
  saveSettings({ silent: true }).catch(() => { });
});

inputPassword.addEventListener('input', () => {
  markSettingsDirty(true);
  updateButtonStates();
  scheduleSettingsAutoSave();
});
inputPassword.addEventListener('blur', () => {
  saveSettings({ silent: true }).catch(() => { });
});

selectMailProvider.addEventListener('change', () => {
  updateMailProviderUI();
  markSettingsDirty(true);
  saveSettings({ silent: true }).catch(() => { });
});

inputInbucketMailbox.addEventListener('input', () => {
  markSettingsDirty(true);
  scheduleSettingsAutoSave();
});
inputInbucketMailbox.addEventListener('blur', () => {
  saveSettings({ silent: true }).catch(() => { });
});

inputInbucketHost.addEventListener('input', () => {
  markSettingsDirty(true);
  scheduleSettingsAutoSave();
});
inputInbucketHost.addEventListener('blur', () => {
  saveSettings({ silent: true }).catch(() => { });
});

inputAutoSkipFailures.addEventListener('change', () => {
  markSettingsDirty(true);
  saveSettings({ silent: true }).catch(() => { });
});

inputAutoDelayEnabled.addEventListener('change', () => {
  updateAutoDelayInputState();
  markSettingsDirty(true);
  saveSettings({ silent: true }).catch(() => { });
});

inputAutoDelayMinutes.addEventListener('input', () => {
  markSettingsDirty(true);
  scheduleSettingsAutoSave();
});
inputAutoDelayMinutes.addEventListener('blur', () => {
  inputAutoDelayMinutes.value = String(normalizeAutoDelayMinutes(inputAutoDelayMinutes.value));
  saveSettings({ silent: true }).catch(() => { });
});

// ============================================================
// Listen for Background broadcasts
// ============================================================

chrome.runtime.onMessage.addListener((message) => {
  switch (message.type) {
    case 'LOG_ENTRY':
      appendLog(message.payload);
      if (message.payload.level === 'error') {
        showToast(message.payload.message, 'error');
      }
      break;

    case 'STEP_STATUS_CHANGED': {
      const { step, status } = message.payload;
      updateStepUI(step, status);
      chrome.runtime.sendMessage({ type: 'GET_STATE', source: 'sidepanel' }).then(state => {
        syncLatestState(state);
        syncAutoRunState(state);
        updateStatusDisplay(latestState);
        updateButtonStates();
        if (status === 'completed' || status === 'manual_completed' || status === 'skipped') {
          syncPasswordField(state);
          if (state.oauthUrl) {
            displayOauthUrl.textContent = state.oauthUrl;
            displayOauthUrl.classList.add('has-value');
          }
          if (state.localhostUrl) {
            displayLocalhostUrl.textContent = state.localhostUrl;
            displayLocalhostUrl.classList.add('has-value');
          }
        }
      }
      ).catch(() => { });
      break;
    }

    case 'AUTO_RUN_RESET': {
      // Full UI reset for next run
      syncLatestState({
        oauthUrl: null,
        localhostUrl: null,
        email: null,
        password: null,
        stepStatuses: STEP_DEFAULT_STATUSES,
        logs: [],
        scheduledAutoRunAt: null,
      });
      displayOauthUrl.textContent = '等待中...';
      displayOauthUrl.classList.remove('has-value');
      displayLocalhostUrl.textContent = '等待中...';
      displayLocalhostUrl.classList.remove('has-value');
      inputEmail.value = '';
      displayStatus.textContent = '就绪';
      statusBar.className = 'status-bar';
      logArea.innerHTML = '';
      document.querySelectorAll('.step-row').forEach(row => row.className = 'step-row');
      document.querySelectorAll('.step-status').forEach(el => el.textContent = '');
      applyAutoRunStatus(currentAutoRun);
      updateProgressCounter();
      updateButtonStates();
      break;
    }

    case 'DATA_UPDATED': {
      syncLatestState(message.payload);
      if (message.payload.email) {
        inputEmail.value = message.payload.email;
      }
      if (message.payload.password !== undefined) {
        inputPassword.value = message.payload.password || '';
      }
      if (message.payload.oauthUrl) {
        displayOauthUrl.textContent = message.payload.oauthUrl;
        displayOauthUrl.classList.add('has-value');
      }
      if (message.payload.localhostUrl) {
        displayLocalhostUrl.textContent = message.payload.localhostUrl;
        displayLocalhostUrl.classList.add('has-value');
      }
      if (message.payload.autoRunDelayEnabled !== undefined) {
        inputAutoDelayEnabled.checked = Boolean(message.payload.autoRunDelayEnabled);
        updateAutoDelayInputState();
      }
      if (message.payload.autoRunDelayMinutes !== undefined) {
        inputAutoDelayMinutes.value = String(normalizeAutoDelayMinutes(message.payload.autoRunDelayMinutes));
      }
      break;
    }

    case 'AUTO_RUN_STATUS': {
      syncLatestState({
        autoRunning: ['scheduled', 'running', 'waiting_email', 'retrying'].includes(message.payload.phase),
        autoRunPhase: message.payload.phase,
        autoRunCurrentRun: message.payload.currentRun,
        autoRunTotalRuns: message.payload.totalRuns,
        autoRunAttemptRun: message.payload.attemptRun,
        scheduledAutoRunAt: message.payload.scheduledAt ?? null,
      });
      applyAutoRunStatus(message.payload);
      updateStatusDisplay(latestState);
      updateButtonStates();
      break;
    }
  }
});

// ============================================================
// Theme Toggle
// ============================================================

const btnTheme = document.getElementById('btn-theme');

function setTheme(theme) {
  document.documentElement.setAttribute('data-theme', theme);
  localStorage.setItem('multipage-theme', theme);
}

function initTheme() {
  const saved = localStorage.getItem('multipage-theme');
  if (saved) {
    setTheme(saved);
  } else if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
    setTheme('dark');
  }
}

btnTheme.addEventListener('click', () => {
  const current = document.documentElement.getAttribute('data-theme');
  setTheme(current === 'dark' ? 'light' : 'dark');
});

// ============================================================
// Init
// ============================================================

initializeManualStepActions();
initTheme();
updateSaveButtonState();
restoreState().then(() => {
  syncPasswordToggleLabel();
  syncVpsUrlToggleLabel();
  updateButtonStates();
  updateStatusDisplay(latestState);
});