'use strict';

(function () {
  const state = {
    initialized: false,
    loading: false,
    root: '',
    tasks: [],
    filter: 'all',
    timer: null,
  };

  const STATUS_LABELS = {
    queued: '排队中',
    submitted: '已提交',
    running: '进行中',
    success: '已完成',
    failed: '失败',
    canceled: '已取消',
    timeout: '已超时',
  };
  const KIND_LABELS = {
    logo: 'LOGO',
    banner: '海报',
    signage: '招牌',
    sticker: '贴纸',
    dish: '菜品',
  };

  function el(tag, className, text) {
    const node = document.createElement(tag);
    if (className) node.className = className;
    if (text !== undefined) node.textContent = text;
    return node;
  }

  function formatTime(value) {
    if (!value) return '';
    const date = new Date(value);
    const pad = (n) => String(n).padStart(2, '0');
    return `${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${pad(date.getHours())}:${pad(date.getMinutes())}:${pad(date.getSeconds())}`;
  }

  function formatBytes(size) {
    if (!Number.isFinite(size) || size <= 0) return '';
    if (size < 1024 * 1024) return `${Math.round(size / 1024)} KB`;
    return `${(size / 1024 / 1024).toFixed(1)} MB`;
  }

  function progressValue(task) {
    const parsed = Number.parseInt(String(task.progress || '').replace(/[^\d]/g, ''), 10);
    if (task.status === 'success') return 100;
    if (Number.isFinite(parsed)) return Math.min(100, Math.max(0, parsed));
    return task.status === 'queued' ? 0 : 35;
  }

  function getFilteredTasks() {
    if (state.filter === 'all') return state.tasks;
    if (state.filter === 'running') {
      return state.tasks.filter((task) => task.status === 'running' || task.status === 'submitted');
    }
    return state.tasks.filter((task) => task.status === state.filter);
  }

  function setCount(id, value) {
    document.getElementById(id).textContent = String(value || 0);
  }

  function renderSummary() {
    const counts = { all: 0, running: 0, queued: 0, success: 0, failed: 0 };
    state.tasks.forEach((task) => {
      counts.all += 1;
      if (task.status === 'running' || task.status === 'submitted') counts.running += 1;
      else if (task.status === 'queued') counts.queued += 1;
      else if (task.status === 'success') counts.success += 1;
      else if (task.status === 'failed' || task.status === 'timeout') counts.failed += 1;
    });
    setCount('taskCountAll', counts.all);
    setCount('taskCountRunning', counts.running);
    setCount('taskCountQueued', counts.queued);
    setCount('taskCountSuccess', counts.success);
    setCount('taskCountFailed', counts.failed);
    document.getElementById('taskSummary').textContent = state.loading
      ? '正在加载任务…'
      : `共 ${counts.all} 个任务 · ${counts.running} 个进行中 · ${counts.failed} 个失败`;
  }

  function buildTaskCard(task) {
    const card = el('article', `task-card status-${task.status}`);
    const main = el('div', 'task-main');

    const titleRow = el('div', 'task-title-row');
    const title = el('div', 'task-title');
    title.textContent = `${task.shopName || '未知门店'} · ${KIND_LABELS[task.kind] || task.name || task.kind}`;
    const badge = el('span', `badge task-badge ${task.status}`);
    badge.textContent = STATUS_LABELS[task.status] || task.status;
    titleRow.append(title, badge);

    const meta = el('div', 'task-meta');
    meta.textContent = [
      task.model || '默认模型',
      formatTime(task.createdAt),
      task.cost !== null && task.cost !== undefined ? `费用 ${task.cost}` : '',
      task.providerTaskId ? `任务 ${String(task.providerTaskId).slice(0, 10)}…` : '',
    ].filter(Boolean).join(' · ');

    const progress = el('div', 'task-progress');
    const bar = el('span', 'task-progress-bar');
    bar.style.width = `${progressValue(task)}%`;
    progress.appendChild(bar);

    main.append(titleRow, progress, meta);
    if (task.warning) main.appendChild(el('div', 'task-notice warning', task.warning));
    if (task.error) main.appendChild(el('div', 'task-notice error', task.error));

    const actions = el('div', 'task-actions');
    const right = el('div', 'task-status-detail');
    right.textContent = `${task.progress || progressValue(task) + '%'}${task.fileSizeBytes ? ` · ${formatBytes(task.fileSizeBytes)}` : ''}`;
    actions.appendChild(right);
    if (task.resultUrl) {
      const open = el('a', 'btn btn-ghost btn-small', '查看结果');
      open.href = task.resultUrl;
      open.target = '_blank';
      open.rel = 'noopener noreferrer';
      actions.appendChild(open);
    }

    card.append(main, actions);
    return card;
  }

  function renderTasks() {
    const list = document.getElementById('taskList');
    const tasks = getFilteredTasks();
    list.innerHTML = '';
    list.classList.toggle('empty', tasks.length === 0);
    if (!tasks.length) {
      const empty = el('div', 'task-empty');
      const icon = el('div', 'task-empty-icon');
      icon.innerHTML = '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.4" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M4 7h10M4 12h16M4 17h7"/><circle cx="18" cy="7" r="2"/><circle cx="15" cy="17" r="2"/></svg>';
      const text = el('p', '', state.loading ? '正在加载任务' : '暂无匹配任务');
      const help = el('small', '', state.loading ? '请稍候' : '提交生成任务后会自动显示在这里');
      empty.append(icon, text, help);
      list.appendChild(empty);
      return;
    }
    tasks.forEach((task) => list.appendChild(buildTaskCard(task)));
  }

  function render() {
    renderSummary();
    renderTasks();
  }

  async function loadTasks() {
    if (state.loading) return;
    state.loading = true;
    render();
    try {
      if (!state.root) {
        const rootResponse = await fetch('/api/default-root');
        const rootData = await rootResponse.json();
        state.root = rootData.root;
      }
      const url = `/api/tasks?root=${encodeURIComponent(state.root)}`;
      const response = await fetch(url);
      const data = await response.json();
      if (!response.ok) throw new Error(data.error || '任务列表加载失败');
      state.tasks = data.tasks || [];
    } catch (error) {
      state.tasks = [];
      document.getElementById('taskSummary').textContent = error.message;
    } finally {
      state.loading = false;
      render();
    }
  }

  function bindEvents() {
    document.getElementById('btnRefreshTasks').addEventListener('click', loadTasks);
    document.getElementById('taskFilters').addEventListener('click', (event) => {
      const button = event.target.closest('[data-filter]');
      if (!button) return;
      state.filter = button.dataset.filter;
      document.querySelectorAll('#taskFilters .history-filter').forEach((item) => {
        item.classList.toggle('active', item === button);
      });
      renderTasks();
    });
  }

  window.shanTasksInit = function () {
    if (!state.initialized) {
      state.initialized = true;
      bindEvents();
    }
    loadTasks();
    if (!state.timer) {
      state.timer = setInterval(() => {
        if (document.getElementById('viewTasks').classList.contains('active')) loadTasks();
      }, 3000);
    }
  };
})();