/* DCTS Dashboard Workflows Component */

import { escapeHtml } from '../utils/format.js';
import { ICONS } from '../utils/icons.js';

/** 工作流卡片骨架：纯展示卡（名称/描述/状态/进度）。
 *
 * 卡片下方的「YAML配置/启动/暂停/删除」按钮已移除（见 docs/task_engine_decoupling_design.md
 * §6.1）。所有操作（启动/停止/删除/保存配置）收敛至工作流详情页顶部的内嵌阶段配置面板
 * （wfEnginePanel.js）。首页卡片仅作状态概览与入口。 */
function buildCardSkeleton({ name, href, desc, statusCn, statusClass, hasProgress, pct, countsText }) {
  return `
    <a class="wf-card-link" href="${href}" title="进入工作流详情">
      <div class="workflow-header">
        <div>
          <h3 class="workflow-name">${name}</h3>
          <p class="workflow-desc">${desc}</p>
        </div>
        <span class="status-badge ${statusClass}" data-wf-badge>${statusCn}</span>
      </div>
      <div class="wf-card-progress${hasProgress ? '' : ' hidden'}" data-wf-progress>
        <div class="progress-bar-track" aria-hidden="true">
          <div class="progress-bar-fill progress-fill-emerald" data-wf-fill style="width: ${pct}%"></div>
        </div>
        <span class="wf-card-counts tabular-num" data-wf-counts>${countsText}</span>
      </div>
    </a>
  `;
}

/** 原位更新卡片易变部分：状态徽章 / 进度条宽度 / 计数文本。 */
function updateCardInPlace(card, { statusCn, statusClass, hasProgress, pct, countsText }) {
  // 状态徽章
  const badge = card.querySelector('[data-wf-badge]');
  if (badge) {
    if (badge.textContent !== statusCn) badge.textContent = statusCn;
    if (!badge.classList.contains(statusClass)) {
      badge.className = `status-badge ${statusClass}`;
      badge.setAttribute('data-wf-badge', '');
    }
  }
  // 进度条
  const progWrap = card.querySelector('[data-wf-progress]');
  if (progWrap) {
    const shouldShow = hasProgress;
    const isHidden = progWrap.classList.contains('hidden');
    if (shouldShow && isHidden) progWrap.classList.remove('hidden');
    else if (!shouldShow && !isHidden) progWrap.classList.add('hidden');
    if (shouldShow) {
      const fill = progWrap.querySelector('[data-wf-fill]');
      const wStr = `${pct}%`;
      if (fill && fill.style.width !== wStr) fill.style.width = wStr;
      const counts = progWrap.querySelector('[data-wf-counts]');
      if (counts && counts.textContent !== countsText) counts.textContent = countsText;
    }
  }
}

export function renderWorkflowsSkeleton() {
  const container = document.getElementById('workflows-list');
  if (!container) return;

  container.innerHTML = Array.from({ length: 2 }).map(() => `
    <div class="workflow-card skeleton-card">
      <div class="workflow-header">
        <div>
          <div class="skeleton-shimmer skeleton-w-140 skeleton-h-18"></div>
          <div class="skeleton-shimmer skeleton-w-220 skeleton-h-14"></div>
        </div>
        <div class="skeleton-shimmer skeleton-badge"></div>
      </div>
      <div class="wf-card-progress">
        <div class="skeleton-shimmer skeleton-w-full skeleton-h-8"></div>
      </div>
    </div>
  `).join('');
}

export function renderWorkflows(workflows) {
  const container = document.getElementById('workflows-list');
  const wfMetric = document.getElementById('val-total-workflows');
  const wfSub = document.getElementById('val-active-wf');
  if (!container) return;

  if (wfMetric) wfMetric.textContent = workflows ? workflows.length : 0;

  if (!workflows || workflows.length === 0) {
    if (wfSub) wfSub.textContent = '暂无已注册工作流';
    const emptyHtml = `
      <div class="empty-state-box">
        ${ICONS.layers({ size: 36, cls: 'empty-state-icon' })}
        <p>暂无恒星大气网格工作流配置</p>
        <button type="button" class="btn btn-primary btn-sm" data-wf-action="create-first">
          ${ICONS.plus({ size: 14 })}
          注册第一个工作流
        </button>
      </div>
    `;
    if (container.innerHTML.trim() !== emptyHtml.trim()) {
      container.innerHTML = emptyHtml;
    }
    return;
  }

  const runningCount = workflows.filter(w => w.status === 'running').length;
  if (wfSub) {
    wfSub.textContent = runningCount > 0 ? `${runningCount} 个工作流运行中` : '集群待命';
  }

  const existingCards = new Map();
  container.querySelectorAll('.workflow-card[data-wf-card-name]').forEach(card => {
    existingCards.set(card.getAttribute('data-wf-card-name'), card);
  });

  if (container.querySelector('.skeleton-card, .empty-cell')) {
    container.innerHTML = '';
    existingCards.clear();
  }

  const updatedCards = [];

  workflows.forEach(wf => {
    // 状态徽章全映射：后端可发 idle/initializing/running/paused/completed
    let statusCn = '闲置';
    let statusClass = 'secondary';
    if (wf.status === 'running') {
      statusCn = '运行中';
      statusClass = 'online';
    } else if (wf.status === 'completed') {
      statusCn = '已完成';
      statusClass = 'completed';
    } else if (wf.status === 'initializing') {
      statusCn = '初始化中';
      statusClass = 'warning';
    } else if (wf.status === 'paused') {
      statusCn = '已暂停';
      statusClass = 'secondary';
    }

    const name = escapeHtml(wf.name);
    const href = `#/workflows/${encodeURIComponent(wf.name)}`;
    const desc = escapeHtml(wf.description || '无描述');

    // 内联进度（来自列表接口内联 stats；未启动的工作流 stats=null → 不渲染）
    const s = wf.stats;
    const hasProgress = s && s.total > 0;
    const pct = hasProgress ? Math.min(100, Math.max(0, Math.round((s.converged / s.total) * 100))) : 0;
    const countsText = hasProgress
      ? `${s.converged}/${s.total} 收敛 · ${s.seed_step_converged} 种子步进 · ${s.failed} 失败 · ${s.running} 运行`
      : '';

    let card = existingCards.get(name);
    if (card) {
      // 原位更新：状态徽章 / 进度条 / 计数文本——各自 diff，避免整卡 innerHTML 重建
      updateCardInPlace(card, { statusCn, statusClass, hasProgress, pct, countsText });
      existingCards.delete(name);
    } else {
      card = document.createElement('div');
      card.className = 'workflow-card';
      card.setAttribute('data-wf-card-name', name);
      card.innerHTML = buildCardSkeleton({ name, href, desc, statusCn, statusClass, hasProgress, pct, countsText });
    }
    updatedCards.push(card);
  });

  existingCards.forEach(card => card.remove());

  updatedCards.forEach((card, idx) => {
    if (container.children[idx] !== card) {
      container.insertBefore(card, container.children[idx] || null);
    }
  });
}