/**
 * 获取波形预览组件的样式内容（纯 CSS，不包含 style 标签）
 */
export function getWaveformPreviewContent(): string {
  return `
      /* 波形预览组件样式 */
      .waveform-preview {
        margin-top: 12px;
        border: 1px solid var(--vscode-panel-border);
        border-radius: 8px;
        overflow: hidden;
        background: var(--vscode-editor-background);
      }
      .waveform-preview-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 10px 12px;
        background: var(--vscode-input-background);
        border-bottom: 1px solid var(--vscode-panel-border);
      }
      .waveform-preview-title {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 13px;
        font-weight: 500;
        color: var(--vscode-foreground);
      }
      .waveform-preview-title svg {
        width: 16px;
        height: 16px;
        color: var(--vscode-button-background);
      }
      .waveform-expand-btn {
        padding: 4px 12px;
        background: var(--vscode-button-background);
        color: var(--vscode-button-foreground);
        border: none;
        border-radius: 4px;
        cursor: pointer;
        font-size: 12px;
        display: flex;
        align-items: center;
        gap: 4px;
        transition: opacity 0.2s ease;
      }
      .waveform-expand-btn:hover {
        opacity: 0.9;
      }
      .waveform-expand-btn svg {
        width: 14px;
        height: 14px;
      }
      .waveform-preview-content {
        padding: 0;
        min-height: 200px;
        max-height: 300px;
        overflow: hidden;
        position: relative;
        background: var(--vscode-editor-background);
      }
      .waveform-preview-canvas {
        width: 100%;
        height: 100%;
        min-height: 200px;
      }
      .waveform-preview-placeholder {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        color: var(--vscode-descriptionForeground);
        font-size: 13px;
        text-align: center;
        padding: 20px;
      }
      .waveform-preview-placeholder svg {
        width: 48px;
        height: 48px;
        margin-bottom: 12px;
        opacity: 0.5;
      }
      .waveform-info {
        margin-top: 8px;
        font-size: 12px;
        color: var(--vscode-descriptionForeground);
      }
      .waveform-mini-viewer {
        width: 100%;
        height: 200px;
        background: var(--vscode-editor-background);
        position: relative;
        overflow: hidden;
      }
      .waveform-loading {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        color: var(--vscode-descriptionForeground);
        font-size: 12px;
      }
  `;
}

/**
 * 获取波形预览组件的 JavaScript 代码
 */
export function getWaveformPreviewScript(): string {
  return `
    /**
     * 创建波形预览组件
     */
    function createWaveformPreview(vcdFilePath, fileName) {
      const previewDiv = document.createElement('div');
      previewDiv.className = 'waveform-preview';

      // 头部
      const header = document.createElement('div');
      header.className = 'waveform-preview-header';

      const title = document.createElement('div');
      title.className = 'waveform-preview-title';
      title.innerHTML = \`
        <svg viewBox="0 0 1024 1024" xmlns="http://www.w3.org/2000/svg">
          <path d="M128 512h128l64-128 64 128 64-256 64 384 64-128h320"
                stroke="currentColor"
                stroke-width="64"
                fill="none"
                stroke-linecap="round"
                stroke-linejoin="round"/>
        </svg>
        <span>波形预览 - \${fileName}</span>
      \`;

      const expandBtn = document.createElement('button');
      expandBtn.className = 'waveform-expand-btn';
      expandBtn.innerHTML = \`
        <svg viewBox="0 0 1024 1024" xmlns="http://www.w3.org/2000/svg">
          <path d="M342 88.3h340c56.6 0 102.6 46 102.6 102.6v340c0 56.6-46 102.6-102.6 102.6H342c-56.6 0-102.6-46-102.6-102.6v-340c0-56.6 46-102.6 102.6-102.6z"
                fill="none"
                stroke="currentColor"
                stroke-width="48"/>
          <path d="M239.4 390.5v340c0 56.6 46 102.6 102.6 102.6h340"
                fill="none"
                stroke="currentColor"
                stroke-width="48"
                stroke-linecap="round"/>
        </svg>
        展开查看
      \`;
      expandBtn.onclick = () => openFullWaveform(vcdFilePath);

      header.appendChild(title);
      header.appendChild(expandBtn);

      // 内容区域 - 创建一个唯一ID的容器用于显示波形
      const content = document.createElement('div');
      content.className = 'waveform-preview-content';

      const miniViewerId = 'waveform-mini-' + Date.now();
      const miniViewer = document.createElement('div');
      miniViewer.id = miniViewerId;
      miniViewer.className = 'waveform-mini-viewer';

      // 添加加载提示
      const loadingDiv = document.createElement('div');
      loadingDiv.className = 'waveform-loading';
      loadingDiv.textContent = '正在加载波形预览...';
      miniViewer.appendChild(loadingDiv);

      content.appendChild(miniViewer);

      previewDiv.appendChild(header);
      previewDiv.appendChild(content);

      // 异步加载波形数据
      loadMiniWaveform(miniViewerId, vcdFilePath, loadingDiv);

      return previewDiv;
    }

    /**
     * 加载迷你波形预览
     */
    async function loadMiniWaveform(containerId, vcdFilePath, loadingDiv) {
      try {
        // 请求 VCD 文件信息
        vscode.postMessage({
          command: 'getVCDInfo',
          vcdFilePath: vcdFilePath,
          containerId: containerId
        });
      } catch (error) {
        console.error('加载波形预览失败:', error);
        loadingDiv.textContent = '波形预览加载失败';
        loadingDiv.style.color = 'var(--vscode-errorForeground)';
      }
    }

    /**
     * 渲染波形预览信息
     */
    function renderWaveformInfo(containerId, vcdInfo) {
      const container = document.getElementById(containerId);
      if (!container) return;

      // 清空容器
      container.innerHTML = '';

      // 绘制真实波形
      const waveformSvg = document.createElement('div');
      waveformSvg.innerHTML = drawRealWaveform(vcdInfo.signals || []);

      container.appendChild(waveformSvg);
    }

    /**
     * 绘制真实波形
     */
    function drawRealWaveform(signals) {
      if (!signals || signals.length === 0) {
        return \`
          <svg width="100%" height="80" viewBox="0 0 800 80" style="background: var(--vscode-editor-background);">
            <text x="400" y="40" fill="var(--vscode-descriptionForeground)" font-size="12" text-anchor="middle">
              无波形数据
            </text>
          </svg>
        \`;
      }

      const svgWidth = 800;
      const svgHeight = Math.max(80, signals.length * 30 + 20);
      const signalHeight = 20;
      const signalSpacing = 30;
      const leftMargin = 80;
      const rightMargin = 20;
      const waveformWidth = svgWidth - leftMargin - rightMargin;

      const colors = ['var(--vscode-charts-blue)', 'var(--vscode-charts-green)', 'var(--vscode-charts-orange)'];

      let svgContent = \`<svg width="100%" height="\${svgHeight}" viewBox="0 0 \${svgWidth} \${svgHeight}" style="background: var(--vscode-editor-background);">\`;

      // 绘制每个信号
      signals.forEach((signal, index) => {
        const y = 10 + index * signalSpacing;
        const color = colors[index % colors.length];

        // 绘制信号名称
        svgContent += \`<text x="5" y="\${y + signalHeight / 2 + 4}" fill="var(--vscode-foreground)" font-size="10" opacity="0.8">\${signal.name}</text>\`;

        // 如果没有值变化数据，显示提示
        if (!signal.values || signal.values.length === 0) {
          svgContent += \`<text x="\${leftMargin + waveformWidth / 2}" y="\${y + signalHeight / 2 + 4}" fill="var(--vscode-descriptionForeground)" font-size="9" text-anchor="middle" opacity="0.5">无数据</text>\`;
          return;
        }

        // 计算时间范围
        const times = signal.values.map(v => v.time);
        const minTime = Math.min(...times);
        const maxTime = Math.max(...times);
        const timeRange = maxTime - minTime || 1;

        // 绘制波形
        let pathData = '';
        let lastX = leftMargin;
        let lastValue = signal.values[0].value;

        signal.values.forEach((point, i) => {
          const x = leftMargin + ((point.time - minTime) / timeRange) * waveformWidth;
          const value = point.value;

          if (signal.width === 1) {
            // 单比特信号 - 绘制数字波形
            const yHigh = y;
            const yLow = y + signalHeight;
            const currentY = (value === '1') ? yHigh : yLow;

            if (i === 0) {
              pathData = \`M \${x} \${currentY}\`;
            } else {
              // 绘制垂直跳变
              const prevY = (lastValue === '1') ? yHigh : yLow;
              if (prevY !== currentY) {
                pathData += \` L \${x} \${prevY} L \${x} \${currentY}\`;
              } else {
                pathData += \` L \${x} \${currentY}\`;
              }
            }

            lastValue = value;
            lastX = x;
          } else {
            // 多比特信号 - 绘制总线波形（梯形）
            const yTop = y + 5;
            const yBottom = y + signalHeight - 5;
            const transitionWidth = 5;

            if (i === 0) {
              pathData = \`M \${x} \${yTop + (yBottom - yTop) / 2}\`;
            } else {
              // 绘制梯形过渡
              pathData += \` L \${x - transitionWidth} \${yTop} L \${x} \${yTop + (yBottom - yTop) / 2}\`;
            }

            lastX = x;
          }
        });

        // 延伸到右边界
        if (signal.width === 1) {
          const lastY = (lastValue === '1') ? y : (y + signalHeight);
          pathData += \` L \${leftMargin + waveformWidth} \${lastY}\`;
        } else {
          const yMid = y + signalHeight / 2;
          pathData += \` L \${leftMargin + waveformWidth} \${yMid}\`;
        }

        svgContent += \`<path d="\${pathData}" stroke="\${color}" stroke-width="1.5" fill="none"/>\`;
      });

      // 绘制时间轴
      const timeAxisY = svgHeight - 5;
      svgContent += \`<line x1="\${leftMargin}" y1="\${timeAxisY}" x2="\${leftMargin + waveformWidth}" y2="\${timeAxisY}" stroke="var(--vscode-foreground)" stroke-width="1" opacity="0.2"/>\`;

      svgContent += \`</svg>\`;

      return svgContent;
    }

    /**
     * 打开完整波形查看器
     */
    function openFullWaveform(vcdFilePath) {
      vscode.postMessage({
        command: 'openWaveformViewer',
        vcdFilePath: vcdFilePath
      });
    }

    /**
     * 在消息中添加波形预览
     */
    function addWaveformPreviewToMessage(messageDiv, vcdFilePath, fileName) {
      const preview = createWaveformPreview(vcdFilePath, fileName);
      messageDiv.appendChild(preview);
    }
  `;
}