"""HTML 预览生成服务"""
from typing import List, Dict, Any


def generate_preview_html(blocks: List[Dict[str, Any]]) -> str:
    """
    将 block 列表转为带 data-block-id 的 HTML 预览字符串。
    每个元素都会带上 data-block-id 属性供前端点击交互。
    """
    html_parts = ['<div class="doc-preview-content">']

    for block in blocks:
        block_id = block.get("block_id", "")
        block_type = block.get("type", "")
        text = block.get("text", "")

        if block_type == "heading":
            html = f'<h2 data-block-id="{block_id}" style="font-size:16px;font-weight:600;margin:20px 0 10px;padding-bottom:6px;border-bottom:2px solid #1a1d24">{text}</h2>'
        elif block_type == "table":
            html = f'<div data-block-id="{block_id}" style="margin:12px 0;padding:8px;background:#f7f8fa;border:1px dashed #ccc;border-radius:4px;color:#5b626e">📊 {text[:80]}</div>'
        else:
            html = f'<p data-block-id="{block_id}" style="text-indent:2em;margin:8px 0;line-height:1.8;text-align:justify">{text}</p>'

        html_parts.append(html)

    html_parts.append('</div>')
    return "\n".join(html_parts)