"""
提取 Word 文档中所有样式的完整 XML 定义（不遗漏任何属性）。
同时提取编号格式定义（numbering.xml）以支持标题编号。
同时提取页面设置（页边距、纸张大小、方向、页眉页脚等）。
目标文件: default.docx
"""

import json
from pathlib import Path
from docx import Document
from docx.oxml.ns import qn
from lxml import etree
from zipfile import ZipFile

DOC_PATH = Path(__file__).parent / "default.docx"
OUTPUT_PATH = Path(__file__).parent / "default.json"


def emu_to_pt(emu) -> float | None:
    """EMU 转磅（1 pt = 12700 EMU）"""
    if emu is None:
        return None
    return round(int(emu) / 12700, 2)


def emu_to_twips(emu) -> int | None:
    """EMU 转 twips (1 twips = 635 EMU)"""
    if emu is None:
        return None
    return int(emu / 635)


def extract_font(style) -> dict | None:
    """通过 API 提取字体信息（作为便捷摘要）"""
    try:
        f = style.font
        color_rgb = None
        try:
            if f.color and f.color.type:
                color_rgb = str(f.color.rgb)
        except Exception:
            pass
        return {
            "name": f.name,
            "size_pt": emu_to_pt(f.size),
            "bold": f.bold,
            "italic": f.italic,
            "underline": f.underline,
            "color_rgb": color_rgb,
            "strike": f.strike,
            "all_caps": f.all_caps,
            "small_caps": f.small_caps,
        }
    except Exception:
        return None


def extract_paragraph_format(style) -> dict | None:
    """通过 API 提取段落格式（作为便捷摘要）"""
    try:
        pf = style.paragraph_format
        return {
            "alignment": str(pf.alignment) if pf.alignment else None,
            "left_indent_pt": emu_to_pt(pf.left_indent),
            "right_indent_pt": emu_to_pt(pf.right_indent),
            "first_line_indent_pt": emu_to_pt(pf.first_line_indent),
            "space_before_pt": emu_to_pt(pf.space_before),
            "space_after_pt": emu_to_pt(pf.space_after),
            "line_spacing": float(pf.line_spacing) if pf.line_spacing else None,
            "keep_together": pf.keep_together,
            "keep_with_next": pf.keep_with_next,
            "page_break_before": pf.page_break_before,
        }
    except Exception:
        return None


def element_to_dict(elem: etree._Element) -> dict | list | str | None:
    """
    将 lxml Element 转换为字典，完整保留标签、属性、文本和子元素。
    处理重复子元素（转为列表）。
    使用 '{namespace}localname' 格式作为标签名。
    """
    # 标签名（完整 Clark 表示法）
    tag = elem.tag

    # 属性字典
    attrib = dict(elem.attrib)

    # 子元素处理
    children = list(elem)
    if children:
        # 子元素可能重复，使用字典存储列表
        child_dict = {}
        for child in children:
            child_tag = child.tag
            child_val = element_to_dict(child)
            if child_tag in child_dict:
                # 相同标签名出现多次，转为列表
                if not isinstance(child_dict[child_tag], list):
                    child_dict[child_tag] = [child_dict[child_tag]]
                child_dict[child_tag].append(child_val)
            else:
                child_dict[child_tag] = child_val
        # 合并文本：如果存在文本（非空白），作为 '#text' 字段
        text = elem.text.strip() if elem.text else None
        tail = elem.tail.strip() if elem.tail else None
        result = {"@tag": tag, "@attrib": attrib, "@children": child_dict}
        if text:
            result["#text"] = text
        if tail:
            result["#tail"] = tail
        return result
    else:
        # 叶子节点：直接返回文本或属性+文本
        text = elem.text.strip() if elem.text else None
        tail = elem.tail.strip() if elem.tail else None
        if attrib or text or tail:
            result = {"@tag": tag, "@attrib": attrib}
            if text:
                result["#text"] = text
            if tail:
                result["#tail"] = tail
            return result
        else:
            # 完全空的元素，可简化为 None 但保持结构
            return {"@tag": tag, "@attrib": attrib}


def extract_style_full_xml(style) -> dict:
    """提取样式的完整 XML 定义（转换为字典）"""
    elem = style.element
    if elem is None:
        return None
    # 整个样式元素转换为字典
    style_dict = element_to_dict(elem)
    return style_dict


def extract_styles(doc_path: Path) -> list[dict]:
    doc = Document(str(doc_path))
    styles_data = []

    for style in doc.styles:
        info = {
            "name": style.name,
            "style_id": style.style_id,
            "type": str(style.type),
            "builtin": style.builtin,
            "hidden": style.hidden,
            "quick_style": style.quick_style,
            "priority": style.priority,
            "base_style": (
                style.base_style.name
                if hasattr(style, "base_style") and style.base_style
                else None
            ),
            "next_paragraph_style": (
                style.next_paragraph_style.name
                if hasattr(style, "next_paragraph_style") and style.next_paragraph_style
                else None
            ),
            "font_summary": extract_font(style),      # 便捷摘要
            "paragraph_format_summary": extract_paragraph_format(style),  # 便捷摘要
            "full_xml_definition": extract_style_full_xml(style)   # 完整原始定义
        }
        styles_data.append(info)

    return styles_data


def extract_numbering(doc_path: Path) -> dict | None:
    """
    提取 numbering.xml 的完整内容（编号格式定义）
    返回字典格式，如果文档中没有编号则返回 None
    """
    try:
        with ZipFile(str(doc_path), 'r') as docx_zip:
            # 尝试读取 numbering.xml
            try:
                numbering_xml = docx_zip.read('word/numbering.xml')
            except KeyError:
                # 文档中没有编号定义
                return None
            
            # 解析 XML 并转换为字典
            root = etree.fromstring(numbering_xml)
            numbering_dict = element_to_dict(root)
            return numbering_dict
    except Exception as e:
        print(f"警告: 提取编号格式失败: {e}")
        return None


def infer_paper_size(width_twips: int, height_twips: int) -> str:
    """根据页面尺寸推断纸张类型"""
    # 常见纸张尺寸（twips）
    # A4 (纵向): 210mm x 297mm = 11906 x 16838 twips
    # A4 (横向): 297mm x 210mm = 16838 x 11906 twips
    # Letter (纵向): 8.5" x 11" = 12240 x 15840 twips
    # A3 (纵向): 297mm x 420mm = 16838 x 23811 twips
    
    # 允许 ±100 twips 的误差
    tolerance = 100
    
    # A4 纵向
    if abs(width_twips - 11906) < tolerance and abs(height_twips - 16838) < tolerance:
        return "A4"
    # A4 横向
    elif abs(width_twips - 16838) < tolerance and abs(height_twips - 11906) < tolerance:
        return "A4 (Landscape)"
    # Letter 纵向
    elif abs(width_twips - 12240) < tolerance and abs(height_twips - 15840) < tolerance:
        return "Letter"
    # A3 纵向
    elif abs(width_twips - 16838) < tolerance and abs(height_twips - 23811) < tolerance:
        return "A3"
    else:
        return "Custom"


def extract_page_setup(doc_path: Path) -> dict:
    """
    提取页面设置信息（页边距、纸张大小、方向、页眉页脚等）
    只提取第一个节(section)的设置（大多数文档只有一个节）
    """
    try:
        doc = Document(str(doc_path))
        
        # 检查是否有 section
        if not doc.sections:
            return {"sections": []}
        
        # 只提取第一个 section
        section = doc.sections[0]
        sections_data = []
        # 提取页边距（转换为 twips）
        top_margin = emu_to_twips(section.top_margin)
        bottom_margin = emu_to_twips(section.bottom_margin)
        left_margin = emu_to_twips(section.left_margin)
        right_margin = emu_to_twips(section.right_margin)
        gutter = emu_to_twips(section.gutter)
        
        # 提取纸张尺寸（转换为 twips）
        page_width = emu_to_twips(section.page_width)
        page_height = emu_to_twips(section.page_height)
        
        # 提取方向
        # orientation: 0 = PORTRAIT, 1 = LANDSCAPE
        orientation = "portrait" if section.orientation == 0 else "landscape"
        
        # 提取页眉页脚距离（转换为 twips）
        header_distance = emu_to_twips(section.header_distance)
        footer_distance = emu_to_twips(section.footer_distance)
        
        # 提取首页不同设置
        different_first_page = section.different_first_page_header_footer
        
        # 从 XML 提取文档网格设置
        # 注意：需要通过 section._sectPr 访问 XML 元素
        grid_type = None
        chars_per_line = None
        lines_per_page = None
        
        try:
            # 尝试获取 section 的 XML 元素
            if hasattr(section, '_sectPr'):
                sectPr = section._sectPr
            elif hasattr(section, 'element'):
                sectPr = section.element
            else:
                sectPr = None
            
            if sectPr is not None:
                docGrid = sectPr.find(qn('w:docGrid'))
                
                if docGrid is not None:
                    # 网格类型: default, lines, linesAndChars, snapToChars
                    grid_type = docGrid.get(qn('w:type'))
                    
                    # linePitch: 每行的高度（用于计算行数）
                    # charSpace: 字符间距
                    line_pitch = docGrid.get(qn('w:linePitch'))
                    char_space = docGrid.get(qn('w:charSpace'))
                    
                    # 注意：Word UI 显示的"每页行数"对应 linePitch
                    # "每行字符数"对应 charSpace
                    if line_pitch:
                        lines_per_page = int(line_pitch)
                    if char_space:
                        chars_per_line = int(char_space)
        except Exception as e:
            # 如果提取网格失败，继续（网格不是必需的）
            pass
        
        # 推断纸张大小
        paper_size_inferred = infer_paper_size(page_width, page_height)
        
        section_data = {
            # 页边距（twips）
            "top_margin": top_margin,
            "bottom_margin": bottom_margin,
            "left_margin": left_margin,
            "right_margin": right_margin,
            "gutter": gutter,
            
            # 纸张（twips）
            "page_width": page_width,
            "page_height": page_height,
            "orientation": orientation,
            
            # 版式（twips）
            "header_distance": header_distance,
            "footer_distance": footer_distance,
            "different_first_page": different_first_page,
            
            # 文档网格（可选）
            "grid_type": grid_type,
            "chars_per_line": chars_per_line,
            "lines_per_page": lines_per_page,
            
            # 推断信息
            "paper_size_inferred": paper_size_inferred,
        }
        
        sections_data.append(section_data)
        
        return {
            "sections": sections_data
        }
        
    except Exception as e:
        print(f"警告: 提取页面设置失败: {e}")
        import traceback
        traceback.print_exc()
        return {
            "sections": []
        }


def main():
    print(f"读取文件: {DOC_PATH}")
    if not DOC_PATH.exists():
        raise FileNotFoundError(f"文件不存在: {DOC_PATH}")

    # 提取样式
    styles_data = extract_styles(DOC_PATH)
    
    # 提取编号格式
    numbering_data = extract_numbering(DOC_PATH)
    
    # 提取页面设置
    page_setup_data = extract_page_setup(DOC_PATH)

    result = {
        "source_file": DOC_PATH.name,
        "total_styles": len(styles_data),
        "styles": styles_data,
        "numbering": numbering_data,  # 编号格式定义
        "page_setup": page_setup_data,  # 页面设置
    }

    OUTPUT_PATH.write_text(
        json.dumps(result, ensure_ascii=False, indent=2),
        encoding="utf-8",
    )

    print(f"共提取 {len(styles_data)} 个样式")
    if numbering_data:
        print(f"✅ 已提取编号格式定义")
    else:
        print(f"ℹ️  文档中没有编号格式")
    
    # 打印页面设置摘要
    if page_setup_data and page_setup_data.get("sections"):
        section = page_setup_data["sections"][0]
        print(f"✅ 已提取页面设置:")
        print(f"   - 纸张: {section.get('paper_size_inferred')} ({section.get('orientation')})")
        print(f"   - 页边距: 上{section.get('top_margin')} 下{section.get('bottom_margin')} "
              f"左{section.get('left_margin')} 右{section.get('right_margin')} twips")
        if section.get('grid_type'):
            print(f"   - 文档网格: {section.get('grid_type')} "
                  f"(每行{section.get('chars_per_line')}字符, 每页{section.get('lines_per_page')}行)")
    
    print(f"完整定义已保存至: {OUTPUT_PATH}")

    # 打印样式类型分布
    by_type: dict[str, list[str]] = {}
    for s in styles_data:
        t = s["type"]
        by_type.setdefault(t, []).append(s["name"])

    print("\n--- 样式类型分布 ---")
    for t, names in by_type.items():
        print(f"  {t}: {len(names)} 个")


if __name__ == "__main__":
    main()