#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""页码 CSS 生成"""
from typing import Any, Dict


def _resolve_page_number_config(config: Dict[str, Any]) -> Dict[str, Any]:
    """从模板 JSON 解析页码配置"""
    show = config.get("showPageNumber")
    if show is None:
        show = config.get("show_page_number", True)
    return {
        "show": bool(show),
        "position": config.get("pageNumberPosition", "footer"),
        "align": config.get("pageNumberAlign", "center"),
        "format": config.get("pageNumberFormat", "chinese"),
        "font_size": config.get("pageNumberFontSize", 10),
        "color": config.get("pageNumberColor", "#666666"),
    }


def build_page_number_css(config: Dict[str, Any]) -> str:
    """生成 WeasyPrint @page 页码 margin 规则"""
    cfg = _resolve_page_number_config(config)
    if not cfg["show"]:
        return ""

    edge = "top" if cfg["position"] == "header" else "bottom"
    margin_box = f"{edge}-{cfg['align']}"

    fmt = cfg["format"]
    if fmt == "fraction":
        content = 'counter(page) " / " counter(pages)'
    elif fmt == "english":
        content = '"Page " counter(page) " of " counter(pages)'
    else:
        content = '"第 " counter(page) " 页 / 共 " counter(pages) " 页"'

    return f"""
        @{margin_box} {{
            content: {content};
            font-size: {float(cfg['font_size'])}pt;
            color: {cfg['color']};
        }}"""