# ============================================================
# 演示手卡 Markdown → PDF（A4，CJK 字体，reportlab 轻量渲染）
# 用法: python demo-data/md_handout_to_pdf.py 输入.md 输出.pdf
# ============================================================
from __future__ import annotations

import re
import sys
from pathlib import Path

from reportlab.lib import colors
from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import ParagraphStyle
from reportlab.lib.units import mm
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont
from reportlab.platypus import (
    Paragraph,
    SimpleDocTemplate,
    Spacer,
    Table,
    TableStyle,
)

FONT_DIR = Path(sys.executable).parent.parent.parent / "fonts"
pdfmetrics.registerFont(TTFont("NotoSC", str(FONT_DIR / "NotoSansSC-Regular.ttf")))
pdfmetrics.registerFont(TTFont("NotoSC-B", str(FONT_DIR / "NotoSansSC-Bold.ttf")))
pdfmetrics.registerFontFamily("NotoSC", normal="NotoSC", bold="NotoSC-B", italic="NotoSC", boldItalic="NotoSC-B")

H1 = ParagraphStyle("h1", fontName="NotoSC-B", fontSize=15, leading=20, spaceAfter=4, textColor=colors.HexColor("#1a3a6b"))
H2 = ParagraphStyle("h2", fontName="NotoSC-B", fontSize=11.5, leading=16, spaceBefore=7, spaceAfter=3, textColor=colors.HexColor("#1a3a6b"))
BODY = ParagraphStyle("body", fontName="NotoSC", fontSize=8.8, leading=13.2, spaceAfter=2)
QUOTE = ParagraphStyle("quote", parent=BODY, leftIndent=8, textColor=colors.HexColor("#666666"), fontSize=8.2, leading=12)
CELL = ParagraphStyle("cell", fontName="NotoSC", fontSize=8.2, leading=11.5)
CELL_B = ParagraphStyle("cellb", parent=CELL, fontName="NotoSC-B", textColor=colors.white)


def inline(text: str) -> str:
    text = text.replace("&", "&amp;").replace("<", "&lt;").replace(">", "&gt;")
    text = re.sub(r"\*\*(.+?)\*\*", r'<font name="NotoSC-B">\1</font>', text)
    text = re.sub(r"`(.+?)`", r'<font name="NotoSC" color="#8a4b08">\1</font>', text)
    return text


def render(md: str) -> list:
    flow = []
    lines = md.splitlines()
    i = 0
    while i < len(lines):
        line = lines[i].rstrip()
        if not line.strip():
            i += 1
            continue
        if line.startswith("# "):
            flow.append(Paragraph(inline(line[2:]), H1))
        elif line.startswith("## "):
            flow.append(Paragraph(inline(line[3:]), H2))
        elif line.startswith("> "):
            flow.append(Paragraph(inline(line[2:]), QUOTE))
        elif line.startswith("- "):
            flow.append(Paragraph("· " + inline(line[2:]), BODY))
        elif line.startswith("|"):
            rows = []
            while i < len(lines) and lines[i].strip().startswith("|"):
                cells = [c.strip() for c in lines[i].strip().strip("|").split("|")]
                if not all(re.fullmatch(r":?-{2,}:?", c or "---") for c in cells):
                    rows.append(cells)
                i += 1
            i -= 1
            if rows:
                ncol = max(len(r) for r in rows)
                data = []
                for ri, r in enumerate(rows):
                    st = CELL_B if ri == 0 else CELL
                    data.append([Paragraph(inline(c), st) for c in r] + [""] * (ncol - len(r)))
                page_w = A4[0] - 24 * mm
                weights = [max((len(str(c)) for c in col), default=4) for col in zip(*[list(r) + [""] * (ncol - len(r)) for r in rows])]
                total = sum(weights) or 1
                widths = [max(page_w * w / total, 40) for w in weights]  # 窄列保底 40pt
                scale = page_w / sum(widths)
                tbl = Table(data, colWidths=[w * scale for w in widths])
                tbl.setStyle(TableStyle([
                    ("BACKGROUND", (0, 0), (-1, 0), colors.HexColor("#1a3a6b")),
                    ("ROWBACKGROUNDS", (0, 1), (-1, -1), [colors.white, colors.HexColor("#f2f5fa")]),
                    ("GRID", (0, 0), (-1, -1), 0.4, colors.HexColor("#c9d3e0")),
                    ("VALIGN", (0, 0), (-1, -1), "TOP"),
                    ("TOPPADDING", (0, 0), (-1, -1), 2.5),
                    ("BOTTOMPADDING", (0, 0), (-1, -1), 2.5),
                    ("LEFTPADDING", (0, 0), (-1, -1), 4),
                    ("RIGHTPADDING", (0, 0), (-1, -1), 4),
                ]))
                flow.append(tbl)
                flow.append(Spacer(1, 3))
        else:
            flow.append(Paragraph(inline(line), BODY))
        i += 1
    return flow


def main() -> None:
    src, dst = Path(sys.argv[1]), Path(sys.argv[2])
    doc = SimpleDocTemplate(str(dst), pagesize=A4,
                            leftMargin=12 * mm, rightMargin=12 * mm,
                            topMargin=11 * mm, bottomMargin=11 * mm,
                            title="锐扬 APS 智能体 · 演示手卡")
    doc.build(render(src.read_text(encoding="utf-8")))
    print(f"PDF 已生成: {dst}")


if __name__ == "__main__":
    main()