"""Build the HTML and PDF versions of the report from ``report/paper.md``.

Run on a machine that has WeasyPrint and a CJK font installed::

    python scripts/build_report.py

The HTML is self-contained apart from the figure files (``report/figures/``),
so it can be opened directly in a browser or printed to PDF by hand.
"""
from __future__ import annotations

import shutil
import sys
from pathlib import Path

import markdown
from weasyprint import CSS, HTML

ROOT = Path(__file__).resolve().parents[1]
REPORT = ROOT / "report"
SRC = REPORT / "paper.md"
OUT_HTML = REPORT / "paper.html"
OUT_PDF = REPORT / "paper.pdf"
FIG_SRC = ROOT / "results" / "figures"
FIG_DST = REPORT / "figures"

# The text uses LaTeX only inside the first sections; converting those few
# expressions to Unicode keeps the PDF readable without a JS math renderer.
MATH = {
    r"$\mathrm{m^{-2}}$": "m⁻²",
    r"$10^{16}\,\mathrm{m^{-2}}$": "10¹⁶ m⁻²",
    r"$5\times10^{-4}$": "5×10⁻⁴",
    r"$33\times401=13233$": "33 × 401 = 13233",
    r"$T=401$": "T = 401",
    r"$R^2=1$": "R² = 1",
    r"$R^2=0$": "R² = 0",
    r"$R^2<0$": "R² < 0",
    r"$\sigma$": "σ",
    r"$c$": "c",
    r"$\delta$": "δ",
    r"$\chi$": "χ",
    r"$\Delta H_{\mathrm{mix}}$": "ΔH_mix",
    r"$\Delta S_{\mathrm{mix}}$": "ΔS_mix",
    r"$\rho_{\mathrm{total}}$": "ρ_total",
    r"$\rho_{\mathrm{twin}}$": "ρ_twin",
    r"$\varepsilon_{1:T}$": "ε(1..T)",
    r"$\xi_{\mathrm{BCC}}, \xi_{\mathrm{FCC}}, \xi_{\mathrm{HCP}}, \xi_{\mathrm{other}}$":
        "ξ_BCC, ξ_FCC, ξ_HCP, ξ_other",
    r"$\rho_{1/2},\rho_{a/2},\rho_{a/3},\rho_{\mathrm{edge}},\rho_{\mathrm{screw}},\rho_{\mathrm{perfect}},\rho_{\mathrm{other}}$":
        "ρ_1/2, ρ_a/2, ρ_a/3, ρ_edge, ρ_screw, ρ_perfect, ρ_other",
}

CSS_TEXT = r"""
@page {
  size: A4;
  margin: 20mm 18mm 18mm 18mm;
  @bottom-center {
    content: counter(page);
    font-family: "Noto Serif CJK SC", serif;
    font-size: 9pt;
    color: #555;
  }
  @top-center {
    content: string(doctitle);
    font-family: "Noto Serif CJK SC", serif;
    font-size: 8.5pt;
    color: #777;
  }
}
@page :first { @top-center { content: none; } }

html { font-size: 10.5pt; }
body {
  font-family: "Noto Serif CJK SC", "Songti SC", serif;
  line-height: 1.78;
  color: #111;
  text-align: left;
  max-width: 820px;
  margin: 0 auto;
  padding: 0 8px;
}
h1 {
  font-size: 19pt; line-height: 1.45; text-align: center;
  margin: 0 0 6px 0; font-weight: 700; string-set: doctitle content();
}
h2 {
  font-size: 13.5pt; margin: 22px 0 8px 0; font-weight: 700;
  border-bottom: 1.2px solid #333; padding-bottom: 3px;
  page-break-after: avoid;
}
h3 { font-size: 11.5pt; margin: 16px 0 6px 0; font-weight: 700; page-break-after: avoid; }
p { margin: 0 0 8px 0; text-indent: 2em; }
p.eq { text-align: center; text-indent: 0; margin: 9px 0 11px 0; }
p.eq sub, td sub { font-size: 68%; }
p:has(> img) { text-indent: 0; text-align: center; margin: 12px 0 4px 0; }
img { max-width: 96%; height: auto; }
table {
  border-collapse: collapse; width: 100%; margin: 10px 0 6px 0;
  font-size: 8.6pt; line-height: 1.45; page-break-inside: avoid;
  break-before: avoid;  /* keep the caption above the table on the same page */
}
th, td { border: 0.5pt solid #999; padding: 3px 5px; text-align: center; vertical-align: middle; }
th { background: #f0f0f0; font-weight: 700; }
td:first-child, th:first-child { text-align: left; }
tr:nth-child(even) td { background: #fafafa; }
code { font-family: "DejaVu Sans Mono", monospace; font-size: 8.6pt; background: #f4f4f4; padding: 0 2px; }
pre {
  background: #f6f6f6; border: 0.5pt solid #ddd; padding: 6px 8px;
  font-size: 8.2pt; line-height: 1.4; white-space: pre-wrap; page-break-inside: avoid;
}
pre code { background: none; }
blockquote { margin: 8px 0; padding-left: 10px; border-left: 3px solid #ccc; color: #444; }
hr { border: none; border-top: 0.6pt solid #ccc; margin: 16px 0; }
strong { font-weight: 700; }
#TOC { background: #f7f7f7; border: 0.5pt solid #ddd; padding: 8px 14px; margin: 14px 0 18px 0; }
#TOC ul { margin: 2px 0; padding-left: 18px; }
#TOC li { margin: 1px 0; font-size: 9.2pt; }
#TOC a { color: #111; text-decoration: none; }
a { color: #1a4f8b; text-decoration: none; }
"""

TEMPLATE = """<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title>{title}</title>
<style>{css}</style>
</head>
<body>
{body}
</body>
</html>
"""


def main() -> int:
    if not SRC.exists():
        print(f"missing {SRC}")
        return 1
    text = SRC.read_text(encoding="utf-8")
    for k, v in MATH.items():
        text = text.replace(k, v)
    left = text.count("$")
    if left:
        print(f"warning: {left} '$' characters remain (unconverted LaTeX?)")
    body = markdown.markdown(
        text, extensions=["tables", "fenced_code", "toc", "sane_lists"],
        extension_configs={"toc": {"title": "目录", "toc_depth": "2-2"}})
    doc = TEMPLATE.format(title="多合金 MD 轨迹的应力–应变预测", css=CSS_TEXT, body=body)
    OUT_HTML.write_text(doc, encoding="utf-8")

    if FIG_SRC.exists():
        FIG_DST.mkdir(exist_ok=True)
        for f in FIG_SRC.glob("*.png"):
            shutil.copy2(f, FIG_DST / f.name)

    HTML(string=doc, base_url=str(REPORT)).write_pdf(
        str(OUT_PDF), stylesheets=[CSS(string=CSS_TEXT)])
    print(f"html {OUT_HTML.stat().st_size/1024:.0f} KB, "
          f"pdf {OUT_PDF.stat().st_size/1024:.0f} KB")
    return 0


if __name__ == "__main__":
    sys.exit(main())