#!/usr/bin/env python3
"""Render the frozen Markdown readers with exact TeX mathematics."""
from pathlib import Path
import argparse, hashlib, json, re, subprocess
ROOT=Path(__file__).resolve().parent.parent
parser=argparse.ArgumentParser()
parser.add_argument('kind',choices=['main','technical'])
args=parser.parse_args()
stem={'main':'490d_Chronological_Families_Explanation_C1431','technical':'490d_Technical_Companion_C1431'}[args.kind]
source=ROOT/'deliverables'/(stem+'.md')
out=ROOT/'deliverables'/(stem+'_Print.pdf')
work=ROOT/'prep'/'render';work.mkdir(exist_ok=True)
text=source.read_text()
title=text.splitlines()[0].removeprefix('# ')
text='\n'.join(text.splitlines()[1:]).lstrip()
text=re.sub(r'sandbox:/workspace/scratch/1b40da62dcbd/c1132_c1431/',str(ROOT)+'/',text)
if args.kind=='main':
    marker='![Six source routes'
    start=text.index(marker);stop=text.index('## Local changes become',start)
    text=text[:start]+r'\clearpage'+'\n\n'+text[start:stop]+r'\clearpage'+'\n\n'+text[stop:]
prepared=work/(args.kind+'_print.md');prepared.write_text(text)
header=work/'header.tex'
header.write_text(r'\let\oldtableofcontents\tableofcontents'+'\n'+r'\renewcommand{\tableofcontents}{\oldtableofcontents\clearpage}'+'\n'+r'\usepackage{etoolbox}'+'\n'+r'\AtBeginEnvironment{longtable}{\small}'+'\n'+r'\emergencystretch=3em'+'\n')
cmd=['pandoc',str(prepared),'-f','markdown+tex_math_single_backslash','--standalone','--pdf-engine=xelatex','--toc','--toc-depth=2','-V','mainfont=DejaVu Serif','-V','sansfont=DejaVu Sans','-V','mathfont=Latin Modern Math','-V','monofont=DejaVu Sans Mono','-V','fontsize=10pt','-V','geometry:margin=0.7in','-V','linestretch=1.08','-V','papersize=a4','-M','title='+title,'-M','date=September 28, 2026','--include-in-header='+str(header),'-o',str(out)]
result=subprocess.run(cmd,text=True,capture_output=True)
log=work/(args.kind+'_print_pandoc.log');log.write_text(result.stdout+result.stderr)
if result.returncode:raise SystemExit(result.returncode)
print(json.dumps({'source':str(source),'source_sha256':hashlib.sha256(source.read_bytes()).hexdigest(),'pdf':str(out),'pdf_sha256':hashlib.sha256(out.read_bytes()).hexdigest(),'bytes':out.stat().st_size,'log':str(log)}))