"""Build the guide's own printable sheet offline; not a browser print test."""
from pathlib import Path
from datetime import datetime, timezone
import hashlib, json, platform, subprocess
import pymupdf

HERE = Path(__file__).resolve().parent
CSS = """body {font-family: sans-serif; font-size: 10pt; line-height: 1.2; color: #17252f;}
h1 {font-size: 24pt; color: #164c63; margin-bottom: 5pt;}
h2 {font-size: 13pt; color: #164c63; margin-top: 14pt; margin-bottom: 5pt;}
p {margin-top: 6pt; margin-bottom: 7pt;}
table {border-collapse: collapse; width: 100%; font-size: 8.4pt;}
th {background-color: #e7f0f3; text-align: left;}
th, td {border: 0.5pt solid #b8cbd2; padding: 5pt; vertical-align: top;}
pre {background-color: #f0f4f5; padding: 9pt; font-size: 9pt; white-space: pre-wrap;}
code {font-family: monospace; font-size: 8.3pt;}
"""

def build():
    source = (HERE / 'cheat-sheet.md').read_text()
    # This explicit build-only separator is not a Markdown syntax claim.
    parts = source.split('<!-- sheet-page -->')
    merged = pymupdf.open()
    html_parts = []
    sheets = []
    for index, part in enumerate(parts, 1):
        html = subprocess.run(['pandoc', '--from=gfm', '--to=html5', '--wrap=none', '--no-highlight'], input=part, text=True, capture_output=True, check=True).stdout
        html_parts.append(html)
        story = pymupdf.Story(html=html, user_css=CSS)
        paper = pymupdf.paper_rect('a4')
        content = paper + (36, 32, -36, -38)
        document = story.write_with_links(lambda rect_num, filled: (paper, content, None))
        if len(document) != 1:
            raise RuntimeError(f'Sheet {index} overflows: {len(document)} pages')
        merged.insert_pdf(document)
        sheets.append({'sheet': index, 'pages': len(document)})
        document.close()
    for i, page in enumerate(merged):
        page.insert_text((36, page.rect.height-22), f'Markdown reference | Core and extensions kept separate | {i+1}', fontsize=8, color=(0.18,0.3,0.35))
    destination = HERE / 'markdown-cheat-sheet.pdf'
    merged.set_metadata({'title': 'Markdown cheat sheet: core syntax and extensions', 'author': 'Markovo editorial', 'subject': 'Locally rendered printable reference; editable source supplied separately'})
    merged.save(destination, garbage=4, deflate=True)
    merged.close()
    (HERE/'cheat-sheet-html.txt').write_text('\n<!-- next sheet -->\n'.join(html_parts))
    document = pymupdf.open(destination)
    text = '\n'.join(page.get_text() for page in document)
    (HERE/'cheat-sheet-extracted.txt').write_text(text)
    assets = HERE.parents[1] / 'review-assets'
    assets.mkdir(exist_ok=True)
    for i, page in enumerate(document):
        page.get_pixmap(matrix=pymupdf.Matrix(1.4,1.4)).save(assets/f'cheat-sheet-page-{i+1}.png')
    report = {
        'date': datetime.now(timezone.utc).isoformat(), 'python': platform.python_version(),
        'pymupdf': pymupdf.__version__, 'pandoc': subprocess.check_output(['pandoc','--version'],text=True).splitlines()[0],
        'command': 'tools/lab-venv/bin/python runs/2026-11-02-markovo-markdown-cheat-sheet-pdf/lab/renderers/build_pdf.py',
        'markdown_command': 'pandoc --from=gfm --to=html5 --wrap=none --no-highlight (each source half through stdin)',
        'layout': {'paper':'A4', 'margin_points':[36,32,36,38], 'font':'built-in sans-serif and monospace', 'build_only_separator':'<!-- sheet-page -->'},
        'pages': len(document), 'sheets': sheets,
        'checks': {key: key in text for key in ['# Heading','**bold**','~~removed~~','| Name | State |','| --- | --- |','print("hello")','Find the failed stage','Keep both copies']},
        'pdf': 'lab/renderers/markdown-cheat-sheet.pdf', 'sha256': hashlib.sha256(destination.read_bytes()).hexdigest(),
        'scope': 'Own PDF built with Pandoc HTML and PyMuPDF Story. Page images require separate visual inspection. Not browser printing or a PDF extraction benchmark.'
    }
    (HERE/'pdf-build.json').write_text(json.dumps(report,indent=2)+'\n')
    print(json.dumps(report,indent=2))

if __name__ == '__main__': build()