#!/usr/bin/env python3
"""
Generate a professional PDF from a markdown file.

Requirements:
    pip install markdown weasyprint

Usage:
    python scripts/export-pdf.py <input.md> [output.pdf]

If output is not specified, uses the same name as input with .pdf extension.
"""

import re
import sys
from pathlib import Path

import markdown
from weasyprint import HTML

# --- CSS ---

CSS = """
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

@page {
    size: A4;
    margin: 25mm 20mm 25mm 20mm;

    @bottom-center {
        content: counter(page);
        font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
        font-size: 8pt;
        color: #718096;
    }
}

@page :first {
    @bottom-center { content: none; }
}

* { box-sizing: border-box; }

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    font-size: 10.5pt;
    line-height: 1.6;
    color: #1a202c;
    max-width: 100%;
}

h1 {
    font-size: 20pt;
    font-weight: 700;
    color: #1a365d;
    margin-top: 32px;
    margin-bottom: 12px;
    page-break-after: avoid;
}

h2 {
    font-size: 15pt;
    font-weight: 700;
    color: #1a365d;
    margin-top: 28px;
    margin-bottom: 10px;
    padding-bottom: 6px;
    border-bottom: 2px solid #e2e8f0;
    page-break-after: avoid;
}

h3 {
    font-size: 12pt;
    font-weight: 600;
    color: #2b6cb0;
    margin-top: 20px;
    margin-bottom: 8px;
    page-break-after: avoid;
}

h4 {
    font-size: 10.5pt;
    font-weight: 600;
    color: #2d3748;
    margin-top: 16px;
    margin-bottom: 6px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0 20px 0;
    font-size: 9pt;
    page-break-inside: auto;
}

thead { display: table-header-group; }
tr { page-break-inside: avoid; }

th {
    background-color: #2b6cb0;
    color: white;
    font-weight: 600;
    text-align: left;
    padding: 8px 10px;
    font-size: 8.5pt;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

td {
    padding: 7px 10px;
    border-bottom: 1px solid #e2e8f0;
    vertical-align: top;
}

tr:nth-child(even) td { background-color: #f7fafc; }

blockquote {
    border-left: 3px solid #2b6cb0;
    margin: 12px 0;
    padding: 8px 16px;
    background: #ebf8ff;
    color: #2a4365;
    font-size: 10pt;
    border-radius: 0 4px 4px 0;
}

code {
    background: #edf2f7;
    padding: 1px 4px;
    border-radius: 3px;
    font-size: 9pt;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

hr {
    border: none;
    border-top: 2px solid #e2e8f0;
    margin: 24px 0;
}

ul, ol { margin: 8px 0 12px 0; padding-left: 24px; }
li { margin-bottom: 4px; }
strong { font-weight: 600; color: #1a202c; }
a { color: #2b6cb0; text-decoration: none; }
p { margin: 8px 0; }

.section-break { page-break-before: always; }
.score-high { color: #276749; font-weight: 700; }
.score-medium { color: #d69e2e; font-weight: 700; }
.score-low { color: #c53030; font-weight: 700; }
"""


def postprocess_html(html: str) -> str:
    """Add CSS classes for scores and risk levels."""
    # Section breaks on h2 (except first)
    h2_count = 0

    def add_section_break(match: re.Match) -> str:
        nonlocal h2_count
        h2_count += 1
        if h2_count > 1:
            return f'<h2 class="section-break">{match.group(1)}</h2>'
        return match.group(0)

    html = re.sub(r"<h2>(.*?)</h2>", add_section_break, html)

    # Score coloring: 4/5, 5/5 green; 3/5 yellow; 1/5, 2/5 red
    html = re.sub(r"<td>([45])/5</td>", r'<td><span class="score-high">\1/5</span></td>', html)
    html = re.sub(r"<td>3/5</td>", '<td><span class="score-medium">3/5</span></td>', html)
    html = re.sub(r"<td>([12])/5</td>", r'<td><span class="score-low">\1/5</span></td>', html)

    return html


def main() -> None:
    if len(sys.argv) < 2:
        print("Usage: python export-pdf.py <input.md> [output.pdf]")
        sys.exit(1)

    input_path = Path(sys.argv[1])
    if not input_path.exists():
        print(f"Error: {input_path} not found")
        sys.exit(1)

    output_path = Path(sys.argv[2]) if len(sys.argv) > 2 else input_path.with_suffix(".pdf")

    md_text = input_path.read_text(encoding="utf-8")
    body_html = markdown.markdown(md_text, extensions=["tables", "smarty", "sane_lists"])
    body_html = postprocess_html(body_html)

    full_html = f"""<!DOCTYPE html>
<html lang="no">
<head>
    <meta charset="UTF-8">
    <style>{CSS}</style>
</head>
<body>
    {body_html}
</body>
</html>"""

    HTML(string=full_html).write_pdf(str(output_path))
    print(f"PDF generated: {output_path}")
    print(f"Size: {output_path.stat().st_size / 1024:.1f} KB")


if __name__ == "__main__":
    main()