#!/usr/bin/env python3
"""Build HTML pages from Markdown sources."""

import re
from pathlib import Path
from markdown_it import MarkdownIt

ROOT = Path(__file__).parent
md = MarkdownIt("commonmark").enable("table")

CSS = """
    *, *::before, *::after { box-sizing: border-box; }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
      font-size: 16px;
      line-height: 1.7;
      color: #1a1a1a;
      background: #fff;
      margin: 0;
      padding: 0;
    }

    .container {
      max-width: 860px;
      margin: 0 auto;
      padding: 3rem 2rem 6rem;
    }

    h1 { font-size: 2.4rem; margin-bottom: 1.2rem; line-height: 1; }

    a.title-btn {
      display: inline-block;
      background: #6366f1;
      color: #fff;
      font-size: 2.4rem;
      font-weight: 700;
      padding: 0.2em 0.5em;
      border-radius: 8px;
      text-decoration: none;
      line-height: 1.2;
      transition: background 0.15s;
    }
    a.title-btn:hover { background: #4f46e5; text-decoration: none; }

    h2 { font-size: 1.4rem; margin-top: 3rem; border-bottom: 1px solid #e0e0e0; padding-bottom: 0.3rem; }
    h3 { font-size: 1.1rem; margin-top: 2rem; }

    a { color: #0066cc; text-decoration: none; }
    a:hover { text-decoration: underline; }

    blockquote {
      margin: 1.5rem 0;
      padding: 0.8rem 1.2rem;
      border-left: 4px solid #0066cc;
      background: #f4f8ff;
      color: #333;
    }
    blockquote p { margin: 0; }

    blockquote.example {
      border-left: 4px solid #6366f1;
      background: #f8f8fb;
      padding: 0.8rem 1.2rem 0.2rem;
    }
    blockquote.example .example-label {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      color: #6366f1;
      margin-bottom: 0.5rem;
    }

    blockquote.schema {
      border-left: 4px solid #6366f1;
      background: #f8f8fb;
      padding: 0.5rem 1.2rem;
      margin-bottom: 0;
      border-bottom: none;
      border-radius: 6px 6px 0 0;
    }
    blockquote.schema p { margin: 0; font-size: 0.85rem; font-weight: 600; color: #6366f1; }
    blockquote.schema + table {
      border: 1px solid #c7c7f0;
      border-top: none;
      border-radius: 0 0 6px 6px;
      overflow: hidden;
      margin-top: 0;
    }
    blockquote.schema + table th {
      background: #ebebfa;
      border-color: #c7c7f0;
    }
    blockquote.schema + table td {
      border-color: #c7c7f0;
    }

    code {
      font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
      font-size: 0.88em;
      background: #f3f3f3;
      padding: 0.15em 0.4em;
      border-radius: 3px;
    }

    pre {
      background: #f6f6f7;
      color: #1a1a1a;
      border: 1px solid #e4e4e7;
      padding: 1.2rem 1.4rem;
      border-radius: 6px;
      overflow-x: auto;
      line-height: 1.5;
    }
    pre code {
      background: none;
      padding: 0;
      font-size: 0.85em;
      color: inherit;
    }

    table {
      border-collapse: collapse;
      width: 100%;
      margin: 1.2rem 0;
      font-size: 0.93em;
      display: block;
      overflow-x: auto;
    }
    th {
      background: #f0f0f0;
      text-align: left;
      padding: 0.5rem 0.8rem;
      border: 1px solid #d0d0d0;
    }
    td {
      padding: 0.45rem 0.8rem;
      border: 1px solid #d0d0d0;
    }
    tr:nth-child(even) td { background: #fafafa; }

    hr {
      border: none;
      border-top: 1px solid #e8e8e8;
      margin: 2.5rem 0;
    }

    ul, ol { padding-left: 1.5rem; }
    li { margin: 0.3rem 0; }

    p { margin: 0.8rem 0; }

    em { color: #444; }

    .badge {
      display: inline-block;
      background: #e4e4e7;
      color: #3f3f46;
      font-size: 0.78em;
      font-weight: 700;
      padding: 0.1em 0.45em;
      border-radius: 5px;
      vertical-align: baseline;
      letter-spacing: 0.01em;
    }

    .site-header {
      background: #fff;
      border-bottom: 1px solid #e4e4e7;
      position: sticky;
      top: 0;
      z-index: 100;
    }
    .site-header-inner {
      max-width: 860px;
      margin: 0 auto;
      padding: 0.6rem 2rem;
      display: flex;
      align-items: center;
      gap: 1.5rem;
    }
    .site-header a.header-btn {
      display: inline-block;
      background: #6366f1;
      color: #fff;
      font-size: 0.9rem;
      font-weight: 700;
      padding: 0.3em 0.75em;
      border-radius: 6px;
      text-decoration: none;
      transition: background 0.15s;
      white-space: nowrap;
    }
    .site-header a.header-btn:hover { background: #4f46e5; text-decoration: none; }
    .site-header .header-tagline {
      color: #71717a;
      font-size: 0.85rem;
      flex: 1;
    }
    .site-header nav { display: flex; gap: 1.2rem; }
    .site-header nav a {
      color: #3f3f46;
      font-size: 0.85rem;
      font-weight: 500;
      text-decoration: none;
    }
    .site-header nav a:hover { color: #6366f1; text-decoration: none; }

    @media (max-width: 600px) {
      .site-header-inner { padding: 0.6rem 1rem; gap: 0.8rem; }
      .site-header .header-tagline { display: none; }
      .site-header nav { gap: 0.8rem; }
    }
"""

HEADER = """
  <header class="site-header">
    <div class="site-header-inner">
      <a class="header-btn" href="/">ifc-commit</a>
      <span class="header-tagline">Git-native workflows for IFC</span>
      <nav>
        <a href="/research">Research</a>
        <a href="/app">Demo</a>
        <a href="https://gitaec.org/rvba/ifc-commit" target="_blank">Source ↗</a>
      </nav>
    </div>
  </header>
"""


def process(body: str, title_link: str | None = None, title_text: str = "ifc-commit") -> str:
    """Apply post-processing transformations to rendered HTML body."""

    # Style blockquotes that open with <strong>Example</strong>
    body = re.sub(
        r'<blockquote>\s*<p><strong>Example</strong>',
        '<blockquote class="example"><p><span class="example-label">Example</span>',
        body,
    )

    # Style blockquotes that open with <strong>Schema</strong>
    body = re.sub(
        r'<blockquote>\s*<p><strong>Schema</strong>',
        '<blockquote class="schema"><p>Schema',
        body,
    )

    # Protect headings from badge replacement
    body = re.sub(
        r'(<h[1-6][^>]*>)(.*?)(</h[1-6]>)',
        lambda m: m.group(1) + m.group(2).replace('ifc-commit', '\x00') + m.group(3),
        body, flags=re.DOTALL,
    )
    # Badge-wrap plain-text occurrences of "ifc-commit"
    body = re.sub(r'(?<![=/"\w])ifc-commit(?![\w])', '<span class="badge">ifc-commit</span>', body)
    # Restore headings
    body = body.replace('\x00', 'ifc-commit')

    # Turn the h1 into a title-button link
    if title_link:
        body = body.replace(
            f'<h1>{title_text}</h1>',
            f'<h1><a class="title-btn" href="{title_link}">{title_text}</a></h1>',
            1,
        )

    return body


def build(source: Path, output: Path, title: str, title_link: str | None = None, title_text: str = "ifc-commit"):
    body = md.render(source.read_text())
    body = process(body, title_link=title_link, title_text=title_text)

    html = f"""<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>{title}</title>
  <style>{CSS}</style>
</head>
<body>
  {HEADER}
  <div class="container">
    {body}
  </div>
</body>
</html>
"""
    output.write_text(html)
    print(f"Written: {output}")


build(
    source=ROOT / "README.md",
    output=ROOT / "index.html",
    title="ifc-commit — Version your BIM",
    title_link="/",
)

build(
    source=ROOT / "docs" / "research.md",
    output=ROOT / "research.html",
    title="ifc-commit — Research Notes",
    title_link="/research",
    title_text="Research Notes",
)