#!/usr/bin/env python3
"""
build.py — CSS-Framework Minifier
Erzeugt dist/main.min.css, dist/framework.min.js und dist/index.html

Verwendung: python3 build.py
"""

import re
import pathlib

DIST = pathlib.Path("dist")

CSS_ORDER = ["tokens.css", "base.css", "components.css", "utilities.css"]
JS_SOURCE = pathlib.Path("framework.js")
HTML_SOURCE = pathlib.Path("index.html")

CSS_LINKS = "\n".join(
    f'  <link rel="stylesheet" href="{f}">' for f in CSS_ORDER
)


def minify_css(src: str) -> str:
    src = re.sub(r"/\*.*?\*/", "", src, flags=re.DOTALL)  # Kommentare entfernen
    src = re.sub(r"\s+", " ", src)                         # Whitespace normalisieren
    src = re.sub(r"\s*([{};:,>~])\s*", r"\1", src)         # Leerzeichen um Sonderzeichen (+/- bleiben wegen calc())
    src = re.sub(r";\}", "}", src)                          # Letztes Semikolon in Block
    return src.strip()


def minify_js(src: str) -> str:
    src = re.sub(r"//.*?$", "", src, flags=re.MULTILINE)   # Zeilenkommentare
    src = re.sub(r"/\*.*?\*/", "", src, flags=re.DOTALL)   # Blockkommentare
    src = re.sub(r"\n\s*\n", "\n", src)                    # Leerzeilen
    src = re.sub(r"[ \t]+", " ", src)                      # Horizontalen Whitespace
    src = re.sub(r" ?([\[\]{}();,=+\-*/<>!&|?:]) ?", r"\1", src)  # um Operatoren
    return src.strip()


def build():
    DIST.mkdir(exist_ok=True)

    # CSS: alle vier Layer bündeln und minifizieren → main.min.css
    css_total = 0
    combined = []
    for filename in CSS_ORDER:
        src = pathlib.Path(filename).read_text(encoding="utf-8")
        css_total += len(src.encode())
        combined.append(src)
    main_min = minify_css("\n".join(combined))
    (DIST / "main.min.css").write_text(main_min, encoding="utf-8")
    print(f"  main.min.css: {css_total / 1024:.1f} KB → {len(main_min.encode()) / 1024:.1f} KB")

    # JS: minifizieren → framework.min.js
    js_src = JS_SOURCE.read_text(encoding="utf-8")
    js_min = minify_js(js_src)
    (DIST / "framework.min.js").write_text(js_min, encoding="utf-8")
    print(f"  framework.min.js: {len(js_src.encode()) / 1024:.1f} KB → {len(js_min.encode()) / 1024:.1f} KB")

    # theme.js minifizieren, Demo-Dateien unverändert kopieren
    (DIST / "theme.min.js").write_text(minify_js(pathlib.Path("theme.js").read_text(encoding="utf-8")), encoding="utf-8")
    for name in ("demo.css", "demo.js"):
        (DIST / name).write_text(pathlib.Path(name).read_text(encoding="utf-8"), encoding="utf-8")
    print("  theme.min.js, demo.css, demo.js")

    # HTML: vier CSS-Links → main.min.css, framework.js → framework.min.js
    html = HTML_SOURCE.read_text(encoding="utf-8")
    html = html.replace(CSS_LINKS, '  <link rel="stylesheet" href="main.min.css">')
    html = html.replace('src="framework.js"', 'src="framework.min.js"')
    html = html.replace('src="theme.js"', 'src="theme.min.js"')
    (DIST / "index.html").write_text(html, encoding="utf-8")
    print(f"  index.html → dist/index.html (minifizierte Pfade)")

    print(f"\nFertig — Ausgabe in {DIST}/")


if __name__ == "__main__":
    print("CSS-Framework Build\n")
    build()