#!/usr/bin/env python3
"""
Build script for kashilo.com
Minifies JS and CSS files into dist/ directory.

Usage: python3 build.py
Requirements: pip3 install rjsmin rcssmin
"""

import os
import shutil
import sys

try:
    import rjsmin
    import rcssmin
except ImportError:
    print("Missing dependencies. Install with:")
    print("  pip3 install rjsmin rcssmin")
    sys.exit(1)

SRC_DIR = os.path.dirname(os.path.abspath(__file__))
DIST_DIR = os.path.join(SRC_DIR, 'dist')

EXCLUDE_DIRS = {'.git', 'dist', 'node_modules', 'docs', 'tests', '.vscode', '.idea', '__pycache__'}
EXCLUDE_FILES = {'AGENTS.md', 'deploy.sh', 'build.py', 'README.md', '.gitignore'}

def should_exclude(path):
    parts = os.path.relpath(path, SRC_DIR).split(os.sep)
    return any(p in EXCLUDE_DIRS for p in parts) or os.path.basename(path) in EXCLUDE_FILES

def build():
    if os.path.exists(DIST_DIR):
        shutil.rmtree(DIST_DIR)

    js_saved = 0
    css_saved = 0
    files_copied = 0

    for root, dirs, files in os.walk(SRC_DIR):
        dirs[:] = [d for d in dirs if d not in EXCLUDE_DIRS]

        for filename in files:
            src_path = os.path.join(root, filename)
            if should_exclude(src_path):
                continue

            rel_path = os.path.relpath(src_path, SRC_DIR)
            dest_path = os.path.join(DIST_DIR, rel_path)
            os.makedirs(os.path.dirname(dest_path), exist_ok=True)

            if filename.endswith('.js') and not filename.endswith('.min.js'):
                with open(src_path, 'r', encoding='utf-8') as f:
                    original = f.read()
                minified = rjsmin.jsmin(original)
                with open(dest_path, 'w', encoding='utf-8') as f:
                    f.write(minified)
                saved = len(original.encode('utf-8')) - len(minified.encode('utf-8'))
                js_saved += saved
                files_copied += 1

            elif filename.endswith('.css') and not filename.endswith('.min.css'):
                with open(src_path, 'r', encoding='utf-8') as f:
                    original = f.read()
                minified = rcssmin.cssmin(original)
                with open(dest_path, 'w', encoding='utf-8') as f:
                    f.write(minified)
                saved = len(original.encode('utf-8')) - len(minified.encode('utf-8'))
                css_saved += saved
                files_copied += 1

            else:
                shutil.copy2(src_path, dest_path)
                files_copied += 1

    print(f"Build complete: {files_copied} files -> dist/")
    print(f"  JS savings:  {js_saved / 1024:.1f} KiB")
    print(f"  CSS savings: {css_saved / 1024:.1f} KiB")
    print(f"  Total saved: {(js_saved + css_saved) / 1024:.1f} KiB")

if __name__ == '__main__':
    build()