Environment Configuration

class Environment:
    def __init__(self, directory=None, url=None, **more_config):
        """
        Create a new asset environment.
        
        Parameters:
        - directory: Base directory for asset files (filesystem path)
        - url: Base URL for serving assets (web path)
        - **more_config: Additional configuration options:
          - debug: Debug mode setting (bool)
          - cache: Cache configuration (str/bool/Cache instance)  
          - auto_build: Automatically build bundles when accessed (bool)
          - load_path: Additional search paths (list)
          - url_mapping: URL path mappings (dict)
          - versions: Versioning strategy (str/Version instance)
          - manifest: Manifest configuration (str/Manifest instance)
          - updater: Update checking strategy (str/Updater instance)
        """

from webassets import Environment

# Basic environment
env = Environment('./static', '/static')

# Environment with configuration
env = Environment(
    directory='./assets',
    url='/assets',
    debug=False,
    cache=True,
    auto_build=True,
    versions='hash'
)

# Environment with advanced settings
env = Environment(
    './static',
    '/static',
    load_path=['./vendor', './themes'],
    url_mapping={'/images': './img'},
    cache='filesystem',
    manifest='json:manifest.json'
)

def register(self, name, *args, **kwargs):
    """
    Register a bundle with the environment.
    
    Parameters:
    - name: Bundle name for later reference
    - *args: Bundle arguments (files, nested bundles)
    - **kwargs: Bundle options (filters, output, etc.)
    
    Returns:
    The created Bundle instance
    """

def add(self, *bundles):
    """
    Add anonymous bundles to the environment.
    
    Parameters:
    - *bundles: Bundle instances to add
    """

def append_path(self, path, url=None):
    """
    Add a directory to the load path.
    
    Parameters:
    - path: Directory path to add
    - url: Optional URL mapping for the path
    """

# Register named bundles
js_bundle = env.register('js_all',
    'jquery.js',
    'app.js',
    filters='jsmin',
    output='gen/app.js'
)

css_bundle = env.register('css_all',
    'style.css',
    'layout.css', 
    filters='cssmin',
    output='gen/style.css'
)

# Add anonymous bundles
from webassets import Bundle
vendor_bundle = Bundle('vendor/lib.js', output='gen/vendor.js')
env.add(vendor_bundle)

# Add to load path
env.append_path('./vendor')
env.append_path('./themes', '/themes')

# Access registered bundles
js_urls = env['js_all'].urls()
css_urls = env['css_all'].urls()

class BundleRegistry:
    def register(self, name, *args, **kwargs):
        """Register a bundle with a name."""
    
    def add(self, *bundles):
        """Add anonymous bundles."""
    
    def __getitem__(self, name):
        """Get bundle by name."""
    
    def __contains__(self, name):
        """Check if bundle exists."""
    
    def __iter__(self):
        """Iterate over all bundles."""
    
    def __len__(self):
        """Get total number of registered bundles."""
    
    def __bool__(self):
        """Check if registry contains any bundles."""
    
    def decompose_bundle(self, name, bundle):
        """Decompose bundle with merge=False into individual file bundles."""
    
    def register_decomposed(self, name, bundle, abspath):
        """Register single decomposed bundle for specific file."""

class Resolver:
    def search_for_source(self, ctx, item):
        """
        Find source file in load paths.
        
        Parameters:
        - ctx: Search context
        - item: File or pattern to find
        
        Returns:
        Found file path or None
        """
    
    def resolve_source(self, ctx, item):
        """
        Resolve source to filesystem path.
        
        Parameters:
        - ctx: Resolution context
        - item: Source specification
        
        Returns:
        Absolute filesystem path
        """
    
    def resolve_source_to_url(self, ctx, filepath, item):
        """
        Resolve source to web URL.
        
        Parameters:
        - ctx: Resolution context
        - filepath: Source file path
        - item: Source item
        
        Returns:
        Web-accessible URL
        """
    
    def resolve_output_to_path(self, ctx, target, bundle):
        """
        Resolve output to filesystem path.
        
        Parameters:
        - ctx: Resolution context
        - target: Output target
        - bundle: Source bundle
        
        Returns:
        Output filesystem path
        """
    
    def resolve_output_to_url(self, ctx, target):
        """
        Resolve output to web URL.
        
        Parameters:
        - ctx: Resolution context
        - target: Output target
        
        Returns:
        Output web URL
        """
    
    def glob(self, basedir, expr):
        """
        Evaluate glob expression and return sorted absolute filenames.
        
        Parameters:
        - basedir: Base directory for glob evaluation
        - expr: Glob expression pattern
        
        Returns:
        Sorted list of absolute filenames matching pattern
        """
    
    def consider_single_directory(self, directory, item):
        """
        Search for item within specific directory, handling glob patterns.
        
        Parameters:
        - directory: Directory to search in
        - item: File or pattern to find
        
        Returns:
        File path or list of paths if glob pattern
        """
    
    def search_env_directory(self, ctx, item):
        """
        Search for source in environment's base directory.
        
        Parameters:
        - ctx: Resolution context
        - item: Source item to find
        
        Returns:
        Found file path or list of paths
        """
    
    def search_load_path(self, ctx, item):
        """
        Search for source files in configured load paths.
        
        Parameters:
        - ctx: Resolution context with load_path
        - item: Source item to find
        
        Returns:
        Found file path or None if not found
        """
    
    def search_for_source(self, ctx, item):
        """
        Perform comprehensive search for source item.
        
        Parameters:
        - ctx: Resolution context
        - item: Source item to find
        
        Returns:
        Found file path(s) or raises error if not found
        """
    
    def query_url_mapping(self, ctx, item):
        """
        Query URL mapping configuration for source item.
        
        Parameters:
        - ctx: Resolution context with url_mapping
        - item: Source item to look up
        
        Returns:
        Mapped URL or None if no mapping found
        """
    
    def query_url_mapping(self, ctx, filepath):
        """
        Find correct URL for filesystem path using URL mappings.
        
        Parameters:
        - ctx: Resolution context
        - filepath: Absolute filesystem path
        
        Returns:
        Web-accessible URL for the file
        """

class BundleRegistry:
    def __init__(self, env):
        """Initialize bundle registry for environment."""
    
    def __len__(self):
        """Return number of registered bundles."""
    
    def __bool__(self):
        """Return True if registry contains bundles."""
    
    def __getitem__(self, name):
        """Get bundle by name."""
    
    def __setitem__(self, name, bundle):
        """Register bundle with name."""
    
    def __delitem__(self, name):
        """Remove bundle from registry."""
    
    def __contains__(self, name):
        """Check if bundle name is registered."""
    
    def __iter__(self):
        """Iterate over bundle names."""
    
    def decompose_bundle(self, bundle):
        """
        Handle bundles with merge=False by decomposing into individual files.
        
        Parameters:
        - bundle: Bundle to decompose
        
        Returns:
        List of individual file bundles or original bundle
        """
    
    def register_decomposed(self, name, bundle):
        """
        Register bundle with decomposition handling.
        
        Parameters:
        - name: Bundle name
        - bundle: Bundle to register (may be decomposed)
        """

class ConfigStorage:
    def __init__(self, env):
        """Initialize configuration storage for environment."""
    
    def get(self, key, default=None):
        """Get configuration value with default."""
    
    def __getitem__(self, key):
        """Get configuration value."""
    
    def __setitem__(self, key, value):
        """Set configuration value."""
    
    def __delitem__(self, key):
        """Delete configuration value."""
    
    def __contains__(self, key):
        """Check if configuration key exists."""
    
    def update(self, d):
        """Update configuration with values from dictionary."""
    
    def setdefault(self, key, value):
        """Set configuration key to value if key doesn't exist."""

# Core properties
@property
def directory(self):
    """Asset base directory"""

@property  
def url(self):
    """Asset base URL"""

@property
def debug(self):
    """Debug mode setting"""

@property
def cache(self):
    """Caching configuration"""

@property
def auto_build(self):
    """Automatic building setting"""

@property
def load_path(self):
    """Additional search paths"""

@property
def url_mapping(self):
    """URL path mappings"""

@property
def resolver(self):
    """Path resolver instance"""

@property
def updater(self):
    """Update checker instance"""

@property
def versions(self):
    """Versioning configuration"""

@property
def manifest(self):
    """Manifest configuration"""

@property
def cache_file_mode(self):
    """File permissions for cached files (octal)"""

@property
def url_expire(self):
    """URL expiration setting for cache headers"""

@property
def config(self):
    """Configuration storage instance"""

@property
def cache_file_mode(self):
    """Cache file creation mode (octal)"""

def parse_debug_value(value):
    """
    Parse string value to debug option setting.
    
    Parameters:
    - value: String value to parse ('true', 'false', 'merge', etc.)
    
    Returns:
    Parsed debug setting (bool or string)
    """

# Parse debug values
debug_setting = parse_debug_value('merge')  # Returns 'merge'
debug_setting = parse_debug_value('true')   # Returns True
debug_setting = parse_debug_value('false')  # Returns False

# Development environment
dev_env = Environment(
    './src/assets',
    '/static',
    debug=True,
    auto_build=True,
    cache=False
)

# Production environment  
prod_env = Environment(
    './static',
    '/static',
    debug=False,
    cache='filesystem',
    versions='hash',
    manifest='json:manifest.json'
)

# Register same bundles in both
for env in [dev_env, prod_env]:
    env.register('js_app',
        'app.js',
        'utils.js',
        filters='jsmin' if not env.debug else None,
        output='gen/app.js'
    )

env = Environment('./static', '/static')

# Add multiple search paths
env.append_path('./vendor/css', '/vendor/css')
env.append_path('./themes', '/themes')
env.append_path('./node_modules', '/npm')

# URL mappings for different asset types
env.url_mapping = {
    '/images': './img',
    '/fonts': './fonts',
    '/icons': './icons'
}

def create_environment(mode='development'):
    config = {
        'directory': './static',
        'url': '/static',
        'debug': mode == 'development',
        'auto_build': mode == 'development',
        'cache': mode != 'development'
    }
    
    if mode == 'production':
        config.update({
            'versions': 'hash',
            'manifest': 'json:assets.json'
        })
    
    return Environment(**config)

# Create environment based on mode
env = create_environment('production')

# Flask integration example
def create_flask_assets(app):
    env = Environment(
        directory=app.static_folder,
        url=app.static_url_path,
        debug=app.debug,
        auto_build=app.debug
    )
    
    # Register common bundles
    env.register('js_vendor',
        'vendor/jquery.js',
        'vendor/bootstrap.js',
        filters='jsmin',
        output='gen/vendor.js'
    )
    
    return env