package org.daisy.pipeline.css;
   
   import java.io.IOException;
   import java.util.Collection;
   import java.util.Collections;
   
   import javax.xml.transform.Source;
   import javax.xml.transform.URIResolver;
   
  import org.daisy.pipeline.css.Medium;
  import org.daisy.pipeline.css.sass.impl.SassAnalyzer;
  import org.daisy.pipeline.datatypes.DatatypeRegistry;
  import org.daisy.pipeline.datatypes.DatatypeService;
  
  /**
   * Analyzes a style sheet and extracts information about global variables.
   */
  public class CssAnalyzer {
  
  	private final org.daisy.pipeline.css.sass.impl.SassAnalyzer analyzer;
  
  	public CssAnalyzer(Medium medium, URIResolver uriResolver, DatatypeRegistry datatypes) {
  	    this(Collections.singleton(medium), uriResolver, datatypes);
  	}
  
  	public CssAnalyzer(Collection<Medium> media, URIResolver uriResolver, DatatypeRegistry datatypes) {
  		analyzer = new SassAnalyzer(media, uriResolver, datatypes);
  	}
  
  	/**
  	 * Get the variables declared within the given style sheets and source document.
  	 *
  	 * @param userAndUserAgentStylesheets {@code Source} objects must have absolute hierarchical URI as
  	 *                                    system ID
  	 * @param sourceDocument {@code Source} object must have absolute hierarchical URI as system ID,
  	 *                       or object may be {@code null}.
  	 */
  	public Result analyze(Iterable<Source> userAndUserAgentStylesheets, Source sourceDocument) throws IOException {
  		return new Result(analyzer.getVariableDeclarations(userAndUserAgentStylesheets, sourceDocument));
  	}
  
  	public interface SassVariable {
  		public String getName();
  		public String getNiceName();
  		public String getDescription();
  		public String getValue();
  		public boolean isDefault();
  		public DatatypeService getType();
  	}
  
  	public static class Result {
  
  		private final Collection<SassVariable> variables;
  
  		private Result(Collection<? extends SassVariable> variables) {
  			this.variables = Collections.unmodifiableCollection(variables);
  		}
  
  		public Collection<SassVariable> getVariables() {
  			return variables;
  		}
  	}
  }