package de.tum.in.i22.uc.cm.datatypes.basic;

import java.util.Collections;
import java.util.Map;
import java.util.Objects;
import java.util.UUID;

import de.tum.in.i22.uc.cm.datatypes.interfaces.IScope;
import de.tum.in.i22.uc.cm.pip.interfaces.EScopeType;

/**
 * @author lovat
 *
 */
public class ScopeBasic implements IScope {
	// Define a class of scopes.
	// This is used as a simple filter to rule out certain scopes when searching
	// for a specific one


	private final String _id;
	private final String _humanReadableName;
	private final Map<String, Object> _attributes;
	private final EScopeType _scopeType;


	public ScopeBasic() {
		this("<empty scope>", EScopeType.UNKNOWN, Collections.<String, Object> emptyMap());
	}

	public ScopeBasic(String humanReadableName, EScopeType st, Map<String, Object> attributes) {
		_id = UUID.randomUUID().toString();
		_humanReadableName = humanReadableName;
		_attributes = attributes;
		_scopeType=st;
	}


	/**
	 * Two scopes are the same if they have the same type and the same list of attributes.
	 * the field _id is unique for each scope so it cannot match. _humanreadableName is
	 * also just for debugging purposes so it is not considered in the comparison.
	 *
	 * Note that o may contain additional attributes.
	 * The correct interpretation of this equality function is more that of a refinement relations.
	 *
	 *  This also implies that it is not reflexive.
	 *
	 *  a.equals(b) is not necessarily the same as b.equals(a)
	 *
	 *  a.equals(b) is true if every attribute in a is also in b, i.e. if b refines a.
	 *
	 *
	 * @param o the scope to compare to
	 * @return true if they are the same. false otherwise.
	 */
	@Override
	public boolean equals(Object obj) {
		if (obj instanceof  ScopeBasic) {
			ScopeBasic o = (ScopeBasic) obj;
			return Objects.equals(_scopeType, o._scopeType)
					&& Objects.equals(_attributes, o._attributes);
		}
		return false;  
	}

	@Override
	public int hashCode() {
		return Objects.hash(_scopeType, _attributes);
	}



	@Override
	public String toString() {
		return "[("+_id + ") "
				+ _humanReadableName +
//				", _attributes=" + _attributes
//				+ ", _scopeType=" + _scopeType +
				"]";
	}


	/**
	 * @return the _humanReadableName
	 */
	public String getHumanReadableName() {
		return _humanReadableName;
	}

	@Override
	public String getId() {
		return _id;
	}
	
	@Override
	public EScopeType getScopeType() {
		return _scopeType;
	}

}