/* valaenum.vala
 *
 * Copyright (C) 2006-2010  Jürg Billeter
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.

 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 *
 * Author:
 * 	Jürg Billeter <j@bitron.ch>
 */

using GLib;

/**
 * Represents an enum declaration in the source code.
 */
public class Vala.Enum : TypeSymbol {
	/**
	 * Specifies whether this is a flags enum.
	 */
	public bool is_flags {
		get {
			if (_is_flags == null) {
				_is_flags = get_attribute ("Flags") != null;
			}
			return _is_flags;
		}
	}

	private List<EnumValue> values = new ArrayList<EnumValue> ();
	private List<Method> methods = new ArrayList<Method> ();
	private List<Constant> constants = new ArrayList<Constant> ();

	private bool? _is_flags;

	/**
	 * Creates a new enum.
	 *
	 * @param name             type name
	 * @param source_reference reference to source code
	 * @return                 newly created enum
	 */
	public Enum (string name, SourceReference? source_reference = null, Comment? comment = null) {
		base (name, source_reference, comment);
	}

	/**
	 * Appends the specified enum value to the list of values.
	 *
	 * @param value an enum value
	 */
	public void add_value (EnumValue value) {
		value.access = SymbolAccessibility.PUBLIC;

		values.add (value);
		scope.add (value.name, value);
	}

	/**
	 * Adds the specified method as a member to this enum.
	 *
	 * @param m a method
	 */
	public override void add_method (Method m) {
		if (m is CreationMethod) {
			Report.error (m.source_reference, "construction methods may only be declared within classes and structs");

			m.error = true;
			return;
		}
		if (m.binding == MemberBinding.INSTANCE) {
			m.this_parameter = new Parameter ("this", new EnumValueType (this), m.source_reference);
			m.scope.add (m.this_parameter.name, m.this_parameter);
		}
		if (!(m.return_type is VoidType) && m.get_postconditions ().size > 0) {
			m.result_var = new LocalVariable (m.return_type.copy (), "result", null, m.source_reference);
			m.result_var.is_result = true;
		}

		methods.add (m);
		scope.add (m.name, m);
	}

	/**
	 * Adds the specified constant as a member to this enum.
	 *
	 * @param c a constant
	 */
	public override void add_constant (Constant c) {
		constants.add (c);
		scope.add (c.name, c);
	}

	/**
	 * Returns the list of enum values.
	 *
	 * @return list of enum values
	 */
	public unowned List<EnumValue> get_values () {
		return values;
	}

	/**
	 * Returns the list of methods.
	 *
	 * @return list of methods
	 */
	public unowned List<Method> get_methods () {
		return methods;
	}

	/**
	 * Returns the list of constants.
	 *
	 * @return list of constants
	 */
	public unowned List<Constant> get_constants () {
		return constants;
	}

	public override void accept (CodeVisitor visitor) {
		visitor.visit_enum (this);
	}

	public override void accept_children (CodeVisitor visitor) {
		foreach (EnumValue value in values) {
			value.accept (visitor);
		}

		foreach (Method m in methods) {
			m.accept (visitor);
		}

		foreach (Constant c in constants) {
			c.accept (visitor);
		}
	}

	public override bool is_reference_type () {
		return false;
	}

	public override bool check (CodeContext context) {
		if (checked) {
			return !error;
		}

		checked = true;

		var old_source_file = context.analyzer.current_source_file;
		var old_symbol = context.analyzer.current_symbol;

		if (source_reference != null) {
			context.analyzer.current_source_file = source_reference.file;
		}
		context.analyzer.current_symbol = this;

		if (values.size <= 0) {
			Report.error (source_reference, "Enum `%s' requires at least one value", get_full_name ());
			error = true;
			return false;
		}

		foreach (EnumValue value in values) {
			value.check (context);
		}

		foreach (Method m in methods) {
			m.check (context);
		}

		foreach (Constant c in constants) {
			c.check (context);
		}

		context.analyzer.current_source_file = old_source_file;
		context.analyzer.current_symbol = old_symbol;

		return !error;
	}
}