using System;
using System.Collections.Generic;

namespace AspClassic.Parser;

/// <summary>
/// A parse tree for a compound assignment statement.
/// </summary>
public sealed class CompoundAssignmentStatement : Statement
{
	private readonly Expression _TargetExpression;

	private readonly OperatorType _CompoundOperator;

	private readonly Location _OperatorLocation;

	private readonly Expression _SourceExpression;

	/// <summary>
	/// The target of the assignment.
	/// </summary>
	public Expression TargetExpression => _TargetExpression;

	/// <summary>
	/// The compound operator.
	/// </summary>
	public OperatorType CompoundOperator => _CompoundOperator;

	/// <summary>
	/// The location of the operator.
	/// </summary>
	public Location OperatorLocation => _OperatorLocation;

	/// <summary>
	/// The source of the assignment.
	/// </summary>
	public Expression SourceExpression => _SourceExpression;

	/// <summary>
	/// Constructs a new parse tree for a compound assignment statement.
	/// </summary>
	/// <param name="compoundOperator">The compound operator.</param>
	/// <param name="targetExpression">The target of the assignment.</param>
	/// <param name="operatorLocation">The location of the operator.</param>
	/// <param name="sourceExpression">The source of the assignment.</param>
	/// <param name="span">The location of the parse tree.</param>
	/// <param name="comments">The comments for the parse tree.</param>
	public CompoundAssignmentStatement(OperatorType compoundOperator, Expression targetExpression, Location operatorLocation, Expression sourceExpression, Span span, IList<Comment> comments)
		: base(TreeType.CompoundAssignmentStatement, span, comments)
	{
		if (compoundOperator < OperatorType.Plus || compoundOperator > OperatorType.Power)
		{
			throw new ArgumentOutOfRangeException("compoundOperator");
		}
		if (targetExpression == null)
		{
			throw new ArgumentNullException("targetExpression");
		}
		if (sourceExpression == null)
		{
			throw new ArgumentNullException("sourceExpression");
		}
		SetParent(targetExpression);
		SetParent(sourceExpression);
		_CompoundOperator = compoundOperator;
		_TargetExpression = targetExpression;
		_OperatorLocation = operatorLocation;
		_SourceExpression = sourceExpression;
	}

	protected override void GetChildTrees(IList<Tree> childList)
	{
		Tree.AddChild(childList, TargetExpression);
		Tree.AddChild(childList, SourceExpression);
	}
}