using ReactiveUI;
using System;

namespace AuroraDesk.Core.Entities;

/// <summary>
/// 连接实体 - 表示两个连接点之间的连线
/// </summary>
public class Connection : ReactiveObject
{
    private ConnectionPoint? _sourcePoint;
    private ConnectionPoint? _targetPoint;

    /// <summary>
    /// 连接唯一标识符
    /// </summary>
    public string Id { get; set; } = Guid.NewGuid().ToString();

    /// <summary>
    /// 源连接点（输出点）
    /// </summary>
    public ConnectionPoint? SourcePoint
    {
        get => _sourcePoint;
        set => this.RaiseAndSetIfChanged(ref _sourcePoint, value);
    }

    /// <summary>
    /// 目标连接点（输入点）
    /// </summary>
    public ConnectionPoint? TargetPoint
    {
        get => _targetPoint;
        set => this.RaiseAndSetIfChanged(ref _targetPoint, value);
    }

    /// <summary>
    /// 验证连接是否有效（输出点必须连接到输入点）
    /// </summary>
    public bool IsValid()
    {
        if (SourcePoint == null || TargetPoint == null)
            return false;

        return SourcePoint.Type == ConnectionPointType.Output &&
               TargetPoint.Type == ConnectionPointType.Input &&
               SourcePoint.Node != TargetPoint.Node; // 不能连接到同一个节点
    }
}