using SQLite;


namespace Backend.Model;

public abstract class TreeNode
{
    [PrimaryKey, AutoIncrement]
    public Int64  Id          { get; set; }
    public String Name        { get; set; } = "";
    public String Information { get; set; } = "";  // unstructured random info

    protected Boolean Equals(TreeNode other)
    {
        return Id == other.Id && ParentId == other.ParentId;
    }

    public override Boolean Equals(Object? obj)
    {
        if (ReferenceEquals(null, obj)) return false;
        if (ReferenceEquals(this, obj)) return true;
        return obj.GetType() == this.GetType() && Equals((TreeNode)obj);
    }

    public override Int32 GetHashCode()
    {
        return HashCode.Combine(Id, ParentId);
    }

    [Indexed] // parent/child relation
    public Int64  ParentId { get; set; }    

    [Ignore]  // not in DB, can be used in typescript as type discriminator
    public String Type => GetType().Name;     
}