namespace EC.Helper.RabbitFunc.Compiler;

[Serializable]
public readonly struct SourceLocation : IEquatable<SourceLocation>
{
    public static readonly SourceLocation None = new SourceLocation(0, 16707566, 0, true);
    public static readonly SourceLocation Invalid = new SourceLocation(0, 0, 0, true);
    public static readonly SourceLocation MinValue = new SourceLocation(0, 1, 1);

    private readonly int index;
    private readonly int line;
    private readonly int column;

    public SourceLocation(int index, int line, int column)
    {
        if (index < 0)
            throw new ArgumentOutOfRangeException(nameof(index));
        if (line < 1)
            throw new ArgumentOutOfRangeException(nameof(line));
        if (column < 1)
            throw new ArgumentOutOfRangeException(nameof(column));

        this.index = index;
        this.line = line;
        this.column = column;
    }

    private SourceLocation(int index, int line, int column, bool _)
    {
        this.index = index;
        this.line = line;
        this.column = column;
    }

    public int Index => index;

    public int Line => line;

    public int Column => column;

    public bool IsValid => line != 0 && column != 0;

    public static bool operator ==(SourceLocation left, SourceLocation right)
    {
        return left.index == right.index && left.line == right.line && left.column == right.column;
    }

    public static bool operator !=(SourceLocation left, SourceLocation right)
    {
        return left.index != right.index || left.line != right.line || left.column != right.column;
    }

    public static bool operator <(SourceLocation left, SourceLocation right)
    {
        return left.index < right.index;
    }

    public static bool operator >(SourceLocation left, SourceLocation right)
    {
        return left.index > right.index;
    }

    public static bool operator <=(SourceLocation left, SourceLocation right)
    {
        return left.index <= right.index;
    }

    public static bool operator >=(SourceLocation left, SourceLocation right)
    {
        return left.index >= right.index;
    }

    public static int Compare(SourceLocation left, SourceLocation right)
    {
        return left > right ? 1 : left < right ? -1 : 0;
    }

    public bool Equals(SourceLocation other)
    {
        return other.index == index && other.line == line && other.column == column;
    }

    public override bool Equals(object obj)
    {
        return obj is SourceLocation other && Equals(other);
    }

    public override int GetHashCode()
    {
        return (line << 16) ^ column;
    }

    public override string ToString()
    {
        return string.Format("{{index:{0} line:{1} column:{2}}}", index, line, column);
    }
}