using System.Linq;
using Texty.Scripts.Game;

namespace Texty.Scripts.Commands;

public enum LookModifier
{
    At,
    Around
}

public partial class LookCommand : Command
{
    public LookCommand()
    {
    }

    public LookCommand(string[] arguments) : base(CommandType.Look, arguments)
    {
        (Modifier, arguments) = TryParseModifier(arguments);
        Target = string.Join(" ", arguments);
    }

    public string Target { get; }
    public LookModifier? Modifier { get; }

    /// <summary>
    ///     Access this <c>LookCommand</c>'s modifier as a string.
    /// </summary>
    /// <remarks>
    ///     This function is provided as a means for testing the modifier parsing from GDScript.
    /// </remarks>
    private string ModifierAsString => Modifier?.ToString();

    public override string ToString()
    {
        return $"look {ModifierAsString?.ToLower()} {string.Join(" ", Target)}";
    }

    /// <summary>
    ///     Try to parse this <c>LookCommand</c>'s modifier from the given arguments.
    /// </summary>
    /// <param name="arguments">The arguments given to this look commands</param>
    /// <returns>A pair consisting of the parse modifier and the remaining arguments</returns>
    private static (LookModifier?, string[]) TryParseModifier(string[] arguments)
    {
        if (arguments.Length == 0)
            return (null, arguments);

        return arguments[0].ToLower() switch
        {
            "at" => (LookModifier.At, arguments.Skip(1).ToArray()),
            "around" => (LookModifier.Around, new string[] { }),
            _ => (null, arguments)
        };
    }
}