using System.Text.RegularExpressions;

using MultiversalDiplomacy.Model;

namespace MultiversalDiplomacy.Script;

public class ValidatedOrdersScriptHandler(World world, bool strict = false) : IScriptHandler
{
    public string Prompt => "valid> ";

    public World World { get; private set; } = world;

    /// <summary>
    /// Whether unsuccessful commands should terminate the script.
    /// </summary>
    public bool Strict { get; } = strict;

    public IScriptHandler? HandleInput(string input)
    {
        var args = input.Split(' ', StringSplitOptions.RemoveEmptyEntries);
        if (args.Length == 0)
        {
            return this;
        }

        var command = args[0];
        switch (command)
        {
            case "assert" when args.Length == 1:
                Console.WriteLine("Usage:");
                break;

            case "assert":
                string assertion = input["assert ".Length..];
                OrderRegex re = new(World);
                Regex prov = new($"{re.Province} (.*)");
                Match match = prov.Match(assertion);
                if (!match.Success) {
                    Console.WriteLine($"Could not parse province from {assertion}");
                    return Strict ? null : this;
                }
                // TODO look up order once orders are validated and adjudicated
                Console.WriteLine("Order lookup not implemented yet");
                return null;

            default:
                // noop on comments that begin with #
                if (command.StartsWith('#')) break;
                Console.WriteLine($"Unrecognized command: {command}");
                if (Strict) return null;
                break;
        }

        return this;
    }
}