using MultiversalDiplomacy.Model;

namespace MultiversalDiplomacy.Script;

/// <summary>
/// A script handler for interacting with a loaded game.
/// </summary>
public class GameScriptHandler : IScriptHandler
{
    public GameScriptHandler(World world)
    {
        World = world;
    }

    public string Prompt => "5dp> ";

    public World World { get; set; }

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

        var command = args[0];
        switch (command)
        {
            case "help":
            case "?":
                Console.WriteLine("commands:");
                Console.WriteLine("  adjudicate: adjudicate the current orders");
                Console.WriteLine("  assert: assert about the state of the game");
                Console.WriteLine("  list: list things in a game category");
                Console.WriteLine("  orders: submit order sets");
                Console.WriteLine("  status: overview of the state of the game");
                break;

            case "adjudicate":
                World = GameController.AdjudicateOrders(World);
                break;

            case "assert" when args.Length == 1:
                Console.WriteLine("usage:");
                Console.WriteLine("  assert timeline [timeline]@[turn]: timeline exists");
                Console.WriteLine("  assert unit [unit spec]: unit exists");
                break;

            case "assert" when args[1] == "timeline":
                // TODO: raise an error if the timeline doesn't exist
                Console.WriteLine("WIP");
                break;

            case "assert" when args[1] == "unit":
                // TODO: raise an error if the unit doesn't exist
                Console.WriteLine("WIP");
                break;

            case "list" when args.Length == 1:
                Console.WriteLine("usage:");
                Console.WriteLine("  list ordersets: unadjudicated order sets");
                Console.WriteLine("  list powers: the powers in the game");
                break;

            case "list" when args[1] == "ordersets":
                foreach (OrderSet orderSet in World.OrderSets.Where(os => !os.Adjudicated))
                {
                    var lines = orderSet.Text.Split('\n');
                    var firstLine = lines[0].Trim();
                    Console.WriteLine($"  {firstLine} ({lines.Length - 1} orders)");
                }
                break;

            case "list" when args[1] == "powers":
                Console.WriteLine("Powers:");
                foreach (Power power in World.Powers)
                {
                    Console.WriteLine($"  {power.Name}");
                }
                break;

            case "orders" when args.Length == 1:
                Console.WriteLine("usage: orders [power]");
                break;

            case "orders":
                if (World.Powers.Any(p => p.Name == args[1]))
                {
                    var handler = new OrderSetScriptHandler(this, World, input);
                    return handler;
                }
                Console.WriteLine("Unrecognized power");
                break;

            case "status":
                foreach (Season season in World.Seasons)
                {
                    Console.WriteLine($"{season}");
                    foreach (Unit unit in World.Units.Where(u => u.Season == season))
                    {
                        Console.WriteLine($"  {unit}");
                    }
                }
                break;

            default:
                Console.WriteLine("Unrecognized command");
                break;
        }

        return this;
    }
}