using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Myra.Graphics2D;
using Myra.Graphics2D.Brushes;
using Myra.Graphics2D.UI;
using Theriapolis.Core;
using Theriapolis.Game.Platform;

namespace Theriapolis.Game.Screens;

/// <summary>
/// Phase 5 M6: shown when the player's death-save loop fails (3 cumulative
/// failures). Permadeath per the §9 resolved decision — the only option is
/// "Return to Title". The autosave_combat slot persists, so the player can
/// load it from the title screen and retry.
/// </summary>
public sealed class DefeatedScreen : IScreen
{
    private readonly string _causeOfDeath;
    private Game1 _game = null!;
    private Desktop _desktop = null!;
    private bool _enterWas = true;
    private bool _escWas   = true;

    public DefeatedScreen(string causeOfDeath = "")
    {
        _causeOfDeath = causeOfDeath ?? "";
    }

    public void Initialize(Game1 game)
    {
        _game = game;
        var root = new VerticalStackPanel
        {
            Spacing             = 14,
            HorizontalAlignment = HorizontalAlignment.Center,
            VerticalAlignment   = VerticalAlignment.Center,
            Padding             = new Thickness(50, 40, 50, 40),
            Background          = new SolidBrush(new Color(20, 0, 0, 230)),
        };
        root.Widgets.Add(new Label { Text = "YOU HAVE DIED", HorizontalAlignment = HorizontalAlignment.Center });
        root.Widgets.Add(new Label { Text = " " });
        if (!string.IsNullOrEmpty(_causeOfDeath))
        {
            root.Widgets.Add(new Label { Text = _causeOfDeath, HorizontalAlignment = HorizontalAlignment.Center });
            root.Widgets.Add(new Label { Text = " " });
        }
        root.Widgets.Add(new Label
        {
            Text = $"Your last autosave is at slot \"{C.SAVE_SLOT_AUTOSAVE_COMBAT}\".",
            HorizontalAlignment = HorizontalAlignment.Center,
        });
        root.Widgets.Add(new Label
        {
            Text = "Load from the title to retry the encounter.",
            HorizontalAlignment = HorizontalAlignment.Center,
        });
        root.Widgets.Add(new Label { Text = " " });

        var ret = new TextButton { Text = "Return to Title (ENTER)", Width = 280, HorizontalAlignment = HorizontalAlignment.Center };
        ret.Click += (_, _) => ReturnToTitle();
        root.Widgets.Add(ret);

        _desktop = new Desktop { Root = root };
    }

    private void ReturnToTitle()
    {
        // Pop everything above the TitleScreen. Stack at this point is:
        // Title → CharacterCreation (popped) → WorldGenProgress (popped) →
        // PlayScreen → CombatHUD (popped earlier) → DefeatedScreen.
        // So we need to pop DefeatedScreen + PlayScreen = 2 pops.
        // ScreenManager.Pop is queue-based now, so multiple calls all apply.
        _game.Screens.Pop();
        _game.Screens.Pop();
    }

    public void Update(GameTime gt)
    {
        var ks = Keyboard.GetState();
        bool enter = ks.IsKeyDown(Keys.Enter);
        bool esc   = ks.IsKeyDown(Keys.Escape);
        bool enterPressed = enter && !_enterWas;
        bool escPressed   = esc && !_escWas;
        _enterWas = enter; _escWas = esc;
        if (enterPressed || escPressed) ReturnToTitle();
    }

    public void Draw(GameTime gt, SpriteBatch sb)
    {
        // Don't clear — leave the play-screen's last frame underneath.
        _desktop.Render();
    }

    public void Deactivate() { }
    public void Reactivate() { }
}