Initial commit: Theriapolis baseline at port/godot branch point

Captures the pre-Godot-port state of the codebase. This is the rollback anchor for the Godot port (M0 of theriapolis-rpg-implementation-plan-godot-port.md). All Phase 0 through Phase 6.5 work is included; Phase 7 is in flight. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-04-30 20:40:51 -07:00
commit b451f83174
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+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
+using Microsoft.Xna.Framework.Input;
+using Myra.Graphics2D.UI;
+using Theriapolis.Core;
+using Theriapolis.Core.Persistence;
+using Theriapolis.Game.Platform;
+
+namespace Theriapolis.Game.Screens;
+
+/// <summary>
+/// Slot picker. Lists C.SAVE_SLOT_COUNT slots plus the autosave slot. Reading
+/// each slot only deserializes the JSON header (cheap), so opening the picker
+/// is fast even if there are many large saves.
+///
+/// Phase 4 mode: load only (called from TitleScreen). Save-from-game uses the
+/// F5 quicksave; a save-as-slot UI can be added later by extending this screen
+/// with an Action.
+/// </summary>
+public sealed class SaveLoadScreen : IScreen
+{
+    private Game1 _game = null!;
+    private Desktop _desktop = null!;
+
+    public void Initialize(Game1 game)
+    {
+        _game = game;
+        BuildUI();
+    }
+
+    private void BuildUI()
+    {
+        var root = new VerticalStackPanel
+        {
+            Spacing             = 8,
+            HorizontalAlignment = HorizontalAlignment.Center,
+            VerticalAlignment   = VerticalAlignment.Center,
+        };
+
+        root.Widgets.Add(new Label
+        {
+            Text = "LOAD GAME",
+            HorizontalAlignment = HorizontalAlignment.Center,
+        });
+        root.Widgets.Add(new Label { Text = " " });
+
+        // Autosave row first.
+        AddSlotRow(root, "Autosave", SavePaths.AutosavePath());
+        for (int i = 1; i <= C.SAVE_SLOT_COUNT; i++)
+            AddSlotRow(root, $"Slot {i:D2}", SavePaths.SlotPath(i));
+
+        root.Widgets.Add(new Label { Text = " " });
+        var back = new TextButton { Text = "Back", Width = 200, HorizontalAlignment = HorizontalAlignment.Center };
+        back.Click += (_, _) => _game.Screens.Pop();
+        root.Widgets.Add(back);
+
+        _desktop = new Desktop { Root = root };
+    }
+
+    private void AddSlotRow(VerticalStackPanel parent, string label, string path)
+    {
+        string text = label;
+        bool exists = File.Exists(path);
+        bool compatible = false;
+        if (exists)
+        {
+            try
+            {
+                var bytes = File.ReadAllBytes(path);
+                var header = SaveCodec.DeserializeHeaderOnly(bytes);
+                if (SaveCodec.IsCompatible(header))
+                {
+                    text = $"{label}: {header.SlotLabel()}";
+                    compatible = true;
+                }
+                else
+                {
+                    text = $"{label}: <v{header.Version} — incompatible (Phase 5+ only)>";
+                }
+            }
+            catch
+            {
+                text = $"{label}: <unreadable>";
+            }
+        }
+        else
+        {
+            text = $"{label}: <empty>";
+        }
+
+        var btn = new TextButton
+        {
+            Text  = text,
+            Width = 480,
+            HorizontalAlignment = HorizontalAlignment.Center,
+        };
+        if (exists && compatible) btn.Click += (_, _) => LoadSlot(path);
+        else                       btn.Enabled = false;
+        parent.Widgets.Add(btn);
+    }
+
+    private void LoadSlot(string path)
+    {
+        try
+        {
+            var bytes = File.ReadAllBytes(path);
+            var headerOnly = SaveCodec.DeserializeHeaderOnly(bytes);
+            if (!SaveCodec.IsCompatible(headerOnly))
+            {
+                var err = new Label
+                {
+                    Text = SaveCodec.IncompatibilityReason(headerOnly),
+                    HorizontalAlignment = HorizontalAlignment.Center,
+                };
+                _desktop.Root = err;
+                return;
+            }
+            var (header, body) = SaveCodec.Deserialize(bytes);
+            _game.Screens.Pop(); // back to title
+            _game.Screens.Push(new WorldGenProgressScreen(header.ParseSeed(), restoreFromSave: body, savedHeader: header));
+        }
+        catch (Exception ex)
+        {
+            // Crude error display: replace the screen content with the error.
+            var err = new Label { Text = $"Load failed:\n{ex.Message}", HorizontalAlignment = HorizontalAlignment.Center };
+            _desktop.Root = err;
+        }
+    }
+
+    public void Update(GameTime gt)
+    {
+        if (Keyboard.GetState().IsKeyDown(Keys.Escape)) _game.Screens.Pop();
+    }
+
+    public void Draw(GameTime gt, SpriteBatch sb)
+    {
+        _game.GraphicsDevice.Clear(new Color(20, 20, 30));
+        _desktop.Render();
+    }
+
+    public void Deactivate() { }
+    public void Reactivate() { }
+}