using Godot;

namespace WorldSim;

/// <summary>
/// Top-down 2D view + debug roster (SPEC §9).
/// Draws straight from simulation state every frame — no per-NPC nodes,
/// no camera: fixed screen-space layout, map on the left, roster on the
/// right. The player-facing game has no meters; the designer sees everything.
/// </summary>
public partial class Visualization : Node2D
{
    private GameManager _gm = null!;

    // Layout: 1600×900 window — map fills the left square, panel the right.
    private const float MapOffset = 10f;
    private const float MapPixels = 880f;
    private const float CellPixels = MapPixels / World.GridSize;   // ~3.44
    private const float PanelX = 910f;
    private const float PanelWidth = 680f;

    private static readonly Color PanelBg   = new(0.10f, 0.10f, 0.12f);
    private static readonly Color MapBg     = new(0.13f, 0.13f, 0.15f);
    private static readonly Color TextDim   = new(0.65f, 0.65f, 0.70f);
    private static readonly Color TextMain  = new(0.92f, 0.92f, 0.95f);

    public override void _Ready()
    {
        _gm = GetParent<GameManager>();
    }

    public override void _Process(double delta) => QueueRedraw();

    private static Color StateColor(NpcState state) => state switch
    {
        NpcState.Gathering   => Colors.White,
        NpcState.Building    => Colors.Orange,
        NpcState.Trading     => Colors.Yellow,
        NpcState.Resting     => new Color(0.45f, 0.45f, 0.95f),
        NpcState.Socializing => new Color(0.9f, 0.4f, 0.9f),
        _ => Colors.Red,
    };

    private static Vector2 MapPos(Vector2 gridPos) =>
        new(MapOffset + gridPos.X * CellPixels, MapOffset + gridPos.Y * CellPixels);

    public override void _Draw()
    {
        if (_gm.World == null) return;
        var font = ThemeDB.FallbackFont;

        // --- Backgrounds --------------------------------------------------
        DrawRect(new Rect2(MapOffset, MapOffset, MapPixels, MapPixels), MapBg);
        DrawRect(new Rect2(PanelX, 0, PanelWidth, 900), PanelBg);

        // --- Map: resource nodes -----------------------------------------
        foreach (var node in _gm.World.Nodes)
        {
            Color c = node.Kind switch
            {
                MaterialKind.Wood  => new Color(0.20f, 0.55f, 0.20f),
                MaterialKind.Stone => new Color(0.55f, 0.55f, 0.55f),
                MaterialKind.Clay  => new Color(0.75f, 0.45f, 0.25f),
                MaterialKind.Water => new Color(0.25f, 0.45f, 0.85f),
                MaterialKind.Food  => new Color(0.80f, 0.30f, 0.40f),
                _ => Colors.Magenta,
            };
            // Fade toward depletion so dying groves read at a glance
            if (node.Kind != MaterialKind.Water)
                c = c.Darkened(0.65f * (1f - node.Amount / node.MaxAmount));
            var p = MapPos(node.Cell);
            DrawRect(new Rect2(p.X, p.Y, CellPixels, CellPixels), c);
        }

        // --- Map: town labels --------------------------------------------
        foreach (var town in _gm.Towns)
        {
            var tp = MapPos(town.Center);
            DrawString(font, tp + new Vector2(-20f, -14f), town.Name.ToUpper(),
                fontSize: 13, modulate: TextDim);
        }

        // --- Map: buildings ----------------------------------------------
        for (int i = 0; i < _gm.Buildings.Count; i++)
        {
            var b = _gm.Buildings[i];
            Color c = b.IsRuined   ? new Color(0.25f, 0.23f, 0.20f)
                    : b.Kind == BuildingKind.Granary
                                   ? (b.IsComplete ? new Color(0.55f, 0.70f, 0.40f)
                                                   : new Color(0.45f, 0.52f, 0.32f))
                    : b.IsComplete ? new Color(0.9f, 0.85f, 0.6f).Darkened((1f - b.Condition) * 0.5f)
                    :                new Color(0.6f, 0.5f, 0.3f);
            float size = CellPixels + 3f + (b.CurrentStage + b.StageProgress) * 2f + b.Modules * 1.5f;
            var p = MapPos(b.Site);
            DrawRect(new Rect2(p.X - size / 2f, p.Y - size / 2f, size, size), c);
            DrawString(font, p + new Vector2(size / 2f + 2f, 4f), $"{i + 1}",
                fontSize: 10, modulate: TextDim);
        }

        // --- Map: NPCs with roster numbers -------------------------------
        for (int i = 0; i < _gm.Npcs.Count; i++)
        {
            var npc = _gm.Npcs[i];
            var p = MapPos(npc.Position);
            // Selfish souls get a dark red ring — same dot, different halo.
            if (npc.Soul.Type == SoulType.Selfish)
                DrawCircle(p, 5.5f, new Color(0.75f, 0.15f, 0.15f));
            // Debris dims the dot — encasement made visible.
            DrawCircle(p, 3.5f, StateColor(npc.State).Darkened(npc.Imprint.Total * 0.7f));
            DrawString(font, p + new Vector2(5f, -4f), $"{i + 1}",
                fontSize: 11, modulate: TextMain);
        }

        // --- Panel: clock header -----------------------------------------
        DrawString(font, new Vector2(PanelX + 16, 30),
            $"Day {_gm.Day} · {_gm.SeasonName}   {_gm.MinuteOfDay / 60:00}:{_gm.MinuteOfDay % 60:00}   " +
            $"{(_gm.IsNight ? "· night" : "· day")}   {_gm.TicksPerRealSecond:0}x",
            fontSize: 18, modulate: TextMain);

        // --- Panel: villager roster --------------------------------------
        float y = 66f;
        DrawString(font, new Vector2(PanelX + 16, y), "VILLAGERS",
            fontSize: 13, modulate: TextDim);
        y += 10f;

        for (int i = 0; i < _gm.Npcs.Count; i++)
        {
            var npc = _gm.Npcs[i];
            y += 20f;

            if (npc.Soul.Type == SoulType.Selfish)
                DrawCircle(new Vector2(PanelX + 24, y - 5f), 6f, new Color(0.75f, 0.15f, 0.15f));
            DrawCircle(new Vector2(PanelX + 24, y - 5f), 4.5f,
                StateColor(npc.State).Darkened(npc.Imprint.Total * 0.7f));
            DrawString(font, new Vector2(PanelX + 36, y),
                $"{i + 1,2}  {npc.State,-11}  {npc.Activity}",
                fontSize: 13, modulate: TextMain);
            DrawString(font, new Vector2(PanelX + 390, y),
                $"N {npc.Nourishment * 100,3:0}  D {npc.Imprint.Total * 100,2:0}" +
                $"  K {npc.Know.Total,4:0.00}  A {npc.AgeDays,3:0}" +
                $"  {npc.DominantStateToday().ToString().ToLower()[..4]}",
                fontSize: 12, modulate: TextDim);
        }

        // --- Panel: buildings --------------------------------------------
        y += 34f;
        DrawString(font, new Vector2(PanelX + 16, y), "BUILDINGS",
            fontSize: 13, modulate: TextDim);
        y += 10f;

        for (int i = 0; i < _gm.Buildings.Count; i++)
        {
            var b = _gm.Buildings[i];
            y += 18f;
            string status = b.IsRuined ? "RUIN"
                : !b.IsComplete
                    ? $"building: {b.Stages[b.CurrentStage].Name} {b.StageProgress * 100,3:0}%"
                : b.Kind == BuildingKind.Granary
                    ? $"granary   food {b.FoodStock,5:0.0}/{Building.FoodStockCap:0}"
                    : $"cond {b.Condition * 100,3:0}%  wood {b.UpkeepStock,4:0.0}/{Building.UpkeepStockCap:0}" +
                      $"  mods {b.Modules}/{Building.ModuleCap}  burn {b.DailyBurn:0.0}/day";
            DrawString(font, new Vector2(PanelX + 36, y),
                $"{i + 1}  {b.Town,-5} {status}", fontSize: 12,
                modulate: b.IsRuined ? TextDim : TextMain);
        }

        // --- Panel: world totals -----------------------------------------
        y += 34f;
        float wood = 0f, stone = 0f, clay = 0f, foodTotal = 0f;
        foreach (var n in _gm.World.Nodes)
        {
            switch (n.Kind)
            {
                case MaterialKind.Wood:  wood      += n.Amount; break;
                case MaterialKind.Stone: stone     += n.Amount; break;
                case MaterialKind.Clay:  clay      += n.Amount; break;
                case MaterialKind.Food:  foodTotal += n.Amount; break;
            }
        }
        DrawString(font, new Vector2(PanelX + 16, y),
            $"WORLD   wood {wood:0}   stone {stone:0}   clay {clay:0}   food {foodTotal:0}",
            fontSize: 13, modulate: TextDim);
    }
}