#nullable enable

using System.Globalization;
using Godot;
using SideScrollerGame.Debug.Commands;

namespace SideScrollerGame.Debug;

public partial class DebugOverlay : CanvasLayer
{
    public override void _Ready()
    {
        Layer = 100;
        ProcessMode = ProcessModeEnum.Always;
        EnsureLabel();
    }

    public void SetStatus(DebugSettings settings, string loadedSceneId)
    {
        m_Settings = settings;
        m_LoadedSceneId = loadedSceneId;
        Label label = EnsureLabel();
        label.Text = $"Debug boot: {settings.BootMode}\nSeed: {settings.Seed}\nScene: {loadedSceneId}\nDebug: {OS.IsDebugBuild()}";
    }

    public void Bind(DebugCommandService service, DebugSettings settings, string loadedSceneId)
    {
        m_Service = service;
        m_Settings = settings;
        m_LoadedSceneId = loadedSceneId;
        service.StateChanged += _ => Refresh();
        Refresh();
    }

    public void SetHeroSummary(string summary)
    {
        m_HeroSummary = summary;
        Refresh();
    }

    private void Refresh()
    {
        Label label = EnsureLabel();
        if (m_Service is null || m_Settings is null)
        {
            return;
        }

        DebugRuntimeState state = m_Service.State;
        Visible = state.OverlayVisible;
        string heroLine = string.IsNullOrWhiteSpace(m_HeroSummary) ? string.Empty : $"\nHero: {m_HeroSummary}";
        label.Text = $"Debug boot: {m_Settings.BootMode}\n" + $"Scene: {m_LoadedSceneId}\n" + $"Seed: {state.Seed}\n" + $"Difficulty: {state.ActiveDifficultyId}\n" + $"Paused: {state.IsPaused}\n" + $"Time scale: {state.TimeScale.ToString(CultureInfo.InvariantCulture)}\n" + $"Marker: {DisplayOrNone(state.CurrentMarkerId)}\n" + $"Spawned: {state.SpawnedActorCount} ({DisplayOrNone(state.LastSpawnedActorId)})\n" + $"Flags: invuln={state.Invulnerable}, ammo={state.InfiniteSpecialAmmo}, nofire={state.NoEnemyFire}\n" + $"Debug draw: collisions={state.ShowCollisionShapes}, bounds={state.ShowGameplayBounds}" + heroLine;
    }

    private Label EnsureLabel()
    {
        if (m_StatusLabel is not null)
        {
            return m_StatusLabel;
        }

        m_StatusLabel = GetNodeOrNull<Label>("StatusLabel");
        if (m_StatusLabel is null)
        {
            m_StatusLabel = new Label { Name = "StatusLabel" };
            AddChild(m_StatusLabel);
        }

        m_StatusLabel.MouseFilter = Control.MouseFilterEnum.Ignore;
        m_StatusLabel.Position = new Vector2(8.0f, 8.0f);
        m_StatusLabel.AutowrapMode = TextServer.AutowrapMode.Off;
        return m_StatusLabel;
    }

    private static string DisplayOrNone(string value)
    {
        return string.IsNullOrWhiteSpace(value) ? "none" : value;
    }

    private Label? m_StatusLabel;
    private DebugCommandService? m_Service;
    private DebugSettings? m_Settings;
    private string m_LoadedSceneId = "none";
    private string m_HeroSummary = string.Empty;
}