using System;
using Sandbox;

namespace Editor.SuperShot;

public static class SuperShotContext
{
	public static Transform FreecamTransform { get; private set; }
	public static float FreecamFov { get; private set; } = 70f;
	public static float FreecamZNear { get; private set; } = 1f;
	public static float FreecamZFar { get; private set; } = 100000f;

	static RealTimeSince _sinceFreecamUpdate = 1000f;

	// Last resolved freecam, so a capture taken while the scene view isn't "current" still mirrors it.
	static Transform _lastGoodTransform;
	static float _lastGoodFov;
	static float _lastGoodZNear = 1f;
	static float _lastGoodZFar = 100000f;
	static bool _hasLastGood;

	public static bool HasFreecam => _sinceFreecamUpdate < 0.5f;

	public static void UpdateFreecam( Transform transform, float fov, float zNear, float zFar )
	{
		FreecamTransform = transform;
		FreecamFov = fov;
		FreecamZNear = MathX.Clamp( zNear, 1f, 1000f );
		FreecamZFar = zFar;
		_sinceFreecamUpdate = 0f;

		Remember( transform, FreecamFov, FreecamZNear, FreecamZFar );
	}

	static void Remember( Transform transform, float fov, float zNear, float zFar )
	{
		_lastGoodTransform = transform;
		_lastGoodFov = fov;
		_lastGoodZNear = zNear;
		_lastGoodZFar = zFar;
		_hasLastGood = true;
	}

	public static bool TryResolveFreecam( out Transform transform, out float fov, out float zNear, out float zFar )
	{
		var viewport = SceneViewWidget.Current?.LastSelectedViewportWidget;
		if ( viewport?.State is not null )
		{
			transform = new Transform( viewport.State.CameraPosition, viewport.State.CameraRotation );
			fov = EditorPreferences.CameraFieldOfView;
			zNear = MathX.Clamp( EditorPreferences.CameraZNear, 1f, 1000f );
			zFar = EditorPreferences.CameraZFar;
			Remember( transform, fov, zNear, zFar );
			return true;
		}

		if ( HasFreecam )
		{
			transform = FreecamTransform;
			fov = FreecamFov;
			zNear = FreecamZNear;
			zFar = FreecamZFar;
			Remember( transform, fov, zNear, zFar );
			return true;
		}

		if ( _hasLastGood )
		{
			transform = _lastGoodTransform;
			fov = _lastGoodFov;
			zNear = _lastGoodZNear;
			zFar = _lastGoodZFar;
			return true;
		}

		transform = default;
		fov = FreecamFov;
		zNear = FreecamZNear;
		zFar = FreecamZFar;
		return false;
	}

	public static Scene ActiveScene => SceneEditorSession.Active?.Scene;

	// True while playing and still following the game camera (not ejected to the free-fly editor camera).
	public static bool IsAttachedGameView
		=> SceneViewWidget.Current?.CurrentView == SceneViewWidget.ViewMode.Game;

	// Attached-play uses the live game camera the player sees; ejected/not-playing honours Shot Preferences.
	public static CaptureSource EffectiveSource( CaptureSettings settings )
		=> IsAttachedGameView ? CaptureSource.SceneMainCamera : settings.Source;

	public static float DesiredAspect { get; set; } = 16f / 9f;

	public static (int width, int height) ResolveSize( CaptureSettings s )
	{
		return s.Resolution switch
		{
			ShotResolution.OneK => (1024, 576),
			ShotResolution.HD720 => (1280, 720),
			ShotResolution.HD1080 => (1920, 1080),
			ShotResolution.QHD1440 => (2560, 1440),
			ShotResolution.UHD4K => (3840, 2160),
			ShotResolution.UHD5K => (5120, 2880),
			ShotResolution.UHD8K => (7680, 4320),
			ShotResolution.Square1080 => (1080, 1080),
			ShotResolution.Square4K => (3840, 3840),
			ShotResolution.Portrait => (1080, 1920),
			ShotResolution.Ultrawide1440 => (3440, 1440),
			ShotResolution.Ultrawide1080 => (2560, 1080),
			ShotResolution.Cinematic => (3840, 1646),
			ShotResolution.YouTubeThumbnail => (1280, 720),
			ShotResolution.PackageSquare => (512, 512),
			ShotResolution.PackageWide => (910, 512),
			ShotResolution.PackageTall => (512, 910),
			ShotResolution.Custom => (Math.Max( 64, s.CustomWidth ), Math.Max( 64, s.CustomHeight )),
			_ => (1920, 1080)
		};
	}
}