using System.Text.Json.Nodes;
using System.Text.Json.Serialization;

namespace KOTH;

public record GameModeInfo(
	[property: JsonIgnore] string Path,
	string Title,
	string Description);

partial class GameMode
{
	/// <summary>
	/// Gets all game modes referenced by a scene.
	/// </summary>
	public static IReadOnlyList<GameModeInfo> GetAll(SceneFile scene)
	{
		var list = new List<GameModeInfo>();

		foreach (var go in scene?.GameObjects)
		{
			if (go == null)
				continue;

			GetAll(go, "", list);
		}

		return list;
	}

	private static void GetAll(JsonObject go, string path, List<GameModeInfo> infos)
	{
		if (!go.TryGetPropertyValue("Enabled", out var enabledNode) || enabledNode?.GetValue<bool>() is not true)
		{
			return;
		}

		if (!go.TryGetPropertyValue("Name", out var nameNode) || nameNode?.GetValue<string>() is not { } name)
		{
			return;
		}

		path = $"{path}/{name}";

		// TODO: actually support prefab variables properly, instead of hard coding "Title" and "Description"

		string titleOverride = null;
		string descriptionOverride = null;

		if (go.TryGetPropertyValue("__Prefab", out var prefabNode)
			&& prefabNode?.GetValue<string>() is { } prefabPath
			&& ResourceLibrary.TryGet<PrefabFile>(prefabPath, out var prefabFile))
		{
			if (go.TryGetPropertyValue("__PrefabVariables", out var variables))
			{
				titleOverride = variables?["Title"]?.GetValue<string>();
				descriptionOverride = variables?["Description"]?.GetValue<string>();
			}

			go = prefabFile.RootObject;
		}

		if (go.TryGetPropertyValue("Components", out var componentsNode) && componentsNode is JsonArray components)
		{
			foreach (var component in components.Select(x => x.AsObject()))
			{
				if (!component.TryGetPropertyValue("__type", out var typeNode)
					|| !string.Equals(typeNode?.GetValue<string>(), typeof(GameMode).FullName, StringComparison.OrdinalIgnoreCase))
				{
					continue;
				}

				var info = (GameModeInfo)Json.FromNode(component, typeof(GameModeInfo)) with { Path = path };

				info = info with
				{
					Title = titleOverride ?? info.Title,
					Description = descriptionOverride ?? info.Description
				};

				infos.Add(info);
			}
		}

		if (!go.TryGetPropertyValue("Children", out var childrenNode) || childrenNode is not JsonArray children)
		{
			return;
		}

		foreach (var child in children)
		{
			GetAll(child.AsObject(), path, infos);
		}
	}
}