using System;
using System.Diagnostics;
using Babushka.scripts.CSharp.Common.SceneManagement;
using Godot;

namespace Babushka.scripts.CSharp.Common.Fight;

public partial class FightSceneSwitcher : Node
{
    [Export] private Node sceneRoot;
    [Export] private string fightRoomScenePath;
    [Export] private string fightHappeningScene;

    private void LoadNext()
    {
        var nextRoom = FightWorld.Instance.currentRoom;
        Debug.Assert(nextRoom != null, "nextRoom!=null");
        var nextFightHappening = FightWorld.Instance.fightHappeningData;
        SceneTransitionThreaded.Instance.ChangeSceneToFile(nextFightHappening != null
            ? fightHappeningScene
            : fightRoomScenePath);
        UnloadAfterDelay();
    }

    private async void UnloadAfterDelay()
    {
        await ToSignal(GetTree().CreateTimer(1.0f), "timeout"); // 1.0f seconds
        //sceneRoot.QueueFree();
    }

    public void SwitchRoom(int pathIndex)
    {
        Debug.Assert(FightWorld.Instance.currentRoom != null, "FightWorld.Instance.currentRoom!=null");
        
        if (!FightWorld.Instance.currentRoom.paths.TryGetValue(pathIndex, out var nextRoom))
            throw new Exception("Trying to go down a non-existent path");

        FightWorld.Instance.currentRoom = nextRoom;
        LoadNext();
    }

    public void SwitchToFight(FightWorld.FighterGroup enemyGroup)
    {
        if (FightWorld.Instance.fightHappeningData != null)
            throw new Exception("Trying to start a fight while already in a fight");

        FightWorld.Instance.fightHappeningData = new FightWorld.FightHappeningData
        {
            enemyGroup = enemyGroup,
        };
        LoadNext();
    }

    public void ExitFight()
    {
        if (FightWorld.Instance.fightHappeningData == null)
            throw new Exception("Trying to exit a fight while not in a fight");

        FightWorld.Instance.fightHappeningData = null;
        LoadNext();
    }
}