using Godot;
using System;
using System.Collections.Generic;
using System.Linq;

public partial class EnemyController : TurnController
{
    
    public PackedScene _enemyScene = GD.Load<PackedScene>("res://Enemy.tscn");
    public List<Enemy> _enemies = new();
    public PlayerController _playerController;

    public void AddEnemies(int ENEMY_COUNT = 1)
    {
        for (int i = 0; i < ENEMY_COUNT; i++)
        {
            Enemy newEnemy = _enemyScene.Instantiate<Enemy>();
            newEnemy.Death += RemoveEnemy;

            newEnemy._speed = Globals._rng.Next(2,4+1);
            newEnemy.Modulate = new Color(newEnemy._speed == 2 ? "#FF0000" : newEnemy._speed == 3 ? "#00FF00" : "#0000FF");
            newEnemy._enemyController = this;
            List<Vector2I> unoccupied = [.. _playArea._map._bottomRow.Where(c => _enemies.All(e => e._address != c))];
            Vector2I randomCell = unoccupied[Globals._rng.Next(unoccupied.Count)];
            WarpEnemy(newEnemy, randomCell);
            _enemies.Add(newEnemy);
            AddChild(newEnemy);
        }
    }
    public void AddEnemies(List<Vector2I> POSITIONS)
    {
        for (int i = 0; i < POSITIONS.Count; i++)
        {
            Enemy newEnemy = _enemyScene.Instantiate<Enemy>();
            newEnemy.Death += RemoveEnemy;

            newEnemy._speed = Globals._rng.Next(2,4+1);
            newEnemy.Modulate = new Color(newEnemy._speed == 2 ? "#FF0000" : newEnemy._speed == 3 ? "#00FF00" : "#0000FF");
            newEnemy._enemyController = this;
            
            WarpEnemy(newEnemy, POSITIONS[i]);
            _enemies.Add(newEnemy);
            AddChild(newEnemy);
        }
        
    }

    public void Initiate()
    {
        List<Vector2I> positions = [.. _playArea.GetNode<TileMapLayer>("InitialPositions").GetUsedCells()];

        AddEnemies(positions);
    }

    public void MoveEnemies()
    {
        Tween tween = CreateTween();
        tween.SetParallel();
        Dictionary<Enemy, List<Vector2I>> enemyPaths = new();
        Dictionary<Enemy, int> enemyOffsets = new();
        _enemies = [.. _enemies.OrderBy(e => e._address.Y).ThenBy(e => e._address.X)];
        for (int i = 0; i < _enemies.Count; i++)
        {
            Enemy enemy = _enemies[i];
            List<Vector2I> path = _playArea._map.GetPath(enemy._address, new Vector2I(enemy._address.X, _playArea._map._minY));
            enemyPaths[enemy] = path;
            enemyOffsets[enemy] = 0;
        }

        int maxSpeed = _enemies.Max(e => e._speed);

        for (int i = 0; i < maxSpeed; i++)
        {
            for (int j = 0; j < _enemies.Count; j++)
            {
                Enemy enemy = _enemies[j];
                int offset = enemyOffsets[enemy];
                if (i >= enemy._speed - offset)
                {
                    continue;
                }
                List<Vector2I> path = enemyPaths[enemy];
                Vector2I cell = path[i - offset];

                if (_playArea._map.GetOccupant(cell) == null)
                {
                    _playArea._map.SetCellEnemy(enemy._address, null);
                    enemy._address = cell;
                    _playArea._map.SetCellEnemy(enemy._address, enemy);
                    if (j == 0)
                    {
                        tween.Chain();
                    }
                    else
                    {
                        tween.Parallel();
                    }
                    tween.TweenProperty(enemy, "global_position", _playArea._map.GetCellPositionFromAddress(enemy._address), .2f);
                }
                else
                {
                    enemyOffsets[enemy]++;
                }

            }
        }
        
        tween.TweenCallback(Callable.From(() => EmitSignal(SignalName.TurnDone)));
    }

    public void RemoveEnemy(Enemy ENEMY_TO_REMOVE)
    {
        _enemies.Remove(ENEMY_TO_REMOVE);
        ENEMY_TO_REMOVE.QueueFree();
    }

    public override void StartTurn()
    {
        AddEnemies(1);
        
        MoveEnemies();
        
    }

    public void WarpEnemy(Enemy ENEMY, Vector2I CELL)
    {

        _playArea._map.SetCellEnemy(ENEMY._address, null);
        ENEMY._address = CELL;
        
        _playArea._map.SetCellEnemy(ENEMY._address, ENEMY);
        ENEMY.GlobalPosition = _playArea._map.GetCellPositionFromAddress(CELL);
    }
}