using UnityEngine;

public class ObjectPlaceholder : UnitPlaceholder
{
    public GameObject Prefab { get; set; }
    public override void Place()
    {
        base.Place();
        Prefab.Create(transform.position, parent : LevelManager.Instance.LevelTransform);
    }
    public override bool CanBePlacedHere()
    {
        //bool isTileEmpty = !LevelManager.Instance.Has<ILevelObject>(obj => obj.Position.IsContainedIn(transform.position));
        bool isHarvesterAndAllowed = IsHarvesterAndAllowed();

        var objsOnPosition = LevelManager.Instance.GetAll<ILevelObject>(obj => obj.Position.IsContainedIn(transform.position));
        var positionIsCollidable = objsOnPosition.Exists(obj => obj.IsCollidable);

        // Look if tile is already used by an ally
        var isTileBusy = false;
        Transform[] children = LevelManager.Instance.LevelTransform.GetComponentsInChildren<Transform>();
        foreach (Transform tr in children)
        {
            Debug.Log(tr);
            if (tr == null || tr.tag != "Ally") break;
            float distance = Vector2.Distance(transform.position, tr.position);
            Debug.Log("distance : " + distance);
            if (distance <= 0.5f)
            {
                Debug.Log("distance ahah: " + distance);
                isTileBusy = true;
                break;
            }
        }

        var defaultUnitCost = GlobalConfig.Instance.Current.populationCostPerUnit;
        return !positionIsCollidable
            && LevelBoundCache.Contains(transform.position)
            && ResourceManager.Instance.EnoughFor(Rock, Wood, Food)
            && (Prefab.GetComponent<Building>()
            || ResourceManager.Instance.EnoughPopulationFor(defaultUnitCost))
            && isHarvesterAndAllowed
            && !isTileBusy;
    }

    private bool IsHarvesterAndAllowed()
    {
        Ally unit = Prefab.GetComponent<Ally>();
        
        //Obtiens info correctement.
        LevelTile pointedTile = LevelManager.Instance.Get<LevelTile>(obj => obj.Position.IsContainedIn(transform.position));

        return unit is not Harvester || (unit is Harvester && IsAllowedTile(pointedTile));
    }

    private bool IsAllowedTile(LevelTile pointedTile)
    {
        return pointedTile is ResourceTile;
    }
}