using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Sirenix.OdinInspector;

namespace KairoEngine.Grids
{
    [System.Serializable]
    public class PlaceableObjectRule
    {
        public enum Rule
        {
            EmptyCell,
            Connection,
            CellOcupied,
            AdjacentCellOcupied,
            AdjacentEmptyCell,
            CellInRadius,
            EmptyArea
        }

        private string title 
        {
            get 
            {
                switch (rule)
                {
                    case Rule.EmptyCell:
                        return $"Empty cell";
                    case Rule.Connection:
                        return $"Has connector";
                    case Rule.CellOcupied:
                        if(targetObject != null) return $"Cell ocupied by \"{targetObject?.title}\"";
                        else return $"Cell ocupied (ERROR)";
                    case Rule.AdjacentCellOcupied:
                        if(targetObject != null) return $"{objDir.ToString()} cell ocupied by \"{targetObject?.title}\"";
                        else return $"{objDir.ToString()} cell ocupied (ERROR)";
                    case Rule.AdjacentEmptyCell:
                        return $"{objDir.ToString()} cell is empty";
                    case Rule.CellInRadius:
                        if(targetObject != null) return $"\"{targetObject?.title}\" is in a {radius} cell radius";
                        else return $"Cell in radius (ERROR)";
                    case Rule.EmptyArea:
                        return $"Empty cells in a {radius} cell radius";
                    default:
                        return "?";
                }
            }
        }

        [SerializeField, FoldoutGroup("@title")] private Rule rule = Rule.EmptyCell;

        [ShowIf("@rule == Rule.CellOcupied || rule == Rule.AdjacentCellOcupied || rule == Rule.CellInRadius")]
        [SerializeField, FoldoutGroup("@title")] private PlacedObjectType targetObject;

        [ShowIf("@rule == Rule.AdjacentCellOcupied || rule == Rule.AdjacentEmptyCell")]
        [SerializeField, FoldoutGroup("@title")] private PlacedObjectType.Dir objDir;

        [ShowIf("@rule == Rule.CellInRadius || rule == Rule.EmptyArea")]
        [SerializeField, FoldoutGroup("@title")] private int radius = 3;

        [ShowIf("@rule == Rule.Connection")]
        [SerializeField, FoldoutGroup("@title")] private string connector = "connector name";


        public bool Evaluate(Grid<GridObject> grid, PlacedObjectType placedObjectType, int x, int y, PlacedObjectType.Dir dir)
        {
            switch (rule)
            {
                case Rule.EmptyCell:
                    return IsEmptyCells(grid, placedObjectType, x, y, dir);
                case Rule.Connection:
                    return HasConnection(grid, placedObjectType, x, y, dir);
                case Rule.CellOcupied:
                    break;
                case Rule.AdjacentCellOcupied:
                    break;
                case Rule.AdjacentEmptyCell:
                    break;
                case Rule.CellInRadius:
                    break;
                case Rule.EmptyArea:
                    break;
                default:
                    break;
            }
            return false;
        }

        public Rule GetRule() => rule;
        public PlacedObjectType GetTargetObject() => targetObject;
        public int GetRadius() => radius;
        public string GetConnector() => connector;

        public bool IsEmptyCells(Grid<GridObject> grid, PlacedObjectType placedObjectType, int x, int z, PlacedObjectType.Dir dir)
        {
            GridObject gridObject = grid.GetObject(x, z);
            if(gridObject == null) return false;
            List<Vector2Int> gridPositionList = placedObjectType.GetGridPositionList(new Vector2Int(x, z), dir);
            bool canBuild = true;
            foreach (var gridPosition in gridPositionList)
            {
                var obj = grid.GetObject(gridPosition.x, gridPosition.y);
                if(obj != null)
                {
                    if(!grid.GetObject(gridPosition.x, gridPosition.y).CanBuild()) canBuild = false;
                }
                else canBuild = false;
            }
            return canBuild;
        }

        public bool HasConnection(Grid<GridObject> grid, PlacedObjectType placedObjectType, int x, int z, PlacedObjectType.Dir dir)
        {
            for (int i = 0; i < placedObjectType.connectors.Count; i++)
            {
                Vector2Int pos = new Vector2Int(x, z);
                pos = pos + placedObjectType.GetConnectorPositionOffset(i, dir);
                Vector2Int targetPos = pos + placedObjectType.GetConnectorTargetPositionOffset(i, dir);
                GridObject gridObject = grid.GetObject(targetPos.x, targetPos.y);
                
                if(gridObject == null) continue;
                if(gridObject.GetPlacedObject() == null) continue;
                if(gridObject.GetPlacedObject().HasConnection(placedObjectType.connectors[i].title, pos.x, pos.y)) 
                {
                    //Debug.Log($"Connector found from {pos} to {targetPos}");
                    return true;
                }
                else
                {
                    //Debug.Log($"No connector found from {pos} to {targetPos}");
                }
            }
            return false;
        }
    }
}