using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class TileManagment : MonoBehaviour
{
    public const int BASIC_DIRECTIONS = 6;

    public static List<TileInfo> levelTiles = new List<TileInfo>();
    public static List<TileInfo> ariostTiles = new List<TileInfo>();

    public List<Material> tileMaterials;    

    public static float tileOffset;

    public static Vector3[] basicDirections;

    private void Awake()
    {
        for (int i = 0; i < transform.childCount; i++)
        {
            var tile = transform.GetChild(i).GetComponent<TileInfo>();
            if (tile)
            {
                levelTiles.Add(tile);
                SetTileStartParams(tile);
                if (tile.tileOwnerIndex == TileOwner.Ariost)
                {
                    ariostTiles.Add(tile);
                }
            }
        }

        tileOffset = Vector3.Distance(levelTiles[0].tilePosition, levelTiles[3].tilePosition);

        basicDirections = GetBasicDirections(BASIC_DIRECTIONS);
        
    }    

    private void Start()
    {
        //Debug.Log("We have "+ levelTiles.Count + " tiles on this level");
        //Debug.Log("Tiles offset "+ _tilesOffset +" units");
        //Debug.Log(GetTile(new Vector3(0f, 0f, 0f), new Vector3(-0.9f, 0f, 1.7f), 1));
        if (tileMaterials.Count == 0)
        {
            Debug.LogError("You need to set tile materials to TileManagment");
        }


    }

    private void SetTileStartParams(TileInfo tile)
    {
        tile.tilePosition = tile.transform.position;
        tile.GetComponent<Renderer>().material = tileMaterials[(int)tile.tileOwnerIndex];
    }

    public void ChangeTileOwner(TileInfo tile, TileOwner ownerIndex)
    {
        tile.tileOwnerIndex = ownerIndex;
        tile.GetComponent<Renderer>().material = tileMaterials[(int)tile.tileOwnerIndex];

        ariostTiles.Add(tile);

        //Debug.Log(GetOtherTiles(tile).Count);
        CheckSurroundedTiles(levelTiles, ownerIndex, tile);
        //Debug.Log("Captured " + tile.name);
    }    

    public static void AssignBuildingToTile(TileInfo tile, GameObject building)
    {
        tile.buildingOnTile = building;
        tile.canMove = false;
        tile.canBuildHere = false;
    }

    public static TileInfo GetTile(Vector3 position)
    {
        TileInfo resultTile = levelTiles[0];
        foreach (TileInfo tile in levelTiles)
        {
            if (Vector3.Distance(position, tile.tilePosition) < Vector3.Distance(position, resultTile.tilePosition))
            {
                resultTile = tile;
            }            
        }
        if (Vector3.Distance(position, resultTile.tilePosition) > tileOffset/2)
        {
            return null;
        }
        else 
        {
            return resultTile;
        }        
    }

    public static TileInfo GetTile(Vector3 currentTilePosition, Vector3 direction, float distance)
    {
        direction = direction.normalized;
        distance = distance -  0.1f;
        Vector3 tilePos = currentTilePosition + (direction * distance*tileOffset);
        return GetTile(tilePos);
    }

    public static List<TileInfo> GetOtherTiles(TileInfo currentTile, TileOwner ownerIndex)
    {
        List<TileInfo> otherTiles = new List<TileInfo>();
        //int notMyTiles = 0;
        foreach (Vector3 dir in basicDirections)
        {
            var tile = GetTile(currentTile.tilePosition + dir * TileManagment.tileOffset);
            if (tile)
            {
                if (tile.tileOwnerIndex != ownerIndex)
                {
                    //notMyTiles++;
                    otherTiles.Add(tile);
                }
            }
        }
        //Debug.Log("We have " + notMyTiles + " not my tiles around " + currentTile.name);
        return otherTiles;
    }

    public static Vector3[] GetBasicDirections(int directionsAmount)
    {
        Vector3[] tempArr = new Vector3[directionsAmount];
        float deltaAngle = 360 / directionsAmount;
        for (int i = 0; i < directionsAmount; i++)
        {
            tempArr[i] = Quaternion.AngleAxis(i * deltaAngle, Vector3.up) * Vector3.right;
        }
        //Debug.Log(tempArr);
        return tempArr;
    }

    public static void CheckSurroundedTiles(List<TileInfo> tiles, TileOwner ownerIndex, TileInfo startTile)
    {
        foreach (TileInfo tile in tiles)
        {
            tile.isChecked = false;
        }
        List<TileInfo> firstAdjacentTiles = GetOtherTiles(startTile, ownerIndex);
        foreach (TileInfo tile in firstAdjacentTiles)
        {
            SetSurroundedTiles(tiles, ownerIndex, tile);
        }
    }
    public static void SetSurroundedTiles(List<TileInfo> tiles, TileOwner ownerIndex, TileInfo startTile)
    {
        List<TileInfo> surroundedTiles = new List<TileInfo>();
        var q = new Queue<TileInfo>(tiles.Count);
        q.Enqueue(startTile);
        int iterations = 0;

        while (q.Count > 0)
        {
            var tile = q.Dequeue();
            //Debug.Log("current tile " + tile.name);

            if (q.Count > tiles.Count)
            {
                throw new Exception("The algorithm is probably looping. Queue size: " + q.Count);
            }

            if (tile.isBorderTile)  //we are in a wrong area
            {
                //Debug.Log("FindBorder");
                surroundedTiles.Clear();
                return;
            }

            if (surroundedTiles.Contains(tile))
            {
                continue;
            }

            surroundedTiles.Add(tile);
            tile.isChecked = true;

            var adjacentTiles = GetOtherTiles(tile, ownerIndex);
            //Debug.Log("second tiles "+ adjacentTiles.Count);
            foreach (TileInfo newTile in adjacentTiles)
            {
                q.Enqueue(newTile);                
            }

            iterations++;
        }
        //Debug.Log("Found " +surroundedTiles.Count + " tiles");
        //Debug.Log("Iterations " + iterations);

        foreach (TileInfo tile in surroundedTiles)
        {
            tile.whoCanEasyGetTile = ownerIndex;
        }
        Debug.Log("Surrounded " + surroundedTiles.Count);
    }
}