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

public class MapManager : MonoBehaviour
{
    [Header("[--------------- Map Objects ---------------]")]
    public List<MapObject> maps = new List<MapObject>();
    private string currentMapName;
    private List<GameObject> currentMapObjects = new List<GameObject>();
    private AbstractMap mapScript;
    private WaveManager waveScript;
    private AbstractWaveLogic waveLogicScript;

    public void Start()
    {
        if(Application.isEditor)
        {
            ValidateMapObjects();
        }

        // TODO: To move and call once we do need the map. (the task will be to do when we add menus)
        InitializeMap(maps[0].name);

        // TODO: Remove me once tests are done
        //GetComponent<StoreManager>().SetStoreObject(FindCurrentMapInList().store);
        //GetComponent<StoreManager>().OpenStore();
    }

    private void InitializeMap(string mapName)
    {
        if (currentMapName != null)
            DestroyMap();

        currentMapName = mapName;
        MapObject map = FindCurrentMapInList();
        
        if(map == null)
        {
            Debug.LogError("Could not find map " + currentMapObjects + " in list of map objects");
            return;
        }

        SpawnAllMapPrefabs(map);
        SpawnMapScript(map);
        GetComponent<StoreManager>().SetStoreObject(map.store);
    }

    private void SpawnMapScript(MapObject map)
    {
        if (String.IsNullOrEmpty(map.mapScriptName))
        {
            map.mapScriptName = map.name.Replace("Object", "");
        }

        try
        {
            mapScript = (AbstractMap) gameObject.AddComponent(Type.GetType(map.mapScriptName));
            mapScript.OnMapLoaded();
        }
        catch(Exception e)
        {
            Debug.LogError("MapScriptName " + map.mapScriptName + " is wrong: " + e.Message);
        }

    }

    public void SpawnWaveScript()
    {
        MapObject map = FindCurrentMapInList();

        if (map == null)
        {
            Debug.LogError("Could not find map " + currentMapObjects + " in list of map objects");
            return;
        }

        SpawnWaveScript(map);
    }

    private void SpawnWaveScript(MapObject map)
    {
        if (String.IsNullOrEmpty(map.waveLogicScriptName))
        {
            Debug.LogError("Map Object " + map.name + " has an empty wave script name.");
            return;
        }

        try
        {
            waveScript = gameObject.AddComponent<WaveManager>();
            waveLogicScript = (AbstractWaveLogic) gameObject.AddComponent(Type.GetType(map.waveLogicScriptName));
            waveScript.Prepare(map.waveObjects[GameManager.Instance.GetDifficulty()], waveLogicScript);
        }
        catch (Exception e)
        {
            Debug.LogError("WaveLogicScriptName " + map.waveLogicScriptName + " is wrong: " + e.Message);
        }

    }

    private void DestroyMap()
    {
        MapObject map = FindCurrentMapInList();

        if (map == null)
        {
            Debug.LogError("Could not find map " + currentMapObjects + " in list of map objects");
            return;
        }

        DespawnAllMapPrefabs();
        DespawnMapScript();
        DespawnWaveScript();
        GetComponent<StoreManager>().CloseStore();
        currentMapName = null;
    }

    private void DespawnMapScript()
    {
        if (mapScript == null)
            return;

        mapScript.OnMapUnloaded();
        Destroy(gameObject.GetComponent(mapScript.GetType()));
    }

    private void DespawnWaveScript()
    {
        if (waveScript == null || waveLogicScript == null)
            return;

        waveScript.DestroyActions();
        Destroy(gameObject.GetComponent<WaveManager>());
        Destroy(gameObject.GetComponent(waveLogicScript.GetType()));
    }

    private void SpawnAllMapPrefabs(MapObject map)
    {
        GameObject prefab;
        foreach(var item in map.prefabs)
        {
            prefab = item.Key;
            GameObject go = Instantiate(prefab, item.Value.position, item.Value.rotation);
            currentMapObjects.Add(go);
            StaticBatchingUtility.Combine(prefab);
        }
    }

    private void DespawnAllMapPrefabs()
    {
        GameObject go;
        for (int i = 0; i < currentMapObjects.Count; i++)
        {
            go = currentMapObjects[i];
            Destroy(go);
        }
    }

    private MapObject FindCurrentMapInList()
    {
        return maps.Find(x => x.name == currentMapName);
    }

    /// <summary>
    /// Validate Map Objects data, should only be called when in editor mode
    /// </summary>
    /// <returns></returns>
    private void ValidateMapObjects()
    {
        foreach(MapObject map in maps)
        {
            if (map.prefabs.Count == 0)
                Debug.LogError("Map Object " + map.name + " does not contain any prefabs!");

            if (String.IsNullOrEmpty(map.waveLogicScriptName))
                Debug.LogError("Map Object " + map.name + " has an empty wave logic script name.");

            if (map.waveObjects.Count != Enum.GetNames(typeof(GameManager.Difficulty)).Length)
                Debug.LogError("Map Object " + map.name + " waveObjects do not reflect difficulty options.");
        }
    }
}