using UnityEngine;
using System.Collections.Generic;
using System.Collections;
using UnityEngine.UI;
using System.Linq;
using ModTool;

/// <summary>
/// Example mod manager. This menu displays all mods and lets you enable/disable them.
/// </summary>
public class ModMenu : MonoBehaviour
{	
	/// <summary>
	/// The content panel where the menu items will be parented
	/// </summary>
	public Transform menuContentPanel;

	/// <summary>
	/// The prefab for the mod menu item
	/// </summary>
	public ModItem modItemPrefab;

	/// <summary>
	/// Button that will start loading enabled mods
	/// </summary>
	public Button loadButton;

	/// <summary>
	/// Dictionary linking mod menu items with mods
	/// </summary>
	private Dictionary<Mod, ModItem> modItems;

	/// <summary>
	/// Are the enabled mods loaded?
	/// </summary>
	private bool isLoaded;
		
	void Start()
	{
		ModManager.AddSearchDirectory(System.Environment.GetFolderPath(System.Environment.SpecialFolder.MyDocuments)+@"\My Games\Firstborn\Mods");
		modItems = new Dictionary<Mod, ModItem>();

		//Subscribe to ModManager events for keeping track of found mods
		ModManager.ModFound += OnModFound;
		ModManager.ModRemoved += OnModRemoved;

		//Subscribe to ModManager events to keep track of loaded mods
		ModManager.ModLoaded += OnModLoaded;
		ModManager.ModUnloaded += OnModUnloaded;
		
		//Refresh and look mods in mod search directories
		ModManager.Refresh();

		//Start refreshing ModManager to look for changes every 2 seconds
		StartCoroutine(AutoRefresh(2));

		Application.runInBackground = true;		
	}
   
	private void OnModFound(Mod mod)
	{
		ModItem modItem = Instantiate(modItemPrefab, menuContentPanel);
		modItem.Initialize(mod);
		modItem.SetToggleInteractable(!isLoaded);
		modItems.Add(mod, modItem);
	}

	private void OnModRemoved(Mod mod)
	{
		ModItem modItem;

		if(modItems.TryGetValue(mod, out modItem))
		{
			modItems.Remove(mod);
			Destroy(modItem.gameObject);
		}
	}
		
	private void SetTogglesInteractable(bool interactable)
	{
		foreach (ModItem item in modItems.Values)
		{
			item.SetToggleInteractable(interactable);
		}
	}

	/// <summary>
	/// Toggle load or unload all enabled mods.
	/// </summary>
	public void LoadButton()
	{
		if (isLoaded)
		{
			Unload();
		}
		else
		{
			Load();
		}
	}

	IEnumerator AutoRefresh(float seconds)
	{
		while(true)
		{
			ModManager.Refresh();
			yield return new WaitForSeconds(seconds);
		}
	}

	private void Load()
	{
		//load mods
		foreach (Mod mod in modItems.Keys)
		{
			if(mod.isEnabled)
				mod.Load();
		}

		SetTogglesInteractable(false);

		loadButton.GetComponentInChildren<Text>().text = "U N L O A D";

		isLoaded = true;
	}

	private void Unload()
	{   
		//unload all mods - this will unload their scenes and destroy any associated objects
		foreach (Mod mod in modItems.Keys)
		{
			mod.Unload();
		}

		SetTogglesInteractable(true);

		loadButton.GetComponentInChildren<Text>().text = "L O A D";

		isLoaded = false;
	}
	
	private void OnModLoaded(Mod mod)
	{
		Debug.Log("Loaded Mod: " + mod.name);

		//load first scene (if present) when a mod is loaded
		ModScene scene = mod.scenes.FirstOrDefault();

		if (scene != null)
			scene.Load();	   
	}

	private void OnModUnloaded(Mod mod)
	{
		Debug.Log("Unloaded Mod: " + mod.name);
	}
}