using UnityEngine;
using System.Collections;

using UMod;
using System;

namespace UMod.Example
{
    /// <summary>
    /// An example script that shows how to load a prefab from a mod asynchronously.
    /// To use this script simply attach it to a game object and ensure that the path variable points to a valid mod, and that the asset variable is a valid prefab in the mod.
    /// It is important that the mod has been successfully loaded before attempting to load assets otherwise an exception will be thrown.
    /// </summary>
    public class Ex14_LoadModAssetsAsync : MonoBehaviour
    {
        // The host used by this class
        private ModHost host = null;

        // The path to the mod
        public string modPath = "C:/Mods/Test Mod";

        // The asset to load from the mod
        public string assetName = "Test Prefab";


        private IEnumerator Start()
        {
            // Load the mod as in previous examples
            host = Mod.Load(new Uri(modPath));

            // We need to make sure the mod is loaded before attempting to load assets
            if (host.IsModLoaded == true)
            {
                // We are now ready to issue a load request for an asset
                // First we will make sure that there is an asset with the specified name
                if (host.Assets.Exists(assetName) == true)
                {
                    // Create a load request
                    ModAsyncOperation request = host.Assets.LoadAsync(assetName);

                    // Wait for completion
                    yield return request;

                    // Get the load result
                    GameObject go = request.Result as GameObject;

                    // Just like 'Resources' we can also use the generic method:
                    // host.Assets.LoadAsync<GameObject>(assetName);

                    // Make sure nothing went wrong
                    // The only thing that can fail at this point is the cast to GameObject if the asset is of a different type
                    if (go != null)
                    {
                        // Create an instance of this prefab
                        Instantiate(go, Vector3.zero, Quaternion.identity);
                    }
                }
                else
                {
                    // There is no asset with the specified name
                    ExampleUtil.LogError(this, "An asset called '" + assetName + "' does not exist in the mod");
                }
            }
            else
            {
                // We cannot continue with asset loading
                ExampleUtil.LogError(this, "Failed to load the mod");
            }
        }
    }
}