// Copyright (c) Pixel Crushers. All rights reserved.

using UnityEngine;

namespace PixelCrushers.DialogueSystem.SequencerCommands
{

    /// <summary>
    /// This script implements the sequencer command LoadLevel(levelName, [spawnpoint], [additive]).
    /// It tries, in order:
    /// - SaveSystem (to handle scene transitions and persistent data), or
    /// - LevelManager (to handle persistent data), or
    /// - manually calls PersistentDataManager.Record() to
    /// tell objects in the current level to record their persistent data first,
    /// and then it calls LevelWillBeUnloaded() to tell the objects to ignore
    /// the upcoming OnDestroy() if they have OnDestroy() handlers.
    /// 
    /// If a second parameter is included, it uses it as the player's spawnpoint in the new level.
    /// 
    /// If a third parameter named 'additive' is included, it loads the scene additively and does not
    /// use a spawnpoint.
    /// </summary>
    [AddComponentMenu("")] // Hide from menu.
    public class SequencerCommandLoadLevel : SequencerCommand
    {

        public void Start()
        {
            string levelName = GetParameter(0);
            string spawnpoint = GetParameter(1);
            bool additive = string.Equals(GetParameter(2), "additive", System.StringComparison.OrdinalIgnoreCase);
            if (string.IsNullOrEmpty(levelName))
            {
                if (DialogueDebug.logWarnings) Debug.LogWarning(string.Format("{0}: Sequencer: LoadLevel() level name is an empty string", DialogueDebug.Prefix));
            }
            else
            {
                if (DialogueDebug.logInfo) Debug.Log(string.Format("{0}: Sequencer: LoadLevel({1})", DialogueDebug.Prefix, GetParameters()));
                DialogueLua.SetActorField("Player", "Spawnpoint", spawnpoint);
                if (SaveSystem.hasInstance)
                {
                    if (additive)
                    {
                        SaveSystem.LoadAdditiveScene(levelName);
                    }
                    else
                    {
                        PersistentDataManager.LevelWillBeUnloaded();
                        SaveSystem.LoadScene(string.IsNullOrEmpty(spawnpoint) ? levelName : levelName + "@" + spawnpoint);
                    }

                }
                else
                {
                    if (additive)
                    {
                        UnityEngine.SceneManagement.SceneManager.LoadScene(levelName, UnityEngine.SceneManagement.LoadSceneMode.Additive);
                    }
                    else
                    {
                        var levelManager = PixelCrushers.GameObjectUtility.FindFirstObjectByType<LevelManager>();
                        if (levelManager != null)
                        {
                            levelManager.LoadLevel(levelName);
                        }
                        else
                        {
                            PersistentDataManager.Record();
                            PersistentDataManager.LevelWillBeUnloaded();
                            UnityEngine.SceneManagement.SceneManager.LoadScene(levelName, UnityEngine.SceneManagement.LoadSceneMode.Single);
                            PersistentDataManager.Apply();
                        }
                    }
                }
            }
            Stop();
        }
    }
}