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

namespace Fungus
{
	/**
	 *  Command classes have their own namespace to prevent them popping up in code completion
	 */
	namespace Command
	{
		/** 
		 * Call a delegate method on execution.
		 * This command can be used to schedule arbitrary script code.
		 */
		public class CallCommand : CommandQueue.Command
		{
			Action callAction;

			public CallCommand(Action _callAction)
			{
				if (_callAction == null)
				{
					Debug.LogError("Action must not be null.");
					return;
				}

				callAction = _callAction;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				if (callAction != null)
				{
					callAction();
				}

				// Execute next command
				onComplete();
			}		
		}

		/**
		 * Wait for a period of time.
		 */
		public class WaitCommand : CommandQueue.Command
		{
			float duration;
			
			public WaitCommand(float _duration)
			{
				duration = _duration;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game.GetInstance().waiting = true;
				commandQueue.StartCoroutine(WaitCoroutine(duration, onComplete));
			}
			
			IEnumerator WaitCoroutine(float duration, Action onComplete)
			{
				yield return new WaitForSeconds(duration);
				if (onComplete != null)
				{
					Game.GetInstance().waiting = false;
					onComplete();
				}
			}
		}

		/**
		 * Wait for a player tap/click/key press
		 */
		public class WaitForInputCommand : CommandQueue.Command
		{
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game.GetInstance().waiting = true;
				commandQueue.StartCoroutine(WaitCoroutine(onComplete));
			}
			
			IEnumerator WaitCoroutine(Action onComplete)
			{
				while (true)
				{
					if (Input.GetMouseButtonDown(0) || Input.anyKeyDown)
					{
						break;
					}
					yield return null;
				}

				if (onComplete != null)
				{
					Game.GetInstance().waiting = false;
					onComplete();
				}
			}
		}

		/** 
		 * Sets the currently active view immediately.
		 * The main camera snaps to the active view.
		 */
		public class SetViewCommand : CommandQueue.Command
		{
			View view;
			
			public SetViewCommand(View _view)
			{
				if (_view == null)
				{
					Debug.LogError("View must not be null");
				}

				view = _view;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game game = Game.GetInstance();

				game.cameraController.SnapToView(view);
				game.activeView = view;

				// Set the first page component found (if any) as the active page
				Page page = view.gameObject.GetComponentInChildren<Page>();
				if (page != null)
				{
					Game.GetInstance().activePage = page;
				}

				if (onComplete != null)
				{
					onComplete();
				}
			}		
		}

		/**
		 * Sets the currently active page for text rendering.
		 */
		public class SetPageCommand : CommandQueue.Command
		{
			Page page;
			
			public SetPageCommand(Page _page)
			{
				page = _page;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game.GetInstance().activePage = page;
				if (onComplete != null)
				{
					onComplete();
				}
			}		
		}

		/**
		 * Sets the currently active Page Style for rendering Pages.
		 */
		public class SetPageStyleCommand : CommandQueue.Command
		{
			PageStyle pageStyle;
			
			public SetPageStyleCommand(PageStyle _pageStyle)
			{
				pageStyle = _pageStyle;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game.GetInstance().activePageStyle = pageStyle;
				if (onComplete != null)
				{
					onComplete();
				}
			}		
		}
		
		/**
		 * Sets the title text displayed at the top of the active page.
		 */
		public class TitleCommand : CommandQueue.Command
		{
			string titleText;
			
			public TitleCommand(string _titleText)
			{
				titleText = _titleText;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Page page = Game.GetInstance().activePage;
				if (page == null)
				{
					Debug.LogError("Active page must not be null");
				}
				else
				{
					page.SetTitle(titleText);
				}
				if (onComplete != null)
				{
					onComplete();
				}
			}		
		}

		/** 
		 * Writes story text to the currently active page.
		 * A 'continue' button is displayed when the text has fully appeared.
		 */
		public class SayCommand : CommandQueue.Command
		{
			string storyText;
			
			public SayCommand(string _storyText)
			{
				storyText = _storyText;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Page page = Game.GetInstance().activePage;
				if (page == null)
				{
					Debug.LogError("Active page must not be null");
				}
				else
				{
					page.Say(storyText, onComplete);
				}
			}
		}

		/** 
		 * Adds an option button to the current list of options.
		 * Use the Choose command to display added options.
		 */
		public class AddOptionCommand : CommandQueue.Command
		{
			string optionText;
			Action optionAction;
			
			public AddOptionCommand(string _optionText, Action _optionAction)
			{
				optionText = _optionText;
				optionAction = _optionAction;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Page page = Game.GetInstance().activePage;
				if (page == null)
				{
					Debug.LogError("Active page must not be null");
				}
				else
				{
					page.AddOption(optionText, optionAction);
				}
				if (onComplete != null)
				{
					onComplete();
				}
			}		
		}

		/**
		 * Displays all previously added options.
		 */
		public class ChooseCommand : CommandQueue.Command
		{
			string chooseText;

			public ChooseCommand(string _chooseText)
			{
				chooseText = _chooseText;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Page page = Game.GetInstance().activePage;
				if (page == null)
				{
					Debug.LogError("Active page must not be null");
				}
				else
				{
					page.Choose(chooseText);
				}
				// Choose always clears commandQueue, so no need to call onComplete()
			}		
		}

		/** 
		 * Changes the active room to a different room
		 */
		public class MoveToRoomCommand : CommandQueue.Command
		{
			Room room;

			public MoveToRoomCommand(Room _room)
			{
				if (_room == null)
				{
					Debug.LogError("Room must not be null.");
					return;
				}

				room = _room;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game.GetInstance().MoveToRoom(room);

				// MoveToRoom always resets the command queue so no need to call onComplete
			}
		}

		/** 
		 * Sets a globally accessible game value
		 */
		public class SetValueCommand : CommandQueue.Command
		{
			string key;
			int value;

			public SetValueCommand(string _key, int _value)
			{
				key = _key;
				value = _value;
			}

			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game.GetInstance().SetValue(key, value);
				if (onComplete != null)
				{
					onComplete();
				}
			}		
		}

		/** 
		 * Fades a sprite to a given alpha value over a period of time
		 */
		public class FadeSpriteCommand : CommandQueue.Command
		{
			SpriteRenderer spriteRenderer;
			Color targetColor;
			float fadeDuration;
			Vector2 slideOffset = Vector2.zero;
			
			public FadeSpriteCommand(SpriteRenderer _spriteRenderer,
			                         Color _targetColor,
			                         float _fadeDuration,
			                         Vector2 _slideOffset)
			{
				if (_spriteRenderer == null)
				{
					Debug.LogError("Sprite renderer must not be null.");
					return;
				}

				spriteRenderer = _spriteRenderer;
				targetColor = _targetColor;
				fadeDuration = _fadeDuration;
				slideOffset = _slideOffset;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				SpriteFader.FadeSprite(spriteRenderer, targetColor, fadeDuration, slideOffset);

				// Fade is asynchronous, but command completes immediately.
				// If you need to wait for the fade to complete, just use an additional Wait() command
				if (onComplete != null)
				{
					onComplete();
				}
			}		
		}

		/** 
		 * Sets an animator trigger to change the animator state for an animated sprite
		 */
		public class SetAnimatorTriggerCommand : CommandQueue.Command
		{
			Animator animator;
			string triggerName;

			public SetAnimatorTriggerCommand(Animator _animator,
			                                 string _triggerName)
			{
				if (_animator == null)
				{
					Debug.LogError("Animator must not be null.");
					return;
				}

				animator = _animator;
				triggerName = _triggerName;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				animator.SetTrigger(triggerName);

				if (onComplete != null)
				{
					onComplete();
				}
			}		
		}

		/** 
		 * Display a button and set the method to be called when player clicks.
		 */
		public class ShowButtonCommand : CommandQueue.Command
		{
			Button button;
			bool visible;
			Action buttonAction;

			public ShowButtonCommand(Button _button,
			                         bool _visible,
			                         Action _buttonAction)
			{
				if (_button == null)
				{
					Debug.LogError("Button must not be null.");
					return;
				}
				
				button = _button;
				visible = _visible;
				buttonAction = _buttonAction;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				button.Show(visible, buttonAction);
				
				if (onComplete != null)
				{
					onComplete();
				}
			}		
		}

		/** 
		 * Pans the camera to a view over a period of time.
		 */
		public class PanToViewCommand : CommandQueue.Command
		{
			View view;
			float duration;

			public PanToViewCommand(View _view,
			                        float _duration)
			{
				if (_view == null)
				{
					Debug.LogError("View must not be null.");
					return;
				}

				view = _view;
				duration = _duration;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game game = Game.GetInstance();

				game.cameraController.PanToView(view, duration, delegate {

					game.activeView = view;

					// Try to find a page that is a child of the active view.
					// If there are multiple child pages then it is the client's responsibility 
					// to set the correct active page in the room script.
					Page defaultPage = view.gameObject.GetComponentInChildren<Page>();
					if (defaultPage)
					{
						game.activePage = defaultPage;
					}

					if (onComplete != null)
					{
						onComplete();
					}
				});
			}		
		}

		/** 
		 * Pans the camera through a sequence of views over a period of time.
		 */
		public class PanToPathCommand : CommandQueue.Command
		{
			View[] views;
			float duration;
			
			public PanToPathCommand(View[] _views,
			                        	float _duration)
			{
				if (_views.Length == 0)
				{
					Debug.LogError("View list must not be empty.");
					return;
				}
				
				views = _views;
				duration = _duration;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game game = Game.GetInstance();

				game.cameraController.PanToPath(views, duration, delegate {

					if (views.Length > 0)
					{
						game.activeView = views[views.Length - 1];
						
						// Try to find a page that is a child of the active view.
						// If there are multiple child pages then it is the client's responsibility 
						// to set the correct active page in the room script.
						Page defaultPage = game.activeView.gameObject.GetComponentInChildren<Page>();
						if (defaultPage)
						{
							game.activePage = defaultPage;
						}
					}
					
					if (onComplete != null)
					{
						onComplete();
					}
				});
			}		
		}

		/** 
		 * Fades the camera to a view over a period of time.
		 */
		public class FadeToViewCommand : CommandQueue.Command
		{
			View view;
			float duration;

			public FadeToViewCommand(View _view,
			                         float _duration)
			{
				if (_view == null)
				{
					Debug.LogError("View must not be null.");
					return;
				}

				view = _view;
				duration = _duration;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game game = Game.GetInstance();

				game.cameraController.FadeToView(view, duration, delegate {

					game.activeView = view;
					
					// Try to find a page that is a child of the active view.
					// If there are multiple child pages then it is the client's responsibility 
					// to set the correct active page in the room script.
					Page defaultPage = view.gameObject.GetComponentInChildren<Page>();
					if (defaultPage)
					{
						game.activePage = defaultPage;
					}

					if (onComplete != null)
					{
						onComplete();
					}
				});
			}		
		}

		/** 
		 * Plays a music clip
		 */
		public class PlayMusicCommand : CommandQueue.Command
		{
			AudioClip audioClip;

			public PlayMusicCommand(AudioClip _audioClip)
			{
				if (_audioClip == null)
				{
					Debug.LogError("Audio clip must not be null.");
					return;
				}
				
				audioClip = _audioClip;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game game = Game.GetInstance();

				game.audio.clip = audioClip;
				game.audio.Play();

				if (onComplete != null)
				{
					onComplete();
				}
			}
		}

		/** 
		 * Stops a music clip
		 */
		public class StopMusicCommand : CommandQueue.Command
		{
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game game = Game.GetInstance();
				game.audio.Stop();

				if (onComplete != null)
				{
					onComplete();
				}
			}
		}

		/** 
		 * Fades music volume to required level over a period of time
		 */
		public class SetMusicVolumeCommand : CommandQueue.Command
		{
			float musicVolume;
			float duration;
			
			public SetMusicVolumeCommand(float _musicVolume, float _duration)
			{
				musicVolume = _musicVolume;
				duration = _duration;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game game = Game.GetInstance();
				iTween.AudioTo(game.gameObject, musicVolume, 1f, duration);

				if (onComplete != null)
				{
					onComplete();
				}
			}
		}

		/** 
		 * Plays a sound effect once
		 */
		public class PlaySoundCommand : CommandQueue.Command
		{
			AudioClip audioClip;
			float volume;
			
			public PlaySoundCommand(AudioClip _audioClip, float _volume)
			{
				audioClip = _audioClip;
				volume = _volume;
			}
			
			public override void Execute(CommandQueue commandQueue, Action onComplete)
			{
				Game game = Game.GetInstance();
				game.audio.PlayOneShot(audioClip, volume);

				if (onComplete != null)
				{
					onComplete();
				}
			}
		}
	}
}