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

namespace Fungus
{
	[CommandInfo("Dialog", 
	             "Choose", 
	             "Presents a list of options for the player to choose from using a Choose Dialog. " + 
	             "Place Add Option commands before the Choose command to specify the player options. " + 
	             "You can also set a timeout which will cause the following command to execute when the timer runs out.")]
	public class Choose : Command 
	{
		public class Option
		{
			public string optionText;
			public Sequence targetSequence;
			public Action action;
		}

		static public List<Option> options = new List<Option>();

		[Tooltip("Story text to display to prompt player to choose an option")]
		[TextArea(5,10)]
		public string chooseText;

		[Tooltip("Speaking character to use when prompting the player to choose an option")]
		public Character character;

		[Tooltip("Choose Dialog object to use to display the player options")]
		public ChooseDialog chooseDialog;

		[Tooltip("Voiceover audio to play when prompting the player to choose an option")]
		public AudioClip voiceOverClip;

		[Tooltip("Time limit for player to choose an option. Set to 0 for no time limit.")]
		public float timeoutDuration;

		protected bool showBasicGUI;

		public override void OnEnter()
		{
			showBasicGUI = false;
			if (chooseDialog == null)
			{
				if ( character != null ) {
					// Try to get character's choose box
					chooseDialog = character.chooseDialogBox;
				}
				
				if (chooseDialog == null)
				{
					// Try to get any SayDialog in the scene
					chooseDialog = GameObject.FindObjectOfType<ChooseDialog>();
				}
	
				if (chooseDialog == null)
				{
					showBasicGUI = true;
					return;
				}
			}

			if (options.Count == 0)
			{
				Continue();
			}
			else
			{
				FungusScript fungusScript = GetFungusScript();

				chooseDialog.ShowDialog(true);
				chooseDialog.SetCharacter(character, fungusScript);

				List<ChooseDialog.Option> dialogOptions = new List<ChooseDialog.Option>();
				foreach (Option option in options)
				{
					ChooseDialog.Option dialogOption = new ChooseDialog.Option();

					// Store these in local variables so they get closed over correctly by the delegate call
					dialogOption.text = option.optionText;
					dialogOption.text = fungusScript.SubstituteVariables(dialogOption.text);
					Sequence onSelectSequence = option.targetSequence;
					Action optionAction = option.action;

					dialogOption.onSelect = delegate {

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

						chooseDialog.ShowDialog(false);

						if (onSelectSequence == null)
						{
							Continue ();
						}
						else
						{
							ExecuteSequence(onSelectSequence);
						}
					};

					dialogOptions.Add(dialogOption);
				}
			
				options.Clear();

				if (voiceOverClip != null)
				{
					chooseDialog.PlayVoiceOver(voiceOverClip);
				}

				string subbedText = fungusScript.SubstituteVariables(chooseText);

				chooseDialog.Choose(subbedText, dialogOptions, timeoutDuration, delegate {
					chooseDialog.ShowDialog(false);
					Continue();
				});
			}
		}

		public override string GetSummary()
		{
			return "\"" + chooseText + "\"";
		}

		public override void GetConnectedSequences (ref List<Sequence> connectedSequences)
		{
			// Show connected sequences from preceding AddOption commands
			if (IsExecuting())
			{
				foreach (Option option in options)
				{
					if (option.targetSequence != null)
					{
						connectedSequences.Add(option.targetSequence);
					}
				}
			}
		}

		protected virtual void OnGUI()
		{
			if (!showBasicGUI)
			{
				return;
			}
			
			// Draw a basic GUI to use when no uGUI dialog has been set
			// Does not support drawing character images
			
			GUILayout.BeginHorizontal(GUILayout.Width(Screen.width));
			GUILayout.FlexibleSpace();
			
			GUILayout.BeginVertical(GUILayout.Height(Screen.height));
			GUILayout.FlexibleSpace();
			
			GUILayout.BeginVertical(new GUIStyle(GUI.skin.box));

			if (character != null)
			{
				GUILayout.Label(character.nameText);
				GUILayout.Space(10);
			}

			GUILayout.Label(chooseText);

			foreach (Option option in options)
			{
				if (GUILayout.Button(option.optionText))
				{
					options.Clear();
					showBasicGUI = false;
					ExecuteSequence(option.targetSequence);
				}
			}

			GUILayout.EndVertical();
			
			GUILayout.FlexibleSpace();
			GUILayout.EndVertical();
			
			GUILayout.FlexibleSpace();
			GUILayout.EndHorizontal();
		}

		public override Color GetButtonColor()
		{
			return new Color32(184, 210, 235, 255);
		}
	}

}