Adjust DialogueManager.cs to support branching

UOP1_Project/Assets/Scripts/Dialogues/DialogueManager.cs

-using System.Collections;
+using System;
+using TMPro;
+using UnityEngine.UI;
 
 /// <summary>
 /// Takes care of all things dialogue, whether they are coming from within a Timeline or just from the interaction with a character, or by any other mean.
-{
+{ 
+	[SerializeField] private ChoiceBox _choiceBox; // TODO: Remove. // Demonstration purpose only. Delete later. 
+
-	/// <summary>
-	/// Called to begin a dialogue, i.e. a sequence of lines that require the player's input to move forward.
-	/// </summary>
-	/// <param name="firstLine"></param>
-	public void BeginDialogue(DialogueLineSO firstLine)
+	private DialogueDataSO _currentDialogueDataSO;
+	private int _counter;
+	private bool _reachedEndOfDialogue { get => _counter >= _currentDialogueDataSO.dialogueLines.Count; }
+
+	private void OnAdvance()
+	{ 
+		_counter++;
+
+		if (!_reachedEndOfDialogue)
+		{
+			DisplayDialogueLine(_currentDialogueDataSO.dialogueLines[_counter]);
+		}
+		else
+		{
+			if(_currentDialogueDataSO.Choices.Count > 0)
+			{
+				DisplayChoices(_currentDialogueDataSO.Choices);
+			}
+			else
+			{
+				DialogueEnded();
+			}
+		}
+	}
+
+	public void DialogueEnded()
+	{
+		// TODO: Disable dialogue box.
+		Debug.Log("Dialogue Ended");
+		_inputReader.advanceDialogueEvent -= OnAdvance;
+		_inputReader.EnableGameplayInput();
+	}
+
+	private void DisplayChoices(List<Choice> choices)
+	{ 
+		_inputReader.advanceDialogueEvent -= OnAdvance;
+
+		// Demonstration purpose only. Delete later.
+		_choiceBox.Show(_currentDialogueDataSO.Choices, this);
+	}
+
+	public void DisplayDialogueData(DialogueDataSO dialogueDataSO)
+	{
+		BeginDialogueData(dialogueDataSO);
+
+		DisplayDialogueLine(_currentDialogueDataSO.dialogueLines[_counter]); 
+	} 
+
+	private void BeginDialogueData(DialogueDataSO dialogueDataSO)
+		_counter = 0;
-
-		DisplayDialogueLine(firstLine);
+		_inputReader.advanceDialogueEvent += OnAdvance;
+		_currentDialogueDataSO = dialogueDataSO;
 	}
 
 	/// <summary>
 		Debug.Log("A line of dialogue has been spoken: \"" + dialogueLine.Sentence + "\" by " + dialogueLine.Actor.ActorName);
 	}
 }
+
+// Demonstration purpose only. Delete later.
+// TODO: Remove.
+[Serializable]
+public class ChoiceBox	
+{
+	[SerializeField] private GameObject _gameObject;
+	[SerializeField] private Transform _contentTrans;
+	[SerializeField] private GameObject _buttonPrefab;
+
+	public void Show(List<Choice> choices, DialogueManager dialogueManager)
+	{
+		_gameObject.SetActive(true);
+
+		// Refresh choice box
+		foreach(Transform child in _contentTrans)
+		{
+			GameObject.Destroy(child.gameObject);
+		}
+
+		for(int i = 0; i < choices.Count; i++)
+		{
+			Button choiceButton = GameObject.Instantiate<Button>(_buttonPrefab.GetComponent<Button>(), _contentTrans);
+			choiceButton.GetComponentInChildren<TMP_Text>().text = choices[i].OptionName;
+
+			int index = i;
+			choiceButton.onClick.AddListener(() => OnChoiceButtonClick(choices[index], dialogueManager)); 
+		}
+	}
+
+	private void OnChoiceButtonClick(Choice choice, DialogueManager dialogueManager)
+	{
+		if (choice.Response != null)
+			dialogueManager.DisplayDialogueData(choice.Response);
+		else
+			dialogueManager.DialogueEnded();
+
+		_gameObject.SetActive(false);
+	}
+}