DougDiggem/Assets/Scripts/Dialogue/DialogueManager.cs

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

public class DialogueManager : MonoBehaviour
{
    private Queue<string> sentences;
    private Dialogue currentDialogue;

    public TextMeshProUGUI nameText;
    public TextMeshProUGUI dialogueText;

    public TextMeshProUGUI itemText; // displays name of nearby item
    public TextMeshProUGUI pickupHint; // tells the player to press 'E' to pickup

    public Animator animator;

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        sentences = new Queue<string>();
    }

    public void ReloadReferences()
    {
        nameText = GameObject.FindWithTag("DialogNameText").GetComponent<TextMeshProUGUI>();
        dialogueText = GameObject.FindWithTag("DialogMessageText").GetComponent<TextMeshProUGUI>();
        itemText = GameObject.FindWithTag("DialogItemText").GetComponent<TextMeshProUGUI>();
        pickupHint = GameObject.FindWithTag("ItemPickupText").GetComponent<TextMeshProUGUI>();
        animator = GameObject.FindWithTag("DialogContainer").GetComponent<Animator>();
    }

    public void StartDialogue(Dialogue dialogue)
    {
        animator.SetBool("IsOpen", true);

        sentences.Clear();
        currentDialogue = dialogue;
        nameText.text = dialogue.charName;

        foreach (string sentence in dialogue.sentences)
        {
            sentences.Enqueue(sentence);
        }

        currentDialogue.isActive = true;
        DisplayNextSentence();
    }

    public void DisplayNextSentence()
    {
        if (sentences.Count == 0)
        {
            EndDialogue();
            return;
        }

        string sentence = sentences.Dequeue();
        StopAllCoroutines();
        StartCoroutine(TypeSentence(sentence));
    }

    public void EndDialogue()
    {
        animator.SetBool("IsOpen", false);

        if (currentDialogue != null)
        {
            currentDialogue.isActive = false;
        }
    } 

    IEnumerator TypeSentence(string sentence)
    {
        dialogueText.text = "";
        foreach (char c in sentence.ToCharArray())
        {
            dialogueText.text += c;
            yield return new WaitForSeconds(0.01f);
        }
    }

    public void ShowItemText(string itemName)
    {
        itemText.text = itemName;
        pickupHint.text = "Press \"E\" to pick up";
    }

    public void HideItemText()
    {
        itemText.text = "";
        pickupHint.text = "";
    }
}