Unity C# Questing Example Snippets

MeetQuest.cs

using System;
using Newtonsoft.Json;
using UnityEngine;

[Serializable]
public class MeetQuest : Quest
{
    [JsonProperty("meetPedestriansAmount")]
    public int meetPedestriansAmount;

    [JsonProperty("currentAmount")]
    public int currentAmount;

    public MeetQuest(string questName, string description, int meetPedestriansAmount)
    {
        // For superclass
        this.questName = questName;
        this.description = description;
        // Quest-specific
        this.meetPedestriansAmount = meetPedestriansAmount;
    }

    // Deserialization constructor
    [JsonConstructor]
    public MeetQuest() { }

    override public void Start()
    {
        GameEventManager.Instance.OnMetPedestrianHandler += OnMeetPedestrian;
        OnQuestStarted();
    }

    private void Complete()
    {
        GameEventManager.Instance.OnMetPedestrianHandler -= OnMeetPedestrian;
        OnQuestEnded();
    }

    private void OnMeetPedestrian(Pedestrian pedestrian)
    {
        currentAmount += 1;

        Debug.Log(DescriptionString() + ": met " + pedestrian.GetDialogue().name);
        Debug.Log(StatusString());
        if (currentAmount >= meetPedestriansAmount)
        {
            Complete();
        }
    }

    private string StatusString()
    {
        return "Quest '" + questName + "' progress " + currentAmount + "/" + meetPedestriansAmount;
    }
}

Quest.cs

using System;
using Newtonsoft.Json;

/**
 * Base quest class for more specific quest types
 * to extend.
 * Provides basic data fields & implementation for
 * broadcasting quest completion state.
 **/
public abstract class Quest
{
    public event Action<Quest> OnQuestStartedHandler;
    public event Action<Quest> OnQuestEndedHandler;

    /** 
     * [JsonProperty] annotations allow serializer/deserializer to load properties
     * with provided naming consistently, so that variable name refactoring could
     * be done without breaking anything.
     **/

    [JsonProperty("questName")]
    public string questName;

    [JsonProperty("description")]
    public string description;

    [JsonProperty("completed")]
    public bool completed;

    [JsonProperty("rewardClaimed")]
    public bool rewardClaimed;

    [JsonProperty("rewards")]
    public RewardData[] rewards;

    /**
     * Call this method to start tracking its progress
     **/
    public abstract void Start();

    /**
     * To be called by sub-classes when quest gets activated
     * (starts tracking its progress)
     **/
    protected void OnQuestStarted()
    {
        UnityEngine.Debug.Log(DescriptionString() + " started.");

        OnQuestStartedHandler?.Invoke(this);
    }

    /**
     * To be called by sub-classes when quest gets de-activated
     * (stops tracking its progress due to completion or failure)
     **/
    protected void OnQuestEnded()
    {
        UnityEngine.Debug.Log(DescriptionString() + " ended.");
        completed = true;

        OnQuestEndedHandler?.Invoke(this);
    }

    public string DescriptionString()
    {
        return "Quest '" + questName + "' (" + description + ")";
    }

}