pgs/Assets/Scripts/GameData/NpcBehavior.cs

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

public class NpcInteraction {
    public DialogueID dialogueID;
    public bool showShop;

    public NpcInteraction(DialogueID dialogueID,
        bool showAvailableQuests = false,
        bool showShop = false) {
        this.dialogueID = dialogueID;
        this.showShop = showShop;
    }
}

public abstract class NpcBehavior {
    public NpcID npcID;
    public abstract NpcInteraction Interact();
    public abstract NpcInteraction QuestInteract(QuestID questID);
    public abstract NpcInteraction QuestInteractAll();
    public abstract NpcInteraction Cancel(); // Closing out from the Availble Quests window.

    public Hashtable questAcceptDialogueMap; // Hashtable<QuestID, DialogueID>
    public Hashtable questCompleteDialogueMap; // Hashtable<QuestID, DialogueID>
    public DialogueID showQuestsDialogueID;
    public DialogueID cancelDialogueID;
    public DialogueID defaultDialogueID;
}

public class NpcBehavior_Generic : NpcBehavior {
    public NpcBehavior_Generic(Hashtable questAcceptDialogueMap, Hashtable questCompleteDialogueMap, DialogueID showQuestsDialogueID, DialogueID cancelDialogueID, DialogueID defaultDialogueID) {
        this.questAcceptDialogueMap = questAcceptDialogueMap;
        this.questCompleteDialogueMap = questCompleteDialogueMap;
        this.showQuestsDialogueID = showQuestsDialogueID;
        this.cancelDialogueID = cancelDialogueID;
        this.defaultDialogueID = defaultDialogueID;
    }

    public override NpcInteraction Interact() {
        return new NpcInteraction(defaultDialogueID);
    }

    public override NpcInteraction QuestInteract(QuestID questID) {
        State.state.quests.RefreshAvailableQuests();

        // If accepting the quest works, yield the quest acceptance dialogue for that quest.
        if (((NpcQuestProgress)State.state.npcState.npcQuestMap[npcID]).acceptingQuests.Contains(questID) &&
            ((Npc)NpcInfo.npcs[npcID]).AcceptQuest(questID)) {
            return new NpcInteraction((DialogueID)questAcceptDialogueMap[questID]);
        }
        // If completing the quest works, yield the quest completion dialogue for that quest.
        if (((NpcQuestProgress)State.state.npcState.npcQuestMap[npcID]).inProgressQuests.Contains(questID) &&
            ((Npc)NpcInfo.npcs[npcID]).CompleteQuest(questID)) {
            return new NpcInteraction((DialogueID)questCompleteDialogueMap[questID]);
        }

        return new NpcInteraction(defaultDialogueID);
    }

    public override NpcInteraction QuestInteractAll() {
        State.state.quests.RefreshAvailableQuests();

        // Check completable quests
        HashSet<QuestID> inProgressQuests =
            ((NpcQuestProgress)State.state.npcState.npcQuestMap[npcID]).inProgressQuests;
        foreach (QuestID questID in inProgressQuests) {
            // If completing the quest works, yield the quest completion dialogue for that quest.
            if (((Npc)NpcInfo.npcs[npcID]).CompleteQuest(questID)) {
                return new NpcInteraction((DialogueID)questCompleteDialogueMap[questID]);
            }
        }

        // If quests are available, show available quests
        HashSet<QuestID> acceptingQuests =
            ((NpcQuestProgress)State.state.npcState.npcQuestMap[npcID]).acceptingQuests;
        foreach (QuestID questID in acceptingQuests) {
            // If accepting the quest works, yield the quest acceptance dialogue for that quest.
            if (((Npc)NpcInfo.npcs[npcID]).AcceptQuest(questID)) {
                return new NpcInteraction((DialogueID)questAcceptDialogueMap[questID]);
            }
        }

        return new NpcInteraction(defaultDialogueID);
    }

    public override NpcInteraction Cancel() {
        return new NpcInteraction(cancelDialogueID);
    }
}