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Classic point and click adventure game engine
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package com.bladecoder.engine.ink;

import java.util.ArrayList;

import com.badlogic.gdx.utils.Json;
import com.badlogic.gdx.utils.Json.Serializable;
import com.badlogic.gdx.utils.JsonValue;
import com.bladecoder.engine.actions.Action;
import com.bladecoder.engine.actions.ActionCallback;
import com.bladecoder.engine.model.VerbRunner;
import com.bladecoder.engine.model.World;
import com.bladecoder.engine.serialization.ActionCallbackSerializer;
import com.bladecoder.engine.serialization.BladeJson;
import com.bladecoder.engine.util.ActionUtils;
import com.bladecoder.engine.util.EngineLogger;

/**
 * This VerbRunner instead of increment the IP, it executes the current action
 * and deletes it from the action list.
 * 
 * It only maintains the executed action in the action list if it is of
 * ActionCallback type because ActionCallback actions can be called back and
 * could be lost after save/load.
 * 
 * Backward compatibility note: This class can load and execute old savegames
 * were not multiflow was implemented.
 * 
 * @author rgarcia
 */
public class InkVerbRunner implements VerbRunner, Serializable {
	private final ArrayList actions = new ArrayList<>(1);
	private int ip = 0;
	private boolean cancelled = false;
	private String flow;
	private ActionCallback cb;

	// Depending on the reading order of Inventory, InkManager and Actor verbs,
	// the verbCallbacks may not exist. So, we search the Cb lazily when needed.
	private String sCb;

	private final InkManager inkManager;
	private final World w;

	public InkVerbRunner(World w, InkManager inkManager, String flow, ActionCallback cb, String sCb) {
		this.flow = flow;
		this.cb = cb;
		this.sCb = sCb;
		this.inkManager = inkManager;
		this.w = w;
	}

	public String getFlow() {
		return flow;
	}

	public boolean isFinish() {
		return actions.isEmpty() || ip >= actions.size() || cancelled;
	}

	@Override
	public void resume() {
		if (cancelled)
			return;

		// We store in the array only the ActionCallback actions
		// any other can be discarded after execution
		if (actions.get(ip) instanceof ActionCallback) {
			ip++;
		} else {
			actions.remove(ip);
		}

		nextStep();
	}

	@Override
	public ArrayList getActions() {
		return actions;
	}

	@Override
	public void run(String currentTarget, ActionCallback cb) {
		ip = 0;
		nextStep();
	}

	public void runCurrentAction() {
		nextStep();
	}

	@Override
	public int getIP() {
		return ip;
	}

	@Override
	public void setIP(int ip) {
		this.ip = ip;
	}

	@Override
	public void cancel() {
		cancelled = true;
		ip = actions.size();
		cb = null;
		sCb = null;
	}

	@Override
	public String getCurrentTarget() {
		return null;
	}

	public void callCb() {
		if (cb != null || sCb != null) {
			if (cb == null) {
				cb = ActionCallbackSerializer.find(w, w.getCurrentScene(), sCb);
			}

			ActionCallback tmpcb = cb;
			cb = null;
			sCb = null;
			tmpcb.resume();
		}
	}

	private void nextStep() {
		if (cancelled)
			return;

		try {
			inkManager.getStory().switchFlow(flow);
		} catch (Exception e1) {
			EngineLogger.error("InkManager: " + e1.getMessage());
			return;
		}

		boolean stop = false;

		while (ip < actions.size() && !stop && !cancelled) {
			Action a = actions.get(ip);

			try {
				if (a.run(this))
					stop = true;
				else {
					// We store in the array only the ActionCallback actions
					// any other can be discarded after execution
					if (a instanceof ActionCallback) {
						ip++;
					} else {
						actions.remove(ip);
					}
				}
			} catch (Exception e) {
				EngineLogger.error("EXCEPTION EXECUTING ACTION: InkManager - " + ip + " - "
						+ a.getClass().getSimpleName() + " - " + e.getMessage(), e);
				ip++;
			}
		}

		if (ip >= actions.size() && !stop)
			inkManager.continueMaximally(this);

	}

	@Override
	public void write(Json json) {
		BladeJson bjson = (BladeJson) json;
		World w = bjson.getWorld();

		if (cb == null && sCb != null)
			cb = ActionCallbackSerializer.find(w, w.getCurrentScene(), sCb);

		if (cb != null)
			json.writeValue("cb", ActionCallbackSerializer.serialize(w, w.getCurrentScene(), cb));

		// SAVE ACTIONS
		json.writeArrayStart("actions");
		for (Action a : getActions()) {
			ActionUtils.writeJson(a, json);
		}
		json.writeArrayEnd();

		json.writeValue("ip", getIP());

		json.writeArrayStart("actionsSer");
		for (Action a : getActions()) {
			if (a instanceof Serializable) {
				json.writeObjectStart();
				((Serializable) a).write(json);
				json.writeObjectEnd();
			}
		}
		json.writeArrayEnd();
	}

	@Override
	public void read(Json json, JsonValue jsonData) {
		BladeJson bjson = (BladeJson) json;
		World w = bjson.getWorld();

		sCb = json.readValue("cb", String.class, jsonData);

		// READ ACTIONS
		JsonValue actionsValue = jsonData.get("actions");

		for (int i = 0; i < actionsValue.size; i++) {
			JsonValue aValue = actionsValue.get(i);

			Action a = ActionUtils.readJson(w, json, aValue);
			getActions().add(a);
		}

		setIP(json.readValue("ip", Integer.class, jsonData));

		actionsValue = jsonData.get("actionsSer");

		int i = 0;

		for (Action a : getActions()) {
			if (a instanceof Serializable && i < actionsValue.size) {
				if (actionsValue.get(i) == null)
					break;

				((Serializable) a).read(json, actionsValue.get(i));
				i++;
			}
		}

	}
}