package letzplay.core;

import java.util.ArrayList;
import java.util.List;

public class GameEngine implements Trigger {
    private LevelSystem lvlSys;
    private List<Quest> quests;
    private List<String> state;


    private GameEngine() {
        lvlSys = LevelSystem.getInstance();
        quests = new ArrayList<>();
        state = new ArrayList<>();
    }

    public static GameEngine getInstance() {
        return new GameEngine();
    }

    public void initQuests(List<Quest> qs) {
        this.quests = qs;
    }

    private void finishQuest(Quest q) {
        if (q.progression().done == q.progression().of && !q.finished()) {
            q.setFinished();
            lvlSys.addExperience(q.getGainExp());
        }
    }

    public List<Quest> availableQuests() {
        List<Quest> result = new ArrayList<>();
        for (Quest q : quests
        ) {
            if (q.getMinLvl() <= lvlSys.currentLvl() && !q.finished()) {
                result.add(q);
            }
        }
        return result;
    }

    public List<Quest> doneQuests() {
        List<Quest> result = new ArrayList<>();
        for (Quest q : quests
        ) {
            if (q.finished()) {
                result.add(q);
            }
        }
        return result;
    }

    public int currentLvl() {
        return lvlSys.currentLvl();
    }

    public float currentExp() {
        return lvlSys.currentExperience();
    }


    public void update() {
        for (Quest q : quests
        ) {
            if (q.getMinLvl() <= lvlSys.currentLvl()) {
                finishQuest(q);
            }
        }
    }

    @Override
    public String toString() {
        return lvlSys.toString() + "\n " + quests.toString();
    }

    @Override
    public void trigger(String msg) {
        state.add(msg);
        for (Quest q : quests) {
            q.trigger(msg);
        }
    }

    public List<String> getState() {
        return state;
    }
}