package com.projectsacrifice.game;

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

/** Allocation-free critical-state comparison after a level has been configured. */
final class AccessibilityStateCache {
    private List<String> signalIds = Collections.emptyList();
    private GameLanguage language;
    private int activeSignals = Integer.MIN_VALUE;
    private int openDoors = Integer.MIN_VALUE;
    private int totalDoors = Integer.MIN_VALUE;
    private boolean playerAlive;
    private String statusText;

    void configureSignals(List<String> sourceIds) {
        ArrayList<String> unique = new ArrayList<>();
        for (String signalId : sourceIds) {
            if (!unique.contains(signalId)) unique.add(signalId);
        }
        signalIds = Collections.unmodifiableList(unique);
        language = null;
        activeSignals = Integer.MIN_VALUE;
        openDoors = Integer.MIN_VALUE;
        totalDoors = Integer.MIN_VALUE;
        statusText = null;
    }

    List<String> signalIds() {
        return signalIds;
    }

    boolean update(GameStrings strings, int updatedActiveSignals, int updatedOpenDoors,
                   int updatedTotalDoors, boolean updatedPlayerAlive) {
        GameLanguage updatedLanguage = strings.language();
        if (statusText != null
                && language == updatedLanguage
                && activeSignals == updatedActiveSignals
                && openDoors == updatedOpenDoors
                && totalDoors == updatedTotalDoors
                && playerAlive == updatedPlayerAlive) {
            return false;
        }
        language = updatedLanguage;
        activeSignals = updatedActiveSignals;
        openDoors = updatedOpenDoors;
        totalDoors = updatedTotalDoors;
        playerAlive = updatedPlayerAlive;
        statusText = AccessibilityStatus.describe(strings, activeSignals, signalIds.size(),
                openDoors, totalDoors, playerAlive);
        return true;
    }

    String statusText() {
        return statusText;
    }
}