const SDK_URL = 'https://html5.api.gamedistribution.com/main.min.js';

function loadScript(src) {
    return new Promise((resolve, reject) => {
        const script = document.createElement('script');
        script.src = src;
        script.onload = resolve;
        script.onerror = reject;
        document.head.appendChild(script);
    });
}

const options = {
    gameId: 'YOUR_GAME_ID'
};

let platformSdk = null;
let isInitialized = false;
let currentAdvertisementIsRewarded = false;

const listeners = {
    interstitialStateChanged: [],
    rewardedStateChanged: [],
    bannerStateChanged: [],
    pauseStateChanged: [],
    audioStateChanged: []
};

function emit(name, payload) {
    listeners[name].forEach((cb) => cb(payload));
}

function initialize() {
    return new Promise((resolve, reject) => {
        if (isInitialized) {
            resolve();
            return;
        }

        if (typeof options.gameId !== 'string') {
            reject(new Error('Game params are not found'));
            return;
        }

        window.GD_OPTIONS = {
            gameId: options.gameId,
            onEvent(event) {
                switch (event.name) {
                    case 'SDK_READY':
                        platformSdk = window.gdsdk;
                        isInitialized = true;

                        // Optional: show an interstitial immediately once the SDK is ready
                        showInterstitial();
                        resolve();
                        break;
                    case 'SDK_GAME_START':
                        // Ad finished — game should resume
                        if (currentAdvertisementIsRewarded) {
                            emit('rewardedStateChanged', 'closed');
                            // Preload the next rewarded ad right away
                            platformSdk.preloadAd('rewarded');
                        } else {
                            emit('interstitialStateChanged', 'closed');
                        }
                        emit('pauseStateChanged', false);
                        emit('audioStateChanged', true);
                        break;
                    case 'SDK_GAME_PAUSE':
                        // Ad started — game should pause
                        if (currentAdvertisementIsRewarded) {
                            emit('rewardedStateChanged', 'opened');
                        } else {
                            emit('interstitialStateChanged', 'opened');
                        }
                        emit('pauseStateChanged', true);
                        emit('audioStateChanged', false);
                        break;
                    case 'SDK_REWARDED_WATCH_COMPLETE':
                        // Reward must be granted here
                        emit('rewardedStateChanged', 'rewarded');
                        break;
                    case 'SDK_GDPR_TRACKING':
                    case 'SDK_GDPR_TARGETING':
                    default:
                        break;
                }
            }
        };

        loadScript(SDK_URL).catch(reject);
    });
}

function showInterstitial() {
    currentAdvertisementIsRewarded = false;

    if (!platformSdk) {
        emit('interstitialStateChanged', 'failed');
        return;
    }

    platformSdk.showAd().catch(() => {
        emit('interstitialStateChanged', 'failed');
    });
}

function preloadRewarded() {
    if (platformSdk) {
        platformSdk.preloadAd('rewarded');
    }
}

function showRewarded() {
    currentAdvertisementIsRewarded = true;

    if (!platformSdk) {
        emit('rewardedStateChanged', 'failed');
        return;
    }

    platformSdk.showAd('rewarded').catch(() => {
        emit('rewardedStateChanged', 'failed');
    });
}

const BANNER_CONTAINER_ID = 'banner-container';

function createBannerContainer(position) {
    const container = document.createElement('div');
    container.id = BANNER_CONTAINER_ID;
    container.style.position = 'fixed';
    container.style.left = '0';
    container.style.right = '0';
    container.style.zIndex = '9999';

    if (position === 'top') {
        container.style.top = '0';
    } else {
        container.style.bottom = '0';
    }

    document.body.appendChild(container);
    return container;
}

function showBanner(position) {
    let container = document.getElementById(BANNER_CONTAINER_ID);
    if (!container) {
        container = createBannerContainer(position);
    }

    container.style.display = 'block';

    platformSdk
        .showAd('display', { containerId: BANNER_CONTAINER_ID })
        .then(() => {
            emit('bannerStateChanged', 'shown');
        })
        .catch(() => {
            emit('bannerStateChanged', 'failed');
            container.style.display = 'none';
        });
}

function hideBanner() {
    const container = document.getElementById(BANNER_CONTAINER_ID);
    if (container) {
        container.style.display = 'none';
    }

    emit('bannerStateChanged', 'hidden');
}

document.addEventListener('visibilitychange', () => {
    const isHidden = document.visibilityState === 'hidden';
    emit('pauseStateChanged', isHidden);
    emit('audioStateChanged', !isHidden);
});

window.addEventListener('blur', () => {
    emit('pauseStateChanged', true);
    emit('audioStateChanged', false);
});

window.addEventListener('focus', () => {
    emit('pauseStateChanged', false);
    emit('audioStateChanged', true);
});