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package io.sphere.internal.oauth;

import com.google.common.base.Function;
import com.google.common.base.Optional;

/** Helper class for {@link SphereClientCredentials}. */
public class AccessToken {
    private String accessToken;
    private Optional originalExpiresInSeconds;
    /** Time the tokens stored inside this instance were last refreshed, in System.currentTimeMillis(). */
    private long updatedTimestamp;

    public AccessToken(String accessToken, Optional originalExpiresInSeconds, long updatedTimestamp) {
        this.accessToken = accessToken;
        this.originalExpiresInSeconds = originalExpiresInSeconds;
        this.updatedTimestamp = updatedTimestamp;
    }

    public String getAccessToken() { return accessToken; }

    public Optional getOriginalExpiresInSeconds() { return originalExpiresInSeconds; }

    public long getUpdatedTimestamp() { return updatedTimestamp; }

    public Optional getRemaniningMs() {
        return getOriginalExpiresInSeconds().transform(new Function() {
            public Long apply(Long originalExpiresInSec) {
                long expiresAtMs = updatedTimestamp + 1000 * originalExpiresInSec;
                long remainingMs = expiresAtMs - System.currentTimeMillis();
                return remainingMs;
            }
        });
    }
}