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package com.aliyuncs.v5.auth;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

public class InstanceProfileCredentials extends BasicSessionCredentials {

    private final long expiration;
    private final double expireFact = 0.95;
    private final long refreshIntervalInMillSeconds = 180000;
    private long lastFailedRefreshTime = 0;

    public InstanceProfileCredentials(String accessKeyId, String accessKeySecret, String sessionToken,
            String expiration, long roleSessionDurationSeconds) {
        super(accessKeyId, accessKeySecret, sessionToken, roleSessionDurationSeconds);

        SimpleDateFormat parser = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        parser.setTimeZone(TimeZone.getTimeZone("GMT"));
        try {
            Date date = parser.parse(expiration.replace('T', ' ').replace('Z', ' '));
            this.expiration = date.getTime();
        } catch (ParseException e) {
            throw new IllegalArgumentException("Failed to get valid expiration time from ECS Metadata service.");
        }
    }

    @Override
    public boolean willSoonExpire() {
        long now = System.currentTimeMillis();
        return this.roleSessionDurationSeconds * (1 - expireFact) > (expiration - now) / 1000;
    }

    public boolean isExpired() {
        long now = System.currentTimeMillis();
        return now >= expiration - refreshIntervalInMillSeconds;
    }

    public boolean shouldRefresh() {
        long now = System.currentTimeMillis();
        return now - lastFailedRefreshTime > refreshIntervalInMillSeconds;
    }

    public void setLastFailedRefreshTime() {
        lastFailedRefreshTime = System.currentTimeMillis();
    }
}