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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.provision;

import ai.vespa.validation.PatternedStringWrapper;

import java.util.regex.Pattern;

/**
 * Identifies an account in a public cloud, such as {@link CloudName#AWS} or {@link CloudName#GCP}.
 *
 * @author mpolden
 */
public class CloudAccount extends PatternedStringWrapper<CloudAccount> {

    private static final String EMPTY = "";
    private static final String AWS_ACCOUNT_ID = "[0-9]{12}";
    private static final String GCP_PROJECT_ID = "[a-z][a-z0-9-]{4,28}[a-z0-9]";

    /** Empty value. When this is used, either implicitly or explicitly, the zone will use its default account */
    public static final CloudAccount empty = new CloudAccount("", EMPTY, "cloud account");

    private CloudAccount(String value, String regex, String description) {
        super(value, Pattern.compile("^(" + regex + ")$"), description);
    }

    public boolean isUnspecified() {
        return this.equals(empty);
    }

    /** Returns true if this is an enclave account. */
    public boolean isEnclave(Zone zone) {
        return !isUnspecified() &&
               zone.system().isPublic() &&
               !equals(zone.cloud().account());
    }

    public static CloudAccount from(String cloudAccount) {
        return switch (cloudAccount) {
            // Tenants are allowed to specify "default" in services.xml.
            case "", "default" -> empty;
            default -> new CloudAccount(cloudAccount, AWS_ACCOUNT_ID + "|" + GCP_PROJECT_ID, "cloud account");
        };
    }

    @Override
    public String toString() {
        return isUnspecified() ? "unspecified account" : "account '" + value() + "'";
    }

}