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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.provision;

/**
 * Environments in hosted Vespa.
 *
 * @author bratseth
 * @since 5.11
 */
public enum Environment {

    /** The environment in which any external or internal applications serve actual requests */
    prod,

    /** Production-like environment which runs staging tests before an app is deployed to production */
    staging,

    /** Environment for running system tests before an app is deployed to staging */
    test,

    /** Environment used by individual developers to experiment */
    dev,

    /** Environment used to run performance and stability experiments */
    perf;

    /** Returns whether deployments to this environment are done manually */
    public boolean isManuallyDeployed() { return this == dev || this == perf; }

    /** Returns the prod environment. This is useful for non-hosted properties where we just need any consistent value */
    public static Environment defaultEnvironment() { return prod; }

    /** Returns the environment name from the string value returned by value() */
    public static Environment from(String value) {
        switch(value) {
            case "prod" : return prod;
            case "staging" : return staging;
            case "test" : return test;
            case "dev" : return dev;
            case "perf" : return perf;
            default : throw new IllegalStateException("'" + value + "' is not a valid environment identifier");
        }
    }

    /** Returns a name of this which is used in external API's and stored in persistent stores */
    public String value() {
        switch(this) {
            case prod : return "prod";
            case staging : return "staging";
            case test : return "test";
            case dev : return "dev";
            case perf : return "perf";
            default : throw new IllegalStateException();
        }
    }

}