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package io.elastic.sailor;

import com.google.inject.AbstractModule;
import com.google.inject.Provider;
import com.google.inject.name.Names;

public class ServiceEnvironmentModule extends AbstractModule {

    @Override
    protected void configure() {
        bindEnvVars();
    }

    void bindEnvVars() {
        // required env vars
        bindRequiredStringEnvVar(Constants.ENV_VAR_CFG);
        bindRequiredStringEnvVar(Constants.ENV_VAR_POST_RESULT_URL);


        // optional env vars

        bindOptionalStringEnvVar(Constants.ENV_VAR_ACTION_OR_TRIGGER);
        bindOptionalStringEnvVar(Constants.ENV_VAR_GET_MODEL_METHOD);
    }

    void bindRequiredStringEnvVar(final String name) {
        bind(String.class)
                .annotatedWith(Names.named(name))
                .toInstance(Utils.getEnvVar(name));
    }


    void bindOptionalStringEnvVar(final String name) {

        bind(String.class)
                .annotatedWith(Names.named(name))
                .toProvider(new Provider() {

                    @Override
                    public String get() {
                        return Utils.getOptionalEnvVar(name);
                    }
                });
    }
}