// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.container.bundle;

import com.yahoo.component.ComponentId;
import com.yahoo.component.ComponentSpecification;


/**
 * Specifies how a component should be instantiated from a bundle.
 *
 * Immutable
 *
 * @author Tony Vaagenes
 */
public final class BundleInstantiationSpecification {

    public static final String CONTAINER_SEARCH_AND_DOCPROC = "container-search-and-docproc";

    public final ComponentId id;
    public final ComponentSpecification classId;
    public final ComponentSpecification bundle;

    public BundleInstantiationSpecification(ComponentSpecification id,  ComponentSpecification classId, ComponentSpecification bundle) {
        this.id = id.toId();
        this.classId = (classId != null) ? classId : id.withoutNamespace();
        this.bundle = (bundle != null) ? bundle : this.classId;
    }

    // Must only be used when classId != null, otherwise the id must be handled as a ComponentSpecification
    // (since converting a spec string to a ComponentId and then to a ComponentSpecification causes loss of information).
    public BundleInstantiationSpecification(ComponentId id, ComponentSpecification classId, ComponentSpecification bundle) {
        this(id.toSpecification(), classId, bundle);
        assert (classId!= null);
    }

    /**
     * Create spec for a component from the container-search-and-docproc bundle with the given class name as id.
     */
    public static BundleInstantiationSpecification fromSearchAndDocproc(String className) {
        return fromSearchAndDocproc(new ComponentSpecification(className), null);
    }

    /**
     * Create spec for a component from the container-search-and-docproc bundle with the given id and classId.
     */
    public static BundleInstantiationSpecification fromSearchAndDocproc(ComponentSpecification id, ComponentSpecification classId) {
        return new BundleInstantiationSpecification(id, classId, new ComponentSpecification(CONTAINER_SEARCH_AND_DOCPROC));
    }

    public static BundleInstantiationSpecification fromStrings(String idSpec, String classSpec, String bundleSpec) {
        return new BundleInstantiationSpecification(
                new ComponentSpecification(idSpec),
                (classSpec == null || classSpec.isEmpty())?  null  : new ComponentSpecification(classSpec),
                (bundleSpec == null || bundleSpec.isEmpty())? null : new ComponentSpecification(bundleSpec));
    }

    /**
     * Return a new instance of the specification with bundle name altered
     *
     * @param bundleName the new name of the bundle
     * @return the new instance of the specification
     */
    public BundleInstantiationSpecification inBundle(String bundleName) {
        return new BundleInstantiationSpecification(this.id, this.classId, new ComponentSpecification(bundleName));
    }

    public String getClassName() {
        return classId.getName();
    }

    public BundleInstantiationSpecification nestInNamespace(ComponentId namespace) {
        return new BundleInstantiationSpecification(id.nestInNamespace(namespace), classId, bundle);
    }

}