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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 * http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.sling.hapi;

import javax.jcr.Node;
import javax.jcr.RepositoryException;

import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.osgi.annotation.versioning.ProviderType;

@ProviderType
public interface HApiUtil {

    String DEFAULT_RESOURCE_TYPE = "sling/hapi/components/type";
    String RESOURCE_TYPE = "org.apache.sling.hapi.tools.resourcetype";
    String RESOURCE_TYPE_DESC = "The resource used for hapi types";

    String DEFAULT_COLLECTION_RESOURCE_TYPE = "sling/hapi/components/typescollection";
    String COLLECTION_RESOURCE_TYPE = "org.apache.sling.hapi.tools.collectionresourcetype";
    String COLLECTION_RESOURCE_TYPE_DESC = "The resource used for hapi type collections";

    String DEFAULT_SEARCH_PATH = "/libs/sling/hapi/types";
    String SEARCH_PATHS = "org.apache.sling.hapi.tools.searchpaths";
    String SEARCH_PATHS_DESC = "The path under which children resources can be identified as hapi types by their FQDN value in addition to the type path";

    String DEFAULT_SERVER_URL = "http://localhost:8080";
    String EXTERNAL_URL = "org.apache.sling.hapi.tools.externalurl";
    String EXTERNAL_URL_DESC = "The external URL of the instance. This will prefix hapi absolute URLs";

    boolean DEFAULT_ENABLED = true;
    String ENABLED = "org.apache.sling.hapi.tools.enabled";
    String ENABLED_DESC = "Whether hapi is enabled or completely disabled (no output rendered in components)";

    /**
     * <p>Get a HApi type jcr node from a type identifier.</p>
     * <p>The JCR node must be [nt:unstructured], a descendant of any of the HAPi search path defined by the
     * {@see HAPI_PATHS} config and the sling:resourceType should be set to the value defined by the {@see HAPI_RESOURCE_TYPE} config</p>
     * <p>The first result is returned</p>
     * @param resolver The sling resource resolver object
     * @param type The type identifier, which is either in the form of a jcr path,
     *             same as the path for {@link: ResourceResolver#getResource(String)}. If the path cannot be resolved, type is treated like
     *             a fully qualified domain name, which has to match the "fqdn" property on the JCR node which represents the type.
     * @return The first node that matches that type or null if none is found.
     * @throws RepositoryException
     */
    @Deprecated
    Node getTypeNode(ResourceResolver resolver, String type) throws RepositoryException;


    /**
     * <p>Get a HApi type Resource from a type identifier.</p>
     * <p>The Resource must be [nt:unstructured], a descendant of any of the HAPi search path defined by the
     * {@see HAPI_PATHS} config and the sling:resourceType should be set to the value defined by the {@see HapiUtil#RESOURCE_TYPE}
     * config</p>
     * <p>The first result is returned</p>
     * @param resolver The sling resource resolver object
     * @param type The type identifier, which is either in the form of a jcr path,
     *             same as the path for {@link: ResourceResolver#getResource(String)}. If the path cannot be resolved, type is treated like
     *             a fully qualified domain name, which has to match the "fqdn" property on the Resource which represents the type.
     * @return The first Resource that matches that type or null if none is found.
     * @throws RepositoryException
     */
    Resource getTypeResource(ResourceResolver resolver, String type) throws RepositoryException;

    /**
     * <p>Get a HApi type collection Resource from a collection identifier.</p>
     * <p>The Resource must be [nt:unstructured], a descendant of any of the HAPi search path defined by the
     * {@see HAPI_PATHS} config and the sling:resourceType should be set to the value defined by the
     * {@see HapiUtil#COLLECTION_RESOURCE_TYPE} config</p>
     * <p>The first result is returned</p>
     * @param resolver The sling resource resolver object
     * @param collection The collection identifier, which is either in the form of a jcr path,
     *             same as the path for {@link: ResourceResolver#getResource(String)}. If the path cannot be resolved, collection is
     *             treated like a fully qualified domain name, which has to match the "fqdn" property on the Resource which
     *                   represents the type.
     * @return The first Resource that matches that collection or null if none is found.
     * @throws RepositoryException
     */
    Resource getTypeCollectionResource(ResourceResolver resolver, String collection) throws RepositoryException;

    /**
     * <p>Get a HApi type object from a type identifier.</p>
     * <p>The type identifier is resolved to a {@link javax.jcr.Node} and then
     * {@link #fromNode(org.apache.sling.api.resource.ResourceResolver, javax.jcr.Node)} is called.</p>
     * <p>For restrictions on the {@link javax.jcr.Node}
     * see {@link HApiUtil#getTypeNode(org.apache.sling.api.resource.ResourceResolver, String)}</p>
     * @param resolver The sling resource resolver object
     * @param type The type identifier, which is either in the form of a jcr path,
     *             same as the path for{@link: ResourceResolver#getResource(String)}. If the path cannot be resolved, type is treated like
     *             a fully qualified domain name, which has to match the "fqdn" property on the JCR node which represents the type.
     * @return The HApiType resolved from the type identifier
     * @throws javax.jcr.RepositoryException
     */
    HApiType fromPath(ResourceResolver resolver, String type) throws RepositoryException;

    /**
     * <p>Get a HApi type object from the {@link javax.jcr.Node}.</p>
     * The Node has the following properties:
     * <ul>
     *     <li>name: A 'Name' of the type (mandatory)</li>
     *     <li>description: A 'String' with the description text for this type (mandatory)</li>
     *     <li>fqdn: A 'String' with the fully qualified domain name; A namespace like a java package (mandatory)</li>
     *     <li>extends: A type identifier (either a path or a fqdn); (optional). This defines the parent type of this type</li>
     *     <li>parameter: A multivalue property to define a list of java-like generic types
     *     that can be used as types for properties; (optional)</li>
     * </ul>
     *
     * <p>The properties of this type are defined as children nodes.</p>
     * <p>The name of property node defines the name of the property for this type. </p>
     * The children property nodes have the following properties:
     * <ul>
     *     <li>type: The type identifier (mandatory). Can be of type 'Name' or 'Path'
     *      See {@link HApiUtil#getTypeNode(org.apache.sling.api.resource.ResourceResolver, String)}
     *      for the format of this value</li>
     *     <li>description: A 'String' with the description for this property (mandatory)</li>
     *     <li>multiple: A 'Boolean' that defines whether this property can exist multiple times on an object of this type (optional)</li>
     * </ul>
     *
     * @param resolver The resource resolver
     * @param typeNode The jcr node of the HApi type
     * @return The HApiType
     * @throws RepositoryException
     */
    @Deprecated
    HApiType fromNode(ResourceResolver resolver, Node typeNode) throws RepositoryException;

    /**
     * <p>Get a HApi type object from the {@link org.apache.sling.api.resource.Resource}.</p>
     * The Resource has the following properties:
     * <ul>
     *     <li>name: A 'Name' of the type (mandatory)</li>
     *     <li>description: A 'String' with the description text for this type (mandatory)</li>
     *     <li>fqdn: A 'String' with the fully qualified domain name; A namespace like a java package (mandatory)</li>
     *     <li>extends: A type identifier (either a path or a fqdn); (optional). This defines the parent type of this type</li>
     *     <li>parameter: A multivalue property to define a list of java-like generic types
     *     that can be used as types for properties; (optional)</li>
     * </ul>
     *
     * <p>The properties of this type are defined as children resources.</p>
     * <p>The name of property resource defines the name of the property for this type. </p>
     * The children property nodes have the following properties:
     * <ul>
     *     <li>type: The type identifier (mandatory). Can be of type 'Name' or 'Path'
     *      See {@link HApiUtil#getTypeNode(org.apache.sling.api.resource.ResourceResolver, String)}
     *      for the format of this value</li>
     *     <li>description: A 'String' with the description for this property (mandatory)</li>
     *     <li>multiple: A 'Boolean' that defines whether this property can exist multiple times on an object of this type (optional)</li>
     * </ul>
     *
     * @param resolver The resource resolver
     * @param typeResource The sling Resource of the HApi type
     * @return The HApiType
     * @throws RepositoryException
     */
    HApiType fromResource(ResourceResolver resolver, Resource typeResource) throws RepositoryException;

    /**
     * <p>Get a {@link HApiTypesCollection} object from a {@link org.apache.sling.api.resource.Resource}.</p>
     * The Resource has the following properties:
     * <ul>
     *     <li>name: A 'Name' of the type collection (mandatory)</li>
     *     <li>description: A 'String' with the description text for this type collection (mandatory)</li>
     *     <li>fqdn: A 'String' with the fully qualified domain name; A namespace like a java package (mandatory)</li>
     * </ul>
     *
     * <p> The types collection will be populated with direct child Resources of the {{collectionResource}},
     * which have the resourceType equal to the value of the {@link HApiUtil#RESOURCE_TYPE} property
     *
     * @param resolver The resource resolver
     * @param collectionResource The sling Resource of the HApi type collection
     * @return The HApiTypesCollection
     * @throws RepositoryException
     */
    HApiTypesCollection collectionFromResource(ResourceResolver resolver, Resource collectionResource) throws RepositoryException;

    /**
     * <p>Get a {@link HApiTypesCollection} object from a path String.</p>
     * <p>{@see HApiUtil#collectionFromResource}</p>
     *
     * @param resolver The resource resolver
     * @param collectionPath The sling resource path of the HApi type collection
     * @return The HApiTypesCollection
     * @throws RepositoryException
     */
    HApiTypesCollection collectionFromPath(ResourceResolver resolver, String collectionPath) throws RepositoryException;

    /**
     * Get a new instance of AttributeHelper for the type identified by 'type'
     * @param resolver
     * @param type See {@link #getTypeNode(org.apache.sling.api.resource.ResourceResolver, String)}
     *             for the format of the type identifier
     * @return
     * @throws RepositoryException
     */
    MicrodataAttributeHelper getHelper(ResourceResolver resolver, String type) throws RepositoryException;
}