/*
 *  Copyright 2019 Anyware Services
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/**
 * @private
 * This is a relation handler between:
 * * source : query or query container
 * * destination : query container
 */
Ext.define('Ametys.plugins.queriesdirectory.relations.QueryRelationHandler', {
    extend: 'Ametys.relation.RelationHandler',
    
    /**
     * @private
     * Do the #supportedRelations work but based only on targets array
     * This method return the list of supported operations between the source and the target points of a relation.
     * The implementation should only handle targets and should not have to check the source and target relations: a later filter is done by the  {@link Ametys.relation.RelationManager}.
     * @param {Ametys.message.MessageTarget[]} sourceTargets The source point of the relation operation. Targets are assumed to be ready.
     * @param {Ametys.message.MessageTarget[]} targetTargets The end point of the relation operation. Targets are assumed to be ready.
     * @return {Ametys.relation.Relation/Ametys.relation.Relation[]} Return the supported operations between those two points. Order matters: after filtering that array, the first relation is considered as the default one.
     */
    _supportedRelations: function(sourceTargets, targetTargets)
    {
        var sourceQueryMatch = Ametys.message.MessageTargetHelper.findTargets(sourceTargets, Ametys.message.MessageTarget.QUERY, 1),
            sourceQueryContainerMatch = Ametys.message.MessageTargetHelper.findTargets(sourceTargets, Ametys.message.MessageTarget.QUERY_CONTAINER, 1);
        if (sourceQueryMatch.length == 0 && sourceQueryContainerMatch.length == 0 
            || (sourceQueryMatch.length + sourceQueryContainerMatch.length) != sourceTargets.length)
        {
            return [];
        }
        
        var targetMatch = Ametys.message.MessageTargetHelper.findTargets(targetTargets, Ametys.message.MessageTarget.QUERY_CONTAINER, 1);
        targetMatch = targetMatch.filter(
            function (target) 
            {
                var parameters = target.parameters || target.getParameters();
                return parameters.canWrite;
            });
        if (targetMatch.length != 1)
        {
            return [];
        }

        var relations = [ 
            Ext.create('Ametys.relation.Relation', {
                type: Ametys.relation.Relation.MOVE,
                label: "{{i18n PLUGINS_QUERIESDIRECTORY_RELATIONS_MOVE_QUERY_LABEL}}",
                description: "{{i18n PLUGINS_QUERIESDIRECTORY_RELATIONS_MOVE_QUERY_DESCRIPTION}}"
            })
        ];
            
        return relations;
    },
    
    supportedRelations: function(source, target)
    {
        return this._supportedRelations(source.targets, target.targets);
    },
    
    /**
     * @private
     * Do the #link work but based only on targets array
     * The method is called to link source to target using the given relation. 
     * This operation can be asynchronous and will invoke a callback at the end.
     * In most cases this implementation will send a {@link Ametys.message.Message} to let the UI know that the operation is finished.
     * @param {Ametys.message.MessageTarget[]} sourceTargets The source point of the link operation. Targets are assumed to be ready.
     * @param {Ametys.message.MessageTarget} target The end point of the link operation. Targets are assumed to be ready.
     * @param {Function} callback The callback to call when the operation has ended. 
     * @param {Boolean} callback.success True if the operation was successful
     */
    _link: function(sourceTargets, target, callback)
    {
        var sourceQuery = Ametys.message.MessageTargetHelper.findTarget(sourceTargets, Ametys.message.MessageTarget.QUERY, 1),
            sourceQueryContainer = Ametys.message.MessageTargetHelper.findTarget(sourceTargets, Ametys.message.MessageTarget.QUERY_CONTAINER, 1),
            newParentId = target.getParameters().id;
        
        if (sourceQuery)
        {
            Ametys.plugins.queriesdirectory.QueriesDAO.moveQuery([sourceQuery.getParameters().id, newParentId], function(response) {
                var success = response.message === undefined;
                callback(success);
            });
        }
        else if (sourceQueryContainer)
        {
            Ametys.plugins.queriesdirectory.QueriesDAO.moveQueryContainer([sourceQueryContainer.getParameters().id, newParentId], function(response) {
                var success = response.message === undefined;
                callback(success);
            });
        }
    },
    
    link: function(source, target, callback, relationType)
    {
        this._link(source.getTargets(), target.getTarget(), callback);
    }
});