/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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
 *
 *    https://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.
 */
package org.grails.async.factory.rxjava2

import grails.async.PromiseList
import spock.lang.Specification
import spock.util.concurrent.PollingConditions

/**
 * Created by graemerocher on 31/03/2017.
 */
class RxPromiseListSpec extends Specification {

    void 'Test promise list handling'() {

        when: 'a list of promises is created'
            def list = new PromiseList()
            list << { 1 }
            list << { 2 }
            list << { 3 }
            def result = null
            list.onComplete { result = it }

        then: 'then the result from onComplete is correct'
            new PollingConditions(timeout: 5, delay: 0.2).eventually {
                assert result == [1,2,3]
            }
    }

    void 'Test promise list handling with some async operations and some values'() {

        when: 'a list of promises is created'
            def list = new PromiseList()
            list << { 1 }
            list <<  2
            list << { 3 }
            def result = null
            list.onComplete { result = it }

        then: 'then the result from onComplete is correct'
            new PollingConditions(timeout: 5, delay: 0.2).eventually {
                assert result == [1,2,3]
            }
    }

    void 'Test promise list with then chaining'() {

        when: 'a promise list is used with then chaining'
            def list = new PromiseList()
            list << { 1 }
            def promise = list
                .then { it << 2; it }
                .then {
                    Thread.dumpStack()
                    it << 3; it
                }
            def result = promise.get()

        then: 'An appropriately populated list is produced'
            result == [1,2,3]

    }

    void 'Test promise list with an exception'() {

        given: 'a promise list with a promise that throws an exception'
            def list = new PromiseList()
            list << { 1 }
            list << { throw new RuntimeException('bad') }
            list << { 3 }

        when: 'the list is completed'
            def result = null
            Throwable error = null
            list.onComplete { result = it }
            list.onError { error = it }.get()
            list.get()

        then: 'the onError handler is invoked with the exception'
            thrown(RuntimeException)
            !result
            error
            error.message == 'bad'
    }
}
