/*
 * Copyright 2015-2016 IBM Corporation
 *
 * 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.
 */

import Foundation

class SequenceCode {
    
    static let codeStr = "function main(msg) {" +
    "var actions = msg['_actions'];" +
    "if (typeof actions === 'string') {" +
    "try {" +
    "actions = JSON.parse(actions);" +
    "} catch (e) {" +
    "return whisk.error('invalid sequence of actions');}}" +
    "if (!Array.isArray(actions)) {" +
    "return whisk.error('invalid sequence of actions');" +
    "}" +
    "console.log(actions.length, 'actions to invoke:', actions);" +
    "var input = msg;" +
    "delete input['_actions'];" +
    "console.log('input to first action:', JSON.stringify(input));" +
    "invokeActions(actions, input, function(result) {" +
    "console.log('chain ending with result', JSON.stringify(result));" +
    "whisk.done(result);" +
    "});" +
    "return whisk.async();}" +
    "function invokeActions(actions, input, terminate) {" +
    "if (Array.isArray(actions) && actions.length > 0) {" +
    "var params = {" +
    "name: actions[0]," +
    "parameters: input," +
    "blocking: true," +
    "next: function(error, activation) {" +
    "if (!error) {" +
    "console.log('invoke action', actions[0]);" +
    "console.log('  id:', activation.activationId);" +
    "console.log('  input:', input);" +
    "console.log('  result:', activation.result);" +
    "actions.shift();" +
    "invokeActions(actions, activation.result, terminate);" +
    "} else {" +
    "console.log('stopped chain at', actions[0], 'because of an error:', error);" +
    "whisk.error(error);}}};" +
    "whisk.invoke(params);" +
    "} else terminate(input);" +
    "}"
    
    class func getSequenceCode() -> String {
        return codeStr
    }
}