/*!
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 *
 * 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 {actionTypes} from './HeatSetupConstants.js';
import differenceWith from 'lodash/differenceWith.js';


const emptyModule = (isBase, currentLength) => ({
	name: `${isBase ? 'base_' : 'module_'}${currentLength + 1}`,
	isBase: isBase
});

function syncUnassignedFilesWithArtifactsChanges(unassigned, artifacts, oldArtifacts) {
	if (artifacts.length > oldArtifacts.length) {
		return differenceWith(unassigned, artifacts, (unassignedFile, artifact) => unassignedFile === artifact);
	}
	else {
		const removedArtifact = differenceWith(oldArtifacts, artifacts, (oldArtifact, artifact) => artifact === oldArtifact);
		return [...unassigned, removedArtifact[0]];
	}
}

function findModuleIndexByName(modules, name) {
	return modules.findIndex(module => module.name === name);
}

function addDeletedModuleFilesToUnassigned(unassigned, deletedModule){
	let files = [];
	for(let i in deletedModule){
		if (deletedModule.hasOwnProperty(i)) {
			if (typeof deletedModule[i] === 'string' && deletedModule[i] && i !== 'name') {
				files.push(deletedModule[i]);
			}
		}
	}

	return unassigned.concat(files);
}

export default (state = {}, action) => {
	switch (action.type) {
		case actionTypes.MANIFEST_LOADED:
			return {
				...state,
				...action.response,
				modules: action.response.modules.map(module => ({...module, name: module.name || module.yaml.substring(0, module.yaml.lastIndexOf('.'))}))
			};
		case actionTypes.ARTIFACT_LIST_CHANGE:
			return {
				...state,
				artifacts: action.data.artifacts,
				unassigned: syncUnassignedFilesWithArtifactsChanges(state.unassigned, action.data.artifacts, state.artifacts)
			};
		case actionTypes.ADD_ALL_UNASSIGNED_TO_ARTIFACTS:
			return {
				...state,
				artifacts: [...state.artifacts,...state.unassigned],
				unassigned: []
			};
		case actionTypes.ADD_ALL_ARTIFACTS_TO_UNASSIGNED:
			return {
				...state,
				artifacts: [],
				unassigned: [...state.unassigned, ...state.artifacts]
			};
		case actionTypes.ADD_MODULE:
			return {
				...state,
				modules: state.modules.concat({...emptyModule(action.data.isBase, state.modules.length)})
			};
		case actionTypes.REMOVE_MODULE:
			const moduleIndexToDelete = findModuleIndexByName(state.modules, action.data.moduleName);
			let unassigned = addDeletedModuleFilesToUnassigned(state.unassigned, state.modules[moduleIndexToDelete]);
			return {
				...state,
				unassigned,
				modules: [...state.modules.slice(0, moduleIndexToDelete), ...state.modules.slice(moduleIndexToDelete + 1)]
			};
		case actionTypes.RENAME_MODULE:
			const indexToRename = findModuleIndexByName(state.modules, action.data.oldName);
			let moduleToRename = state.modules[indexToRename];
			moduleToRename.name = action.data.newName;
			return {
				...state,
				modules: [...state.modules.slice(0, indexToRename), moduleToRename, ...state.modules.slice(indexToRename + 1)]
			};
		case actionTypes.FILE_ASSIGN_CHANGED:
			let {module, value:{value}, type} = action.data;
			const moduleIndexToModify = findModuleIndexByName(state.modules, module.name);
			let moduleToModify = state.modules[moduleIndexToModify];
			let dumpedFile = moduleToModify[type];
			if (dumpedFile !== value) {
				if(value) {
					moduleToModify[type] = value;
				}
				else {
					delete moduleToModify[type];
				}
				const newUnassignedList = dumpedFile ? [...state.unassigned.filter(file => file !== value), dumpedFile] : state.unassigned.filter(file => file !== value);
				return {
					...state,
					modules: [...state.modules.slice(0, moduleIndexToModify), moduleToModify, ...state.modules.slice(moduleIndexToModify + 1)],
					unassigned: newUnassignedList
				};
			}
			else {
				return state;
			}
		default:
			return state;
	}
};