/* jslint node: true */
'use strict';

//	ENiGMA½
const MenuModule			= require('../core/menu_module.js').MenuModule;
const ViewController		= require('../core/view_controller.js').ViewController;
const DownloadQueue			= require('../core/download_queue.js');
const theme					= require('../core/theme.js');
const ansi					= require('../core/ansi_term.js');
const Errors				= require('../core/enig_error.js').Errors;
const stringFormat			= require('../core/string_format.js');

//	deps
const async					= require('async');
const _						= require('lodash');

exports.moduleInfo = {
	name		: 'File Base Download Queue Manager',
	desc		: 'Module for interacting with download queue/batch',
	author		: 'NuSkooler',
};

const FormIds = {
	queueManager	: 0,
	details			: 1,
};

const MciViewIds = {
	queueManager : {
		queue	: 1,
		navMenu	: 2,
	},
	details : {

	}
};

exports.getModule = class FileBaseDownloadQueueManager extends MenuModule {

	constructor(options) {
		super(options);

		this.dlQueue = new DownloadQueue(this.client);

		if(_.has(options, 'lastMenuResult.sentFileIds')) {
			this.sentFileIds = options.lastMenuResult.sentFileIds;
		}
		
		this.fallbackOnly = options.lastMenuResult ? true : false;

		this.menuMethods = {
			downloadAll : (formData, extraArgs, cb) => {
				const modOpts = {
					extraArgs : {
						sendQueue : this.dlQueue.items,
					}
				};

				return this.gotoMenu(this.menuConfig.config.fileTransferProtocolSelection || 'fileTransferProtocolSelection', modOpts, cb);
			},
			viewItemInfo : (formData, extraArgs, cb) => {
			},
			removeItem : (formData, extraArgs, cb) => {
				const selectedItem = formData.value.queueItem;
				this.dlQueue.removeItems(selectedItem);
				return this.updateDownloadQueueView(cb);
			},
			clearQueue : (formData, extraArgs, cb) => {
				this.dlQueue.clear();
				return this.updateDownloadQueueView(cb);
			}
		};
	}

	initSequence() {
		if(0 === this.dlQueue.items.length) {
			if(this.sendFileIds) {
				//	we've finished everything up - just fall back
				return this.prevMenu();
			}

			//	Simply an empty D/L queue: Present a specialized "empty queue" page
			//	:TODO: This technique can be applied in many areas of the code; probablly need a better name than 'popAndGotoMenu' though
			//	...actually, the option to not append to the stack would be better here
			return this.gotoMenu(this.menuConfig.config.emptyQueueMenu || 'fileBaseDownloadManagerEmptyQueue');
			//return this.popAndGotoMenu(this.menuConfig.config.emptyQueueMenu || 'fileBaseDownloadManagerEmptyQueue');
		}

		const self = this;

		async.series(
			[
				function beforeArt(callback) {
					return self.beforeArt(callback);
				},
				function display(callback) {
					return self.displayQueueManagerPage(false, callback);
				}
			],
			() => {
				return self.finishedLoading();
			}
		);
	}

	updateDownloadQueueView(cb) {
		const queueView = this.viewControllers.queueManager.getView(MciViewIds.queueManager.queue);
		if(!queueView) {
			return cb(Errors.DoesNotExist('Queue view does not exist'));
		}

		const queueListFormat		= this.menuConfig.config.queueListFormat || '{fileName} {byteSize}';
		const focusQueueListFormat	= this.menuConfig.config.focusQueueListFormat || queueListFormat;

		queueView.setItems(this.dlQueue.items.map( queueItem => stringFormat(queueListFormat, queueItem) ) );
		queueView.setFocusItems(this.dlQueue.items.map( queueItem => stringFormat(focusQueueListFormat, queueItem) ) );

		queueView.redraw();

		return cb(null);
	}

	displayQueueManagerPage(clearScreen, cb) {
		const self = this;

		async.series(
			[
				function prepArtAndViewController(callback) {
					return self.displayArtAndPrepViewController('queueManager', { clearScreen : clearScreen }, callback);
				},
				function populateViews(callback) {
					return self.updateDownloadQueueView(callback);
				}
			],
			err => {
				if(cb) {
					return cb(err);
				}
			}
		);
	}

	displayArtAndPrepViewController(name, options, cb) {
		const self		= this;
		const config	= this.menuConfig.config;

		async.waterfall(
			[
				function readyAndDisplayArt(callback) {
					if(options.clearScreen) {
						self.client.term.rawWrite(ansi.clearScreen());
					}

					theme.displayThemedAsset(
						config.art[name],
						self.client,
						{ font : self.menuConfig.font, trailingLF : false },
						(err, artData) => {
							return callback(err, artData);
						}
					);
				},
				function prepeareViewController(artData, callback) {
					if(_.isUndefined(self.viewControllers[name])) {
						const vcOpts = {
							client		: self.client,
							formId		: FormIds[name],
						};

						if(!_.isUndefined(options.noInput)) {
							vcOpts.noInput = options.noInput;
						}

						const vc = self.addViewController(name, new ViewController(vcOpts));

						const loadOpts = {
							callingMenu		: self,
							mciMap			: artData.mciMap,
							formId			: FormIds[name],
						};

						return vc.loadFromMenuConfig(loadOpts, callback);
					}
					
					self.viewControllers[name].setFocus(true);
					return callback(null);
										
				},
			],
			err => {
				return cb(err);
			}
		);
	}
};