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

//  ENiGMA½
const MenuModule            = require('./menu_module.js').MenuModule;
const ViewController        = require('./view_controller.js').ViewController;
const DownloadQueue         = require('./download_queue.js');
const theme                 = require('./theme.js');
const ansi                  = require('./ansi_term.js');
const Errors                = require('./enig_error.js').Errors;
const stringFormat          = require('./string_format.js');
const FileAreaWeb           = require('./file_area_web.js');
const ErrNotEnabled         = require('./enig_error.js').ErrorReasons.NotEnabled;
const Config                = require('./config.js').get;

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

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

const FormIds = {
    queueManager    : 0
};

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

        customRangeStart    : 10,
    }
};

exports.getModule = class FileBaseWebDownloadQueueManager extends MenuModule {

    constructor(options) {
        super(options);

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

        this.menuMethods = {
            removeItem : (formData, extraArgs, cb) => {
                const selectedItem = this.dlQueue.items[formData.value.queueItem];
                if(!selectedItem) {
                    return cb(null);
                }

                this.dlQueue.removeItems(selectedItem.fileId);

                //  :TODO: broken: does not redraw menu properly - needs fixed!
                return this.removeItemsFromDownloadQueueView(formData.value.queueItem, cb);
            },
            clearQueue : (formData, extraArgs, cb) => {
                this.dlQueue.clear();

                //  :TODO: broken: does not redraw menu properly - needs fixed!
                return this.removeItemsFromDownloadQueueView('all', cb);
            },
            getBatchLink : (formData, extraArgs, cb) => {
                return this.generateAndDisplayBatchLink(cb);
            }
        };
    }

    initSequence() {
        if(0 === this.dlQueue.items.length) {
            return this.gotoMenu(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();
            }
        );
    }

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

        if('all' === itemIndex) {
            queueView.setItems([]);
            queueView.setFocusItems([]);
        } else {
            queueView.removeItem(itemIndex);
        }

        queueView.redraw();
        return cb(null);
    }

    displayFileInfoForFileEntry(fileEntry) {
        this.updateCustomViewTextsWithFilter(
            'queueManager',
            MciViewIds.queueManager.customRangeStart, fileEntry,
            { filter : [ '{webDlLink}', '{webDlExpire}', '{fileName}' ] }   //  :TODO: Others....
        );
    }

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

        queueView.setItems(this.dlQueue.items);

        queueView.on('index update', idx => {
            const fileEntry = this.dlQueue.items[idx];
            this.displayFileInfoForFileEntry(fileEntry);
        });

        queueView.redraw();
        this.displayFileInfoForFileEntry(this.dlQueue.items[0]);

        return cb(null);
    }

    generateAndDisplayBatchLink(cb) {
        const expireTime = moment().add(Config().fileBase.web.expireMinutes, 'minutes');

        FileAreaWeb.createAndServeTempBatchDownload(
            this.client,
            this.dlQueue.items,
            {
                expireTime : expireTime
            },
            (err, webBatchDlLink) => {
                //  :TODO: handle not enabled -> display such
                if(err) {
                    return cb(err);
                }

                const webDlExpireTimeFormat = this.menuConfig.config.webDlExpireTimeFormat || 'YYYY-MMM-DD @ h:mm';

                const formatObj = {
                    webBatchDlLink      : ansi.vtxHyperlink(this.client, webBatchDlLink) + webBatchDlLink,
                    webBatchDlExpire    : expireTime.format(webDlExpireTimeFormat),
                };

                this.updateCustomViewTextsWithFilter(
                    'queueManager',
                    MciViewIds.queueManager.customRangeStart,
                    formatObj,
                    { filter : Object.keys(formatObj).map(k => '{' + k + '}' ) }
                );

                return cb(null);
            }
        );
    }

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

        async.series(
            [
                function prepArtAndViewController(callback) {
                    return self.displayArtAndPrepViewController('queueManager', { clearScreen : clearScreen }, callback);
                },
                function prepareQueueDownloadLinks(callback) {
                    const webDlExpireTimeFormat = self.menuConfig.config.webDlExpireTimeFormat || 'YYYY-MMM-DD @ h:mm';

                    const config = Config();
                    async.each(self.dlQueue.items, (fileEntry, nextFileEntry) => {
                        FileAreaWeb.getExistingTempDownloadServeItem(self.client, fileEntry, (err, serveItem) => {
                            if(err) {
                                if(ErrNotEnabled === err.reasonCode) {
                                    return nextFileEntry(err);  //  we should have caught this prior
                                }

                                const expireTime = moment().add(config.fileBase.web.expireMinutes, 'minutes');

                                FileAreaWeb.createAndServeTempDownload(
                                    self.client,
                                    fileEntry,
                                    { expireTime : expireTime },
                                    (err, url) => {
                                        if(err) {
                                            return nextFileEntry(err);
                                        }

                                        fileEntry.webDlLinkRaw  = url;
                                        fileEntry.webDlLink     = ansi.vtxHyperlink(self.client, url) + url;
                                        fileEntry.webDlExpire   = expireTime.format(webDlExpireTimeFormat);

                                        return nextFileEntry(null);
                                    }
                                );
                            } else {
                                fileEntry.webDlLinkRaw  = serveItem.url;
                                fileEntry.webDlLink     = ansi.vtxHyperlink(self.client, serveItem.url) + serveItem.url;
                                fileEntry.webDlExpire   = moment(serveItem.expireTimestamp).format(webDlExpireTimeFormat);
                                return nextFileEntry(null);
                            }
                        });
                    }, err => {
                        return callback(err);
                    });
                },
                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.resetScreen());
                    }

                    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);
            }
        );
    }
};