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

//  enigma-bbs
const MenuModule        = require('./menu_module.js').MenuModule;
const Config            = require('./config.js').get;
const stringFormat      = require('./string_format.js');
const ViewController    = require('./view_controller.js').ViewController;

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

exports.moduleInfo = {
    name    : 'File transfer protocol selection',
    desc    : 'Select protocol / method for file transfer',
    author  : 'NuSkooler',
};

const MciViewIds = {
    protList    : 1,
};

exports.getModule = class FileTransferProtocolSelectModule extends MenuModule {

    constructor(options) {
        super(options);

        this.config = this.menuConfig.config || {};

        if(options.extraArgs) {
            if(options.extraArgs.direction) {
                this.config.direction = options.extraArgs.direction;
            }
        }

        this.config.direction = this.config.direction || 'send';

        this.extraArgs  = options.extraArgs;

        if(_.has(options, 'lastMenuResult.sentFileIds')) {
            this.sentFileIds = options.lastMenuResult.sentFileIds;
        }

        if(_.has(options, 'lastMenuResult.recvFilePaths')) {
            this.recvFilePaths = options.lastMenuResult.recvFilePaths;
        }

        this.fallbackOnly   = options.lastMenuResult ? true : false;

        this.loadAvailProtocols();

        this.menuMethods = {
            selectProtocol : (formData, extraArgs, cb) => {
                const protocol  = this.protocols[formData.value.protocol];
                const finalExtraArgs = this.extraArgs || {};
                Object.assign(finalExtraArgs, { protocol : protocol.protocol, direction : this.config.direction }, extraArgs );

                const modOpts = {
                    extraArgs : finalExtraArgs,
                };

                if('send' === this.config.direction) {
                    return this.gotoMenu(this.config.downloadFilesMenu || 'sendFilesToUser', modOpts, cb);
                } else {
                    return this.gotoMenu(this.config.uploadFilesMenu || 'recvFilesFromUser', modOpts, cb);
                }
            },
        };
    }

    getMenuResult() {
        if(this.sentFileIds) {
            return { sentFileIds : this.sentFileIds };
        }

        if(this.recvFilePaths) {
            return { recvFilePaths : this.recvFilePaths };
        }
    }

    initSequence() {
        if(this.sentFileIds || this.recvFilePaths) {
            //  nothing to do here; move along (we're just falling through)
            this.prevMenu();
        } else {
            super.initSequence();
        }
    }

    mciReady(mciData, cb) {
        super.mciReady(mciData, err => {
            if(err) {
                return cb(err);
            }

            const self  = this;
            const vc    = self.viewControllers.allViews = new ViewController( { client : self.client } );

            async.series(
                [
                    function loadFromConfig(callback) {
                        const loadOpts = {
                            callingMenu     : self,
                            mciMap          : mciData.menu
                        };

                        return vc.loadFromMenuConfig(loadOpts, callback);
                    },
                    function populateList(callback) {
                        const protListView = vc.getView(MciViewIds.protList);

                        const protListFormat        = self.config.protListFormat || '{name}';
                        const protListFocusFormat   = self.config.protListFocusFormat || protListFormat;

                        protListView.setItems(self.protocols.map(p => stringFormat(protListFormat, p) ) );
                        protListView.setFocusItems(self.protocols.map(p => stringFormat(protListFocusFormat, p) ) );

                        protListView.redraw();

                        return callback(null);
                    }
                ],
                err => {
                    return cb(err);
                }
            );
        });
    }

    loadAvailProtocols() {
        this.protocols = _.map(Config().fileTransferProtocols, (protInfo, protocol) => {
            return {
                protocol    : protocol,
                name        : protInfo.name,
                hasBatch    : _.has(protInfo, 'external.recvArgs'),
                hasNonBatch : _.has(protInfo, 'external.recvArgsNonBatch'),
                sort        : protInfo.sort,
            };
        });

        //  Filter out batch vs non-batch only protocols
        if(this.extraArgs.recvFileName) {   //  non-batch aka non-blind
            this.protocols = this.protocols.filter( prot => prot.hasNonBatch );
        } else {
            this.protocols = this.protocols.filter( prot => prot.hasBatch );
        }

        //  natural sort taking explicit orders into consideration
        this.protocols.sort( (a, b) => {
            if(_.isNumber(a.sort) && _.isNumber(b.sort)) {
                return a.sort - b.sort;
            } else {
                return a.name.localeCompare(b.name, { sensitivity : false, numeric : true } );
            }
        });
    }
};