/*
 * mongo-edu
 *
 * Copyright (c) 2014 Przemyslaw Pluta
 * Licensed under the MIT license.
 * https://github.com/przemyslawpluta/mongo-edu/blob/master/LICENSE
 */

var mdbvideos = require('./lib/login'),
    videoHandler = require('./lib/videos'),
    validate = require('./lib/validate'),
    configure = require('./lib/configure'),
    path = require('path'),
    colors = require('colors'),
    inquirer = require('inquirer'),
    yargs = require('yargs')
        .usage('Usage: $0 [options]')
        .describe('d', 'download path').describe('u', 'email address')
        .describe('h', 'switch from videos (default) to handouts').boolean('h')
        .describe('py', 'py switch').describe('py', 'switch to point to Python')
        .describe('proxy', 'pass proxy').describe('proxy', 'proxy address')
        .describe('cw', 'switch from wiki\'s video lists (default) to courseware').boolean('cw')
        .describe('cwd', 'same as --cw and dumps list of videos to file in -d').boolean('cwd')
        .describe('cc', 'get closed captions').boolean('cc')
        .describe('hq', 'get high quality videos').boolean('hq')
        .describe('ncc', 'no check certificate').boolean('ncc')
        .describe('uz', 'unzip handout files').boolean('uz')
        .describe('co', 'sequence video files in order of the courseware').boolean('co')
        .describe('verbose', 'print debug information').boolean('verbose')
        .demand('d');

exports.create = function start() {

    'use strict';

    var argv = yargs.argv, lookFor = ((!argv.h)? 'Videos' : 'Handouts'), isWin = /^win/.test(process.platform), slash = (isWin) ? '\\' : '/';

    if (argv.help) { return yargs.showHelp(); }

    argv.d = path.normalize(argv.d);

    if (argv.d.substr(-1) !== slash) { argv.d += slash; }

    if (argv.proxy) { console.log('i'.magenta + ' Proxy Video Download: '.bold + argv.proxy.green); }

    validate.init(argv, function init(err, profile) {
        if (err !== null) { throw err; }

        configure(argv, function conf(err) {
            if (err !== null) { throw err; }
            run(profile);
        });

    });

    function run(profile) {

        inquirer.prompt(profile, function prompt(answers) {

            var list = [{ type: 'list', name: 'url', message: '', choices: [] }], classes = list,

                check = [{ type: 'checkbox', message: '', name: 'videos', choices: [],
                    validate: function validate(answer) {
                        if ( answer.length < 1 ) { return 'You must choose at least one option.'; }
                        return true;
                    }
                }];

            mdbvideos.init(answers, argv, function get(err, data) {
                if (err !== null) { throw err; }

                if (data.length) {

                    classes[0].message = 'Found ' + data.length + ' Course'+ ((data.length > 1)? 's' : '') + '. Select:';
                    classes[0].choices = data;
                    return currentList();

                }

            });

            function currentList() {
                inquirer.prompt(classes, function prompt(answers) {

                    mdbvideos.getList(answers, argv, function get(err, data, pass) {
                        if (err !== null) { throw err; }

                        if (data.length) {

                            if (pass) { return showDetails(err, data); }

                            list[0].message = 'Found ' + data.length + ' List' + ((data.length > 1)? 's' : '') + '. Select:';
                            list[0].choices = data;

                            return currentVideos();

                        } else {
                            if (pass) { return console.log('i'.red + ' Looks like the course is not yet available or has already ended. ' +
                                lookFor + ' list is not available.\n\nCheck the start/end date for selected course.\n'); }
                        }

                        return console.log('i'.red + ' Unable to locate any ' + lookFor.toLowerCase() + ' lists in the wiki. Are ' +
                            lookFor.toLowerCase() + ' list present in the wiki?' +
                            ((lookFor === 'Videos') ? ' Try to add ' + '--cw'.green + ' to switch and search on courseware instead.' : ''));
                    });

                });
            }

            function currentVideos() {

                inquirer.prompt(list, function prompt(answers) {

                    mdbvideos.listVideos(answers, argv, function get(err, data, pass) {
                        if (err !== null) { throw err; }
                        if (!pass) { return videoHandler.details(data, argv, showDetails); }
                        showDetails(err, data);
                    });

                });
            }

            function showDetails(err, data) {
                if (err !== null) { throw err; }

                if (data.length) {
                    check[0].message = 'Select From ' + (data.length - 2) + ' ' + lookFor + '. Download:';
                    check[0].choices = data;

                    return inquirer.prompt(check, function prompt(answers) {
                        videoHandler.download(answers, data, argv);
                    });

                }

                console.log('i'.red + ' Could not locate any ' + lookFor.toLowerCase() + '.'); process.exit(0);
            }

        });

    }

};