window.jQuery = window.jQuery || {};
window.instasScript = window.instasScript || {};

( function( window, document, $, app, undefined ) {
    'use strict';

    /**
     * Instagram Downloader Script
     *
     * Instructions:
     *
     * 1. Go to your Instagram profile url (e.g. https://instagram.com/jtsternberg/)
     * 2. Scroll to the bottom, and click the "LOAD MORE" button. This triggers the auto-loading on scroll - http://b.ustin.co/142xL (if you forget, it will prompt you)
     * 3. Copy this entire thing to your javascript console. (only tested on chrome)
     * 4. Hit enter and watch your images download.
     * 5. To stop the process, close the tab or refresh (or hit your escape key).
     */


    /**
     * instagram image - http://b.ustin.co/1aLvI
     *
     * @type {String}
     */
    app.instaImageSelector = '._22yr2';

    /**
     * Full-size instagram image after the modal opens - http://b.ustin.co/18xhe
     *
     * @type {String}
     */
    app.modalImageSelector = '._n3cp9._d20no ._jjzlb img';

    /**
     * Full-size instagram video after the modal opens
     *
     * @type {String}
     */
    app.modalVideoSelector = '._n3cp9._d20no ._2tomm video';

    /**
     * "Load More" button selector
     *
     * @type {String}
     */
    app.loadMoreSelector = '._oidfu';

    /**
     * Closes the modal
     *
     * @type {String}
     */
    app.closeButtonSelector = '._3eajp';

    /**
     * Amount of time to allow the image to download. May need to increase this value on a slow connection.
     *
     * @type {Number}
     */
    app.downloadBufferTime = 800;

    /**
     * Amount of time to allow the freshly-loaded images (after scroll) to load. May need to increase this value on a slow connection.
     *
     * @type {Number}
     */
    app.loadMoreBufferTime = 2000;

    /**
     * Amount of time to allow the modal to load after triggering it.
     *
     * @type {Number}
     */
    app.waitForModalTime = 200;


    var notified = false;
    var stop = false;

    app.dowloaded = [];

    app.init = function() {

        var go = function() {
            alert( "Ok, we're about to begin! Press the 'escape' key to stop the the downloads." );
            $ = jQuery;

            // Listen for escape to stop the import
            $( document ).on( 'keyup', function( evt ) {
                if ( 27 === evt.keyCode ) {
                    console.warn( 'STOP dowload script' );
                    stop = true;
                }
            });

            app.processNext();
        };

        if ( ! window.jQuery || ! window.jQuery.fn ) {
            app.loadjQuery();
            setTimeout( go, 1000 );
        } else {
            setTimeout( go, 200 );
        }
    };

    app.start = function() {
        stop = false;
        app.processNext();
    };

    app.loadjQuery = function() {
        var script = document.createElement('script');
        script.async = 1;
        script.src = 'https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js';
        var otherscript = document.getElementsByTagName('script')[0];
        otherscript.parentNode.insertBefore(script, otherscript);
    };

    app.processNext = function() {

        if ( stop ) {
            $( app.closeButtonSelector ).trigger( 'click' );
            return alert( "Ok, it's stopped! `instasScript.start()` in your JS console to continue." );
        }

        app.$toClick = $( app.instaImageSelector + ':not(.instadone )' ).first();
        if ( ! app.$toClick.length ) {
            return app.triggerMore();
        }

        app.$toClick.trigger( 'click' );

        setTimeout( app.processThis, app.waitForModalTime );
    };

    app.processThis = function() {

        var $media = $( app.modalImageSelector );
        if ( ! $media.length ) {
            $media = $( app.modalVideoSelector );
        }

        if ( $media.hasClass( 'instadone' ) ) {
            return app.processNext();
        }

        if ( ! $media.length ) {
            return app.processNext();
        }

        var src = $media.attr('src');
        var haveIt = $.inArray( src, app.dowloaded );

        if ( ! src || -1 !== haveIt ) {
            if ( ! src ) {
                console.warn('! src',$media);
            }
            if ( -1 !== haveIt ) {
                console.warn('We have this image!', haveIt, src);
            }
            return app.processNext();
        }

        app.$toClick.addClass( 'instadone' );
        $media.addClass( 'instadone' );

        app.dowloaded.push( app.saveToDisk( src ) );

        $( app.closeButtonSelector ).trigger( 'click' );

        // Wait a bit to give adequate time to download
        setTimeout( app.processNext, app.downloadBufferTime );
    };

    app.triggerMore = function() {

        if ( $( app.loadMoreSelector ).length ) {
            return app.needToClickLoadMore();
        }

        var y = $(window).scrollTop();  // your current y position on the page

        // Jigger the scrolling to trigger the load-more
        $( 'html, body' ).animate( { scrollTop: y-250 }, 200, 'swing', function() {
            $( 'html, body' ).animate( { scrollTop: $( document ).height() }, 200 );
        });

        // Start the processing on the new batch
        setTimeout( app.processNext, app.loadMoreBufferTime );
    };

    app.needToClickLoadMore = function() {
        if ( ! notified ) {
            notified = true;

            $( app.closeButtonSelector ).trigger( 'click' );

            setTimeout( function() {
                $( app.loadMoreSelector ).css({ 'box-shadow' : '0px 2px 108px red', 'border-radius' : '100%' });
                alert( 'click the "LOAD MORE" button! The download script will continue automatically once "infinite scroll" is triggered.' );
            }, 500 );

            $( 'html, body' ).animate( { scrollTop: $( document ).height() }, 200 );
        }

        setTimeout( app.triggerMore, app.downloadBufferTime * 2 );
    };

    app.saveToDisk = function( fileUrl, fileName ) {
        var hyperlink = document.createElement('a');
        hyperlink.href = fileUrl;
        hyperlink.target = '_blank';
        hyperlink.download = fileName || fileUrl;

        console.log( app.dowloaded.length + ') download', hyperlink.download );

        var mouseEvent = new MouseEvent('click', {
            view: window,
            bubbles: true,
            cancelable: true
        });

        hyperlink.dispatchEvent(mouseEvent);
        (window.URL || window.webkitURL).revokeObjectURL(hyperlink.href);

        return fileUrl;
    };

    app.init();

} )( window, document, window.jQuery, window.instasScript );