var onYouTubeIframeAPIReady = undefined;

odoo.define('website_slides.fullscreen', function (require) {
    'use strict';

    var publicWidget = require('web.public.widget');
    var core = require('web.core');
    var config = require('web.config');
    var QWeb = core.qweb;
    var _t = core._t;

    var session = require('web.session');

    var Quiz = require('website_slides.quiz').Quiz;

    var Dialog = require('web.Dialog');

    require('website_slides.course.join.widget');

    /**
     * Helper: Get the slide dict matching the given criteria
     *
     * @private
     * @param {Array<Object>} slideList List of dict reprensenting a slide
     * @param {Object} matcher (see https://underscorejs.org/#matcher)
     */
    var findSlide = function (slideList, matcher) {
        var slideMatch = _.matcher(matcher);
        return _.find(slideList, slideMatch);
    };

    /**
     * This widget is responsible of display Youtube Player
     *
     * The widget will trigger an event `change_slide` when the video is at
     * its end, and `slide_completed` when the player is at 30 sec before the
     * end of the video (30 sec before is considered as completed).
     */
    var VideoPlayer = publicWidget.Widget.extend({
        template: 'website.slides.fullscreen.video',
        youtubeUrl: 'https://www.youtube.com/iframe_api',

        init: function (parent, slide) {
            this.slide = slide;
            return this._super.apply(this, arguments);
        },
        start: function (){
            var self = this;
            return Promise.all([this._super.apply(this, arguments), this._loadYoutubeAPI()]).then(function() {
                self._setupYoutubePlayer();
            });
        },
        _loadYoutubeAPI: function () {
            var self = this;
            var prom = new Promise(function (resolve, reject) {
                if ($(document).find('script[src="' + self.youtubeUrl + '"]').length === 0) {
                    var $youtubeElement = $('<script/>', {src: self.youtubeUrl});
                    $(document.head).append($youtubeElement);

                    // function called when the Youtube asset is loaded
                    // see https://developers.google.com/youtube/iframe_api_reference#Requirements
                    onYouTubeIframeAPIReady = function () {
                        resolve();
                    };
                } else {
                    resolve();
                }
            });
            return prom;
        },
        /**
         * Links the youtube api to the iframe present in the template
         *
         * @private
         */
        _setupYoutubePlayer: function (){
            this.player = new YT.Player('youtube-player' + this.slide.id, {
                playerVars: {
                    'autoplay': 1,
                    'origin': window.location.origin
                },
                events: {
                    'onStateChange': this._onPlayerStateChange.bind(this)
                }
            });
        },
        /**
         * Specific method of the youtube api.
         * Whenever the player starts playing/pausing/buffering/..., a setinterval is created.
         * This setinterval is used to check te user's progress in the video.
         * Once the user reaches a particular time in the video (30s before end), the slide will be considered as completed
         * if the video doesn't have a mini-quiz.
         * This method also allows to automatically go to the next slide (or the quiz associated to the current
         * video) once the video is over
         *
         * @private
         * @param {*} event
         */
        _onPlayerStateChange: function (event){
            var self = this;

            if (self.slide.completed) {
                return;
            }

            if (event.data !== YT.PlayerState.ENDED) {
                if (!event.target.getCurrentTime) {
                    return;
                }

                if (self.tid) {
                    clearInterval(self.tid);
                }

                self.currentVideoTime = event.target.getCurrentTime();
                self.totalVideoTime = event.target.getDuration();
                self.tid = setInterval(function (){
                    self.currentVideoTime += 1;
                    if (self.totalVideoTime && self.currentVideoTime > self.totalVideoTime - 30){
                        clearInterval(self.tid);
                        if (!self.slide.hasQuestion && !self.slide.completed){
                            self.trigger_up('slide_to_complete', self.slide);
                        }
                    }
                }, 1000);
            } else {
                if (self.tid) {
                    clearInterval(self.tid);
                }
                this.player = undefined;
                if (this.slide.hasNext) {
                    this.trigger_up('slide_go_next');
                }
            }
        },
    });


    /**
     * This widget is responsible of navigation for one slide to another:
     *  - by clicking on any slide list entry
     *  - by mouse click (next / prev)
     *  - by recieving the order to go to prev/next slide (`goPrevious` and `goNext` public methods)
     *
     * The widget will trigger an event `change_slide` with
     * the `slideId` and `isMiniQuiz` as data.
     */
    var Sidebar = publicWidget.Widget.extend({
        events: {
            "click .o_wslides_fs_sidebar_list_item": '_onClickTab',
        },
        init: function (parent, slideList, defaultSlide) {
            var result = this._super.apply(this, arguments);
            this.slideEntries = slideList;
            this.set('slideEntry', defaultSlide);
            return result;
        },
        start: function (){
            var self = this;
            this.on('change:slideEntry', this, this._onChangeCurrentSlide);
            return this._super.apply(this, arguments).then(function (){
                $(document).keydown(self._onKeyDown.bind(self));
            });
        },
        destroy: function () {
            $(document).unbind('keydown', this._onKeyDown.bind(this));
            return this._super.apply(this, arguments);
        },
        //--------------------------------------------------------------------------
        // Public
        //--------------------------------------------------------------------------
        /**
         * Change the current slide with the next one (if there is one).
         *
         * @public
         */
        goNext: function () {
            var currentIndex = this._getCurrentIndex();
            if (currentIndex < this.slideEntries.length-1) {
                this.set('slideEntry', this.slideEntries[currentIndex+1]);
            }
        },
        /**
         * Change the current slide with the previous one (if there is one).
         *
         * @public
         */
        goPrevious: function () {
            var currentIndex = this._getCurrentIndex();
            if (currentIndex >= 1) {
                this.set('slideEntry', this.slideEntries[currentIndex-1]);
            }
        },
        /**
         * Greens up the bullet when the slide is completed
         *
         * @public
         * @param {Integer} slideId
         */
        setSlideCompleted: function (slideId) {
            var $elem = this.$('.fa-circle-thin[data-slide-id="'+slideId+'"]');
            $elem.removeClass('fa-circle-thin').addClass('fa-check text-success o_wslides_slide_completed');
        },
        /**
         * Updates the progressbar whenever a lesson is completed
         *
         * @public
         * @param {*} channelCompletion
         */
        updateProgressbar: function (channelCompletion) {
            var completion = Math.min(100, channelCompletion);
            this.$('.progress-bar').css('width', completion + "%" );
            this.$('.o_wslides_progress_percentage').text(completion);
        },

        //--------------------------------------------------------------------------
        // Private
        //--------------------------------------------------------------------------
        /**
         * Get the index of the current slide entry (slide and/or quiz)
         */
        _getCurrentIndex: function () {
            var slide = this.get('slideEntry');
            var currentIndex = _.findIndex(this.slideEntries, function (entry) {
                return entry.id === slide.id && entry.isQuiz === slide.isQuiz;
            });
            return currentIndex;
        },
        //--------------------------------------------------------------------------
        // Handler
        //--------------------------------------------------------------------------
        /**
         * Handler called whenever the user clicks on a sub-quiz which is linked to a slide.
         * This does NOT handle the case of a slide of type "quiz".
         * By going through this handler, the widget will be able to determine that it has to render
         * the associated quiz and not the main content.
         *
         * @private
         * @param {*} ev
         */
        _onClickMiniQuiz: function (ev){
            var slideID = parseInt($(ev.currentTarget).data().slide_id);
            this.set('slideEntry',{
                slideID: slideID,
                isMiniQuiz: true
            });
            this.trigger_up('change_slide', this.get('slideEntry'));
        },
        /**
         * Handler called when the user clicks on a normal slide tab
         *
         * @private
         * @param {*} ev
         */
        _onClickTab: function (ev) {
            ev.stopPropagation();
            var $elem = $(ev.currentTarget);
            if ($elem.data('canAccess') === 'True') {
                var isQuiz = $elem.data('isQuiz');
                var slideID = parseInt($elem.data('id'));
                var slide = findSlide(this.slideEntries, {id: slideID, isQuiz: isQuiz});
                this.set('slideEntry', slide);
            }
        },
        /**
         * Actively changes the active tab in the sidebar so that it corresponds
         * the slide currently displayed
         *
         * @private
         */
        _onChangeCurrentSlide: function () {
            var slide = this.get('slideEntry');
            this.$('.o_wslides_fs_sidebar_list_item.active').removeClass('active');
            var selector = '.o_wslides_fs_sidebar_list_item[data-id='+slide.id+'][data-is-quiz!="1"]';

            this.$(selector).addClass('active');
            this.trigger_up('change_slide', this.get('slideEntry'));
        },

        /**
         * Binds left and right arrow to allow the user to navigate between slides
         *
         * @param {*} ev
         * @private
         */
        _onKeyDown: function (ev){
            switch (ev.key){
                case "ArrowLeft":
                    this.goPrevious();
                    break;
                case "ArrowRight":
                    this.goNext();
                    break;
            }
        },
    });

    var ShareDialog = Dialog.extend({
        template: 'website.slide.share.modal',
        events: {
            'click .o_wslides_js_share_email button': '_onShareByEmailClick',
            'click a.o_wslides_js_social_share': '_onSlidesSocialShare',
            'click .o_clipboard_button': '_onShareLinkCopy',
        },

        init: function (parent, options, slide) {
            options = _.defaults(options || {}, {
                title: "Share",
                buttons: [{text: "Cancel", close: true}],
                size: 'medium',
            });
            this._super(parent, options);
            this.slide = slide;
            this.session = session;
        },

        _onShareByEmailClick: function() {
            var form = this.$('.o_wslides_js_share_email');
            var input = form.find('input');
            var slideID = form.find('button').data('slide-id');
            if (input.val() && input[0].checkValidity()) {
                form.removeClass('o_has_error').find('.form-control, .custom-select').removeClass('is-invalid');
                this._rpc({
                    route: '/slides/slide/send_share_email',
                    params: {
                        slide_id: slideID,
                        email: input.val(),
                        fullscreen: true
                    },
                }).then(function () {
                    form.html('<div class="alert alert-info" role="alert">' + _t('<strong>Thank you!</strong> Mail has been sent.') + '</div>');
                });
            } else {
                form.addClass('o_has_error').find('.form-control, .custom-select').addClass('is-invalid');
                input.focus();
            }
        },

        _onSlidesSocialShare: function (ev) {
            ev.preventDefault();
            var popUpURL = $(ev.currentTarget).attr('href');
            window.open(popUpURL, 'Share Dialog', 'width=626,height=436');
        },

        _onShareLinkCopy: function (ev) {
            ev.preventDefault();
            var $clipboardBtn = this.$('.o_clipboard_button');
            $clipboardBtn.tooltip({title: "Copied !", trigger: "manual", placement: "bottom"});
            var self = this;
            var clipboard = new ClipboardJS('.o_clipboard_button', {
                target: function () {
                    return self.$('.o_wslides_js_share_link')[0];
                },
                container: this.el
            });
            clipboard.on('success', function () {
                clipboard.destroy();
                $clipboardBtn.tooltip('show');
                _.delay(function () {
                    $clipboardBtn.tooltip("hide");
                }, 800);
            });
            clipboard.on('error', function (e) {
                clipboard.destroy();
            })
        },

    });

    var ShareButton = publicWidget.Widget.extend({
        events: {
            "click .o_wslides_fs_share": '_onClickShareSlide'
        },

        init: function (el, slide) {
            var result = this._super.apply(this, arguments);
            this.slide = slide;
            return result;
        },

        _openDialog: function() {
            return new ShareDialog(this, {}, this.slide).open();
        },

        _onClickShareSlide: function (ev) {
            ev.preventDefault();
            this._openDialog();
        },

        _onChangeSlide: function (currentSlide) {
            this.slide = currentSlide;
        }

    });

    /**
     * This widget's purpose is to show content of a course, naviguating through contents
     * and correclty display it. It also handle slide completion, course progress, ...
     *
     * This widget is rendered sever side, and attached to the existing DOM.
     */
    var Fullscreen = publicWidget.Widget.extend({
        events: {
            "click .o_wslides_fs_toggle_sidebar": '_onClickToggleSidebar',
        },
        custom_events: {
            'change_slide': '_onChangeSlideRequest',
            'slide_to_complete': '_onSlideToComplete',
            'slide_completed': '_onSlideCompleted',
            'slide_go_next': '_onSlideGoToNext',
        },
        /**
        * @override
        * @param {Object} el
        * @param {Object} slides Contains the list of all slides of the course
        * @param {integer} defaultSlideId Contains the ID of the slide requested by the user
        */
        init: function (parent, slides, defaultSlideId, channelData){
            var result = this._super.apply(this,arguments);
            this.initialSlideID = defaultSlideId;
            this.slides = this._preprocessSlideData(slides);
            this.channel = channelData;
            var slide;
            var urlParams = $.deparam.querystring();
            if (defaultSlideId) {
                slide = findSlide(this.slides, {id: defaultSlideId, isQuiz: urlParams.quiz === "1" });
            } else {
                slide = this.slides[0];
            }

            this.set('slide', slide);

            this.sidebar = new Sidebar(this, this.slides, slide);
            this.shareButton = new ShareButton(this, slide);
            return result;
        },
        /**
         * @override
         */
        start: function (){
            var self = this;
            this.on('change:slide', this, this._onChangeSlide);
            this._toggleSidebar();
            return this._super.apply(this, arguments).then(function () {
                return self._onChangeSlide(); // trigger manually once DOM ready, since slide content is not rendered server side
            });
        },
        /**
         * Extended to attach sub widget to sub DOM. This might be experimental but
         * seems working fine.
         *
         * @override
         */
        attachTo: function (){
            var defs = [this._super.apply(this, arguments)];
            defs.push(this.sidebar.attachTo(this.$('.o_wslides_fs_sidebar')));
            defs.push(this.shareButton.attachTo(this.$('.o_wslides_slide_fs_header')));
            return $.when.apply($, defs);
        },
        //--------------------------------------------------------------------------
        // Private
        //--------------------------------------------------------------------------
        /**
         * Fetches content with an rpc call for slides of type "webpage"
         *
         * @private
         */
        _fetchHtmlContent: function (){
            var self = this;
            var currentSlide = this.get('slide');
            return self._rpc({
                route:"/slides/slide/get_html_content",
                params: {
                    'slide_id': currentSlide.id
                }
            }).then(function (data){
                if (data.html_content) {
                    currentSlide.htmlContent = data.html_content;
                }
            });
        },
        /**
        * Fetches slide content depending on its type.
        * If the slide doesn't need to fetch any content, return a resolved deferred
        *
        * @private
        */
        _fetchSlideContent: function (){
            var slide = this.get('slide');
            if (slide.type === 'webpage' && !slide.isQuiz) {
                return this._fetchHtmlContent();
            }
            return Promise.resolve();
        },
        _markAsCompleted: function (slideId, completion) {
            var slide = findSlide(this.slides, {id: slideId});
            slide.completed = true;
            this.sidebar.setSlideCompleted(slide.id);
            this.sidebar.updateProgressbar(completion);
        },
        /**
         * Extend the slide data list to add informations about rendering method, and other
         * specific values according to their slide_type.
         */
        _preprocessSlideData: function (slidesDataList) {
            slidesDataList.forEach(function (slideData, index) {
                // compute hasNext slide
                slideData.hasNext = index < slidesDataList.length-1;
                // compute embed url
                if (slideData.type === 'video') {
                    slideData.embedCode = $(slideData.embedCode).attr('src') || ""; // embedCode contains an iframe tag, where src attribute is the url (youtube or embed document from odoo)
                    var separator = slideData.embedCode.indexOf("?") !== -1 ? "&" : "?";
                    var scheme = slideData.embedCode.indexOf('//') === 0 ? 'https:' : '';
                    var params = { rel: 0, enablejsapi: 1, origin: window.location.origin };
                    if (slideData.embedCode.indexOf("//drive.google.com") === -1) {
                        params.autoplay = 1;
                    }
                    slideData.embedUrl = slideData.embedCode ? scheme + slideData.embedCode + separator + $.param(params) : "";
                } else if (slideData.type === 'infographic') {
                    slideData.embedUrl = _.str.sprintf('/web/image/slide.slide/%s/image_1024', slideData.id);
                } else if (_.contains(['document', 'presentation'], slideData.type)) {
                    slideData.embedUrl = $(slideData.embedCode).attr('src');
                }
                // fill empty property to allow searching on it with _.filter(list, matcher)
                slideData.isQuiz = !!slideData.isQuiz;
                slideData.hasQuestion = !!slideData.hasQuestion;
                // technical settings for the Fullscreen to work
                slideData._autoSetDone = _.contains(['infographic', 'presentation', 'document', 'webpage'], slideData.type) && !slideData.hasQuestion;
            });
            return slidesDataList;
        },
        /**
         * Changes the url whenever the user changes slides.
         * This allows the user to refresh the page and stay on the right slide
         *
         * @private
         */
        _pushUrlState: function (){
            var urlParts = window.location.pathname.split('/');
            urlParts[urlParts.length-1] = this.get('slide').slug;
            var url =  urlParts.join('/');
            this.$('.o_wslides_fs_exit_fullscreen').attr('href', url);
            var params = {'fullscreen': 1 };
            if (this.get('slide').isQuiz){
                params.quiz = 1;
            }
            var fullscreenUrl = _.str.sprintf('%s?%s', url, $.param(params));
            history.pushState(null, '', fullscreenUrl);
        },
        /**
         * Render the current slide content using specific mecanism according to slide type:
         * - simply append content (for webpage)
         * - template rendering (for image, document, ....)
         * - using a sub widget (quiz and video)
         *
         * @private
         * @returns Deferred
         */
        _renderSlide: function () {
            var slide = this.get('slide');
            var $content = this.$('.o_wslides_fs_content');
            $content.empty();

            // display quiz slide, or quiz attached to a slide
            if (slide.type === 'quiz' || slide.isQuiz) {
                $content.addClass('bg-white');
                var QuizWidget = new Quiz(this, slide, this.channel);
                return QuizWidget.appendTo($content);
            }

            // render slide content
            if (_.contains(['document', 'presentation', 'infographic'], slide.type)) {
                $content.html(QWeb.render('website.slides.fullscreen.content', {widget: this}));
            } else if (slide.type === 'video') {
                this.videoPlayer = new VideoPlayer(this, slide);
                return this.videoPlayer.appendTo($content);
            } else if (slide.type === 'webpage'){
                var $wpContainer = $('<div>').addClass('o_wslide_fs_webpage_content bg-white block w-100 overflow-auto');
                $(slide.htmlContent).appendTo($wpContainer);
                $content.append($wpContainer);
                this.trigger_up('widgets_start_request', {
                    $target: $content,
                });
            }
            return Promise.resolve();
        },
        /**
         * Once the completion conditions are filled,
         * rpc call to set the the relation between the slide and the user as "completed"
         *
         * @private
         * @param {Integer} slideId: the id of slide to set as completed
         */
        _setCompleted: function (slideId){
            var self = this;
            var slide = findSlide(this.slides, {id: slideId});
            if (!slide.completed) {  // no useless RPC call
                return this._rpc({
                    route: '/slides/slide/set_completed',
                    params: {
                        slide_id: slide.id,
                    }
                }).then(function (data){
                    self._markAsCompleted(slideId, data.channel_completion);
                    return Promise.resolve();
                });
            }
            return Promise.resolve();
        },
        //--------------------------------------------------------------------------
        // Handlers
        //--------------------------------------------------------------------------
        /**
         * Triggered whenever the user changes slides.
         * When the current slide is changed, widget will be automatically updated
         * and allowed to: fetch the content if needed, render it, update the url,
         * and set slide as "completed" according to its type requirements. In
         * mobile case (i.e. limited screensize), sidebar will be toggled since 
         * sidebar will block most or all of new slide visibility.
         *
         * @private
         */
        _onChangeSlide: function () {
            var self = this;
            var slide = this.get('slide');
            self._pushUrlState();
            return this._fetchSlideContent().then(function() { // render content
                var websiteName = document.title.split(" | ")[1]; // get the website name from title
                document.title =  (websiteName) ? slide.name + ' | ' + websiteName : slide.name;
                if  (config.device.size_class < config.device.SIZES.MD) {
                    self._toggleSidebar(); // hide sidebar when small device screen
                }
                return self._renderSlide();
            }).then(function() {
                if (slide._autoSetDone && !session.is_website_user) {  // no useless RPC call
                    if (['document', 'presentation'].includes(slide.type)) {
                        // only set the slide as completed after iFrame is loaded to avoid concurrent execution with 'embedUrl' controller
                        self.el.querySelector('iframe.o_wslides_iframe_viewer').addEventListener('load', () => self._setCompleted(slide.id));
                    } else {
                           return self._setCompleted(slide.id);
                    }
                }
            });
        },
        /**
         * Changes current slide when receiving custom event `change_slide` with
         * its id and if it's its quizz or not we need to display.
         *
         * @private
         */
        _onChangeSlideRequest: function (ev){
            var slideData = ev.data;
            var newSlide = findSlide(this.slides, {
                id: slideData.id,
                isQuiz: slideData.isQuiz || false,
            });
            this.set('slide', newSlide);
            this.shareButton._onChangeSlide(newSlide);
        },
        /**
         * Triggered when subwidget has mark the slide as done, and the UI need to be adapted.
         *
         * @private
         */
        _onSlideCompleted: function (ev) {
            var slide = ev.data.slide;
            var completion = ev.data.completion;
            this._markAsCompleted(slide.id, completion);
        },
        /**
         * Triggered when sub widget business is done and that slide
         * can now be marked as done.
         *
         * @private
         */
        _onSlideToComplete: function (ev) {
            if (!session.is_website_user) {  // no useless RPC call
                var slideId = ev.data.id;
                this._setCompleted(slideId);
            }
        },
        /**
         * Go the next slide
         *
         * @private
         */
        _onSlideGoToNext: function (ev) {
            this.sidebar.goNext();
        },
        /**
         * Called when the sidebar toggle is clicked -> toggles the sidebar visibility.
         *
         * @private
         */
        _onClickToggleSidebar: function (ev){
            ev.preventDefault();
            this._toggleSidebar();
        },
        /**
         * Toggles sidebar visibility.
         *
         * @private
         */
        _toggleSidebar: function () {
            this.$('.o_wslides_fs_sidebar').toggleClass('o_wslides_fs_sidebar_hidden');
            this.$('.o_wslides_fs_toggle_sidebar').toggleClass('active');
        },
    });

    publicWidget.registry.websiteSlidesFullscreenPlayer = publicWidget.Widget.extend({
        selector: '.o_wslides_fs_main',
        xmlDependencies: ['/website_slides/static/src/xml/website_slides_fullscreen.xml', '/website_slides/static/src/xml/website_slides_share.xml'],
        start: function (){
            var self = this;
            var proms = [this._super.apply(this, arguments)];
            var fullscreen = new Fullscreen(this, this._getSlides(), this._getCurrentSlideID(), this._extractChannelData());
            proms.push(fullscreen.attachTo(".o_wslides_fs_main"));
            return Promise.all(proms).then(function () {
                $('#edit-page-menu a[data-action="edit"]').on('click', self._onWebEditorClick.bind(self));
            });
        },

        /**
         * The web editor does not work well with the e-learning fullscreen view.
         * It actually completely closes the fullscreen view and opens the edition on a blank page.
         *
         * To avoid this, we intercept the click on the 'edit' button and redirect to the
         * non-fullscreen view of this slide with the editor enabled, which is more suited to edit
         * in-place anyway.
         *
         * @param {MouseEvent} e
         */
        _onWebEditorClick: function (e) {
            e.preventDefault();
            e.stopPropagation();

            window.location = `${window.location.pathname}?fullscreen=0&enable_editor=1`;
        },

        _extractChannelData: function (){
            return this.$el.data();
        },
        _getCurrentSlideID: function (){
            return parseInt(this.$('.o_wslides_fs_sidebar_list_item.active').data('id'));
        },
        /**
         * @private
         * Creates slides objects from every slide-list-cells attributes
         */
        _getSlides: function (){
            var $slides = this.$('.o_wslides_fs_sidebar_list_item[data-can-access="True"]');
            var slideList = [];
            $slides.each(function () {
                var slideData = $(this).data();
                slideList.push(slideData);
            });
            return slideList;
        },
    });

    return Fullscreen;
});