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/**
* Xibo - Digital Signage - http://www.xibo.org.uk
* Copyright (C) 2009-2017 Spring Signage Ltd
*
* This file is part of Xibo.
*
* Xibo is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* Xibo is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Xibo.  If not, see <http://www.gnu.org/licenses/>.
*/
jQuery.fn.extend({
    xiboTextRender: function(options, items) {
      
        // Default options
        var defaults = {
            "fx": "none",
            "duration": "50",
            "durationIsPerItem": false,
            "numItems": 0,
            "takeItemsFrom": "start",
            "itemsPerPage": 0,
            "speed": "2",
            "previewWidth": 0,
            "previewHeight": 0,
            "scaleOverride": 0,
            "randomiseItems": 0,
            "marqueeInlineSelector": ".item, .item p"
        };

options = $.extend({}, defaults, options);

// Calculate the dimensions of this item based on the preview/original dimensions
        var width = height = 0;
        if (options.previewWidth === 0 || options.previewHeight === 0) {
            width = options.originalWidth;
            height = options.originalHeight;
        }
        else {
            width = options.previewWidth;
            height = options.previewHeight;
        }

if (options.scaleOverride !== 0) {
            width = width / options.scaleOverride;
            height = height / options.scaleOverride;
        }

// For each matched element
        this.each(function() {

//console.log("[Xibo] Selected: " + this.tagName.toLowerCase());
            //console.log("[Xibo] Options: " + JSON.stringify(options));
            
            // 1st Objective - filter the items array we have been given
            // settings involved: 
            //  items, 
            //  numItems (ticker number of items from the start/end),
            //  takeItemsFrom (ticker sort or reverse sort the array)
            //  randomiseItems (randomise the items)
            if (options.randomiseItems === 1) {
                // Sort the items in a random order (considering the entire list)
                // Durstenfeld shuffle
                // https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle#The_modern_algorithm
                // https://stackoverflow.com/questions/2450954/how-to-randomize-shuffle-a-javascript-array
                for (var i = items.length - 1; i > 0; i--) {
                    var j = Math.floor(Math.random() * (i + 1));
                    var temp = items[i];
                    items[i] = items[j];
                    items[j] = temp;
                }
            }

if (options.takeItemsFrom === "end") {
                //console.log("[Xibo] Reversing items");
                items.reverse();
            }

// Make sure the num items is not greater than the actual number of items
            //console.log("[Xibo] Module requested " + options.numItems + " there are " + items.length + " in the array of items");

if (options.numItems > items.length || options.numItems === 0)
                options.numItems = items.length;

// Get a new array with only the first N elements
            items = items.slice(0, options.numItems);

// Reverse the items again (so they are in the correct order)
            if (options.takeItemsFrom === "end") {
                //console.log("[Xibo] Reversing items");
                items.reverse();
            }
                
            // 2nd objective - put the items on the page
            // settings involved:
            //  fx (if we are single we might need to configure some pages for this)
            //  itemsPerPage (tells us how many items to put on per page)
            //console.log("[Xibo] Putting " + options.numItems + " Items on the page");

// Store the number of items (we might change this to number of pages)
            var numberOfItems = options.numItems;

// How many pages to we need?
            var numberOfPages = (options.itemsPerPage > 0) ? Math.ceil(options.numItems / options.itemsPerPage) : options.numItems;
            var itemsThisPage = 1;

//console.log("[Xibo] We need to have " + numberOfPages + " pages");
            var appendTo = this;
            
            // Loop around each of the items we have been given and append them to this element (in a div)
            for (var i = 0; i < items.length; i++) {

// We don't add any pages for marquee / none transitions.
                if (options.fx != "none" &&
                    options.fx != "marqueeLeft" &&
                    options.fx != "marqueeRight" &&
                    options.fx != "marqueeUp" &&
                    options.fx != "marqueeDown") {

// If we need to set pages, have we switched over to a new page?
                    if (options.itemsPerPage > 1 && (itemsThisPage >= options.itemsPerPage || i === 0)) {
                        // Append a new page to the body
                        appendTo = $("<div/>").addClass("page").appendTo(this);

// Reset the row count on this page
                        itemsThisPage = 0;
                    }
                }

// For each item output a DIV
                $("<div/>")
                    .addClass("item")
                    .html(items[i]).appendTo(appendTo);

itemsThisPage++;
            }
            
            // 4th objective - move the items around, start the timer
            // settings involved:
            //  fx (the way we are moving effects the HTML required)
            //  speed (how fast we need to move)
            var marquee = false;

if (options.fx == "none") {
                // Do nothing
            }
            else if (options.fx != "marqueeLeft" && options.fx != "marqueeRight" && options.fx != "marqueeUp" && options.fx != "marqueeDown") {

// Make sure the speed is something sensible
                options.speed = (options.speed <= 200) ? 1000 : options.speed;

// Cycle slides are either page or item
                var slides = (options.itemsPerPage > 1) ? ".page" : ".item";

// If we only have 1 item, then we are in trouble and need to duplicate it.
                if ($(slides).length <= 1 && options.type == 'text') {
                    // Change our slide tag to be the paragraphs inside
                    slides = slides + ' p';

// Change the number of items
                    numberOfItems = $(slides).length;
                }

var numberOfSlides = (options.itemsPerPage > 1) ? numberOfPages : numberOfItems;
                var duration = (options.durationIsPerItem) ? options.duration : options.duration / numberOfSlides;

//console.log("[Xibo] initialising the cycle2 plugin with " + numberOfSlides + " slides and selector " + slides + ". Duration per slide is " + duration + " seconds.");

// Set the content div to the height of the original window
                $(this).css("height", height);

// Set the width on the cycled slides
                $(slides, this).css({
                    width: width,
                    height: height
                });

var timeout = duration * 1000;

if (options.fx !== "noTransition") {
                    timeout = timeout - (options.speed * 0.7);
                }

// Cycle handles this for us
                $(this).cycle({
                    fx: (options.fx === "noTransition") ? "none" : options.fx,
                    speed: (options.fx === "noTransition") ? 1 : options.speed,
                    timeout: timeout,
                    slides: "> " + slides
                });
            }
            else if (options.fx == "marqueeLeft" || options.fx == "marqueeRight") {
                marquee = true;
                options.direction = ((options.fx == "marqueeLeft") ? "left" : "right");

// Make sure the speed is something sensible
                options.speed = (options.speed == 0) ? 1 : options.speed;
                
                // Stack the articles up and move them across the screen
                $(options.marqueeInlineSelector, this).css({
                    display: "inline",
                    "padding-left": "10px"
                });
            }
            else if (options.fx == "marqueeUp" || options.fx == "marqueeDown") {
                // We want a marquee
                marquee = true;
                options.direction = ((options.fx == "marqueeUp") ? "up" : "down");

// Make sure the speed is something sensible
                options.speed = (options.speed == 0) ? 1 : options.speed;
            }

if (marquee) {
                // Create a DIV to scroll, and put this inside the body
                var scroller = $("<div/>")
                    .addClass("scroll")
                    .attr({
                        scrollamount: options.speed,
                        scaleFactor: options.scaleFactor,
                        behaviour: "scroll",
                        direction: options.direction,
                        height: height,
                        width: width
                    });

$(this).wrapInner(scroller);

// Set some options on the extra DIV and make it a marquee
                $(this).find('.scroll').marquee();

// Correct for up / down
                if (options.fx == "marqueeUp" || options.fx == "marqueeDown")
                    $(this).children().children().css({"white-space": "normal", float: "none"});
            }
            
            // Add aditional padding to the items
            if (paddingRight > 0 || paddingBottom > 0) {
                // Add padding to all item elements
                $(".item").css("padding", "0px " + paddingRight + "px " + paddingBottom  + "px 0px");
                
                // Exclude the last item on the page and the last on the content ( if there is no pages )
                $(".page .item:last-child").css("padding", 0);
                $("#content .item:last-child").css("padding", 0);
            }
        });

return $(this);
    }
});