//
//  marketplacesInject.js
//
//  Created by David Rowe on 12 Nov 2016.
//  Copyright 2016 High Fidelity, Inc.
//
//  Injected into marketplace Web pages.
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

(function () {

    // Event bridge messages.
    var CLARA_IO_DOWNLOAD = "CLARA.IO DOWNLOAD";
    var CLARA_IO_STATUS = "CLARA.IO STATUS";
    var CLARA_IO_CANCEL_DOWNLOAD = "CLARA.IO CANCEL DOWNLOAD";
    var CLARA_IO_CANCELLED_DOWNLOAD = "CLARA.IO CANCELLED DOWNLOAD";
    var GOTO_DIRECTORY = "GOTO_DIRECTORY";
    var QUERY_CAN_WRITE_ASSETS = "QUERY_CAN_WRITE_ASSETS";
    var CAN_WRITE_ASSETS = "CAN_WRITE_ASSETS";
    var WARN_USER_NO_PERMISSIONS = "WARN_USER_NO_PERMISSIONS";

    var canWriteAssets = false;
    var xmlHttpRequest = null;
    var isPreparing = false;  // Explicitly track download request status.

    var confirmAllPurchases = false; // Set this to "true" to cause Checkout.qml to popup for all items, even if free
    
    function injectCommonCode(isDirectoryPage) {

        // Supporting styles from marketplaces.css.
        // Glyph font family, size, and spacing adjusted because HiFi-Glyphs cannot be used cross-domain.
        $("head").append(
            '<style>' +
                '#marketplace-navigation { font-family: Arial, Helvetica, sans-serif; width: 100%; height: 50px; background: #00b4ef; position: fixed; bottom: 0; z-index: 1000; }' +
                '#marketplace-navigation .glyph { margin-left: 10px; margin-right: 3px; font-family: sans-serif; color: #fff; font-size: 24px; line-height: 50px; }' +
                '#marketplace-navigation .text { color: #fff; font-size: 16px; line-height: 50px; vertical-align: top; position: relative; top: 1px; }' +
                '#marketplace-navigation input#back-button { position: absolute; left: 20px; margin-top: 12px; padding-left: 0; padding-right: 5px; }' +
                '#marketplace-navigation input#all-markets { position: absolute; right: 20px; margin-top: 12px; padding-left: 15px; padding-right: 15px; }' +
                '#marketplace-navigation .right { position: absolute; right: 20px; }' +
            '</style>'
        );

        // Supporting styles from edit-style.css.
        // Font family, size, and position adjusted because Raleway-Bold cannot be used cross-domain.
        $("head").append(
            '<style>' +
                'input[type=button] { font-family: Arial, Helvetica, sans-serif; font-weight: bold; font-size: 12px; text-transform: uppercase; vertical-align: center; height: 28px; min-width: 100px; padding: 0 15px; border-radius: 5px; border: none; color: #fff; background-color: #000; background: linear-gradient(#343434 20%, #000 100%); cursor: pointer; }' +
                'input[type=button].white { color: #121212; background-color: #afafaf; background: linear-gradient(#fff 20%, #afafaf 100%); }' +
                'input[type=button].white:enabled:hover { background: linear-gradient(#fff, #fff); border: none; }' +
                'input[type=button].white:active { background: linear-gradient(#afafaf, #afafaf); }' +
            '</style>'
        );

        // Footer.
        var isInitialHiFiPage = location.href === "https://metaverse.highfidelity.com/marketplace?";
        $("body").append(
            '<div id="marketplace-navigation">' +
                (!isInitialHiFiPage ? '<input id="back-button" type="button" class="white" value="&lt; Back" />' : '') +
                (isInitialHiFiPage ? '<span class="glyph">&#x1f6c8;</span> <span class="text">Get items from Clara.io!</span>' : '') +
                (!isDirectoryPage ? '<input id="all-markets" type="button" class="white" value="See All Markets" />' : '') +
                (isDirectoryPage ? '<span class="right"><span class="glyph">&#x1f6c8;</span> <span class="text">Select a marketplace to explore.</span><span>' : '') +
            '</div>'
        );

        // Footer actions.
        $("#back-button").on("click", function () {
            (document.referrer !== "") ? window.history.back() : window.location = "https://metaverse.highfidelity.com/marketplace?";
        });
        $("#all-markets").on("click", function () {
            EventBridge.emitWebEvent(GOTO_DIRECTORY);
        });
    }

    function injectDirectoryCode() {

        // Remove e-mail hyperlink.
        var letUsKnow = $("#letUsKnow");
        letUsKnow.replaceWith(letUsKnow.html());

        // Add button links.

        $('#exploreClaraMarketplace').on('click', function () {
            window.location = "https://clara.io/library?gameCheck=true&public=true";
        });
        $('#exploreHifiMarketplace').on('click', function () {
            window.location = "http://www.highfidelity.com/marketplace";
        });
    }

    function addInventoryButton() {
        // Why isn't this an id?! This really shouldn't be a class on the website, but it is.
        var navbarBrandElement = document.getElementsByClassName('navbar-brand')[0];
        var inventoryElement = document.createElement('a');
        inventoryElement.classList.add("btn");
        inventoryElement.classList.add("btn-default");
        inventoryElement.id = "inventoryButton";
        inventoryElement.setAttribute('href', "#");
        inventoryElement.innerHTML = "INVENTORY";
        inventoryElement.style = "height:100%;margin-top:0;padding:15px 15px;";
        navbarBrandElement.parentNode.insertAdjacentElement('beforeend', inventoryElement);
        $('#inventoryButton').on('click', function () {
            EventBridge.emitWebEvent(JSON.stringify({
                type: "INVENTORY",
                referrerURL: window.location.href
            }));
        });
    }

    function buyButtonClicked(id, name, author, price, href) {
        EventBridge.emitWebEvent(JSON.stringify({
            type: "CHECKOUT",
            itemId: id,
            itemName: name,
            itemAuthor: author,
            itemPrice: price ? parseInt(price, 10) : 0,
            itemHref: href
        }));
    }

    function injectBuyButtonOnMainPage() {
        $('.grid-item').find('#price-or-edit').find('a').each(function() {
            $(this).attr('data-href', $(this).attr('href'));
            $(this).attr('href', '#');
            });
        $('.grid-item').find('#price-or-edit').find('.price').text("BUY");
        $('.grid-item').find('#price-or-edit').find('a').on('click', function () {
            buyButtonClicked($(this).closest('.grid-item').attr('data-item-id'),
                $(this).closest('.grid-item').find('.item-title').text(),
                $(this).closest('.grid-item').find('.creator').find('.value').text(),
                $(this).closest('.grid-item').find('.item-cost').text(),
                $(this).attr('data-href'));
        });
    }

    function injectHiFiCode() {
        if (confirmAllPurchases) {
            var target = document.getElementById('templated-items');
            // MutationObserver is necessary because the DOM is populated after the page is loaded.
            // We're searching for changes to the element whose ID is '#templated-items' - this is
            //     the element that gets filled in by the AJAX.
            var observer = new MutationObserver(function (mutations) {
                mutations.forEach(function (mutation) {
                    injectBuyButtonOnMainPage();
                });
                //observer.disconnect();
            });
            var config = { attributes: true, childList: true, characterData: true };
            observer.observe(target, config);

            // Try this here in case it works (it will if the user just pressed the "back" button,
            //     since that doesn't trigger another AJAX request.
            injectBuyButtonOnMainPage;
            addInventoryButton();
        }
    }

    function injectHiFiItemPageCode() {
        if (confirmAllPurchases) {
            var href = $('#side-info').find('.btn').attr('href');
            $('#side-info').find('.btn').attr('href', '#');
            $('#side-info').find('.btn').html('<span class="glyphicon glyphicon-download"></span>Buy Item  ');
            $('#side-info').find('.btn').on('click', function () {
                buyButtonClicked(window.location.pathname.split("/")[3],
                    $('#top-center').find('h1').text(),
                    $('#creator').find('.value').text(),
                    $('.item-cost').text(),
                    href);
            });
            addInventoryButton();
        }
    }

    function updateClaraCode() {
        // Have to repeatedly update Clara page because its content can change dynamically without location.href changing.

        // Clara library page.
        if (location.href.indexOf("clara.io/library") !== -1) {
            // Make entries navigate to "Image" view instead of default "Real Time" view.
            var elements = $("a.thumbnail");
            for (var i = 0, length = elements.length; i < length; i++) {
                var value = elements[i].getAttribute("href");
                if (value.slice(-6) !== "/image") {
                    elements[i].setAttribute("href", value + "/image");
                }
            }
        }

        // Clara item page.
        if (location.href.indexOf("clara.io/view/") !== -1) {
            // Make site navigation links retain gameCheck etc. parameters.
            var element = $("a[href^=\'/library\']")[0];
            var parameters = "?gameCheck=true&public=true";
            var href = element.getAttribute("href");
            if (href.slice(-parameters.length) !== parameters) {
                element.setAttribute("href", href + parameters);
            }

            // Remove unwanted buttons and replace download options with a single "Download to High Fidelity" button.
            var buttons = $("a.embed-button").parent("div");
            var downloadFBX;
            if (buttons.find("div.btn-group").length > 0) {
                buttons.children(".btn-primary, .btn-group , .embed-button").each(function () { this.remove(); });
                if ($("#hifi-download-container").length === 0) {  // Button hasn't been moved already.
                    downloadFBX = $('<a class="btn btn-primary"><i class=\'glyphicon glyphicon-download-alt\'></i> Download to High Fidelity</a>');
                    buttons.prepend(downloadFBX);
                    downloadFBX[0].addEventListener("click", startAutoDownload);
                }
            }

            // Move the "Download to High Fidelity" button to be more visible on tablet.
            if ($("#hifi-download-container").length === 0 && window.innerWidth < 700) {
                var downloadContainer = $('<div id="hifi-download-container"></div>');
                $(".top-title .col-sm-4").append(downloadContainer);
                downloadContainer.append(downloadFBX);
            }

            // Automatic download to High Fidelity.
            function startAutoDownload() {

                // One file request at a time.
                if (isPreparing) {
                    console.log("WARNING: Clara.io FBX: Prepare only one download at a time");
                    return;
                }

                // User must be able to write to Asset Server.
                if (!canWriteAssets) {
                    console.log("ERROR: Clara.io FBX: File download cancelled because no permissions to write to Asset Server");
                    EventBridge.emitWebEvent(WARN_USER_NO_PERMISSIONS);
                    return;
                }

                // User must be logged in.
                var loginButton = $("#topnav a[href='/signup']");
                if (loginButton.length > 0) {
                    loginButton[0].click();
                    return;
                }

                // Obtain zip file to download for requested asset.
                // Reference: https://clara.io/learn/sdk/api/export

                //var XMLHTTPREQUEST_URL = "https://clara.io/api/scenes/{uuid}/export/fbx?zip=true&centerScene=true&alignSceneGround=true&fbxUnit=Meter&fbxVersion=7&fbxEmbedTextures=true&imageFormat=WebGL";
                // 13 Jan 2017: Specify FBX version 5 and remove some options in order to make Clara.io site more likely to 
                // be successful in generating zip files.
                var XMLHTTPREQUEST_URL = "https://clara.io/api/scenes/{uuid}/export/fbx?fbxUnit=Meter&fbxVersion=5&fbxEmbedTextures=true&imageFormat=WebGL";

                var uuid = location.href.match(/\/view\/([a-z0-9\-]*)/)[1];
                var url = XMLHTTPREQUEST_URL.replace("{uuid}", uuid);

                xmlHttpRequest = new XMLHttpRequest();
                var responseTextIndex = 0;
                var zipFileURL = "";

                xmlHttpRequest.onreadystatechange = function () {
                    // Messages are appended to responseText; process the new ones.
                    var message = this.responseText.slice(responseTextIndex);
                    var statusMessage = "";

                    if (isPreparing) {  // Ignore messages in flight after finished/cancelled.
                        var lines = message.split(/[\n\r]+/);

                        for (var i = 0, length = lines.length; i < length; i++) {
                            if (lines[i].slice(0, 5) === "data:") {
                                // Parse line.
                                var data;
                                try {
                                    data = JSON.parse(lines[i].slice(5));
                                }
                                catch (e) {
                                    data = {};
                                }

                                // Extract status message.
                                if (data.hasOwnProperty("message") && data.message !== null) {
                                    statusMessage = data.message;
                                    console.log("Clara.io FBX: " + statusMessage);
                                }

                                // Extract zip file URL.
                                if (data.hasOwnProperty("files") && data.files.length > 0) {
                                    zipFileURL = data.files[0].url;
                                    if (zipFileURL.slice(-4) !== ".zip") {
                                        console.log(JSON.stringify(data));  // Data for debugging.
                                    }
                                }
                            }
                        }

                        if (statusMessage !== "") {
                            // Update the UI with the most recent status message.
                            EventBridge.emitWebEvent(CLARA_IO_STATUS + " " + statusMessage);
                        }
                    }

                    responseTextIndex = this.responseText.length;
                };

                // Note: onprogress doesn't have computable total length so can't use it to determine % complete.

                xmlHttpRequest.onload = function () {
                    var statusMessage = "";

                    if (!isPreparing) {
                        return;
                    }

                    isPreparing = false;

                    var HTTP_OK = 200;
                    if (this.status !== HTTP_OK) {
                        statusMessage = "Zip file request terminated with " + this.status + " " + this.statusText;
                        console.log("ERROR: Clara.io FBX: " + statusMessage);
                        EventBridge.emitWebEvent(CLARA_IO_STATUS + " " + statusMessage);
                    } else if (zipFileURL.slice(-4) !== ".zip") {
                        statusMessage = "Error creating zip file for download.";
                        console.log("ERROR: Clara.io FBX: " + statusMessage + ": " + zipFileURL);
                        EventBridge.emitWebEvent(CLARA_IO_STATUS + " " + statusMessage);
                    } else {
                        EventBridge.emitWebEvent(CLARA_IO_DOWNLOAD + " " + zipFileURL);
                        console.log("Clara.io FBX: File download initiated for " + zipFileURL);
                    }

                    xmlHttpRequest = null;
                }

                isPreparing = true;

                console.log("Clara.io FBX: Request zip file for " + uuid);
                EventBridge.emitWebEvent(CLARA_IO_STATUS + " Initiating download");

                xmlHttpRequest.open("POST", url, true);
                xmlHttpRequest.setRequestHeader("Accept", "text/event-stream");
                xmlHttpRequest.send();
            }
        }
    }

    function injectClaraCode() {

        // Make space for marketplaces footer in Clara pages.
        $("head").append(
            '<style>' +
                '#app { margin-bottom: 135px; }' +
                '.footer { bottom: 50px; }' +
            '</style>'
        );

        // Condense space.
        $("head").append(
            '<style>' +
                'div.page-title { line-height: 1.2; font-size: 13px; }' +
                'div.page-title-row { padding-bottom: 0; }' +
            '</style>'
        );

        // Move "Download to High Fidelity" button.
        $("head").append(
            '<style>' +
                '#hifi-download-container { position: absolute; top: 6px; right: 16px; }' +
            '</style>'
        );

        // Update code injected per page displayed.
        var updateClaraCodeInterval = undefined;
        updateClaraCode();
        updateClaraCodeInterval = setInterval(function () {
            updateClaraCode();
        }, 1000);

        window.addEventListener("unload", function () {
            clearInterval(updateClaraCodeInterval);
            updateClaraCodeInterval = undefined;
        });

        EventBridge.emitWebEvent(QUERY_CAN_WRITE_ASSETS);
    }

    function cancelClaraDownload() {
        isPreparing = false;

        if (xmlHttpRequest) {
            xmlHttpRequest.abort();
            xmlHttpRequest = null;
            console.log("Clara.io FBX: File download cancelled");
            EventBridge.emitWebEvent(CLARA_IO_CANCELLED_DOWNLOAD);
        }
    }

    function injectCode() {
        var DIRECTORY = 0;
        var HIFI = 1;
        var CLARA = 2;
        var HIFI_ITEM_PAGE = 3;
        var pageType = DIRECTORY;

        if (location.href.indexOf("highfidelity.com/") !== -1) { pageType = HIFI; }
        if (location.href.indexOf("clara.io/") !== -1) { pageType = CLARA; }
        if (location.href.indexOf("highfidelity.com/marketplace/items/") !== -1) { pageType = HIFI_ITEM_PAGE; }

        injectCommonCode(pageType === DIRECTORY);
        switch (pageType) {
            case DIRECTORY:
                injectDirectoryCode();
                break;
            case HIFI:
                injectHiFiCode();
                break;
            case CLARA:
                injectClaraCode();
                break;
            case HIFI_ITEM_PAGE:
                injectHiFiItemPageCode();
                break;

        }
    }

    function onLoad() {
        EventBridge.scriptEventReceived.connect(function (message) {
            if (message.slice(0, CAN_WRITE_ASSETS.length) === CAN_WRITE_ASSETS) {
                canWriteAssets = message.slice(-4) === "true";
            } else if (message.slice(0, CLARA_IO_CANCEL_DOWNLOAD.length) === CLARA_IO_CANCEL_DOWNLOAD) {
                cancelClaraDownload();
            } else {
                var parsedJsonMessage = JSON.parse(message);
                
                if (parsedJsonMessage.type === "marketplaces") {
                    if (parsedJsonMessage.action === "inspectionModeSetting") {
                        confirmAllPurchases = !!parsedJsonMessage.data;
                        injectCode();
                    }
                }
            }
        });

        // Request inspection mode setting
        // Code is injected into the webpage after the setting comes back.
        EventBridge.emitWebEvent(JSON.stringify({
            type: "REQUEST_SETTING"
        }));
    }

    // Load / unload.
    window.addEventListener("load", onLoad);  // More robust to Web site issues than using $(document).ready().
}());