// ==UserScript==
// @name     Show Subtitle/Audio Names for Plex
// @version  2.5
// @grant    none
// @include  http://plex/*
// @description Add the subtitle, video, audio track titles and media version info to the Plex Web app.
// @license  MIT; https://spdx.org/licenses/MIT.html#licenseText
// @namespace https://greasyfork.org/users/456605
// ==/UserScript==

function main () {
    function getMediaTitle(media) {
      	let parts = media.Part;
        for (let k = 0; k < parts.length; k++) {
            if (!parts[k].hasOwnProperty("Stream")) continue;
            let filePart = "";
            if (parts[k].hasOwnProperty("file")) filePart = parts[k].file + " | "
            let streams = parts[k].Stream;
            for (let l = 0; l < streams.length; l++) {
                if (streams[l].streamType == 1 && streams[l].hasOwnProperty("displayTitle")) {
                    const format = streams[l].displayTitle.match(".* \\((.*)\\)$");
                    if (format != null) return filePart + format[1] + " " + media.container;
                    else return filePart + media.container;
                }
            }
        }
        return "Unknown";
    }

    function intercept(url, responseText) {
        if (url.indexOf("/library/metadata/") == -1 && url.indexOf("/status/sessions") == -1) return responseText;
        let response = JSON.parse(responseText);
        if (!response.hasOwnProperty("MediaContainer") ||
            !response.MediaContainer.hasOwnProperty("Metadata")) return responseText;
        const meta = response.MediaContainer.Metadata;
        for (let i = 0; i < meta.length; i++) {
            if (!meta[i].hasOwnProperty("Media")) continue;
            let medias = meta[i].Media;
            for (let j = 0; j < medias.length; j++) {
                if (!medias[j].hasOwnProperty("Part")) continue;
                if (!medias[j].hasOwnProperty("title")) medias[j].title = getMediaTitle(medias[j]);
                let parts = medias[j].Part;
                for (let k = 0; k < parts.length; k++) {
                    if (!parts[k].hasOwnProperty("Stream")) continue;
                    let streams = parts[k].Stream;
                    for (let l = 0; l < streams.length; l++) {
                        if (!streams[l].hasOwnProperty("displayTitle") || !streams[l].hasOwnProperty("title")) continue;
                        streams[l].displayTitle = streams[l].displayTitle + " (" + streams[l].title + ")";
                    }
                }
            }
        }
        return JSON.stringify(response);
    }

    (function() {
        const oldXMLHttpRequest = XMLHttpRequest;
        XMLHttpRequest = new Proxy(XMLHttpRequest,
            {
                construct: function(target, args)
                {
                    //alert("constructor");
                    let made = new target(...args);

                    let proxiedCallback = made.onreadystatechange;
                    let _responseText = made.responseText;
                    made.onreadystatechange = (...readyArgs) =>
                    {
                        if (made.readyState == 4 && (made.responseType == '' || made.responseType == 'text')) {
                            try {
                                _responseText = intercept(made.responseURL, made.responseText);
                            } catch (err) {
                                console.error(err);
                            }
                        }
                        if (proxiedCallback) proxiedCallback.apply(made, readyArgs);
                    };

                    const processGet = function(val, target)
                    {
                        if (typeof val === 'function') return val.bind(target);
                        return val;
                    };
                    return new Proxy(made,
                        {
                            get: function(target, prop, receiver)
                            {
                                if (prop == "onreadystatechange")
                                {
                                    return processGet(proxiedCallback, target);
                                }
                                if (prop == "responseText")
                                {
                                    return _responseText;
                                }
                                return processGet(target[prop], target);
                            },
                            set: function(target, prop, value, receiver)
                            {
                                if (prop == "onreadystatechange")
                                {
                                    proxiedCallback = value;
                                    return true;
                                }
                                target[prop] = value;
                                return true;
                            }
                        }
                    );
                }
            }
        );
    })();
}

// From https://stackoverflow.com/questions/2303147/
var script = document.createElement('script');
script.appendChild(document.createTextNode('('+ main +')();\n//# sourceURL=injectPlex.js'));
(document.body || document.head || document.documentElement).appendChild(script);