'use strict';

// Constants
const DEVICE_ID = '031_04'; // Found in the APK as the resource @string/device_id. (Default: "001")
const BRAND_ID = '011'; // Selected from the function mapBrandCode(), which is found in embed.min.js (a script loaded by the website). (Default: "004")

// Lock the reported app name and version to a known working value. (The reported app name and version can determine the video stream format.)
const APP_NAME = 'webplayer-dc';
const APP_VERSION = '1.2.7.49';

// Target File
const TARGET_FILE = 'playmanifest_secure.json';

// Patch XMLHttpRequest.open
const oldOpen = XMLHttpRequest.prototype.open;
Object.defineProperty(XMLHttpRequest.prototype, 'open', {
    value: function (method, url, ...args) {
        // Flag
        this._isTargetUrl = (new URL(url)).pathname.endsWith('/' + TARGET_FILE);

        // Call Original Method
        oldOpen.call(this, method, url, ...args);
    },
    enumerable: false,
    configurable: false,
    writable: false
});

// Patch XMLHttpRequest.setRequestHeader
const oldSetRequestHeader = XMLHttpRequest.prototype.setRequestHeader;
Object.defineProperty(XMLHttpRequest.prototype, 'setRequestHeader', {
    value: function (name, value) {
        // Lock App Version
        if (this._isTargetUrl && name.toLowerCase() === 'appversion') {
            value = APP_VERSION;
        }

        // Call Original Method
        oldSetRequestHeader.call(this, name, value);
    },
    enumerable: false,
    configurable: false,
    writable: false
});

// Add resolution info to video player.
function addResolutionInfo(player) {
    // Remove existing <p> element (if possible).
    const id = '__disneynow_resolution_info__';
    let p = document.getElementById(id);
    if (p) {
        p.remove();
    }

    // Create <p> element
    p = document.createElement('P');
    p.id = id;

    // Add <p> element to DOM.
    player.parentElement.insertBefore(p, player);

    // Set initial resolution text.
    function setResolutionText(resolution) {
        p.innerText = `Video Quality: ${resolution}`;
    }
    setResolutionText('N/A');

    // Hook into <video> element.
    const video = player.getElementsByTagName('VIDEO')[0];
    video.addEventListener("resize", e => setResolutionText(`${e.target.videoWidth}x${e.target.videoHeight}`), false);
}

// Patch XMLHttpRequest.send
const oldSend = XMLHttpRequest.prototype.send;
Object.defineProperty(XMLHttpRequest.prototype, 'send', {
    value: function (body, ...args) {
        // Check
        if (this._isTargetUrl && body) {
            // Parse Request Body
            const params = new URLSearchParams(body);

            // Pretend to be an Android device.
            params.set('device', DEVICE_ID);
            // Switch brand ID to one without ads.
            params.set('brand', BRAND_ID);
            // Set recommended video player size to current screen resolution.
            params.set('vps', `${window.screen.width * window.devicePixelRatio}x${window.screen.height * window.devicePixelRatio}`);
            // Ensure other miscellaneous parameters are correct.
            params.set('hdcp_level', '2.3');
            params.set('hlsver', '6');
            params.set('app_name', APP_NAME);

            // Apply Patch
            body = params.toString();

            // Log Video Stream URL
            this.addEventListener("load", function () {
                const obj = JSON.parse(this.responseText);
                const video = obj.video ? obj.video : obj.channels.channel[0];
                const assetUrl = new URL(video.assets.asset[0].value);
                console.log('Video Stream URL: ' + assetUrl);
            });

            // Find video player and add resolution info.
            const player = document.getElementsByClassName('VideoPlayer')[0];
            addResolutionInfo(player);
        }

        // Call Original Method
        oldSend.call(this, body, ...args);
    },
    enumerable: false,
    configurable: false,
    writable: false
});