"use strict";
const vm = require("vm");
const webIDLConversions = require("webidl-conversions");
const { CSSStyleDeclaration } = require("cssstyle");
const { Performance: RawPerformance } = require("w3c-hr-time");
const notImplemented = require("./not-implemented");
const { installInterfaces } = require("../living/interfaces");
const { define, mixin } = require("../utils");
const Element = require("../living/generated/Element");
const EventTarget = require("../living/generated/EventTarget");
const PageTransitionEvent = require("../living/generated/PageTransitionEvent");
const namedPropertiesWindow = require("../living/named-properties-window");
const postMessage = require("../living/post-message");
const DOMException = require("domexception/webidl2js-wrapper");
const { btoa, atob } = require("abab");
const idlUtils = require("../living/generated/utils");
const WebSocketImpl = require("../living/websockets/WebSocket-impl").implementation;
const BarProp = require("../living/generated/BarProp");
const documents = require("../living/documents.js");
const External = require("../living/generated/External");
const Navigator = require("../living/generated/Navigator");
const Performance = require("../living/generated/Performance");
const Screen = require("../living/generated/Screen");
const Storage = require("../living/generated/Storage");
const Selection = require("../living/generated/Selection");
const reportException = require("../living/helpers/runtime-script-errors");
const { fireAnEvent } = require("../living/helpers/events");
const SessionHistory = require("../living/window/SessionHistory");
const { forEachMatchingSheetRuleOfElement, getResolvedValue, propertiesWithResolvedValueImplemented,
  SHADOW_DOM_PSEUDO_REGEXP } = require("../living/helpers/style-rules.js");
const CustomElementRegistry = require("../living/generated/CustomElementRegistry");
const jsGlobals = require("./js-globals.json");

const GlobalEventHandlersImpl = require("../living/nodes/GlobalEventHandlers-impl").implementation;
const WindowEventHandlersImpl = require("../living/nodes/WindowEventHandlers-impl").implementation;

exports.createWindow = function (options) {
  return new Window(options);
};

const jsGlobalEntriesToInstall = Object.entries(jsGlobals).filter(([name]) => name in global);

// https://html.spec.whatwg.org/#the-window-object
function setupWindow(windowInstance, { runScripts }) {
  if (runScripts === "outside-only" || runScripts === "dangerously") {
    contextifyWindow(windowInstance);

    // Without this, these globals will only appear to scripts running inside the context using vm.runScript; they will
    // not appear to scripts running from the outside, including to JSDOM implementation code.
    for (const [globalName, globalPropDesc] of jsGlobalEntriesToInstall) {
      const propDesc = { ...globalPropDesc, value: vm.runInContext(globalName, windowInstance) };
      Object.defineProperty(windowInstance, globalName, propDesc);
    }
  } else {
    // Without contextifying the window, none of the globals will exist. So, let's at least alias them from the Node.js
    // context. See https://github.com/jsdom/jsdom/issues/2727 for more background and discussion.
    for (const [globalName, globalPropDesc] of jsGlobalEntriesToInstall) {
      const propDesc = { ...globalPropDesc, value: global[globalName] };
      Object.defineProperty(windowInstance, globalName, propDesc);
    }
  }

  installInterfaces(windowInstance, ["Window"]);

  const EventTargetConstructor = windowInstance.EventTarget;

  // eslint-disable-next-line func-name-matching, func-style, no-shadow
  const windowConstructor = function Window() {
    throw new TypeError("Illegal constructor");
  };
  Object.setPrototypeOf(windowConstructor, EventTargetConstructor);

  Object.defineProperty(windowInstance, "Window", {
    configurable: true,
    writable: true,
    value: windowConstructor
  });

  const windowPrototype = Object.create(EventTargetConstructor.prototype);
  Object.defineProperties(windowPrototype, {
    constructor: {
      value: windowConstructor,
      writable: true,
      configurable: true
    },
    [Symbol.toStringTag]: {
      value: "Window",
      configurable: true
    }
  });

  windowConstructor.prototype = windowPrototype;
  Object.setPrototypeOf(windowInstance, windowPrototype);

  EventTarget.setup(windowInstance, windowInstance);
  mixin(windowInstance, WindowEventHandlersImpl.prototype);
  mixin(windowInstance, GlobalEventHandlersImpl.prototype);
  windowInstance._initGlobalEvents();

  windowInstance._globalObject = windowInstance;
}

// NOTE: per https://heycam.github.io/webidl/#Global, all properties on the Window object must be own-properties.
// That is why we assign everything inside of the constructor, instead of using a shared prototype.
// You can verify this in e.g. Firefox or Internet Explorer, which do a good job with Web IDL compliance.
function Window(options) {
  setupWindow(this, { runScripts: options.runScripts });

  const rawPerformance = new RawPerformance();
  const windowInitialized = rawPerformance.now();

  const window = this;

  ///// PRIVATE DATA PROPERTIES

  this._resourceLoader = options.resourceLoader;

  // vm initialization is deferred until script processing is activated
  this._globalProxy = this;
  Object.defineProperty(idlUtils.implForWrapper(this), idlUtils.wrapperSymbol, { get: () => this._globalProxy });

  // List options explicitly to be clear which are passed through
  this._document = documents.createWrapper(window, {
    parsingMode: options.parsingMode,
    contentType: options.contentType,
    encoding: options.encoding,
    cookieJar: options.cookieJar,
    url: options.url,
    lastModified: options.lastModified,
    referrer: options.referrer,
    concurrentNodeIterators: options.concurrentNodeIterators,
    parseOptions: options.parseOptions,
    defaultView: this._globalProxy,
    global: this
  }, { alwaysUseDocumentClass: true });

  if (vm.isContext(window)) {
    const documentImpl = idlUtils.implForWrapper(window._document);
    documentImpl._defaultView = window._globalProxy = vm.runInContext("this", window);
  }

  const documentOrigin = idlUtils.implForWrapper(this._document)._origin;
  this._origin = documentOrigin;

  // https://html.spec.whatwg.org/#session-history
  this._sessionHistory = new SessionHistory({
    document: idlUtils.implForWrapper(this._document),
    url: idlUtils.implForWrapper(this._document)._URL,
    stateObject: null
  }, this);

  this._virtualConsole = options.virtualConsole;

  this._runScripts = options.runScripts;

  // Set up the window as if it's a top level window.
  // If it's not, then references will be corrected by frame/iframe code.
  this._parent = this._top = this._globalProxy;
  this._frameElement = null;

  // This implements window.frames.length, since window.frames returns a
  // self reference to the window object.  This value is incremented in the
  // HTMLFrameElement implementation.
  this._length = 0;

  this._pretendToBeVisual = options.pretendToBeVisual;
  this._storageQuota = options.storageQuota;

  // Some properties (such as localStorage and sessionStorage) share data
  // between windows in the same origin. This object is intended
  // to contain such data.
  if (options.commonForOrigin && options.commonForOrigin[documentOrigin]) {
    this._commonForOrigin = options.commonForOrigin;
  } else {
    this._commonForOrigin = {
      [documentOrigin]: {
        localStorageArea: new Map(),
        sessionStorageArea: new Map(),
        windowsInSameOrigin: [this]
      }
    };
  }

  this._currentOriginData = this._commonForOrigin[documentOrigin];

  ///// WEB STORAGE

  this._localStorage = Storage.create(window, [], {
    associatedWindow: this,
    storageArea: this._currentOriginData.localStorageArea,
    type: "localStorage",
    url: this._document.documentURI,
    storageQuota: this._storageQuota
  });
  this._sessionStorage = Storage.create(window, [], {
    associatedWindow: this,
    storageArea: this._currentOriginData.sessionStorageArea,
    type: "sessionStorage",
    url: this._document.documentURI,
    storageQuota: this._storageQuota
  });

  ///// SELECTION

  // https://w3c.github.io/selection-api/#dfn-selection
  this._selection = Selection.createImpl(window);

  // https://w3c.github.io/selection-api/#dom-window
  this.getSelection = function () {
    return window._selection;
  };

  ///// GETTERS

  const locationbar = BarProp.create(window);
  const menubar = BarProp.create(window);
  const personalbar = BarProp.create(window);
  const scrollbars = BarProp.create(window);
  const statusbar = BarProp.create(window);
  const toolbar = BarProp.create(window);
  const external = External.create(window);
  const navigator = Navigator.create(window, [], { userAgent: this._resourceLoader._userAgent });
  const performance = Performance.create(window, [], { rawPerformance });
  const screen = Screen.create(window);
  const customElementRegistry = CustomElementRegistry.create(window);

  define(this, {
    get length() {
      return window._length;
    },
    get window() {
      return window._globalProxy;
    },
    get frameElement() {
      return idlUtils.wrapperForImpl(window._frameElement);
    },
    get frames() {
      return window._globalProxy;
    },
    get self() {
      return window._globalProxy;
    },
    get parent() {
      return window._parent;
    },
    get top() {
      return window._top;
    },
    get document() {
      return window._document;
    },
    get external() {
      return external;
    },
    get location() {
      return idlUtils.wrapperForImpl(idlUtils.implForWrapper(window._document)._location);
    },
    get history() {
      return idlUtils.wrapperForImpl(idlUtils.implForWrapper(window._document)._history);
    },
    get navigator() {
      return navigator;
    },
    get locationbar() {
      return locationbar;
    },
    get menubar() {
      return menubar;
    },
    get personalbar() {
      return personalbar;
    },
    get scrollbars() {
      return scrollbars;
    },
    get statusbar() {
      return statusbar;
    },
    get toolbar() {
      return toolbar;
    },
    get performance() {
      return performance;
    },
    get screen() {
      return screen;
    },
    get origin() {
      return window._origin;
    },
    // The origin IDL attribute is defined with [Replaceable].
    set origin(value) {
      Object.defineProperty(this, "origin", {
        value,
        writable: true,
        enumerable: true,
        configurable: true
      });
    },
    get localStorage() {
      if (idlUtils.implForWrapper(this._document)._origin === "null") {
        throw DOMException.create(window, [
          "localStorage is not available for opaque origins",
          "SecurityError"
        ]);
      }

      return this._localStorage;
    },
    get sessionStorage() {
      if (idlUtils.implForWrapper(this._document)._origin === "null") {
        throw DOMException.create(window, [
          "sessionStorage is not available for opaque origins",
          "SecurityError"
        ]);
      }

      return this._sessionStorage;
    },
    get customElements() {
      return customElementRegistry;
    }
  });

  namedPropertiesWindow.initializeWindow(this, this._globalProxy);

  ///// METHODS

  // https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#timers

  // In the spec the list of active timers is a set of IDs. We make it a map of IDs to Node.js timer objects, so that
  // we can call Node.js-side clearTimeout() when clearing, and thus allow process shutdown faster.
  const listOfActiveTimers = new Map();
  let latestTimerId = 0;

  this.setTimeout = function (handler, timeout = 0, ...args) {
    if (typeof handler !== "function") {
      handler = webIDLConversions.DOMString(handler);
    }
    timeout = webIDLConversions.long(timeout);

    return timerInitializationSteps(handler, timeout, args, { methodContext: window, repeat: false });
  };
  this.setInterval = function (handler, timeout = 0, ...args) {
    if (typeof handler !== "function") {
      handler = webIDLConversions.DOMString(handler);
    }
    timeout = webIDLConversions.long(timeout);

    return timerInitializationSteps(handler, timeout, args, { methodContext: window, repeat: true });
  };

  this.clearTimeout = function (handle = 0) {
    handle = webIDLConversions.long(handle);

    const nodejsTimer = listOfActiveTimers.get(handle);
    if (nodejsTimer) {
      clearTimeout(nodejsTimer);
      listOfActiveTimers.delete(handle);
    }
  };
  this.clearInterval = function (handle = 0) {
    handle = webIDLConversions.long(handle);

    const nodejsTimer = listOfActiveTimers.get(handle);
    if (nodejsTimer) {
      // We use setTimeout() in timerInitializationSteps even for this.setInterval().
      clearTimeout(nodejsTimer);
      listOfActiveTimers.delete(handle);
    }
  };

  function timerInitializationSteps(handler, timeout, args, { methodContext, repeat, previousHandle }) {
    // This appears to be unspecced, but matches browser behavior for close()ed windows.
    if (!methodContext._document) {
      return 0;
    }

    // TODO: implement timer nesting level behavior.

    const methodContextProxy = methodContext._globalProxy;
    const handle = previousHandle !== undefined ? previousHandle : ++latestTimerId;

    function task() {
      if (!listOfActiveTimers.has(handle)) {
        return;
      }

      try {
        if (typeof handler === "function") {
          handler.apply(methodContextProxy, args);
        } else if (window._runScripts === "dangerously") {
          vm.runInContext(handler, window, { filename: window.location.href, displayErrors: false });
        }
      } catch (e) {
        reportException(window, e, window.location.href);
      }

      if (listOfActiveTimers.has(handle)) {
        if (repeat) {
          timerInitializationSteps(handler, timeout, args, { methodContext, repeat: true, previousHandle: handle });
        } else {
          listOfActiveTimers.delete(handle);
        }
      }
    }

    if (timeout < 0) {
      timeout = 0;
    }

    const nodejsTimer = setTimeout(task, timeout);
    listOfActiveTimers.set(handle, nodejsTimer);

    return handle;
  }

  // https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#animation-frames

  let animationFrameCallbackId = 0;
  const mapOfAnimationFrameCallbacks = new Map();
  let animationFrameNodejsInterval = null;

  // Unlike the spec, where an animation frame happens every 60 Hz regardless, we optimize so that if there are no
  // requestAnimationFrame() calls outstanding, we don't fire the timer. This helps us track that.
  let numberOfOngoingAnimationFrameCallbacks = 0;

  if (this._pretendToBeVisual) {
    this.requestAnimationFrame = function (callback) {
      callback = webIDLConversions.Function(callback);

      const handle = ++animationFrameCallbackId;
      mapOfAnimationFrameCallbacks.set(handle, callback);

      ++numberOfOngoingAnimationFrameCallbacks;
      if (numberOfOngoingAnimationFrameCallbacks === 1) {
        animationFrameNodejsInterval = setInterval(() => {
          runAnimationFrameCallbacks(rawPerformance.now() - windowInitialized);
        }, 1000 / 60);
      }

      return handle;
    };

    this.cancelAnimationFrame = function (handle) {
      handle = webIDLConversions["unsigned long"](handle);

      removeAnimationFrameCallback(handle);
    };

    function runAnimationFrameCallbacks(now) {
      // Converting to an array is important to get a sync snapshot and thus match spec semantics.
      const callbackHandles = [...mapOfAnimationFrameCallbacks.keys()];
      for (const handle of callbackHandles) {
        // This has() can be false if a callback calls cancelAnimationFrame().
        if (mapOfAnimationFrameCallbacks.has(handle)) {
          const callback = mapOfAnimationFrameCallbacks.get(handle);
          removeAnimationFrameCallback(handle);
          try {
            callback(now);
          } catch (e) {
            reportException(window, e, window.location.href);
          }
        }
      }
    }

    function removeAnimationFrameCallback(handle) {
      if (mapOfAnimationFrameCallbacks.has(handle)) {
        --numberOfOngoingAnimationFrameCallbacks;
        if (numberOfOngoingAnimationFrameCallbacks === 0) {
          clearInterval(animationFrameNodejsInterval);
        }
      }

      mapOfAnimationFrameCallbacks.delete(handle);
    }
  }

  function stopAllTimers() {
    for (const nodejsTimer of listOfActiveTimers.values()) {
      clearTimeout(nodejsTimer);
    }
    listOfActiveTimers.clear();

    clearInterval(animationFrameNodejsInterval);
  }

  function Option(text, value, defaultSelected, selected) {
    if (text === undefined) {
      text = "";
    }
    text = webIDLConversions.DOMString(text);

    if (value !== undefined) {
      value = webIDLConversions.DOMString(value);
    }

    defaultSelected = webIDLConversions.boolean(defaultSelected);
    selected = webIDLConversions.boolean(selected);

    const option = window._document.createElement("option");
    const impl = idlUtils.implForWrapper(option);

    if (text !== "") {
      impl.text = text;
    }
    if (value !== undefined) {
      impl.setAttributeNS(null, "value", value);
    }
    if (defaultSelected) {
      impl.setAttributeNS(null, "selected", "");
    }
    impl._selectedness = selected;

    return option;
  }
  Object.defineProperty(Option, "prototype", {
    value: this.HTMLOptionElement.prototype,
    configurable: false,
    enumerable: false,
    writable: false
  });
  Object.defineProperty(window, "Option", {
    value: Option,
    configurable: true,
    enumerable: false,
    writable: true
  });

  function Image() {
    const img = window._document.createElement("img");
    const impl = idlUtils.implForWrapper(img);

    if (arguments.length > 0) {
      impl.setAttributeNS(null, "width", String(arguments[0]));
    }
    if (arguments.length > 1) {
      impl.setAttributeNS(null, "height", String(arguments[1]));
    }

    return img;
  }
  Object.defineProperty(Image, "prototype", {
    value: this.HTMLImageElement.prototype,
    configurable: false,
    enumerable: false,
    writable: false
  });
  Object.defineProperty(window, "Image", {
    value: Image,
    configurable: true,
    enumerable: false,
    writable: true
  });

  function Audio(src) {
    const audio = window._document.createElement("audio");
    const impl = idlUtils.implForWrapper(audio);
    impl.setAttributeNS(null, "preload", "auto");

    if (src !== undefined) {
      impl.setAttributeNS(null, "src", String(src));
    }

    return audio;
  }
  Object.defineProperty(Audio, "prototype", {
    value: this.HTMLAudioElement.prototype,
    configurable: false,
    enumerable: false,
    writable: false
  });
  Object.defineProperty(window, "Audio", {
    value: Audio,
    configurable: true,
    enumerable: false,
    writable: true
  });

  this.postMessage = postMessage(window);

  this.atob = function (str) {
    const result = atob(str);
    if (result === null) {
      throw DOMException.create(window, [
        "The string to be decoded contains invalid characters.",
        "InvalidCharacterError"
      ]);
    }
    return result;
  };

  this.btoa = function (str) {
    const result = btoa(str);
    if (result === null) {
      throw DOMException.create(window, [
        "The string to be encoded contains invalid characters.",
        "InvalidCharacterError"
      ]);
    }
    return result;
  };

  this.stop = function () {
    const manager = idlUtils.implForWrapper(this._document)._requestManager;
    if (manager) {
      manager.close();
    }
  };

  this.close = function () {
    // Recursively close child frame windows, then ourselves (depth-first).
    for (let i = 0; i < this.length; ++i) {
      this[i].close();
    }

    // Clear out all listeners. Any in-flight or upcoming events should not get delivered.
    idlUtils.implForWrapper(this)._eventListeners = Object.create(null);

    if (this._document) {
      if (this._document.body) {
        this._document.body.innerHTML = "";
      }

      if (this._document.close) {
        // It's especially important to clear out the listeners here because document.close() causes a "load" event to
        // fire.
        idlUtils.implForWrapper(this._document)._eventListeners = Object.create(null);
        this._document.close();
      }
      const doc = idlUtils.implForWrapper(this._document);
      if (doc._requestManager) {
        doc._requestManager.close();
      }
      delete this._document;
    }

    stopAllTimers();
    WebSocketImpl.cleanUpWindow(this);
  };

  this.getComputedStyle = function (elt) {
    elt = Element.convert(elt);
    let pseudoElt = arguments[1];
    if (pseudoElt !== undefined && pseudoElt !== null) {
      pseudoElt = webIDLConversions.DOMString(pseudoElt);
    }

    if (pseudoElt !== undefined && pseudoElt !== null && pseudoElt !== "") {
      // TODO: Parse pseudoElt

      if (SHADOW_DOM_PSEUDO_REGEXP.test(pseudoElt)) {
        throw new TypeError("Tried to get the computed style of a Shadow DOM pseudo-element.");
      }

      notImplemented("window.computedStyle(elt, pseudoElt)", this);
    }

    const declaration = new CSSStyleDeclaration();
    const { forEach } = Array.prototype;
    const { style } = elt;

    forEachMatchingSheetRuleOfElement(elt, rule => {
      forEach.call(rule.style, property => {
        declaration.setProperty(
          property,
          rule.style.getPropertyValue(property),
          rule.style.getPropertyPriority(property)
        );
      });
    });

    // https://drafts.csswg.org/cssom/#dom-window-getcomputedstyle
    const declarations = Object.keys(propertiesWithResolvedValueImplemented);
    forEach.call(declarations, property => {
      declaration.setProperty(property, getResolvedValue(elt, property));
    });

    forEach.call(style, property => {
      declaration.setProperty(property, style.getPropertyValue(property), style.getPropertyPriority(property));
    });

    return declaration;
  };

  this.getSelection = function () {
    return window._document.getSelection();
  };

  // The captureEvents() and releaseEvents() methods must do nothing
  this.captureEvents = function () {};

  this.releaseEvents = function () {};

  ///// PUBLIC DATA PROPERTIES (TODO: should be getters)

  function wrapConsoleMethod(method) {
    return (...args) => {
      window._virtualConsole.emit(method, ...args);
    };
  }

  this.console = {
    assert: wrapConsoleMethod("assert"),
    clear: wrapConsoleMethod("clear"),
    count: wrapConsoleMethod("count"),
    countReset: wrapConsoleMethod("countReset"),
    debug: wrapConsoleMethod("debug"),
    dir: wrapConsoleMethod("dir"),
    dirxml: wrapConsoleMethod("dirxml"),
    error: wrapConsoleMethod("error"),
    group: wrapConsoleMethod("group"),
    groupCollapsed: wrapConsoleMethod("groupCollapsed"),
    groupEnd: wrapConsoleMethod("groupEnd"),
    info: wrapConsoleMethod("info"),
    log: wrapConsoleMethod("log"),
    table: wrapConsoleMethod("table"),
    time: wrapConsoleMethod("time"),
    timeLog: wrapConsoleMethod("timeLog"),
    timeEnd: wrapConsoleMethod("timeEnd"),
    trace: wrapConsoleMethod("trace"),
    warn: wrapConsoleMethod("warn")
  };

  function notImplementedMethod(name) {
    return function () {
      notImplemented(name, window);
    };
  }

  define(this, {
    name: "",
    status: "",
    devicePixelRatio: 1,
    innerWidth: 1024,
    innerHeight: 768,
    outerWidth: 1024,
    outerHeight: 768,
    pageXOffset: 0,
    pageYOffset: 0,
    screenX: 0,
    screenLeft: 0,
    screenY: 0,
    screenTop: 0,
    scrollX: 0,
    scrollY: 0,

    alert: notImplementedMethod("window.alert"),
    blur: notImplementedMethod("window.blur"),
    confirm: notImplementedMethod("window.confirm"),
    focus: notImplementedMethod("window.focus"),
    moveBy: notImplementedMethod("window.moveBy"),
    moveTo: notImplementedMethod("window.moveTo"),
    open: notImplementedMethod("window.open"),
    print: notImplementedMethod("window.print"),
    prompt: notImplementedMethod("window.prompt"),
    resizeBy: notImplementedMethod("window.resizeBy"),
    resizeTo: notImplementedMethod("window.resizeTo"),
    scroll: notImplementedMethod("window.scroll"),
    scrollBy: notImplementedMethod("window.scrollBy"),
    scrollTo: notImplementedMethod("window.scrollTo")
  });

  ///// INITIALIZATION

  process.nextTick(() => {
    if (!window.document) {
      return; // window might've been closed already
    }

    if (window.document.readyState === "complete") {
      fireAnEvent("load", window, undefined, {}, window.document);
    } else {
      window.document.addEventListener("load", () => {
        fireAnEvent("load", window, undefined, {}, window.document);

        if (!idlUtils.implForWrapper(window._document)._pageShowingFlag) {
          idlUtils.implForWrapper(window._document)._pageShowingFlag = true;
          fireAnEvent("pageshow", window, PageTransitionEvent, { persisted: false }, window.document);
        }
      });
    }
  });
}

function contextifyWindow(window) {
  if (vm.isContext(window)) {
    return;
  }

  vm.createContext(window);
}
