/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

/* global ExtensionAPI, XPCOMUtils */

XPCOMUtils.defineLazyGlobalGetters(this, ["URL"]);

function getInfoFrameScript(messageName) {
  /* eslint-env mozilla/frame-script */

  const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");

  function getInnerWindowId(window) {
    return window.windowUtils.currentInnerWindowID;
  }

  function getInnerWindowIDsForAllFrames(window) {
    const innerWindowID = getInnerWindowId(window);
    let ids = [innerWindowID];

    if (window.frames) {
      for (let i = 0; i < window.frames.length; i++) {
        ids = ids.concat(getInnerWindowIDsForAllFrames(window.frames[i]));
      }
    }

    return ids;
  }

  function getLoggedMessages(window, includePrivate = false) {
    const ids = getInnerWindowIDsForAllFrames(window);
    return getConsoleMessages(ids).concat(getScriptErrors(ids, includePrivate))
                                  .sort((a, b) => a.timeStamp - b.timeStamp)
                                  .map(m => m.message);
  }

  function getConsoleMessages(windowIds) {
    const ConsoleAPIStorage = Cc["@mozilla.org/consoleAPI-storage;1"]
                              .getService(Ci.nsIConsoleAPIStorage);
    let messages = [];
    for (const id of windowIds) {
      messages = messages.concat(ConsoleAPIStorage.getEvents(id) || []);
    }
    return messages.map(evt => {
      const {columnNumber, filename, level, lineNumber, timeStamp} = evt;
      const args = evt.arguments.map(arg => {
        return "" + arg;
      }).join(", ");
      const message = `[console.${level}(${args}) ${filename}:${lineNumber}:${columnNumber}]`;
      return {timeStamp, message};
    });
  }

  function getScriptErrors(windowIds, includePrivate = false) {
    const messages = Services.console.getMessageArray() || [];
    return messages.filter(message => {
      if (message instanceof Ci.nsIScriptError) {
        if (!includePrivate && message.isFromPrivateWindow) {
          return false;
        }

        if (windowIds && !windowIds.includes(message.innerWindowID)) {
          return false;
        }

        return true;
      }

      // If this is not an nsIScriptError and we need to do window-based
      // filtering we skip this message.
      return false;
    }).map(error => {
      const {timeStamp, message} = error;
      return {timeStamp, message};
    });
  }

  sendAsyncMessage(messageName, {
    hasMixedActiveContentBlocked: docShell.hasMixedActiveContentBlocked,
    hasMixedDisplayContentBlocked: docShell.hasMixedDisplayContentBlocked,
    hasTrackingContentBlocked: docShell.hasTrackingContentBlocked,
    log: getLoggedMessages(content),
  });
}

this.tabExtras = class extends ExtensionAPI {
  getAPI(context) {
    const {tabManager} = context.extension;
    const {Management: {global: {windowTracker}}} =
                ChromeUtils.import("resource://gre/modules/Extension.jsm", null);

    const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");

    return {
      tabExtras: {
        async loadURIWithPostData(tabId, url, postData, postDataContentType) {
          const tab = tabManager.get(tabId);
          if (!tab || !tab.browser) {
            return Promise.reject("Invalid tab");
          }

          try {
            new URL(url);
          } catch (_) {
            return Promise.reject("Invalid url");
          }

          if (typeof postData !== "string" && !(postData instanceof String)) {
            return Promise.reject("postData must be a string");
          }

          const stringStream = Cc["@mozilla.org/io/string-input-stream;1"]
                               .createInstance(Ci.nsIStringInputStream);
          stringStream.data = postData;
          const post = Cc["@mozilla.org/network/mime-input-stream;1"]
                       .createInstance(Ci.nsIMIMEInputStream);
          post.addHeader("Content-Type", postDataContentType ||
                                         "application/x-www-form-urlencoded");
          post.setData(stringStream);

          return new Promise(resolve => {
            const listener = {
              onLocationChange(browser, webProgress, request, locationURI, flags) {
                if (webProgress.isTopLevel &&
                    browser === tab.browser &&
                    locationURI.spec === url) {
                  windowTracker.removeListener("progress", listener);
                  resolve();
                }
              },
            };
            windowTracker.addListener("progress", listener);

            let loadURIOptions = {
              triggeringPrincipal: Services.scriptSecurityManager.createNullPrincipal({}),
              postData: post,
            };
            tab.browser.webNavigation.loadURI(url, loadURIOptions);
          });
        },
        async getWebcompatInfo(tabId) {
          return new Promise(resolve => {
            const messageName = "WebExtension:GetWebcompatInfo";
            const code = `${getInfoFrameScript.toString()};getInfoFrameScript("${messageName}")`;
            const mm = tabManager.get(tabId).browser.messageManager;
            mm.loadFrameScript(`data:,${encodeURI(code)}`, false);
            mm.addMessageListener(messageName, function receiveFn(message) {
              mm.removeMessageListener(messageName, receiveFn);
              resolve(message.json);
            });
          });
        },
      },
    };
  }
};