/* 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/. */

var timer = require("timer");
var {Cc,Ci} = require("chrome");

function onBrowserLoad(callback, event) {
  if (event.target && event.target.defaultView == this) {
    this.removeEventListener("load", onBrowserLoad, true);
    let browsers = this.document.getElementsByTagName("tabbrowser");
    try {
      require("timer").setTimeout(function (window) {
        callback(window, browsers[0]);
      }, 10, this);
    } catch (e) { console.exception(e); }
  }
}
// Utility function to open a new browser window.
function openBrowserWindow(callback, url) {
  let ww = Cc["@mozilla.org/embedcomp/window-watcher;1"].
           getService(Ci.nsIWindowWatcher);
  let urlString = Cc["@mozilla.org/supports-string;1"].
                  createInstance(Ci.nsISupportsString);
  urlString.data = url;
  let window = ww.openWindow(null, "chrome://browser/content/browser.xul",
                             "_blank", "chrome,all,dialog=no", urlString);
  if (callback)
    window.addEventListener("load", onBrowserLoad.bind(window, callback), true);

  return window;
}

// Helper for calling code at window close
function closeBrowserWindow(window, callback) {
  require("timer").setTimeout(function() {
    window.addEventListener("unload", function onUnload() {
      window.removeEventListener("unload", onUnload, false);
      callback();
    }, false);
    window.close();
  }, 0);
}

// Helper for opening two windows at once
function openTwoWindows(callback) {
  openBrowserWindow(function (window1) {
    openBrowserWindow(function (window2) {
      callback(window1, window2);
    });
  });
}

// Helper for closing two windows at once
function closeTwoWindows(window1, window2, callback) {
  closeBrowserWindow(window1, function() {
    closeBrowserWindow(window2, callback);
  });
}

exports.testAddTab = function(test) {
  test.waitUntilDone();
  openBrowserWindow(function(window, browser) {
    const tabBrowser = require("tab-browser");

    let cache = [];
    let windowUtils = require("window-utils");
    new windowUtils.WindowTracker({
      onTrack: function(win) {
        cache.push(win);
      },
      onUntrack: function(win) {
        cache.splice(cache.indexOf(win), 1)
      }
    });
    let startWindowCount = cache.length;

    // Test 1: add a tab
    let firstUrl = "data:text/html,one";
    tabBrowser.addTab(firstUrl, {
      onLoad: function(e) {
        let win1 = cache[startWindowCount - 1];
        test.assertEqual(win1.content.location, firstUrl, "URL of new tab in first window matches");

        // Test 2: add a tab in a new window
        let secondUrl = "data:text/html,two";
        tabBrowser.addTab(secondUrl, {
          inNewWindow: true,
          onLoad: function(e) {
            test.assertEqual(cache.length, startWindowCount + 1, "a new window was opened");
            let win2 = cache[startWindowCount];
            let gBrowser = win2.gBrowser;
            gBrowser.addEventListener("DOMContentLoaded", function onLoad(e) {
              gBrowser.removeEventListener("DOMContentLoaded", onLoad, false);
              test.assertEqual(win2.content.location, secondUrl, "URL of new tab in the new window matches");

              closeBrowserWindow(win2, function() {
                closeBrowserWindow(win1, function() {
                  test.done();
                });
              });
            }, false);
          }
        });
      }
    });
  });
};

exports.testTrackerWithDelegate = function(test) {
  test.waitUntilDone();
  const tabBrowser = require("tab-browser");

  var delegate = {
    state: "initializing",
    onTrack: function onTrack(browser) {
      if (this.state == "initializing") {
        this.state = "waiting for browser window to open";
      }
      else if (this.state == "waiting for browser window to open") {
        this.state = "waiting for browser window to close";
        require("timer").setTimeout(function() {
          closeBrowserWindow(browser.ownerDocument.defaultView, function() {
            test.assertEqual(delegate.state, "deinitializing");
            tb.unload();
            test.done();
          });
        }, 0);
      }
      else
        test.fail("invalid state");
    },
    onUntrack: function onUntrack(browser) {
      if (this.state == "waiting for browser window to close") {
        test.pass("proper state in onUntrack");
        this.state = "deinitializing";
      }
      else if (this.state != "deinitializing")
        test.fail("invalid state");
    }
  };
  var tb = new tabBrowser.Tracker(delegate);

  delegate.state = "waiting for browser window to open";

  openBrowserWindow();
};

exports.testWhenContentLoaded = function(test) {
  test.waitUntilDone();
  const tabBrowser = require("tab-browser");

  var tracker = tabBrowser.whenContentLoaded(
    function(window) {
      var item = window.document.getElementById("foo");
      test.assertEqual(item.textContent, "bar",
                       "whenContentLoaded() works.");
      tracker.unload();
      closeBrowserWindow(activeWindow(), function() {
        test.done();
      });
    });

  openBrowserWindow(function(browserWindow, browser) {
    var html = '<div id="foo">bar</div>';
    browser.addTab("data:text/html," + html);
  });
};

exports.testTrackerWithoutDelegate = function(test) {
  test.waitUntilDone();
  const tabBrowser = require("tab-browser");

  openBrowserWindow(function(browserWindow, browser) {
    var tb = new tabBrowser.Tracker();

    if (tb.length == 0)
      test.fail("expect at least one tab browser to exist.");

    for (var i = 0; i < tb.length; i++)
      test.assertEqual(tb.get(i).nodeName, "tabbrowser",
                       "get() method and length prop should work");
    for (var b in tb)
      test.assertEqual(b.nodeName, "tabbrowser",
                       "iterator should work");

    var matches = [b for (b in tb)
                           if (b == browser)];
    test.assertEqual(matches.length, 1,
                     "New browser should be in tracker.");
    tb.unload();

    closeBrowserWindow(browserWindow, function() {
      test.done();
    });
  });
};

exports.testTabTracker = function(test) {
  test.waitUntilDone();
  const tabBrowser = require("tab-browser");

  openBrowserWindow(function(browserWindow, browser) {
    var delegate = {
      tracked: 0,
      onTrack: function(tab) {
        this.tracked++;
      },
      onUntrack: function(tab) {
        this.tracked--;
      }
    };

    let tabTracker = tabBrowser.TabTracker(delegate);

    let tracked = delegate.tracked;
    let url1 = "data:text/html,1";
    let url2 = "data:text/html,2";
    let url3 = "data:text/html,3";
    let tabCount = 0; 

    function tabLoadListener(e) {
      let loadedURL = e.target.defaultView.location;
      if (loadedURL == url1)
        tabCount++;
      else if (loadedURL == url2)
        tabCount++;
      else if (loadedURL == url3)
        tabCount++;

      if (tabCount == 3) {
        test.assertEqual(delegate.tracked, tracked + 3, "delegate tracked tabs matched count");
        tabTracker.unload();
        closeBrowserWindow(browserWindow, function() {
          require("timer").setTimeout(function() test.done(), 0);
        });
      }
    }

    tabBrowser.addTab(url1, {
      onLoad: tabLoadListener
    });
    tabBrowser.addTab(url2, {
      onLoad: tabLoadListener
    });
    tabBrowser.addTab(url3, {
      onLoad: tabLoadListener
    });
  });
};

exports.testActiveTab = function(test) {
  test.waitUntilDone();
  openBrowserWindow(function(browserWindow, browser) {
    const tabBrowser = require("tab-browser");
    const TabModule = require("tab-browser").TabModule;
    let tm = new TabModule(browserWindow);
    test.assertEqual(tm.length, 1);
    let url1 = "data:text/html,foo";
    let url2 = "data:text/html,bar";

    function tabURL(tab) tab.ownerDocument.defaultView.content.location.toString()

    tabBrowser.addTab(url1, {
      onLoad: function(e) {
        // make sure we're running in the right window.
        test.assertEqual(tabBrowser.activeTab.ownerDocument.defaultView, browserWindow, "active window matches");
        browserWindow.focus();

        test.assertEqual(tabURL(tabBrowser.activeTab), url1, "url1 matches");
        let tabIndex = browser.getBrowserIndexForDocument(e.target);
        let tabAtIndex = browser.tabContainer.getItemAtIndex(tabIndex);
        test.assertEqual(tabAtIndex, tabBrowser.activeTab, "activeTab element matches");
        
        tabBrowser.addTab(url2, {
          inBackground: true,
          onLoad: function() {
            test.assertEqual(tabURL(tabBrowser.activeTab), url1, "url1 still matches");
            let tabAtIndex = browser.tabContainer.getItemAtIndex(tabIndex);
            test.assertEqual(tabAtIndex, tabBrowser.activeTab, "activeTab element matches");
            closeBrowserWindow(browserWindow, function() {
              test.done()
            });
          }
        });
      }
    });
  });
};

// TabModule tests
exports.testEventsAndLengthStayInModule = function(test) {
  test.waitUntilDone();
  let TabModule = require("tab-browser").TabModule;

  openTwoWindows(function(window1, window2) {
    let tm1 = new TabModule(window1);
    let tm2 = new TabModule(window2);
    
    let counter1 = 0, counter2 = 0;
    let counterTabs = 0;

    function onOpenListener() {
      ++counterTabs;
      if (counterTabs < 5)
        return;
      test.assertEqual(counter1, 2, "Correct number of events fired from window 1");
      test.assertEqual(counter2, 3, "Correct number of events fired from window 2");
      test.assertEqual(counterTabs, 5, "Correct number of events fired from all windows");
      test.assertEqual(tm1.length, 3, "Correct number of tabs in window 1");
      test.assertEqual(tm2.length, 4, "Correct number of tabs in window 2");
      closeTwoWindows(window1, window2, function() test.done());
    }

    tm1.onOpen = function() ++counter1 && onOpenListener();
    tm2.onOpen = function() ++counter2 && onOpenListener();

    let url = "data:text/html,default";
    tm1.open(url);
    tm1.open(url);

    tm2.open(url);
    tm2.open(url);
    tm2.open(url);
  });
}

exports.testTabModuleActiveTab_getterAndSetter = function(test) {
  test.waitUntilDone();
  let TabModule = require("tab-browser").TabModule;

  openTwoWindows(function(window1, window2) {
    let tm1 = new TabModule(window1);
    let tm2 = new TabModule(window2);

    let tab1 = null;
    tm1.open({
      url: "data:text/html,<title>window1,tab1</title>",
      onOpen: function(tab) tab1 = tab,
    });
    tm1.open("data:text/html,<title>window1,tab2</title>");

    tm1.onActivate = function onActivate() {
      tm1.onActivate.remove(onActivate);
      require("timer").setTimeout(function() {
        test.assertEqual(tm1.activeTab.title, "window1,tab1", "activeTab setter works");
        closeTwoWindows(window1, window2, function() test.done());
      }, 1000);
    }

    tm2.open("data:text/html,<title>window2,tab1</title>");
    tm2.open({
      url: "data:text/html,<title>window2,tab2</title>",
      onOpen: function(tab4) {
        test.assertEqual(tm1.activeTab.title, "window1,tab2", "Correct active tab on window 1");
        test.assertEqual(tm2.activeTab.title, "window2,tab2", "Correct active tab on window 2");

        tm1.activeTab = tab1;
        tm1.activeTab = tab4; // Setting activeTab from another window should have no effect
      }
    });
  });
}

// test tabs iterator
exports.testTabModuleTabsIterator = function(test) {
  test.waitUntilDone();
  let TabModule = require("tab-browser").TabModule;

  openBrowserWindow(function(window) {
    let tm1 = new TabModule(window);
    let url = "data:text/html,default";
    tm1.open(url);
    tm1.open(url);
    tm1.open({
      url: url,
      onOpen: function(tab) {
        let count = 0;
        for each (let t in tm1) count++;
        test.assertEqual(count, 4, "iterated tab count matches");
        test.assertEqual(count, tm1.length, "length tab count matches");
        closeBrowserWindow(window, function() test.done());
      }
    });
  });
};

// inNewWindow parameter is ignored on single-window modules
exports.testTabModuleCantOpenInNewWindow = function(test) {
  test.waitUntilDone();
  let TabModule = require("tab-browser").TabModule;

  openBrowserWindow(function(window) {
    let tm = new TabModule(window);
    let url = "data:text/html,default";
    tm.open({
      url: url,
      inNewWindow: true,
      onOpen: function() {
        test.assertEqual(tm.length, 2, "Tab was open on same window");
        closeBrowserWindow(window, function() test.done());
      }
    });
  });
};

// Test that having two modules attached to the same
// window won't duplicate events fired on each module
exports.testModuleListenersDontInteract = function(test) {
  test.waitUntilDone();
  let TabModule = require("tab-browser").TabModule;

  openBrowserWindow(function(window) {
    let tm1 = new TabModule(window);
    let tm2 = new TabModule(window);

    let url = "data:text/html,foo";
    let eventCount = 0, eventModule1 = 0, eventModule2 = 0;

    
    let listener1 = function() {
      // this should be called twice: when tab is open and when
      // the url location is changed
      eventCount++;
      eventModule1++;
    }
    tm1.onReady = listener1;

    tm2.open({
      url: "about:blank",
      onOpen: function(tab) {
        // add listener via property assignment
        let listener2 = function() {
          eventCount++;
          eventModule2++;
        };
        tab.onReady = listener2;

        // add listener via collection add
        let listener3 = function() {
          eventCount++;
          eventModule2++;
        };
        tab.onReady.add(listener3);

        tab.location = url;

        test.waitUntilEqual(function () eventCount, 4,
                            "Correct global number of events")
            .then(function () {
              test.assertEqual(eventModule1, 2,
                               "Correct number of events on module 1");
              test.assertEqual(eventModule2, 2,
                               "Correct number of events on module 2");

              tm1.onReady.remove(listener1);
              tab.onReady.remove(listener2);
              tab.onReady.remove(listener3);
              closeBrowserWindow(window, function() test.done());
            });
      }
    });
  });
};

/******************* helpers *********************/

// Helper for getting the active window
function activeWindow() {
  return Cc["@mozilla.org/appshell/window-mediator;1"].
         getService(Ci.nsIWindowMediator).
         getMostRecentWindow("navigator:browser");
};

// If the module doesn't support the app we're being run in, require() will
// throw.  In that case, remove all tests above from exports, and add one dummy
// test that passes.
try {
  require("tab-browser");
}
catch (err) {
  // This bug should be mentioned in the error message.
  let bug = "https://bugzilla.mozilla.org/show_bug.cgi?id=560716";
  if (err.message.indexOf(bug) < 0)
    throw err;
  for (let [prop, val] in Iterator(exports)) {
    if (/^test/.test(prop) && typeof(val) === "function")
      delete exports[prop];
  }
  exports.testAppNotSupported = function (test) {
    test.pass("the tab-browser module does not support this application.");
  };
}