const {classes: Cc, interfaces: Ci, utils: Cu} = Components;

//Cu.import("resource://gre/modules/PopupNotifications.jsm");
Cu.import("resource://gre/modules/Services.jsm");

var AutoFocusUrlbar = {
    cs: Services.console,  // nsIConsoleService
    ww: Services.ww,       // nsIWindowWatcher
    wm: Services.wm,       // nsIWindowMediator
    ps: Services.prefs,

    get doc() {
        return this.wm.getMostRecentWindow("navigator:browser").document;
    },

    get eres() {
        return this.ps.getCharPref('extensions.AutoFocusUrlbar.excludeChar');
    },

    handleEvent: function (e) {
        var document = this.doc;
        var elm = document.activeElement;
        while (1) {
            if (elm == null) return;
            if (elm.localName == "browser" || elm.localName == "iframe" ||
                elm.localName == "frame") {
                elm = elm.contentDocument.activeElement;
                continue;
            }
            break;
        }
        if (elm.ownerDocument.designMode == 'on' ||
            elm.localName == "input" || elm.localName == "textarea" ||
            elm.localName == "select" ||
            elm.isContentEditable) return;
        var mod = e.ctrlKey || e.metaKey || e.altKey;
        if (mod) return;
        var c = String.fromCharCode(e.charCode);
        var excludePattern;
        try {
            var excludeRegExpString = this.eres;
            excludePattern = new RegExp(excludeRegExpString);
        } catch (err) {
            excludePattern = /[^a-zA-Z]/;
        }
        if (excludePattern.test(c)) return;
        var urlbar = document.getElementById("urlbar");
        if (!urlbar) return;
        e.preventDefault();
        urlbar.focus();
        try {
            urlbar.value = '';
            var evt = document.createEvent("KeyboardEvent");
            evt.initKeyEvent('keypress', false, true, null,
                             false, false, false, false, 0, e.charCode);
            var input = urlbar.inputField;
            input.dispatchEvent(evt);
        } catch (err) {
            urlbar.value = c;
        }
    },

    aListener: {
        onOpenWindow: function (aWindow) {
            var win = aWindow.docShell.QueryInterface(Ci
                .nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindow);
            win.addEventListener("load", function () {
                win.removeEventListener("load", arguments.callee, true);
                if (win.document.documentElement.getAttribute("windowtype") !=
                    "navigator:browser") return;
                win.addEventListener("keypress", AutoFocusUrlbar, false);
            }, true);
        },
        onCloseWindow: function (aWindow) {},
        onWindowTitleChange: function (aWindow, aTitle) {},
    },

    startup: function () {
        this.wm.addListener(this.aListener);
        var cw = this.wm.getEnumerator("navigator:browser");
        while (cw.hasMoreElements()) {
            var win = cw.getNext().QueryInterface(Ci.nsIDOMWindow);
            win.addEventListener("keypress", this, false);
        }
    },
    shutdown: function () {
        this.wm.removeListener(this.aListener);
        var cw = this.wm.getEnumerator("navigator:browser");
        while (cw.hasMoreElements()) {
            var win = cw.getNext().QueryInterface(Ci.nsIDOMWindow);
            win.removeEventListener("keypress", this, false);
        }
    }
}


// 启用
function startup(data, reason) {
    var cs = Services.console;
    AutoFocusUrlbar.startup();
}

// 禁用或应用程序退出
function shutdown(data, reason) {
    AutoFocusUrlbar.shutdown();
}

// 安装
function install(data, reason) {
}

// 卸载
function uninstall(data, reason) {
}