var add_google_contact_login_details = {email: false, password: false, auth_token: false};
/**
 * A helper method to send http requests to the google services.
 */
function add_google_contact_send_request(method, url, content, auth, content_type) {
    request = new XMLHttpRequest();
    request.open(method, url, false);
    if (auth) {
        request.setRequestHeader("Authorization", "GoogleLogin auth=" + auth);
    }
    if (content_type) {
        request.setRequestHeader("Content-type", content_type);
    }
        try {
                request.send(content);
                if (request.status == 200 || request.status == 201 || request.status == 409) {
                        return request.responseText;
                }
                dump(request.status);
                dump(request.responseText);
        } catch (ex) {
                dump(ex);
        }
    return null;
}
/**
 * Extracts information out from a hCard semantic object
 * and returns a google-friendly XML representation.
 */
function add_google_contact_create_xml_from_vcard(hcard) {
    var i;
    var full_address;
    var email;
    var tel;
    var url;
    var xml = "";
    xml += "<atom:entry xmlns:atom='http://www.w3.org/2005/Atom' xmlns:gd='http://schemas.google.com/g/2005'>" + "\n";
    xml += "  <atom:category scheme='http://schemas.google.com/g/2005#kind' term='http://schemas.google.com/contact/2008#contact' />" + "\n";
    //Parse name
    xml += "  <atom:title type='text'>" + hcard.fn + "</atom:title> " + "\n";
    xml += "  <atom:content type='text'>Notes</atom:content>" + "\n";
    if (hcard.email) {
        for (i = 0; i < hcard.email.length; i++) {
            email = hcard.email[i];
            type = 'home';
            if (email.type && email.type[0] == 'work') {
                type = 'work';
            }
            xml += "     <gd:email rel='http://schemas.google.com/g/2005#" + type + "' address='" + email.value + "' />" + "\n";
        }
    }
    if (hcard.tel) {
        for (i = 0; i < hcard.tel.length; i++) {
            tel = hcard.tel[i];
            type = 'home';
            if (tel.type && tel.type[0] == 'work') {
                type = 'work';
            }
            xml += "     <gd:phoneNumber rel='http://schemas.google.com/g/2005#" + type + "'>"  + tel.value + "</gd:phoneNumber>" + "\n";
        }
    }
    if (hcard.adr) {
        for (i = 0; i < hcard.adr.length; i++) {
            adr = hcard.adr[i];
            full_address = "";
            if (adr["street-address"]) {
                full_address += adr["street-address"] + " ";
            }
            if (adr["locality"]) {
                full_address += adr["locality"] + " ";
            }
            if (adr["region"]) {
                full_address += adr["region"] + " ";
            }
            if (adr["postal-code"]) {
                full_address += adr["postal-code"] + " ";
            }
            if (adr["country-name"]) {
                full_address += adr["country-name"] + " ";
            }
            if (full_address != "") {
                xml += "     <gd:postalAddress rel='http://schemas.google.com/g/2005#work'>" + full_address + "</gd:postalAddress>" + "\n";
            }
        }
    }
    xml += "</atom:entry>" + "\n";
    return xml;
}
/**
 * Send a create contact request for the email & auth_token provided.
 *
 * The contact is described in xml.
 *
 * @see add_google_contact_create_xml_from_vcard()
 */
function add_google_contact_create_contact(email_address, auth_token, xml) {
    url = 'http://www.google.com/m8/feeds/contacts/' + escape(email_address) + "/base";

    return add_google_contact_send_request("POST", url, xml, auth_token, "application/atom+xml");
}
/**
 * Fetch an authorisation token for a given
 * username and password
 *
 * @return An authorisation token string
 */
function add_google_contact_login(username, password) {
    var url = 'https://www.google.com/accounts/ClientLogin';
    var content = "";
    content  += "accountType=HOSTED_OR_GOOGLE";
    content  += "&Email="  + username;
    content  += "&Passwd=" + password;
    content  += "&service=cp";
    content  += "&source=NoCompany-Operator-0.1";
    response = add_google_contact_send_request("POST", url, content, null, "application/x-www-form-urlencoded");
    // Sample response
    /*
    HTTP/1.0 200 OK
    Server: GFE/1.3
    Content-Type: text/plain
    SID=DQAAAGgA...7Zg8CTN
    LSID=DQAAAGsA...lk8BBbG
    Auth=DQAAAGgA...dk3fA5N
    */
    if (response) {
        parts = response.split("\n");
        return parts[2].substring(5);
    }
    return null;
}
function add_google_contact_get_login_details() {
    var passwordManager = Components.classes["@mozilla.org/passwordmanager;1"]
                                    .getService(Components.interfaces.nsIPasswordManager);

    var e = passwordManager.enumerator;
    //Ask the existing password manager for google account details
    var queryString = 'https://www.google.com';
    while (e.hasMoreElements()) {
        try {
            var pass = e.getNext().QueryInterface(Components.interfaces.nsIPassword);
            if (pass.host == queryString) {
                email_address = pass.user;
                password      = pass.password;
                //TODO: Check if the email_address is valid (I store my username without the @ details)
                return {email: email_address, password: password, auth_token: false};
            }
        } catch (ex) {
                        dump(ex);
                }
    }
    //We didn't find the details. Oh dear.
    //Better ask nicely.
        var prompts = Components.classes["@mozilla.org/embedcomp/prompt-service;1"]
                                                        .getService(Components.interfaces.nsIPromptService);
    email_address = {value: ""};
    password      = {value: ""};
    check         = {value: true};
    var result = prompts.promptUsernameAndPassword(null, "", "Enter email and password for your Google Account:",
                                                   email_address, password, "Remember password", check);
    if (check.value) {
                try {
                passwordManager.addUser(queryString, email_address.value, password.value);
                } catch (ex) {
                        dump(ex);
                }
    }
    return {email: email_address, password: password, auth_token: false};
}
var add_google_contact = {
    description: "Add to Google Contacts",
    shortDescription: "Add Google Contact",
    scope: {
        semantic: {
          "hCard" : "fn"
        }
    },
    doAction: function(semanticObject, semanticObjectType, propertyIndex) {
                //Do we have login details?
                if (add_google_contact_login_details.email == false) {
                        add_google_contact_login_details = add_google_contact_get_login_details();

                        //If the user cancelled finding them...
                        if (add_google_contact_login_details.email == false) {
                                return false
                        }
                }
        if (!add_google_contact_login_details.auth_token) {
            add_google_contact_login_details.auth_token = add_google_contact_login(add_google_contact_login_details.email,
                                                                                                                                                                        add_google_contact_login_details.password);
        }
        xml = add_google_contact_create_xml_from_vcard(semanticObject);
        result = add_google_contact_create_contact(add_google_contact_login_details.email, add_google_contact_login_details.auth_token, xml);
    }
};
SemanticActions.add("add_google_contact", add_google_contact);