openerp.auth_signup = function(instance) {
    instance.auth_signup = instance.auth_signup || {};
    var _t = instance.web._t;

    instance.web.Login.include({
        start: function() {
            var self = this;
            this.signup_enabled = false;
            this.reset_password_enabled = false;
            return this._super().always(function() {

                // Switches the login box to the select mode whith mode == [default|signup|reset]
                self.on('change:login_mode', self, function() {
                    var mode = self.get('login_mode') || 'default';
                    self.$('*[data-modes]').each(function() {
                        var modes = $(this).data('modes').split(/\s+/);
                        $(this).toggle(modes.indexOf(mode) > -1);
                    });
                    self.$('a.oe_signup_signup:visible').toggle(self.signup_enabled);
                    self.$('a.oe_signup_reset_password:visible').toggle(self.reset_password_enabled);
                });

                // to switch between the signup and regular login form
                self.$('a.oe_signup_signup').click(function(ev) {
                    self.set('login_mode', 'signup');
                    return false;
                });
                self.$('a.oe_signup_back').click(function(ev) {
                    self.set('login_mode', 'default');
                    delete self.params.token;
                    return false;
                });

                var dbname = self.selected_db;

                // if there is an error message in params, show it then forget it
                if (self.params.error_message) {
                    self.show_error(self.params.error_message);
                    delete self.params.error_message;
                }

                if (dbname && self.params.login) {
                    self.$("form input[name=login]").val(self.params.login);
                }

                // bind reset password link
                self.$('a.oe_signup_reset_password').click(self.do_reset_password);

                if (dbname) {
                    self.rpc("/auth_signup/get_config", {dbname: dbname}).then(function(result) {
                        self.signup_enabled = result.signup;
                        self.reset_password_enabled = result.reset_password;
                        if (!self.signup_enabled || self.$("form input[name=login]").val()){
                            self.set('login_mode', self.params.type || 'default');
                        } else {
                            self.set('login_mode', 'signup');
                        }

                        // in case of a signup, retrieve the user information from the token
                        if (self.params.token) {
                            self.rpc("/auth_signup/retrieve", {dbname: dbname, token: self.params.token})
                                .then(self.on_token_loaded, self.on_token_failed);
                        }

                    });
                } else {
                    // TODO: support multiple database mode
                    self.set('login_mode', self.params.type || 'default');
                }
            });
        },

        on_token_loaded: function(result) {
            // select the right the database
            this.selected_db = result.db;
            this.on_db_loaded([result.db]);
            if (result.token) {
                // switch to signup mode, set user name and login
                this.set('login_mode', (this.params.type === 'reset' ? 'reset' : 'signup'));
                this.$("form input[name=name]").val(result.name).attr("readonly", "readonly");
                if (result.login) {
                    this.$("form input[name=login]").val(result.login).attr("readonly", "readonly");
                } else {
                    this.$("form input[name=login]").val(result.email);
                }
            } else {
                // remain in login mode, set login if present
                delete this.params.token;
                this.set('login_mode', 'default');
                this.$("form input[name=login]").val(result.login || "");
            }
        },

        on_token_failed: function(result, ev) {
            if (ev) {
                ev.preventDefault();
            }
            this.show_error(_t("Invalid signup token"));
            delete this.params.db;
            delete this.params.token;
            this.set('login_mode', 'default');
        },

        get_params: function(){
            // signup user (or reset password)
            var db = this.$("form [name=db]").val();
            var name = this.$("form input[name=name]").val();
            var login = this.$("form input[name=login]").val();
            var password = this.$("form input[name=password]").val();
            var confirm_password = this.$("form input[name=confirm_password]").val();
            if (!db) {
                this.do_warn(_t("Login"), _t("No database selected !"));
                return false;
            } else if (!name) {
                this.do_warn(_t("Login"), _t("Please enter a name."));
                return false;
            } else if (!login) {
                this.do_warn(_t("Login"), _t("Please enter a username."));
                return false;
            } else if (!password || !confirm_password) {
                this.do_warn(_t("Login"), _t("Please enter a password and confirm it."));
                return false;
            } else if (password !== confirm_password) {
                this.do_warn(_t("Login"), _t("Passwords do not match; please retype them."));
                return false;
            }
            var params = {
                dbname : db,
                token: this.params.token || "",
                name: name,
                login: login,
                password: password,
            };
            return params;
        },

        on_submit: function(ev) {
            if (ev) {
                ev.preventDefault();
            }
            var login_mode = this.get('login_mode');
            if (login_mode === 'signup' || login_mode === 'reset') {
                var params = this.get_params();
                if (_.isEmpty(params)){
                    return false;
                }
                var self = this,
                    super_ = this._super;
                this.rpc('/auth_signup/signup', params)
                    .done(function(result) {
                        if (result.error) {
                            self.show_error(result.error);
                        } else {
                            super_.apply(self, [ev]);
                        }
                    });
            } else {
                // regular login
                this._super(ev);
            }
        },

        do_reset_password: function(ev) {
            if (ev) {
                ev.preventDefault();
            }
            var self = this;
            var db = this.$("form [name=db]").val();
            var login = this.$("form input[name=login]").val();
            if (!db) {
                this.do_warn(_t("Login"), _t("No database selected !"));
                return $.Deferred().reject();
            } else if (!login) {
                this.do_warn(_t("Login"), _t("Please enter a username or email address."));
                return $.Deferred().reject();
            }
            return self.rpc("/auth_signup/reset_password", { dbname: db, login: login }).done(function(result) {
                self.show_error(_t("An email has been sent with credentials to reset your password"));
                self.set('login_mode', 'default');
            }).fail(function(result, ev) {
                ev.preventDefault();
                self.show_error(result.message);
            });
        },
    });
};