var invite = (function () {

var exports = {};

function update_subscription_checkboxes() {
    // TODO: If we were more clever, we would only do this if the
    // stream list has actually changed; that way, the settings of the
    // checkboxes are saved from invocation to invocation (which is
    // nice if I want to invite a bunch of people at once)
    var streams = [];

    _.each(stream_data.invite_streams(), function (value) {
        var is_notifications_stream = value === page_params.notifications_stream;
        if ((stream_data.subscribed_streams().length === 1) ||
            !is_notifications_stream ||
            (is_notifications_stream && stream_data.get_invite_only(value))) {
            // You can't actually elect not to invite someone to the
            // notifications stream. We won't even show it as a choice unless
            // it's the only stream you have, or if you've made it private.
            var default_status = stream_data.get_default_status(value);
            var invite_status = stream_data.get_invite_only(value);
            streams.push({name: value, invite_only: invite_status, default_stream: default_status});
            // Sort by default status.
            streams.sort(function (a, b) {
                return b.default_stream - a.default_stream;
            });
        }
    });
    $('#streams_to_add').html(templates.render('invite_subscription', {streams: streams}));
}

function reset_error_messages() {
    var invite_status = $('#invite_status');
    var invitee_emails = $("#invitee_emails");
    var invitee_emails_group = invitee_emails.closest('.control-group');

    invite_status.hide().text('').removeClass('alert-error alert-warning alert-success');
    invitee_emails_group.removeClass('warning error');
    if (page_params.development_environment) {
        $('#dev_env_msg').hide().text('').removeClass('alert-error alert-warning alert-success');
    }
}

function prepare_form_to_be_shown() {
    update_subscription_checkboxes();
    reset_error_messages();
}

exports.initialize = function () {
    ui.set_up_scrollbar($("#invite_user_form .modal-body"));
    var invite_status = $('#invite_status');
    var invitee_emails = $("#invitee_emails");
    var invitee_emails_group = invitee_emails.closest('.control-group');

    $('#submit-invitation').button();
    prepare_form_to_be_shown();
    invitee_emails.focus().autosize();

    $("#invite_user_form").ajaxForm({
        dataType: 'json',
        beforeSubmit: function () {
            reset_error_messages();
            // TODO: You could alternatively parse the textarea here, and return errors to
            // the user if they don't match certain constraints (i.e. not real email addresses,
            // aren't in the right domain, etc.)
            //
            // OR, you could just let the server do it. Probably my temptation.
            $('#submit-invitation').button('loading');
            return true;
        },
        success: function () {
            $('#submit-invitation').button('reset');
            invite_status.text(i18n.t('User invited successfully.',
                                      {count: (invitee_emails.val().match(/@/g) || []).length}))
                          .addClass('alert-success')
                          .show();
            invitee_emails.val('');

            if (page_params.development_environment) {
                var email_msg = templates.render('dev_env_email_access');
                $('#dev_env_msg').html(email_msg).addClass('alert-info').show();
            }

        },
        error: function (xhr) {
            $('#submit-invitation').button('reset');
            var arr = JSON.parse(xhr.responseText);
            if (arr.errors === undefined) {
                // There was a fatal error, no partial processing occurred.
                invite_status.text(arr.msg)
                              .addClass('alert-error')
                              .show();
            } else {
                // Some users were not invited.
                var invitee_emails_errored = [];
                var error_list = $('<ul>');
                _.each(arr.errors, function (value) {
                    error_list.append($('<li>').text(value.join(': ')));
                    invitee_emails_errored.push(value[0]);
                });

                invite_status.addClass('alert-warning')
                              .empty()
                              .append($('<p>').text(arr.msg))
                              .append(error_list)
                              .show();
                invitee_emails_group.addClass('warning');

                if (arr.sent_invitations) {
                    invitee_emails.val(invitee_emails_errored.join('\n'));
                } else { // Invitations not sent -- keep all emails in the list
                    var current_emails = invitee_emails.val().split(/\n|,/);
                    invitee_emails.val(util.move_array_elements_to_front(current_emails, invitee_emails_errored).join('\n'));
                }

            }

        },
    });

    overlays.open_overlay({
        name: 'invite',
        overlay: $('#invite-user'),
        on_close: function () {
            hashchange.exit_overlay();
        },
    });
};

$(function () {
    $(document).on('click', '.invite_check_all_button', function (e) {
        $('#streams_to_add :checkbox').prop('checked', true);
        e.preventDefault();
    });

    $(document).on('click', '.invite_uncheck_all_button', function (e) {
        $('#streams_to_add :checkbox').prop('checked', false);
        e.preventDefault();
    });
});

return exports;

}());

if (typeof module !== 'undefined') {
    module.exports = invite;
}