var settings_profile_fields = (function () {

var exports = {};

var meta = {
    loaded: false,
};

var order = [];

exports.field_type_id_to_string = function (type_id) {
    var name = _.find(page_params.custom_profile_field_types, function (type) {
        return type[0] === type_id;
    })[1];
    return name;
};

function delete_profile_field(e) {
    e.preventDefault();
    e.stopPropagation();

    settings_ui.do_settings_change(
        channel.del,
        "/json/realm/profile_fields/" + encodeURIComponent($(this).attr('data-profile-field-id')),
        {}, $('#admin-profile-field-status').expectOne());
}

function read_field_data_from_form(selector) {
    var field_data = {};
    var i = 0;
    selector.each(function (ind, row) {
        var value = i;
        var text = row.children[0].value;
        var order = row.children[1].value;
        field_data[value] = {text: text, order: order};
        i += 1;
    });
    return field_data;
}

function create_choice_row(container, add_delete_button) {
    var context = {};
    context.add_delete_button = add_delete_button;
    var row = templates.render("profile-field-choice", context);
    $(container).append(row);
}

function clear_form_data() {
    $("#profile_field_name").val("");
    $("#profile_field_hint").val("");
    // Set default in field type dropdown
    $("#profile_field_type").val("1");
    // Clear data from choice field form
    $("#profile_field_choices").html("");
    create_choice_row($("#profile_field_choices"), false);
    $("#profile_field_choices_row").hide();
}

function create_profile_field(e) {
    e.preventDefault();
    e.stopPropagation();

    var selector = $('.admin-profile-field-form div.choice-row');
    var field_data = {};
    if ($('#profile_field_type').val() === '3') {
        // Only read choice data if we are creating a choice field.
        field_data = read_field_data_from_form(selector);
    }
    $('#profile_field_data').val(JSON.stringify(field_data));
    var opts = {
        success_continuation: clear_form_data,
    };

    settings_ui.do_settings_change(channel.post, "/json/realm/profile_fields", $(this).serialize(),
                                   $('#admin-profile-field-status').expectOne(), opts);
}

function add_choice_row(e) {
    var choices_div = e.delegateTarget;
    create_choice_row(choices_div, true);
}

function delete_choice_row(e) {
    var row = $(e.currentTarget).parent();
    row.remove();
}

function move_field(e, btn, direction) {
    e.preventDefault();
    e.stopPropagation();
    var button_id = parseInt(btn.attr('data-profile-field-id'), 10);
    var button_index = order.indexOf(button_id);
    order[button_index] = order[button_index + direction];
    order[button_index + direction] = button_id;
    settings_ui.do_settings_change(channel.patch, "/json/realm/profile_fields",
                                   {order: JSON.stringify(order)},
                                   $('#admin-profile-field-status').expectOne());
}

function move_field_up(e) {
    move_field(e, $(this), -1);
}

function move_field_down(e) {
    move_field(e, $(this), 1);
}

function get_profile_field_info(id) {
    var info = {};
    info.row = $("tr.profile-field-row[data-profile-field-id='" + id + "']");
    info.form = $("tr.profile-field-form[data-profile-field-id='" + id + "']");
    return info;
}

function get_profile_field(id) {
    var all_custom_fields = page_params.custom_profile_fields;
    var field;
    for (var i = 0; i < all_custom_fields.length; i += 1) {
        if (all_custom_fields[i].id === id) {
            field = all_custom_fields[i];
            break;
        }
    }
    return field;
}

function open_edit_form(e) {
    var field_id = $(e.currentTarget).attr("data-profile-field-id");
    var profile_field = get_profile_field_info(field_id);

    profile_field.row.hide();
    profile_field.form.show();
    var field = get_profile_field(parseInt(field_id,10));
    // Set initial value in edit form
    profile_field.form.find('input[name=name]').val(field.name);
    profile_field.form.find('input[name=hint]').val(field.hint);

    profile_field.form.find('.reset').on("click", function () {
        profile_field.form.hide();
        profile_field.row.show();
    });

    profile_field.form.find('.submit').on("click", function () {
        e.preventDefault();
        e.stopPropagation();

        var profile_field_status = $('#admin-profile-field-status').expectOne();

        // For some reason jQuery's serialize() is not working with
        // channel.patch even though it is supported by $.ajax.
        var data = {};
        data.name = profile_field.form.find('input[name=name]').val();
        data.hint = profile_field.form.find('input[name=hint]').val();
        var selector = profile_field.form.find('div.choice-row');
        data.field_data = JSON.stringify(read_field_data_from_form(selector));

        settings_ui.do_settings_change(channel.patch, "/json/realm/profile_fields/" + field_id,
                                       data, profile_field_status);
    });

    profile_field.form.find(".profile-field-choices").on("click", "button.add-choice", add_choice_row);
    profile_field.form.find(".profile-field-choices").on("click", "button.delete-choice", delete_choice_row);
}

exports.reset = function () {
    meta.loaded = false;
};

exports.populate_profile_fields = function (profile_fields_data) {
    $("#account-settings .custom-profile-fields-form").html("");
    settings_account.add_custom_profile_fields_to_settings();

    if (!meta.loaded) {
        return;
    }

    var profile_fields_table = $("#admin_profile_fields_table").expectOne();
    profile_fields_table.find("tr.profile-field-row").remove();  // Clear all rows.
    profile_fields_table.find("tr.profile-field-form").remove();  // Clear all rows.
    order = [];
    _.each(profile_fields_data, function (profile_field, index) {
        order.push(profile_field.id);
        var field_data = {};
        if (profile_field.field_data !== "") {
            field_data = JSON.parse(profile_field.field_data);
        }
        var choices = [];
        _.each(field_data, function (choice, value) {
            choices.push({
                value: value,
                text: choice.text,
                order: choice.order,
                add_delete_button: true,
            });
        });
        if (choices.length > 0) {
            // Remove delete button from the first choice. This makes sure that
            // the user cannot delete all choices of a choice field. To delete
            // all choices, just delete the field.
            choices[0].add_delete_button = false;
        }

        var is_choice_field = false;
        if (profile_field.type === 3) {
            is_choice_field = true;
        }

        profile_fields_table.append(
            templates.render(
                "admin_profile_field_list", {
                    profile_field: {
                        id: profile_field.id,
                        name: profile_field.name,
                        hint: profile_field.hint,
                        type: exports.field_type_id_to_string(profile_field.type),
                        choices: choices,
                        is_choice_field: is_choice_field,
                    },
                    can_modify: page_params.is_admin,
                    first: index === 0,
                    last: index === _.size(profile_fields_data) - 1,
                }
            )
        );
    });
    loading.destroy_indicator($('#admin_page_profile_fields_loading_indicator'));
};

function set_up_choices_field() {
    create_choice_row('#profile_field_choices', false);

    if ($('#profile_field_type').val() !== '3') {
        // If 'Choice' type is already selected, show choice row.
        $("#profile_field_choices_row").hide();
    }

    $('#profile_field_type').on('change', function (e) {
        if ($(e.target).val() === '3') {
            $("#profile_field_choices_row").show();
        } else {
            $("#profile_field_choices_row").hide();
        }
    });

    $("#profile_field_choices").on("click", "button.add-choice", add_choice_row);
    $("#profile_field_choices").on("click", "button.delete-choice", delete_choice_row);
}

exports.set_up = function () {
    meta.loaded = true;

    // create loading indicators
    loading.make_indicator($('#admin_page_profile_fields_loading_indicator'));
    // Populate profile_fields table
    exports.populate_profile_fields(page_params.custom_profile_fields);

    $('#admin_profile_fields_table').on('click', '.delete', delete_profile_field);
    $(".organization").on("submit", "form.admin-profile-field-form", create_profile_field);
    $("#admin_profile_fields_table").on("click", ".open-edit-form", open_edit_form);
    $("#admin_profile_fields_table").on("click", ".move-field-up", move_field_up);
    $("#admin_profile_fields_table").on("click", ".move-field-down", move_field_down);
    set_up_choices_field();
};

return exports;
}());

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