$(document)
    .ready(function () {
        var idCounter = -1;
        var milestonesForm = $('#milestones-form');
        var group_uses_milestone_dates = ($('#uses_milestone_dates')
            .length > 0);
        var milestone_order_has_changed = false;
        var switch_date_use_form = $("#switch-date-use-form");

        // make sure we got the lowest number for idCounter
        milestonesForm.find('.edit-milestone input[name$="-id"]')
            .each(function () {
                var v = +this.value;
                if (!isNaN(v) && v < idCounter)
                    idCounter = v - 1;
            });

        function setChanged() {
            $(this)
                .closest(".edit-milestone")
                .addClass("changed");
            setSubmitButtonState();
            if (switch_date_use_form) {
                switch_date_use_form.addClass("d-none");
            }
        }

        milestonesForm.on("change", '.edit-milestone select,.edit-milestone input,.edit-milestone textarea', setChanged);
        milestonesForm.on("click", '.edit-milestone .select2 input', setChanged);

        // the required stuff seems to trip up many browsers with dynamic forms
        milestonesForm.find("input")
            .prop("required", false);

        function setSubmitButtonState() {
            var action;
            var milestone_cnt = milestonesForm.find(".milestonerow")
                .length;
            var milestone_hidden_cnt = milestonesForm.find(".edit-milestone.d-none")
                .length;
            var milestone_change_cnt = milestonesForm.find(".edit-milestone.changed")
                .length;
            var milestone_delete_cnt = milestonesForm.find(".edit-milestone.delete")
                .length;
            if (milestone_cnt != milestone_hidden_cnt || milestone_order_has_changed)
                action = "review";
            else
                action = "save";

            milestonesForm.find("input[name=action]")
                .val(action);

            var submit = milestonesForm.find("[type=submit]");
            submit.text(submit.data("label" + action));
            if (milestone_change_cnt + milestone_delete_cnt > 0 || action == "review") {
                submit.removeClass("d-none");
            } else {
                submit.addClass("d-none");
            }
        }

        milestonesForm.find(".milestone")
            .on("click", function () {
                var row = $(this),
                    editRow = row.next(".edit-milestone");
                row.addClass("d-none");
                editRow.removeClass("d-none");

                editRow.find('input[name$="desc"]')
                    .trigger("focus");

                setSubmitButtonState();

                // collapse unchanged rows
                milestonesForm.find(".milestone")
                    .not(this)
                    .each(function () {
                        var e = $(this)
                            .next('.edit-milestone');
                        if (e.is(":visible") && !e.hasClass("changed")) {
                            $(this)
                                .removeClass("d-none");
                            e.addClass("d-none");
                        }
                    });
            });

        milestonesForm.find(".add-milestone")
            .on("click", function () {
                var template = $("#extratemplatecontainer .extratemplate");
                var templateclone = template.clone();
                $("#dragdropcontainer")
                    .append(templateclone);
                var new_milestone = $("#dragdropcontainer > div:last");
                var new_edit_milestone = new_milestone.find(".edit-milestone");
                var new_edit_milestone_order = $("#dragdropcontainer > div")
                    .length;

                new_milestone.removeClass("extratemplate");
                new_milestone.addClass("draggable");
                new_milestone.addClass("milestonerow");

                var newId = idCounter;
                --idCounter;

                var prefix = "m" + newId;
                new_edit_milestone.find('input[name="prefix"]')
                    .val(prefix);
                new_edit_milestone.find('input[name="order"]')
                    .val(new_edit_milestone_order);

                new_edit_milestone.find("input,select,textarea")
                    .each(function () {
                        if (this.name == "prefix")
                            return;

                        if (this.name == "id")
                            this.value = "" + idCounter;

                        this.name = prefix + "-" + this.name;
                        this.id = prefix + "-" + this.id;
                    });
                new_edit_milestone.find("label")
                    .each(function () {
                        if (this.htmlFor)
                            this.htmlFor = prefix + "-" + this.htmlFor;
                    });

                new_edit_milestone.removeClass("template");
                new_edit_milestone.removeClass("d-none");

                new_edit_milestone.find(".select2-field")
                    .each(function () {
                        window.setupSelect2Field($(this)); // from select2-field.js
                    });

                new_edit_milestone.find("[data-provide='datepicker']")
                    .each(function () {
                        enable_datepicker($(this)[0]); // from datepicker.js
                    });

                if (!group_uses_milestone_dates) {
                    setOrderControlValue();
                }
                setSubmitButtonState();
            });

        function setResolvedState() {
            var resolved = $(this)
                .is(":checked");
            // var label = $(this)
            //     .closest(".edit-milestone")
            //     .find("label[for=" + this.id + "]");
            var reason = $(this)
                .closest(".edit-milestone")
                .find("[name$=resolved]");
            if (resolved) {
                reason.closest(".row")
                    .removeClass("d-none");
                if (!reason.val())
                    reason.val(reason.data("default"));
            } else {
                reason.closest(".row")
                    .addClass("d-none");
                reason.val("");
            }
        }

        milestonesForm.find(".edit-milestone [name$=resolved_checkbox]")
            .each(setResolvedState);
        milestonesForm.on("change", ".edit-milestone [name$=resolved_checkbox]", setResolvedState);

        function setDeleteState() {
            var edit = $(this)
                .closest(".edit-milestone");
            var row = edit.prev(".milestone");

            if ($(this)
                .is(":checked")) {
                if (+edit.find('input[name$="id"]')
                    .val() < 0) {
                    edit.remove();
                    setSubmitButtonState();
                } else {
                    row.addClass("delete");
                    edit.addClass("delete");
                }
            } else {
                row.removeClass("delete");
                edit.removeClass("delete");
            }
        }

        function setOrderControlValue() {
            $("#dragdropcontainer > div")
                .each(function (index) {
                    var prefix = $(this)
                        .find('input[name="prefix"]')
                        .val();
                    $(this)
                        .find('input[name="' + prefix + '-order"]')
                        .val(index);
                });
        }

        milestonesForm.find(".edit-milestone [name$=delete]")
            .each(setDeleteState);
        milestonesForm.on("change", ".edit-milestone input[name$=delete]", setDeleteState);

        milestonesForm.find('.edit-milestone .is-invalid')
            .each(function () {
                $(this)
                    .closest(".edit-milestone")
                    .prev()
                    .trigger("click");
            });

        setSubmitButtonState();

        if (!group_uses_milestone_dates) {
            setOrderControlValue();

            var options = {
                animation: 150,
                draggable: ".draggable",
                onEnd: function () {
                    milestone_order_has_changed = true;
                    setSubmitButtonState();
                    setOrderControlValue();
                    if (switch_date_use_form) {
                        switch_date_use_form.addClass("d-none");
                    }
                }
            };

            var el = document.getElementById('dragdropcontainer');
            Sortable.create(el, options);
        }
    });