sbool SimpleCRUD_searcher = true;

sclass SimpleCRUD<A extends Concept> {

  Class<A> cc;

  JTable table;

  JPanel buttons, panel;

  O renderer; // optional, func(A) -> Map

  S hID = "ID";

  Set<S> excludeFieldsFromEditing;

  *(Class<A> *cc) {}

  SimpleCRUD<A> show(S frameTitle) {

    make();

    showFrame(frameTitle, panel);

    this;

  }

  SimpleCRUD<A> show() {

    ret show(plural(shortClassName(cc)));

  }

  SimpleCRUD<A> showMaximized() { show(); maximizeFrame(panel); ret this; }

  JPanel make() {

    db();

    framesBot();

    // next line not in swing part to allow passing arguments

    // from outside like showConceptsTable_afterUpdate

    table = makeConceptsTable(cc, wrapRenderer(renderer));

    swing {

      panel = centerAndSouthWithMargin(SimpleCRUD_searcher ? tableWithSearcher(table, withMargin := true) : table, buttons = jRightAlignedLine(

        jbutton("Add...", r { newConcept() }),

        tableDependButton(table, jbutton("Edit", r {

          editConcept(selectedConcept())

        })),

        tableDependButton(table, jbutton("Delete", r {

          final L<A> l = selectedConcepts();

          withDBLock(r { for (A c : l) c.delete() });

        }))));

      O fEdit = voidfunc(int row) {

        editConcept((A) getConcept(toLong(getTableCell(table, row, 0))))

      };

      tablePopupMenuItem(table, "Edit...", fEdit);

      onDoubleClick(table, fEdit);

    }

    ret panel;

  }

  O wrapRenderer(fO renderer) {

    ret renderer == null ? null : func(A a) {

      putAll(litorderedmap(hID, str(a.id)), (Map) callF(renderer, a))

    };

  }

  void newConcept {

    final A c = unlisted(cc);

    final Map<S, JComponent> map = makeComponents(c);

    Runnable r = r {

      register(c);

      saveData(c, map);

    };

    showFormTitled("New " + shortClassName(cc), arrayPlus(mapToObjectArray(map), r));

  }

  void editConcept(final A c) {

    if (c == null) ret;

    final Map<S, JComponent> map = makeComponents(c);

    Runnable r = r { saveData(c, map) };

    showFormTitled("Edit " + shortClassName(cc) + " #" + c.id, arrayPlus(mapToObjectArray(map), r));

  }

  A selectedConcept() {

    ret (A) getConcept(toLong(selectedTableCell(table, 0)));

  }

  L<A> selectedConcepts() {

    int[] rows = table.getSelectedRows();

    new L<A> l;

    for (int row : rows)

      l.add((A) getConcept(toLong(getTableCell(table, row, 0))));

    ret l;

  }

  Map<S, JComponent> makeComponents(A c) {

    Map<S, JComponent> map = litorderedmap();

    makeComponents(c, map);

    ret map;

  }

  JComponent fieldComponent(A c, S field) {

    Class type = getFieldType(cc, field);

    O value = getOpt(c, field);

    //print("Field type: " + field + " => " + type);

    if (type == bool.class)

      ret jCenteredCheckBox(isTrue(value));

    else try {

      ret autoComboBox(structureOrText_crud(value), new TreeSet<S>(map structureOrText_crud(collect(list(cc), field))));

    } catch e {

      printException(e);

      ret jTextField(structureOrText_crud(value));

    }

  }

  void saveComponent(A c, S field, JComponent comp) {

    comp = unwrap(comp);

    if (comp instanceof JTextComponent)

      cset(c, field, convertToField(getTextTrim((JTextComponent) comp), cc, field));

    else if (comp instanceof JComboBox)

      cset(c, field, convertToField(getTextTrim((JComboBox) comp), cc, field));

    else if (comp instanceof JCheckBox)

      cset(c, field, isChecked((JCheckBox) comp));

    ifclass ImageChooser

      else if (comp instanceof ImageChooser)

        cUpdatePNGFile(c, field, comp/ImageChooser.getImage(), false);

    endif

  }

  L<S> fields() {

    ret listWithoutSet([S field : conceptFieldsInOrder(cc) | fieldType(cc, field) != Concept.Ref.class], excludeFieldsFromEditing);

  }

  // override the following two methods to customize edit window

  void makeComponents(A c, Map<S, JComponent> map) {

    for (S field : fields())

      map.put(field, fieldComponent(c, field));

  }

  void saveData(A c, Map<S, JComponent> components) {

    for (S field : keys(components))

      saveComponent(c, field, components.get(field));

  }

}