/*-
 * #%L
 * Year Month Calendar Add-on
 * %%
 * Copyright (C) 2021 - 2025 Flowing Code
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */
package com.flowingcode.addons.ycalendar;

import com.flowingcode.vaadin.jsonmigration.JsonMigration;
import com.flowingcode.vaadin.jsonmigration.JsonSerializer;
import com.vaadin.flow.component.AttachEvent;
import com.vaadin.flow.component.Component;
import com.vaadin.flow.component.ComponentEventListener;
import com.vaadin.flow.component.ComponentUtil;
import com.vaadin.flow.component.UI;
import com.vaadin.flow.component.datepicker.DatePicker.DatePickerI18n;
import com.vaadin.flow.function.SerializableConsumer;
import com.vaadin.flow.shared.Registration;
import elemental.json.JsonObject;
import java.util.Objects;
import lombok.experimental.ExtensionMethod;

/**
 * A base abstract class for calendar components, with additional methods used for i18n initialization
 * and listener registration.
 */
@SuppressWarnings("serial")
@ExtensionMethod(JsonMigration.class)
public abstract class AbstractCalendarComponent<COMPONENT extends Component> extends Component {

  private DatePickerI18n i18n;

  @Override
  protected void onAttach(AttachEvent attachEvent) {
    if (i18n != null) {
      setI18nWithJS();
    }
    refreshAll();
  }

  /**
   * Sets the i18n object.
   *
   * @param i18n the DatepickerI18n object used to initialize i18n
   */
  public void setI18n(DatePickerI18n i18n) {
    Objects.requireNonNull(i18n, "The I18N properties object should not be null");
    this.i18n = i18n;
    getUI().ifPresent(ui -> setI18nWithJS());
  }

  private void setI18nWithJS() {
    runBeforeClientResponse(ui -> {
      // Merge current web component I18N settings with new I18N settings
      JsonObject i18nObject = (JsonObject) JsonSerializer.toJson(i18n);
      getElement().executeJs("this.i18n = Object.assign({}, this.i18n, $0);", i18nObject);
    });
  }

  private void runBeforeClientResponse(SerializableConsumer<UI> command) {
    getElement().getNode()
        .runWhenAttached(ui -> ui.beforeClientResponse(this, context -> command.accept(ui)));
  }

  public abstract void refreshAll();

  /**
   * Adds a date selection listener. The listener is called when the user selects a given date.
   *
   * @param listener the value change listener, not null
   * @return a registration for the listener
   */
  @SuppressWarnings({"unchecked", "rawtypes"})
  public Registration addDateSelectedListener(
      ComponentEventListener<DateSelectedEvent<? super COMPONENT>> listener) {
    return ComponentUtil.addListener(this, DateSelectedEvent.class,
        (ComponentEventListener) listener);
  }

}