/*-
 * #%L
 * Simple Timer Addon
 * %%
 * Copyright (C) 2019 - 2026 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.vaadin.addons.simpletimer;

import com.vaadin.flow.component.Component;
import com.vaadin.flow.component.ComponentEvent;
import com.vaadin.flow.component.ComponentEventListener;
import com.vaadin.flow.component.DomEvent;
import com.vaadin.flow.component.HasSize;
import com.vaadin.flow.component.HasStyle;
import com.vaadin.flow.component.Synchronize;
import com.vaadin.flow.component.Tag;
import com.vaadin.flow.component.dependency.JsModule;
import com.vaadin.flow.component.dependency.NpmPackage;
import com.vaadin.flow.dom.PropertyChangeListener;
import com.vaadin.flow.shared.Registration;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;

/** @author Leonardo Scardanzan / Flowing Code */
@Tag("simple-timer")
@NpmPackage(value = "@polymer/polymer", version = "3.5.2")
@JsModule("./simple-timer/simple-timer.js")
public class SimpleTimer extends Component implements HasSize, HasStyle, Serializable {

  private static final long serialVersionUID = 1L;
  private static final String DISPLAY = "display";
  private static final String INLINE = "inline";
  private static final String CURRENT_TIME = "currentTime";

  /** Creates a timer */
  public SimpleTimer() {
    getElement().getStyle().set(DISPLAY, INLINE);
  }

  /**
   * Sets the start time, for countdown mode.
   *
   * @param startTime value in seconds for the start time
   */
  public void setStartTime(final Number startTime) {
    getElement().setProperty("countUp", false);
    getElement().setProperty("startTime", startTime.doubleValue());
    getElement().setProperty(CURRENT_TIME, startTime.doubleValue());
    reset();
  }

  /**
   * Sets the end time, for countup mode.
   *
   * @param endTime value in seconds for the end time
   */
  public void setEndTime(final Number endTime) {
    getElement().setProperty("countUp", true);
    getElement().setProperty("endTime", endTime.doubleValue());
    reset();
  }

  /**
   * Enables showing fractions of a second
   *
   * @param fractions
   */
  public void setFractions(final boolean fractions) {
    getElement().setProperty("fractions", fractions);
  }

  /**
   * Enables showing minutes
   *
   * @param minutes
   */
  public void setMinutes(final boolean minutes) {
    getElement().setProperty("minutes", minutes);
  }

  /**
   * Enables showing hours and minutes
   *
   * @param hours
   */
  public void setHours(final boolean hours) {
    getElement().setProperty("hours", hours);
  }

  /**
   * Use two digits for hours.
   *
   * @param doubleDigitHours true to format hours using two digits.
   */
  public void setDoubleDigitHours(final boolean doubleDigitHours) {
    getElement().setProperty("doubleDigitHours", doubleDigitHours);
  }

  /** Starts or stops the timer if it is already started */
  public void start() {
    getElement().callJsFunction("start");
  }

  /** Stops the timer, does nothing if already stopped */
  public void pause() {
    getElement().callJsFunction("pause");
  }

  /** Resets the current value to the start time */
  public void reset() {
    getElement().callJsFunction("ready");
  }

  /**
   * Returns the status of the timer
   *
   * @return {@code true} if the timer is running, {@code false} otherwise.
   */
  @Synchronize(property = "isRunning", value = "is-running-changed")
  public boolean isRunning() {
    return getElement().getProperty("isRunning", false);
  }

  /**
   * Returns the last known value of the timer. The value is updated when the
   * CurrentTimeChangeListener executes.
   *
   * @return current value in seconds
   */
  @Synchronize("is-running-changed")
  public BigDecimal getCurrentTime() {
    return BigDecimal.valueOf(getElement().getProperty(CURRENT_TIME, 0d));
  }

  /**
   * Returns the current value of the timer.
   *
   * @return a pending result that completes after retrieving the timer value.
   */
  public CompletableFuture<BigDecimal> getCurrentTimeAsync() {
    return getElement()
        .executeJs("return this.currentTime")
        .toCompletableFuture(Double.class)
        .thenApply(BigDecimal::valueOf);
  }

  /**
   * Adds a property change listener for the {@code currentTime} property
   *
   * @param listener the property change listener
   * @param period the minimum period between listener invocations, or 0 to disable throttling
   * @param periodUnit time duration of throttling period
   *
   * @return this registration, for chaining
   */
  public Registration addCurrentTimeChangeListener(
      PropertyChangeListener listener, long period, TimeUnit periodUnit) {
    int millis = (int) Math.min(periodUnit.toMillis(period), Integer.MAX_VALUE);
    if (listener == null) {
      listener = ev -> {};
    }
    return getElement()
        .addPropertyChangeListener(CURRENT_TIME, "current-time-changed", listener)
        .throttle(millis);
  }

  /** Event that gets triggered when the timer reaches 0 */
  @DomEvent("simple-timer-end")
  public static class TimerEndedEvent extends ComponentEvent<SimpleTimer> {

    public TimerEndedEvent(final SimpleTimer source, final boolean fromClient) {
      super(source, fromClient);
    }
  }

  /**
   * Adds a timer ended listener that will be triggered when the timer reaches 0
   *
   * @param listener
   * @return a handle that can be used for removing the listener
   */
  public Registration addTimerEndEvent(final ComponentEventListener<TimerEndedEvent> listener) {
    return addListener(TimerEndedEvent.class, listener);
  }

  @Override
  public boolean isVisible() {
    return getStyle().get(DISPLAY).equals(INLINE);
  }

  @Override
  public void setVisible(boolean visible) {
    getStyle().set(DISPLAY, visible ? INLINE : "none");
  }
}