package com.synergyhelix.countdown;

import org.apache.commons.lang3.time.DurationFormatUtils;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.time.*;

@RestController
public class CountdownController {

  @GetMapping(value = "/", produces = MediaType.IMAGE_JPEG_VALUE)
  public byte[] countdown() throws IOException {
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    ImageIO.write(createImage(), "jpg", outputStream);

    return outputStream.toByteArray();
  }

  private BufferedImage createImage() throws IOException {
    final BufferedImage image = ImageIO.read(getClass().getResourceAsStream("/chicago.jpg"));

    Graphics g = image.getGraphics();

    Color color = new Color(0, 0, 0, 127);
    g.setColor(color);
    g.fillRect(10, 5, 530, 75);

    g.setColor(Color.WHITE);
    g.setFont(new Font("Courier", Font.BOLD, 57));
    g.drawString(calculateTimeUntilThing(), 15, 60);

    g.setColor(new Color(0xE4002B));
    g.setFont(g.getFont().deriveFont(46f));
    g.drawString("Vacation Timer!", 130, 135);

    g.dispose();

    return image;
  }

  private String calculateTimeUntilThing() {
    ZonedDateTime trip = ZonedDateTime.of(LocalDateTime.parse("2022-08-13T13:00:00"), ZoneId.of("UTC"));

    Duration duration = Duration.between(Instant.now(), trip);

    return DurationFormatUtils.formatDuration(duration.toMillis(), "dd'D' HH'H' mm'M' ss'S'", true);
  }
}