package nz.ac.otago.infosci.timekeeper;

import android.content.Intent;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ProgressBar;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.app.AppCompatDelegate;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;
import java.util.Date;
import java.util.TimeZone;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;

public class TimerActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Intent it = getIntent();

        final int endHour = it.getIntExtra("endHour", -1);
        final int endMinutes = it.getIntExtra("endMinutes", -1);
        final int updatePeriod = it.getIntExtra("updatePeriod", -1);
        final boolean dimScreen = it.getBooleanExtra("dimScreen", false);

        final View root = getWindow().getDecorView();
        final Window window = getWindow();

        // force the dark layout
        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);

        // keep screen on
        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

        final int flags = View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
                | View.SYSTEM_UI_FLAG_IMMERSIVE
                | View.SYSTEM_UI_FLAG_FULLSCREEN
                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;


        // fullscreen, sticky immersive
        root.setSystemUiVisibility(flags);

        // re-enable immersive mode after a system UI change (such as switching back from another app)
        root.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {

            @Override
            public void onSystemUiVisibilityChange(int visibility) {
                if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
                    root.setSystemUiVisibility(flags);
                }
            }
        });


        if(dimScreen) {
            WindowManager.LayoutParams params = getWindow().getAttributes();
            params.screenBrightness = 0.025f;
            getWindow().setAttributes(params);
        }

        setContentView(R.layout.activity_timer);


        final TextView txtCounter = findViewById(R.id.txtCounter);
        final TextView txtPercent = findViewById(R.id.txtPercent);
        final ProgressBar progressBar = findViewById(R.id.progressBar);
        final TextView txtTime = findViewById(R.id.txtTime);
        final TextView txtStatus = findViewById(R.id.txtStatus);

        txtStatus.setText("");
        txtPercent.setText("0%");


        final LocalTime start = LocalTime.now();
        final LocalTime end = LocalTime.of(endHour, endMinutes);

        final int duration = Math.toIntExact(ChronoUnit.MILLIS.between(start, end));


        progressBar.setMax(duration);
        progressBar.setMin(0);

        final DateTimeFormatter timeFmt = DateTimeFormatter.ofPattern("h:mm a");
        final DateFormat fmt = new SimpleDateFormat("m:ss");
        fmt.setTimeZone(TimeZone.getTimeZone("UTC"));

        Timer timer = new Timer();

        timer.scheduleAtFixedRate(new TimerTask() {

            synchronized public void run() {

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        LocalTime now = LocalTime.now();
                        int remaining = Math.toIntExact(ChronoUnit.MILLIS.between(now, end));
                        int percent = Math.round(((duration - remaining) / (float) duration) * 100);

                        txtTime.setText(timeFmt.format(now).toLowerCase());
                        if (remaining > 0) {
                            long minutesRemaining = TimeUnit.MILLISECONDS.toMinutes(remaining) + 1;
                            if (minutesRemaining > 2) {
                                txtCounter.setText(String.valueOf(minutesRemaining));
                            } else {
                                txtCounter.setText(fmt.format(new Date(remaining)));
                            }
                            txtPercent.setText(percent+"%");
                            progressBar.setProgress(duration - Math.toIntExact(remaining), true);
                        } else {
                            if(dimScreen) {
                                WindowManager.LayoutParams params = getWindow().getAttributes();
                                params.screenBrightness = WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE;
                                getWindow().setAttributes(params);

                                progressBar.setBackgroundColor(Color.RED);
                            }
                            progressBar.setProgress(progressBar.getMax());
                            txtCounter.setText(fmt.format(new Date(Math.abs(remaining))));
                            txtPercent.setText("100%");
                            txtStatus.setText("Overtime!");
                        }
                    }
                });

            }

        }, 0, updatePeriod * 1000);

    }


}