/*
 * Copyright 2012 Google Inc.
 *
 * 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.
 */

package de.dennisguse.opentracks.util;

import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.view.View;
import android.widget.Spinner;
import android.widget.TextView;

import de.dennisguse.opentracks.content.sensor.SensorDataSet;
import de.dennisguse.opentracks.services.sensors.SensorManager;
import de.dennisguse.opentracks.stats.TripStatistics;
import de.dennisguse.opentracks.R;

import java.util.Locale;

/**
 * Utilities for updating the statistics UI labels and values.
 *
 * @author Jimmy Shih
 */
public class StatsUtils {

    private static final String GRADE_PERCENTAGE = "%";
    private static final String GRADE_FORMAT = "%1$d";

    private StatsUtils() {
    }

    /**
     * Sets the location values.
     *
     * @param context     the context
     * @param activity    the activity for finding views. If null, the view cannot be
     *                    null
     * @param view        the containing view for finding views. If null, the activity
     *                    cannot be null
     * @param location    the location
     * @param isRecording true if recording
     */
    public static void setLocationValues(Context context, Activity activity, View view, Location location, boolean isRecording) {
        boolean metricUnits = PreferencesUtils.isMetricUnits(context);
        boolean reportSpeed = PreferencesUtils.isReportSpeed(context);

        // Set speed/pace
        View speed = getView(activity, view, R.id.stats_speed);
        speed.setVisibility(isRecording ? View.VISIBLE : View.INVISIBLE);

        if (isRecording) {
            double value = isRecording && location != null && location.hasSpeed() ? location.getSpeed() : Double.NaN;
            setSpeed(context, speed, R.string.stats_speed, R.string.stats_pace, value, metricUnits, reportSpeed);
        }

        // Set elevation
        boolean showGradeElevation = PreferencesUtils.getBoolean(context, R.string.stats_show_grade_elevation_key, PreferencesUtils.STATS_SHOW_GRADE_ELEVATION_DEFAULT) && isRecording;
        View elevation = getView(activity, view, R.id.stats_elevation);
        elevation.setVisibility(showGradeElevation ? View.VISIBLE : View.GONE);

        if (showGradeElevation) {
            double altitude = location != null && location.hasAltitude() ? location.getAltitude() : Double.NaN;
            setElevationValue(context, elevation, -1, altitude, metricUnits);
        }

        // Set coordinate
        boolean showCoordinate = isRecording && PreferencesUtils.getBoolean(context, R.string.stats_show_coordinate_key, PreferencesUtils.STATS_SHOW_COORDINATE_DEFAULT);
        View coordinateSeparator = getView(activity, view, R.id.stats_coordinate_separator);
        View coordinateContainer = getView(activity, view, R.id.stats_coordinate_container);

        if (coordinateSeparator != null) {
            coordinateSeparator.setVisibility(showCoordinate ? View.VISIBLE : View.GONE);
        }
        coordinateContainer.setVisibility(showCoordinate ? View.VISIBLE : View.GONE);

        if (showCoordinate) {
            double latitude = location != null ? location.getLatitude() : Double.NaN;
            double longitude = location != null ? location.getLongitude() : Double.NaN;
            setCoordinateValue(context, getView(activity, view, R.id.stats_latitude), R.string.stats_latitude, latitude);
            setCoordinateValue(context, getView(activity, view, R.id.stats_longitude), R.string.stats_longitude, longitude);
        }
    }

    public static void setSensorData(Context context, Activity activity, SensorDataSet sensorDataSet, boolean isRecording) {
        {
            // SensorDataSet: heart rate
            int isVisible = View.VISIBLE;
            if (!isRecording || PreferencesUtils.BLUETOOTH_SENSOR_DEFAULT.equals(PreferencesUtils.getString(context, R.string.bluetooth_sensor_key, PreferencesUtils.BLUETOOTH_SENSOR_DEFAULT))) {
                isVisible = View.INVISIBLE;
            }
            getView(activity, null, R.id.stats_sensor_container).setVisibility(isVisible);

            View viewValue = getView(activity, null, R.id.stats_sensor_heart_rate_value);
            View viewSensor = getView(activity, null, R.id.stats_sensor_heart_rate_sensor);
            if (isRecording) {
                setHeartRateData(context, viewValue, viewSensor, sensorDataSet);
            }
        }
    }

    /**
     * Sets the total time value.
     *
     * @param activity  the activity
     * @param totalTime the total time
     */
    public static void setTotalTimeValue(Activity activity, long totalTime) {
        setTimeValue(activity, activity.findViewById(R.id.stats_total_time), R.string.stats_total_time, totalTime);
    }

    /**
     * Sets the trip statistics values.
     *
     * @param context        the context
     * @param activity       the activity for finding views. If null, then view cannot
     *                       be null
     * @param view           the containing view for finding views. If null, the activity
     *                       cannot be null
     * @param tripStatistics the trip statistics
     * @param trackIconValue the track icon value or null to hide the track icon
     *                       spinner
     */
    public static void setTripStatisticsValues(Context context, Activity activity, View view, TripStatistics tripStatistics, String trackIconValue) {
        boolean metricUnits = PreferencesUtils.isMetricUnits(context);
        boolean reportSpeed = PreferencesUtils.isReportSpeed(context);

        // Set total distance
        double totalDistance = tripStatistics == null ? Double.NaN : tripStatistics.getTotalDistance();
        setDistanceValue(context, getView(activity, view, R.id.stats_distance), totalDistance, metricUnits);

        // Set activity type
        Spinner spinner = (Spinner) getView(activity, view, R.id.stats_activity_type_icon);
        spinner.setVisibility(trackIconValue != null ? View.VISIBLE : View.GONE);
        if (trackIconValue != null) {
            TrackIconUtils.setIconSpinner(spinner, trackIconValue);
        }

        // Set total time
        setTimeValue(context, getView(activity, view, R.id.stats_total_time), R.string.stats_total_time, tripStatistics != null ? tripStatistics.getTotalTime() : -1L);

        // Set moving time
        setTimeValue(context, getView(activity, view, R.id.stats_moving_time), R.string.stats_moving_time, tripStatistics != null ? tripStatistics.getMovingTime() : -1L);

        // Set average speed/pace
        double averageSpeed = tripStatistics != null ? tripStatistics.getAverageSpeed() : Double.NaN;
        setSpeed(context, getView(activity, view, R.id.stats_average_speed), R.string.stats_average_speed, R.string.stats_average_pace, averageSpeed, metricUnits, reportSpeed);

        // Set max speed/pace
        double maxSpeed = tripStatistics == null ? Double.NaN : tripStatistics.getMaxSpeed();
        setSpeed(context, getView(activity, view, R.id.stats_max_speed), R.string.stats_max_speed, R.string.stats_fastest_pace, maxSpeed, metricUnits, reportSpeed);

        // Set average moving speed/pace
        double averageMovingSpeed = tripStatistics != null ? tripStatistics.getAverageMovingSpeed() : Double.NaN;
        setSpeed(context, getView(activity, view, R.id.stats_average_moving_speed), R.string.stats_average_moving_speed, R.string.stats_average_moving_pace, averageMovingSpeed, metricUnits, reportSpeed);

        // Set grade/elevation
        boolean showGradeElevation = PreferencesUtils.getBoolean(context, R.string.stats_show_grade_elevation_key, PreferencesUtils.STATS_SHOW_GRADE_ELEVATION_DEFAULT);
        View gradeElevationSeparator = getView(activity, view, R.id.stats_grade_elevation_separator);
        gradeElevationSeparator.setVisibility(showGradeElevation ? View.VISIBLE : View.GONE);

        View gradeElevationContainer = getView(activity, view, R.id.stats_grade_elevation_container);
        gradeElevationContainer.setVisibility(showGradeElevation ? View.VISIBLE : View.GONE);

        if (showGradeElevation) {
            // Set grade
            double minGrade = tripStatistics == null ? Double.NaN : tripStatistics.getMinGrade();
            double maxGrade = tripStatistics == null ? Double.NaN : tripStatistics.getMaxGrade();
            setGradeValue(context, getView(activity, view, R.id.stats_grade_min), R.string.stats_min, minGrade);
            setGradeValue(context, getView(activity, view, R.id.stats_grade_max), R.string.stats_max, maxGrade);

            // Set elevation
            double elevationGain = tripStatistics == null ? Double.NaN : tripStatistics.getTotalElevationGain();
            double minElevation = tripStatistics == null ? Double.NaN : tripStatistics.getMinElevation();
            double maxElevation = tripStatistics == null ? Double.NaN : tripStatistics.getMaxElevation();
            setElevationValue(context, getView(activity, view, R.id.stats_elevation_gain), R.string.stats_gain, elevationGain, metricUnits);
            setElevationValue(context, getView(activity, view, R.id.stats_elevation_min), R.string.stats_min, minElevation, metricUnits);
            setElevationValue(context, getView(activity, view, R.id.stats_elevation_max), R.string.stats_max, maxElevation, metricUnits);
        }
    }

    /**
     * Sets speed.
     *
     * @param context      the context
     * @param view         the containing view
     * @param speedLabelId the speed label id
     * @param paceLabelId  the pace label id
     * @param speed        the speed in meters per second
     * @param metricUnits  true if metric units
     * @param reportSpeed  true if report speed
     */
    private static void setSpeed(Context context, View view, int speedLabelId, int paceLabelId, double speed, boolean metricUnits, boolean reportSpeed) {
        String[] parts = StringUtils.getSpeedParts(context, speed, metricUnits, reportSpeed);
        setItem(context, view, reportSpeed ? speedLabelId : paceLabelId, parts[0], parts[1]);
    }

    /**
     * Sets distance value.
     *
     * @param context     the context
     * @param view        the containing view
     * @param distance    the distance in meters
     * @param metricUnits true if metric units
     */
    private static void setDistanceValue(Context context, View view, double distance, boolean metricUnits) {
        String[] parts = StringUtils.getDistanceParts(context, distance, metricUnits);
        setItem(context, view, R.string.stats_distance, parts[0], parts[1]);
    }

    /**
     * Sets a time value.
     *
     * @param context the context
     * @param view    the containing view
     * @param labelId the label id
     * @param time    the time
     */
    private static void setTimeValue(Context context, View view, int labelId, long time) {
        String value = time == -1L ? null : StringUtils.formatElapsedTime(time);
        setItem(context, view, labelId, value, null);
    }

    /**
     * Sets an elevation value.
     *
     * @param context     the context
     * @param view        the containing view
     * @param labelId     the label id
     * @param elevation   the elevation in meters
     * @param metricUnits true if metric units
     */
    private static void setElevationValue(Context context, View view, int labelId, double elevation, boolean metricUnits) {
        String value;
        String unit;
        if (Double.isNaN(elevation) || Double.isInfinite(elevation)) {
            value = null;
            unit = null;
        } else {
            if (metricUnits) {
                value = StringUtils.formatDecimal(elevation);
                unit = context.getString(R.string.unit_meter);
            } else {
                elevation *= UnitConversions.M_TO_FT;
                value = StringUtils.formatDecimal(elevation);
                unit = context.getString(R.string.unit_feet);
            }
        }
        setItem(context, view, labelId, value, unit);
    }

    /**
     * Sets a grade value.
     *
     * @param context the context
     * @param view    the containing view
     * @param labelId the label id
     * @param grade   the grade in fraction between 0 and 1
     */
    private static void setGradeValue(Context context, View view, int labelId, double grade) {
        String value = Double.isNaN(grade) || Double.isInfinite(grade) ? null
                : String.format(Locale.getDefault(), GRADE_FORMAT, Math.round(grade * 100));
        setItem(context, view, labelId, value, GRADE_PERCENTAGE);
    }

    /**
     * Sets a coordinate value.
     *
     * @param context    the context
     * @param view       the containing view
     * @param labelId    the label id
     * @param coordinate the coordinate in degrees
     */
    private static void setCoordinateValue(Context context, View view, int labelId, double coordinate) {
        String value = Double.isNaN(coordinate) || Double.isInfinite(coordinate) ? null
                : StringUtils.formatCoordinate(coordinate);
        setItem(context, view, labelId, value, null);
    }

    /**
     * Sets a heart rate value (sensor)
     *
     * @param context       the context
     * @param viewValue     the containing view
     * @param sensorDataSet the sensorDataSet
     */
    private static void setHeartRateData(Context context, View viewValue, View viewSensor, SensorDataSet sensorDataSet) {
        String heartRate = context.getString(R.string.value_unknown);
        String sensor = context.getString(R.string.value_unknown);
        if (sensorDataSet != null && sensorDataSet.hasHeartRate() && sensorDataSet.isRecent(SensorManager.MAX_SENSOR_DATE_SET_AGE)) {
            heartRate = StringUtils.formatDecimal(sensorDataSet.getHeartRate(), 0);
            sensor = sensorDataSet.getSensorName();
        }
        setItem(context, viewValue, R.string.sensor_state_heart_rate, heartRate, context.getString(R.string.sensor_unit_beats_per_minute));
        setItem(context, viewSensor, R.string.settings_sensor_bluetooth_sensor, sensor, null);
    }

    /**
     * Sets an item.
     *
     * @param context the context
     * @param view    the containing view
     * @param labelId the label id. -1 to hide the label
     * @param value   the value, can be null
     * @param unit    the unit. Null to hide the unit
     */
    private static void setItem(Context context, View view, int labelId, CharSequence value, CharSequence unit) {
        TextView labelTextView = view.findViewById(R.id.stats_label);
        if (labelTextView != null) {
            if (labelId == -1) {
                labelTextView.setVisibility(View.GONE);
            } else {
                labelTextView.setVisibility(View.VISIBLE);
                labelTextView.setText(labelId);
            }
        }

        TextView valueTextView = view.findViewById(R.id.stats_value);
        TextView unitTextView = view.findViewById(R.id.stats_unit);
        if (valueTextView == null || unitTextView == null) {
            return;
        }

        if (value == null) {
            value = context.getString(R.string.value_unknown);
            unitTextView.setVisibility(View.GONE);
        } else {
            if (unit == null) {
                unitTextView.setVisibility(View.GONE);
            } else {
                unitTextView.setVisibility(View.VISIBLE);
                unitTextView.setText(unit);
            }
        }
        valueTextView.setText(value);
    }

    /**
     * Get a view.
     *
     * @param activity the activity
     * @param view     the containing view
     * @param id       the id
     */
    //TODO What is the difference between the two cases? Is it (still) necessary?
    private static View getView(Activity activity, View view, int id) {
        if (activity != null) {
            return activity.findViewById(id);
        } else {
            return view.findViewById(id);
        }
    }
}