/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * 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 com.android.settings.datetime;

import static android.app.time.Capabilities.CAPABILITY_POSSESSED;

import android.app.TimePickerDialog;
import android.app.time.TimeCapabilities;
import android.app.time.TimeManager;
import android.app.timedetector.ManualTimeSuggestion;
import android.app.timedetector.TimeDetector;
import android.content.Context;
import android.text.TextUtils;
import android.text.format.DateFormat;
import android.util.Log;
import android.widget.TimePicker;

import androidx.preference.Preference;

import com.android.settings.core.BasePreferenceController;
import com.android.settingslib.RestrictedPreference;

import java.util.Calendar;

public class TimePreferenceController extends BasePreferenceController
        implements TimePickerDialog.OnTimeSetListener {

    public interface TimePreferenceHost extends UpdateTimeAndDateCallback {
        void showTimePicker();
    }

    public static final int DIALOG_TIMEPICKER = 1;

    private static final String TAG = "TimePreferenceController";

    private TimePreferenceHost mHost;
    private TimeManager mTimeManager;

    public TimePreferenceController(Context context, String preferenceKey) {
        super(context, preferenceKey);
        mTimeManager = context.getSystemService(TimeManager.class);
    }

    public void setHost(TimePreferenceHost host) {
        mHost = host;
    }

    @Override
    public int getAvailabilityStatus() {
        return isEnabled() ? AVAILABLE : DISABLED_DEPENDENT_SETTING;
    }

    @Override
    public void updateState(Preference preference) {
        super.updateState(preference);

        if (preference instanceof RestrictedPreference
                && ((RestrictedPreference) preference).isDisabledByAdmin()) {
            return;
        }
        preference.setEnabled(isEnabled());
    }

    @Override
    public CharSequence getSummary() {
        Calendar now = Calendar.getInstance();
        return DateFormat.getTimeFormat(mContext).format(now.getTime());
    }

    @Override
    public boolean handlePreferenceTreeClick(Preference preference) {
        if (!TextUtils.equals(getPreferenceKey(), preference.getKey())) {
            return false;
        }
        mHost.showTimePicker();
        return true;
    }

    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        if (mContext != null) {
            setTime(hourOfDay, minute);
            mHost.updateTimeAndDateDisplay(mContext);
        }
        // We don't need to call timeUpdated() here because the TIME_CHANGED
        // broadcast is sent by the AlarmManager as a side effect of setting the
        // SystemClock time.
    }

    /**
     * Builds a {@link TimePickerDialog} that can be used to request the current time from the user.
     */
    public TimePickerDialog buildTimePicker(Context parentContext) {
        final Calendar calendar = Calendar.getInstance();
        return new TimePickerDialog(
                parentContext,
                this,
                calendar.get(Calendar.HOUR_OF_DAY),
                calendar.get(Calendar.MINUTE),
                DateFormat.is24HourFormat(parentContext));
    }

    void setTime(int hourOfDay, int minute) {
        Calendar c = Calendar.getInstance();

        c.set(Calendar.HOUR_OF_DAY, hourOfDay);
        c.set(Calendar.MINUTE, minute);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        long when = c.getTimeInMillis();

        TimeDetector timeDetector = mContext.getSystemService(TimeDetector.class);
        ManualTimeSuggestion manualTimeSuggestion =
                TimeDetector.createManualTimeSuggestion(when, "Settings: Set time");
        boolean success = timeDetector.suggestManualTime(manualTimeSuggestion);
        if (!success) {
            // This implies the system server is applying tighter bounds than the settings app or
            // the date/time cannot be set for other reasons, e.g. perhaps "auto time" is turned on.
            Log.w(TAG, "Unable to set time with suggestion=" + manualTimeSuggestion);
        }
    }

    /**
     * Returns whether selecting the preference should prompt for the user to enter the date
     * manually. Exposed as public so that the time controller can easily share the same logic as
     * the rules are identical for time.
     */
    public boolean isEnabled() {
        TimeCapabilities timeZoneCapabilities =
                mTimeManager.getTimeCapabilitiesAndConfig().getCapabilities();
        int suggestManualTimeCapability = timeZoneCapabilities.getSetManualTimeCapability();
        return suggestManualTimeCapability == CAPABILITY_POSSESSED;
    }
}