/*
 * Copyright (C) 2019 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.car.settings.datausage;

import static android.net.NetworkPolicy.LIMIT_DISABLED;
import static android.net.NetworkPolicy.WARNING_DISABLED;

import android.car.drivingstate.CarUxRestrictions;
import android.content.Context;
import android.os.Bundle;

import androidx.annotation.Nullable;
import androidx.annotation.VisibleForTesting;
import androidx.preference.Preference;
import androidx.preference.PreferenceGroup;
import androidx.preference.TwoStatePreference;

import com.android.car.settings.R;
import com.android.car.settings.common.ConfirmationDialogFragment;
import com.android.car.settings.common.FragmentController;
import com.android.car.settings.datausage.UsageBytesThresholdPickerDialog.BytesThresholdPickedListener;

/** Controls setting the data limit threshold. */
public class DataLimitPreferenceController extends
        DataWarningAndLimitBasePreferenceController<PreferenceGroup> implements
        Preference.OnPreferenceChangeListener, ConfirmationDialogFragment.ConfirmListener,
        Preference.OnPreferenceClickListener {

    @VisibleForTesting
    static final float LIMIT_BYTES_MULTIPLIER = 1.2f;
    private static final long GIB_IN_BYTES = 1024 * 1024 * 1024;

    private final BytesThresholdPickedListener mThresholdPickedListener = numBytes -> {
        getNetworkPolicyEditor().setPolicyLimitBytes(getNetworkTemplate(), numBytes);
        refreshUi();
    };

    private TwoStatePreference mEnableDataLimitPreference;
    private Preference mSetDataLimitPreference;

    public DataLimitPreferenceController(Context context, String preferenceKey,
            FragmentController fragmentController, CarUxRestrictions uxRestrictions) {
        super(context, preferenceKey, fragmentController, uxRestrictions);
    }

    @Override
    protected Class<PreferenceGroup> getPreferenceType() {
        return PreferenceGroup.class;
    }

    @Override
    protected void onCreateInternal() {
        mEnableDataLimitPreference = (TwoStatePreference) getPreference().findPreference(
                getContext().getString(R.string.pk_data_set_limit));
        mEnableDataLimitPreference.setOnPreferenceChangeListener(this);
        mSetDataLimitPreference = getPreference().findPreference(
                getContext().getString(R.string.pk_data_limit));
        mSetDataLimitPreference.setOnPreferenceClickListener(this);

        ConfirmationDialogFragment.resetListeners(
                (ConfirmationDialogFragment) getFragmentController().findDialogByTag(
                        ConfirmationDialogFragment.TAG),
                /* confirmListener= */ this,
                /* rejectListener= */ null,
                /* neutralListener= */ null);

        UsageBytesThresholdPickerDialog dialog =
                (UsageBytesThresholdPickerDialog) getFragmentController().findDialogByTag(
                        UsageBytesThresholdPickerDialog.TAG);
        if (dialog != null) {
            dialog.setBytesThresholdPickedListener(mThresholdPickedListener);
        }
    }

    @Override
    protected void updateState(PreferenceGroup preference) {
        long limitBytes = getNetworkPolicyEditor().getPolicyLimitBytes(getNetworkTemplate());

        if (limitBytes == LIMIT_DISABLED) {
            mEnableDataLimitPreference.setChecked(false);
            mSetDataLimitPreference.setSummary(null);
        } else {
            mEnableDataLimitPreference.setChecked(true);
            mSetDataLimitPreference.setSummary(
                    DataUsageUtils.bytesToIecUnits(getContext(), limitBytes));
        }
        mSetDataLimitPreference.setEnabled(mEnableDataLimitPreference.isChecked());
    }

    @Override
    public boolean onPreferenceChange(Preference preference, Object newValue) {
        boolean enabled = (Boolean) newValue;
        if (!enabled) {
            getNetworkPolicyEditor().setPolicyLimitBytes(getNetworkTemplate(), LIMIT_DISABLED);
            refreshUi();
            return true;
        }

        ConfirmationDialogFragment dialogFragment =
                new ConfirmationDialogFragment.Builder(getContext())
                        .setTitle(R.string.data_usage_limit_dialog_title)
                        .setMessage(R.string.data_usage_limit_dialog_mobile)
                        .setPositiveButton(android.R.string.ok, this)
                        .setNegativeButton(android.R.string.cancel, null)
                        .build();
        getFragmentController().showDialog(dialogFragment, ConfirmationDialogFragment.TAG);

        // This preference is enabled / disabled by ConfirmationDialogFragment.
        return false;
    }

    @Override
    public void onConfirm(@Nullable Bundle arguments) {
        long warningBytes = getNetworkPolicyEditor().getPolicyWarningBytes(getNetworkTemplate());
        long minLimitBytes = 0;
        if (warningBytes != WARNING_DISABLED) {
            minLimitBytes = (long) (warningBytes * LIMIT_BYTES_MULTIPLIER);
        }

        long limitBytes = Math.max(5 * GIB_IN_BYTES, minLimitBytes);

        getNetworkPolicyEditor().setPolicyLimitBytes(getNetworkTemplate(), limitBytes);
        refreshUi();
    }

    @Override
    public boolean onPreferenceClick(Preference preference) {
        UsageBytesThresholdPickerDialog dialog = UsageBytesThresholdPickerDialog.newInstance(
                R.string.data_usage_limit_editor_title,
                getNetworkPolicyEditor().getPolicyLimitBytes(getNetworkTemplate()));
        dialog.setBytesThresholdPickedListener(mThresholdPickedListener);
        getFragmentController().showDialog(dialog, UsageBytesThresholdPickerDialog.TAG);
        return true;
    }
}