/*
 * Copyright (C) 2020 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.accessibility;

import static android.content.Context.MODE_PRIVATE;

import static com.android.settings.accessibility.AutoclickUtils.AUTOCLICK_DELAY_STEP;
import static com.android.settings.accessibility.AutoclickUtils.KEY_CUSTOM_DELAY_VALUE;
import static com.android.settings.accessibility.AutoclickUtils.KEY_DELAY_MODE;
import static com.android.settings.accessibility.AutoclickUtils.MAX_AUTOCLICK_DELAY_MS;
import static com.android.settings.accessibility.AutoclickUtils.MIN_AUTOCLICK_DELAY_MS;

import android.content.ContentResolver;
import android.content.Context;
import android.content.SharedPreferences;
import android.provider.Settings;
import android.view.accessibility.AccessibilityManager;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.TextView;

import androidx.annotation.VisibleForTesting;
import androidx.preference.PreferenceScreen;

import com.android.settings.R;
import com.android.settings.core.BasePreferenceController;
import com.android.settingslib.core.lifecycle.LifecycleObserver;
import com.android.settingslib.core.lifecycle.events.OnStart;
import com.android.settingslib.core.lifecycle.events.OnStop;
import com.android.settingslib.widget.LayoutPreference;

/** Controller class that controls accessibility autoclick seekbar settings. */
public class ToggleAutoclickCustomSeekbarController extends BasePreferenceController
        implements LifecycleObserver, OnStart, OnStop,
        SharedPreferences.OnSharedPreferenceChangeListener {

    private final SharedPreferences mSharedPreferences;
    private final ContentResolver mContentResolver;
    private ImageView mShorter;
    private ImageView mLonger;
    private SeekBar mSeekBar;
    private TextView mDelayLabel;

    @VisibleForTesting
    final SeekBar.OnSeekBarChangeListener mSeekBarChangeListener =
            new SeekBar.OnSeekBarChangeListener() {

                @Override
                public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                    updateCustomDelayValue(seekBarProgressToDelay(progress));
                }

                @Override
                public void onStartTrackingTouch(SeekBar seekBar) {
                    // Nothing to do.
                }

                @Override
                public void onStopTrackingTouch(SeekBar seekBar) {
                    // Nothing to do.
                }
            };

    public ToggleAutoclickCustomSeekbarController(Context context, String preferenceKey) {
        super(context, preferenceKey);
        mSharedPreferences = context.getSharedPreferences(context.getPackageName(), MODE_PRIVATE);
        mContentResolver = context.getContentResolver();
    }

    @Override
    public int getAvailabilityStatus() {
        return AVAILABLE;
    }

    @Override
    public void onStart() {
        if (mSharedPreferences != null) {
            mSharedPreferences.registerOnSharedPreferenceChangeListener(this);
        }
    }

    @Override
    public void onStop() {
        if (mSharedPreferences != null) {
            mSharedPreferences.unregisterOnSharedPreferenceChangeListener(this);
        }
    }

    @Override
    public void displayPreference(PreferenceScreen screen) {
        super.displayPreference(screen);
        final LayoutPreference preference = screen.findPreference(getPreferenceKey());

        if (isAvailable()) {
            final int delayMillis = getSharedPreferenceForDelayValue();
            // Initialize seek bar preference. Sets seek bar size to the number of possible delay
            // values.
            mSeekBar = preference.findViewById(R.id.autoclick_delay);
            mSeekBar.setMax(delayToSeekBarProgress(MAX_AUTOCLICK_DELAY_MS));
            mSeekBar.setProgress(delayToSeekBarProgress(delayMillis));
            mSeekBar.setOnSeekBarChangeListener(mSeekBarChangeListener);

            mDelayLabel = preference.findViewById(R.id.current_label);
            mDelayLabel.setText(delayTimeToString(delayMillis));

            mShorter = preference.findViewById(R.id.shorter);
            mShorter.setOnClickListener(v -> minusDelayByImageView());

            mLonger = preference.findViewById(R.id.longer);
            mLonger.setOnClickListener(v -> plusDelayByImageView());
        }
    }

    @Override
    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
        if (KEY_DELAY_MODE.equals(key)) {
            final int delayMillis = getSharedPreferenceForDelayValue();
            updateCustomDelayValue(delayMillis);
        }
    }

    /** Converts seek bar preference progress value to autoclick delay associated with it. */
    private int seekBarProgressToDelay(int progress) {
        return progress * AUTOCLICK_DELAY_STEP + MIN_AUTOCLICK_DELAY_MS;
    }

    /**
     * Converts autoclick delay value to seek bar preference progress values that represents said
     * delay.
     */
    private int delayToSeekBarProgress(int delayMillis) {
        return (delayMillis - MIN_AUTOCLICK_DELAY_MS) / AUTOCLICK_DELAY_STEP;
    }

    private int getSharedPreferenceForDelayValue() {
        final int delayMillis = Settings.Secure.getInt(mContentResolver,
                Settings.Secure.ACCESSIBILITY_AUTOCLICK_DELAY,
                AccessibilityManager.AUTOCLICK_DELAY_DEFAULT);

        return mSharedPreferences.getInt(KEY_CUSTOM_DELAY_VALUE, delayMillis);
    }

    private void updateCustomDelayValue(int delayMillis) {
        Settings.Secure.putInt(mContentResolver, Settings.Secure.ACCESSIBILITY_AUTOCLICK_DELAY,
                delayMillis);
        mSharedPreferences.edit().putInt(KEY_CUSTOM_DELAY_VALUE, delayMillis).apply();
        mSeekBar.setProgress(delayToSeekBarProgress(delayMillis));
        mDelayLabel.setText(delayTimeToString(delayMillis));
    }

    private void minusDelayByImageView() {
        final int delayMillis = getSharedPreferenceForDelayValue();
        if (delayMillis > MIN_AUTOCLICK_DELAY_MS) {
            updateCustomDelayValue(delayMillis - AUTOCLICK_DELAY_STEP);
        }
    }

    private void plusDelayByImageView() {
        final int delayMillis = getSharedPreferenceForDelayValue();
        if (delayMillis < MAX_AUTOCLICK_DELAY_MS) {
            updateCustomDelayValue(delayMillis + AUTOCLICK_DELAY_STEP);
        }
    }
    private CharSequence delayTimeToString(int delayMillis) {
        return AutoclickUtils.getAutoclickDelaySummary(mContext,
                R.string.accessibilty_autoclick_delay_unit_second, delayMillis);
    }
}