/*
 * Copyright (C) 2022 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.permissioncontroller.safetycenter.ui;

import static android.os.Build.VERSION_CODES.TIRAMISU;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.RequiresApi;
import androidx.fragment.app.Fragment;
import androidx.preference.PreferenceViewHolder;
import androidx.preference.SwitchPreference;

import com.android.permissioncontroller.R;
import com.android.permissioncontroller.safetycenter.ui.model.PrivacyControlsViewModel;
import com.android.permissioncontroller.safetycenter.ui.model.PrivacyControlsViewModel.Pref;
import com.android.permissioncontroller.safetycenter.ui.model.PrivacyControlsViewModel.PrefState;

/**
 * A preference that can be set to appear disabled, but remain clickable. However, the setChecked
 * method will not register any changes while it appears disabled.
 */
@RequiresApi(TIRAMISU)
public class ClickableDisabledSwitchPreference extends SwitchPreference {

    private boolean mAppearDisabled;

    public ClickableDisabledSwitchPreference(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public ClickableDisabledSwitchPreference(Context context) {
        super(context);
    }

    @Override
    public void onBindViewHolder(PreferenceViewHolder holder) {
        super.onBindViewHolder(holder);
        if (holder.itemView instanceof ViewGroup) {
            applyEnableStateToChildren((ViewGroup) holder.itemView);
        }
    }

    @Override
    public void setChecked(boolean checked) {
        if (mAppearDisabled) {
            return;
        }
        super.setChecked(checked);
    }

    /**
     * Set this preference to appear disabled. It will remain clickable, but will be frozen in its
     * current checked state.
     */
    private void setAppearDisabled(boolean appearDisabled) {
        if (appearDisabled == mAppearDisabled) {
            return;
        }
        mAppearDisabled = appearDisabled;
        notifyChanged();
    }

    private void applyEnableStateToChildren(ViewGroup viewGroup) {
        for (int i = 0; i < viewGroup.getChildCount(); i++) {
            View child = viewGroup.getChildAt(i);
            child.setEnabled(!mAppearDisabled);
            if (child instanceof ViewGroup) {
                applyEnableStateToChildren((ViewGroup) child);
            }
        }
    }

    /**
     * Sets the state of this switch preference based on restrictions enforced by the admin
     *
     * @param prefState a map of the preferences and their current toggle state
     * @param prefType represents the type of privacy control toggle
     * @param viewModel model used to talk to the backing service
     * @param fragment represents the fragment containing this preference
     */
    public void setupState(
            PrefState prefState,
            Pref prefType,
            PrivacyControlsViewModel viewModel,
            Fragment fragment) {
        setVisible(prefState.getVisible());
        setChecked(prefState.getChecked());
        setAppearDisabled(prefState.getAdmin() != null);
        setOnPreferenceClickListener(
                (v) -> {
                    viewModel.handlePrefClick(fragment, prefType, prefState.getAdmin());
                    return true;
                });

        if (prefState.getAdmin() != null && prefState.getChecked()) {
            setSummary(R.string.enabled_by_admin);
        } else if (prefState.getAdmin() != null) {
            setSummary(R.string.disabled_by_admin);
        } else if (prefType.equals(Pref.MIC)) {
            setSummary(R.string.mic_toggle_description);
        } else if (prefType.equals(Pref.CAMERA)) {
            setSummary(R.string.perm_toggle_description);
        }
    }
}