/*
 * 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.keyguard;

import android.util.Log;
import android.view.LayoutInflater;

import androidx.annotation.Nullable;
import androidx.asynclayoutinflater.view.AsyncLayoutInflater;

import com.android.internal.annotations.VisibleForTesting;
import com.android.keyguard.KeyguardInputViewController.Factory;
import com.android.keyguard.KeyguardSecurityModel.SecurityMode;
import com.android.keyguard.dagger.KeyguardBouncerScope;
import com.android.systemui.R;
import com.android.systemui.flags.FeatureFlags;
import com.android.systemui.util.ViewController;

import java.util.ArrayList;
import java.util.List;

import javax.inject.Inject;

/**
 * Controller for a {@link KeyguardSecurityViewFlipper}.
 */
@KeyguardBouncerScope
public class KeyguardSecurityViewFlipperController
        extends ViewController<KeyguardSecurityViewFlipper> {

    private static final boolean DEBUG = KeyguardConstants.DEBUG;
    private static final String TAG = "KeyguardSecurityView";

    private final List<KeyguardInputViewController<KeyguardInputView>> mChildren =
            new ArrayList<>();
    private final LayoutInflater mLayoutInflater;
    private final AsyncLayoutInflater mAsyncLayoutInflater;
    private final EmergencyButtonController.Factory mEmergencyButtonControllerFactory;
    private final Factory mKeyguardSecurityViewControllerFactory;
    private final FeatureFlags mFeatureFlags;

    @Inject
    protected KeyguardSecurityViewFlipperController(KeyguardSecurityViewFlipper view,
            LayoutInflater layoutInflater,
            AsyncLayoutInflater asyncLayoutInflater,
            KeyguardInputViewController.Factory keyguardSecurityViewControllerFactory,
            EmergencyButtonController.Factory emergencyButtonControllerFactory,
            FeatureFlags featureFlags) {
        super(view);
        mKeyguardSecurityViewControllerFactory = keyguardSecurityViewControllerFactory;
        mLayoutInflater = layoutInflater;
        mEmergencyButtonControllerFactory = emergencyButtonControllerFactory;
        mAsyncLayoutInflater = asyncLayoutInflater;
        mFeatureFlags = featureFlags;
    }

    @Override
    protected void onViewAttached() {

    }

    @Override
    protected void onViewDetached() {

    }

    public void reset() {
        for (KeyguardInputViewController<KeyguardInputView> child : mChildren) {
            child.reset();
        }
    }

    /** Handles density or font scale changes. */
    public void clearViews() {
        mView.removeAllViews();
        mChildren.clear();
    }


    @VisibleForTesting
    void getSecurityView(SecurityMode securityMode,
            KeyguardSecurityCallback keyguardSecurityCallback,
            OnViewInflatedCallback onViewInflatedCallback) {
        for (KeyguardInputViewController<KeyguardInputView> child : mChildren) {
            if (child.getSecurityMode() == securityMode) {
                onViewInflatedCallback.onViewInflated(child);
                return;
            }
        }

        asynchronouslyInflateView(securityMode, keyguardSecurityCallback, onViewInflatedCallback);
    }

    /**
     * Asynchronously inflate view and then add it to view flipper on the main thread when complete.
     *
     * OnInflateFinishedListener will be called on the main thread.
     *
     * @param securityMode
     * @param keyguardSecurityCallback
     */
    public void asynchronouslyInflateView(SecurityMode securityMode,
            KeyguardSecurityCallback keyguardSecurityCallback,
            @Nullable OnViewInflatedCallback onViewInflatedListener) {
        int layoutId = getLayoutIdFor(securityMode);
        int viewID = getKeyguardInputViewId(securityMode);
        if (layoutId != 0 && viewID != 0) {
            if (DEBUG) {
                Log.v(TAG, "inflating on bg thread id = "
                        + layoutId + " . viewID = " + viewID);
            }
            mAsyncLayoutInflater.inflate(layoutId, mView,
                    (view, resId, parent) -> {
                        mView.addView(view);
                        KeyguardInputViewController<KeyguardInputView> childController =
                                mKeyguardSecurityViewControllerFactory.create(
                                        (KeyguardInputView) view.findViewById(viewID),
                                        securityMode, keyguardSecurityCallback);
                        childController.init();
                        mChildren.add(childController);
                        if (onViewInflatedListener != null) {
                            onViewInflatedListener.onViewInflated(childController);
                        }
                    });
        }
    }

    private int getLayoutIdFor(SecurityMode securityMode) {
        switch (securityMode) {
            case Pattern: return R.layout.keyguard_pattern_view;
            case PIN: return R.layout.keyguard_pin_view;
            case Password: return R.layout.keyguard_password_view;
            case SimPin: return R.layout.keyguard_sim_pin_view;
            case SimPuk: return R.layout.keyguard_sim_puk_view;
            default:
                return 0;
        }
    }

    private int getKeyguardInputViewId(SecurityMode securityMode) {
        //Keyguard Input View is not the root view of the layout, use these IDs for lookup.
        switch (securityMode) {
            case Pattern: return R.id.keyguard_pattern_view;
            case PIN: return R.id.keyguard_pin_view;
            case Password: return R.id.keyguard_password_view;
            case SimPin: return R.id.keyguard_sim_pin_view;
            case SimPuk: return R.id.keyguard_sim_puk_view;
            default:
                return 0;
        }
    }

    /** Makes the supplied child visible if it is contained win this view, */
    public void show(KeyguardInputViewController<KeyguardInputView> childController) {
        int index = childController.getIndexIn(mView);
        if (index != -1) {
            mView.setDisplayedChild(index);
        }
    }

    /** Listener to when view has finished inflation. */
    public interface OnViewInflatedCallback {
        /** Notifies that view has been inflated */
        void onViewInflated(KeyguardInputViewController<KeyguardInputView> controller);
    }
}