/*
 * Copyright 2017 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 androidx.slice.widget;

import android.animation.Animator;
import android.app.PendingIntent;
import android.app.RemoteInput;
import android.content.Context;
import android.content.Intent;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.util.Log;
import android.view.ActionMode;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewAnimationUtils;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;
import android.view.inputmethod.CompletionInfo;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.RequiresApi;
import androidx.annotation.RestrictTo;
import androidx.core.content.ContextCompat;
import androidx.core.widget.TextViewCompat;
import androidx.slice.SliceItem;
import androidx.slice.view.R;

/**
 * Host for the remote input.
 *
 * @hide
 */
// TODO this should be unified with SystemUI RemoteInputView (b/67527720)
@RestrictTo(RestrictTo.Scope.LIBRARY)
@RequiresApi(21)
public class RemoteInputView extends LinearLayout implements View.OnClickListener, TextWatcher {

    private static final String TAG = "RemoteInput";

    /**
     * A marker object that let's us easily find views of this class.
     */
    public static final Object VIEW_TAG = new Object();

    RemoteEditText mEditText;
    private ImageButton mSendButton;
    private ProgressBar mProgressBar;
    private SliceItem mAction;
    private RemoteInput[] mRemoteInputs;
    private RemoteInput mRemoteInput;

    private int mRevealCx;
    private int mRevealCy;
    private int mRevealR;
    private boolean mResetting;

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

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();

        mProgressBar = findViewById(R.id.remote_input_progress);
        mSendButton = findViewById(R.id.remote_input_send);
        mSendButton.setOnClickListener(this);

        mEditText = (RemoteEditText) getChildAt(0);
        mEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                final boolean isSoftImeEvent = event == null
                        && (actionId == EditorInfo.IME_ACTION_DONE
                                || actionId == EditorInfo.IME_ACTION_NEXT
                                || actionId == EditorInfo.IME_ACTION_SEND);
                final boolean isKeyboardEnterKey = event != null
                        && isConfirmKey(event.getKeyCode())
                        && event.getAction() == KeyEvent.ACTION_DOWN;

                if (isSoftImeEvent || isKeyboardEnterKey) {
                    if (mEditText.length() > 0) {
                        sendRemoteInput();
                    }
                    // Consume action to prevent IME from closing.
                    return true;
                }
                return false;
            }
        });
        mEditText.addTextChangedListener(this);
        mEditText.setInnerFocusable(false);
        mEditText.mRemoteInputView = this;
    }

    void sendRemoteInput() {
        Bundle results = new Bundle();
        results.putString(mRemoteInput.getResultKey(), mEditText.getText().toString());
        Intent fillInIntent = new Intent().addFlags(Intent.FLAG_RECEIVER_FOREGROUND);
        RemoteInput.addResultsToIntent(mRemoteInputs, fillInIntent,
                results);

        mEditText.setEnabled(false);
        mSendButton.setVisibility(INVISIBLE);
        mProgressBar.setVisibility(VISIBLE);
        mEditText.mShowImeOnInputConnection = false;

        // TODO: Figure out API for telling the system about slice interaction.
        // Tell ShortcutManager that this package has been "activated".  ShortcutManager
        // will reset the throttling for this package.
        // Strictly speaking, the intent receiver may be different from the intent creator,
        // but that's an edge case, and also because we can't always know which package will receive
        // an intent, so we just reset for the creator.
        //getContext().getSystemService(ShortcutManager.class).onApplicationActive(
        //        mAction.getCreatorPackage(),
        //        getContext().getUserId());

        try {
            mAction.fireAction(getContext(), fillInIntent);
            reset();
        } catch (PendingIntent.CanceledException e) {
            Log.i(TAG, "Unable to send remote input result", e);
            Toast.makeText(getContext(), "Failure sending pending intent for inline reply :(",
                    Toast.LENGTH_SHORT).show();
            reset();
        }
    }

    /**
     * Creates a remote input view.
     */
    public static RemoteInputView inflate(Context context, ViewGroup root) {
        RemoteInputView v = (RemoteInputView) LayoutInflater.from(context).inflate(
                R.layout.abc_slice_remote_input, root, false);
        v.setTag(VIEW_TAG);
        return v;
    }

    @Override
    public void onClick(View v) {
        if (v == mSendButton) {
            sendRemoteInput();
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        super.onTouchEvent(event);

        // We never want for a touch to escape to an outer view or one we covered.
        return true;
    }

    void onDefocus() {
        setVisibility(INVISIBLE);
    }

    /**
     * Set the pending intent for remote input.
     */
    public void setAction(SliceItem action) {
        mAction = action;
    }

    /**
     * Set the remote inputs for this view.
     */
    public void setRemoteInput(RemoteInput[] remoteInputs, RemoteInput remoteInput) {
        mRemoteInputs = remoteInputs;
        mRemoteInput = remoteInput;
        mEditText.setHint(mRemoteInput.getLabel());
    }

    /**
     * Focuses the remote input view.
     */
    public void focusAnimated() {
        if (getVisibility() != VISIBLE) {
            Animator animator = ViewAnimationUtils.createCircularReveal(
                    this, mRevealCx, mRevealCy, 0, mRevealR);
            animator.setDuration(200);
            animator.start();
        }
        focus();
    }

    private void focus() {
        setVisibility(VISIBLE);
        mEditText.setInnerFocusable(true);
        mEditText.mShowImeOnInputConnection = true;
        mEditText.setSelection(mEditText.getText().length());
        mEditText.requestFocus();
        updateSendButton();
    }

    private void reset() {
        mResetting = true;

        mEditText.getText().clear();
        mEditText.setEnabled(true);
        mSendButton.setVisibility(VISIBLE);
        mProgressBar.setVisibility(INVISIBLE);
        updateSendButton();
        onDefocus();

        mResetting = false;
    }

    @Override
    public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) {
        if (mResetting && child == mEditText) {
            // Suppress text events if it happens during resetting. Ideally this would be
            // suppressed by the text view not being shown, but that doesn't work here because it
            // needs to stay visible for the animation.
            return false;
        }
        return super.onRequestSendAccessibilityEvent(child, event);
    }

    private void updateSendButton() {
        mSendButton.setEnabled(mEditText.getText().length() != 0);
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
    }

    @Override
    public void afterTextChanged(Editable s) {
        updateSendButton();
    }

    /**
     * @hide
     */
    @RestrictTo(RestrictTo.Scope.LIBRARY)
    public void setRevealParameters(int cx, int cy, int r) {
        mRevealCx = cx;
        mRevealCy = cy;
        mRevealR = r;
    }

    @Override
    public void dispatchStartTemporaryDetach() {
        super.dispatchStartTemporaryDetach();
        // Detach the EditText temporarily such that it doesn't get onDetachedFromWindow and
        // won't lose IME focus.
        detachViewFromParent(mEditText);
    }

    @Override
    public void dispatchFinishTemporaryDetach() {
        if (isAttachedToWindow()) {
            attachViewToParent(mEditText, 0, mEditText.getLayoutParams());
        } else {
            removeDetachedView(mEditText, false /* animate */);
        }
        super.dispatchFinishTemporaryDetach();
    }

    /**
     * An EditText that changes appearance based on whether it's focusable and becomes un-focusable
     * whenever the user navigates away from it or it becomes invisible.
     */
    public static class RemoteEditText extends EditText {

        private final Drawable mBackground;
        RemoteInputView mRemoteInputView;
        boolean mShowImeOnInputConnection;

        public RemoteEditText(Context context, AttributeSet attrs) {
            super(context, attrs);
            mBackground = getBackground();
        }

        private void defocusIfNeeded() {
            if (mRemoteInputView != null || isTemporarilyDetachedCompat()) {
                if (isTemporarilyDetachedCompat()) {
                    // We might get reattached but then the other one of HUN / expanded might steal
                    // our focus, so we'll need to save our text here.
                }
                return;
            }
            if (isFocusable() && isEnabled()) {
                setInnerFocusable(false);
                if (mRemoteInputView != null) {
                    mRemoteInputView.onDefocus();
                }
                mShowImeOnInputConnection = false;
            }
        }

        private boolean isTemporarilyDetachedCompat() {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                return isTemporarilyDetached();
            }
            return false;
        }

        @Override
        protected void onVisibilityChanged(View changedView, int visibility) {
            super.onVisibilityChanged(changedView, visibility);

            if (!isShown()) {
                defocusIfNeeded();
            }
        }

        @Override
        protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
            super.onFocusChanged(focused, direction, previouslyFocusedRect);
            if (!focused) {
                defocusIfNeeded();
            }
        }

        @Override
        public void getFocusedRect(Rect r) {
            super.getFocusedRect(r);
            r.top = getScrollY();
            r.bottom = getScrollY() + (getBottom() - getTop());
        }

        @Override
        public boolean onKeyDown(int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_BACK) {
                // Eat the DOWN event here to prevent any default behavior.
                return true;
            }
            return super.onKeyDown(keyCode, event);
        }

        @Override
        public boolean onKeyUp(int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_BACK) {
                defocusIfNeeded();
                return true;
            }
            return super.onKeyUp(keyCode, event);
        }

        @Override
        public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
            final InputConnection inputConnection = super.onCreateInputConnection(outAttrs);

            if (mShowImeOnInputConnection && inputConnection != null) {
                final InputMethodManager imm = ContextCompat.getSystemService(getContext(),
                        InputMethodManager.class);
                if (imm != null) {
                    // onCreateInputConnection is called by InputMethodManager in the middle of
                    // setting up the connection to the IME; wait with requesting the IME until that
                    // work has completed.
                    post(new Runnable() {
                        @Override
                        public void run() {
                            imm.viewClicked(RemoteEditText.this);
                            imm.showSoftInput(RemoteEditText.this, 0);
                        }
                    });
                }
            }

            return inputConnection;
        }

        @Override
        public void onCommitCompletion(CompletionInfo text) {
            clearComposingText();
            setText(text.getText());
            setSelection(getText().length());
        }

        void setInnerFocusable(boolean focusable) {
            setFocusableInTouchMode(focusable);
            setFocusable(focusable);
            setCursorVisible(focusable);

            if (focusable) {
                requestFocus();
                setBackground(mBackground);
            } else {
                setBackground(null);
            }

        }

        /**
         * See
         * {@link TextViewCompat
         * #setCustomSelectionActionModeCallback(TextView, ActionMode.Callback)}
         */
        @Override
        public void setCustomSelectionActionModeCallback(ActionMode.Callback actionModeCallback) {
            super.setCustomSelectionActionModeCallback(TextViewCompat
                    .wrapCustomSelectionActionModeCallback(this, actionModeCallback));
        }
    }

    /** Whether key will, by default, trigger a click on the focused view.
     * @hide
     */
    @RestrictTo(RestrictTo.Scope.LIBRARY)
    public static final boolean isConfirmKey(int keyCode) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_DPAD_CENTER:
            case KeyEvent.KEYCODE_ENTER:
            case KeyEvent.KEYCODE_SPACE:
            case KeyEvent.KEYCODE_NUMPAD_ENTER:
                return true;
            default:
                return false;
        }
    }
}