/*
 * Copyright (C) 2013 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.incallui;

import android.content.Context;
import android.os.Bundle;
import android.text.Editable;
import android.text.method.DialerKeyListener;
import android.util.ArrayMap;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnKeyListener;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.android.contacts.common.compat.PhoneNumberUtilsCompat;
import com.android.dialer.dialpadview.DialpadKeyButton;
import com.android.dialer.dialpadview.DialpadKeyButton.OnPressedListener;
import com.android.dialer.dialpadview.DialpadView;
import com.android.incallui.DialpadPresenter.DialpadUi;
import com.android.incallui.baseui.BaseFragment;
import java.util.Map;

/** Fragment for call control buttons */
public class DialpadFragment extends BaseFragment<DialpadPresenter, DialpadUi>
    implements DialpadUi, OnKeyListener, OnClickListener, OnPressedListener {

  /** Hash Map to map a view id to a character */
  private static final Map<Integer, Character> mDisplayMap = new ArrayMap<>();

  /** Set up the static maps */
  static {
    // Map the buttons to the display characters
    mDisplayMap.put(R.id.one, '1');
    mDisplayMap.put(R.id.two, '2');
    mDisplayMap.put(R.id.three, '3');
    mDisplayMap.put(R.id.four, '4');
    mDisplayMap.put(R.id.five, '5');
    mDisplayMap.put(R.id.six, '6');
    mDisplayMap.put(R.id.seven, '7');
    mDisplayMap.put(R.id.eight, '8');
    mDisplayMap.put(R.id.nine, '9');
    mDisplayMap.put(R.id.zero, '0');
    mDisplayMap.put(R.id.pound, '#');
    mDisplayMap.put(R.id.star, '*');
  }

  private final int[] mButtonIds =
      new int[] {
        R.id.zero,
        R.id.one,
        R.id.two,
        R.id.three,
        R.id.four,
        R.id.five,
        R.id.six,
        R.id.seven,
        R.id.eight,
        R.id.nine,
        R.id.star,
        R.id.pound
      };
  private EditText mDtmfDialerField;
  // KeyListener used with the "dialpad digits" EditText widget.
  private DTMFKeyListener mDialerKeyListener;
  private DialpadView mDialpadView;
  private int mCurrentTextColor;

  @Override
  public void onClick(View v) {
    if (v.getId() == R.id.dialpad_back) {
      getActivity().onBackPressed();
    }
  }

  @Override
  public boolean onKey(View v, int keyCode, KeyEvent event) {
    Log.d(this, "onKey:  keyCode " + keyCode + ", view " + v);

    if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER || keyCode == KeyEvent.KEYCODE_ENTER) {
      int viewId = v.getId();
      if (mDisplayMap.containsKey(viewId)) {
        switch (event.getAction()) {
          case KeyEvent.ACTION_DOWN:
            if (event.getRepeatCount() == 0) {
              getPresenter().processDtmf(mDisplayMap.get(viewId));
            }
            break;
          case KeyEvent.ACTION_UP:
            getPresenter().stopDtmf();
            break;
        }
        // do not return true [handled] here, since we want the
        // press / click animation to be handled by the framework.
      }
    }
    return false;
  }

  @Override
  public DialpadPresenter createPresenter() {
    return new DialpadPresenter();
  }

  @Override
  public DialpadPresenter.DialpadUi getUi() {
    return this;
  }

  // TODO Adds hardware keyboard listener

  @Override
  public View onCreateView(
      LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    final View parent = inflater.inflate(R.layout.incall_dialpad_fragment, container, false);
    mDialpadView = (DialpadView) parent.findViewById(R.id.dialpad_view);
    mDialpadView.setCanDigitsBeEdited(false);
    mDialpadView.setBackgroundResource(R.color.incall_dialpad_background);
    mDtmfDialerField = (EditText) parent.findViewById(R.id.digits);
    if (mDtmfDialerField != null) {
      mDialerKeyListener = new DTMFKeyListener();
      mDtmfDialerField.setKeyListener(mDialerKeyListener);
      // remove the long-press context menus that support
      // the edit (copy / paste / select) functions.
      mDtmfDialerField.setLongClickable(false);
      mDtmfDialerField.setElegantTextHeight(false);
      configureKeypadListeners();
    }
    View backButton = mDialpadView.findViewById(R.id.dialpad_back);
    backButton.setVisibility(View.VISIBLE);
    backButton.setOnClickListener(this);

    return parent;
  }

  @Override
  public void onResume() {
    super.onResume();
    updateColors();
  }

  public void updateColors() {
    int textColor = InCallPresenter.getInstance().getThemeColorManager().getPrimaryColor();

    if (mCurrentTextColor == textColor) {
      return;
    }

    DialpadKeyButton dialpadKey;
    for (int i = 0; i < mButtonIds.length; i++) {
      dialpadKey = (DialpadKeyButton) mDialpadView.findViewById(mButtonIds[i]);
      ((TextView) dialpadKey.findViewById(R.id.dialpad_key_number)).setTextColor(textColor);
    }

    mCurrentTextColor = textColor;
  }

  @Override
  public void onDestroyView() {
    mDialerKeyListener = null;
    super.onDestroyView();
  }

  /**
   * Getter for Dialpad text.
   *
   * @return String containing current Dialpad EditText text.
   */
  public String getDtmfText() {
    return mDtmfDialerField.getText().toString();
  }

  /**
   * Sets the Dialpad text field with some text.
   *
   * @param text Text to set Dialpad EditText to.
   */
  public void setDtmfText(String text) {
    mDtmfDialerField.setText(PhoneNumberUtilsCompat.createTtsSpannable(text));
  }

  @Override
  public void setVisible(boolean on) {
    if (on) {
      getView().setVisibility(View.VISIBLE);
    } else {
      getView().setVisibility(View.INVISIBLE);
    }
  }

  /** Starts the slide up animation for the Dialpad keys when the Dialpad is revealed. */
  public void animateShowDialpad() {
    final DialpadView dialpadView = (DialpadView) getView().findViewById(R.id.dialpad_view);
    dialpadView.animateShow();
  }

  @Override
  public void appendDigitsToField(char digit) {
    if (mDtmfDialerField != null) {
      // TODO: maybe *don't* manually append this digit if
      // mDialpadDigits is focused and this key came from the HW
      // keyboard, since in that case the EditText field will
      // get the key event directly and automatically appends
      // whetever the user types.
      // (Or, a cleaner fix would be to just make mDialpadDigits
      // *not* handle HW key presses.  That seems to be more
      // complicated than just setting focusable="false" on it,
      // though.)
      mDtmfDialerField.getText().append(digit);
    }
  }

  /** Called externally (from InCallScreen) to play a DTMF Tone. */
  /* package */ boolean onDialerKeyDown(KeyEvent event) {
    Log.d(this, "Notifying dtmf key down.");
    if (mDialerKeyListener != null) {
      return mDialerKeyListener.onKeyDown(event);
    } else {
      return false;
    }
  }

  /** Called externally (from InCallScreen) to cancel the last DTMF Tone played. */
  public boolean onDialerKeyUp(KeyEvent event) {
    Log.d(this, "Notifying dtmf key up.");
    if (mDialerKeyListener != null) {
      return mDialerKeyListener.onKeyUp(event);
    } else {
      return false;
    }
  }

  private void configureKeypadListeners() {
    DialpadKeyButton dialpadKey;
    for (int i = 0; i < mButtonIds.length; i++) {
      dialpadKey = (DialpadKeyButton) mDialpadView.findViewById(mButtonIds[i]);
      dialpadKey.setOnKeyListener(this);
      dialpadKey.setOnClickListener(this);
      dialpadKey.setOnPressedListener(this);
    }
  }

  @Override
  public void onPressed(View view, boolean pressed) {
    if (pressed && mDisplayMap.containsKey(view.getId())) {
      Log.d(this, "onPressed: " + pressed + " " + mDisplayMap.get(view.getId()));
      getPresenter().processDtmf(mDisplayMap.get(view.getId()));
    }
    if (!pressed) {
      Log.d(this, "onPressed: " + pressed);
      getPresenter().stopDtmf();
    }
  }

  /**
   * LinearLayout with getter and setter methods for the translationY property using floats, for
   * animation purposes.
   */
  public static class DialpadSlidingLinearLayout extends LinearLayout {

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

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

    public DialpadSlidingLinearLayout(Context context, AttributeSet attrs, int defStyle) {
      super(context, attrs, defStyle);
    }

    public float getYFraction() {
      final int height = getHeight();
      if (height == 0) {
        return 0;
      }
      return getTranslationY() / height;
    }

    public void setYFraction(float yFraction) {
      setTranslationY(yFraction * getHeight());
    }
  }

  /**
   * Our own key listener, specialized for dealing with DTMF codes. 1. Ignore the backspace since it
   * is irrelevant. 2. Allow ONLY valid DTMF characters to generate a tone and be sent as a DTMF
   * code. 3. All other remaining characters are handled by the superclass.
   *
   * <p>This code is purely here to handle events from the hardware keyboard while the DTMF dialpad
   * is up.
   */
  private class DTMFKeyListener extends DialerKeyListener {

    /**
     * Overrides the characters used in {@link DialerKeyListener#CHARACTERS} These are the valid
     * dtmf characters.
     */
    public final char[] DTMF_CHARACTERS =
        new char[] {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '#', '*'};

    private DTMFKeyListener() {
      super();
    }

    /** Overriden to return correct DTMF-dialable characters. */
    @Override
    protected char[] getAcceptedChars() {
      return DTMF_CHARACTERS;
    }

    /** special key listener ignores backspace. */
    @Override
    public boolean backspace(View view, Editable content, int keyCode, KeyEvent event) {
      return false;
    }

    /**
     * Overriden so that with each valid button press, we start sending a dtmf code and play a local
     * dtmf tone.
     */
    @Override
    public boolean onKeyDown(View view, Editable content, int keyCode, KeyEvent event) {
      // if (DBG) log("DTMFKeyListener.onKeyDown, keyCode " + keyCode + ", view " + view);

      // find the character
      char c = (char) lookup(event, content);

      // if not a long press, and parent onKeyDown accepts the input
      if (event.getRepeatCount() == 0 && super.onKeyDown(view, content, keyCode, event)) {

        boolean keyOK = ok(getAcceptedChars(), c);

        // if the character is a valid dtmf code, start playing the tone and send the
        // code.
        if (keyOK) {
          Log.d(this, "DTMFKeyListener reading '" + c + "' from input.");
          getPresenter().processDtmf(c);
        } else {
          Log.d(this, "DTMFKeyListener rejecting '" + c + "' from input.");
        }
        return true;
      }
      return false;
    }

    /**
     * Overriden so that with each valid button up, we stop sending a dtmf code and the dtmf tone.
     */
    @Override
    public boolean onKeyUp(View view, Editable content, int keyCode, KeyEvent event) {
      // if (DBG) log("DTMFKeyListener.onKeyUp, keyCode " + keyCode + ", view " + view);

      super.onKeyUp(view, content, keyCode, event);

      // find the character
      char c = (char) lookup(event, content);

      boolean keyOK = ok(getAcceptedChars(), c);

      if (keyOK) {
        Log.d(this, "Stopping the tone for '" + c + "'");
        getPresenter().stopDtmf();
        return true;
      }

      return false;
    }

    /** Handle individual keydown events when we DO NOT have an Editable handy. */
    public boolean onKeyDown(KeyEvent event) {
      char c = lookup(event);
      Log.d(this, "DTMFKeyListener.onKeyDown: event '" + c + "'");

      // if not a long press, and parent onKeyDown accepts the input
      if (event.getRepeatCount() == 0 && c != 0) {
        // if the character is a valid dtmf code, start playing the tone and send the
        // code.
        if (ok(getAcceptedChars(), c)) {
          Log.d(this, "DTMFKeyListener reading '" + c + "' from input.");
          getPresenter().processDtmf(c);
          return true;
        } else {
          Log.d(this, "DTMFKeyListener rejecting '" + c + "' from input.");
        }
      }
      return false;
    }

    /**
     * Handle individual keyup events.
     *
     * @param event is the event we are trying to stop. If this is null, then we just force-stop the
     *     last tone without checking if the event is an acceptable dialer event.
     */
    public boolean onKeyUp(KeyEvent event) {
      if (event == null) {
        //the below piece of code sends stopDTMF event unnecessarily even when a null event
        //is received, hence commenting it.
        /*if (DBG) log("Stopping the last played tone.");
        stopTone();*/
        return true;
      }

      char c = lookup(event);
      Log.d(this, "DTMFKeyListener.onKeyUp: event '" + c + "'");

      // TODO: stopTone does not take in character input, we may want to
      // consider checking for this ourselves.
      if (ok(getAcceptedChars(), c)) {
        Log.d(this, "Stopping the tone for '" + c + "'");
        getPresenter().stopDtmf();
        return true;
      }

      return false;
    }

    /**
     * Find the Dialer Key mapped to this event.
     *
     * @return The char value of the input event, otherwise 0 if no matching character was found.
     */
    private char lookup(KeyEvent event) {
      // This code is similar to {@link DialerKeyListener#lookup(KeyEvent, Spannable) lookup}
      int meta = event.getMetaState();
      int number = event.getNumber();

      if (!((meta & (KeyEvent.META_ALT_ON | KeyEvent.META_SHIFT_ON)) == 0) || (number == 0)) {
        int match = event.getMatch(getAcceptedChars(), meta);
        number = (match != 0) ? match : number;
      }

      return (char) number;
    }

    /** Check to see if the keyEvent is dialable. */
    boolean isKeyEventAcceptable(KeyEvent event) {
      return (ok(getAcceptedChars(), lookup(event)));
    }
  }
}