/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.gecko;

import android.content.Context;
import android.os.Build;
import android.provider.Settings.Secure;
import android.view.View;
import android.view.inputmethod.InputMethodInfo;
import android.view.inputmethod.InputMethodManager;
import java.util.Collection;

public final class InputMethods {
  public static final String METHOD_ANDROID_LATINIME = "com.android.inputmethod.latin/.LatinIME";
  // ATOK has a lot of package names since they release custom versions.
  public static final String METHOD_ATOK_PREFIX = "com.justsystems.atokmobile";
  public static final String METHOD_ATOK_OEM_PREFIX = "com.atok.mobile.";
  public static final String METHOD_GOOGLE_JAPANESE_INPUT =
      "com.google.android.inputmethod.japanese/.MozcService";
  public static final String METHOD_ATOK_OEM_SOFTBANK =
      "com.mobiroo.n.justsystems.atok/.AtokInputMethodService";
  public static final String METHOD_GOOGLE_LATINIME =
      "com.google.android.inputmethod.latin/com.android.inputmethod.latin.LatinIME";
  public static final String METHOD_HTC_TOUCH_INPUT = "com.htc.android.htcime/.HTCIMEService";
  public static final String METHOD_IWNN =
      "jp.co.omronsoft.iwnnime.ml/.standardcommon.IWnnLanguageSwitcher";
  public static final String METHOD_OPENWNN_PLUS = "com.owplus.ime.openwnnplus/.OpenWnnJAJP";
  public static final String METHOD_SAMSUNG = "com.sec.android.inputmethod/.SamsungKeypad";
  public static final String METHOD_SIMEJI = "com.adamrocker.android.input.simeji/.OpenWnnSimeji";
  public static final String METHOD_SONY =
      "com.sonyericsson.textinput.uxp/.glue.InputMethodServiceGlue";
  public static final String METHOD_SWIFTKEY =
      "com.touchtype.swiftkey/com.touchtype.KeyboardService";
  public static final String METHOD_SWYPE = "com.swype.android.inputmethod/.SwypeInputMethod";
  public static final String METHOD_SWYPE_BETA = "com.nuance.swype.input/.IME";
  public static final String METHOD_TOUCHPAL_KEYBOARD =
      "com.cootek.smartinputv5/com.cootek.smartinput5.TouchPalIME";

  private InputMethods() {}

  public static String getCurrentInputMethod(final Context context) {
    final String inputMethod =
        Secure.getString(context.getContentResolver(), Secure.DEFAULT_INPUT_METHOD);
    return (inputMethod != null ? inputMethod : "");
  }

  public static InputMethodInfo getInputMethodInfo(
      final Context context, final String inputMethod) {
    final InputMethodManager imm = getInputMethodManager(context);
    final Collection<InputMethodInfo> infos = imm.getEnabledInputMethodList();
    for (final InputMethodInfo info : infos) {
      if (info.getId().equals(inputMethod)) {
        return info;
      }
    }
    return null;
  }

  public static InputMethodManager getInputMethodManager(final Context context) {
    return (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
  }

  public static void restartInput(final Context context, final View view) {
    final InputMethodManager imm = getInputMethodManager(context);
    if (imm != null) {
      imm.restartInput(view);
    }
  }

  public static boolean needsSoftResetWorkaround(final String inputMethod) {
    // Stock latin IME on Android 4.2 and above
    return Build.VERSION.SDK_INT >= 17
        && (METHOD_ANDROID_LATINIME.equals(inputMethod)
            || METHOD_GOOGLE_LATINIME.equals(inputMethod));
  }

  /**
   * Check input method if we require a workaround to remove composition in {@link
   * android.view.inputmethod.InputMethodManager.updateSelection}.
   *
   * @param inputMethod The input method name by {@link #getCurrentInputMethod}.
   * @return true if {@link android.view.inputmethod.InputMethodManager.updateSelection} doesn't
   *     remove the composition, use {@link
   *     android.view.inputmethod.InputMehtodManager.restartInput} to remove it in this case.
   */
  public static boolean needsRestartInput(final String inputMethod) {
    return inputMethod.startsWith(METHOD_ATOK_PREFIX)
        || inputMethod.startsWith(METHOD_ATOK_OEM_PREFIX)
        || METHOD_ATOK_OEM_SOFTBANK.equals(inputMethod);
  }

  public static boolean shouldCommitCharAsKey(final String inputMethod) {
    return METHOD_HTC_TOUCH_INPUT.equals(inputMethod);
  }

  public static boolean needsRestartOnReplaceRemove(final Context context) {
    final String inputMethod = getCurrentInputMethod(context);
    return METHOD_SONY.equals(inputMethod);
  }

  // TODO: Replace usages by definition in EditorInfoCompat once available (bug 1385726).
  public static final int IME_FLAG_NO_PERSONALIZED_LEARNING = 0x1000000;
}