/*
 * Copyright (C) 2011 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.googlecode.eyesfree.espeak;

import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.PreferenceActivity;
import android.preference.PreferenceGroup;

public class TtsSettingsActivity extends PreferenceActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        addPreferencesFromResource(R.xml.preferences);

        fixListSummaries(getPreferenceScreen());
    }

    /**
     * Since the "%s" summary is currently broken, this sets the preference
     * change listener for all {@link ListPreference} views to fill in the
     * summary with the current entry value.
     */
    private void fixListSummaries(PreferenceGroup group) {
        if (group == null) {
            return;
        }

        final int count = group.getPreferenceCount();

        for (int i = 0; i < count; i++) {
            final Preference preference = group.getPreference(i);

            if (preference instanceof PreferenceGroup) {
                fixListSummaries((PreferenceGroup) preference);
            } else if (preference instanceof ListPreference) {
                preference.setOnPreferenceChangeListener(mPreferenceChangeListener);
            }
        }
    }

    /**
     * Listens for preference changes and updates the summary to reflect the
     * current setting. This shouldn't be necessary, since preferences are
     * supposed to automatically do this when the summary is set to "%s".
     */
    private final OnPreferenceChangeListener mPreferenceChangeListener =
            new OnPreferenceChangeListener() {
                @Override
                public boolean onPreferenceChange(Preference preference, Object newValue) {
                    if (preference instanceof ListPreference && newValue instanceof String) {
                        final ListPreference listPreference = (ListPreference) preference;
                        final int index = listPreference.findIndexOfValue((String) newValue);
                        final CharSequence[] entries = listPreference.getEntries();

                        if (index >= 0 && index < entries.length) {
                            preference.setSummary(entries[index].toString().replaceAll("%", "%%"));
                        } else {
                            preference.setSummary("");
                        }
                    }

                    return true;
                }
            };
}