/*
 * Copyright (C) 2009 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.contacts;

import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.database.Cursor;
import android.graphics.Rect;
import android.location.CountryDetector;
import android.net.Uri;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.Im;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.provider.ContactsContract.DisplayPhoto;
import android.provider.ContactsContract.QuickContact;
import android.telephony.PhoneNumberUtils;
import android.text.TextUtils;
import android.view.View;
import android.widget.TextView;

import com.android.contacts.activities.DialtactsActivity;
import com.android.contacts.model.AccountTypeManager;
import com.android.contacts.model.account.AccountType;
import com.android.contacts.model.account.AccountWithDataSet;
import com.android.contacts.test.NeededForTesting;
import com.android.contacts.util.Constants;

import java.util.List;

public class ContactsUtils {
    private static final String TAG = "ContactsUtils";
    private static final String WAIT_SYMBOL_AS_STRING = String.valueOf(PhoneNumberUtils.WAIT);

    private static int sThumbnailSize = -1;

    // TODO find a proper place for the canonical version of these
    public interface ProviderNames {
        String YAHOO = "Yahoo";
        String GTALK = "GTalk";
        String MSN = "MSN";
        String ICQ = "ICQ";
        String AIM = "AIM";
        String XMPP = "XMPP";
        String JABBER = "JABBER";
        String SKYPE = "SKYPE";
        String QQ = "QQ";
    }

    /**
     * This looks up the provider name defined in
     * ProviderNames from the predefined IM protocol id.
     * This is used for interacting with the IM application.
     *
     * @param protocol the protocol ID
     * @return the provider name the IM app uses for the given protocol, or null if no
     * provider is defined for the given protocol
     * @hide
     */
    public static String lookupProviderNameFromId(int protocol) {
        switch (protocol) {
            case Im.PROTOCOL_GOOGLE_TALK:
                return ProviderNames.GTALK;
            case Im.PROTOCOL_AIM:
                return ProviderNames.AIM;
            case Im.PROTOCOL_MSN:
                return ProviderNames.MSN;
            case Im.PROTOCOL_YAHOO:
                return ProviderNames.YAHOO;
            case Im.PROTOCOL_ICQ:
                return ProviderNames.ICQ;
            case Im.PROTOCOL_JABBER:
                return ProviderNames.JABBER;
            case Im.PROTOCOL_SKYPE:
                return ProviderNames.SKYPE;
            case Im.PROTOCOL_QQ:
                return ProviderNames.QQ;
        }
        return null;
    }

    /**
     * Test if the given {@link CharSequence} contains any graphic characters,
     * first checking {@link TextUtils#isEmpty(CharSequence)} to handle null.
     */
    public static boolean isGraphic(CharSequence str) {
        return !TextUtils.isEmpty(str) && TextUtils.isGraphic(str);
    }

    /**
     * Returns true if two objects are considered equal.  Two null references are equal here.
     */
    @NeededForTesting
    public static boolean areObjectsEqual(Object a, Object b) {
        return a == b || (a != null && a.equals(b));
    }

    /**
     * Returns true if two data with mimetypes which represent values in contact entries are
     * considered equal for collapsing in the GUI. For caller-id, use
     * {@link PhoneNumberUtils#compare(Context, String, String)} instead
     */
    public static final boolean shouldCollapse(CharSequence mimetype1, CharSequence data1,
            CharSequence mimetype2, CharSequence data2) {
        // different mimetypes? don't collapse
        if (!TextUtils.equals(mimetype1, mimetype2)) return false;

        // exact same string? good, bail out early
        if (TextUtils.equals(data1, data2)) return true;

        // so if either is null, these two must be different
        if (data1 == null || data2 == null) return false;

        // if this is not about phone numbers, we know this is not a match (of course, some
        // mimetypes could have more sophisticated matching is the future, e.g. addresses)
        if (!TextUtils.equals(Phone.CONTENT_ITEM_TYPE, mimetype1)) return false;

        return shouldCollapsePhoneNumbers(data1.toString(), data2.toString());
    }

    private static final boolean shouldCollapsePhoneNumbers(
            String number1WithLetters, String number2WithLetters) {
        final String number1 = PhoneNumberUtils.convertKeypadLettersToDigits(number1WithLetters);
        final String number2 = PhoneNumberUtils.convertKeypadLettersToDigits(number2WithLetters);

        int index1 = 0;
        int index2 = 0;
        for (;;) {
            // Skip formatting characters.
            while (index1 < number1.length() &&
                    !PhoneNumberUtils.isNonSeparator(number1.charAt(index1))) {
                index1++;
            }
            while (index2 < number2.length() &&
                    !PhoneNumberUtils.isNonSeparator(number2.charAt(index2))) {
                index2++;
            }
            // If both have finished, match.  If only one has finished, not match.
            final boolean number1End = (index1 == number1.length());
            final boolean number2End = (index2 == number2.length());
            if (number1End) {
                return number2End;
            }
            if (number2End) return false;

            // If the non-formatting characters are different, not match.
            if (number1.charAt(index1) != number2.charAt(index2)) return false;

            // Go to the next characters.
            index1++;
            index2++;
        }
    }

    /**
     * Returns true if two {@link Intent}s are both null, or have the same action.
     */
    public static final boolean areIntentActionEqual(Intent a, Intent b) {
        if (a == b) {
            return true;
        }
        if (a == null || b == null) {
            return false;
        }
        return TextUtils.equals(a.getAction(), b.getAction());
    }

    /**
     * @return The ISO 3166-1 two letters country code of the country the user
     *         is in.
     */
    public static final String getCurrentCountryIso(Context context) {
        CountryDetector detector =
                (CountryDetector) context.getSystemService(Context.COUNTRY_DETECTOR);
        return detector.detectCountry().getCountryIso();
    }

    public static boolean areContactWritableAccountsAvailable(Context context) {
        final List<AccountWithDataSet> accounts =
                AccountTypeManager.getInstance(context).getAccounts(true /* writeable */);
        return !accounts.isEmpty();
    }

    public static boolean areGroupWritableAccountsAvailable(Context context) {
        final List<AccountWithDataSet> accounts =
                AccountTypeManager.getInstance(context).getGroupWritableAccounts();
        return !accounts.isEmpty();
    }

    /**
     * Returns the intent to launch for the given invitable account type and contact lookup URI.
     * This will return null if the account type is not invitable (i.e. there is no
     * {@link AccountType#getInviteContactActivityClassName()} or
     * {@link AccountType#syncAdapterPackageName}).
     */
    public static Intent getInvitableIntent(AccountType accountType, Uri lookupUri) {
        String syncAdapterPackageName = accountType.syncAdapterPackageName;
        String className = accountType.getInviteContactActivityClassName();
        if (TextUtils.isEmpty(syncAdapterPackageName) || TextUtils.isEmpty(className)) {
            return null;
        }
        Intent intent = new Intent();
        intent.setClassName(syncAdapterPackageName, className);

        intent.setAction(ContactsContract.Intents.INVITE_CONTACT);

        // Data is the lookup URI.
        intent.setData(lookupUri);
        return intent;
    }

    /**
     * Return Uri with an appropriate scheme, accepting Voicemail, SIP, and usual phone call
     * numbers.
     */
    public static Uri getCallUri(String number) {
        if (PhoneNumberUtils.isUriNumber(number)) {
             return Uri.fromParts(Constants.SCHEME_SIP, number, null);
        }
        return Uri.fromParts(Constants.SCHEME_TEL, number, null);
     }

    /**
     * Return an Intent for making a phone call. Scheme (e.g. tel, sip) will be determined
     * automatically.
     */
    public static Intent getCallIntent(String number) {
        return getCallIntent(number, null);
    }

    /**
     * Return an Intent for making a phone call. A given Uri will be used as is (without any
     * sanity check).
     */
    public static Intent getCallIntent(Uri uri) {
        return getCallIntent(uri, null);
    }

    /**
     * A variant of {@link #getCallIntent(String)} but also accept a call origin. For more
     * information about call origin, see comments in Phone package (PhoneApp).
     */
    public static Intent getCallIntent(String number, String callOrigin) {
        return getCallIntent(getCallUri(number), callOrigin);
    }

    /**
     * A variant of {@link #getCallIntent(Uri)} but also accept a call origin. For more
     * information about call origin, see comments in Phone package (PhoneApp).
     */
    public static Intent getCallIntent(Uri uri, String callOrigin) {
        final Intent intent = new Intent(Intent.ACTION_CALL_PRIVILEGED, uri);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        if (callOrigin != null) {
            intent.putExtra(DialtactsActivity.EXTRA_CALL_ORIGIN, callOrigin);
        }
        return intent;
    }

    /**
     * Return an Intent for launching voicemail screen.
     */
    public static Intent getVoicemailIntent() {
        final Intent intent = new Intent(Intent.ACTION_CALL_PRIVILEGED,
                Uri.fromParts("voicemail", "", null));
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        return intent;
    }

    /**
     * Returns a header view based on the R.layout.list_separator, where the
     * containing {@link TextView} is set using the given textResourceId.
     */
    public static View createHeaderView(Context context, int textResourceId) {
        View view = View.inflate(context, R.layout.list_separator, null);
        TextView textView = (TextView) view.findViewById(R.id.title);
        textView.setText(context.getString(textResourceId));
        return view;
    }

    /**
     * Returns the {@link Rect} with left, top, right, and bottom coordinates
     * that are equivalent to the given {@link View}'s bounds. This is equivalent to how the
     * target {@link Rect} is calculated in {@link QuickContact#showQuickContact}.
     */
    public static Rect getTargetRectFromView(Context context, View view) {
        final float appScale = context.getResources().getCompatibilityInfo().applicationScale;
        final int[] pos = new int[2];
        view.getLocationOnScreen(pos);

        final Rect rect = new Rect();
        rect.left = (int) (pos[0] * appScale + 0.5f);
        rect.top = (int) (pos[1] * appScale + 0.5f);
        rect.right = (int) ((pos[0] + view.getWidth()) * appScale + 0.5f);
        rect.bottom = (int) ((pos[1] + view.getHeight()) * appScale + 0.5f);
        return rect;
    }

    /**
     * Returns the size (width and height) of thumbnail pictures as configured in the provider. This
     * can safely be called from the UI thread, as the provider can serve this without performing
     * a database access
     */
    public static int getThumbnailSize(Context context) {
        if (sThumbnailSize == -1) {
            final Cursor c = context.getContentResolver().query(
                    DisplayPhoto.CONTENT_MAX_DIMENSIONS_URI,
                    new String[] { DisplayPhoto.THUMBNAIL_MAX_DIM }, null, null, null);
            try {
                c.moveToFirst();
                sThumbnailSize = c.getInt(0);
            } finally {
                c.close();
            }
        }
        return sThumbnailSize;
    }

    /**
     * @return if the context is in landscape orientation.
     */
    public static boolean isLandscape(Context context) {
        return context.getResources().getConfiguration().orientation
                == Configuration.ORIENTATION_LANDSCAPE;
    }
}