/*
 * 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 android.accounts;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import com.android.internal.R;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 * @hide
 */
public class ChooseAccountTypeActivity extends Activity {
    private static final String TAG = "AccountChooser";

    private HashMap<String, AuthInfo> mTypeToAuthenticatorInfo = new HashMap<String, AuthInfo>();
    private ArrayList<AuthInfo> mAuthenticatorInfosToDisplay;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (Log.isLoggable(TAG, Log.VERBOSE)) {
            Log.v(TAG, "ChooseAccountTypeActivity.onCreate(savedInstanceState="
                    + savedInstanceState + ")");
        }

        // Read the validAccountTypes, if present, and add them to the setOfAllowableAccountTypes
        Set<String> setOfAllowableAccountTypes = null;
        String[] validAccountTypes = getIntent().getStringArrayExtra(
                ChooseTypeAndAccountActivity.EXTRA_ALLOWABLE_ACCOUNT_TYPES_STRING_ARRAY);
        if (validAccountTypes != null) {
            setOfAllowableAccountTypes = new HashSet<String>(validAccountTypes.length);
            for (String type : validAccountTypes) {
                setOfAllowableAccountTypes.add(type);
            }
        }

        // create a map of account authenticators
        buildTypeToAuthDescriptionMap();

        // Create a list of authenticators that are allowable. Filter out those that
        // don't match the allowable account types, if provided.
        mAuthenticatorInfosToDisplay = new ArrayList<AuthInfo>(mTypeToAuthenticatorInfo.size());
        for (Map.Entry<String, AuthInfo> entry: mTypeToAuthenticatorInfo.entrySet()) {
            final String type = entry.getKey();
            final AuthInfo info = entry.getValue();
            if (setOfAllowableAccountTypes != null
                    && !setOfAllowableAccountTypes.contains(type)) {
                continue;
            }
            mAuthenticatorInfosToDisplay.add(info);
        }

        if (mAuthenticatorInfosToDisplay.isEmpty()) {
            Bundle bundle = new Bundle();
            bundle.putString(AccountManager.KEY_ERROR_MESSAGE, "no allowable account types");
            setResult(Activity.RESULT_OK, new Intent().putExtras(bundle));
            finish();
            return;
        }

        if (mAuthenticatorInfosToDisplay.size() == 1) {
            setResultAndFinish(mAuthenticatorInfosToDisplay.get(0).desc.type);
            return;
        }

        setContentView(R.layout.choose_account_type);
        // Setup the list
        ListView list = findViewById(android.R.id.list);
        // Use an existing ListAdapter that will map an array of strings to TextViews
        list.setAdapter(new AccountArrayAdapter(this,
                android.R.layout.simple_list_item_1, mAuthenticatorInfosToDisplay));
        list.setChoiceMode(ListView.CHOICE_MODE_NONE);
        list.setTextFilterEnabled(false);
        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                setResultAndFinish(mAuthenticatorInfosToDisplay.get(position).desc.type);
            }
        });
    }

    private void setResultAndFinish(final String type) {
        Bundle bundle = new Bundle();
        bundle.putString(AccountManager.KEY_ACCOUNT_TYPE, type);
        setResult(Activity.RESULT_OK, new Intent().putExtras(bundle));
        if (Log.isLoggable(TAG, Log.VERBOSE)) {
            Log.v(TAG, "ChooseAccountTypeActivity.setResultAndFinish: "
                    + "selected account type " + type);
        }
        finish();
    }

    private void buildTypeToAuthDescriptionMap() {
        for(AuthenticatorDescription desc : AccountManager.get(this).getAuthenticatorTypes()) {
            String name = null;
            Drawable icon = null;
            try {
                Context authContext = createPackageContext(desc.packageName, 0);
                icon = authContext.getDrawable(desc.iconId);
                final CharSequence sequence = authContext.getResources().getText(desc.labelId);
                if (sequence != null) {
                    name = sequence.toString();
                }
                name = sequence.toString();
            } catch (PackageManager.NameNotFoundException e) {
                // Nothing we can do much here, just log
                if (Log.isLoggable(TAG, Log.WARN)) {
                    Log.w(TAG, "No icon name for account type " + desc.type);
                }
            } catch (Resources.NotFoundException e) {
                // Nothing we can do much here, just log
                if (Log.isLoggable(TAG, Log.WARN)) {
                    Log.w(TAG, "No icon resource for account type " + desc.type);
                }
            }
            AuthInfo authInfo = new AuthInfo(desc, name, icon);
            mTypeToAuthenticatorInfo.put(desc.type, authInfo);
        }
    }

    private static class AuthInfo {
        final AuthenticatorDescription desc;
        final String name;
        final Drawable drawable;

        AuthInfo(AuthenticatorDescription desc, String name, Drawable drawable) {
            this.desc = desc;
            this.name = name;
            this.drawable = drawable;
        }
    }

    private static class ViewHolder {
        ImageView icon;
        TextView text;
    }

    private static class AccountArrayAdapter extends ArrayAdapter<AuthInfo> {
        private LayoutInflater mLayoutInflater;
        private ArrayList<AuthInfo> mInfos;

        public AccountArrayAdapter(Context context, int textViewResourceId,
                ArrayList<AuthInfo> infos) {
            super(context, textViewResourceId, infos);
            mInfos = infos;
            mLayoutInflater = (LayoutInflater) context.getSystemService(
                    Context.LAYOUT_INFLATER_SERVICE);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder;

            if (convertView == null) {
                convertView = mLayoutInflater.inflate(R.layout.choose_account_row, null);
                holder = new ViewHolder();
                holder.text = (TextView) convertView.findViewById(R.id.account_row_text);
                holder.icon = (ImageView) convertView.findViewById(R.id.account_row_icon);
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }

            holder.text.setText(mInfos.get(position).name);
            holder.icon.setImageDrawable(mInfos.get(position).drawable);

            return convertView;
        }
    }
}