/*
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
 *
 * 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 net.micode.notes.ui;

import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.ActionBar;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceClickListener;
import android.preference.PreferenceActivity;
import android.preference.PreferenceCategory;
import android.text.TextUtils;
import android.text.format.DateFormat;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import net.micode.notes.R;
import net.micode.notes.data.Notes;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.gtask.remote.GTaskSyncService;

//NotesPreferenceActivity其中包含应用程序的偏好设置
//用户可以通过这个列表来更改应用程序的设置
//主要实现的是对背景颜色和字体大小的数据储存
//继承自 PreferenceActivity 类
public class NotesPreferenceActivity extends PreferenceActivity {
    public static final String PREFERENCE_NAME = "notes_preferences";  //首选便签

    public static final String PREFERENCE_SYNC_ACCOUNT_NAME = "pref_key_account_name"; //同步账号

    public static final String PREFERENCE_LAST_SYNC_TIME = "pref_last_sync_time"; //同步时间

    public static final String PREFERENCE_SET_BG_COLOR_KEY = "pref_key_bg_random_appear";

    private static final String PREFERENCE_SYNC_ACCOUNT_KEY = "pref_sync_account_key";//同步密码

    private static final String AUTHORITIES_FILTER_KEY = "authorities";//本地密码

    private PreferenceCategory mAccountCategory; //账户类别

    private GTaskReceiver mReceiver; //任务接收器

    private Account[] mOriAccounts;//账户

    private boolean mHasAddedAccount; //账户hash标记

    @Override
    //创建
    protected void onCreate(Bundle icicle) {
        //调用父类的 onCreate 方法并传入保存的实例状态
        super.onCreate(icicle);

        /* using the app icon for navigation */
        //使用应用程序图标进行导航
        //设置返回图标
        getActionBar().setDisplayHomeAsUpEnabled(true);

        //从资源添加首选项
        //添加xml来源并显示 xml
        addPreferencesFromResource(R.xml.preferences);
         //根据同步账户关键码来初始化分组
        mAccountCategory = (PreferenceCategory) findPreference(PREFERENCE_SYNC_ACCOUNT_KEY);
        mReceiver = new GTaskReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction(GTaskSyncService.GTASK_SERVICE_BROADCAST_NAME);
        registerReceiver(mReceiver, filter);

        mOriAccounts = null;
        //获取listvivew并在listview组件上方添加其他组件
        View header = LayoutInflater.from(this).inflate(R.layout.settings_header, null);
        getListView().addHeaderView(header, null, true);
    }

    @Override
    //
    protected void onResume() {
        //执行父类
        super.onResume();

        // need to set sync account automatically if user has added a new
        //如果用户添加了新的同步帐户，则需要自动设置同步帐户
        // account
        //如果为真
        if (mHasAddedAccount) {
            //获取谷歌账户
            Account[] accounts = getGoogleAccounts();
            //若原账户不为空且账户数量有增加
            if (mOriAccounts != null && accounts.length > mOriAccounts.length) {
                //遍历 accounts 中的每个帐户
                for (Account accountNew : accounts) {
                    //如果没有找到相同名称的账户，就调用setSyncAccount 方法并传入新帐户的名称
                    boolean found = false;
                    for (Account accountOld : mOriAccounts) {
                        if (TextUtils.equals(accountOld.name, accountNew.name)) {
                            found = true;
                            break;
                        }
                    }
                    if (!found) {
                        setSyncAccount(accountNew.name);
                        break;
                    }
                }
            }
        }
        //刷新UI
        refreshUI();
    }

    @Override
    //摧毁
    protected void onDestroy() {
        if (mReceiver != null) {
            unregisterReceiver(mReceiver); //注销接收器
        }
        //调用父类
        super.onDestroy();
    }

    //加载帐户首选项
    private void loadAccountPreference() {
        //删除所有首选项
        mAccountCategory.removeAll();

        Preference accountPref = new Preference(this);
        //获取默认账户名称
        final String defaultAccount = getSyncAccountName(this);
        //设置帐户首选项的标题和摘要文本
        accountPref.setTitle(getString(R.string.preferences_account_title));
        accountPref.setSummary(getString(R.string.preferences_account_summary));
        accountPref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
            //为帐户首选项设置一个点击监听器
            public boolean onPreferenceClick(Preference preference) {
                if (!GTaskSyncService.isSyncing()) {
                    if (TextUtils.isEmpty(defaultAccount)) {
                        // the first time to set account
                        //显示选择帐户的警告对话框
                        showSelectAccountAlertDialog();
                    } else {
                        // if the account has already been set, we need to promp
                        //如果帐户已经设置，我们需要 promp
                        // user about the risk
                        //展示更改警示对话框
                        showChangeAccountConfirmAlertDialog();
                    }
                } else {
                    Toast.makeText(NotesPreferenceActivity.this,
                            R.string.preferences_toast_cannot_change_account, Toast.LENGTH_SHORT)
                            .show();
                }
                return true;
            }
        });
        //最后，将帐户首选项添加到成员变量 mAccountCategory 中
        mAccountCategory.addPreference(accountPref);
    }

    //设置按键的状态和最后同步的时间
    private void loadSyncButton() {
        //查找同步按钮和最后同步时间视图
        Button syncButton = (Button) findViewById(R.id.preference_sync_button);
        TextView lastSyncTimeView = (TextView) findViewById(R.id.prefenerece_sync_status_textview);

        // set button stat //设置按钮状态
        //若在同步状态
        if (GTaskSyncService.isSyncing()) {
            //设置同步按钮的文本为取消同步
            syncButton.setText(getString(R.string.preferences_button_sync_cancel));
            //并为按钮设置一个点击监听器
            syncButton.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    GTaskSyncService.cancelSync(NotesPreferenceActivity.this);
                }
            });
        } else {
            //否则设置同步按钮的文本为立即同步
            //并为按钮设置一个点击监听器，当用户点击按钮时，监听器会调用 GTaskSyncService.startSync 方法并传入当前活动来开始同步
            syncButton.setText(getString(R.string.preferences_button_sync_immediately));
            syncButton.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    GTaskSyncService.startSync(NotesPreferenceActivity.this);
                }
            });
        }
        syncButton.setEnabled(!TextUtils.isEmpty(getSyncAccountName(this)));

        // set last sync time
        //设置最终同步时间
        if (GTaskSyncService.isSyncing()) {
            lastSyncTimeView.setText(GTaskSyncService.getProgressString());
            lastSyncTimeView.setVisibility(View.VISIBLE);
        } else {
            //若非同步
            long lastSyncTime = getLastSyncTime(this);
            if (lastSyncTime != 0) {
                //若不为0则设置最后同步时间视图的文本并将其设置为可见
                lastSyncTimeView.setText(getString(R.string.preferences_last_sync_time,
                        DateFormat.format(getString(R.string.preferences_last_sync_time_format),
                                lastSyncTime)));
                lastSyncTimeView.setVisibility(View.VISIBLE);
            } else {
                //否则，将其设置为隐藏
                lastSyncTimeView.setVisibility(View.GONE);
            }
        }
    }

    //更新界面
    private void refreshUI() {
        loadAccountPreference();
        loadSyncButton();
    }

    //显示账户选择的对话框并进行账户的设置
    private void showSelectAccountAlertDialog() {
        //创建一个对话框
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);

        View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null);
        TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title);
        titleTextView.setText(getString(R.string.preferences_dialog_select_account_title));
        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle);
         //设置标题以及子标题的内容
        subtitleTextView.setText(getString(R.string.preferences_dialog_select_account_tips));

        dialogBuilder.setCustomTitle(titleView);
        dialogBuilder.setPositiveButton(null, null);

        //获取账户
        //获取账户名称
        Account[] accounts = getGoogleAccounts();
        String defAccount = getSyncAccountName(this);

        mOriAccounts = accounts;
        mHasAddedAccount = false;

        //如果账户数量不是0
        if (accounts.length > 0) {
            CharSequence[] items = new CharSequence[accounts.length];
            final CharSequence[] itemMapping = items;
            int checkedItem = -1;
            int index = 0;
            for (Account account : accounts) {
                if (TextUtils.equals(account.name, defAccount)) {
                    //在账户列表中查询到所需账户
                    checkedItem = index;
                }
                items[index++] = account.name;
            }
            //设置一个单选框
            dialogBuilder.setSingleChoiceItems(items, checkedItem,
                    //新建一个列表监听器
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            setSyncAccount(itemMapping[which].toString());
                            dialog.dismiss();//取消对话框
                            refreshUI();//更新界面
                        }
                    });
        }
        //给新加账户对话框设置自定义样式
        View addAccountView = LayoutInflater.from(this).inflate(R.layout.add_account_text, null);
        dialogBuilder.setView(addAccountView);
        
        //显示对话框
        final AlertDialog dialog = dialogBuilder.show();
        //添加账户账户对话框监听器
        addAccountView.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                //账户哈希表置为true
                mHasAddedAccount = true;
                //建立网络建立组件
                Intent intent = new Intent("android.settings.ADD_ACCOUNT_SETTINGS");
                intent.putExtra(AUTHORITIES_FILTER_KEY, new String[] {
                    "gmail-ls"
                });
                //跳回上一个选项
                startActivityForResult(intent, -1);
                dialog.dismiss();
            }
        });
    }

    //显示账户选择对话框和相关账户操作
    private void showChangeAccountConfirmAlertDialog() {
        //创建对话框
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);

        View titleView = LayoutInflater.from(this).inflate(R.layout.account_dialog_title, null);
        TextView titleTextView = (TextView) titleView.findViewById(R.id.account_dialog_title);
        titleTextView.setText(getString(R.string.preferences_dialog_change_account_title,
                getSyncAccountName(this)));
        TextView subtitleTextView = (TextView) titleView.findViewById(R.id.account_dialog_subtitle);
        //根据同步修改的账户信息设置标题以及子标题的内容
        subtitleTextView.setText(getString(R.string.preferences_dialog_change_account_warn_msg));        
        //设置对话框的自定义标题
        dialogBuilder.setCustomTitle(titleView);

        //定义字符串
        CharSequence[] menuItemArray = new CharSequence[] {
                getString(R.string.preferences_menu_change_account),
                getString(R.string.preferences_menu_remove_account),
                getString(R.string.preferences_menu_cancel)
        };
        dialogBuilder.setItems(menuItemArray, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                if (which == 0) {
                    showSelectAccountAlertDialog();
                } else if (which == 1) { //如果witch==1 //删除账户并且跟新便签界面
                    removeSyncAccount();
                    refreshUI();
                }
            }
        });
        //显示对话框
        dialogBuilder.show();
    }

    //获取谷歌账户
    private Account[] getGoogleAccounts() {
        AccountManager accountManager = AccountManager.get(this);
        return accountManager.getAccountsByType("com.google");
    }

    //设置同步账户
    private void setSyncAccount(String account) {
        	//假如该账号不在同步账号列表中
        if (!getSyncAccountName(this).equals(account)) {
            SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
            SharedPreferences.Editor editor = settings.edit();
            if (account != null) {
                editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, account);
            } else {
                editor.putString(PREFERENCE_SYNC_ACCOUNT_NAME, "");
            }
            //提交修改的数据
            editor.commit();

            // clean up last sync time
            //清理上次同步时间
            setLastSyncTime(this, 0);

            // clean up local gtask related info
            // 清理本地 gtask 相关信息
            new Thread(new Runnable() {
                public void run() {
                    ContentValues values = new ContentValues();
                    values.put(NoteColumns.GTASK_ID, "");
                    values.put(NoteColumns.SYNC_ID, 0);
                    getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
                }
            }).start();

            //将toast的文本信息置为“设置账户成功”并显示出来
            Toast.makeText(NotesPreferenceActivity.this,
                    getString(R.string.preferences_toast_success_set_accout, account),
                    Toast.LENGTH_SHORT).show();
        }
    }


    //删除同步账户
    private void removeSyncAccount() {
        //设置共享首选项
        SharedPreferences settings = getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = settings.edit();
        if (settings.contains(PREFERENCE_SYNC_ACCOUNT_NAME)) {//假如当前首选项中有账户就删除
            editor.remove(PREFERENCE_SYNC_ACCOUNT_NAME);
        }
        //删除当前首选项中有账户时间
        if (settings.contains(PREFERENCE_LAST_SYNC_TIME)) {
            editor.remove(PREFERENCE_LAST_SYNC_TIME);
        }
        //提交
        editor.commit();

        // clean up local gtask related info
        //清理本地 gtask 相关信息
        new Thread(new Runnable() {
            public void run() {
                ContentValues values = new ContentValues();
                values.put(NoteColumns.GTASK_ID, "");
                values.put(NoteColumns.SYNC_ID, 0);
                getContentResolver().update(Notes.CONTENT_NOTE_URI, values, null, null);
            }
        }).start();
    }

    //获取同步账户名称
    public static String getSyncAccountName(Context context) {
        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
                Context.MODE_PRIVATE);
        return settings.getString(PREFERENCE_SYNC_ACCOUNT_NAME, "");
    }

    //设置最终同步的时间
    public static void setLastSyncTime(Context context, long time) {
        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
                Context.MODE_PRIVATE);
        // 从共享首选项中找到相关账户并获取其编辑器
        SharedPreferences.Editor editor = settings.edit();
        editor.putLong(PREFERENCE_LAST_SYNC_TIME, time);
        editor.commit();
    }

    //获取最终同步时间
    public static long getLastSyncTime(Context context) {
        SharedPreferences settings = context.getSharedPreferences(PREFERENCE_NAME,
                Context.MODE_PRIVATE);
        return settings.getLong(PREFERENCE_LAST_SYNC_TIME, 0);
    }

    //接受同步信息
    private class GTaskReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            refreshUI();
            //获取随广播而来的Intent中的同步服务的数据
            //通过获取的数据在设置系统的状态
            if (intent.getBooleanExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_IS_SYNCING, false)) {
                TextView syncStatus = (TextView) findViewById(R.id.prefenerece_sync_status_textview);
                syncStatus.setText(intent
                        .getStringExtra(GTaskSyncService.GTASK_SERVICE_BROADCAST_PROGRESS_MSG));
            }

        }
    }
    //处理菜单的选项
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                Intent intent = new Intent(this, NotesListActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(intent);
                return true;
            default:
                return false;
        }
    }
}
