/*
 * 				Firetweet - Twitter client for Android
 * 
 *  Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com>
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.getlantern.firetweet.provider;

import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.Context;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.net.Uri;

import org.getlantern.firetweet.Constants;
import org.getlantern.firetweet.app.FiretweetApplication;
import org.getlantern.firetweet.provider.FiretweetCommands.Refresh;
import org.getlantern.firetweet.util.AsyncTwitterWrapper;
import org.getlantern.firetweet.util.PermissionsManager;

public class FiretweetCommandProvider extends ContentProvider implements Constants {

	private static final UriMatcher COMMAND_URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH);

	private static final int CODE_REFRESH_ALL = 10;
	private static final int CODE_REFRESH_HOME_TIMELINE = 11;
	private static final int CODE_REFRESH_MENTIONS = 12;
	private static final int CODE_REFRESH_INBOX = 13;
	private static final int CODE_REFRESH_OUTBOX = 14;

	static {
		COMMAND_URI_MATCHER.addURI(FiretweetCommands.AUTHORITY, Refresh.ACTION_REFRESH_ALL, CODE_REFRESH_ALL);
	}

	private Context mContext;
	private PermissionsManager mPermissionsManager;
	private AsyncTwitterWrapper mTwitterWrapper;

	@Override
	public int delete(final Uri uri, final String where, final String[] whereArgs) {
		return 0;
	}

	@Override
	public String getType(final Uri uri) {
		return null;
	}

	@Override
	public Uri insert(final Uri uri, final ContentValues values) {
		if (handleInsertCommand(uri, values)) return uri;
		return null;
	}

	@Override
	public boolean onCreate() {
		mContext = getContext();
		final FiretweetApplication app = FiretweetApplication.getInstance(mContext);
		mPermissionsManager = new PermissionsManager(mContext);
		mTwitterWrapper = app.getTwitterWrapper();
		return true;
	}

	@Override
	public Cursor query(final Uri uri, final String[] projection, final String where, final String[] whereArgs,
			final String sortOrder) {
		return handleQueryCommand(uri);
	}

	@Override
	public int update(final Uri uri, final ContentValues values, final String where, final String[] whereArgs) {
		return 0;
	}

	private void checkInsertPermission(final int uri_code) {
		switch (uri_code) {
			case CODE_REFRESH_ALL:
			case CODE_REFRESH_HOME_TIMELINE:
			case CODE_REFRESH_MENTIONS:
			case CODE_REFRESH_INBOX:
			case CODE_REFRESH_OUTBOX: {
				if (!mPermissionsManager.checkCallingPermission(PERMISSION_REFRESH))
					throw new SecurityException("Executing this command requires level PERMISSION_REFRESH");
			}
		}
	}

	private void checkQueryPermission(final int uri_code) {
		switch (uri_code) {
			case CODE_REFRESH_ALL:
			case CODE_REFRESH_HOME_TIMELINE:
			case CODE_REFRESH_MENTIONS:
			case CODE_REFRESH_INBOX:
			case CODE_REFRESH_OUTBOX: {
				if (!mPermissionsManager.checkCallingPermission(PERMISSION_REFRESH))
					throw new SecurityException("Executing this command requires level PERMISSION_REFRESH");
			}
		}
	}

	private Cursor getEmptyCursor() {
		return new MatrixCursor(new String[0]);
	}

	private boolean handleInsertCommand(final Uri uri, final ContentValues values) {
		final int uri_code = COMMAND_URI_MATCHER.match(uri);
		checkInsertPermission(uri_code);
		try {
			switch (uri_code) {
				case CODE_REFRESH_ALL: {
					mTwitterWrapper.refreshAll();
					break;
				}
				default:
					return false;
			}
			// something blah blah blah
		} catch (final RuntimeException e) {
			e.printStackTrace();
			if (Thread.currentThread().getId() != 1)
				throw new IllegalStateException("This method cannot be called from non-UI thread");
		}
		return true;
	}

	private Cursor handleQueryCommand(final Uri uri) {
		final int uri_code = COMMAND_URI_MATCHER.match(uri);
		checkQueryPermission(uri_code);
		try {
			switch (uri_code) {
				case CODE_REFRESH_HOME_TIMELINE:
					if (mTwitterWrapper.isHomeTimelineRefreshing()) return getEmptyCursor();
				case CODE_REFRESH_MENTIONS:
					if (mTwitterWrapper.isMentionsTimelineRefreshing()) return getEmptyCursor();
				case CODE_REFRESH_INBOX:
					if (mTwitterWrapper.isReceivedDirectMessagesRefreshing()) return getEmptyCursor();
				case CODE_REFRESH_OUTBOX:
					if (mTwitterWrapper.isSentDirectMessagesRefreshing()) return getEmptyCursor();
				default:
					return null;
			}
			// something blah blah blah
		} catch (final RuntimeException e) {
			e.printStackTrace();
			if (Thread.currentThread().getId() != 1)
				throw new IllegalStateException("This method cannot be called from non-UI thread");
		}
		return null;
	}

}