/* ownCloud Android client application
 *   Copyright (C) 2012  Bartek Przybylski
 *
 *   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 eu.alefzero.owncloud.datamodel;

import java.io.File;
import java.util.Vector;

import android.accounts.Account;
import android.content.ContentProviderClient;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.RemoteException;
import android.util.Log;
import eu.alefzero.owncloud.db.ProviderMeta.ProviderTableMeta;

public class OCFile {
	private static String TAG = "OCFile";

	private long id_;
	private long parent_id_;
	private long length_;
	private long creation_timestamp_;
	private long modified_timestamp_;
	private String path_;
	private String storage_path_;
	private String mimetype_;

	private ContentResolver contentResolver_;
	private ContentProviderClient providerClient_;
	private Account account_;
	
	private OCFile(ContentProviderClient providerClient, Account account) {
		account_ = account;
		providerClient_ = providerClient;
		resetData();
	}

	private OCFile(ContentResolver contentResolver, Account account) {
		account_ = account;
		contentResolver_ = contentResolver;
		resetData();
	}
	
	/**
	 * Query the database for a {@link OCFile} belonging to a given account 
	 * and id.
	 * 
	 * @param resolver The {@link ContentResolver} to use
	 * @param account The {@link Account} the {@link OCFile} belongs to
	 * @param id The ID the file has in the database
	 */
	public OCFile(ContentResolver resolver, Account account, long id) {
		contentResolver_ = resolver;
		account_ = account;
		Cursor c = contentResolver_.query(ProviderTableMeta.CONTENT_URI_FILE,
				null, ProviderTableMeta.FILE_ACCOUNT_OWNER + "=? AND "
						+ ProviderTableMeta._ID + "=?", new String[] {
						account_.name, String.valueOf(id) }, null);
		if (c.moveToFirst())
			setFileData(c);
	}

	/**
	 * Query the database for a {@link OCFile} belonging to a given account
	 * and that matches remote path
	 * 
	 * @param contentResolver The {@link ContentResolver} to use
	 * @param account The {@link Account} the {@link OCFile} belongs to
	 * @param path The remote path of the file
	 */
	public OCFile(ContentResolver contentResolver, Account account, String path) {
		contentResolver_ = contentResolver;
		account_ = account;

		Cursor c = contentResolver_.query(ProviderTableMeta.CONTENT_URI_FILE,
				null, ProviderTableMeta.FILE_ACCOUNT_OWNER + "=? AND "
						+ ProviderTableMeta.FILE_PATH + "=?", new String[] {
						account_.name, path }, null);
		if (c.moveToFirst()) {
			setFileData(c);
			if (path_ != null)
				path_ = path;
		}
	}
	
	public OCFile(ContentProviderClient cp, Account account, String path) {
		providerClient_ = cp;
		account_ = account;

		try {
			Cursor c = providerClient_.query(ProviderTableMeta.CONTENT_URI_FILE, null,
					ProviderTableMeta.FILE_ACCOUNT_OWNER + "=? AND "
							+ ProviderTableMeta.FILE_PATH + "=?", new String[] {
							account_.name, path }, null);
			if (c.moveToFirst()) {
				setFileData(c);
				if (path_ != null)
					path_ = path;
			}
		} catch (RemoteException e) {
			Log.d(TAG, e.getMessage());
		}
	}

	/**
	 * Creates a new {@link OCFile}
	 *  
	 * @param providerClient The {@link ContentProviderClient} to use
	 * @param account The {@link Account} that this file belongs to
	 * @param path The remote path
	 * @param length The file size in bytes 
	 * @param creation_timestamp The UNIX timestamp of the creation date
	 * @param modified_timestamp The UNIX timestamp of the modification date
	 * @param mimetype The mimetype to set
	 * @param parent_id The parent folder of that file
	 * @return A new instance of {@link OCFile}
	 */
	public static OCFile createNewFile(ContentProviderClient providerClient,
			Account account, String path, long length, long creation_timestamp,
			long modified_timestamp, String mimetype, long parent_id) {
		OCFile new_file = new OCFile(providerClient, account);

		try {
			Cursor c = new_file.providerClient_.query(ProviderTableMeta.CONTENT_URI_FILE,
					null, ProviderTableMeta.FILE_ACCOUNT_OWNER + "=? AND "
							+ ProviderTableMeta.FILE_PATH + "=?", new String[] {
							new_file.account_.name, path }, null);
			if (c.moveToFirst())
				new_file.setFileData(c);
			c.close();
		} catch (RemoteException e) {
			Log.e(TAG, e.getMessage());
		}

		new_file.path_ = path;
		new_file.length_ = length;
		new_file.creation_timestamp_ = creation_timestamp;
		new_file.modified_timestamp_ = modified_timestamp;
		new_file.mimetype_ = mimetype;
		new_file.parent_id_ = parent_id;

		return new_file;
	}

	/**
	 * Creates a new {@link OCFile}
	 * 
	 * @param contentResolver The {@link ContentResolver} to use
	 * @param account The {@link Account} that this file belongs to
	 * @param path The remote path
	 * @param length The file size in bytes
	 * @param creation_timestamp The UNIX timestamp of the creation date
	 * @param modified_timestamp The UNIX timestamp of the modification date 
	 * @param mimetype The mimetype to set
	 * @param parent_id The parent folder of that file
	 * @return A new instance of {@link OCFile}
	 */
	public static OCFile createNewFile(ContentResolver contentResolver,
			Account account, String path, int length, int creation_timestamp,
			int modified_timestamp, String mimetype, long parent_id) {
		OCFile new_file = new OCFile(contentResolver, account);
		Cursor c = new_file.contentResolver_.query(
				ProviderTableMeta.CONTENT_URI_FILE, null,
				ProviderTableMeta.FILE_ACCOUNT_OWNER + "=? AND "
						+ ProviderTableMeta.FILE_PATH + "=?", new String[] {
						new_file.account_.name, path }, null);
		if (c.moveToFirst())
			new_file.setFileData(c);
		c.close();

		new_file.path_ = path;
		new_file.length_ = length;
		new_file.creation_timestamp_ = creation_timestamp;
		new_file.modified_timestamp_ = modified_timestamp;
		new_file.mimetype_ = mimetype;
		new_file.parent_id_ = parent_id;

		return new_file;
	}


	/**
	 * Gets the ID of the file
	 * 
	 * @return the file ID
	 */
	public long getFileId() {
		return id_;
	}

	/**
	 * Returns the path of the file
	 * 
	 * @return The path
	 */
	public String getPath() {
		return path_;
	}

	/**
	 * Can be used to check, whether or not this file exists in the database
	 * already
	 * 
	 * @return true, if the file exists in the database
	 */
	public boolean fileExists() {
		return id_ != -1;
	}

	/**
	 * Use this to find out if this file is a Directory
	 * 
	 * @return true if it is a directory
	 */
	public boolean isDirectory() {
		return mimetype_ != null && mimetype_.equals("DIR");
	}

	/**
	 * Use this to check if this file is available locally
	 * 
	 * @return true if it is
	 */
	public boolean isDownloaded() {
		return storage_path_ != null;
	}

	/**
	 * The path, where the file is stored locally
	 * 
	 * @return The local path to the file
	 */
	public String getStoragePath() {
		return storage_path_;
	}

	/**
	 * Can be used to set the path where the file is stored
	 * 
	 * @param storage_path
	 *            to set
	 */
	public void setStoragePath(String storage_path) {
		storage_path_ = storage_path;
	}

	/**
	 * Get a UNIX timestamp of the file creation time
	 * 
	 * @return A UNIX timestamp of the time that file was created
	 */
	public long getCreationTimestamp() {
		return creation_timestamp_;
	}

	/**
	 * Set a UNIX timestamp of the time the file was created
	 * 
	 * @param creation_timestamp
	 *            to set
	 */
	public void setCreationTimestamp(long creation_timestamp) {
		creation_timestamp_ = creation_timestamp;
	}

	/**
	 * Get a UNIX timestamp of the file modification time
	 * 
	 * @return A UNIX timestamp of the modification time
	 */
	public long getModificationTimestamp() {
		return modified_timestamp_;
	}

	/**
	 * Set a UNIX timestamp of the time the time the file was modified.
	 * 
	 * @param modification_timestamp
	 *            to set
	 */
	public void setModificationTimestamp(long modification_timestamp) {
		modified_timestamp_ = modification_timestamp;
	}

	/**
	 * Returns the filename and "/" for the root directory
	 * 
	 * @return The name of the file
	 */
	public String getFileName() {
		if (path_ != null) {
			File f = new File(path_);
			return f.getName().equals("") ? "/" : f.getName();
		}
		return null;
	}

	/**
	 * Can be used to get the Mimetype
	 * 
	 * @return the Mimetype as a String
	 */
	public String getMimetype() {
		return mimetype_;
	}

	/**
	 * Instruct the file to save itself to the database
	 */
	public void save() {
		ContentValues cv = new ContentValues();
		cv.put(ProviderTableMeta.FILE_MODIFIED, modified_timestamp_);
		cv.put(ProviderTableMeta.FILE_CREATION, creation_timestamp_);
		cv.put(ProviderTableMeta.FILE_CONTENT_LENGTH, length_);
		cv.put(ProviderTableMeta.FILE_CONTENT_TYPE, mimetype_);
		cv.put(ProviderTableMeta.FILE_NAME, getFileName());
		if (parent_id_ != 0)
			cv.put(ProviderTableMeta.FILE_PARENT, parent_id_);
		cv.put(ProviderTableMeta.FILE_PATH, path_);
		cv.put(ProviderTableMeta.FILE_STORAGE_PATH, storage_path_);
		cv.put(ProviderTableMeta.FILE_ACCOUNT_OWNER, account_.name);

		if (fileExists()) {
			if (providerClient_ != null) {
				try {
					providerClient_.update(ProviderTableMeta.CONTENT_URI, cv,
							ProviderTableMeta._ID + "=?",
							new String[] { String.valueOf(id_) });
				} catch (RemoteException e) {
					Log.e(TAG, e.getMessage());
					return;
				}
			} else {
				contentResolver_.update(ProviderTableMeta.CONTENT_URI, cv,
						ProviderTableMeta._ID + "=?",
						new String[] { String.valueOf(id_) });
			}
		} else {
			Uri new_entry = null;
			if (providerClient_ != null) {
				try {
					new_entry = providerClient_.insert(ProviderTableMeta.CONTENT_URI_FILE,
							cv);
				} catch (RemoteException e) {
					Log.e(TAG, e.getMessage());
					id_ = -1;
					return;
				}
			} else {
				new_entry = contentResolver_.insert(
						ProviderTableMeta.CONTENT_URI_FILE, cv);
			}
			try {
				String p = new_entry.getEncodedPath();
				id_ = Integer.parseInt(p.substring(p.lastIndexOf('/') + 1));
			} catch (NumberFormatException e) {
				Log.e(TAG,
						"Can't retrieve file id from uri: "
								+ new_entry.toString() + ", reason: "
								+ e.getMessage());
				id_ = -1;
			}
		}
	}

	/**
	 * List the directory content
	 * 
	 * @return The directory content or null, if the file is not a directory
	 */
	public Vector<OCFile> getDirectoryContent() {
		if (isDirectory() && id_ != -1) {
			Vector<OCFile> ret = new Vector<OCFile>();

			Uri req_uri = Uri.withAppendedPath(
					ProviderTableMeta.CONTENT_URI_DIR, String.valueOf(id_));
			Cursor c = null;
			if (providerClient_ != null) {
				try {
					c = providerClient_.query(req_uri, null, null, null, null);
				} catch (RemoteException e) {
					Log.e(TAG, e.getMessage());
					return ret;
				}
			} else {
				c = contentResolver_.query(req_uri, null, null, null, null);
			}

			if (c.moveToFirst())
				do {
					OCFile child = new OCFile(providerClient_, account_);
					child.setFileData(c);
					ret.add(child);
				} while (c.moveToNext());

			c.close();
			return ret;
		}
		return null;
	}

	/**
	 * Adds a file to this directory. If this file is not a directory, an
	 * exception gets thrown.
	 * 
	 * @param file
	 *            to add
	 * @throws IllegalStateException
	 *             if you try to add a something and this is not a directory
	 */
	public void addFile(OCFile file) throws IllegalStateException {
		if (isDirectory()) {
			file.parent_id_ = id_;
			file.save();
			return;
		}
		throw new IllegalStateException(
				"This is not a directory where you can add stuff to!");
	}

	/**
	 * Used internally. Reset all file properties
	 */
	private void resetData() {
		id_ = -1;
		path_ = null;
		parent_id_ = 0;
		storage_path_ = null;
		mimetype_ = null;
		length_ = 0;
		creation_timestamp_ = 0;
		modified_timestamp_ = 0;
	}

	/**
	 * Used internally. Set properties based on the information in a {@link android.database.Cursor}
	 * @param c the Cursor containing the information
	 */
	private void setFileData(Cursor c) {
		resetData();
		if (c != null) {
			id_ = c.getLong(c.getColumnIndex(ProviderTableMeta._ID));
			path_ = c.getString(c.getColumnIndex(ProviderTableMeta.FILE_PATH));
			parent_id_ = c.getLong(c
					.getColumnIndex(ProviderTableMeta.FILE_PARENT));
			storage_path_ = c.getString(c
					.getColumnIndex(ProviderTableMeta.FILE_STORAGE_PATH));
			mimetype_ = c.getString(c
					.getColumnIndex(ProviderTableMeta.FILE_CONTENT_TYPE));
			length_ = c.getLong(c
					.getColumnIndex(ProviderTableMeta.FILE_CONTENT_LENGTH));
			creation_timestamp_ = c.getLong(c
					.getColumnIndex(ProviderTableMeta.FILE_CREATION));
			modified_timestamp_ = c.getLong(c
					.getColumnIndex(ProviderTableMeta.FILE_MODIFIED));
		}
	}
}