package org.openslx.imagemaster.db;

import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import org.openslx.imagemaster.Globals;
import org.openslx.imagemaster.serverconnection.UploadingImage;
import org.openslx.imagemaster.thrift.iface.ImageData;
import org.openslx.imagemaster.util.Util;

/**
 * Representing an image in the database.
 * Is used to modify/update database entries.
 */
public class DbImage
{

	public final String uuid;
	public final int imageVersion;
	public final String imageName;
	public final String imagePath;
	public final Timestamp imageCreateTime;
	public final Timestamp imageUpdateTime;
	public final String imageOwner;
	public final String contentOperatingSystem;
	public final boolean isValid;
	public final boolean isDeleted;
	public final String shortDescription;
	public final String longDescription;
	public final Timestamp timestamp;
	public final long fileSize;
	public final String token;
	public final int[] blockStatus;
	public final String serverSessionId;

	public DbImage(String uuid)
	{
		this.uuid = uuid;
		this.imageVersion = 0;
		this.imageName = null;
		this.imagePath = null;
		this.imageCreateTime = null;
		this.imageUpdateTime = null;
		this.imageOwner = null;
		this.contentOperatingSystem = null;
		this.isValid = false;
		this.isDeleted = false;
		this.shortDescription = null;
		this.longDescription = null;
		this.timestamp = new Timestamp( 0 );
		this.fileSize = 0;
		this.token = null;
		this.blockStatus = null;
		this.serverSessionId = null;
	}

	public DbImage(String uuid, int imageVersion, String imageName, String imagePath,
			Timestamp imageCreateTime, Timestamp imageUpdateTime, String imageOwner, String contentOperatingSystem,
			boolean isValid, boolean isDeleted, String shortDescription, String longDescription,
			Timestamp timestamp, long fileSize, String token, String missingBlocksList, String serverSessionId)
	{
		this.uuid = uuid;
		this.imageVersion = imageVersion;
		this.imageName = imageName;
		this.imagePath = imagePath;
		this.imageCreateTime = imageCreateTime;
		this.imageUpdateTime = imageUpdateTime;
		this.imageOwner = imageOwner;
		this.contentOperatingSystem = contentOperatingSystem;
		this.isValid = isValid;
		this.isDeleted = isDeleted;
		this.shortDescription = shortDescription;
		this.longDescription = longDescription;
		this.timestamp = timestamp;
		this.fileSize = fileSize;
		this.token = token;

		String[] parts = missingBlocksList.split( ";" );
		blockStatus = new int[ Util.getNumberOfBlocks( fileSize, Globals.blockSize ) ];		// initialize array to ones
		for ( int i : blockStatus ) {
			blockStatus[i] = UploadingImage.valid;
		}
		for ( int i = 0; i < parts.length; i++ ) {
			blockStatus[i] = UploadingImage.missing;
		}

		this.serverSessionId = serverSessionId;
	}

	/**
	 * Check if image with imageData already exists. (Only checks the UUID.)
	 * 
	 * @param imageData
	 * @return
	 */
	public static boolean exists( String uuid )
	{
		return getImageByUuid( uuid ) != null;
	}

	/**
	 * Insert a new image into database
	 * 
	 * @param imageData The metadata of the image
	 * @param ts The timestamp of inserting
	 * @param token The token that is able to upload this image
	 * @param amountBlocks The blocks that are missing for this image
	 * @param serverSessionId The server that is uploading this image
	 * @return Affected rows
	 */
	public static int insert( ImageData imageData, long ts, String token, int amountBlocks, String serverSessionId, String filepath )
	{
		Date createTime = new Date( imageData.imageCreateTime );
		Date updateTime = new Date( imageData.imageUpdateTime );
		Date timestamp = new Date( ts );
		SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss" );

		String missingBlocksList = "";
		for ( int i = 0; i < amountBlocks; i++ ) {
			missingBlocksList = missingBlocksList + String.valueOf( i ) + ";";
		}

		return MySQL
				.update(
						"INSERT INTO images (UUID, image_version, image_name, image_path, image_createTime, image_updateTime, image_owner, content_operatingSystem, status_isValid, status_isDeleted, image_shortDescription, image_longDescription, timestamp, fileSize, token, missingBlocks, serverSessionId) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
						imageData.uuid, imageData.imageVersion, imageData.imageName, filepath,
						sdf.format( createTime ), sdf.format( updateTime ), imageData.imageOwner,
						imageData.contentOperatingSystem, imageData.statusIsValid,
						imageData.statusIsDeleted, imageData.imageShortDescription,
						imageData.imageLongDescription, sdf.format( timestamp ), imageData.fileSize,
						token, missingBlocksList, serverSessionId );
	}

	public String getUuid()
	{
		return this.uuid;
	}

	/**
	 * Updates the missing blocks of an uploading image.
	 * 
	 * @param missingBlocks
	 * @return
	 */
	public int updateMissingBlocks( List<Integer> missingBlocks )
	{
		String missingBlocksList = "";
		if ( missingBlocks != null ) {
			for ( Integer block : missingBlocks ) {
				missingBlocksList = missingBlocksList + String.valueOf( block ) + ";";
			}
		}
		return MySQL.update( "UPDATE images SET images.missingBlocks = ? WHERE images.UUID = ?", missingBlocksList, uuid );
	}

	/**
	 * Updates the database with a new version of an image and its missing blocks.
	 * 
	 * @param version
	 * @param amountBlocks
	 */
	public void updateVersion( int version, int amountBlocks )
	{
		if ( version <= 0 || amountBlocks <= 0 )
			return;
		String missingBlocksList = "";
		for ( int i = 0; i < amountBlocks; i++ ) {
			missingBlocksList = missingBlocksList + String.valueOf( i ) + ";";
		}
		MySQL.update( "UPDATE images SET images.missingBlocks, images.version VALUES (?, ?)", missingBlocksList, version );
	}

	/**
	 * Marks an image as _deleted_ in the database.
	 * 
	 * @return
	 */
	public int delete()
	{
		return MySQL.update( "UPDATE images SET images.isDeleted=? WHERE images.UUID=?", true, uuid );
	}

	/**
	 * Returns all images from database where blocks are still missing.
	 * 
	 * @return
	 */
	public static List<DbImage> getUploadingImages()
	{
		return MySQL
				.findAll(
						DbImage.class,
						"SELECT images.UUID, images.image_version, images.image_name, images.image_path, images.image_createTime, images.image_updateTime, images.image_owner, images.content_operatingSystem, images.status_isValid, images.status_isDeleted, images.image_shortDescription, images.image_longDescription, images.timestamp, images.fileSize, images.token, images.missingBlocks, images.serverSessionId FROM images WHERE missingBlocks != ?",
						"" );
	}

	/**
	 * Returns the image that is corrsponding to a specified uuid.
	 * 
	 * @param uuid
	 * @return
	 */
	public static DbImage getImageByUuid( String uuid )
	{
		return MySQL
				.findUniqueOrNull(
						DbImage.class,
						"SELECT images.UUID, images.image_version, images.image_name, images.image_path, images.image_createTime, images.image_updateTime, images.image_owner, images.content_operatingSystem, images.status_isValid, images.status_isDeleted, images.image_shortDescription, images.image_longDescription, images.timestamp, images.fileSize, images.token, images.missingBlocks, images.serverSessionId FROM images WHERE uuid = ?",
						uuid );
	}

	/**
	 * Creates an instance of the thrift ImageData class of this DbImage object.
	 * 
	 * @return The corresponding image data
	 */
	public ImageData getImageData()
	{
		return new ImageData( this.uuid, this.imageVersion, this.imageName, this.imageCreateTime.getTime(),
				this.imageUpdateTime.getTime(), this.imageOwner, this.contentOperatingSystem, this.isValid,
				this.isDeleted, this.shortDescription, this.longDescription, this.fileSize );
	}
}