/*
 *	Copyright © Dave Perrett and Malcolm Jarvis
 *	This code is licensed under the GPL version 2.
 *	For details, see http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 *
 *	Class Torrent
 */

function Torrent( transferListParent, fileListParent, controller, data) {
    this.initialize( transferListParent, fileListParent, controller, data);
} 

// Constants
Torrent._StatusWaitingToCheck  = 1;
Torrent._StatusChecking        = 2;
Torrent._StatusDownloading     = 4;
Torrent._StatusSeeding         = 8;
Torrent._StatusPaused          = 16;
Torrent._InfiniteTimeRemaining = 215784000; // 999 Hours - may as well be infinite

Torrent.prototype =
{
	/*
	 * Constructor
	 */
	initialize: function( transferListParent, fileListParent, controller, data) {
		this._id            = data.id;
		this._is_private    = data.isPrivate;
		this._hashString    = data.hashString;
		this._date          = data.addedDate;
		this._size          = data.totalSize;
		this._tracker       = data.announceURL;
		this._comment       = data.comment;
		this._creator       = data.creator;
		this._creator_date  = data.dateCreated;
		this._sizeWhenDone  = data.sizeWhenDone;
		this._name          = data.name;
		this._name_lc       = this._name.toLowerCase( );
		this._file_model    = [ ];
		this._file_view     = [ ];

		// Create a new <li> element
		var top_e = document.createElement( 'li' );
		top_e.className = 'torrent';
		top_e.id = 'torrent_' + data.id;
		top_e._torrent = this;
		var element = $(top_e);
		element._torrent = this;
		this._element = element;
		this._controller = controller;
		controller._rows.push( element );
		
		// Create the 'name' <div>
		var e = document.createElement( 'div' );
		e.className = 'torrent_name';
		top_e.appendChild( e );
		element._name_container = e;
		
		// Create the 'progress details' <div>
		e = document.createElement( 'div' );
		e.className = 'torrent_progress_details';
		top_e.appendChild( e );
		element._progress_details_container = e;

		// Create the 'in progress' bar
		e = document.createElement( 'div' );
		e.className = 'torrent_progress_bar incomplete';
		e.style.width = '0%';
		top_e.appendChild( e );
		element._progress_complete_container = e;
			
		// Create the 'incomplete' bar (initially hidden)
		e = document.createElement( 'div' );
		e.className = 'torrent_progress_bar incomplete';
		e.style.display = 'none';
		top_e.appendChild( e );
		element._progress_incomplete_container = e;
		
		// Add the pause/resume button - don't specify the
		// image or alt text until the 'refresh()' function
		// (depends on torrent state)
		var image = document.createElement( 'div' );
		image.className = 'torrent_pause';
		e = document.createElement( 'a' );
		e.appendChild( image );
		top_e.appendChild( e );
		element._pause_resume_button_image = image;
		if (!iPhone) $(e).bind('click', {element: element}, this.clickPauseResumeButton);
		
		// Create the 'peer details' <div>
		e = document.createElement( 'div' );
		e.className = 'torrent_peer_details';
		top_e.appendChild( e );
		element._peer_details_container = e;
		
		// Set the torrent click observer
		element.bind('click', {element: element}, this.clickTorrent);
		
		// Safari hack - first torrent needs to be moved down for some reason. Seems to be ok when
		// using <li>'s in straight html, but adding through the DOM gets a bit odd.
		if ($.browser.safari)
			this._element.css('margin-top', '7px');

		this.initializeTorrentFilesInspectorGroup( fileListParent );

		if( data.files ) {
			for( var i=0, row; row=data.files[i]; ++i ) {
				this._file_model[i] = {
					'index': i,
					'torrent': this,
					'length': row.length,
					'name': row.name
				};
			}
		}

		// Update all the labels etc
		this.refresh(data);
		
		// insert the element
		transferListParent.appendChild(top_e);
	},
	
	initializeTorrentFilesInspectorGroup: function( fileListParent ) {
		var e = document.createElement( 'ul' );
		e.className = 'inspector_torrent_file_list inspector_group';
		e.style.display = 'none';
		fileListParent.appendChild( e );
		this._fileList = e;
	},
	
	fileList: function() {
		return $(this._fileList);
	},
	
	/*--------------------------------------------
	 * 
	 *  S E T T E R S   /   G E T T E R S
	 * 
	 *--------------------------------------------*/
	
	/* Return the DOM element for this torrent (a <LI> element) */
	element: function() {
		return this._element;
	},

	setElement: function( element ) {
		this._element = element;
		element._torrent = this;
		element[0]._torrent = this;
		this.refreshHTML( );
	},

	activity: function() { return this._download_speed + this._upload_speed; },
	comment: function() { return this._comment; },
	completed: function() { return this._completed; },
	creator: function() { return this._creator; },
	dateAdded: function() { return this._date; },
	downloadSpeed: function() { return this._download_speed; },
	downloadTotal: function() { return this._download_total; },
	errorMessage: function() { return this._error_message; },
	hash: function() { return this._hashString; },
	id: function() { return this._id; },
	isActive: function() { return this.state() != Torrent._StatusPaused; },
	isDownloading: function() { return this.state() == Torrent._StatusDownloading; },
	isSeeding: function() { return this.state() == Torrent._StatusSeeding; },
	name: function() { return this._name; },
	peersSendingToUs: function() { return this._peers_sending_to_us; },
	peersGettingFromUs: function() { return this._peers_getting_from_us; },
	getPercentDone: function() {
		if( !this._sizeWhenDone ) return 1.0;
		if( !this._leftUntilDone ) return 1.0;
		return ( this._sizeWhenDone - this._leftUntilDone ) / this._sizeWhenDone;
	},
	getPercentDoneStr: function() {
		return Math.floor(100 * Math.ratio( 100 * ( this._sizeWhenDone - this._leftUntilDone ),
		                           this._sizeWhenDone )) / 100;
	},
	size: function() { return this._size; },
	state: function() { return this._state; },
	stateStr: function() {
		switch( this.state() ) {
			case Torrent._StatusSeeding:        return 'Seeding';
			case Torrent._StatusDownloading:    return 'Downloading';
			case Torrent._StatusPaused:         return 'Paused';
			case Torrent._StatusChecking:       return 'Verifying local data';
			case Torrent._StatusWaitingToCheck: return 'Waiting to verify';
			default:                            return 'error';
		}
	},
	swarmSpeed: function() { return this._swarm_speed; },
	totalLeechers: function() { return this._total_leechers; },
	totalSeeders: function() { return this._total_seeders; },
	uploadSpeed: function() { return this._upload_speed; },
	uploadTotal: function() { return this._upload_total; },
	showFileList: function() {
		if(this.fileList().is(':visible'))
			return;
		this.ensureFileListExists();
		this.refreshFileView();
		this.fileList().show();
	},
	hideFileList: function() { this.fileList().hide(); },
	
	/*--------------------------------------------
	 * 
	 *  E V E N T   F U N C T I O N S
	 * 
	 *--------------------------------------------*/
	
	/*
	 * Process a click event on this torrent
	 */
	clickTorrent: function( event )
	{
		// Prevents click carrying to parent element
		// which deselects all on click
		event.stopPropagation();
		var torrent = event.data.element._torrent;
		
		// 'Apple' button emulation on PC :
		// Need settable meta-key and ctrl-key variables for mac emulation
		var meta_key = event.metaKey;
		var ctrl_key = event.ctrlKey;
		if (event.ctrlKey && navigator.appVersion.toLowerCase().indexOf("mac") == -1) {
			meta_key = true;
			ctrl_key = false;
		}
		
		// Shift-Click - Highlight a range between this torrent and the last-clicked torrent
		if (iPhone) {
			torrent._controller.setSelectedTorrent( torrent, true );
		
		} else if (event.shiftKey) {
			torrent._controller.selectRange( torrent, true );
			// Need to deselect any selected text
			window.focus();
		
		// Apple-Click, not selected
		} else if (!torrent.isSelected() && meta_key) {
			torrent._controller.selectTorrent( torrent, true );
			
		// Regular Click, not selected
		} else if (!torrent.isSelected()) {
			torrent._controller.setSelectedTorrent( torrent, true );
		
		// Apple-Click, selected	
		} else if (torrent.isSelected() && meta_key) {
			torrent._controller.deselectTorrent( torrent, true );
			
		// Regular Click, selected
		} else if (torrent.isSelected()) {
			torrent._controller.setSelectedTorrent( torrent, true );
		}
		
		torrent._controller.setLastTorrentClicked(torrent);
	},

	/*
	 * Process a click event on the pause/resume button
	 */
	clickPauseResumeButton: function( event )
	{
		// prevent click event resulting in selection of torrent
		event.stopPropagation();

		// either stop or start the torrent
		var torrent = event.data.element._torrent;
		if( torrent.isActive( ) )
			torrent._controller.stopTorrent( torrent );
		else
			torrent._controller.startTorrent( torrent );
	},

	/*--------------------------------------------
	 * 
	 *  I N T E R F A C E   F U N C T I O N S
	 * 
	 *--------------------------------------------*/
	
	refresh: function(data) {
		this.refreshData( data );
		this.refreshHTML( );
	},

	/*
	 * Refresh display
	 */
	refreshData: function(data) {
		this._completed             = data.haveUnchecked + data.haveValid;
		this._verified              = data.haveValid;
		this._leftUntilDone         = data.leftUntilDone;
		this._download_total        = data.downloadedEver;
		this._upload_total          = data.uploadedEver;
		this._download_speed        = data.rateDownload;
		this._upload_speed          = data.rateUpload;
		this._peers_connected       = data.peersConnected;
		this._peers_getting_from_us = data.peersGettingFromUs;
		this._peers_sending_to_us   = data.peersSendingToUs;
		this._error                 = data.error;
		this._error_message         = data.errorString;
		this._eta                   = data.eta;
		this._swarm_speed           = data.swarmSpeed;
		this._total_leechers        = Math.max( 0, data.leechers );
		this._total_seeders         = Math.max( 0, data.seeders );
		this._state                 = data.status;

		if (data.fileStats)
			this.refreshFileModel( data );
	},

	refreshFileModel: function(data) {
		for( var i=0; i<data.fileStats.length; ++i ) {
			var src = data.fileStats[i];
			var tgt = this._file_model[i];
			if( !tgt )
				tgt = this._file_model[i] = { };
			tgt.wanted = src.wanted;
			tgt.priority = src.priority;
			tgt.bytesCompleted = src.bytesCompleted;
		}
	},

	refreshHTML: function() {
		var c;
		var e;
		var progress_details;
		var peer_details;
		var root = this._element;
		var MaxBarWidth = 100; // reduce this to make the progress bar shorter (%)
		
		setInnerHTML( root._name_container, this._name );
		
		// Add the progress bar
                var notDone = this._leftUntilDone > 0;

		// Fix for situation
		// when a verifying/downloading torrent gets state seeding
		if( this._state === Torrent._StatusSeeding )
			notDone = false ;
		
		if( notDone )
		{
			var eta = '';
			
			if( this.isActive( ) )
			{
				eta = '-';
				if (this._eta < 0 || this._eta >= Torrent._InfiniteTimeRemaining )
					eta += 'remaining time unknown';
				else
					eta += Math.formatSeconds(this._eta) + ' remaining';
			}
			
			// Create the 'progress details' label
			// Eg: '101 MB of 631 MB (16.02%) - 2 hr remaining'
			c = Math.formatBytes( this._sizeWhenDone - this._leftUntilDone );
			c += ' of ';
			c += Math.formatBytes( this._sizeWhenDone );
			c += ' (';
			c += this.getPercentDoneStr();
			c += '%)';
			c += eta;
			progress_details = c;
		
			// Figure out the percent completed
			var css_completed_width = Math.floor( this.getPercentDone() * 100 * MaxBarWidth ) / 100;
			
			// Update the 'in progress' bar
			e = root._progress_complete_container;
			c = 'torrent_progress_bar';
			c += this.isActive() ? ' in_progress' : ' incomplete_stopped';
			if(css_completed_width === 0) { c += ' empty'; }
			e.className = c;
			e.style.width = css_completed_width + '%';
			
			// Update the 'incomplete' bar
			e = root._progress_incomplete_container;
			if( e.className.indexOf( 'incomplete' ) === -1 )
				e.className = 'torrent_progress_bar in_progress';
			e.style.width =  (MaxBarWidth - css_completed_width) + '%';
			e.style.display = 'block';
			
			// Create the 'peer details' label
			// Eg: 'Downloading from 36 of 40 peers - DL: 60.2 KB/s UL: 4.3 KB/s'
			if( !this.isDownloading( ) )
				c = this.stateStr( );
			else {
				c = 'Downloading from ';
				c += this.peersSendingToUs();
				c += ' of ';
				c += this._peers_connected;
				c += ' peers - DL: ';
				c += Math.formatBytes(this._download_speed);
				c += '/s UL: ';
				c += Math.formatBytes(this._upload_speed);
				c += '/s';
			}
			peer_details = c;
			
		}
		else
		{
			// Update the 'in progress' bar
			e = root._progress_complete_container;
			c = 'torrent_progress_bar';
			c += (this.isActive()) ? ' complete' : ' complete_stopped';
			e.className = c;
			
			// Create the 'progress details' label
			// Eg: '698.05 MB, uploaded 8.59 GB (Ratio: 12.3)'
			c = Math.formatBytes( this._size );
			c += ', uploaded ';
			c += Math.formatBytes( this._upload_total );
			c += ' (Ratio ';
			c += Math.ratio( this._upload_total, this._download_total );
			c += ')';
			progress_details = c;
			
			// Hide the 'incomplete' bar
			root._progress_incomplete_container.style.display = 'none';
			
			// Set progress to maximum
			root._progress_complete_container.style.width =  MaxBarWidth + '%';
			
			// Create the 'peer details' label
			// Eg: 'Seeding to 13 of 22 peers - UL: 36.2 KB/s'
			if( !this.isSeeding( ) )
				c = this.stateStr( );
			else {
				c = 'Seeding to ';
				c += this.peersGettingFromUs();
				c += ' of ';
				c += this._peers_connected;
				c += ' peers - UL: ';
				c += Math.formatBytes(this._upload_speed);
				c += '/s';
			}
			peer_details = c;
		}
		
		// Update the progress details
		setInnerHTML( root._progress_details_container, progress_details );
		
		// Update the peer details and pause/resume button
		e = root._pause_resume_button_image;
		if ( this.state() === Torrent._StatusPaused ) {
			e.alt = 'Resume';
			e.className = "torrent_resume";
		} else {
			e.alt = 'Pause';
			e.className = "torrent_pause";
		}
		
		if( this._error_message &&
		    this._error_message !== '' &&
		    this._error_message !== 'other' ) {
			peer_details = this._error_message;
		}
		
		setInnerHTML( root._peer_details_container, peer_details );
	
		this.refreshFileView( );	
	},

	refreshFileView: function() {
		if( this._file_view.length )
			for( var i=0; i<this._file_model.length; ++i )
				this._file_view[i].update( this._file_model[i] );
	},

	ensureFileListExists: function() {
		if( this._file_view.length == 0 ) {
			if(this._file_model.length == 1)
				this._fileList.className += ' single_file';
			var v, e;
			for( var i=0; i<this._file_model.length; ++i ) {
				v = new TorrentFile( this._file_model[i] );
				this._file_view[i] = v;
				e = v.domElement( );
				e.className = (i % 2 ? 'even' : 'odd') + ' inspector_torrent_file_list_entry';
				this._fileList.appendChild( e );
			}
		}
	},

	deleteFiles: function(){
		if (this._fileList)
			$(this._fileList).remove();
	},

	/*
	 * Return true if this torrent is selected
	 */
	isSelected: function() {
		return this.element()[0].className.indexOf('selected') != -1;
	},

	/**
	 * @param filter one of Prefs._Filter*
	 * @param search substring to look for, or null
	 * @return true if it passes the test, false if it fails
	 */
	test: function( filter, search )
	{
		var pass = false;
		
		switch( filter )
		{
			case Prefs._FilterSeeding:
				pass = this.isSeeding();
				break;
			case Prefs._FilterDownloading:
				pass = this.isDownloading();
				break;
			case Prefs._FilterPaused:
				pass = !this.isActive();
				break;
			default:
				pass = true;
				break;
		}
		
		if( !pass )
			return false;
		
		if( !search || !search.length )
			return pass;
		
		return this._name_lc.indexOf( search.toLowerCase() ) !== -1;
	}
};

/** Helper function for Torrent.sortTorrents(). */
Torrent.compareById = function( a, b ) {
	return a.id() - b.id();
};

/** Helper function for sortTorrents(). */
Torrent.compareByAge = function( a, b ) {
	return a.dateAdded() - b.dateAdded();
};

/** Helper function for sortTorrents(). */
Torrent.compareByName = function( a, b ) {
	return a._name_lc.compareTo( b._name_lc );
};

/** Helper function for sortTorrents(). */
Torrent.compareByTracker = function( a, b ) {
	return a._tracker.compareTo( b._tracker );
};

/** Helper function for sortTorrents(). */
Torrent.compareByState = function( a, b ) {
	return a.state() - b.state();
};

/** Helper function for sortTorrents(). */
Torrent.compareByActivity = function( a, b ) {
	return a.activity() - b.activity();
};

/** Helper function for sortTorrents(). */
Torrent.compareByProgress = function( a, b ) {
	if( a.getPercentDone() !== b.getPercentDone() )
		return a.getPercentDone() - b.getPercentDone();
	var a_ratio = Math.ratio( a._upload_total, a._download_total );
	var b_ratio = Math.ratio( b._upload_total, b._download_total );
	return a_ratio - b_ratio;
};

/**
 * @param torrents an array of Torrent objects
 * @param sortMethod one of Prefs._SortBy*
 * @param sortDirection Prefs._SortAscending or Prefs._SortDescending
 */
Torrent.sortTorrents = function( torrents, sortMethod, sortDirection )
{
	switch( sortMethod )
	{
		case Prefs._SortByActivity:
			torrents.sort( this.compareByActivity );
			break;
		case Prefs._SortByAge:
			torrents.sort( this.compareByAge );
			break;
		case Prefs._SortByQueue:
			torrents.sort( this.compareById );
			break;
		case Prefs._SortByProgress:
			torrents.sort( this.compareByProgress );
			break;
		case Prefs._SortByState:
			torrents.sort( this.compareByState );
			break;
		case Prefs._SortByTracker:
			torrents.sort( this.compareByTracker );
			break;
		case Prefs._SortByName:
			torrents.sort( this.compareByName );
			break;
		default:
			console.warn( "unknown sort method: " + sortMethod );
			break;
	}
	
	if( sortDirection === Prefs._SortDescending )
		torrents.reverse( );
	
	return torrents;
};

/**
 * @brief fast binary search to find a torrent
 * @param torrents an array of torrents sorted by Id
 * @param id the id to search for
 * @return the index, or -1
 */
Torrent.indexOf = function( torrents, id )
{
	var low = 0;
	var high = torrents.length;
	while( low < high ) {
		var mid = Math.floor( ( low + high ) / 2 );
		if( torrents[mid].id() < id )
			low = mid + 1;
		else
			high = mid;
	}
	if( ( low < torrents.length ) && ( torrents[low].id() == id ) ) {
		return low;
	} else {
		return -1; // not found
	}
};

/**
 * @param torrents an array of torrents sorted by Id
 * @param id the id to search for
 * @return the torrent, or null
 */
Torrent.lookup = function( torrents, id )
{
	var immutable_array = torrents.slice();
	var pos = Torrent.indexOf( immutable_array, id );
	return pos >= 0 ? immutable_array[pos] : null;
};

function TorrentFile(file_data) {
	this.initialize(file_data);
}

TorrentFile.prototype = {
	initialize: function(file_data) {
		this._dirty = true;
		this._torrent = file_data.torrent;
		this._index = file_data.index;
		var name = file_data.name.substring (file_data.name.lastIndexOf('/')+1);
		this.readAttributes(file_data);

		var li = document.createElement('li');
		li.id = 't' + this._torrent.id() + 'f' + this._index;
		li.classNameConst = 'inspector_torrent_file_list_entry ' + ((this._index%2)?'odd':'even');
		li.className = li.classNameConst;

		var wanted_div = document.createElement('div');
		wanted_div.className = "file_wanted_control";

		var pri_div = document.createElement('div');
		pri_div.classNameConst = "file_priority_control";
		pri_div.className = pri_div.classNameConst;

		var file_div = document.createElement('div');
		file_div.className = "inspector_torrent_file_list_entry_name";
		file_div.innerHTML = name.replace(/([\/_\.])/g, "$1&#8203;");

		var prog_div = document.createElement('div');
		prog_div.className = "inspector_torrent_file_list_entry_progress";

		li.appendChild(wanted_div);
		li.appendChild(pri_div);
		li.appendChild(file_div);
		li.appendChild(prog_div);
		
		this._element = li;
		this._priority_control = pri_div;
		this._progress = $(prog_div);
	},

	update: function(file_data) {
		this.readAttributes(file_data);
		this.refreshHTML();
	},

	isDone: function () {
		return this._done >= this._size;
	},

	isEditable: function () {
		return (this._torrent._file_model.length>1) && !this.isDone();
	},
	
	readAttributes: function(file_data) {
		if( file_data.index !== undefined && file_data.index !== this._index ) {
			this._index = file_data.index;
			this._dirty = true;
		}
		if( file_data.bytesCompleted !== undefined && file_data.bytesCompleted !== this._done ) {
			this._done   = file_data.bytesCompleted;
			this._dirty = true;
		}
		if( file_data.length !== undefined && file_data.length !== this._size ) {
			this._size   = file_data.length;
			this._dirty = true;
		}
		if( file_data.priority !== undefined && file_data.priority !== this._prio ) {
			this._prio   = file_data.priority;
			this._dirty = true;
		}
		if( file_data.wanted !== undefined && file_data.wanted !== this._wanted ) {
			this._wanted = file_data.wanted;
			this._dirty = true;
		}
	},
	
	element: function() {
		return $(this._element);
	},
	
	domElement: function() {
		return this._element;
	},
	
	setPriority: function(prio) {
		if (this.isEditable()) {
			var cmd;
			switch( prio ) {
				case  1: cmd = 'priority-high';   break;
				case -1: cmd = 'priority-low';    break;
				default: cmd = 'priority-normal'; break;
			}
			this._prio = prio;
			this._dirty = true;
			this._torrent._controller.changeFileCommand( cmd, this._torrent, this );
		}
	},
	
	setWanted: function(wanted) {
		this._dirty = true;
		this._wanted = wanted;
		this.element().toggleClass( 'skip', !wanted );
		var command = wanted ? 'files-wanted' : 'files-unwanted';
		this._torrent._controller.changeFileCommand(command, this._torrent, this);
	},
	
	toggleWanted: function() {
		if (this.isEditable())
			this.setWanted( !this._wanted );
	},
	
	refreshHTML: function() {
		if( this._dirty ) {
			this._dirty = false;
			this.refreshProgressHTML();
			this.refreshWantedHTML();
			this.refreshPriorityHTML();
		}
	},
	
	refreshProgressHTML: function() {
		var c = Math.formatBytes(this._done);
		c += ' of ';
		c += Math.formatBytes(this._size);
		c += ' (';
		c += Math.ratio(100 * this._done, this._size);
		c += '%)';
		setInnerHTML(this._progress[0], c);
	},
	
	refreshWantedHTML: function() {
		var e = this.domElement();
		var c = e.classNameConst;
		if(!this._wanted) { c += ' skip'; }
		if(this.isDone()) { c += ' complete'; }
		e.className = c;
	},
	
	refreshPriorityHTML: function() {
		var e = this._priority_control;
		var c = e.classNameConst;
		switch( this._prio ) {
			case 1: c += ' high'; break;
			case -1: c += ' low'; break;
			default: c += ' normal'; break;
		}
		e.className = c;
	},
	
	fileWantedControlClicked: function(event) {
		this.toggleWanted();
	},
	
	filePriorityControlClicked: function(event, element) {
		var x = event.pageX;
		while (element !== null) {
			x = x - element.offsetLeft;
			element = element.offsetParent;
		}

		var prio;
		if( x < 12 ) prio = -1;
		else if( x < 23 ) prio = 0;
		else prio = 1;
		this.setPriority( prio );
	}
};