Vn.Shelves = new Class
({
	Extends: Vn.Module

	,activate: function ()
	{
		this.$('report-title').value = 'Anthuriums';
		this.$('warehouse').value = 44;
		this.$('date').value = new Date ();
		this.$('shelf').value = 1;
		this.$('reign').value = 1;
		this.$('family').value = 2;
		this.$('filter').value = 'Ant %';
		this.$('max-amount').value = 50;
	}
	
	,onPreviewClick: function ()
	{
		var report = new Vn.ShelvesReport ({conn: this.conn});
		report.setParams (
			this.$('report-title').value,
			this.$('warehouse').value,
			this.$('date').value,
			this.$('family').value,
			this.$('filter').value,
			this.$('max-amount').value,
			this.$('shelf').value
		);
		report.open ();
	}
});

Vn.ShelvesReport = new Class
({
	Extends: Vn.Report

	,nItem: -1
	,nColors: 4
	
	,setParams: function (title, warehouse, date, type, filter, maxAmount, shelf)
	{
		this.title = title;
		this.maxAmount = maxAmount;
		
		var batch = new Sql.Batch ();
		batch.addValue ('shelf', shelf);
		batch.addValue ('wh', warehouse);
		batch.addValue ('date', date);
		batch.addValue ('type', type);
		batch.addValue ('filter', filter);
		this.batch = batch;
	}
	
	,open: function ()
	{
		var query =
			'SELECT id, name, width, height, max_height, tray_height, '+
			'first_tray_elevation, tray_density, vspacing, hspacing '+
				'FROM vn2008.shelf WHERE id = #shelf; '+
			'CALL item_organizer (#wh, #date, #type, #filter)';
		
		this.conn.execQuery (query, this.onQueryExec.bind (this), this.batch);
	}
	
	,onQueryExec: function (resultSet)
	{
		// Fetch query data

		var res = resultSet.fetchResult ();
		res.next ();
		
		var scale = 0.065;
		
		var shelf = this.shelf =
		{
			 width: res.get ('width') * scale
			,height: res.get ('height') * scale
			,maxHeight: res.get ('max_height') * scale
			,trayHeight: res.get ('tray_height') * scale
			,firstTrayElevation: res.get ('first_tray_elevation') * scale
			,trayDensity: res.get ('tray_density') * scale
			,vspacing: res.get ('vspacing') * scale
			,hspacing: res.get ('hspacing') * scale
		};
		
		var items = [];
		var res = resultSet.fetchResult ();
		
		while (res.next ())
			items.push ({
				 name: res.get ('Article') +' x'+ res.get ('Medida')
				,boxHeight: res.get ('z') * 10 * scale
				,boxWidth: res.get ('x') * 10 * scale
				,amount: res.get ('etiquetas')
			});

		// Intializes the allocator
			
		alloc = new Vn.Allocator ();
		alloc.items = items;
		alloc.maxAmount = this.maxAmount;
		alloc.shelfFunc = this.drawShelf.bind (this);
		alloc.boxFunc = this.drawBox.bind (this);

		alloc.nTrays = Math.ceil (
			(shelf.height - shelf.firstTrayElevation) /
			(shelf.trayHeight + shelf.trayDensity)
		);
		alloc.trayWidth = shelf.width - shelf.hspacing * 2;
		alloc.trayHeight = shelf.trayHeight - shelf.vspacing;
		alloc.topTrayHeight = shelf.maxHeight - shelf.vspacing
			- shelf.firstTrayElevation - (alloc.nTrays - 1) * shelf.trayHeight;
		
		// Opens the report
		
		this.createWindow ('shelves');
		alloc.run ();
	}

	,drawShelf: function (allocator)
	{
		var shelf = this.shelf;

		var sheet = this.doc.createElement ('div');
		sheet.className = 'sheet';
/*		sheet.style.top = (allocator.currentShelf * 297) +'mm';
*/		this.doc.body.appendChild (sheet);
		
		// Draws the title
		
		var title = this.doc.createElement ('h1');
		title.className = 'title';
		title.appendChild (this.doc.createTextNode (this.title));
		sheet.appendChild (title);
		
		var pageNumber = this.doc.createElement ('h1');
		pageNumber.className = 'page-number';
		pageNumber.appendChild (this.doc.createTextNode (allocator.currentShelf + 1));
		sheet.appendChild (pageNumber);

		// Draws the shelf
		
		var shelfDiv = this.shelfDiv = this.doc.createElement ('div');
		shelfDiv.className = 'shelf';
		shelfDiv.style.width = this.shelf.width +'mm';
		shelfDiv.style.height = this.shelf.maxHeight +'mm';
		sheet.appendChild (shelfDiv);

		this.drawEdge ().style.left = 0;
		this.drawEdge ().style.right = 0;

		// Draws trays

		var lastTrayY = shelf.firstTrayElevation;

		if (shelf.trayHeight > 0)
		while (lastTrayY + shelf.trayDensity < shelf.height)
		{
			var tray = this.doc.createElement ('div');
			tray.className = 'tray';
			tray.style.width = this.shelf.width +'mm';
			tray.style.height = '1mm';
			tray.style.bottom = lastTrayY +'mm';
			shelfDiv.appendChild (tray);

			lastTrayY += shelf.trayHeight + shelf.trayDensity;
		}
	}
	
	,drawEdge: function (shelfDiv)
	{
		var edge = this.doc.createElement ('div');
		edge.className = 'edge';
		edge.style.width = '1mm';
		edge.style.height = this.shelf.height +'mm';
		edge.style.bottom = 0;
		this.shelfDiv.appendChild (edge);
		return edge;
	}

	,drawBox: function (allocator, item, amount)
	{
		if (item.boxWidth == 0 || item.boxHeight == 0)
			return;

		var shelf = this.shelf;

		var x = allocator.trayX + shelf.hspacing;
		var y = allocator.trayY
			+ shelf.firstTrayElevation + shelf.trayDensity
			+ allocator.currentTray * (shelf.trayHeight + shelf.trayDensity);

		var box = this.doc.createElement ('div');
		box.className = 'box';
		this.shelfDiv.appendChild (box);
		
		box.style.left = x +'mm';
		box.style.bottom = y +'mm';
		box.style.width = item.boxWidth +'mm';
		box.style.height = item.boxHeight +'mm';
	
		if (amount == 0)
			this.nItem++;

		var nColor = this.nItem % this.nColors;
		Vn.Node.addClass (box, 'color'+ nColor);

		if (amount == 0 || allocator.firstShelfBox)
		{
			var boxLabel = this.doc.createElement ('span');
			box.appendChild (boxLabel);
			
			var text = this.doc.createTextNode (item.name);
			boxLabel.appendChild (text);
		}
	}
});

Vn.Allocator = new Class
({
	addShelf: function ()
	{
		this.currentShelf++;
		this.firstShelfBox = true;
	
		if (this.shelfFunc)
			this.shelfFunc (this);
	}

	,addTray: function ()
	{
		if (this.currentTray <= 0)
		{
			this.addShelf ();
			this.currentTray = this.nTrays - 1;
		}
		else
			this.currentTray--;
		
		this.trayX = 0;
	}

	,addColumn: function (width)
	{
		if (this.trayX + this.columnWidth + width > this.trayWidth
		|| this.currentTray == -1)
			this.addTray ();
		else
			this.trayX += this.columnWidth;

		this.trayY = 0;
		this.columnWidth = width;
		this.lastBoxWidth = width;
	}

	,addBox: function (item, amount)
	{
		var trayHeight = this.trayHeight;
	
		if (this.currentTray == this.nTrays - 1)
			trayHeight = this.topTrayHeight;

		if (this.trayY + item.boxHeight > trayHeight
		|| item.boxWidth > this.lastBoxWidth)
			this.addColumn (item.boxWidth);

		if (this.boxFunc)
			this.boxFunc (this, item, amount);

		this.trayY += item.boxHeight;
	
		if (item.boxWidth < this.lastBoxWidth)
			this.lastBoxWidth = item.boxWidth;
	}

	,run: function ()
	{
		this.firstShelfBox = false;
		this.currentShelf = -1;
		this.currentTray = -1;
		this.columnWidth = 0;
		this.lastBoxWidth = 0;
		this.trayX = 0;
		this.trayY = 0;

		for (var i = 0; i < this.items.length; i++)
		{
			var item = this.items[i];
		
			for (var amount = 0; amount < item.amount; amount++)
			{
				if (amount == 0
				&& this.maxAmount > 0
				&& item.amount > this.maxAmount)
					break;

				this.addBox (item, amount);
				this.firstShelfBox = false;
			}
		}
	
		return this.currentShelf + 1;
	}
	
});