Grid.coffee

tileCounts = 
	A: 9, B: 2, C: 2, D: 4, E: 12, F: 2, G: 3, H: 2, I: 9, J: 1, K: 1, L: 4 
	M: 2, N: 6, O: 8, P: 2, Q: 1, R: 6, S: 4, T: 6, U: 4, V: 2, W: 2, X: 1 
	Y: 2, Z: 1
totalTiles = 0 
totalTiles += count for letter, count of tileCounts
alphabet = (letter for letter of tileCounts).sort()

randomLetter = -> 
	randomNumber = Math.ceil Math.random() * totalTiles 
	x = 1 
	for letter in alphabet
		x += tileCounts[letter] 
		return letter if x > randomNumber

class Grid
	constructor: ->
		@size = size = 5
		@tiles = for x in [0...size]
			for y in [0...size]
				randomLetter()

	inRange: (x, y) -> 
		0 <= x < @size and 0 <= y < @size

	swap: ({x1, y1, x2, y2}) -> 
		[@tiles[x1][y1], @tiles[x2][y2]] = [@tiles[x2][y2], @tiles[x1][y1]]

root = exports ? window
root.Grid = Grid