-- ================
-- Private helpers
-- ================
local setmetatable = setmetatable

-- Internal class constructor
local class = function(...)
  local klass = {}
  klass.__index = klass
  klass.__call = function(_,...) return klass:new(...) end
  function klass:new(...)
    local instance = setmetatable({}, klass)
    klass.__init(instance, ...)
    return instance
  end
  return setmetatable(klass,{__call = klass.__call})
end

local Map = class()
Map.__tostring = function(m) return ('Map %dx%d'):format(m.width, m.height) end

function Map:__init(w, h)
	self.width, self.height = w, h
	self.tiles = {}
	for y=0,h-1 do
		self.tiles[y] = {}
		for x=0,w-1 do
			self.tiles[y][x] = 1
		end
	end
end

function Map:print()
	for y=0,self.height-1 do
		line = ''
		for x=0,self.width-1 do
			if self.tiles[y][x] == 1 then
				line = line..'#'
			elseif self.tiles[y][x] == 2 then
				line = line..'.'
			else
				line = line..' '
			end 
		end
		print(line)
	end
end

function Map:carve(room) 
	local rx, ry = math.floor(room.x), math.floor(room.y)
	if rx <= 0 or ry <= 0 or rx >= self.width-room.width-1 or ry >= self.height-room.height-1 then return end
	self.tiles[ry][rx] = 2

	for y=ry, ry+room.height-1 do
		for x=rx, rx+room.width-1 do
			self.tiles[y][x] = 0
		end
	end
end

function Map:toArray()
	local a = {}
	for y=0,self.height do
		for x=0,self.width do
			table.insert(a, self.tiles[y][x])
		end
	end
	return a
end

return Map