os.loadAPI('json')

--test reading nad writing the buildzones grid to a file
--creates a grid of absolute references (0,0) (1,0)
function buildGrid(w,h)
	local grid = {}
	for z=0,h-1 do
		for x=0,w-1 do
			table.insert(grid,{x=x,z=z,played=false})
		end
	end
	return grid
end

-- see if the file exists
function file_exists(file)
  local f = fs.open(file, "rb")
  if f then f:close() end
  return f ~= nil
end


local LOCS = buildGrid(11,27)

fs.makeDir("/records")
local filename = "/records/_buildzones-list.yaml"

local file = fs.open(filename,"w")
file.write(json.encodePretty(LOCS))
file.close()

local id = 10

local newLOCS = json.decodeFromFile(filename)
print(#newLOCS)
print(newLOCS[id].x)
print(newLOCS[id].z)
print(newLOCS[id].played)

newLOCS[id].played = true

local file = fs.open(filename,"w")
file.write(json.encodePretty(newLOCS))
file.close()

local changedLOCS = json.decodeFromFile(filename)
print(#changedLOCS)
print(changedLOCS[id].x)
print(changedLOCS[id].z)
print(changedLOCS[id].played)

print(file_exists(filename))