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--Json Library by ElvishJerrico

------------------------------------------------------------------ utils
local controls = {["\n"]="\\n", ["\r"]="\\r", ["\t"]="\\t", ["\b"]="\\b", ["\f"]="\\f", ["\""]="\\\"", ["\\"]="\\\\"}

local function isArray(t)
	local max = 0
	for k,v in pairs(t) do
		if type(k) ~= "number" then
			return false
		elseif k > max then
			max = k
		end
	end
	return max == #t
end

local whites = {['\n']=true; ['\r']=true; ['\t']=true; [' ']=true; [',']=true; [':']=true}
function removeWhite(str)
	while whites[str:sub(1, 1)] do
		str = str:sub(2)
	end
	return str
end

------------------------------------------------------------------ encoding

local function encodeCommon(val, pretty, tabLevel, tTracking)
	local str = ""

	-- Tabbing util
	local function tab(s)
		str = str .. ("\t"):rep(tabLevel) .. s
	end

	local function arrEncoding(val, bracket, closeBracket, iterator, loopFunc)
		str = str .. bracket
		if pretty then
			str = str .. "\n"
			tabLevel = tabLevel + 1
		end
		for k,v in iterator(val) do
			tab("")
			loopFunc(k,v)
			str = str .. ","
			if pretty then str = str .. "\n" end
		end
		if pretty then
			tabLevel = tabLevel - 1
		end
		if str:sub(-2) == ",\n" then
			str = str:sub(1, -3) .. "\n"
		elseif str:sub(-1) == "," then
			str = str:sub(1, -2)
		end
		tab(closeBracket)
	end

	-- Table encoding
	if type(val) == "table" then
		assert(not tTracking[val], "Cannot encode a table holding itself recursively")
		tTracking[val] = true
		if isArray(val) then
			arrEncoding(val, "[", "]", ipairs, function(k,v)
				str = str .. encodeCommon(v, pretty, tabLevel, tTracking)
			end)
		else
			arrEncoding(val, "{", "}", pairs, function(k,v)
				assert(type(k) == "string", "JSON object keys must be strings", 2)
				str = str .. encodeCommon(k, pretty, tabLevel, tTracking)
				str = str .. (pretty and ": " or ":") .. encodeCommon(v, pretty, tabLevel, tTracking)
			end)
		end
	-- String encoding
	elseif type(val) == "string" then
		str = '"' .. val:gsub("[%c\"\\]", controls) .. '"'
	-- Number encoding
	elseif type(val) == "number" or type(val) == "boolean" then
		str = tostring(val)
	else
		error("JSON only supports arrays, objects, numbers, booleans, and strings", 2)
	end
	return str
end

function encode(val)
	return encodeCommon(val, false, 0, {})
end

function encodePretty(val)
	return encodeCommon(val, true, 0, {})
end

------------------------------------------------------------------ decoding

local decodeControls = {}
for k,v in pairs(controls) do
	decodeControls[v] = k
end

function parseBoolean(str)
	if str:sub(1, 4) == "true" then
		return true, removeWhite(str:sub(5))
	else
		return false, removeWhite(str:sub(6))
	end
end

function parseNull(str)
	return nil, removeWhite(str:sub(5))
end

local numChars = {['e']=true; ['E']=true; ['+']=true; ['-']=true; ['.']=true}
function parseNumber(str)
	local i = 1
	while numChars[str:sub(i, i)] or tonumber(str:sub(i, i)) do
		i = i + 1
	end
	local val = tonumber(str:sub(1, i - 1))
	str = removeWhite(str:sub(i))
	return val, str
end

function parseString(str)
	str = str:sub(2)
	local s = ""
	while str:sub(1,1) ~= "\"" do
		local next = str:sub(1,1)
		str = str:sub(2)
		assert(next ~= "\n", "Unclosed string")

		if next == "\\" then
			local escape = str:sub(1,1)
			str = str:sub(2)

			next = assert(decodeControls[next..escape], "Invalid escape character")
		end

		s = s .. next
	end
	return s, removeWhite(str:sub(2))
end

function parseArray(str)
	str = removeWhite(str:sub(2))

	local val = {}
	local i = 1
	while str:sub(1, 1) ~= "]" do
		local v = nil
		v, str = parseValue(str)
		val[i] = v
		i = i + 1
		str = removeWhite(str)
	end
	str = removeWhite(str:sub(2))
	return val, str
end

function parseObject(str)
	str = removeWhite(str:sub(2))

	local val = {}
	while str:sub(1, 1) ~= "}" do
		local k, v = nil, nil
		k, v, str = parseMember(str)
		val[k] = v
		str = removeWhite(str)
	end
	str = removeWhite(str:sub(2))
	return val, str
end

function parseMember(str)
	local k = nil
	k, str = parseValue(str)
	local val = nil
	val, str = parseValue(str)
	return k, val, str
end

function parseValue(str)
	local fchar = str:sub(1, 1)
	if fchar == "{" then
		return parseObject(str)
	elseif fchar == "[" then
		return parseArray(str)
	elseif tonumber(fchar) ~= nil or numChars[fchar] then
		return parseNumber(str)
	elseif str:sub(1, 4) == "true" or str:sub(1, 5) == "false" then
		return parseBoolean(str)
	elseif fchar == "\"" then
		return parseString(str)
	elseif str:sub(1, 4) == "null" then
		return parseNull(str)
	end
	return nil
end

function decode(str)
	str = removeWhite(str)
	t = parseValue(str)
	return t
end

function decodeFromFile(path)
	local file = assert(fs.open(path, "r"))
	local decoded = decode(file.readAll())
	file.close()
	return decoded
end

--Finding a Peripheral
function findPeripheral(pType)
  local pList = {}
  for _,pName in pairs(peripheral.getNames()) do
    if peripheral.getType(pName) == pType then
      table.insert(pList, peripheral.wrap(pName))
    end
  end
  return unpack(pList)
end
peripheral.find = findPeripheral

--Start of program
oBridge = peripheral.find("openperipheral_glassesbridge")
oSensor = peripheral.find("openperipheral_sensor")

function fGetPlayers()
  local sData = http.get("http://tekkit.craftersland.net:25800/up/world/world/").readAll()
  sData = string.gsub(sData, "\\", "\\\\")
  local tData = decode(sData)
  return tData["players"]
end

tRendered = {}
function fRenderTable()
  tRendered = {}
  local tPlayers = fGetPlayers()
  for i = 1,#tPlayers do
    tSensorData = oSensor.getPlayerData(tPlayers[i]["name"])
    tPlayers[i]["world"] = "?"
    if tSensorData then
      tPlayers[i].x = math.floor(4005+tSensorData.position.x)
      tPlayers[i].y = math.floor(67+tSensorData.position.y)
      tPlayers[i].z = math.floor(3771+tSensorData.position.z)
      tPlayers[i].world = "world"
    end
    sRender = ""
    sName = tPlayers[i]["name"]
    for si = #tPlayers[i]["name"],17 do
      sName = sName .. " "
    end
    sRender = sRender .. sName
    sX = tostring(tPlayers[i]["x"])
    if not string.find(sX, "-") then
      sX = " " .. sX
    end
    for si = #sX,6 do
      sX = sX .. " "
    end
    sRender = sRender .. sX
    sY = tostring(tPlayers[i]["y"])
    if not string.find(sY, "-") then
      sY = " " .. sY
    end
    for si = #sY,4 do
      sY = sY .. " "
    end
    sRender = sRender .. sY
    sZ = tostring(tPlayers[i]["z"])
    if not string.find(sZ, "-") then
      sZ = " " .. sZ
    end
    for si = #sZ,6 do
      sZ = sZ .. " "
    end
    sRender = sRender .. sZ
    sWorld = tPlayers[i]["world"]
    for si = #tPlayers[i]["world"],6 do
      sWorld = sWorld .. " "
    end
    sRender = sRender .. sWorld
    tRendered[tPlayers[i]["name"]] = {}
    tRendered[tPlayers[i]["name"]]["render"] = sRender
    tRendered[tPlayers[i]["name"]]["name"] = tPlayers[i].name
    tRendered[tPlayers[i]["name"]]["sx"] = sX
    tRendered[tPlayers[i]["name"]]["sy"] = sY
    tRendered[tPlayers[i]["name"]]["sz"] = sZ
    tRendered[tPlayers[i]["name"]]["x"] = tPlayers[i].x
    tRendered[tPlayers[i]["name"]]["y"] = tPlayers[i].y
    tRendered[tPlayers[i]["name"]]["z"] = tPlayers[i].z
    tRendered[tPlayers[i]["name"]]["world"] = tPlayers[i].world
  end
  --[[for _,tRender in pairs(tRendered) do
    print(tRender["render"])
  end]]--
end

function fDirectionOld(x1,y1,x2,y2)
  nRad = math.atan2(y2-y1,x2-x1)
  if nRad < 0 then
    nRad = nRad + (2*math.pi)
  end
  nDeg = nRad * (180/math.pi)
  if nDeg == 0 then
    return "E"
  elseif nDeg == 45 then
    return "NE"
  elseif nDeg == 90 then
    return "N"
  elseif nDeg == 135 then
    return "NW"
  elseif nDeg == 180 then
    return "W"
  elseif nDeg == 225 then
    return "SW"
  elseif nDeg == 270 then
    return "S"
  elseif nDeg == 315 then
    return "SE"
  else
    return "?"
  end
end

function fDirection(nX1, nZ1, nX2, nZ2)
  local dir = math.atan2(nZ2 - nZ1, nX2 - nX1)
  if dir > 2.75 or dir < -2.74 then
    return "W"
  elseif dir > -2.75 and dir < -1.95 then
    return "NW"
  elseif dir > -1.96 and dir < -1.17 then
    return "N"
  elseif dir > -1.18 and dir < -0.38 then
    return "NE"
  elseif dir > -0.39 and dir < 0.40 then
    return "E"
  elseif dir > 0.39 and dir < 1.19 then
    return "SE"
  elseif dir > 1.18 and dir < 1.96 then
    return "S"
  elseif dir > 1.96 and dir < 2.76 then
    return "SW"
  end
end

function fDistance(nX1, nY1, nX2, nY2)
  return math.floor(math.sqrt(math.pow(nX2-nX1,2)+math.pow(nY2-nY1,2)))
end

tModuleLocs = {
  ["tracker"] = {7,7},
}

while true do
  fRenderTable()
  tUsers = oBridge.getUsers()
  for i = 1,#tUsers do
    if tUsers[i] == "Fisher" or tUsers[i] == "RewVenN" then
      tSurface = oBridge.getUserSurface(tUsers[i])
      tSurface.clear()
      nIterator = 1
      for _,tRender in pairs(tRendered) do
        nIterator = nIterator + 1
      end
      nGradientWidth = 265
      if tRendered[tUsers[i]] ~= nil then
        nGradientWidth = 330
      end
      tSurface.addGradientBox(tModuleLocs["tracker"][1],tModuleLocs["tracker"][2],tModuleLocs["tracker"][1]+nGradientWidth,tModuleLocs["tracker"][2]+(nIterator*10)-10,0x000000,0.7,0x404040,0.7,1)
      nIterator = 1
      for _,tRender in pairs(tRendered) do
        nColor = 0xFFFFFF
        if nIterator % 2 == 0 then
          nColor = 0xFFFFFF
        else
          nColor = 0xC0C0C0
        end
        tSurface.addText(tModuleLocs["tracker"][1]+4,tModuleLocs["tracker"][2]+(nIterator*10)-6,tRender["name"],nColor)
        tSurface.addText(tModuleLocs["tracker"][1]+110+4,tModuleLocs["tracker"][2]+(nIterator*10)-6,tostring(tRender["sx"]),nColor)
        tSurface.addText(tModuleLocs["tracker"][1]+150+4,tModuleLocs["tracker"][2]+(nIterator*10)-6,tostring(tRender["sy"]),nColor)
        tSurface.addText(tModuleLocs["tracker"][1]+190+4,tModuleLocs["tracker"][2]+(nIterator*10)-6,tostring(tRender["sz"]),nColor)
        tSurface.addText(tModuleLocs["tracker"][1]+230+4,tModuleLocs["tracker"][2]+(nIterator*10)-6,tRender["world"],nColor)
        if tRendered[tUsers[i]] ~= nil then
          if tRender["name"] == tUsers[i] then
            tSurface.addText(tModuleLocs["tracker"][1]+270+4,tModuleLocs["tracker"][2]+(nIterator*10)-6,"-",nColor)
          else
            tSurface.addText(tModuleLocs["tracker"][1]+270+4,tModuleLocs["tracker"][2]+(nIterator*10)-6,fDirection(tonumber(tRendered[tUsers[i]]["x"]),tonumber(tRendered[tUsers[i]]["z"]),tonumber(tRender["x"]),tonumber(tRender["z"])),nColor)
          end
          if tRender["name"] == tUsers[i] then
            tSurface.addText(tModuleLocs["tracker"][1]+290+4,tModuleLocs["tracker"][2]+(nIterator*10)-6,"-",nColor)
          else
            if tRender["world"] ~= "?" then
              tSurface.addText(tModuleLocs["tracker"][1]+290+4,tModuleLocs["tracker"][2]+(nIterator*10)-6,fDistance(tonumber(tRendered[tUsers[i]]["x"]),tonumber(tRendered[tUsers[i]]["z"]),tonumber(tRender["x"]),tonumber(tRender["z"])).."m",nColor)
            else
              tSurface.addText(tModuleLocs["tracker"][1]+290+4,tModuleLocs["tracker"][2]+(nIterator*10)-6,"?m",nColor)
            end
          end
        end
        nIterator = nIterator + 1
      end
    end
  end
  os.startTimer(0.25)
  tEvent = {os.pullEvent()}
  if tEvent[1] == "chat_command" then
    print("$$" .. tEvent[2])
    tCmdArgs = {}
    for sArg in string.gmatch(tEvent[2],"%S+") do
       table.insert(tCmdArgs, sArg)
    end
    if tCmdArgs[1] == "move" then
      if tModuleLocs[tCmdArgs[2]] ~= nil then
        if tonumber(tCmdArgs[3]) and tonumber(tCmdArgs[4]) then
          tModuleLocs[tCmdArgs[2]][1] = tonumber(tCmdArgs[3])
          tModuleLocs[tCmdArgs[2]][2] = tonumber(tCmdArgs[4])
        end
      end
    end
  end
end

print(fDirection(0,10,0,0))
--print(#fGetPlayers())