local c = require("component")
local unicode = require("unicode")
local holo = c.hologram

if not holo then error("This program reqiures holoram projector.") end


local hologram = {}

---------------------------------------

local symbols = {
  empty = {
    {0, 1, 1, 1, 1},
    {0, 0, 0, 0, 0},
    {0, 0, 0, 0, 0},
    {0, 0, 0, 0, 0},
    {0, 0, 0, 0, 0},
    {0, 0, 0, 0, 0},
    {0, 0, 0, 0, 0},
  },
}

local function clear()
  holo.clear()
end

function hologram.drawSymbol(x, y, z, symbol, color)
  for j = 1, #symbol do
    for i = 1, #symbol[j] do
      if symbol[j][i] == 1 then
        holo.set(x + i - 1, y - j + 1, z, color)
      end
    end
  end
end

function hologram.text(x, y, z, text, color)
  local length = unicode.len(text)
  local smeshenie = 0
  for i = 1, length do
    local sym = unicode.sub(text, i, i)
    hologram.drawSymbol(x + smeshenie, y, z, symbols[sym], color)
    smeshenie = smeshenie + 6
  end
end


---------------------------------------

local args = {...}
local scale = tonumber(args[1]) or 1
local height = tonumber(args[2]) or 10

local date

holo.setScale(scale)

while true do
  holo.clear()
  date = os.date("%T")
  hologram.text(1, height, 24, date, 2)
  os.sleep(1)
end

---------------------------------------

return hologram