local bigfont = require("bigfont")

local gfx = {}

function gfx.drawHeader(t, text)
  t.setTextColour(colours.white)
  bigfont.writeOn(t, 1, text, nil, 2)
end

function gfx.drawFooter(t, text)
  local w, h = t.getSize()
  t.setTextColour(colours.grey)
  gfx.writeCentred(t, w, text, h)
end

function gfx.writeCentred(t, w, text, y)
  t.setCursorPos(math.ceil((w - #text) / 2), y)
  t.write(text)
end

function gfx.colourToBlit(col)
  return string.format("%x", math.log(col, 2))
end

function gfx.drawLoading(t)
  local w, h = t.getSize()

  local centerY = math.ceil(h / 2)
  t.setTextColour(colours.lightGrey)
  gfx.writeCentred(t, w, "Loading...", centerY)

  return centerY
end

function gfx.clearLoading(t, centerY)
  t.setCursorPos(1, centerY)
  t.clearLine(0)
end

function gfx.drawBox(t, x, y, w, h)
  t.setTextColour(colours.grey)
  t.setCursorPos(x, y)
  t.write("\156" .. ("\140"):rep(w - 2) .. "\148")

  for i = y + 1, y + h - 1 do
    t.setCursorPos(x, i)
    t.write("\149" .. (" "):rep(w - 2) .. "\149")
  end

  t.setCursorPos(x, y + h)
  t.write(("\131"):rep(w - 1) .. "\129")
end

return gfx