-- CWCOS and its installer is licensed under the BSD 3-Clause License.
-- Copyright (c) 2014 ClassCoder
-- See the license at http://opensource.org/licenses/BSD-3-Clause.

-- CWCOS Kernel developers:
-- ClassCoder

kernel = {}

-- We need the installer's centering, duh!
-- Various functions with minor indentation modification
-- http://www.computercraft.info/forums2/index.php?/topic/460-how-to-center-text/page__view__findpost__p__2948
function kernel.centerText(text)
  local x,y = term.getSize()
  local x2,y2 = term.getCursorPos()
  term.setCursorPos(math.ceil((x / 2) - (text:len() / 2)), y2)
  write(text)
end
-- http://www.computercraft.info/forums2/index.php?/topic/460-how-to-center-text/page__view__findpost__p__70667
-- Also added yplusminus, I needed to control that
function kernel.centerTextXY(text, yplusminus)
  if yplusminus == nil then
    yplusminus = 0
  end
  local w, h = term.getSize()
  term.setCursorPos(math.floor(w / 2 - text:len() / 2 + .5), math.floor(h / 2 + .5) + yplusminus)
  io.write(text)
end

-- And term clearing...
-- Terminal clearers
function kernel.clearTermWName(fg, bg, msg)
  kernel.colorTerm(fg, bg)
  term.clear()
  kernel.centerTextXY("CWCOS", 0)
  kernel.colorTerm(colors.lightBlue, colors.black)
  kernel.centerTextXY(msg, 1)
  local sizex,sizey = term.getSize()
  term.setCursorPos(1, 1)
  kernel.colorTerm(fg, bg)
end
function kernel.clearTerm()
  term.clear()
  term.setCursorPos(1, 1)
end
function kernel.resetTerm()
  kernel.colorTerm(colors.white, colors.black)
  kernel.clearTerm()
  term.setCursorPos(1, 1)
end
-- Terminal colorer
function kernel.colorTerm(fg, bg)
  term.setTextColor(fg)
  term.setBackgroundColor(bg)
end
function kernel.shutdown()
  kernel.clearTermWName(colors.blue, colors.black, "Shutting down...")
  sleep(.75)
  os.shutdown()
end
function kernel.reboot()
  kernel.clearTermWName(colors.blue, colors.black, "Restarting...")
  sleep(.75)
  os.reboot()
end

toInit = {
  ['kernel'] = kernel,
}

kernel.clearTermWName(colors.blue, colors.black, "Booting...")
print("[KERNEL] Kernel started")
sleep(.5)
os.run(toInit, "/bin/init")
kernel.centerTextXY("Init crash", -1)
kernel.centerTextXY("Collecting data", 0)
kernel.centerTextXY("000%", 1)
sleep(1)
kernel.centerTextXY("025%", 1)
sleep(1)
kernel.centerTextXY("050%", 1)
sleep(1)
kernel.centerTextXY("075%", 1)
sleep(1)
kernel.centerTextXY("100%", 1)
sleep(.5)
os.shutdown()