-- Power Monitor for induction matrix
--
-- Written and copyrighted 2016+
-- by Sven Marc 'cybrox' Gehring
-- Licensed under MIT license




-- Printing right aligned text on a line
-- This is used for printing our dynamic
-- values to the screen properly
--
-- @param line The line to print on
-- @param text The text to print there
-- @param color The color to print in
-- @return void
function putValue (line, text, color)
  local align = 30 - string.len(text)
  term.setCursorPos(align, line)
  term.setTextColor(color)
  print(text)
end


-- Get a number in a human readable format
-- This is used to display numbers on screen
--
-- @param number The number to format
-- @return The formatted number
function putNumber (number)
  local round = 0
  local texts = ""

  if number >= 1000000000000000000 then
    round = (number / 1000000000000000000)
    texts = string.sub(round, 0, 5) .. " ERF"
  else
    if number >= 1000000000000000 then
      round = (number / 1000000000000000)
      texts = string.sub(round, 0, 5) .. " PRF"
    else
      if number >= 1000000000000 then
        round = (number / 1000000000000)
        texts = string.sub(round, 0, 5) .. " TRF"
      else
        if number >= 1000000000 then
          round = (number / 1000000000)
          texts = string.sub(round, 0, 5) .. " GRF"
        else
          if number >= 1000000 then
            round = (number / 1000000)
            texts = string.sub(round, 0, 5) .. " MRF"
          else
            if number >= 1000 then
              round = (number / 1000)
              texts = string.sub(round, 0, 5) .. " kRF"
            else
              texts = string.sub(number, 0, 5) .. "  RF"
            end
          end
        end
      end
    end
  end

  return texts
end




-- Initialize our interface!
-- Find all of our peripherals
monitor = peripheral.find("monitor")
battery = peripheral.find("mekanismMachine")

-- Check and bind monitor
if monitor == nil then
  error("ER: No screen found to display!")
else
  monitor.clear()
  term.redirect(monitor)
  term.setCursorPos(1, 1)
  term.setBackgroundColor(colors.black)
end

-- Check if we have a battery
if battery == nil then
  error("ER: No battery connected to computer")
end

-- Draw our static fill volume box
term.setTextColor(colors.white)
term.setCursorPos(2, 2)
print("+------+")
term.setCursorPos(2, 11)
print("+------+")
for i = 3, 10 do
  term.setCursorPos(2, i)
  print("|")
  term.setCursorPos(9, i)
  print("|")
end

-- Draw our static interface text
term.setCursorPos(11, 2);
print("Max RF:")
term.setCursorPos(11, 3);
print("Max Thru:")

term.setCursorPos(11, 5);
print("Cur In:")
term.setCursorPos(11, 6);
print("Cur Out:")
term.setCursorPos(11, 7);
print("Cur Bal:")

term.setCursorPos(11, 9);
print("Stored:")
term.setCursorPos(11, 10);
print("Filled:")
term.setCursorPos(11, 11);
print("Critical:")


-- Entering our infinite loop of checking the battery
-- This will refresh all information every 2 seconds
alarmIsRinging = false
alarmIsActive = false
alarmCounter = 0

while true do

  -- Get our fixed battery values
  batteryMaxCharge = battery.getCapacity()
  putValue(2, putNumber(batteryMaxCharge), colors.lightBlue)

  -- Get our input/output/balance battery values
  batteryCurrentIn = battery.getTransferRate()
  batteryCurrentOut = battery.getTransferRate()
  putValue(5, putNumber(batteryCurrentIn), colors.lightBlue)
  putValue(6, putNumber(batteryCurrentOut), colors.lightBlue)

  batteryCurrentBalance = batteryCurrentIn - batteryCurrentOut
  batteryCurrentColor = (batteryCurrentBalance >= 0) and colors.green or colors.red
  batteryCurrentSign = (batteryCurrentBalance >= 0) and "+" or ""
  putValue(7, batteryCurrentSign .. putNumber(batteryCurrentBalance), batteryCurrentColor)

  -- Get our statistical values
  batteryCurrentCharge = battery.getStoredEnergy()
  putValue(9, putNumber(batteryCurrentCharge), colors.lightBlue)

  batteryCurrentColor = colors.red
  batteryCurrentPercentage = ((batteryCurrentCharge / batteryMaxCharge) * 100)
  if batteryCurrentPercentage > 30 then batteryCurrentColor = colors.orange end
  if batteryCurrentPercentage > 60 then batteryCurrentColor = colors.green end
  putValue(10, string.sub(putNumber(batteryCurrentPercentage), 0, 4) .. "%", batteryCurrentColor)

  batteryCurrentCritical = "Yes"
  batteryCurrentColor = colors.red
  if batteryCurrentPercentage > 15 then
    batteryCurrentCritical = "No"
    batteryCurrentColor = colors.green
  end
  putValue(11, batteryCurrentCritical, batteryCurrentColor)

  -- Draw the current charge graph
  batteryCurrentColor = colors.red
  if batteryCurrentPercentage > 30 then term.setTextColor(colors.orange) end
  if batteryCurrentPercentage > 60 then term.setTextColor(colors.green) end
  if batteryCurrentPercentage >= 100 then term.setTextColor(colors.lightBlue) end

  for i = 3, 10 do
    term.setCursorPos(3, i)
    print("      ")
  end

  iterator = 0
  for i = 3, 10 do
    local compare = (12.5 * iterator)
    if (batteryCurrentPercentage >= compare) then
      term.setCursorPos(3, (13 - i))
      local filler = ""
      for i = 1, 6 do
        local inhere = (compare + (i*2))
        if batteryCurrentPercentage >= inhere then
          filler = filler .. "#"
        else
          if batteryCurrentPercentage >= (inhere - 1) then
            filler = filler .. "="
          else
            filler = filler .. "_"
          end
        end
      end
      print(filler)
    end

    iterator = iterator + 1
  end

  -- Hey, ring the alarm!
  if batteryCurrentPercentage > 10 then
    alarmIsRinging = false
    alarmIsActive = false
  end

  if batteryCurrentPercentage < 10 and alarmIsActive == false then
    alarmIsRinging = true
    alarmIsActive = true
    alarmCounter = 0
    redstone.setOutput("left", true)
  end

  if alarmIsRinging == true then
    alarmCounter = alarmCounter + 1
    if alarmCounter >= 10 then
      redstone.setOutput("left", false)
      alarmIsRinging = false
    end
  end

  -- Wait 2s until next iteration
  os.sleep(2)

end