rednet.open("left")
rednet.send(12,"MineBot now operating")
while true do
  id,message = rednet.receive()
  if id == 7 then
    if message == "mine" then
          H = 0
          rednet.send(12,"Mining...")
          repeat
            turtle.digDown()
            turtle.down()
            turtle.dig()
            turtle.forward()
            H = H + 1
            if turtle.getFuelLevel() == 0 then
                  turtle.refuel()
                  local x, y, z = gps.locate(5)
                  if not x then
                    rednet.send(12,"Could not find location")
                  else
                    rednet.send(12,"MineBot Location: " .. x .. "," .. y .. "," .. z .. " ")
                  end
            end
          until H == 50
    end
    if message == "return" then
          rednet.send(12, "Returning to surface")
          turtle.turnRight()
          turtle.turnRight()
          H = 50
          repeat
            turtle.up()
            sleep(0.1)
            turtle.forward()
            sleep(0.1)
            H = H - 1
          until H == 0
          if H == 0 then
            turtle.turnRight()
            turtle.turnRight()
          end
    end
    if message == "180" then
          turtle.turnRight()
          turtle.turnRight()
    end
    if message == "forward" or message == "f" then
          turtle.forward()
    end
    if message == "back" or message == "b" then
          turtle.back()
    end
    if message == "up" then
          turtle.up()
    elseif message =="up1" then
          turtle.up()
          turtle.forward()
    end
    if message == "down" then
          turtle.down()
    elseif message == "down1" then
          turtle.down()
          turtle.forward()
    end
    if message == "left" then
          turtle.turnLeft()
    end
    if message == "right" then
          turtle.turnRight()
    end
    if message == "reboot" then
          rednet.send(12,"Restarting turtle...")
          sleep(2)
          os.reboot()
    end
    if message == "gps" then
          local x, y, z = gps.locate(5)
          if not x then
            rednet.send(12,"Could not find location")
          else
            rednet.send(12,"Current location: ".. x .. "," .. y .. "," .. z .. " ")
          end
    end
    if message == "off" then
          rednet.send(12,"Powering off...")
          sleep(1)
          rednet.send(12,"System is offline.")
          os.shutdown()
    end
    if message == "save" then
          rednet.send(12,"Writing to disk...")
          sleep(2)
          if disk.isPresent("right") then
            if disk.hasData("right") then
                  disk.setLabel("right","MineOS 1.0.0")
                  shell.run("cp","startup","disk/MineOS1.0")
                  rednet.send(12,"Success!")
                  sleep(2)
                  rednet.send(12,"Ejecting floppy disk...")
                  disk.eject("right")
            else
                  rednet.send(12,"No floppy disk found")
            end
          elseif disk.isPresent("left") then
  if disk.hasData("left") then
                  disk.setLabel("left","MineOS 1.0.0")
                  shell.run("cp","startup","disk/MineOS1.0")
                  rednet.send(12,"Success!")
                  sleep(2)
                  rednet.send(12,"Ejecting floppy disk...")
                  disk.eject("left")
            else
                  rednet.send(12,"No floppy disk found")
            end
          elseif disk.isPresent("back") then
  if disk.hasData("back") then
                  disk.setLabel("back","MineOS 1.0.0")
                  shell.run("cp","startup","disk/MineOS1.0")
                  rednet.send(12,"Success!")
                  sleep(2)
                  rednet.send(12,"Ejecting floppy disk...")
                  disk.eject("back")
            else
                  rednet.send(12,"No floppy disk found")
            end
          elseif disk.isPresent("front") then
  if disk.hasData("front") then
                  disk.setLabel("front","MineOS 1.0.0")
                  shell.run("cp","startup","disk/MineOS1.0")
                  rednet.send(12,"Success!")
                  sleep(2)
                  rednet.send(12,"Ejecting floppy disk...")
                  disk.eject("front")
            else
                  rednet.send(12,"No floppy disk found")
            end
          elseif disk.isPresent("top") then
  if disk.hasData("top") then
                  disk.setLabel("top","MineOS 1.0.0")
                  shell.run("cp","startup","disk/MineOS1.0")
                  rednet.send(12,"Success!")
                  sleep(2)
                  rednet.send(12,"Ejecting floppy disk...")
                  disk.eject("top")
            else
                  rednet.send(12,"No floppy disk found")
            end
          elseif disk.isPresent("bottom") then
  if disk.hasData("bottom") then
                  disk.setLabel("bottom","MineOS 1.0.0")
                  shell.run("cp","startup","disk/MineOS1.0")
                  rednet.send(12,"Success!")
                  sleep(2)
                  rednet.send(12,"Ejecting floppy disk...")
                  disk.eject("bottom")
            else
                  rednet.send(12,"No floppy disk found")
            end
   else
            rednet.send(12,"No disk drive present")
          end
    end
    if message == "fuel" then
          local fuel = turtle.getFuelLevel()
          rednet.send(12,"Fuel remaining: "..fuel.." blocks")
    end
  end
end