-- The identifier of this program is vHc0EfGD
-- This program implements the flying quarry mining turtles

-- This is the variable declaration section of the program

quarryLength = 11 quarryWidth = quarryLength quarryDepth = 3
xStart = -696 zStart = -3484 yStart = 50 orientationStart = 4
chestX = -701 chestZ = -3484 chestY = 89 chestOrientation = 3
progressX =0 progressZ = 0 progressY = 0 progressOrientation = 0
xCoord = chestX  -- East and west coordinates
zCoord = chestZ  -- North and south coordinates
yCoord = chestY  -- Vertical coordinates
orientation = chestOrientation
directions = {"north", "east", "south", "west"} -- Directions indexed as 1 to 4
xDiff = {0, 1, 0, -1}
zDiff = {-1, 0, 1, 0}

-- This is the function declaration section of the program

local function tryDig() -- This function digs forward one block
    while turtle.detect() do
        if turtle.dig() then
            sleep(0.5)
        else
            return false
        end
    end
    return true
end

local function tryDigUp() -- This function digs up one block
    while turtle.detectUp() do
        if turtle.digUp() then
            sleep(0.5)
        else
            return false
        end
    end
    return true
end

local function tryDigDown() -- This function digs down one block
    while turtle.detectDown() do
        if turtle.digDown() then
            sleep(0.5)
        else
            return false
        end
    end
    return true
end

function tLeft() -- This function turns the turtle left and updates orientation
   orientation = orientation - 1
   orientation = (orientation - 1) % 4
   orientation = orientation + 1
   turtle.turnLeft()
end

function tRight()  -- This function turns the turtle right and updates orientation
   orientation = orientation - 1
   orientation = (orientation + 1) % 4
   orientation = orientation + 1
   turtle.turnRight()
end
   
function mForward()  -- This function moves the turtle forward and updates coordinates
   local moved = false
   while not(moved) do
      moved = turtle.forward()
	  end
   xCoord = xCoord + xDiff[orientation]
   zCoord = zCoord + zDiff[orientation]
end

function mBack()  -- This function moves the turtle backward and updates coordinates
   local moved = false
   while not(moved) do
      moved = turtle.back()
	  end
   xCoord = xCoord - xDiff[orientation]
   zCoord = zCoord - zDiff[orientation]
end

function mUp()  -- This function moves the turtle upward and updates coordinates
   local moved = false
   while not(moved) do
      moved = turtle.up()
	  end
   yCoord = yCoord + 1
end
   
function mDown()  -- This function moves the turtle downward and updates coordinates
   local moved = false
   while not(moved) do
      moved = turtle.down()
	  end
   yCoord = yCoord - 1
end
   
function look(direction)  -- This function turns the turtle to the desired direction
   while direction ~= directions[orientation] do
      tRight()
	  end
end

function moveTo(xTarget, zTarget, yTarget)
   while yTarget < yCoord do
      mDown()
   end
   while yTarget > yCoord do
      mUp()
   end

   if xTarget < xCoord then
      look("west")
	  while xTarget < xCoord do
	     mForward()
      end
   end
   if xTarget > xCoord then
      look("east")
	  while xTarget > xCoord do
	     mForward()
      end
   end
	  
   if zTarget < zCoord then
      look("north")
	  while zTarget < zCoord do
	     mForward()
      end
   end
   if zTarget > zCoord then
      look("south")
	  while zTarget > zCoord do
	     mForward()
      end
   end
end

function dumpBlocks(continue)
   progressX =xCoord progressZ = zCoord progressY = yCoord progressOrientation = orientation
   moveTo(chestX, chestZ, chestY) look(directions[chestOrientation])
   for i = 1, 16 do
      turtle.select( i )
	  turtle.drop(64)
   end
   turtle.select( 1 )
   if continue == "y" then moveTo(progressX, progressZ, (progressY + 1)) look(directions[progressOrientation])
   mDown()
   else return "true" end
end
   
function cutSquare(size, depth)
   for a = 1, depth do -- Cut the number of squares specified by the depth variable
      for b = 1, size do -- Cut the number of rows specified by the size variable
         for c = 1, size do -- Cut a column of the square
            -- Check if this is the first block of a new square else cut column
            if (b == 1 and c == 1) then tryDigDown() mDown() elseif c > 1 then tryDig() mForward() end
            -- Check if slot #16 has items put into it then dump blocks in chest
            if (c == 5 and turtle.getItemCount(16) > 0) then dumpBlocks("y") end
         end
		if (b < size) then --Position to cut the next column of the square
	        if (b % 2 == 1) then --Position to cut the next column of the square
	           tRight()
			   tryDig()
			   mForward()
		       tRight()
	        else
	           tLeft()
			   tryDig()
			   mForward()
		       tLeft()
	        end
		end
	  end
	  yStart = yStart - 1
      moveTo(xStart, zStart, yStart) look(directions[orientationStart])
--	  if (a < depth) then
--	     tryDigDown()
--	     mDown()
--      end
   end
end

-- This is the main loop section of the program

moveTo(xStart, zStart, yStart) look(directions[orientationStart])
cutSquare(quarryLength, quarryDepth)
dumpBlocks("n")
moveTo(chestX, chestZ, chestY) look(directions[chestOrientation])
yStart = yStart - quarryDepth
print("Fuel level is "..turtle.getFuelLevel())