feat(mystical-upgrader): replace first picked item by the correct block

mystical-upgrader.lua

@@ -105,7 +105,7 @@ local inspectBlockName = function()
   return block and block.name
 end
 
-local selectBlock = function(itemName)
+local selectItem = function(itemName)
   for i=1, 16, 1 do
     local details = turtle.getItemDetail(i)
     if details and details.name == itemName then
@@ -124,7 +124,7 @@ local replaceBlockAt = function(y)
     return false
   end
 
-  local selected = selectBlock(blockName)
+  local selected = selectItem(blockName)
 
   if not selected then
     return 'error'
@@ -136,10 +136,18 @@ local replaceBlockAt = function(y)
 end
 
 local placeDownFillBlock = function()
-  selectBlock(FILL_BLOCK)
+  selectItem(FILL_BLOCK)
   turtle.placeDown()
 end
 
+local placeDownItem = function(itemName)
+  if selectItem(itemName) then
+    turtle.placeDown()
+  else
+    placeDownFillBlock()
+  end
+end
+
 -- Main state and stateful methods
 local function getInitialState()
   return {
@@ -164,6 +172,15 @@ local goUp = function(state)
   state.y = state.y - 1
 end
 
+local function tryToSelectEmptySlot()
+  if not turtleUtils.selectFirstEmptySlot() then
+    turtleUtils.compactInventory()
+    if not turtleUtils.selectFirstEmptySlot() then
+      error('Fatal error: turtle inventory is full', 0)
+    end
+  end
+end
+
 -- 1. down procedure
 local downProcedure = function(state)
   while state.y < 60 do
@@ -183,15 +200,32 @@ local downProcedure = function(state)
       break
     end
 
-    digAndGoDown(state)
+    if not state.firstPickedItem then
+      tryToSelectEmptySlot()
+      digAndGoDown(state)
+
+      local item = turtle.getItemDetail(turtle.getSelectedSlot())
+      -- consider FILL_BLOCK if no block was picked
+      state.firstPickedItem = (item and item.name) or FILL_BLOCK
+    else
+      digAndGoDown(state)
+    end
+
   end
 end
 
 -- 2. up procedure
 local upProcedure = function(state)
-  while state.y ~= 1 do
+  local firstY = getInitialState().y
+
+  while state.y ~= firstY do
     goUp(state)
-    placeDownFillBlock()
+
+    if state.y == firstY + 1 and state.firstPickedItem then
+      placeDownItem(state.firstPickedItem)
+    else
+      placeDownFillBlock()
+    end
   end
 end