How we handle setting, getting and swapping lines!

toolbar_and_shovel.p8

elseif state == "tools" then

		-- pressing left will only move you to first item
		if btnp(0) then toolbar.cursor = max(0, toolbar.cursor-1) end
		-- pressing right will only mvoe to the last item
		if btnp(1) then toolbar.cursor = min(12, toolbar.cursor+1) end
		-- if we are on tools I want to have a float-in menu
		-- that comes in from the bottom, showcasing the tools
		toolbar.y = lerp(toolbar.y, toolbar.yOnScreen, 0.2)
		-- go back to planning phase
		if btnp(5) then
			state = "plan"
		end
		-- go to use item phase
		if btnp(4) then
			if toolbar.cursor == 0 then
				state = "shovel"
				shovelState.selected = {}
				shovelState.selectedLines = {}
				shovelState.mode = false
			end
		end
	elseif state == "shovel" then
		-- in shovel state we want to be able to 
		-- swap to rows or to columns
		-- up-down left-right to move the whole selector
		-- need one button to exit state
		-- need one button to do the action
		-- somehow we need a button to switch between row or column selection
		-- left and moves the cursor
		-- up switches state, false is row, true is column
		-- btnp(5) -- exit mode
		-- button(4) is selection
		-- we want to select one line, then move cursor, select another
		-- but redo any time either of them
		if btnp(4) then
			-- if we have to selections already swap them	
			-- add selected position to mode
			add(shovelState.selected, shovelState.cursor)
			add(shovelState.selectedLines, get_tile_or_row(shovelState.cursor, shovelState.mode))
			set_tile_or_row({16,16,16,16,16,16,16,16,16,16,16,16}, shovelState.cursor, shovelState.mode)
		end

		if #shovelState.selected == 2 then
			-- do the swapero
			-- i have 0-farm size stored
			local swapLine = shovelState.selectedLines[1]
			-- row is false, column is true, copy
			-- the first selected one into the temp
			-- variable for swapping
			local selectionTwoTiles = shovelState.selectedLines[2]
			-- swap the value of selection2 into selection one
			set_tile_or_row(selectionTwoTiles, shovelState.selected[1], shovelState.mode)
			-- swap the value of the temporay into selection two
			set_tile_or_row(swapLine, shovelState.selected[2], shovelState.mode)
			shovelState.selected = {}
			shovelState.selectedLines = {}
		end

		-- moving the cursor
		if btnp(0) then 
			shovelState.cursor -= 1
			if shovelState.cursor < 0 then shovelState.cursor = 0 end
		end
		if btnp(1) then
			shovelState.cursor += 1
			if shovelState.cursor > farm.size then shovelState.cursor = farm.size end
		end
		-- swap mode
		if btnp(2) then
			if #shovelState.selected > 0 then
				set_tile_or_row(shovelState.selectedLines[1], shovelState.selected[1], shovelState.mode)
			end

			shovelState.mode = not shovelState.mode
			-- reset already done selections
			-- TODO: DON't forget to rest
			shovelState.selected = {}
			shovelState.selectedLines = {}
		end

		if btnp(5) then
			state = "tools"
			shovelState.selected = {}
			shovelState.selectedLines = {}
		end
	end



function set_tile_or_row(_values, _index, _isColumn)
	for i=1,#_values do
		local tileId = 0
		
		if _isColumn then
			-- columns, so we have fixed X variable y
			tileId = mset(farm.topEdge+_index, farm.topEdge+i-1, _values[i])
		else
			-- rows, so we have variable x, but fix y
			tileId = mset(farm.topEdge+i-1, farm.topEdge+_index, _values[i])
		end
	end
end

function get_tile_or_row(_index, _isColumn)
	local fetchedTiles = {}

	for i=farm.topEdge, farm.topEdge + farm.size do
		local tileId = 0
		
		if _isColumn then
			-- columns, so we have fixed X variable y
			tileId = mget(farm.topEdge+_index, i)
		else
			-- rows, so we have variable x, but fix y
			tileId = mget(i, farm.topEdge+_index)
		end
		add(fetchedTiles, tileId)
	end
	return fetchedTiles
end