/replaceBlocks

--File: /replaceBlocks

dofile("/cattech/common.lua")
dofile("/cattech/file.lua")

continueIfNoMatch = false

function selectItemFromInventory(itemName)
    for slot = 1, 16 do
        turtle.select(slot)
        local item = turtle.getItemDetail()  -- No argument, checks the current slot
        print("Sel S" .. slot .. " - " .. item.name)
        if item and item.name == itemName then
            return true
        end
    end
    return false
end

function getReplacementBlock()
    local success

    success = false;

    for slot = 1, 16 do
        turtle.select(slot)
        local item = turtle.getItemDetail()
        print("RB S" .. slot .. " - " .. item.name)
        if item and not turtle.refuel(0) then
            return item.name
        end
    end
    return nil
end

function getTargetBlock(direction)
    local success, block

    if direction == "down" then
        success, block = turtle.inspectDown()
    elseif direction == "up" then
        success, block = turtle.inspectUp()
    elseif direction == "right" then
        turtle.turnRight()
        success, block = turtle.inspect()
        turtle.turnLeft() -- Reset orientation
    elseif direction == "left" then
        turtle.turnLeft()
        success, block = turtle.inspect()
        turtle.turnRight() -- Reset orientation
    else
        print("Invalid direction: " .. tostring(direction))
        return nil
    end

    if success then
        return block.name
    end
    return nil
end


-- Function to replace a block in a given direction
function replaceBlock(direction, replaceThis , replaceWith)
    local returnSuccess, block

    returnSuccess = false

    if direction == "right" then
        turtle.turnRight()
        success, block = turtle.inspect()

        if block.name == replaceWith then
            return true
        end

        if success and block.name == replaceThis then
            turtle.dig()
            if selectItemFromInventory(replaceWith) then
                returnSuccess = turtle.place()
            else
                print("No more replacement blocks available!")
            end
        else
            returnSuccess = continueIfNoMatch
        end
        turtle.turnLeft() -- Reset orientation
    end

    if direction == "left" then
        turtle.turnLeft()
        success, block = turtle.inspect()

        if block.name == replaceWith then
            return true
        end

        if success and block.name == replaceThis then
            turtle.dig()
            if selectItemFromInventory(replaceWith) then
                returnSuccess = turtle.place()
            else
                print("No more replacement blocks available!")
            end
        else
            returnSuccess = continueIfNoMatch
        end
        turtle.turnRight() -- Reset orientation
    end

    if direction == "down" then
        success, block = turtle.inspectDown()

        if block.name == replaceWith then
            return true
        end

        if success and block.name == replaceThis then
            turtle.digDown()
            if selectItemFromInventory(replaceWith) then
                returnSuccess = turtle.placeDown()
            else
                print("No more replacement blocks available!")
            end
        else
            returnSuccess = continueIfNoMatch
        end
    end

    if direction == "up" then
        success, block = turtle.inspectUp()

        if block.name == replaceWith then
            return true
        end

        if success and block.name == replaceThis then
            turtle.digUp()
            if selectItemFromInventory(replaceWith) then
                returnSuccess = turtle.placeUp()
            else
                print("No more replacement blocks available!")
            end
        else
            returnSuccess = continueIfNoMatch
        end
    end

    return returnSuccess
end

config = loadConfigAndDefaults()

if #arg >= 1 then
    config["replaceDirection"] = arg[1]
end

local replaceWith = getReplacementBlock() -- Find a block to replace with
local replaceThis = getTargetBlock(config["replaceDirection"])

while replaceThis == replaceWith do
    refuelIfNeeded(30)

    if not turtle.forward() then
        print("Obstacle ahead, stopping.")
        break
    end
    replaceThis = getTargetBlock(config["replaceDirection"])
end


if not replaceThis then
    print("No block to replace found below.")
    return
else
    print("Replacing : " .. replaceThis);
end

if not replaceWith then
    print("No replacement blocks in inventory!")
    return
else
    print("Replacing with : " .. replaceWith );
end

while true do
    if not replaceBlock(config["replaceDirection"], replaceThis, replaceWith ) then
        print("Replace failed, stopping")
        break
    end

    refuelIfNeeded(30)

    if not turtle.forward() then
        print("Obstacle ahead, stopping.")
        break
    end
end