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-- Minecraft Open Computers String Farm Robot
-- Code by WolpertingerLP.de
-- Have fun :)
 
local robot = require("robot")
local os = require("os")
local component = require("component")
 
local waitTime = 100
 
local maintainSlot = robot.inventorySize()
local nextToolSlot = maintainSlot - 1
local compareSlot = nextToolSlot - 1
local buttonSlot = compareSlot - 1
 
local currentDirection = nil
local searchForButtonDirectionForth = "left"
local searchForButtonDirectionBack = "right"
 
local searchForLeavesDirectionForth = "left"
local searchForLeavesDirectionBack = "right"
 
function updateDirection()
    if currentDirection == nil then 
        currentDirection = "forth"
    elseif currentDirection == "forth" then
        currentDirection = "back"
    elseif currentDirection == "back" then
        currentDirection = "forth"
    end
end
 
function checkDirection()
    updateDirection()
    
    turns = 0
    turnDirection = nil
    
    if currentDirection == "forth" then
        turnDirection = searchForLeavesDirectionForth
    elseif currentDirection == "back" then
        turnDirection = searchForLeavesDirectionBack
    end
    
    robot.select(compareSlot)
    for x = 0, 4 do
        if robot.compare() then
            if turns < 3 then
                if currentDirection == "forth" then
                    if turnDirection == "left" then
                        searchForLeavesDirectionForth = "left"
                    elseif turnDirection == "right" then
                        searchForLeavesDirectionForth = "right"
                    end
                elseif currentDirection == "back" then
                    if turnDirection == "left" then
                        searchForLeavesDirectionBack = "left"
                    elseif turnDirection == "right" then
                        searchForLeavesDirectionBack = "right"
                    end
                end
            else
                if currentDirection == "forth" then
                    if turnDirection == "left" then
                        searchForLeavesDirectionForth = "right"
                        print("Changing search for leaves direction to right")
                    elseif turnDirection == "right" then
                        searchForLeavesDirectionForth = "left"
                        print("Changing search for leaves direction to left")
                    end
                elseif currentDirection == "back" then
                    if turnDirection == "left" then
                        searchForLeavesDirectionBack = "right"
                        print("Changing search for leaves direction to right")
                    elseif turnDirection == "right" then
                        searchForLeavesDirectionBack = "left"
                        print("Changing search for leaves direction to left")
                    end
                end
            end
            robot.select(1)
            return
        else
            turns = turns + 1
            if turnDirection == "left" then
                robot.turnLeft()
            elseif turnDirection == "right" then
                robot.turnRight()
            end
        end     
    end
    print("Could not determine correct direction :(")
end
 
function pressButton()
    robot.select(buttonSlot)
    turns = 0
    turnDirection = nil
    
    if currentDirection == "forth" then
        turnDirection = searchForButtonDirectionForth
    elseif currentDirection == "back" then
        turnDirection = searchForButtonDirectionBack
    end
    
    for x = 0, 4 do
        if robot.compare() then
            if turns < 3 then
                if currentDirection == "forth" then
                    if turnDirection == "left" then
                        searchForButtonDirectionForth = "left"
                    elseif turnDirection == "right" then
                        searchForButtonDirectionForth = "right"
                    end
                elseif currentDirection == "back" then
                    if turnDirection == "left" then
                        searchForButtonDirectionBack = "left"
                    elseif turnDirection == "right" then
                        searchForButtonDirectionBack = "right"
                    end
                end
            else
                if currentDirection == "forth" then
                    if turnDirection == "left" then
                        searchForButtonDirectionForth = "right"
                        print("Changing search for button direction to right")
                    elseif turnDirection == "right" then
                        searchForButtonDirectionForth = "left"
                        print("Changing search for button direction to left")
                    end
                elseif currentDirection == "back" then
                    if turnDirection == "left" then
                        searchForButtonDirectionBack = "right"
                        print("Changing search for button direction to right")
                    elseif turnDirection == "right" then
                        searchForButtonDirectionBack = "left"
                        print("Changing search for button direction to left")
                    end
                end
            end
            robot.use()
            break
        else
            turns = turns + 1
            if turnDirection == "left" then
                robot.turnLeft()
            elseif turnDirection == "right" then
                robot.turnRight()
            end
        end
    end
end
 
function isNextToolAlreadyInInventory()
    toolItem = component.inventory_controller.getStackInInternalSlot(nextToolSlot)
    if toolItem == nil then return false end
    if toolItem.label == "Shears" then
        return true
    end
    return false
end
 
function getToolItem()
    robot.select(maintainSlot)
    component.inventory_controller.equip()
    toolItem = component.inventory_controller.getStackInInternalSlot(maintainSlot)
    component.inventory_controller.equip()
    robot.select(1)
    return toolItem
end
 
function checkTool()
    if isNextToolAlreadyInInventory() == false then
        robot.select(nextToolSlot)
        if robot.suckDown(1) then
            print("Equipping next tool from external storage")
        end
    end
    robot.select(maintainSlot)
    toolItem = getToolItem()
    if toolItem == nil then
        robot.select(nextToolSlot)
        if component.inventory_controller.equip() then
            print("New tool equipped in tool slot")
        else
            print("I´m not happy with my job. Without tools i will quit... for now")
        end
    else
        print(string.format("Current tool damage: %s of %s",toolItem.damage, toolItem.maxDamage))
    end
end
 
function dropAll()
    for x = 1, buttonSlot-1 do 
        robot.select(x)
        robot.drop()
    end
    robot.select(1)
end
 
function rest()
    step = waitTime / 10
    print(string.format("\nSleeping for %s seconds...",waitTime))
    for x = 0,9 do
        os.sleep(step)
        print(string.format("Still sleeping for about %s seconds",waitTime - (x+1)*step))
    end
    print("\nGood Morning little SchoolGirl")
    print("A new day another chance\n")
end
 
function doWork()
    haveWork = true
    while haveWork do
        checkTool()
        robot.select(compareSlot)
        somethingToDo = robot.compare()
        robot.select(1)
        if somethingToDo then
            robot.swing()
            robot.forward()
        else
            robot.forward()
            haveWork = false
        end
    end
end
 
function startUp()
    print("Starting string farm program ...\n")
    os.sleep(1)
    print("Checking inventory ...")
    print("Warmup finished/n")
    while true do 
        checkDirection()
        doWork()
        dropAll()
        pressButton()
        rest()
    end
end
 
startUp()