harvest

run = true

blockCount = 0
SLOT_COUNT = 16
function getItemIndex(itemName)
    for slot = 1, SLOT_COUNT, 1 do
        local item = turtle.getItemDetail(slot)
        if (item ~= nil) then
            if(item["name"] ==itemName) then
                return slot
            end
        end
    end
end

function grab()
    for i = 1, 6, 1 do
        turtle.suck()
    end
end


function fuelCheck()
    local coalIndex = getItemIndex("minecraft:coal")
    if turtle.getFuelLevel() < 100 then
        if coalIndex ~= nil then
            turtle.select(coalIndex)
            turtle.refuel()
        else
            return false
        end
    end
end
function growCheck()
    local isBlock, data = turtle.inspect()
    while true do
        if (data["state"]["age"] == 7) then
            return true
        else
            return false
        end
    end
end

function boundaryDetect()
    local isBlock, data = turtle.inspectDown()
    while true do
        if isBlock then
            if data["name"] == "minecraft:planks" then
                return true
            else
                return false
            end
        else
            return false
        end
    end
end

function selectNext()
    local wheatSeedIndex = getItemIndex("minecraft:wheat_seeds")
    fuelCheck()
    turtle.turnRight()
    turtle.forward()
    blockCount = blockCount + 1
    turtle.turnLeft()
    if boundaryDetect() then
        if fuelCheck() == false then
            turtle.suckUp()
            fuelCheck()
        end
        startOver()
    end
end


function harvest()
    while true do
        local wheatSeedIndex = getItemIndex("minecraft:wheat_seeds")
        local boneMealIndex = getItemIndex("minecraft:bone_meal")
        if turtle.inspect() == false then
            turtle.select(wheatSeedIndex)
            turtle.place()
            if boneMealIndex ~= nil then
                turtle.select(boneMealIndex)
                repeat
                    turtle.place()
                until growCheck() or boneMealIndex == nil
            end
            selectNext()
        elseif (growCheck()) then
            turtle.dig()
            grab()
            turtle.select(wheatSeedIndex)
            turtle.place()
            selectNext()
        elseif boneMealIndex ~= nil then
            turtle.select(boneMealIndex)
            repeat
                turtle.place()
            until growCheck() or boneMealIndex == nil
        else
            selectNext()
        end
    end
end


function startOver()
    local wheatIndex = getItemIndex("minecraft:wheat")
    turtle.turnLeft()
    for i = 1, blockCount, 1 do
        turtle.forward()
        fuelCheck()
    end
    if wheatIndex ~= nil then
        while true do
            turtle.select(wheatIndex)
            turtle.drop(turtle.getItemCount(wheatIndex))
            if turtle.getItemCount(wheatIndex) == 0 then
                break
            end
        end
    end
    turtle.turnRight()
    blockCount = 0
end

harvest()