minecraft_harvest_watermelon_and_pumpkin

local DigTargetBlocks = { "minecraft:melon_block", "minecraft:pumpkin" }
local DropTargetItems = { "minecraft:melon", "minecraft:pumpkin" }
local DigBlackList = { "minecraft:melon_stem", "minecraft:pumpkin_stem", "minecraft:torch", "minecraft:spruce_fence", "minecraft:spruce_fence_gate", "storagedrawers:basicdrawers", "storagedrawers:controller" }

local NeedToBackStartPos = 9
local NormalFlowCount = 1
local MinFuelLevel = 50

local function ContainsInArray(Target, Arr)
    for i = 1, #Arr do
        if Target == Arr[i] then
            return true
        end
    end
    return false
end

local function Dig(DigFunc, InspectFunc)
    local blockExist, itemInfo = InspectFunc()
    if not blockExist then
        print("block is not found")
        return true
    end
    if ContainsInArray(itemInfo.name, DigBlackList) then
        print("Front block is in black list")
        return false
    else
        DigFunc()
        return true
    end
end

local function GoForward(MoveCount)
    for i = 1, MoveCount do
        while not turtle.forward() do
            if turtle.detect() then
                Dig(turtle.dig, turtle.inspect)
            else
                turtle.attack()
            end
        end
    end
end

local function BlockIsDigTargetBlock(BlockInfo)
    return ContainsInArray(BlockInfo.name, DigTargetBlocks)
end

local function MoveAndHarvest()
    for i = 1, 6 do
        GoForward(1)
        local blockExist, itemInfo = turtle.inspectDown()
        if blockExist and BlockIsDigTargetBlock(itemInfo) then
            Dig(turtle.digDown, turtle.inspectDown)
        end
    end
end

local function MoveOppositeSide()
    MoveAndHarvest()
    GoForward(1)
end

local function MoveBase(TurnFunc)
    MoveOppositeSide()
    TurnFunc()
    GoForward(3)
    TurnFunc()
end

local function MoveBaseNotLastMove(FirstTurnFunc, SecondTurnFunc)
    MoveBase(FirstTurnFunc)
    MoveBase(SecondTurnFunc)
end

local function MoveBaseLastMove(TurnFunc)
    MoveBase(TurnFunc)

    MoveOppositeSide()
    TurnFunc()
    GoForward(NeedToBackStartPos)
end

local function HarvestWaterMelonAndPumpkin()
    for i = 1, NormalFlowCount do
        MoveBaseNotLastMove(turtle.turnRight, turtle.turnLeft)
    end
    MoveBaseLastMove(turtle.turnRight)

end

local function TurnBack()
    turtle.turnRight()
    turtle.turnRight()
end

local function refuel()
    while turtle.getFuelLevel() < MinFuelLevel do
        turtle.suck()
        turtle.refuel()
    end
end

local function IsDropTargetItem(targetSlot)
    local itemDetail = turtle.getItemDetail(targetSlot)
    if itemDetail == nil then
        return false
    end
    return ContainsInArray(itemDetail.name, DropTargetItems)
end

while true do
    if turtle.getFuelLevel() < MinFuelLevel then
        turtle.turnLeft()
        print("refuel")
        refuel()
        TurnBack()
    else
        turtle.turnRight()
    end
    print("Start harvest")
    HarvestWaterMelonAndPumpkin()
    print("Drop item")
    for i = 1, 16 do
        if IsDropTargetItem(i) then
            turtle.select(i)
            turtle.dropDown()
        end
    end
    turtle.select(1)
    print("Sleep 60 sec")
    os.sleep(60)
end