Tree farm

chests = {
    "quark:oak_chest",
    "charm:oak_chest",
}
fuel = {
    "minecraft:coal_block",
    "actuallyadditions:block_misc",
    "quark:charcoal_block",
}

droppedItems = {
    "minecraft:stick",
    "minecraft:apple"
}

function dropTrash()
    for slotNum = 1, 16, 1 do
        local item = turtle.getItemDetail(slotNum)
        if(item ~= nil) then
            for FilterIndex = 1, #droppedItems, 1 do
                if(item.name == droppedItems[FilterIndex]) then
                print("Droppign - " .. item.name)
                turtle.select(slotNum)
                turtle.dropDown()
                end
            end
        end
    end
end

function getFuelIndex()
    for slotNum = 1, 16, 1 do
        local Item = turtle.getItemDetail(slotNum)
        if(Item ~=nil) then
            for fuelIndex =1, #fuel, 1 do
                if(Item.name == fuel[fuelIndex]) then
                return slotNum
                end
            end
        end
    end
end

function refuel()
    if(turtle.getFuelLevel() < 400) then
    local Index = getFuelIndex()
      if(Index ~= nil) then
      turtle.select(Index)
      turtle.refuel(2)
      end
    end
end

function checkGrowth()
    grown = turtle.detect()
    if grown ~= true then
        isGrown = false
    elseif grown == true then
        isGrown = true
    end
end

function getSaplingIndex()
    for slotNum = 1, 16,1 do
       local item = turtle.getItemDetail(slotNum)
       if(item ~= nil) then
           if (item.name == "byg:fir_sapling") then
               return slotNum
           end
       end
    end
end

function turtleRefill()

    isBlock, data = turtle.inspectDown()
    if (data.name == "upgrade_aquatic:driftwood_chest") then
        fuelSlot = getFuelIndex()
        if fuelSlot ~= nil then
            turtle.select(fuelSlot)
            local coalBlocks = turtle.getItemCount()
            if coalBlocks <= 30 then
                turtle.suckDown(20)
            end
        elseif fuelSlot == nil then
            turtle.suckDown(30)
        end
    refuel()
    end
    turtle.forward()
    isBlock, data = turtle.inspectDown()
    if (data.name == "charm:oak_chest") then
        sapSlot = getSaplingIndex()
        if sapSlot ~= nil then
            turtle.select(sapSlot)
            local saplings = turtle.getItemCount()
            if saplings <= 30 then
                turtle.suckDown(20)
            end
        elseif sapSlot == nil then
            turtle.suckDown(30)
        end
    elseif (data.name ~= "upgrade_aqatic:driftwood_chest") then
        print("error finding chest")
    end
    turtle.turnRight()
    turtle.forward()
    turtle.forward()
end

function plantTree()
    local index = getSaplingIndex()
    if (index ~= nil) then
        turtle.select(index)
        turtle.placeDown()
    elseif (index == nil) then
        print("Need saplings")
    end
end

function cutTree()
    turtle.dig()
    turtle.forward()
    local isBlock,isSap = turtle.inspectDown()
    if isSap.name ~= "byg:fir_sapling" then
        turtle.digDown()
        local treeLeft = turtle.detectUp()
        local hight = 0
        while treeLeft == true do
            turtle.digUp()
            turtle.up()
            hight = hight + 1
            treeLeft = turtle.detectUp()
        end
        for i = 1, hight, 1 do
            turtle.down()
        end
        plantTree()
    end
end

function depositWood()
    for slotNum = 1, 16 ,1 do
        local item = turtle.getItemDetail(slotNum)
        if(item ~= nil) then
            if(item.name == "byg:fir_log") then
                local itemCount = turtle.getItemCount(slotNum)
                turtle.select(slotNum)
                turtle.dropDown(itemCount)
            end
        end
    end
end

function goBackToStart()
    turtle.forward()
    turtle.turnRight()
    atStart = false
    while atStart == false do
        local isBlock, data= turtle.inspectDown()
        if (data.name == "byg:fir_fence" ) then
            turtle.forward()
        elseif (data.name == "snowrealmagic:fence") then
            turtle.forward()
        elseif (data.name == "byg:fir_fence_gate") then
            turtle.turnRight()
            turtle.forward()
        elseif (data.name == "upgrade_aquatic:driftwood_chest") then
            atStart = true
        elseif (isBlock ~= true) then
            turtle.forward()
        end
    end
end

function cutRow()
    checkGrowth()
    maxwait = 1
    while grown ~= true do
        sleep(30)
        checkGrowth()
        maxwait = maxwait + 1
        if maxwait >= 6 then
            grown = true
        end
    end
        cutTree()
        cutTree()
        cutTree()
        cutTree()
end

function nextRowRight()
    turtle.forward()
    turtle.turnRight()
    turtle.forward()
    turtle.forward()
    turtle.turnRight()
end

function nextRowLeft()
    turtle.forward()
    turtle.turnLeft()
    turtle.forward()
    turtle.forward()
    turtle.turnLeft()
end

function cutTrees()
        cutRow()
        nextRowRight()
        cutRow()
        nextRowLeft()
        cutRow()
        turtle.forward()
        dropTrash()
        turtle.forward()
        turtle.forward()
        depositWood()
        turtle.turnRight()
        turtle.forward()
        goBackToStart()
        turtleRefill()
end

while true do
    cutTrees()
end