oil_finder_turtle

while true do
    local oil_block = "tfmg:oil_deposit"
    local computer_id = 1
    rednet.open("left")

    local function check_surroundings()
        local x, y, z = gps.locate()
        local results = {}
        local s, r = turtle.inspectUp()

        table.insert(results, r)
        s, r = turtle.inspectDown()
        table.insert(results, r)
        for i = 1, 4, 1 do
            s, r = turtle.inspect()
            table.insert(results, r)
            turtle.turnRight()
        end
        table.foreach(results, function(a,b)
            if type(b) == "table" and b.name == oil_block then
                rednet.send(computer_id, {{x,y,z},turtle.getFuelLevel(), true})
                error("",0)
            end
        end)
        rednet.send(computer_id, {{x,y,z},turtle.getFuelLevel(), false})
    end

    local function refuel_toss()
        for i = 1, 16, 1 do
            turtle.select(i)
            if turtle.getItemDetail(i) ~= nil and not string.find(turtle.getItemDetail().name, "coal") then
                turtle.drop()
            end
            turtle.refuel()
        end
        turtle.select(1)
    end

    local function full_down()
        repeat
            turtle.down()
            check_surroundings()
        until not turtle.digDown() and turtle.detectDown()
    end
    local function return_to_base_height()
        local x, y, z = gps.locate()
        while y ~= -59 do
            x, y, z = gps.locate()
            turtle.up()
        end
    end

    full_down()
    check_surroundings()
    return_to_base_height()

    for z = 1, 15, 1 do
        for x = 1, 15, 1 do
            refuel_toss()
            turtle.dig()
            turtle.forward()
            full_down()
            return_to_base_height()
        end
        if z % 2 == 0 then
            turtle.turnLeft()
            turtle.dig()
            turtle.forward()
            full_down()
            return_to_base_height()
            turtle.turnLeft()
        else
            turtle.turnRight()
            turtle.dig()
            turtle.forward()
            full_down()
            return_to_base_height()
            turtle.turnRight()
        end
    end
end