local robot = require("robot")

-- Moves forward n blocks.
-- Waits if there is an obstruction
local function forward(n, mine)
    for _ = 1, n do
        while true do
            local result, error = robot.forward()
            if result then
                break
            else
                if mine and error == "solid" then
                    robot.swing()
                else
                    print("Cannot move: " .. error)
                end
            end
        end
    end
end

-- Move until it runs into a solid block.
-- Waits if there is an entity obstrucion
-- Returns number of blocks moved.
local function forward_until_solid()
    local moved = 0
    while true do
        local result, error = robot.forward()
        if result then
            moved = moved + 1
        else
            if error == "solid" then
                return moved
            end
        end
    end
end

return {
    forward = forward,
    forward_until_solid = forward_until_solid,
}