using DelimitedFiles

course = readdlm("day2input.txt")

depth = 0
horizontal = 0

for row in 1:size(course, 1)
    global horizontal, depth
    direction = course[row, 1]
    value = course[row, 2]
    if direction == "forward"
        horizontal += value
    elseif direction == "up"
        depth -= value
    elseif direction == "down"
        depth += value
    end
end

println("depth = ", depth)
println("horiz = ", horizontal)
println("prod  = ", depth * horizontal)

depth = 0
horizontal = 0
aim = 0

for row in 1:size(course, 1)
    global horizontal, depth, aim
    direction = course[row, 1]
    value = course[row, 2]
    if direction == "forward"
        horizontal += value
        depth += value * aim
    elseif direction == "up"
        aim -= value
    elseif direction == "down"
        aim += value
    end
end

println("depth = ", depth)
println("horiz = ", horizontal)
println("aim   = ", aim)
println("prod  = ", depth * horizontal)