const input = @embedFile("input2");
const std = @import("std");

pub fn main() !void{

    var horizontal: usize = 0;
    var depth: usize = 0;
    var aim: usize = 0;

    var iter = std.mem.tokenize(u8, input, "\n "); // You can split on 2 delimeters, by adding them to the string

    while(iter.next())|direction|{
        var value = try std.fmt.parseInt(usize, iter.next().?, 10);

        if(std.mem.eql(u8, direction, "up")){ aim -= value; }
        if(std.mem.eql(u8, direction, "down")){ aim += value; }
        if(std.mem.eql(u8, direction, "forward")){ 
            horizontal += value; 
            depth += (aim * value);
        }
    }

    std.debug.print("result: {}", .{depth * horizontal});
}

test "Part 1"{

    var horizontal: usize = 0;
    var depth: usize = 0;

    var iter = std.mem.tokenize(u8, input, "\n "); // You can split on 2 delimeters, by adding them to the string

    while(iter.next())|direction|{
        var value = try std.fmt.parseInt(usize, iter.next().?, 10);

        if(std.mem.eql(u8, direction, "forward")){ horizontal += value; }
        if(std.mem.eql(u8, direction, "up")){ depth -= value; }
        if(std.mem.eql(u8, direction, "down")){ depth += value; }

    }


    std.testing.expect(1762050 == (depth * horizontal));
}




test "part 2"{

    var horizontal: usize = 0;
    var depth: usize = 0;
    var aim: usize = 0;

    var iter = std.mem.tokenize(u8, input, "\n "); // You can split on 2 delimeters, by adding them to the string

    //First token is the direction
    while(iter.next())|direction|{
        var value = try std.fmt.parseInt(usize, iter.next().?, 10);

        if(std.mem.eql(u8, direction, "up")){   aim -= value; }
        if(std.mem.eql(u8, direction, "down")){ aim += value; }
        if(std.mem.eql(u8, direction, "forward")){ 
            horizontal  += value; 
            depth       += (aim * value);
        }
    }

    std.testing.expect(1855892637 == (depth * horizontal));
}