const std = @import("std");
const path = "../data/day17/input.txt";
const RetType = u14;
const TargetValue = i9;
const TargetArea = struct {
    xmin: TargetValue,
    xmax: TargetValue,
    ymin: TargetValue,
    ymax: TargetValue,
};
fn parseInput() !TargetArea {
    const input = @embedFile(path);
    const in = std.mem.trimRight(u8, input, "\n");
    var ta: TargetArea = undefined;
    var coords = std.mem.tokenize(u8, in[13..], ", ");
    var xpart = coords.next().?[2..];
    var xcords = std.mem.tokenize(u8, xpart, "..");
    ta.xmin = try std.fmt.parseInt(TargetValue, xcords.next().?, 10);
    ta.xmax = try std.fmt.parseInt(TargetValue, xcords.next().?, 10);
    var ypart = coords.next().?[2..];
    var ycords = std.mem.tokenize(u8, ypart, "..");
    ta.ymin = try std.fmt.parseInt(TargetValue, ycords.next().?, 10);
    ta.ymax = try std.fmt.parseInt(TargetValue, ycords.next().?, 10);
    return ta;
}
pub fn first() !RetType {
    const ta = try parseInput();
    // https://github.com/timvisee/advent-of-code-2021/issues/9
    var ret = @intCast(RetType, -ta.ymin);
    ret *= @intCast(RetType, -ta.ymin - 1);
    ret /= 2;
    return ret;
}
pub fn main() !void {
    var timer = try std.time.Timer.start();
    const ret = try first();
    const t = timer.lap() / 1000;
    try std.testing.expectEqual(@as(RetType, 5778), ret);
    std.debug.print("Day 17a result: {d} \t\ttime: {d}µs\n", .{ ret, t });
}
test "day17a" {
    try std.testing.expectEqual(@as(RetType, 5778), try first());
}

target area: x=169..206, y=-108..-68