const std = @import("std");

const nr_of_days = 12;

pub fn build(b: *std.Build) void {
    const target = b.standardTargetOptions(.{});
    const optimize = b.standardOptimizeOption(.{});

    const run_all = b.step("run", "Run all days");

    const day_option = b.option(usize, "day", "Build day");

    for (1..nr_of_days + 1) |day| {
        const exe = b.addExecutable(.{
            .name = b.fmt("run-day{d:0>2}", .{day}),
            .root_module = b.createModule(.{
                .root_source_file = b.path("src/main.zig"),
                .target = target,
                .optimize = optimize,
            }),
        });
        exe.root_module.addAnonymousImport("day", .{
            .root_source_file = b.path(b.fmt("src/days/day{d:0>2}.zig", .{day})),
        });
        b.installArtifact(exe);

        if (day_option == null or day_option == day) {
            const run_cmd = b.addRunArtifact(exe);
            run_all.dependOn(&run_cmd.step);
        }
    }
}