const std = @import("std");

pub fn build(b: *std.Build) void {
    const target = std.zig.CrossTarget{
        .cpu_arch = .riscv64,
        .os_tag = .freestanding,
    };

    const optimize = b.standardOptimizeOption(.{});

    const exe = b.addExecutable(.{
        .name = "kernel",
        .root_source_file = .{ .path = "kernel/main.c" },
        .target = target,
        .optimize = optimize,
    });

    exe.setLinkerScriptPath("kernel/kernel.ld");
    exe.addIncludePath("kernel");
    exe.addCSourceFiles(&.{
        "kernel/bio.c",
        "kernel/console.c",
        "kernel/exec.c",
        "kernel/file.c",
        "kernel/fs.c",
        "kernel/kalloc.c",
        "kernel/log.c",
        "kernel/main.c",
        "kernel/pipe.c",
        "kernel/plic.c",
        "kernel/printf.c",
        "kernel/proc.c",
        "kernel/ramdisk.c",
        "kernel/sleeplock.c",
        "kernel/spinlock.c",
        "kernel/start.c",
        "kernel/string.c",
        "kernel/syscall.c",
        "kernel/sysfile.c",
        "kernel/sysproc.c",
        "kernel/trap.c",
        "kernel/uart.c",
        "kernel/virtio_disk.c",
        "kernel/vm.c",
    }, &.{
        "-Wall",
        "-Werror",
        "-O",
        "-fno-omit-frame-pointer",
        "-ggdb",
        "-gdwarf-2",
        "-MD",
        "-mcmodel=medany",
        "-ffreestanding",
        "-fno-common",
        "-nostdlib",
        "-mno-relax",
        "-fno-pie",
        "-no-pie",
    });

    b.installArtifact(exe);

    const run_cmd = b.addRunArtifact(exe);

    run_cmd.step.dependOn(b.getInstallStep());

    if (b.args) |args| {
        run_cmd.addArgs(args);
    }

    const run_step = b.step("run", "Run the app");
    run_step.dependOn(&run_cmd.step);

    const unit_tests = b.addTest(.{
        .root_source_file = .{ .path = "src/main.zig" },
        .target = target,
        .optimize = optimize,
    });

    const run_unit_tests = b.addRunArtifact(unit_tests);

    const test_step = b.step("test", "Run unit tests");
    test_step.dependOn(&run_unit_tests.step);
}