//! Build recipe
const Build = std.Build;
const CompileStep = Build.CompileStep;
const CrossTarget = std.zig.CrossTarget;
const Mode = std.builtin.Mode;
const getExternalExecutor = std.zig.system.NativeTargetInfo.getExternalExecutor;
const std = @import("std");

fn addExecutable(b: *Build, target: CrossTarget, optimize: Mode) *CompileStep {
    const bin = b.addExecutable(.{
        .name = "roux",
        .root_source_file = .{ .path = "src/main.zig" },
        .target = target,
        .optimize = optimize,
        .link_libc = true,
    });
    const cflags = .{
        "-std=c99", "-g", "-Wall", "-Wextra", "-Wpedantic",
        // https://lists.sr.ht/~mpu/qbe/<CYB4FWK7MACC.2IF4DEL4C9BF1@loang.net>
        "-fno-sanitize=undefined",
    };
    bin.addIncludePath(.{ .path = "." });
    bin.addCSourceFiles(&.{
        "util.c", "parse.c", "abi.c", "cfg.c",
        "mem.c", "ssa.c", "alias.c", "load.c", "copy.c", "fold.c",
        "simpl.c", "live.c", "spill.c", "rega.c", "emit.c",
    }, &cflags);
    bin.addCSourceFiles(&.{
        "amd64/targ.c", "amd64/sysv.c", "amd64/isel.c", "amd64/emit.c",
        "arm64/targ.c", "arm64/abi.c", "arm64/isel.c", "arm64/emit.c",
        "rv64/targ.c", "rv64/abi.c", "rv64/isel.c", "rv64/emit.c",
    }, &cflags);
    return bin;
}

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

    const bin = addExecutable(b, target, optimize);
    b.installArtifact(bin);
    const run_cmd = b.addRunArtifact(bin);
    run_cmd.step.dependOn(b.getInstallStep());
    if (b.args) |args|
        run_cmd.addArgs(args);
    b.step("run", "Run the app").dependOn(&run_cmd.step);

    const tests = b.addTest(.{
        .root_source_file = .{ .path = "src/test.zig" },
        .optimize = optimize,
        .test_runner = "src/test.zig",
    });
    const run_tests = b.addRunArtifact(tests);
    run_tests.addArg("-b");
    run_tests.addArtifactArg(addExecutable(b, .{}, optimize));
    run_tests.addArgs(&.{ "-z", b.zig_exe });
    run_tests.addArgs(&.{ "-t", try target.zigTriple(b.allocator) });
    switch (getExternalExecutor(tests.target_info, bin.target_info, .{})) {
        .native => {},
        .qemu, .darling => |emulator| run_tests.addArgs(&.{ "-e", emulator }),
        .bad_os_or_cpu => return error.BadOsOrCpu,
        else => unreachable,
    }
    if (b.args) |args|
        run_tests.addArgs(args);
    run_tests.has_side_effects = true;
    b.step("test", "Run unit tests").dependOn(&run_tests.step);
}