const std  = @import("std");
const arch = @import("builtin").cpu.arch;

pub fn build(b: *std.Build) void
{
    const target = b.resolveTargetQuery(.{
        .cpu_arch = arch,
        .os_tag   = .linux,
        .abi      = .musl
    });
    const optimize = b.standardOptimizeOption(.{});

    const version = getGitVersion(b);

    const options = b.addOptions();
    options.addOption([]const u8, "version", version);

    // deps

    const toml_dep = b.dependency("toml", .{
        .target   = target,
        .optimize = optimize,
    });

    const args_dep = b.dependency("args", .{
        .target   = target,
        .optimize = optimize,
    });

    //

    const mod = b.addModule("zocket", .{
        .root_source_file = b.path("src/root.zig"),
        .target           = target,
    });

    const test_mod = b.createModule(.{
        .root_source_file = b.path("src/root.zig"),
        .target           = target,
        .link_libc        = true,
    });

    mod.addImport("toml", toml_dep.module("toml"));
    mod.addImport("args", args_dep.module("args"));

    test_mod.addImport("toml", toml_dep.module("toml"));
    test_mod.addImport("args", args_dep.module("args"));

    const exe = b.addExecutable(.{
        .name        = "zocket",
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/main.zig"),
            .target           = target,
            .optimize         = optimize,
            .imports          = &.{
                .{ .name = "zocket", .module = mod },
            },
        }),
    });

    exe.root_module.addOptions("build_options", options);

    //

    b.installArtifact(exe);

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

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

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

    const mod_tests = b.addTest(.{
        .root_module = test_mod,
    });

    const run_mod_tests = b.addRunArtifact(mod_tests);

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

fn getGitVersion(b: *std.Build) []const u8
{
    const result = b.runAllowFail(
        &.{ "git", "describe", "--tags", "--always", "--dirty" },
        undefined,
        .inherit,
    ) catch return "0.0.0-unknown";

    return b.dupe(std.mem.trim(u8, result, " \n\r\t"));
}