const std = @import("std");

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

    const miclib_include = b.option(
        []const u8,
        "miclib_include",
        "Directory containing miclib.h and scif.h. Example: -Dmiclib_include=/usr/local/include",
    );

    const miclib_libdir = b.option(
        []const u8,
        "miclib_libdir",
        "Directory containing libmicmgmt.so/libscif.so. Example: -Dmiclib_libdir=/usr/local/lib",
    );

    const miclib_name = b.option(
        []const u8,
        "miclib_name",
        "System library name for miclib without lib/extension. Default: micmgmt",
    ) orelse "micmgmt";

    const module = b.addModule("miclib", .{
        .root_source_file = b.path("src/lib.zig"),
        .target = target,
        .optimize = optimize,
        .link_libc = true,
    });
    configureMiclibModule(module, miclib_include, miclib_libdir, miclib_name);

    const test_module = b.createModule(.{
        .root_source_file = b.path("src/lib.zig"),
        .target = target,
        .optimize = optimize,
        .link_libc = true,
    });
    configureMiclibModule(test_module, miclib_include, miclib_libdir, miclib_name);

    const c_includes = b.addTranslateC(.{
        .root_source_file = b.path("src/c_includes.h"),
        .target = target,
        .optimize = optimize,
        .link_libc = true,
    });

    module.addImport("miclib_c", c_includes.createModule());

    const lib_tests = b.addTest(.{ .root_module = test_module });
    const run_tests = b.addRunArtifact(lib_tests);
    const test_step = b.step("test", "Run unit tests");
    test_step.dependOn(&run_tests.step);

    const enumerate_module = b.createModule(.{
        .root_source_file = b.path("examples/enumerate.zig"),
        .target = target,
        .optimize = optimize,
        .imports = &.{.{ .name = "miclib", .module = module }},
    });

    const enumerate = b.addExecutable(.{
        .name = "miclib-enumerate",
        .root_module = enumerate_module,
    });

    b.installArtifact(enumerate);

    const run_enumerate = b.addRunArtifact(enumerate);
    const run_step = b.step("example", "Run examples/enumerate.zig");
    run_step.dependOn(&run_enumerate.step);
}

fn configureMiclibModule(module: *std.Build.Module, miclib_include: ?[]const u8, miclib_libdir: ?[]const u8, miclib_name: []const u8) void {
    if (miclib_include) |path|
        module.addIncludePath(.{ .cwd_relative = path });

    if (miclib_libdir) |path|
        module.addLibraryPath(.{ .cwd_relative = path });

    module.link_libcpp = true;
    module.linkSystemLibrary(miclib_name, .{});
    module.linkSystemLibrary("scif", .{});
}