const std = @import("std");

// Although this function looks imperative, note that its job is to
// declaratively construct a build graph that will be executed by an external
// runner.
pub fn build(b: *std.Build) !void {
    // Standard target options allows the person running `zig build` to choose
    // what target to build for. Here we do not override the defaults, which
    // means any target is allowed, and the default is native. Other options
    // for restricting supported target set are available.
    const target = b.standardTargetOptions(.{});

    // Standard optimization options allow the person running `zig build` to select
    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
    // set a preferred release mode, allowing the user to decide how to optimize.
    const optimize = b.standardOptimizeOption(.{});

    // This creates a "module", which represents a collection of source files alongside
    // some compilation options, such as optimization mode and linked system libraries.
    // Every executable or library we compile will be based on one or more modules.
    const mod = b.addModule("acpi", .{
        // `root_source_file` is the Zig "entry point" of the module. If a module
        // only contains e.g. external object files, you can make this `null`.
        // In this case the main source file is merely a path, however, in more
        // complicated build scripts, this could be a generated file.
        .root_source_file = b.path("src/root.zig"),
        .target = target,
        .optimize = optimize,
    });

    const uacpi = b.dependency("uacpi", .{});
    var flags: std.ArrayList([]const u8) = .init(b.allocator);

    for (b.debug_log_scopes) |scope| {
        if (std.mem.eql(u8, scope, "uacpi")) {
            try flags.append("-DUACPI_DEFAULT_LOG_LEVEL=UACPI_LOG_TRACE");
            break;
        }
    }

    mod.addIncludePath(uacpi.path("include"));
    mod.addCSourceFiles(.{
        .root = uacpi.path("source"),
        .files = &.{
            "default_handlers.c",
            "event.c",
            "interpreter.c",
            "io.c",
            "mutex.c",
            "namespace.c",
            "notify.c",
            "opcodes.c",
            "opregion.c",
            "osi.c",
            "registers.c",
            "resources.c",
            "shareable.c",
            "sleep.c",
            "stdlib.c",
            "tables.c",
            "types.c",
            "uacpi.c",
            "utilities.c",
        },
        .flags = try flags.toOwnedSlice(),
    });

    // Creates a step for unit testing. This only builds the test executable
    // but does not run it.
    const unit_tests = b.addTest(.{
        .root_module = mod,
    });

    const run_unit_tests = b.addRunArtifact(unit_tests);

    // Similar to creating the run step earlier, this exposes a `test` step to
    // the `zig build --help` menu, providing a way for the user to request
    // running the unit tests.
    const test_step = b.step("test", "Run unit tests");
    test_step.dependOn(&run_unit_tests.step);
}