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 lib_mod = b.createModule(.{
        // `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,
        .link_libc = true,
    });

    lib_mod.addIncludePath(b.path("../../../"));
    lib_mod.addIncludePath(b.path("../../../include/"));
    lib_mod.addLibraryPath(b.path("./"));

    // Now, we will create a static library based on the module we created above.
    // This creates a `std.Build.Step.Compile`, which is the build step responsible
    // for actually invoking the compiler.
    const lib = b.addLibrary(.{
        .linkage = .dynamic,
        .name = "game",
        .root_module = lib_mod,
    });

    lib.linkSystemLibrary("townengine");

    // This declares intent for the library to be installed into the standard
    // location when the user invokes the "install" step (the default step when
    // running `zig build`).
    const install_artifact = b.addInstallArtifact(lib, .{
        .dest_dir = .{
            .override = .{
                .custom = "../",
            },
        },
    });
    b.getInstallStep().dependOn(&install_artifact.step);
}