const std = @import("std");

pub const ModLib = struct {
    b: *std.Build,
    lib: *std.Build.Step.Compile,
    mod: *std.Build.Module,

    pub fn install(self: @This()) void {
        self.b.installArtifact(self.lib);
    }
};

pub const ModLibOptions = struct {
    name: []const u8,
    target: std.Build.ResolvedTarget,
    optimize: std.builtin.OptimizeMode,
    static_build: bool,
    allow_dynamic: bool = false,
    link_libc: bool = false,
    link_libcpp: bool = false,
    root: ?std.Build.LazyPath = null,
    stub: ?std.Build.LazyPath = null,
};

pub fn MakeModlib(b: *std.Build, o: ModLibOptions) ModLib {
    const mod = b.addModule(o.name, .{
        .target = o.target,
        .optimize = o.optimize,
        .root_source_file = if (o.root != null) o.root.? else b.path(b.fmt("src/{s}", .{o.name})),
    });

    const empty_file = b.addWriteFile("stubs", "");

    const lib = b.addLibrary(.{
        .name = o.name,
        .linkage = if (o.allow_dynamic and !o.static_build) .dynamic else .static,
        .root_module = b.createModule(.{
            .root_source_file = empty_file.add("stubc.zig", ""),
            .target = o.target,
            .optimize = o.optimize,
        }),
    });

    return .{
        .b = b,
        .lib = lib,
        .mod = mod,
    };
}

pub const Options = struct {
    target: std.Build.ResolvedTarget,
    optimize: std.builtin.OptimizeMode,
    static_build: bool,
    tracy: bool,
};

// standard set of options that all backlog modules and dependenices shall use.
pub fn declareOptions(b: *std.Build) Options {
    return .{
        .target = b.standardTargetOptions(.{}),
        .optimize = b.standardOptimizeOption(.{}),
        .static_build = b.option(bool, "static_build", "builds backlog dependencies for static linking") orelse false,
        .tracy = b.option(bool, "tracy", "builds with tracy support") orelse false,
    };
}

pub fn build(b: *std.Build) void {
    const target = b.standardTargetOptions(.{});
    const optimize = b.standardOptimizeOption(.{});
    const static_build = b.option(bool, "static_build", "builds backlog dependencies for static linking") orelse false;

    const r = MakeModlib(b, .{
        .name = "bh",
        .target = target,
        .optimize = optimize,
        .static_build = static_build,
    });

    b.installArtifact(r.lib);

    const test_step = b.step("test", "run unit tests for enet");
    const tests = b.addTest(.{
        .root_module = b.createModule(.{
            .link_libc = true,
            .target = target,
            .optimize = optimize,
            .root_source_file = b.path("src/tests.zig"),
        }),
    });

    const runArtifact = b.addRunArtifact(tests);
    test_step.dependOn(&runArtifact.step);
}