const std = @import("std");

///
/// Builds the engine, tools, and dependencies of all.
///
pub fn build(builder: *std.build.Builder) void {
    const target = builder.standardTargetOptions(.{});
    const mode = builder.standardReleaseOptions();
    const core_pkg = projectPkg("core", &.{});

    // Ona executable.
    {
        const exe = builder.addExecutable("ona", "./src/ona/main.zig");

        exe.addPackage(projectPkg("oar", &.{core_pkg}));
        exe.addPackage(core_pkg);
        exe.setTarget(target);
        exe.setBuildMode(mode);
        exe.install();
        exe.addIncludeDir("./ext");
        exe.linkSystemLibrary("SDL2");
        exe.linkLibC();
    }

    // Oar executable.
    {
        const exe = builder.addExecutable("oar", "./src/oar/main.zig");

        exe.addPackage(core_pkg);
        exe.setTarget(target);
        exe.setBuildMode(mode);
        exe.install();
    }

    // Tests executable.
    {
        const tests = builder.addTestExe("test", "./src/tests.zig");

        tests.addPackage(core_pkg);
        tests.setTarget(target);
        tests.setBuildMode(mode);
        builder.step("test", "Run unit tests").dependOn(&tests.step);
    }
}

///
/// Returns a [std.build.Pkg] within the project codebase path at `name` with `dependencies` as its
/// dependencies.
///
fn projectPkg(comptime name: []const u8, dependencies: []const std.build.Pkg) std.build.Pkg {
    return std.build.Pkg{
        .name = name,
        .path = .{.path = "./src/" ++ name ++ "/main.zig"},
        .dependencies = dependencies,
    };
}