const builtin = @import("builtin");

const std = @import("std");

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

	const sokol_dependency = b.dependency("sokol", .{
		.target = target,
		.optimize = optimize,
	});

	const coral_module = b.createModule(.{
		.root_source_file = b.path("src/coral/coral.zig"),
	});

	const flow_module = b.createModule(.{
		.root_source_file = b.path("src/flow/flow.zig"),

		.imports = &.{
			.{
				.name = "coral",
				.module = coral_module,
			},
		}
	});

	const ona_module = b.createModule(.{
		.root_source_file = b.path("src/ona/ona.zig"),

		.imports = &.{
			.{
				.name = "sokol",
				.module = sokol_dependency.module("sokol"),
			},

			.{
				.name = "coral",
				.module = coral_module,
			},

			.{
				.name = "flow",
				.module = flow_module,
			},
		},
	});

	ona_module.addIncludePath(b.path("ext/"));
	ona_module.linkLibrary(build_spirvcross(b, target, optimize));

	b.step("test", "Run unit tests").dependOn(create: {
		const tests = b.addTest(.{
			.root_source_file = b.path("src/main.zig"),
			.target = target,
			.optimize = optimize,
		});

		break: create &tests.step;
	});

	b.installArtifact(add: {
		const exe = b.addExecutable(.{
			.name = "main",
			.root_source_file = b.path("src/main.zig"),
			.target = target,
			.optimize = optimize,
		});

		exe.root_module.addImport("ona", ona_module);
		exe.root_module.addImport("coral", coral_module);
		exe.linkLibC();
		exe.linkSystemLibrary("SDL2");

		break: add exe;
	});
}

fn build_spirvcross(
	b: *std.Build,
	target: std.Build.ResolvedTarget,
	mode: std.builtin.OptimizeMode,
) *std.Build.Step.Compile {
	const dir = "ext/spirv-cross/";

	const sources = [_][]const u8{
		"spirv_cross.cpp",
		"spirv_parser.cpp",
		"spirv_cross_parsed_ir.cpp",
		"spirv_cfg.cpp",
		"spirv_glsl.cpp",
		"spirv_msl.cpp",
		"spirv_hlsl.cpp",
		"spirv_reflect.cpp",
		"spirv_cross_util.cpp",
		"spirv_cross_c.cpp",
	};

	const lib = b.addStaticLibrary(.{
		.name = "spirvcross",
		.target = target,
		.optimize = mode,
	});

	switch (lib.rootModuleTarget().abi) {
		.msvc => lib.linkLibC(),
		else => lib.linkLibCpp(),
	}

	inline for (sources) |src| {
		lib.addCSourceFile(.{
			.file = b.path(dir ++ src),
			.flags = &.{"-fstrict-aliasing", "-DSPIRV_CROSS_C_API_GLSL", "-DSPIRV_CROSS_C_API_HLSL", "-DSPIRV_CROSS_C_API_MSL"},
		});
	}

	return lib;
}