const std = @import("std");


pub fn build(b: *std.Build) void {
	const target = b.standardTargetOptions(.{});
	const optimize = b.standardOptimizeOption(.{});
	
	// === [ C IMPORTS ] ===
	const c = b.addModule("c", .{
		.root_source_file = b.path("src/c.zig"),
		.target = target,
		.optimize = optimize,
	});
	c.linkSystemLibrary("SDL3", .{});
	c.addIncludePath(b.path("open-simplex/include"));
	c.linkSystemLibrary("SDL3_image", .{});

	// === [ ENGINE ] ===
	const engine = b.addModule("engine", .{
		.root_source_file = b.path("src/engine/root.zig"),
		.target = target,
		.optimize = optimize,
	});
	engine.addImport("engine", engine);
	engine.addImport("c", c);

	// === [ GAME CODE ] ===
	const hadean = b.addModule("hadean", .{
		.root_source_file = b.path("src/hadean/hadean.zig"),
		.target = target,
		.optimize = optimize,
	});
	hadean.addImport("c", c);
	hadean.addImport("engine", engine);
	hadean.addImport("hadean", hadean);

	// === [ EXECUTABLE ] ===
	const exe = b.addExecutable(.{
		.name = "hadean",
		.root_source_file = b.path("src/main.zig"),
		.target = target,
		.optimize = optimize,
	});
	

	exe.root_module.addImport("engine", engine);
	exe.root_module.addImport("hadean", hadean);
	exe.root_module.addImport("c", c);
	exe.addCSourceFile(.{ .file = b.path("open-simplex/src/OpenSimplex2F.c") });
	exe.addIncludePath(b.path("open-simplex/include"));

	exe.linkLibC();
	exe.root_module.addRPathSpecial("$ORIGIN/../lib");

	b.getInstallStep().dependOn(&(b.addInstallFile(.{
		.cwd_relative = "/usr/local/lib/libSDL3.so.0.1.7"
	}, "lib/libSDL3.so.0")).step);
	b.getInstallStep().dependOn(&(b.addInstallFile(.{
		.cwd_relative = "/usr/local/lib/libSDL3_image.so.0.1.0"
	}, "lib/libSDL3_image.so.0")).step);
	b.getInstallStep().dependOn(&(b.addInstallFile(
		b.path("assets/textures.png"),
		"assets/textures.png"
	)).step);
    


	b.installArtifact(exe);
	const run_cmd = b.addRunArtifact(exe);
	run_cmd.step.dependOn(b.getInstallStep());
	if (b.args) |args| {
		run_cmd.addArgs(args);
	}
	const run_step = b.step("run", "Run the app");
	run_step.dependOn(&run_cmd.step);

	const pathfinder_perf_test = b.addTest(.{
		.root_source_file = b.path("src/hadean/PathFinder.zig"),
		.target = target,
		.optimize = optimize,
	});
	pathfinder_perf_test.root_module.addImport("engine", engine);
	const run_pathfinder_perf_test = b.addRunArtifact(pathfinder_perf_test);


	const test_step = b.step("pathfinder_perf_test", "Run PathFinder Performance Test");
	test_step.dependOn(&run_pathfinder_perf_test.step);

	// because engine and hadean are diff modules their c modules
	// get different caches, causing opaques to be different between them.
	// kinda makes sense, because zig is namespacy and c is not!
	// it would be nice to in some way ensure both got the same version, though.
}