#include "platform/platform.h"

#if defined(KPLATFORM_APPLE)

#	include <vulkan/vulkan_core.h>
#	include <vulkan/vulkan_metal.h>

// Loading function pointers
#	include <dlfcn.h>

#	define VK_USE_PLATFORM_METAL_EXT
#	include <vulkan/vulkan.h>

#	include <containers/darray.h>
#	include <logger.h>
#	include <memory/kmemory.h>
#	include <platform/platform.h>

#	include "platform/vulkan_platform.h"
#	include "vulkan_types.h"

// Forward declarations for Obj-C "classes" in the platform implementation.
typedef struct ContentView ContentView;
typedef struct WindowDelegate WindowDelegate;
typedef struct NSWindow NSWindow;

typedef struct macos_handle_info {
	u32 dummy;
} macos_handle_info;

typedef struct kwindow_platform_state {
	WindowDelegate *wnd_delegate;
	NSWindow *handle;
	ContentView *view;
	CAMetalLayer *layer;
	f32 device_pixel_ratio;
} kwindow_platform_state;

void vulkan_platform_get_required_extension_names (const char ***names_darray) {
	const char *ext = "VK_EXT_metal_surface";
	darray_push(*names_darray, &ext);
	// Required for macos
	ext = VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME;
	darray_push(*names_darray, &ext);
}

b8 vulkan_platform_create_vulkan_surface (vulkan_context *context, struct kwindow *window) {

	VkMetalSurfaceCreateInfoEXT create_info = {VK_STRUCTURE_TYPE_METAL_SURFACE_CREATE_INFO_EXT};
	create_info.pLayer = window->platform_state->layer;
	PFN_vkCreateMetalSurfaceEXT kvkCreateMetalSurfaceEXT = platform_dynamic_library_load_function("vkCreateMetalSurfaceEXT", &context->rhi.vulkan_lib);
	if (!kvkCreateMetalSurfaceEXT) {
		KERROR("Failed to load vkCreateMetalSurfaceEXT!");
		return false;
	}

	VkResult result = kvkCreateMetalSurfaceEXT(
		context->instance,
		&create_info,
		context->allocator,
		&window->renderer_state->backend_state->surface);
	if (result != VK_SUCCESS) {
		KFATAL("Vulkan surface creation failed.");
		return false;
	}

	return true;
}

b8 vulkan_platform_presentation_support (vulkan_context *context, VkPhysicalDevice physical_device, u32 queue_family_index) {
	// NOTE: According to the Vulkan spec this must always be supported for all devices.
	// https://registry.khronos.org/vulkan/specs/1.3-extensions/html/chap34.html#_querying_for_wsi_support
	// 34.4.10. macOS Platform
	// On macOS, all physical devices and queue families must be capable of presentation with any layer. As a result there is no macOS-specific query for these capabilities.
	return true;
}

b8 vulkan_platform_initialize (krhi_vulkan *rhi) {
	if (!rhi) {
		return false;
	}

	return platform_dynamic_library_load("vulkan.1", &rhi->vulkan_lib);
}

void vulkan_platform_shutdown (krhi_vulkan *rhi) {
	if (rhi) {
		platform_dynamic_library_unload(&rhi->vulkan_lib);
	}
}

#endif