#pragma once
#include <inttypes.h>
#include <blah/core/filesystem.h>
#include <blah/containers/vector.h>

namespace Blah
{
	struct Config;
	enum class FileMode;

	namespace PlatformBackend
	{
		typedef void* FileHandle;

		// Initialize the System
		bool init(const Config* config);

		// Called after the on_startup callback, but before the update loop begins
		void ready();

		// Called during shutdown
		void shutdown();

		// The time, in ticks (microseconds) since the Application was started
		uint64_t ticks();

		// Called every frame
		void frame();

		// Sleeps the current thread
		void sleep(int milliseconds);

		// Called to present the window contents
		void present();

		// Gets the Application Window Title in UTF-8
		const char* get_title();

		// Sets the Application Window Title in UTF-8
		void set_title(const char* title);

		// Gets the Application Window Position, in Screen Coordinates
		void get_position(int* x, int* y);

		// Sets the Application Window Position, in Screen Coordinates
		void set_position(int x, int y);

		// Sets the Window Fullscreen if enabled is not 0
		void set_fullscreen(bool enabled);

		// Gets the Application Window Size, in Screen Coordinates
		void get_size(int* width, int* height);

		// Sets the Application Window Size, in Screen Coordinates
		void set_size(int width, int height);

		// Gets the Application Window Drawing Size, in Pixels. This may differ from the Window Size on hi-dpi displays.
		void get_draw_size(int* width, int* height);

		// Gets the Desktop Content Scale. Gui should be scaled by this value
		float get_content_scale();

		// Returns the absoluate path to the directory that the application was started from
		const char* app_path();

		// Returns the absolute path to the user directory where save data and settings should be stored
		const char* user_path();

		// Returns true if a file with the given path exists
		bool file_exists(const char* path);

		// Returns true if a file with the given path was deleted
		bool file_delete(const char* path);

		// Returns true if a directory with the given path was successfully created
		bool dir_create(const char* path);

		// Returns true if a directory with the given path exists
		bool dir_exists(const char* path);

		// Returns true if a directory with the given path was deleted
		bool dir_delete(const char* path);

		// enumerates a directory and appends each file to the given list
		void dir_enumerate(Vector<FilePath>& list, const char* path, bool recursive);

		// opens a directory in the OS file explorer / finder
		void dir_explore(const char* path);

		// Opens a file and sets the handle. returns true if the file was successfully opened
		bool file_open(const char* path, FileHandle* handle, FileMode mode);

		// Returns the length of the file
		int64_t file_length(FileHandle file);

		// Returns the Position of the file
		int64_t file_position(FileHandle file);

		// Seeks the Position of the file and returns the new position from the start of the file
		int64_t file_seek(FileHandle file, int64_t seekTo);

		// Reads a specific number of elements of a given size from the file into ptr
		int64_t file_read(FileHandle file, void* ptr, int64_t size);

		// Writes a specific number of elements of the given size from ptr to the file
		int64_t file_write(FileHandle file, const void* ptr, int64_t size);

		// Closes a file
		void file_close(FileHandle file);

		// OpenGL Methods
		void* gl_get_func(const char* name);
		void* gl_context_create();
		void gl_context_make_current(void* context);
		void gl_context_destroy(void* context);

		// D3D11 Methods
		void* d3d11_get_hwnd();
	}
}