/*
 * Copyright © 2014-2015 David FORT <contact@hardening-consulting.com>
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 */

#ifndef UWAC_H_
#define UWAC_H_

#include <wayland-client.h>
#include <stdbool.h>

#if defined(__GNUC__) && (__GNUC__ >= 4)
#if defined(__cplusplus) && (__cplusplus >= 201703L)
#define UWAC_API [[gnu::visibility("default")]]
#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 202311L)
#define UWAC_API [[gnu::visibility("default")]]
#else
#define UWAC_API __attribute__((visibility("default")))
#endif
#else
#define UWAC_API
#endif

typedef struct uwac_position UwacPosition;
typedef struct uwac_size UwacSize;
typedef struct uwac_display UwacDisplay;
typedef struct uwac_output UwacOutput;
typedef struct uwac_window UwacWindow;
typedef struct uwac_seat UwacSeat;
typedef uint32_t UwacSeatId;

/** @brief error codes */
typedef enum
{
	UWAC_SUCCESS = 0,
	UWAC_ERROR_NOMEMORY,
	UWAC_ERROR_UNABLE_TO_CONNECT,
	UWAC_ERROR_INVALID_DISPLAY,
	UWAC_NOT_ENOUGH_RESOURCES,
	UWAC_TIMEDOUT,
	UWAC_NOT_FOUND,
	UWAC_ERROR_CLOSED,
	UWAC_ERROR_INTERNAL,

	UWAC_ERROR_LAST,
} UwacReturnCode;

/** @brief input modifiers */
enum
{
	UWAC_MOD_SHIFT_MASK = 0x01,
	UWAC_MOD_ALT_MASK = 0x02,
	UWAC_MOD_CONTROL_MASK = 0x04,
	UWAC_MOD_CAPS_MASK = 0x08,
	UWAC_MOD_NUM_MASK = 0x10,
};

/** @brief a position */
struct uwac_position
{
	int x;
	int y;
};

/** @brief a rectangle size measure */
struct uwac_size
{
	int width;
	int height;
};

/** @brief event types */
enum
{
	UWAC_EVENT_NEW_SEAT = 0,
	UWAC_EVENT_REMOVED_SEAT,
	UWAC_EVENT_NEW_OUTPUT,
	UWAC_EVENT_CONFIGURE,
	UWAC_EVENT_POINTER_ENTER,
	UWAC_EVENT_POINTER_LEAVE,
	UWAC_EVENT_POINTER_MOTION,
	UWAC_EVENT_POINTER_BUTTONS,
	UWAC_EVENT_POINTER_AXIS,
	UWAC_EVENT_KEYBOARD_ENTER,
	UWAC_EVENT_KEYBOARD_MODIFIERS,
	UWAC_EVENT_KEY,
	UWAC_EVENT_TOUCH_FRAME_BEGIN,
	UWAC_EVENT_TOUCH_UP,
	UWAC_EVENT_TOUCH_DOWN,
	UWAC_EVENT_TOUCH_MOTION,
	UWAC_EVENT_TOUCH_CANCEL,
	UWAC_EVENT_TOUCH_FRAME_END,
	UWAC_EVENT_FRAME_DONE,
	UWAC_EVENT_CLOSE,
	UWAC_EVENT_CLIPBOARD_AVAILABLE,
	UWAC_EVENT_CLIPBOARD_SELECT,
	UWAC_EVENT_CLIPBOARD_OFFER,
	UWAC_EVENT_OUTPUT_GEOMETRY,
	UWAC_EVENT_POINTER_AXIS_DISCRETE,
	UWAC_EVENT_POINTER_FRAME,
	UWAC_EVENT_POINTER_SOURCE
};

/** @brief window states */
enum
{
	UWAC_WINDOW_MAXIMIZED = 0x1,
	UWAC_WINDOW_RESIZING = 0x2,
	UWAC_WINDOW_FULLSCREEN = 0x4,
	UWAC_WINDOW_ACTIVATED = 0x8,
};

struct uwac_new_output_event
{
	int type;
	UwacOutput* output;
};
typedef struct uwac_new_output_event UwacOutputNewEvent;

struct uwac_new_seat_event
{
	int type;
	UwacSeat* seat;
};
typedef struct uwac_new_seat_event UwacSeatNewEvent;

struct uwac_removed_seat_event
{
	int type;
	UwacSeatId id;
};
typedef struct uwac_removed_seat_event UwacSeatRemovedEvent;

struct uwac_keyboard_enter_event
{
	int type;
	UwacWindow* window;
	UwacSeat* seat;
};
typedef struct uwac_keyboard_enter_event UwacKeyboardEnterLeaveEvent;

struct uwac_keyboard_modifiers_event
{
	int type;
	uint32_t modifiers;
};
typedef struct uwac_keyboard_modifiers_event UwacKeyboardModifiersEvent;

struct uwac_pointer_enter_event
{
	int type;
	UwacWindow* window;
	UwacSeat* seat;
	uint32_t x, y;
};
typedef struct uwac_pointer_enter_event UwacPointerEnterLeaveEvent;

struct uwac_pointer_motion_event
{
	int type;
	UwacWindow* window;
	UwacSeat* seat;
	uint32_t x, y;
};
typedef struct uwac_pointer_motion_event UwacPointerMotionEvent;

struct uwac_pointer_button_event
{
	int type;
	UwacWindow* window;
	UwacSeat* seat;
	uint32_t x, y;
	uint32_t button;
	enum wl_pointer_button_state state;
};
typedef struct uwac_pointer_button_event UwacPointerButtonEvent;

struct uwac_pointer_axis_event
{
	int type;
	UwacWindow* window;
	UwacSeat* seat;
	uint32_t x, y;
	uint32_t axis;
	wl_fixed_t value;
};
typedef struct uwac_pointer_axis_event UwacPointerAxisEvent;

struct uwac_pointer_frame_event
{
	int type;
	UwacWindow* window;
	UwacSeat* seat;
};
typedef struct uwac_pointer_frame_event UwacPointerFrameEvent;

struct uwac_pointer_source_event
{
	int type;
	UwacWindow* window;
	UwacSeat* seat;
	enum wl_pointer_axis_source axis_source;
};
typedef struct uwac_pointer_source_event UwacPointerSourceEvent;

struct uwac_touch_frame_event
{
	int type;
	UwacWindow* window;
	UwacSeat* seat;
};
typedef struct uwac_touch_frame_event UwacTouchFrameBegin;
typedef struct uwac_touch_frame_event UwacTouchFrameEnd;
typedef struct uwac_touch_frame_event UwacTouchCancel;

struct uwac_touch_data
{
	int type;
	UwacWindow* window;
	UwacSeat* seat;
	int32_t id;
	wl_fixed_t x;
	wl_fixed_t y;
};
typedef struct uwac_touch_data UwacTouchUp;
typedef struct uwac_touch_data UwacTouchDown;
typedef struct uwac_touch_data UwacTouchMotion;

struct uwac_frame_done_event
{
	int type;
	UwacWindow* window;
};
typedef struct uwac_frame_done_event UwacFrameDoneEvent;

struct uwac_configure_event
{
	int type;
	UwacWindow* window;
	int32_t width;
	int32_t height;
	int states;
};
typedef struct uwac_configure_event UwacConfigureEvent;

struct uwac_key_event
{
	int type;
	UwacWindow* window;
	uint32_t raw_key;
	uint32_t sym;
	bool pressed;
	bool repeated;
};
typedef struct uwac_key_event UwacKeyEvent;

struct uwac_close_event
{
	int type;
	UwacWindow* window;
};
typedef struct uwac_close_event UwacCloseEvent;

struct uwac_clipboard_event
{
	int type;
	UwacSeat* seat;
	char mime[64];
};
typedef struct uwac_clipboard_event UwacClipboardEvent;

struct uwac_output_geometry_event
{
	int type;
	UwacOutput* output;
	int x;
	int y;
	int physical_width;
	int physical_height;
	int subpixel;
	const char* make;
	const char* model;
	int transform;
};
typedef struct uwac_output_geometry_event UwacOutputGeometryEvent;

union uwac_event
{
	int type;
	UwacOutputNewEvent output_new;
	UwacOutputGeometryEvent output_geometry;
	UwacSeatNewEvent seat_new;
	UwacSeatRemovedEvent seat_removed;
	UwacPointerEnterLeaveEvent mouse_enter_leave;
	UwacPointerMotionEvent mouse_motion;
	UwacPointerButtonEvent mouse_button;
	UwacPointerAxisEvent mouse_axis;
	UwacPointerFrameEvent mouse_frame;
	UwacPointerSourceEvent mouse_source;
	UwacKeyboardEnterLeaveEvent keyboard_enter_leave;
	UwacKeyboardModifiersEvent keyboard_modifiers;
	UwacClipboardEvent clipboard;
	UwacKeyEvent key;
	UwacTouchFrameBegin touchFrameBegin;
	UwacTouchUp touchUp;
	UwacTouchDown touchDown;
	UwacTouchMotion touchMotion;
	UwacTouchFrameEnd touchFrameEnd;
	UwacTouchCancel touchCancel;
	UwacFrameDoneEvent frame_done;
	UwacConfigureEvent configure;
	UwacCloseEvent close;
};
typedef union uwac_event UwacEvent;

typedef bool (*UwacErrorHandler)(UwacDisplay* d, UwacReturnCode code, const char* msg, ...);
typedef void (*UwacDataTransferHandler)(UwacSeat* seat, void* context, const char* mime, int fd);
typedef void (*UwacCancelDataTransferHandler)(UwacSeat* seat, void* context);

#ifdef __cplusplus
extern "C"
{
#endif

	/**
	 *	install a handler that will be called when UWAC encounter internal errors. The
	 *	handler is supposed to answer if the execution can continue. I can also be used
	 *	to log things.
	 *
	 * @param handler the error handling function to install
	 */
	UWAC_API void UwacInstallErrorHandler(UwacErrorHandler handler);

	/**
	 *	Opens the corresponding wayland display, using nullptr you will open the default
	 *	display.
	 *
	 * @param name the name of the display to open
	 * @return the created UwacDisplay object
	 */
	UWAC_API UwacDisplay* UwacOpenDisplay(const char* name, UwacReturnCode* err);

	/**
	 *	closes the corresponding UwacDisplay
	 *
	 * @param pdisplay a pointer on the display to close
	 * @return UWAC_SUCCESS if the operation was successful, the corresponding error otherwise
	 */
	UWAC_API UwacReturnCode UwacCloseDisplay(UwacDisplay** pdisplay);

	/**
	 * Returns the file descriptor associated with the UwacDisplay, this is useful when
	 * you want to poll that file descriptor for activity.
	 *
	 * @param display an opened UwacDisplay
	 * @return the corresponding descriptor
	 */
	UWAC_API int UwacDisplayGetFd(UwacDisplay* display);

	/**
	 *	Returns a human readable form of a Uwac error code
	 *
	 * @param error the error number
	 * @return the associated string
	 */
	UWAC_API const char* UwacErrorString(UwacReturnCode error);

	/**
	 * returns the last error that occurred on a display
	 *
	 * @param display the display
	 * @return the last error that have been set for this display
	 */
	UWAC_API UwacReturnCode UwacDisplayGetLastError(const UwacDisplay* display);

	/**
	 * retrieves the version of a given interface
	 *
	 * @param display the display connection
	 * @param name the name of the interface
	 * @param version the output variable for the version
	 * @return UWAC_SUCCESS if the interface was found, UWAC_NOT_FOUND otherwise
	 */
	UWAC_API UwacReturnCode UwacDisplayQueryInterfaceVersion(const UwacDisplay* display,
	                                                         const char* name, uint32_t* version);

	/**
	 *	returns the number SHM formats that have been reported by the compositor
	 *
	 * @param display a connected UwacDisplay
	 * @return the number of SHM formats supported
	 */
	UWAC_API uint32_t UwacDisplayQueryGetNbShmFormats(UwacDisplay* display);

	/**
	 *	returns the supported ShmFormats
	 *
	 * @param display a connected UwacDisplay
	 * @param formats a pointer on an array of wl_shm_format with enough place for formats_size
	 *items
	 * @param formats_size the size of the formats array
	 * @param filled the number of filled entries in the formats array
	 * @return UWAC_SUCCESS on success, an error otherwise
	 */
	UWAC_API UwacReturnCode UwacDisplayQueryShmFormats(const UwacDisplay* display,
	                                                   enum wl_shm_format* formats,
	                                                   int formats_size, int* filled);

	/**
	 *	returns the number of registered outputs
	 *
	 * @param display the display to query
	 * @return the number of outputs
	 */
	UWAC_API uint32_t UwacDisplayGetNbOutputs(const UwacDisplay* display);

	/**
	 *	retrieve a particular UwacOutput object
	 *
	 * @param display the display to query
	 * @param index index of the output
	 * @return the given UwacOutput, nullptr if something failed (so you should query
	 *UwacDisplayGetLastError() to have the reason)
	 */
	UWAC_API const UwacOutput* UwacDisplayGetOutput(UwacDisplay* display, int index);

	/**
	 * retrieve the resolution of a given UwacOutput
	 *
	 * @param output the UwacOutput
	 * @param resolution a pointer on the
	 * @return UWAC_SUCCESS on success
	 */
	UWAC_API UwacReturnCode UwacOutputGetResolution(const UwacOutput* output, UwacSize* resolution);

	/**
	 * retrieve the position of a given UwacOutput
	 *
	 * @param output the UwacOutput
	 * @param pos a pointer on the target position
	 * @return UWAC_SUCCESS on success
	 */
	UWAC_API UwacReturnCode UwacOutputGetPosition(const UwacOutput* output, UwacPosition* pos);

	/**
	 *	creates a window using a SHM surface
	 *
	 * @param display the display to attach the window to
	 * @param width the width of the window
	 * @param height the height of the window
	 * @param format format to use for the SHM surface
	 * @return the created UwacWindow, nullptr if something failed (use UwacDisplayGetLastError() to
	 *know more about this)
	 */
	UWAC_API UwacWindow* UwacCreateWindowShm(UwacDisplay* display, uint32_t width, uint32_t height,
	                                         enum wl_shm_format format);

	/**
	 *	destroys the corresponding UwacWindow
	 *
	 * @param window a pointer on the UwacWindow to destroy
	 * @return if the operation completed successfully
	 */
	UWAC_API UwacReturnCode UwacDestroyWindow(UwacWindow** window);

	/**
	 *	Sets the region that should be considered opaque to the compositor.
	 *
	 * @param window the UwacWindow
	 * @param x The horizontal coordinate in pixels
	 * @param y The vertical coordinate in pixels
	 * @param width The width of the region
	 * @param height The height of the region
	 * @return UWAC_SUCCESS on success, an error otherwise
	 */
	UWAC_API UwacReturnCode UwacWindowSetOpaqueRegion(UwacWindow* window, uint32_t x, uint32_t y,
	                                                  uint32_t width, uint32_t height);

	/**
	 *	Sets the region of the window that can trigger input events
	 *
	 * @param window the UwacWindow
	 * @param x The horizontal coordinate in pixels
	 * @param y The vertical coordinate in pixels
	 * @param width The width of the region
	 * @param height The height of the region
	 * @return UWAC_SUCCESS on success, an error otherwise
	 */
	UWAC_API UwacReturnCode UwacWindowSetInputRegion(UwacWindow* window, uint32_t x, uint32_t y,
	                                                 uint32_t width, uint32_t height);

	/**
	 *	retrieves a pointer on the current window content to draw a frame
	 * @param window the UwacWindow
	 * @return a pointer on the current window content
	 */
	UWAC_API void* UwacWindowGetDrawingBuffer(UwacWindow* window);

	/**
	 *	sets a rectangle as dirty for the next frame of a window
	 *
	 * @param window the UwacWindow
	 * @param x left coordinate
	 * @param y top coordinate
	 * @param width the width of the dirty rectangle
	 * @param height the height of the dirty rectangle
	 * @return UWAC_SUCCESS on success, an Uwac error otherwise
	 */
	UWAC_API UwacReturnCode UwacWindowAddDamage(UwacWindow* window, uint32_t x, uint32_t y,
	                                            uint32_t width, uint32_t height);

	/**
	 *	returns the geometry of the given UwacWindow buffer
	 *
	 * @param window   the UwacWindow
	 * @param geometry the geometry to fill
	 * @param stride   the length of a buffer line in bytes
	 * @return UWAC_SUCCESS on success, an Uwac error otherwise
	 */
	UWAC_API UwacReturnCode UwacWindowGetDrawingBufferGeometry(UwacWindow* window,
	                                                           UwacSize* geometry, size_t* stride);

	/**
	 *	Sends a frame to the compositor with the content of the drawing buffer
	 *
	 * @param window the UwacWindow to refresh
	 * @param copyContentForNextFrame if true the content to display is copied in the next drawing
	 *buffer
	 * @return UWAC_SUCCESS if the operation was successful
	 */
	UWAC_API UwacReturnCode UwacWindowSubmitBuffer(UwacWindow* window,
	                                               bool copyContentForNextFrame);

	/**
	 *	returns the geometry of the given UwacWindows
	 *
	 * @param window the UwacWindow
	 * @param geometry the geometry to fill
	 * @return UWAC_SUCCESS on success, an Uwac error otherwise
	 */
	UWAC_API UwacReturnCode UwacWindowGetGeometry(UwacWindow* window, UwacSize* geometry);

	/**
	 *	Sets or unset the fact that the window is set fullscreen. After this call the
	 *	application should get prepared to receive a configure event. The output is used
	 *	only when going fullscreen, it is optional and not used when exiting fullscreen.
	 *
	 * @param window the UwacWindow
	 * @param output an optional UwacOutput to put the window fullscreen on
	 * @param isFullscreen set or unset fullscreen
	 * @return UWAC_SUCCESS if the operation was a success
	 */
	UWAC_API UwacReturnCode UwacWindowSetFullscreenState(UwacWindow* window, UwacOutput* output,
	                                                     bool isFullscreen);

	/**
	 *	When possible (depending on the shell) sets the title of the UwacWindow
	 *
	 * @param window the UwacWindow
	 * @param name title
	 */
	UWAC_API void UwacWindowSetTitle(UwacWindow* window, const char* name);

	/**
	 *	Sets the app id of the UwacWindow
	 *
	 * @param window the UwacWindow
	 * @param app_id app id
	 */
	UWAC_API void UwacWindowSetAppId(UwacWindow* window, const char* app_id);

	/** Dispatch the display
	 *
	 * @param display The display to dispatch
	 * @param timeout The maximum time to wait in milliseconds (-1 == infinite).
	 * @return 1 for success, 0 if display not running, -1 on failure
	 */
	UWAC_API int UwacDisplayDispatch(UwacDisplay* display, int timeout);

	/**
	 *	Returns if you have some pending events, and you can UwacNextEvent() without blocking
	 *
	 * @param display the UwacDisplay
	 * @return if there's some pending events
	 */
	UWAC_API bool UwacHasEvent(UwacDisplay* display);

	/** Waits until an event occurs, and when it's there copy the event from the queue to
	 * event.
	 *
	 * @param display the Uwac display
	 * @param event the event to fill
	 * @return if the operation completed successfully
	 */
	UWAC_API UwacReturnCode UwacNextEvent(UwacDisplay* display, UwacEvent* event);

	/**
	 * returns the name of the given UwacSeat
	 *
	 * @param seat the UwacSeat
	 * @return the name of the seat
	 */
	UWAC_API const char* UwacSeatGetName(const UwacSeat* seat);

	/**
	 * returns the id of the given UwacSeat
	 *
	 * @param seat the UwacSeat
	 * @return the id of the seat
	 */
	UWAC_API UwacSeatId UwacSeatGetId(const UwacSeat* seat);

	/**
	 *
	 */
	UWAC_API UwacReturnCode UwacClipboardOfferDestroy(UwacSeat* seat);
	UWAC_API UwacReturnCode UwacClipboardOfferCreate(UwacSeat* seat, const char* mime);
	UWAC_API UwacReturnCode UwacClipboardOfferAnnounce(UwacSeat* seat, void* context,
	                                                   UwacDataTransferHandler transfer,
	                                                   UwacCancelDataTransferHandler cancel);
	UWAC_API void* UwacClipboardDataGet(UwacSeat* seat, const char* mime, size_t* size);

	/**
	 * Inhibits or restores keyboard shortcuts.
	 *
	 * @param seat    The UwacSeat to inhibit the shortcuts for
	 * @param inhibit Inhibit or restore keyboard shortcuts
	 *
	 * @return UWAC_SUCCESS or an appropriate error code.
	 */
	UWAC_API UwacReturnCode UwacSeatInhibitShortcuts(UwacSeat* seat, bool inhibit);

	/**
	 * @brief UwacSeatSetMouseCursor Sets the specified image as the new mouse cursor.
	 *                               Special values: If data == nullptr && length == 0
	 *                               the cursor is hidden, if data == nullptr && length != 0
	 *                               the default system cursor is used.
	 *
	 * @param seat   The UwacSeat to apply the cursor image to
	 * @param data   A pointer to the image data
	 * @param length The size of the image data
	 * @param width  The image width in pixel
	 * @param height The image height in pixel
	 * @param hot_x  The hotspot horizontal offset in pixel
	 * @param hot_y  The hotspot vertical offset in pixel
	 *
	 * @return UWAC_SUCCESS if successful, an appropriate error otherwise.
	 */
	UWAC_API UwacReturnCode UwacSeatSetMouseCursor(UwacSeat* seat, const void* data, size_t length,
	                                               size_t width, size_t height, size_t hot_x,
	                                               size_t hot_y);

#ifdef __cplusplus
}
#endif

#endif /* UWAC_H_ */
