#ifndef TERMKEY2_H
#define TERMKEY2_H

#include <stdint.h>
#include <stdlib.h>
#include <limits.h>

#include "termkey2-config.h"

#define TERMKEY_CHECK_VERSION \
	termkey_check_version (TERMKEY_VERSION_MAJOR, TERMKEY_VERSION_MINOR)

typedef enum termkey_sym termkey_sym_t;
enum termkey_sym
{
	TERMKEY_SYM_UNKNOWN = -1,
	TERMKEY_SYM_NONE = 0,

	/* Special names in C0 */
	TERMKEY_SYM_BACKSPACE,
	TERMKEY_SYM_TAB,
	TERMKEY_SYM_ENTER,
	TERMKEY_SYM_ESCAPE,

	/* Special names in G0 */
	TERMKEY_SYM_SPACE,
	TERMKEY_SYM_DEL,

	/* Special keys */
	TERMKEY_SYM_UP,
	TERMKEY_SYM_DOWN,
	TERMKEY_SYM_LEFT,
	TERMKEY_SYM_RIGHT,
	TERMKEY_SYM_BEGIN,
	TERMKEY_SYM_FIND,
	TERMKEY_SYM_INSERT,
	TERMKEY_SYM_DELETE,
	TERMKEY_SYM_SELECT,
	TERMKEY_SYM_PAGEUP,
	TERMKEY_SYM_PAGEDOWN,
	TERMKEY_SYM_HOME,
	TERMKEY_SYM_END,

	/* Special keys from terminfo */
	TERMKEY_SYM_CANCEL,
	TERMKEY_SYM_CLEAR,
	TERMKEY_SYM_CLOSE,
	TERMKEY_SYM_COMMAND,
	TERMKEY_SYM_COPY,
	TERMKEY_SYM_EXIT,
	TERMKEY_SYM_HELP,
	TERMKEY_SYM_MARK,
	TERMKEY_SYM_MESSAGE,
	TERMKEY_SYM_MOVE,
	TERMKEY_SYM_OPEN,
	TERMKEY_SYM_OPTIONS,
	TERMKEY_SYM_PRINT,
	TERMKEY_SYM_REDO,
	TERMKEY_SYM_REFERENCE,
	TERMKEY_SYM_REFRESH,
	TERMKEY_SYM_REPLACE,
	TERMKEY_SYM_RESTART,
	TERMKEY_SYM_RESUME,
	TERMKEY_SYM_SAVE,
	TERMKEY_SYM_SUSPEND,
	TERMKEY_SYM_UNDO,

	/* Numeric keypad special keys */
	TERMKEY_SYM_KP0,
	TERMKEY_SYM_KP1,
	TERMKEY_SYM_KP2,
	TERMKEY_SYM_KP3,
	TERMKEY_SYM_KP4,
	TERMKEY_SYM_KP5,
	TERMKEY_SYM_KP6,
	TERMKEY_SYM_KP7,
	TERMKEY_SYM_KP8,
	TERMKEY_SYM_KP9,
	TERMKEY_SYM_KPENTER,
	TERMKEY_SYM_KPPLUS,
	TERMKEY_SYM_KPMINUS,
	TERMKEY_SYM_KPMULT,
	TERMKEY_SYM_KPDIV,
	TERMKEY_SYM_KPCOMMA,
	TERMKEY_SYM_KPPERIOD,
	TERMKEY_SYM_KPEQUALS,

	TERMKEY_N_SYMS
};

typedef enum termkey_type termkey_type_t;
enum termkey_type
{
	TERMKEY_TYPE_KEY,
	TERMKEY_TYPE_FUNCTION,
	TERMKEY_TYPE_KEYSYM,
	TERMKEY_TYPE_MOUSE,
	TERMKEY_TYPE_POSITION,
	TERMKEY_TYPE_MODEREPORT,
	/* add other recognised types here */

	TERMKEY_TYPE_UNKNOWN_CSI = -1
};

typedef enum termkey_result termkey_result_t;
enum termkey_result
{
	TERMKEY_RES_NONE,
	TERMKEY_RES_KEY,
	TERMKEY_RES_EOF,
	TERMKEY_RES_AGAIN,
	TERMKEY_RES_ERROR
};

typedef enum termkey_mouse_event termkey_mouse_event_t;
enum termkey_mouse_event
{
	TERMKEY_MOUSE_UNKNOWN,
	TERMKEY_MOUSE_PRESS,
	TERMKEY_MOUSE_DRAG,
	TERMKEY_MOUSE_RELEASE
};

enum
{
	TERMKEY_KEYMOD_SHIFT = 1 << 0,
	TERMKEY_KEYMOD_ALT   = 1 << 1,
	TERMKEY_KEYMOD_CTRL  = 1 << 2
};

typedef struct termkey_key termkey_key_t;
struct termkey_key
{
	termkey_type_t type;
	union
	{
		uint32_t      codepoint; /* TERMKEY_TYPE_KEY */
		int           number;    /* TERMKEY_TYPE_FUNCTION */
		termkey_sym_t sym;       /* TERMKEY_TYPE_KEYSYM */
		char          mouse[4];  /* TERMKEY_TYPE_MOUSE */
								 /* opaque, see termkey_interpret_mouse() */
	} code;

	int modifiers;

	/* The raw multibyte sequence for the key */
	char multibyte[MB_LEN_MAX + 1];
};

typedef struct termkey termkey_t;

enum
{
	/* Do not interpret C0//DEL codes if possible */
	TERMKEY_FLAG_NOINTERPRET = 1 << 0,
	/* Convert KP codes to regular keypresses */
	TERMKEY_FLAG_CONVERTKP   = 1 << 1,
	/* Don't try to decode the input characters */
	TERMKEY_FLAG_RAW         = 1 << 2,
	/* Do not make initial termios calls on construction */
	TERMKEY_FLAG_NOTERMIOS   = 1 << 4,
	/* Sets TERMKEY_CANON_SPACESYMBOL */
	TERMKEY_FLAG_SPACESYMBOL = 1 << 5,
	/* Allow Ctrl-C to be read as normal, disabling SIGINT */
	TERMKEY_FLAG_CTRLC       = 1 << 6,
	/* Return ERROR on signal (EINTR) rather than retry */
	TERMKEY_FLAG_EINTR       = 1 << 7
};

enum
{
	TERMKEY_CANON_SPACESYMBOL = 1 << 0, /* Space is symbolic rather than Unicode */
	TERMKEY_CANON_DELBS       = 1 << 1  /* Del is converted to Backspace */
};

void termkey_check_version (int major, int minor);

termkey_t *termkey_new (int fd, const char *encoding, int flags);
termkey_t *termkey_new_abstract (const char *term,
	const char *encoding, int flags);
void termkey_free (termkey_t *tk);
void termkey_destroy (termkey_t *tk);

int termkey_start (termkey_t *tk);
int termkey_stop (termkey_t *tk);
int termkey_is_started (termkey_t *tk);

int termkey_get_fd (termkey_t *tk);

int termkey_get_flags (termkey_t *tk);
void termkey_set_flags (termkey_t *tk, int newflags);

int termkey_get_waittime (termkey_t *tk);
void termkey_set_waittime (termkey_t *tk, int msec);

int termkey_get_canonflags (termkey_t *tk);
void termkey_set_canonflags (termkey_t *tk, int flags);

size_t termkey_get_buffer_size (termkey_t *tk);
int termkey_set_buffer_size (termkey_t *tk, size_t size);

size_t termkey_get_buffer_remaining (termkey_t *tk);

void termkey_canonicalise (termkey_t *tk, termkey_key_t *key);

termkey_result_t termkey_getkey (termkey_t *tk, termkey_key_t *key);
termkey_result_t termkey_getkey_force (termkey_t *tk, termkey_key_t *key);
termkey_result_t termkey_waitkey (termkey_t *tk, termkey_key_t *key);

termkey_result_t termkey_advisereadable (termkey_t *tk);

size_t termkey_push_bytes (termkey_t *tk, const char *bytes, size_t len);

termkey_sym_t termkey_register_keyname (termkey_t *tk,
	termkey_sym_t sym, const char *name);
const char *termkey_get_keyname (termkey_t *tk, termkey_sym_t sym);
const char *termkey_lookup_keyname (termkey_t *tk,
	const char *str, termkey_sym_t *sym);

termkey_sym_t termkey_keyname2sym (termkey_t *tk, const char *keyname);

termkey_result_t termkey_interpret_mouse (termkey_t *tk,
	const termkey_key_t *key, termkey_mouse_event_t *event,
	int *button, int *line, int *col);
termkey_result_t termkey_interpret_position (termkey_t *tk,
	const termkey_key_t *key, int *line, int *col);
termkey_result_t termkey_interpret_modereport (termkey_t *tk,
	const termkey_key_t *key, int *initial, int *mode, int *value);
termkey_result_t termkey_interpret_csi (termkey_t *tk,
	const termkey_key_t *key, long args[], size_t *nargs, unsigned long *cmd);

typedef enum termkey_format termkey_format_t;
enum termkey_format
{
	/* Shift-... instead of S-... */
	TERMKEY_FORMAT_LONGMOD     = 1 << 0,
	/* ^X instead of C-X */
	TERMKEY_FORMAT_CARETCTRL   = 1 << 1,
	/* Meta- or M- instead of Alt- or A- */
	TERMKEY_FORMAT_ALTISMETA   = 1 << 2,
	/* Wrap special keys in brackets like <Escape> */
	TERMKEY_FORMAT_WRAPBRACKET = 1 << 3,
	/* M Foo instead of M-Foo */
	TERMKEY_FORMAT_SPACEMOD    = 1 << 4,
	/* meta or m instead of Meta or M */
	TERMKEY_FORMAT_LOWERMOD    = 1 << 5,
	/* page down instead of PageDown */
	TERMKEY_FORMAT_LOWERSPACE  = 1 << 6,
	/* Include mouse position if relevant; @ col,line */
	TERMKEY_FORMAT_MOUSE_POS   = 1 << 8
};

/* Some useful combinations */

#define TERMKEY_FORMAT_VIM (termkey_format_t) \
	(TERMKEY_FORMAT_ALTISMETA | TERMKEY_FORMAT_WRAPBRACKET)
#define TERMKEY_FORMAT_URWID (termkey_format_t) \
	(TERMKEY_FORMAT_LONGMOD | TERMKEY_FORMAT_ALTISMETA | \
	 TERMKEY_FORMAT_LOWERMOD | TERMKEY_FORMAT_SPACEMOD | \
	 TERMKEY_FORMAT_LOWERSPACE)

size_t termkey_strfkey (termkey_t *tk, char *buffer, size_t len,
	termkey_key_t *key, termkey_format_t format);
const char *termkey_strpkey (termkey_t *tk, const char *str,
	termkey_key_t *key, termkey_format_t format);

int termkey_keycmp (termkey_t *tk,
	const termkey_key_t *key1, const termkey_key_t *key2);

#endif  // ! TERMKEY2_H