#include <u.h>
#include <libc.h>
#include <thread.h>
#include <bio.h>
#include "ipc.h"

#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))

/*
 * plan9port runs the note handlers for a note it goes on to ignore, and
 * the process lives through it, so what strans announced must outlive
 * such a note.  A daemon that forks nothing gets only the one.
 */
#define notefatal(note) (strcmp(note, "sys: write on closed pipe") != 0)

/* A language id is the control code of the Ctrl key that selects it. */
enum
{
	LangEN	= 0x14,
	LangJP	= 0x0e,
	LangJPK	= 0x0b,
	LangKO	= 0x13,
	LangHANJA	= 0x08,
	LangEMOJI	= 0x05,
	LangVI	= 0x16,

	Maxrunes	= 64,
	Maxutf	= Maxrunes * UTFmax + 1,
};

enum
{
	Maxclients	= 64,
	Ownerpoll	= 200,	/* ms between a frontend's owner checks while its preedit shows */
	Maxkouho	= 128,
	Maxdisp		= 9,

	/* Content purposes whose keys the engine never sees; IBus and
	 * text-input-v3 number them alike, both after GTK. */
	Purposepassword	= 8,
	Purposepin	= 9,

	Colfg	= 0x000000,
	Colbg	= 0xffffff,
	Colsep	= 0xd0d0d0,
	Colsel	= 0x333333,
	Colselfg	= 0xffffff,
};

/* Each frontend composes on its own: they run in different procs. */
enum
{
	Composeibus,
	Composexim,
	Composewl,
	Ncompose,
};

/* Popup metrics in pixels; popupscale is GDK_SCALE, for HiDPI. */
extern int popupscale;
#define Fontsz		(32*popupscale)
#define PopupPad	(4*popupscale)
#define PopupSep	popupscale
#define PopupBorder	popupscale
#define PopupNumw	Fontsz
#define PopupTextw	(12*Fontsz)
#define PopupBasew	(2*PopupPad + PopupNumw + PopupTextw)

typedef struct Str Str;
struct Str
{
	Rune	r[Maxrunes];
	int	n;
};

/*
 * What one key does to a composition: text to commit, the new pending
 * text, and the new raw state (Telex key history, or pending Japanese
 * romaji), given the old ones in Im.
 */
typedef struct Emit Emit;
struct Emit
{
	int	eat;
	Str	s;
	Str	next;
	Str	raw;
};

typedef struct Tnode Tnode;
struct Tnode
{
	char	*val;
	int	vlen;
	int	child;
	int	sibling;
	Rune	c;
};

typedef struct Trie Trie;
struct Trie
{
	Tnode	*nodes;
	int	n;
	int	cap;
	/* the last key put and its path, so a sorted file walks it once */
	Str	last;
	int	path[Maxrunes];
};

enum
{
	TrieMiss,
	TriePrefix,
	TrieExact,
};

typedef struct Lang Lang;
typedef struct Im Im;
struct Lang
{
	int	lang;
	char	*mapname;
	char	*dictname;
	Emit	(*trans)(Im*, Rune);
	void	(*back)(Im*);
	Trie	*map;
	Trie	*dict;
};

struct Im
{
	Lang	*l;
	Str	pre;
	/* Telex history, or the short pending romaji in a Japanese mode. */
	Str	raw;
	Str	kouho[Maxkouho];
	int	nkouho;
	int	sel;
};

typedef struct Drawcmd Drawcmd;
typedef struct Caret Caret;
typedef struct Area Area;
struct Area
{
	int	x;
	int	y;
	int	w;
	int	h;
};

struct Caret
{
	int	valid;
	int	x;
	int	y;
	int	h;
};

struct Drawcmd
{
	Str	pre;
	Str	kouho[Maxdisp];
	int	nkouho;
	int	sel;
	int	first;
	int	total;
	Caret	caret;
};

/*
 * Popup geometry from popuplayout: n rows from row0 of the candidates,
 * each Fontsz tall; a section's y is -1 when it is absent.  Numbers
 * start at PopupPad, text at PopupPad+PopupNumw.
 */
typedef struct Popup Popup;
struct Popup
{
	int	w;
	int	h;
	int	n;
	int	row0;
	int	prey;
	int	sepy;
	int	rowsy;
	int	textw;
	int	marky;
	int	markx;
	int	markw;
	Str	mark;
	int	sely;
	int	selw;
};

typedef struct Keyreq Keyreq;
typedef struct Keyres Keyres;
enum
{
	Keypress,
	Keyreset,
	Keyrelease,
	Keycaret,
	Keycap,
};
struct Keyres
{
	int	eaten;	/* Keycap: the caller is the owner and clientpre took. */
	int	del;	/* runes of the client's own text to take back first */
	Str	commit;
	Str	preedit;
};

struct Keyreq
{
	void	*owner;	/* stable until the context's release is acknowledged */
	int	clientpre;	/* the client draws the preedit; the popup does not */
	int	op;
	u32int	ks;
	u32int	mod;
	Caret	caret;
	Str	surround;	/* the client's own text just before the cursor */
	Channel	*reply;
};

extern Lang langs[];
extern int nlang;
extern Channel *drawc;
extern Channel *keyc;