#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))

/* 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,

	Fontsz	= 32,
	PopupPad	= 4,
	PopupSep	= 1,
	PopupNumw	= Fontsz,
	PopupTextw	= 12*Fontsz,
	PopupBasew	= 2*PopupPad + PopupNumw + PopupTextw,
	Maxrunes	= 64,
	Maxutf	= Maxrunes * UTFmax + 1,
};

enum
{
	Maxclients	= 64,
	Maxkouho	= 32,
	Maxdisp		= 9,
	Imgh		= 2*PopupPad + (Maxdisp + 2)*Fontsz + PopupSep,

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

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;
	char	c;
};

typedef struct Trie Trie;
struct Trie
{
	Tnode	*nodes;
	int	n;
	int	cap;
};

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;
};

typedef struct Popup Popup;
struct Popup
{
	int	w;
	int	h;
	int	n;
	int	row0;
	int	prey;
	int	sepy;
	int	rowsy;
	int	numx;
	int	textx;
	int	textw;
	int	markx;
	int	marky;
	int	markw;
	int	selx;
	int	sely;
	int	selw;
};

typedef struct Keyreq Keyreq;
typedef struct Keyres Keyres;
enum
{
	Cclientpreedit	= 1<<0,
};
enum
{
	Keypress,
	Keyreset,
	Keyrelease,
	Keycaret,
	Keycap,
};
struct Keyres
{
	int	eaten;	/* Keycap: caller is active and capability was applied. */
	Str	commit;
	Str	preedit;
};

struct Keyreq
{
	void	*owner;	/* stable until the context's release is acknowledged */
	int	cap;
	int	op;
	u32int	ks;
	u32int	mod;
	Caret	caret;
	Channel	*reply;
};

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