/*
PuTTY is copyright 1997-2004 Simon Tatham.

Portions copyright Robert de Bath, Joris van Rantwijk, Delian
Delchev, Andreas Schultz, Jeroen Massar, Wez Furlong, Nicolas Barry,
Justin Bradford, Ben Harris, and CORE SDI S.A.

Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE
FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

/*
 * Internals of the Terminal structure, for those other modules
 * which need to look inside it. It would be nice if this could be
 * folded back into terminal.c in future, with an abstraction layer
 * to handle everything that other modules need to know about it;
 * but for the moment, this will do.
 */

#ifndef PUTTY_TERMINAL_H
#define PUTTY_TERMINAL_H

#include "tree234.h"

struct beeptime {
    struct beeptime *next;
    unsigned long ticks;
};

typedef struct {
    int y, x;
} pos;

#ifdef OPTIMISE_SCROLL
struct scrollregion {
    struct scrollregion *next;
    int topline; /* Top line of scroll region. */
    int botline; /* Bottom line of scroll region. */
    int lines; /* Number of lines to scroll by - +ve is forwards. */
};
#endif /* OPTIMISE_SCROLL */

struct terminal_tag {

    int compatibility_level;

    tree234 *scrollback;	       /* lines scrolled off top of screen */
    tree234 *screen;		       /* lines on primary screen */
    tree234 *alt_screen;	       /* lines on alternate screen */
    int disptop;		       /* distance scrolled back (0 or -ve) */
    int tempsblines;		       /* number of lines in temporary
					  scrollback */

    unsigned long *cpos;	       /* cursor position (convenience) */

    unsigned long *disptext;	       /* buffer of text on real screen */
    unsigned long *dispcurs;	       /* location of cursor on real screen */
    unsigned long curstype;	       /* type of cursor on real screen */

#define VBELL_TIMEOUT (TICKSPERSEC/10) /* visual bell lasts 1/10 sec */

    struct beeptime *beephead, *beeptail;
    int nbeeps;
    int beep_overloaded;
    long lastbeep;

#define TTYPE unsigned long
#define TSIZE (sizeof(TTYPE))
#define fix_cpos do { \
    term->cpos = lineptr(term->curs.y) + term->curs.x; \
} while(0)

#ifdef OPTIMISE_SCROLL
    struct scrollregion *scrollhead, *scrolltail;
#endif /* OPTIMISE_SCROLL */

    unsigned long default_attr, curr_attr, save_attr;
    unsigned long erase_char;

    bufchain inbuf;		       /* terminal input buffer */
    pos curs;			       /* cursor */
    pos savecurs;		       /* saved cursor position */
    int marg_t, marg_b;		       /* scroll margins */
    int dec_om;			       /* DEC origin mode flag */
    int wrap, wrapnext;		       /* wrap flags */
    int insert;			       /* insert-mode flag */
    int cset;			       /* 0 or 1: which char set */
    int save_cset, save_csattr;	       /* saved with cursor position */
    int save_utf, save_wnext;	       /* saved with cursor position */
    int rvideo;			       /* global reverse video flag */
    unsigned long rvbell_startpoint;   /* for ESC[?5hESC[?5l vbell */
    int cursor_on;		       /* cursor enabled flag */
    int reset_132;		       /* Flag ESC c resets to 80 cols */
    int use_bce;		       /* Use Background coloured erase */
    int blinker;		       /* When blinking is the cursor on ? */
    int tblinker;		       /* When the blinking text is on */
    int blink_is_real;		       /* Actually blink blinking text */
    int term_echoing;		       /* Does terminal want local echo? */
    int term_editing;		       /* Does terminal want local edit? */
    int sco_acs, save_sco_acs;	       /* CSI 10,11,12m -> OEM charset */
    int vt52_bold;		       /* Force bold on non-bold colours */
    int utf;			       /* Are we in toggleable UTF-8 mode? */
    int utf_state;		       /* Is there a pending UTF-8 character */
    uint32_t utf_char;		       /* and what is it so far. */
    int utf_size;		       /* The size of the UTF character. */
    int printing, only_printing;       /* Are we doing ANSI printing? */
    int print_state;		       /* state of print-end-sequence scan */
    bufchain printer_buf;	       /* buffered data for printer */
    printer_job *print_job;

    int rows, cols, savelines;
    int has_focus;
    int in_vbell;
    unsigned long vbell_startpoint;
    int app_cursor_keys, app_keypad_keys, vt52_mode;
    int repeat_off, cr_lf_return;
    int seen_disp_event;
    int big_cursor;

    long last_blink;		       /* used for real blinking control */
    long last_tblink;

    int xterm_mouse;		       /* send mouse messages to app */
    int mouse_is_down;		       /* used while tracking mouse buttons */

    unsigned long cset_attr[2];

/*
 * Saved settings on the alternate screen.
 */
    int alt_x, alt_y, alt_om, alt_wrap, alt_wnext, alt_ins;
    int alt_cset, alt_sco_acs, alt_utf;
    int alt_t, alt_b;
    int alt_which;
    int alt_sblines; /* # of lines on alternate screen that should be used for scrollback. */

#define ARGS_MAX 32		       /* max # of esc sequence arguments */
#define ARG_DEFAULT 0		       /* if an arg isn't specified */
#define def(a,d) ( (a) == ARG_DEFAULT ? (d) : (a) )
    int esc_args[ARGS_MAX];
    int esc_nargs;
    int esc_query;
#define ANSI(x,y)	((x)+((y)<<8))
#define ANSI_QUE(x)	ANSI(x,TRUE)

#define OSC_STR_MAX 2048
    int osc_strlen;
    char osc_string[OSC_STR_MAX + 1];
    int osc_w;

    char id_string[1024];

    unsigned char *tabs;

    enum {
	TOPLEVEL,
	SEEN_ESC,
	SEEN_CSI,
	SEEN_OSC,
	SEEN_OSC_W,

	DO_CTRLS,

	SEEN_OSC_P,
	OSC_STRING, OSC_MAYBE_ST,
	VT52_ESC,
	VT52_Y1,
	VT52_Y2,
	VT52_FG,
	VT52_BG
    } termstate;

    enum {
	NO_SELECTION, ABOUT_TO, DRAGGING, SELECTED
    } selstate;
    enum {
	LEXICOGRAPHIC, RECTANGULAR
    } seltype;
    enum {
	SM_CHAR, SM_WORD, SM_LINE
    } selmode;
    pos selstart, selend, selanchor;

    short wordness[256];

    /* Mask of attributes to pay attention to when painting. */
    unsigned long attr_mask;

    wchar_t *paste_buffer;
    int paste_len, paste_pos, paste_hold;
    long last_paste;

    void (*resize_fn)(void *, int, int);
    void *resize_ctx;

    void *ldisc;

    void *frontend;

    void *logctx;

    struct unicode_data *ucsdata;

    /*
     * We maintain a full _copy_ of a Config structure here, not
     * merely a pointer to it. That way, when we're passed a new
     * one for reconfiguration, we can check the differences and
     * adjust the _current_ setting of (e.g.) auto wrap mode rather
     * than only the default.
     */
    Config cfg;

    /*
     * from_backend calls term_out, but it can also be called from
     * the ldisc if the ldisc is called _within_ term_out. So we
     * have to guard against re-entrancy - if from_backend is
     * called recursively like this, it will simply add data to the
     * end of the buffer term_out is in the process of working
     * through.
     */
    int in_term_out;
};

#define in_utf(term) ((term)->utf || (term)->ucsdata->line_codepage==CP_UTF8)

#endif
