/* Copyright (c) 1997-1999 Miller Puckette.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */

/* changes by Thomas Musil IEM KUG Graz Austria 2001 */
/* have to insert gui-objects into editor-list */
/* all changes are labeled with      iemlib      */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include "m_pd.h"
#include "s_stuff.h"
#include "g_canvas.h"
#include "s_utf8.h"


#define LMARGIN 2
#define RMARGIN 2
/* for some reason, it draws text 1 pixel lower on Mac OS X (& linux too?) */
#ifndef MSW
#define TMARGIN 2
#define BMARGIN 2
#else
#define TMARGIN 3
#define BMARGIN 1
#endif

#define SEND_FIRST 1
#define SEND_UPDATE 2
#define SEND_CHECK 0

struct _rtext
{
    char *x_buf;    /*-- raw byte string, assumed UTF-8 encoded (moo) --*/
    int x_bufsize;  /*-- byte length --*/
    int x_selstart; /*-- byte offset --*/
    int x_selend;   /*-- byte offset --*/
    int x_active;
    int x_dragfrom;
    int x_height;
    int x_drawnwidth;
    int x_drawnheight;
    t_text *x_text;
    t_glist *x_glist;
    char x_tag[50];
    struct _rtext *x_next;
};

t_rtext *rtext_new(t_glist *glist, t_text *who)
{
    t_rtext *x = (t_rtext *)getbytes(sizeof *x);
    int w = 0, h = 0, indx;
    x->x_height = -1;
    x->x_text = who;
    x->x_glist = glist;
    x->x_next = glist->gl_editor->e_rtext;
    x->x_selstart = x->x_selend = x->x_active =
        x->x_drawnwidth = x->x_drawnheight = 0;
    binbuf_gettext(who->te_binbuf, &x->x_buf, &x->x_bufsize);
    glist->gl_editor->e_rtext = x;
    sprintf(x->x_tag, ".x%lx.t%lx", (t_int)glist_getcanvas(x->x_glist),
        (t_int)x);
    return (x);
}

static t_rtext *rtext_entered;

void rtext_free(t_rtext *x)
{
    if (x->x_glist->gl_editor->e_textedfor == x)
        x->x_glist->gl_editor->e_textedfor = 0;
    if (x->x_glist->gl_editor->e_rtext == x)
        x->x_glist->gl_editor->e_rtext = x->x_next;
    else
    {
        t_rtext *e2;
        for (e2 = x->x_glist->gl_editor->e_rtext; e2; e2 = e2->x_next)
            if (e2->x_next == x)
        {
            e2->x_next = x->x_next;
            break;
        }
    }
    if (rtext_entered == x) rtext_entered = 0;
    freebytes(x->x_buf, x->x_bufsize);
    freebytes(x, sizeof *x);
}

char *rtext_gettag(t_rtext *x)
{
    return (x->x_tag);
}

void rtext_gettext(t_rtext *x, char **buf, int *bufsize)
{
    *buf = x->x_buf;
    *bufsize = x->x_bufsize;
}

void rtext_getseltext(t_rtext *x, char **buf, int *bufsize)
{
    *buf = x->x_buf + x->x_selstart;
    *bufsize = x->x_selend - x->x_selstart;
}

/* convert t_text te_type symbol for use as a Tk tag */
static t_symbol *rtext_gettype(t_rtext *x)
{
    switch (x->x_text->te_type) 
    {
    case T_TEXT: return gensym("text");
    case T_OBJECT: return gensym("obj");
    case T_MESSAGE: return gensym("msg");
    case T_ATOM: return gensym("atom");
    }
    return (&s_);
}

/* LATER deal with tcl-significant characters */

/* firstone(), lastone()
 *  + returns byte offset of (first|last) occurrence of 'c' in 's[0..n-1]', or
 *    -1 if none was found
 *  + 's' is a raw byte string
 *  + 'c' is a byte value
 *  + 'n' is the length (in bytes) of the prefix of 's' to be searched.
 *  + we could make these functions work on logical characters in utf8 strings,
 *    but we don't really need to...
 */
static int firstone(char *s, int c, int n)
{
    char *s2 = s + n;
    int i = 0;
    while (s != s2)
    {
        if (*s == c) return (i);
        i++;
        s++;
    }
    return (-1);
}

static int lastone(char *s, int c, int n)
{
    char *s2 = s + n;
    while (s2 != s)
    {
        s2--;
        n--;
        if (*s2 == c) return (n);
    }
    return (-1);
}

    /* the following routine computes line breaks and carries out
    some action which could be:
        SEND_FIRST - draw the box  for the first time
        SEND_UPDATE - redraw the updated box
        otherwise - don't draw, just calculate.
    Called with *widthp and *heightpas coordinates of
    a test point, the routine reports the index of the character found
    there in *indexp.  *widthp and *heightp are set to the width and height
    of the entire text in pixels.
    */

   /*-- moo: 
    * + some variables from the original version have been renamed
    * + variables with a "_b" suffix are raw byte strings, lengths, or offsets
    * + variables with a "_c" suffix are logical character lengths or offsets
    *   (assuming valid UTF-8 encoded byte string in x->x_buf)
    * + a fair amount of O(n) computations required to convert between raw byte
    *   offsets (needed by the C side) and logical character offsets (needed by
    *   the GUI)
    */

    /* LATER get this and sys_vgui to work together properly,
        breaking up messages as needed.  As of now, there's
        a limit of 1950 characters, imposed by sys_vgui(). */
#define UPBUFSIZE 4000
#define BOXWIDTH 60

/* Older (pre-8.3.4) TCL versions handle text selection differently; this
flag is set from the GUI if this happens.  LATER take this out: early 2006? */

extern int sys_oldtclversion;           

static void rtext_senditup(t_rtext *x, int action, int *widthp, int *heightp,
    int *indexp)
{
    t_float dispx, dispy;
    char smallbuf[200], *tempbuf;
    int outchars_b = 0, nlines = 0, ncolumns = 0,
        pixwide, pixhigh, font, fontwidth, fontheight, findx, findy;
    int reportedindex = 0;
    t_canvas *canvas = glist_getcanvas(x->x_glist);
    int widthspec_c = x->x_text->te_width;
    int widthlimit_c = (widthspec_c ? widthspec_c : BOXWIDTH);
    int inindex_b = 0;
    int inindex_c = 0;
    int selstart_b = 0, selend_b = 0;
    int x_bufsize_c = u8_charnum(x->x_buf, x->x_bufsize);
        /* if we're a GOP (the new, "goprect" style) borrow the font size
        from the inside to preserve the spacing */
    if (pd_class(&x->x_text->te_pd) == canvas_class &&
        ((t_glist *)(x->x_text))->gl_isgraph &&
        ((t_glist *)(x->x_text))->gl_goprect)
            font =  glist_getfont((t_glist *)(x->x_text));
    else font = glist_getfont(x->x_glist);
    fontwidth = sys_fontwidth(font);
    fontheight = sys_fontheight(font);
    findx = (*widthp + (fontwidth/2)) / fontwidth;
    findy = *heightp / fontheight;
    if (x->x_bufsize >= 100)
         tempbuf = (char *)t_getbytes(2 * x->x_bufsize + 1);
    else tempbuf = smallbuf;
    while (x_bufsize_c - inindex_c > 0)
    {
        int inchars_b  = x->x_bufsize - inindex_b;
        int inchars_c  = x_bufsize_c  - inindex_c;
        int maxindex_c = (inchars_c > widthlimit_c ? widthlimit_c : inchars_c);
        int maxindex_b = u8_offset(x->x_buf + inindex_b, maxindex_c);
        int eatchar = 1;
        int foundit_b  = firstone(x->x_buf + inindex_b, '\n', maxindex_b);
        int foundit_c;
        if (foundit_b < 0)
        {
            if (inchars_c > widthlimit_c)
            {
                foundit_b = lastone(x->x_buf + inindex_b, ' ', maxindex_b);
                if (foundit_b < 0)
                {
                    foundit_b = maxindex_b;
                    foundit_c = maxindex_c;
                    eatchar = 0;
                }
                else
                    foundit_c = u8_charnum(x->x_buf + inindex_b, foundit_b);
            }
            else
            {
                foundit_b = inchars_b;
                foundit_c = inchars_c;
                eatchar = 0;
            }
        }
        else
            foundit_c = u8_charnum(x->x_buf + inindex_b, foundit_b);

        if (nlines == findy)
        {
            int actualx = (findx < 0 ? 0 :
                (findx > foundit_c ? foundit_c : findx));
            *indexp = inindex_b + u8_offset(x->x_buf + inindex_b, actualx);
            reportedindex = 1;
        }
        strncpy(tempbuf+outchars_b, x->x_buf + inindex_b, foundit_b);
        if (x->x_selstart >= inindex_b &&
            x->x_selstart <= inindex_b + foundit_b + eatchar)
                selstart_b = x->x_selstart + outchars_b - inindex_b;
        if (x->x_selend >= inindex_b &&
            x->x_selend <= inindex_b + foundit_b + eatchar)
                selend_b = x->x_selend + outchars_b - inindex_b;
        outchars_b += foundit_b;
        inindex_b += (foundit_b + eatchar);
        inindex_c += (foundit_c + eatchar);
        if (inindex_b < x->x_bufsize)
            tempbuf[outchars_b++] = '\n';
        if (foundit_c > ncolumns)
            ncolumns = foundit_c;
        nlines++;
    }
    if (!reportedindex)
        *indexp = outchars_b;
    dispx = text_xpix(x->x_text, x->x_glist);
    dispy = text_ypix(x->x_text, x->x_glist);
    if (nlines < 1) nlines = 1;
    if (!widthspec_c)
    {
        while (ncolumns < 3)
        {
            tempbuf[outchars_b++] = ' ';
            ncolumns++;
        }
    }
    else ncolumns = widthspec_c;
    pixwide = ncolumns * fontwidth + (LMARGIN + RMARGIN);
    pixhigh = nlines * fontheight + (TMARGIN + BMARGIN);

    if (action == SEND_FIRST)
        sys_vgui("pdtk_text_new .x%lx.c {%s %s text} %f %f {%.*s} %d %s\n",
            canvas, x->x_tag, rtext_gettype(x)->s_name,
            dispx + LMARGIN, dispy + TMARGIN,
            outchars_b, tempbuf, sys_hostfontsize(font),
            (glist_isselected(x->x_glist,
                &x->x_glist->gl_gobj)? "blue" : "black"));
    else if (action == SEND_UPDATE)
    {
        sys_vgui("pdtk_text_set .x%lx.c %s {%.*s}\n",
            canvas, x->x_tag, outchars_b, tempbuf);
        if (pixwide != x->x_drawnwidth || pixhigh != x->x_drawnheight) 
            text_drawborder(x->x_text, x->x_glist, x->x_tag,
                pixwide, pixhigh, 0);
        if (x->x_active)
        {
            if (selend_b > selstart_b)
            {
                sys_vgui(".x%lx.c select from %s %d\n", canvas, 
                    x->x_tag, u8_charnum(x->x_buf, selstart_b));
                sys_vgui(".x%lx.c select to %s %d\n", canvas, 
                    x->x_tag, u8_charnum(x->x_buf, selend_b)
                              + (sys_oldtclversion ? 0 : -1));
                sys_vgui(".x%lx.c focus \"\"\n", canvas);        
            }
            else
            {
                sys_vgui(".x%lx.c select clear\n", canvas);
                sys_vgui(".x%lx.c icursor %s %d\n", canvas, x->x_tag,
                    u8_charnum(x->x_buf, selstart_b));
                sys_vgui(".x%lx.c focus %s\n", canvas, x->x_tag);        
            }
        }
    }
    x->x_drawnwidth = pixwide;
    x->x_drawnheight = pixhigh;
    
    *widthp = pixwide;
    *heightp = pixhigh;
    if (tempbuf != smallbuf)
        t_freebytes(tempbuf, 2 * x->x_bufsize + 1);
}

void rtext_retext(t_rtext *x)
{
    int w = 0, h = 0, indx;
    t_text *text = x->x_text;
    t_freebytes(x->x_buf, x->x_bufsize);
    binbuf_gettext(text->te_binbuf, &x->x_buf, &x->x_bufsize);
        /* special case: for number boxes, try to pare the number down
        to the specified width of the box. */
    if (text->te_width > 0 && text->te_type == T_ATOM &&
        x->x_bufsize > text->te_width)
    {
        t_atom *atomp = binbuf_getvec(text->te_binbuf);
        int natom = binbuf_getnatom(text->te_binbuf);
        int bufsize = x->x_bufsize;
        if (natom == 1 && atomp->a_type == A_FLOAT)
        {
                /* try to reduce size by dropping decimal digits */
            int wantreduce = bufsize - text->te_width;
            char *decimal = 0, *nextchar, *ebuf = x->x_buf + bufsize,
                *s1, *s2;
            int ndecimals;
            for (decimal = x->x_buf; decimal < ebuf; decimal++)
                if (*decimal == '.')
                    break;
            if (decimal >= ebuf)
                goto giveup;
            for (nextchar = decimal + 1; nextchar < ebuf; nextchar++)
                if (*nextchar < '0' || *nextchar > '9')
                    break;
            if (nextchar - decimal - 1 < wantreduce)
                goto giveup;
            for (s1 = nextchar - wantreduce, s2 = s1 + wantreduce;
                s2 < ebuf; s1++, s2++)
                    *s1 = *s2;
            x->x_buf = t_resizebytes(x->x_buf, bufsize, text->te_width);
            bufsize = text->te_width;
            goto done;
        giveup:
                /* give up and bash it to "+" or "-" */
            x->x_buf[0] = (atomp->a_w.w_float < 0 ? '-' : '+');
            x->x_buf = t_resizebytes(x->x_buf, bufsize, 1);
            bufsize = 1;
        }
        else if (bufsize > text->te_width)
        {
            x->x_buf[text->te_width - 1] = '>';
            x->x_buf = t_resizebytes(x->x_buf, bufsize, text->te_width);
            bufsize = text->te_width;
        }
    done:
        x->x_bufsize = bufsize;
    }
    rtext_senditup(x, SEND_UPDATE, &w, &h, &indx);
}

/* find the rtext that goes with a text item */
t_rtext *glist_findrtext(t_glist *gl, t_text *who)
{
    t_rtext *x;
    if (!gl->gl_editor)
        canvas_create_editor(gl);
    for (x = gl->gl_editor->e_rtext; x && x->x_text != who; x = x->x_next)
        ;
    if (!x) bug("glist_findrtext");
    return (x);
}

int rtext_width(t_rtext *x)
{
    int w = 0, h = 0, indx;
    rtext_senditup(x, SEND_CHECK, &w, &h, &indx);
    return (w);
}

int rtext_height(t_rtext *x)
{
    int w = 0, h = 0, indx;
    rtext_senditup(x, SEND_CHECK, &w, &h, &indx);
    return (h);
}

void rtext_draw(t_rtext *x)
{
    int w = 0, h = 0, indx;
    rtext_senditup(x, SEND_FIRST, &w, &h, &indx);
}

void rtext_erase(t_rtext *x)
{
    sys_vgui(".x%lx.c delete %s\n", glist_getcanvas(x->x_glist), x->x_tag);
}

void rtext_displace(t_rtext *x, int dx, int dy)
{
    sys_vgui(".x%lx.c move %s %d %d\n", glist_getcanvas(x->x_glist), 
        x->x_tag, dx, dy);
}

void rtext_select(t_rtext *x, int state)
{
    t_glist *glist = x->x_glist;
    t_canvas *canvas = glist_getcanvas(glist);
    sys_vgui(".x%lx.c itemconfigure %s -fill %s\n", canvas, 
        x->x_tag, (state? "blue" : "black"));
    canvas_editing = canvas;
}

void rtext_activate(t_rtext *x, int state)
{
    int w = 0, h = 0, indx;
    t_glist *glist = x->x_glist;
    t_canvas *canvas = glist_getcanvas(glist);
    if (state)
    {
        sys_vgui("pdtk_text_editing .x%lx %s 1\n", canvas, x->x_tag);
        glist->gl_editor->e_textedfor = x;
        glist->gl_editor->e_textdirty = 0;
        x->x_dragfrom = x->x_selstart = 0;
        x->x_selend = x->x_bufsize;
        x->x_active = 1;
    }
    else
    {
        sys_vgui("pdtk_text_editing .x%lx {} 0\n", canvas);
        if (glist->gl_editor->e_textedfor == x)
            glist->gl_editor->e_textedfor = 0;
        x->x_active = 0;
    }
    rtext_senditup(x, SEND_UPDATE, &w, &h, &indx);
}

void rtext_key(t_rtext *x, int keynum, t_symbol *keysym)
{
    int w = 0, h = 0, indx, i, newsize, ndel;
    char *s1, *s2;
    if (keynum)
    {
        int n = keynum;
        if (n == '\r') n = '\n';
        if (n == '\b')  /* backspace */
        {
                    /* LATER delete the box if all text is selected...
                    this causes reentrancy problems now. */
            /* if ((!x->x_selstart) && (x->x_selend == x->x_bufsize))
            {
                ....
            } */
            if (x->x_selstart && (x->x_selstart == x->x_selend))
                u8_dec(x->x_buf, &x->x_selstart);
        }
        else if (n == 127)      /* delete */
        {
            if (x->x_selend < x->x_bufsize && (x->x_selstart == x->x_selend))
                u8_inc(x->x_buf, &x->x_selend);
        }
        
        ndel = x->x_selend - x->x_selstart;
        for (i = x->x_selend; i < x->x_bufsize; i++)
            x->x_buf[i- ndel] = x->x_buf[i];
        newsize = x->x_bufsize - ndel;
        x->x_buf = resizebytes(x->x_buf, x->x_bufsize, newsize);
        x->x_bufsize = newsize;

/* at Guenter's suggestion, use 'n>31' to test wither a character might
be printable in whatever 8-bit character set we find ourselves. */

/*-- moo:
  ... but test with "<" rather than "!=" in order to accomodate unicode
  codepoints for n (which we get since Tk is sending the "%A" substitution
  for bind <Key>), effectively reducing the coverage of this clause to 7
  bits.  Case n>127 is covered by the next clause.
*/
        if (n == '\n' || (n > 31 && n < 127))
        {
            newsize = x->x_bufsize+1;
            x->x_buf = resizebytes(x->x_buf, x->x_bufsize, newsize);
            for (i = x->x_bufsize; i > x->x_selstart; i--)
                x->x_buf[i] = x->x_buf[i-1];
            x->x_buf[x->x_selstart] = n;
            x->x_bufsize = newsize;
            x->x_selstart = x->x_selstart + 1;
        }
        /*--moo: check for unicode codepoints beyond 7-bit ASCII --*/
        else if (n > 127)
        {
            int ch_nbytes = u8_wc_nbytes(n);
            newsize = x->x_bufsize + ch_nbytes;
            x->x_buf = resizebytes(x->x_buf, x->x_bufsize, newsize);
            for (i = x->x_bufsize; i > x->x_selstart; i--)
                x->x_buf[i] = x->x_buf[i-1];
            x->x_bufsize = newsize;
            /*-- moo: assume canvas_key() has encoded keysym as UTF-8 */
            strncpy(x->x_buf+x->x_selstart, keysym->s_name, ch_nbytes);
            x->x_selstart = x->x_selstart + ch_nbytes;
        }
        x->x_selend = x->x_selstart;
        x->x_glist->gl_editor->e_textdirty = 1;
    }
    else if (!strcmp(keysym->s_name, "Right"))
    {
        if (x->x_selend == x->x_selstart && x->x_selstart < x->x_bufsize)
        {
            u8_inc(x->x_buf, &x->x_selstart);
            x->x_selend = x->x_selstart;
        }
        else
            x->x_selstart = x->x_selend;
    }
    else if (!strcmp(keysym->s_name, "Left"))
    {
        if (x->x_selend == x->x_selstart && x->x_selstart > 0)
        {
            u8_dec(x->x_buf, &x->x_selstart);
            x->x_selend = x->x_selstart;
        }
        else
            x->x_selend = x->x_selstart;
    }
        /* this should be improved...  life's too short */
    else if (!strcmp(keysym->s_name, "Up"))
    {
        if (x->x_selstart)
            u8_dec(x->x_buf, &x->x_selstart);
        while (x->x_selstart > 0 && x->x_buf[x->x_selstart] != '\n')
            u8_dec(x->x_buf, &x->x_selstart);
        x->x_selend = x->x_selstart;
    }
    else if (!strcmp(keysym->s_name, "Down"))
    {
        while (x->x_selend < x->x_bufsize &&
            x->x_buf[x->x_selend] != '\n')
            u8_inc(x->x_buf, &x->x_selend);
        if (x->x_selend < x->x_bufsize)
            u8_inc(x->x_buf, &x->x_selend);
        x->x_selstart = x->x_selend;
    }
    rtext_senditup(x, SEND_UPDATE, &w, &h, &indx);
}

void rtext_mouse(t_rtext *x, int xval, int yval, int flag)
{
    int w = xval, h = yval, indx;
    rtext_senditup(x, SEND_CHECK, &w, &h, &indx);
    if (flag == RTEXT_DOWN)
    {
        x->x_dragfrom = x->x_selstart = x->x_selend = indx;
    }
    else if (flag == RTEXT_DBL)
    {
        int whereseparator, newseparator;
        x->x_dragfrom = -1;
        whereseparator = 0;
        if ((newseparator = lastone(x->x_buf, ' ', indx)) > whereseparator)
            whereseparator = newseparator+1;
        if ((newseparator = lastone(x->x_buf, '\n', indx)) > whereseparator)
            whereseparator = newseparator+1;
        if ((newseparator = lastone(x->x_buf, ';', indx)) > whereseparator)
            whereseparator = newseparator+1;
        if ((newseparator = lastone(x->x_buf, ',', indx)) > whereseparator)
            whereseparator = newseparator+1;
        x->x_selstart = whereseparator;
        
        whereseparator = x->x_bufsize - indx;
        if ((newseparator =
            firstone(x->x_buf+indx, ' ', x->x_bufsize - indx)) >= 0 &&
                newseparator < whereseparator)
                    whereseparator = newseparator;
        if ((newseparator =
            firstone(x->x_buf+indx, '\n', x->x_bufsize - indx)) >= 0 &&
                newseparator < whereseparator)
                    whereseparator = newseparator;
        if ((newseparator =
            firstone(x->x_buf+indx, ';', x->x_bufsize - indx)) >= 0 &&
                newseparator < whereseparator)
                    whereseparator = newseparator;
        if ((newseparator =
            firstone(x->x_buf+indx, ',', x->x_bufsize - indx)) >= 0 &&
                newseparator < whereseparator)
                    whereseparator = newseparator;
        x->x_selend = indx + whereseparator;
    }
    else if (flag == RTEXT_SHIFT)
    {
        if (indx * 2 > x->x_selstart + x->x_selend)
            x->x_dragfrom = x->x_selstart, x->x_selend = indx;
        else
            x->x_dragfrom = x->x_selend, x->x_selstart = indx;
    }
    else if (flag == RTEXT_DRAG)
    {
        if (x->x_dragfrom < 0)
            return;
        x->x_selstart = (x->x_dragfrom < indx ? x->x_dragfrom : indx);
        x->x_selend = (x->x_dragfrom > indx ? x->x_dragfrom : indx);
    }
    rtext_senditup(x, SEND_UPDATE, &w, &h, &indx);
}