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/* Emacs style mode select   -*- C++ -*-
 *-----------------------------------------------------------------------------
 *
 *
 *  PrBoom a Doom port merged with LxDoom and LSDLDoom
 *  based on BOOM, a modified and improved DOOM engine
 *  Copyright (C) 1999 by
 *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
 *  Copyright (C) 1999-2000 by
 *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 *  02111-1307, USA.
 *
 * DESCRIPTION:  heads-up text and input code
 *
 *-----------------------------------------------------------------------------
 */

#include "doomdef.h"
#include "doomstat.h"
#include "v_video.h"
#include "m_swap.h"
#include "hu_lib.h"
#include "hu_stuff.h"
#include "r_main.h"
#include "r_draw.h"

#include "rockmacros.h"

// boolean : whether the screen is always erased
#define noterased viewwindowx

extern int  key_backspace;                                          // phares
extern int  key_enter;                                              // phares

//
// not used currently
// code to initialize HUlib would go here if needed
//
void HUlib_init(void)
{
}

////////////////////////////////////////////////////////
//
// Basic text line widget
//
////////////////////////////////////////////////////////

//
// HUlib_clearTextLine()
//
// Blank the internal text line in a hu_textline_t widget
//
// Passed a hu_textline_t, returns nothing
//
void HUlib_clearTextLine(hu_textline_t* t)
{
   t->linelen =         // killough 1/23 98: support multiple lines
      t->len = 0;
   t->l[0] = 0;
   t->needsupdate = true;
}

//
// HUlib_initTextLine()
//
// Initialize a hu_textline_t widget. Set the position, font, start char
// of the font, and color range to be used.
//
// Passed a hu_textline_t, and the values used to initialize
// Returns nothing
//
void HUlib_initTextLine(hu_textline_t* t, int x, int y,
                        const patchnum_t* f, int sc, int cm  )
//jff 2/16/98 add color range parameter
{
   t->x = x;
   t->y = y;
   t->f = f;
   t->sc = sc;
   t->cm = cm;
   HUlib_clearTextLine(t);
}

//
// HUlib_addCharToTextLine()
//
// Adds a character at the end of the text line in a hu_textline_t widget
//
// Passed the hu_textline_t and the char to add
// Returns false if already at length limit, true if the character added
//
boolean HUlib_addCharToTextLine
( hu_textline_t*  t,
  char      ch )
{
   // killough 1/23/98 -- support multiple lines
   if (t->linelen == HU_MAXLINELENGTH)
      return false;
   else
   {
      t->linelen++;
      if (ch == '\n')
         t->linelen=0;

      t->l[t->len++] = ch;
      t->l[t->len] = 0;
      t->needsupdate = 4;
      return true;
   }

}

//
// HUlib_delCharFromTextLine()
//
// Deletes a character at the end of the text line in a hu_textline_t widget
//
// Passed the hu_textline_t
// Returns false if already empty, true if the character deleted
//
boolean HUlib_delCharFromTextLine(hu_textline_t* t)
{
   if (!t->len) return false;
   else
   {
      t->l[--t->len] = 0;
      t->needsupdate = 4;
      return true;
   }
}

//
// HUlib_drawTextLine()
//
// Draws a hu_textline_t widget
//
// Passed the hu_textline_t and flag whether to draw a cursor
// Returns nothing
//
void HUlib_drawTextLine
( hu_textline_t* l,
  boolean drawcursor )
{

   int     i;
   int     w;
   int     x;
   unsigned char c;
   int oc = l->cm; //jff 2/17/98 remember default color
   int y = l->y;           // killough 1/18/98 -- support multiple lines

   // draw the new stuff
   x = l->x;
   for (i=0;i<l->len;i++)
   {
      c = toupper(l->l[i]); //jff insure were not getting a cheap toupper conv.

      if (c=='\n')         // killough 1/18/98 -- support multiple lines
         x=0,y+=8;
      else if (c=='\t')    // killough 1/23/98 -- support tab stops
         x=x-x%80+80;
      else if (c=='\x1b')  //jff 2/17/98 escape code for color change
      {                    //jff 3/26/98 changed to actual escape char
         if (++i<l->len)
            if (l->l[i]>='0' && l->l[i]<='9')
               l->cm = l->l[i]-'0';
      }
      else  if (c != ' ' && c >= l->sc && c <= 127)
      {
         w = SHORT(l->f[c - l->sc].width);
         if (x+w > BASE_WIDTH)
            break;
         // killough 1/18/98 -- support multiple lines:
         // CPhipps - patch drawing updated
         V_DrawNumPatch(x, y, FG, l->f[c - l->sc].lumpnum, l->cm, VPT_TRANS | VPT_STRETCH);
         x += w;
      }
      else
      {
         x += 4;
         if (x >= BASE_WIDTH)
            break;
      }
   }
   l->cm = oc; //jff 2/17/98 restore original color

   // draw the cursor if requested
   if (drawcursor && x + SHORT(l->f['_' - l->sc].width) <= BASE_WIDTH)
   {
      // killough 1/18/98 -- support multiple lines
      // CPhipps - patch drawing updated
      V_DrawNumPatch(x, y, FG, l->f['_' - l->sc].lumpnum, CR_DEFAULT, VPT_NONE | VPT_STRETCH);
   }
}

//
// HUlib_eraseTextLine()
//
// Erases a hu_textline_t widget when screen border is behind text
// Sorta called by HU_Erase and just better darn get things straight
//
// Passed the hu_textline_t
// Returns nothing
//
void HUlib_eraseTextLine(hu_textline_t* l)
{
// KK - If someone finds a use for this code, please fix it, I havn't seen the need
//      And it's not written to take into account scaling.  Causing some nasty effects
//      on smaller screens.
   (void)l;
#if 0
   int lh;
   int y;
   int yoffset;

   // Only erases when NOT in automap and the screen is reduced,
   // and the text must either need updating or refreshing
   // (because of a recent change back from the automap)

   if (!(automapmode & am_active) && viewwindowx && l->needsupdate)
   {
      lh = SHORT(l->f[0].height) + 1;
      for (y=l->y,yoffset=y*SCREENWIDTH ; y<l->y+lh ; y++,yoffset+=SCREENWIDTH)
      {
         if (y < viewwindowy || y >= viewwindowy + viewheight)
            R_VideoErase(yoffset, SCREENWIDTH); // erase entire line
         else
         {
            // erase left border
            R_VideoErase(yoffset, viewwindowx);
            // erase right border
            R_VideoErase(yoffset + viewwindowx + viewwidth, viewwindowx);
         }
      }
   }
   if (l->needsupdate) l->needsupdate--;
#endif
}

////////////////////////////////////////////////////////
//
// Player message widget (up to 4 lines of text)
//
////////////////////////////////////////////////////////

//
// HUlib_initSText()
//
// Initialize a hu_stext_t widget. Set the position, number of lines, font,
// start char of the font, and color range to be used, and whether enabled.
//
// Passed a hu_stext_t, and the values used to initialize
// Returns nothing
//
void HUlib_initSText
( hu_stext_t* s,
  int   x,
  int   y,
  int   h,
  const patchnum_t* font,
  int   startchar,
  int cm,       //jff 2/16/98 add color range parameter
  boolean*  on )
{

   int i;

   s->h = h;
   s->on = on;
   s->laston = true;
   s->cl = 0;
   for (i=0;i<h;i++)
      HUlib_initTextLine
      (
         &s->l[i],
         x,
         y - i*(SHORT(font[0].height)+1),
         font,
         startchar,
         cm
      );
}

//
// HUlib_addLineToSText()
//
// Adds a blank line to a hu_stext_t widget
//
// Passed a hu_stext_t
// Returns nothing
//
void HUlib_addLineToSText(hu_stext_t* s)
{

   int i;

   // add a clear line
   if (++s->cl == s->h)
      s->cl = 0;
   HUlib_clearTextLine(&s->l[s->cl]);

   // everything needs updating
   for (i=0 ; i<s->h ; i++)
      s->l[i].needsupdate = 4;

}

//
// HUlib_addMessageToSText()
//
// Adds a message line with prefix to a hu_stext_t widget
//
// Passed a hu_stext_t, the prefix string, and a message string
// Returns nothing
//
void HUlib_addMessageToSText(hu_stext_t* s, const char* prefix, const char* msg)
{
   HUlib_addLineToSText(s);
   if (prefix)
      while (*prefix)
         HUlib_addCharToTextLine(&s->l[s->cl], *(prefix++));

   while (*msg)
      HUlib_addCharToTextLine(&s->l[s->cl], *(msg++));
}

//
// HUlib_drawSText()
//
// Displays a hu_stext_t widget
//
// Passed a hu_stext_t
// Returns nothing
//
void HUlib_drawSText(hu_stext_t* s)
{
   int i, idx;
   hu_textline_t *l;

   if (!*s->on)
      return; // if not on, don't draw

   // draw everything
   for (i=0 ; i<s->h ; i++)
   {
      idx = s->cl - i;
      if (idx < 0)
         idx += s->h; // handle queue of lines

      l = &s->l[idx];

      // need a decision made here on whether to skip the draw
      HUlib_drawTextLine(l, false); // no cursor, please
   }
}

//
// HUlib_eraseSText()
//
// Erases a hu_stext_t widget, when the screen is not fullsize
//
// Passed a hu_stext_t
// Returns nothing
//
void HUlib_eraseSText(hu_stext_t* s)
{
   int i;

   for (i=0 ; i<s->h ; i++)
   {
      if (s->laston && !*s->on)
         s->l[i].needsupdate = 4;
      HUlib_eraseTextLine(&s->l[i]);
   }
   s->laston = *s->on;
}

////////////////////////////////////////////////////////
//
// Scrolling message review widget
//
// jff added 2/26/98
//
////////////////////////////////////////////////////////

//
// HUlib_initMText()
//
// Initialize a hu_mtext_t widget. Set the position, width, number of lines,
// font, start char of the font, color range, background font, and whether
// enabled.
//
// Passed a hu_mtext_t, and the values used to initialize
// Returns nothing
//
void HUlib_initMText(hu_mtext_t *m, int x, int y, int w, int h,
                     const patchnum_t* font, int startchar, int cm,
                     const patchnum_t* bgfont, boolean *on)
{
   int i;

   m->nl = 0;
   m->nr = 0;
   m->cl = -1; //jff 4/28/98 prepare for pre-increment
   m->x = x;
   m->y = y;
   m->w = w;
   m->h = h;
   m->bg = bgfont;
   m->on = on;
   for (i=0;i<HU_MAXMESSAGES;i++)
   {
      HUlib_initTextLine
      (
         &m->l[i],
         x,
         y + (hud_list_bgon? i+1 : i)*HU_REFRESHSPACING,
         font,
         startchar,
         cm
      );
   }
}

//
// HUlib_addLineToMText()
//
// Adds a blank line to a hu_mtext_t widget
//
// Passed a hu_mtext_t
// Returns nothing
//
void HUlib_addLineToMText(hu_mtext_t* m)
{
   // add a clear line
   if (++m->cl == hud_msg_lines)
      m->cl = 0;
   HUlib_clearTextLine(&m->l[m->cl]);

   if (m->nl<hud_msg_lines)
      m->nl++;

   // needs updating
   m->l[m->cl].needsupdate = 4;
}

//
// HUlib_addMessageToMText()
//
// Adds a message line with prefix to a hu_mtext_t widget
//
// Passed a hu_mtext_t, the prefix string, and a message string
// Returns nothing
//
void HUlib_addMessageToMText(hu_mtext_t* m, const char* prefix, const char* msg)
{
   HUlib_addLineToMText(m);
   if (prefix)
      while (*prefix)
         HUlib_addCharToTextLine(&m->l[m->cl], *(prefix++));

   while (*msg)
      HUlib_addCharToTextLine(&m->l[m->cl], *(msg++));
}

//
// HUlib_drawMBg()
//
// Draws a background box which the message display review widget can
// display over
//
// Passed position, width, height, and the background patches
// Returns nothing
//
void HUlib_drawMBg
( int x,
  int y,
  int w,
  int h,
  const patchnum_t* bgp
)
{
   int xs = bgp[0].width;
   int ys = bgp[0].height;
   int i,j;

   // CPhipps - patch drawing updated
   // top rows
   V_DrawNumPatch(x, y, FG, bgp[0].lumpnum, CR_DEFAULT, VPT_STRETCH);    // ul
   for (j=x+xs;j<x+w-xs;j+=xs)           // uc
      V_DrawNumPatch(j, y, FG, bgp[1].lumpnum, CR_DEFAULT, VPT_STRETCH);
   V_DrawNumPatch(j, y, FG, bgp[2].lumpnum, CR_DEFAULT, VPT_STRETCH);    // ur

   // middle rows
   for (i=y+ys;i<y+h-ys;i+=ys)
   {
      V_DrawNumPatch(x, i, FG, bgp[3].lumpnum, CR_DEFAULT, VPT_STRETCH);    // cl
      for (j=x+xs;j<x+w-xs;j+=xs)           // cc
         V_DrawNumPatch(j, i, FG, bgp[4].lumpnum, CR_DEFAULT, VPT_STRETCH);
      V_DrawNumPatch(j, i, FG, bgp[5].lumpnum, CR_DEFAULT, VPT_STRETCH);    // cr
   }

   // bottom row
   V_DrawNumPatch(x, i, FG, bgp[6].lumpnum, CR_DEFAULT, VPT_STRETCH);    // ll
   for (j=x+xs;j<x+w-xs;j+=xs)           // lc
      V_DrawNumPatch(j, i, FG, bgp[7].lumpnum, CR_DEFAULT, VPT_STRETCH);
   V_DrawNumPatch(j, i, FG, bgp[8].lumpnum, CR_DEFAULT, VPT_STRETCH);    // lr
}

//
// HUlib_drawMText()
//
// Displays a hu_mtext_t widget
//
// Passed a hu_mtext_t
// Returns nothing
//
void HUlib_drawMText(hu_mtext_t* m)
{
   int i, idx, y;
   hu_textline_t *l;

   if (!*m->on)
      return; // if not on, don't draw

   // draw everything
   if (hud_list_bgon)
      HUlib_drawMBg(m->x,m->y,m->w,m->h,m->bg);
   y = m->y + HU_REFRESHSPACING;
   for (i=0 ; i<m->nl ; i++)
   {
      idx = m->cl - i;
      if (idx < 0)
         idx += m->nl; // handle queue of lines

      l = &m->l[idx];
      if (hud_list_bgon)
      {
         l->x = m->x + 4;
         l->y = m->y + (i+1)*HU_REFRESHSPACING;
      }
      else
      {
         l->x = m->x;
         l->y = m->y + i*HU_REFRESHSPACING;
      }

      // need a decision made here on whether to skip the draw
      HUlib_drawTextLine(l, false); // no cursor, please
   }
}

//
// HUlib_eraseMBg()
//
// Erases background behind hu_mtext_t widget, when the screen is not fullsize
//
// Passed a hu_mtext_t
// Returns nothing
//
static void HUlib_eraseMBg(hu_mtext_t* m)
{
   int     lh;
   int     y;
   int     yoffset;

   // Only erases when NOT in automap and the screen is reduced,
   // and the text must either need updating or refreshing
   // (because of a recent change back from the automap)

   if (!(automapmode & am_active) && viewwindowx)
   {
      lh = SHORT(m->l[0].f[0].height) + 1;
      for (y=m->y,yoffset=y*SCREENWIDTH ; y<m->y+lh*(hud_msg_lines+2) ; y++,yoffset+=SCREENWIDTH)
      {
         if (y < viewwindowy || y >= viewwindowy + viewheight)
            R_VideoErase(yoffset, SCREENWIDTH); // erase entire line
         else
         {
            // erase left border
            R_VideoErase(yoffset, viewwindowx);
            // erase right border
            R_VideoErase(yoffset + viewwindowx + viewwidth, viewwindowx);

         }
      }
   }
}

//
// HUlib_eraseMText()
//
// Erases a hu_mtext_t widget, when the screen is not fullsize
//
// Passed a hu_mtext_t
// Returns nothing
//
void HUlib_eraseMText(hu_mtext_t* m)
{
   int i;

   if (hud_list_bgon)
      HUlib_eraseMBg(m);

   for (i=0 ; i< m->nl ; i++)
   {
      m->l[i].needsupdate = 4;
      HUlib_eraseTextLine(&m->l[i]);
   }
}

////////////////////////////////////////////////////////
//
// Interactive text entry widget
//
////////////////////////////////////////////////////////

//
// HUlib_initIText()
//
// Initialize a hu_itext_t widget. Set the position, font,
// start char of the font, color range, and whether enabled.
//
// Passed a hu_itext_t, and the values used to initialize
// Returns nothing
//
void HUlib_initIText
( hu_itext_t* it,
  int   x,
  int   y,
  const patchnum_t* font,
  int   startchar,
  int cm,   //jff 2/16/98 add color range parameter
  boolean*  on )
{
   it->lm = 0; // default left margin is start of text
   it->on = on;
   it->laston = true;
   HUlib_initTextLine(&it->l, x, y, font, startchar, cm);
}

// The following deletion routines adhere to the left margin restriction

//
// HUlib_delCharFromIText()
//
// Deletes a character at the end of the text line in a hu_itext_t widget
//
// Passed the hu_itext_t
// Returns nothing
//
void HUlib_delCharFromIText(hu_itext_t* it)
{
   if (it->l.len != it->lm)
      HUlib_delCharFromTextLine(&it->l);
}

//
// HUlib_eraseLineFromIText()
//
// Deletes all characters from a hu_itext_t widget
//
// Passed the hu_itext_t
// Returns nothing
//
void HUlib_eraseLineFromIText(hu_itext_t* it)
{
   while (it->lm != it->l.len)
      HUlib_delCharFromTextLine(&it->l);
}

//
// HUlib_resetIText()
//
// Deletes all characters from a hu_itext_t widget
// Resets left margin as well
//
// Passed the hu_itext_t
// Returns nothing
//
void HUlib_resetIText(hu_itext_t* it)
{
   it->lm = 0;
   HUlib_clearTextLine(&it->l);
}

//
// HUlib_addPrefixToIText()
//
// Adds a prefix string passed to a hu_itext_t widget
// Sets left margin to length of string added
//
// Passed the hu_itext_t and the prefix string
// Returns nothing
//
void HUlib_addPrefixToIText
( hu_itext_t* it,
  char*   str )
{
   while (*str)
      HUlib_addCharToTextLine(&it->l, *(str++));
   it->lm = it->l.len;
}

//
// HUlib_keyInIText()
//
// Wrapper function for handling general keyed input.
//
// Passed the hu_itext_t and the char input
// Returns true if it ate the key
//
boolean HUlib_keyInIText
( hu_itext_t* it,
  unsigned char ch )
{

   if (ch >= ' ' && ch <= '_')
      HUlib_addCharToTextLine(&it->l, (char) ch);
   else if (ch == key_backspace)                   // phares
      HUlib_delCharFromIText(it);
   else if (ch != key_enter)                       // phares
      return false;                                 // did not eat key

   return true;                                    // ate the key
}

//
// HUlib_drawIText()
//
// Displays a hu_itext_t widget
//
// Passed the hu_itext_t
// Returns nothing
//
void HUlib_drawIText(hu_itext_t* it)
{
   hu_textline_t *l = &it->l;

   if (!*it->on)
      return;
   HUlib_drawTextLine(l, true); // draw the line w/ cursor
}

//
// HUlib_eraseIText()
//
// Erases a hu_itext_t widget when the screen is not fullsize
//
// Passed the hu_itext_t
// Returns nothing
//
void HUlib_eraseIText(hu_itext_t* it)
{
   if (it->laston && !*it->on)
      it->l.needsupdate = 4;
   HUlib_eraseTextLine(&it->l);
   it->laston = *it->on;
}