/* 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
 *  Copyright 2005, 2006 by
 *  Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
 *
 *  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"

// 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
//
static 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
//
static 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 = 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 + 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)
{
  int lh;
  int y;

  // 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 = l->f[0].height + 1;
    for (y=l->y; y<l->y+lh ; y++)
      {
      if (y < viewwindowy || y >= viewwindowy + viewheight)
        R_VideoErase(0, y, SCREENWIDTH); // erase entire line
      else
      {
        // erase left border
        R_VideoErase(0, y, viewwindowx);
        // erase right border
        R_VideoErase(viewwindowx + viewwidth, y, viewwindowx);
      }
    }
  }

  if (l->needsupdate) l->needsupdate--;
}

////////////////////////////////////////////////////////
//
// 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*(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
//
static 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
//
static 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;

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