/*****************************************************************************/
/* D2K: A Doom Source Port for the 21st Century                              */
/*                                                                           */
/* Copyright (C) 2014: See COPYRIGHT file                                    */
/*                                                                           */
/* This file is part of D2K.                                                 */
/*                                                                           */
/* D2K 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.                                                            */
/*                                                                           */
/* D2K 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 D2K.  If not, see <http://www.gnu.org/licenses/>.                    */
/*                                                                           */
/*****************************************************************************/


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

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

//
// not used currently
// code to initialize HUlib would go here if needed
//
#if 0
static void HUlib_init(void)
{
}
#endif

////////////////////////////////////////////////////////
//
// 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->w = 0;
  t->linelen = 0;      // 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
//
//jff 2/16/98 add color range parameter
void HUlib_initTextLine(hu_textline_t* t, int x, int y,
                        const patchnum_t* f, int sc, int cm,
                        enum patch_translation_e flags)
{
  t->x = x;
  t->y = y;
  t->val = -1;
  t->f = f;
  t->sc = sc;
  t->cm = cm;
  t->flags = flags;
  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
//
dboolean HUlib_addCharToTextLine(hu_textline_t *t, char ch)
{
  // killough 1/23/98 -- support multiple lines
  if (t->linelen == HU_MAXLINELENGTH)
    return false;

  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 dboolean HUlib_delCharFromTextLine(hu_textline_t* t)
{
  if (!t->len)
    return false;

  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, dboolean drawcursor)
{

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

  // calculate width of widget
  if (l->w == 0)
  {
    for (i = 0; i < l->len; i++)
    {
      c = toupper(l->l[i]);
      if (c == '\n')
        continue;
      else if (c == '\x1b')
        i++;
      else if (c != ' ' && c >= l->sc && c <= 127)
        l->w += l->f[c - l->sc].width;
      else
        l->w += 4;
    }
  }

  // draw the new stuff

  x = (l->x < 0 ? -l->x - l->w : l->x);
  y = (l->y < 0 ? -l->y - l->f[toupper(l->l[0]) - l->sc].height : l->y);
  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 - l->f[c - l->sc].leftoffset > 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 | l->flags);
      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 | l->flags);
  }
}

//
// 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
//
//jff 2/16/98 add color range parameter
void HUlib_initSText(hu_stext_t *s, int x, int y, int h,
                     const patchnum_t* font, int startchar, int cm,
                     enum patch_translation_e flags, dboolean *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,
      flags
    );
  }
}

//
// 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, enum patch_translation_e flags,
                     dboolean *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,
      flags
    );
  }
}

//
// 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 idx;
  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);

  // [CG] Unused...?
  // int y = m->y + HU_REFRESHSPACING;

  for (int 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
//
//jff 2/16/98 add color range parameter
void HUlib_initIText(hu_itext_t *it, int x, int y, const patchnum_t *font,
                     int startchar, int cm, enum patch_translation_e flags,
                     dboolean *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, flags);
}

// 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
//
#if 0
static void HUlib_eraseLineFromIText(hu_itext_t* it)
{
  while (it->lm != it->l.len)
    HUlib_delCharFromTextLine(&it->l);
}
#endif

//
// 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
//
dboolean 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;
}

//
// HUlib_setTextXCenter()
//
// Centering a hu_textline_t
//
// Passed the hu_textline_t
// Returns nothing
//
void HUlib_setTextXCenter(hu_textline_t *t)
{
  char *s = t->l;

  t->x = 320;

  while (*s)
  {
    int c = toupper(*(s++)) - HU_FONTSTART;

    t->x -= (c < 0 || c > HU_FONTSIZE ? 4 : t->f[c].width);
  }

  if (t->x < 0)
    t->x = 0;

  t->x >>= 1;
}

/* vi: set et ts=2 sw=2: */

