/* Copyright (c) 2002-2012 Croteam Ltd. 
This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License as published by
the Free Software Foundation


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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */

#include "StdH.h"
#include "LevelInfo.h"
#include <io.h>

CListHead _lhAutoDemos;
CListHead _lhAllLevels;
CListHead _lhFilteredLevels;
extern INDEX sam_bShowAllLevels;


CLevelInfo::CLevelInfo(void)
{
  li_fnLevel = CTString("Levels\\Default.wld");
  li_strName = TRANS("<invalid level>");
  li_ulSpawnFlags = 0x0;
}
CLevelInfo::CLevelInfo(const CLevelInfo &li)
{
  li_fnLevel      = li.li_fnLevel;    
  li_strName      = li.li_strName;    
  li_ulSpawnFlags = li.li_ulSpawnFlags;
}

void CLevelInfo::operator=(const CLevelInfo &li)
{
  li_fnLevel      = li.li_fnLevel;    
  li_strName      = li.li_strName;    
  li_ulSpawnFlags = li.li_ulSpawnFlags;
}

// get level info for given filename
BOOL GetLevelInfo(CLevelInfo &li, const CTFileName &fnm)
{
  // try to
  try {
    // open the world file
    CTFileStream strm;
    strm.Open_t(fnm);
    // skip initial chunk ids
    strm.ExpectID_t("BUIV"); // 'build version'
    INDEX iDummy;
    strm>>iDummy; // the version number
    strm.ExpectID_t("WRLD"); // 'world'
    strm.ExpectID_t("WLIF"); // 'world info'
    if (strm.PeekID_t()==CChunkID("DTRS")) {
      strm.ExpectID_t("DTRS"); // 'world info'
    }
    // read the name
    strm>>li.li_strName;
    // read the flags
    strm>>li.li_ulSpawnFlags;

    // translate name
    li.li_strName = TranslateConst(li.li_strName, 0);

    // if dummy name
    if (li.li_strName=="") {
      // use filename
      li.li_strName = fnm.FileName();
    }

    // remember filename
    li.li_fnLevel = fnm;

    // succeed
    return TRUE;

  // if failed
  } catch (char *strError) {
    (void) strError;
    //CPrintF("Invalid world file '%s': %s\n", (const char*) fnm, strError);
    // set dummy info
    li = CLevelInfo();
    // fail
    return FALSE;
  }
}
int qsort_CompareLevels(const void *elem1, const void *elem2 )
{
  const CLevelInfo &li1 = **(CLevelInfo **)elem1;
  const CLevelInfo &li2 = **(CLevelInfo **)elem2;
  return strcmp(li1.li_fnLevel, li2.li_fnLevel);
}

// init level-info subsystem
void LoadLevelsList(void)
{
  CPrintF(TRANS("Reading levels directory...\n"));

  // list the levels directory with subdirs
  CDynamicStackArray<CTFileName> afnmDir;
  MakeDirList(afnmDir, CTString("Levels\\"), "*.wld", DLI_RECURSIVE|DLI_SEARCHCD);

  // for each file in the directory
  for (INDEX i=0; i<afnmDir.Count(); i++) {
    CTFileName fnm = afnmDir[i];

    CPrintF(TRANS("  file '%s' : "), (const char *)fnm);
    // try to load its info, and if valid
    CLevelInfo li;
    if (GetLevelInfo(li, fnm)) {
      CPrintF(TRANS("'%s' spawn=0x%08x\n"), li.li_strName, li.li_ulSpawnFlags);

      // create new info for that file
      CLevelInfo *pliNew = new CLevelInfo;
      *pliNew = li;
      // add it to list of all levels
      _lhAllLevels.AddTail(pliNew->li_lnNode);
    } else {
      CPrintF(TRANS("invalid level\n"));
    }
  }

  // sort the list
  _lhAllLevels.Sort(qsort_CompareLevels, offsetof(CLevelInfo, li_lnNode));
}

// cleanup level-info subsystem
void ClearLevelsList(void)
{
  // delete list of levels
  FORDELETELIST(CLevelInfo, li_lnNode, _lhAllLevels, itli) {
    delete &itli.Current();
  }
}

// find all levels that match given flags
void FilterLevels(ULONG ulSpawnFlags)
{
  // delete list of filtered levels
  {FORDELETELIST(CLevelInfo, li_lnNode, _lhFilteredLevels, itli) {
    delete &itli.Current();
  }}

  // for each level in main list
  FOREACHINLIST(CLevelInfo, li_lnNode, _lhAllLevels, itli) {
    CLevelInfo &li = *itli;

    // initially, the level is not visible in list
    BOOL bVisible = FALSE;
    // if all levels are shown, it is visible
    if (sam_bShowAllLevels) {
      bVisible = TRUE;
    // if it satisfies the spawn flags
    } else if (li.li_ulSpawnFlags&ulSpawnFlags) {
      // if spawn flags include single player
      if (ulSpawnFlags&SPF_SINGLEPLAYER) {
        // visibile only if visited already
        bVisible = FileExists(li.li_fnLevel.NoExt()+".vis");
      // if not single player
      } else {
        // it is visibile
        bVisible = TRUE;
      }
    }

    // if visible
    if (bVisible) {
      // make a copy
      CLevelInfo *pliNew = new CLevelInfo;
      *pliNew = li;
      // add it to the list of filtered levels
      _lhFilteredLevels.AddTail(pliNew->li_lnNode);
    }
  }
}

// if level doesn't support given flags, find one that does
void ValidateLevelForFlags(CTString &fnm, ULONG ulSpawnFlags)
{
  // for each level in main list
  {FOREACHINLIST(CLevelInfo, li_lnNode, _lhAllLevels, itli) {
    CLevelInfo &li = *itli;
    // if found
    if (li.li_fnLevel == fnm) {
      // if it satisfies the flags
      if (li.li_ulSpawnFlags&ulSpawnFlags) {
        // all ok
        return;
      }
    }
  }}
  
  // for each level in main list
  {FOREACHINLIST(CLevelInfo, li_lnNode, _lhAllLevels, itli) {
    CLevelInfo &li = *itli;
    // if it satisfies the flags
    if (li.li_ulSpawnFlags&ulSpawnFlags) {
      // use that one
      fnm = li.li_fnLevel;
      return;
    }
  }}

  // if nothing found, use default invalid level
  fnm = CLevelInfo().li_fnLevel;
}

// get level info for its filename
CLevelInfo FindLevelByFileName(const CTFileName &fnm)
{
  // for each level in main list
  FOREACHINLIST(CLevelInfo, li_lnNode, _lhAllLevels, itli) {
    CLevelInfo &li = *itli;
    // if found
    if (li.li_fnLevel == fnm) {
      // return it
      return li;
    }
  }
  // if none found, return dummy
  return CLevelInfo();
}

int qsort_CompareDemos(const void *elem1, const void *elem2 )
{
  const CLevelInfo &li1 = **(CLevelInfo **)elem1;
  const CLevelInfo &li2 = **(CLevelInfo **)elem2;
  return strcmp(li1.li_fnLevel, li2.li_fnLevel);
}

// init list of autoplay demos
void LoadDemosList(void)
{
  CPrintF(TRANS("Reading demos directory...\n"));

  // list the levels directory with subdirs
  CDynamicStackArray<CTFileName> afnmDir;
  MakeDirList(afnmDir, CTString("Demos\\"), "Demos\\Auto-*.dem", DLI_RECURSIVE);

  // for each file in the directory
  for (INDEX i=0; i<afnmDir.Count(); i++) {
    CTFileName fnm = afnmDir[i];
    // create new info for that file
    CLevelInfo *pli = new CLevelInfo;
    pli->li_fnLevel = fnm;
    CPrintF("  %s\n", (const char *)pli->li_fnLevel);
    // add it to list
    _lhAutoDemos.AddTail(pli->li_lnNode);
  }

  // sort the list
  _lhAutoDemos.Sort(qsort_CompareDemos, offsetof(CLevelInfo, li_lnNode));

  // add the intro to the start
  extern CTString sam_strIntroLevel;
  if (sam_strIntroLevel!="") {
    CLevelInfo *pli = new CLevelInfo;
    pli->li_fnLevel = sam_strIntroLevel;
    CPrintF("  %s\n", (const char *)pli->li_fnLevel);
    _lhAutoDemos.AddHead(pli->li_lnNode);
  }
}

// clear list of autoplay demos
void ClearDemosList(void)
{
  // delete list of levels
  FORDELETELIST(CLevelInfo, li_lnNode, _lhAllLevels, itli) {
    delete &itli.Current();
  }
}
