/*****************************************************************************************
 Copyright (c) 2002 The UbixOS Project
 All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of
conditions, the following disclaimer and the list of authors.  Redistributions in binary
form must reproduce the above copyright notice, this list of conditions, the following
disclaimer and the list of authors in the documentation and/or other materials provided
with the distribution. Neither the name of the UbixOS Project nor the names of its
contributors may be used to endorse or promote products derived from this software
without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 $Id$

*****************************************************************************************/

#include <vfs/vfs.h>
#include <vfs/file.h>
#include <ubixos/sched.h>
#include <ubixos/vitals.h>
#include <ubixos/kpanic.h>
#include <ubixos/spinlock.h>
#include <lib/kmalloc.h>
#include <lib/string.h>
#include <vmm/paging.h>
#include <lib/kprintf.h>
#include <assert.h>

static spinLock_t fdTable_lock = SPIN_LOCK_INITIALIZER;


fileDescriptor *fdTable = 0x0;

/* USER */

void sysFwrite(char *ptr,int size,userFileDescriptor *userFd) {
  if (userFd == 0x0) {
      tty_print(ptr,_current->term);
    }
  else {
    fwrite(ptr,size,1,userFd->fd);
    }
  return;
  }
  
void sysFgetc(int *ptr,userFileDescriptor *userFd) {
  fileDescriptor *tmpFd = 0x0;
  tmpFd = userFd->fd;
  if (userFd->fd == 0x0) {
    while (1) {
      if (_current->term == tty_foreground) {
        if ((*ptr = getch()) != 0x0)
          return;
        sched_yield();
        }
      else {
        sched_yield();
        }
 /*
       else {
         kprintf("Waking Task: %i\n",tty_foreground->owner);
         sched_setStatus(tty_foreground->owner,READY);
         kprintf("Sleeping Task: %i\n",_current->id);
         sched_setStatus(_current->id,WAIT);
         sched_yield();
         }
*/
      }
    }
  else {
    ptr[0] = (int) fgetc(tmpFd);
    }
  }

void sysRmDir() {
  return;
  }

void sysFseek(userFileDescriptor *userFd,long offset,int whence) {
  // TODO : coredump?
  if (userFd == NULL)
  	return;
  if (userFd->fd == NULL)
  	return;

  userFd->fd->offset = offset+whence;
  }

void sysChDir(const char *path) {
  if (strstr(path,":") == 0x0) {
    sprintf(_current->oInfo.cwd,"%s%s",_current->oInfo.cwd,path);
    }
  else {
    sprintf(_current->oInfo.cwd,path);
    }
  }

void sysUnlink(const char *path,int *retVal) {
  *retVal = unlink(path);
  }

/************************************************************************

Function: void sysFopen();
Description: Opens A File Descriptor For A User Task
Notes:

************************************************************************/
void sysFopen(const char *file,char *flags,userFileDescriptor *userFd) {
  if (userFd == NULL)
    kprintf("Error: userFd == NULL, File: %s, Line: %i\n",__FILE__,__LINE__);
  userFd->fd = fopen(file,flags);
  if (userFd->fd != 0x0) {
    userFd->fdSize = userFd->fd->size;
    }
  /* Return */
  return;
  }
  
/************************************************************************

Function: void sysFread();
Description: Reads SIZE Bytes From The userFd Into DATA
Notes:

************************************************************************/  
void sysFread(void *data,long size,userFileDescriptor *userFd) {
  /* TODO : coredump? */
  if (userFd == NULL)
  	return;
  if (userFd->fd == NULL)
  	return;
  fread(data,size,1,userFd->fd);
    return;
  }

/************************************************************************

Function: void sysFclse();
Description: Closes A File Descriptor For A User Task
Notes:

************************************************************************/
void sysFclose(userFileDescriptor *userFd,int *status) {
  if (userFd == NULL )
  {
  	*status = -1;
	return;
  }
  if (userFd->fd == NULL)
  {
  	*status = -1;
	return;
  }
  *status = fclose(userFd->fd);
  /* Return */
  return;
  }
  
  

/* KERNEL */


size_t fread(void *ptr,size_t size,size_t nmemb,fileDescriptor *fd) {
  size_t i = 0x0;

  if (fd == 0x0)
    return(0x0);

   if (nmemb == 0x0)
     nmemb = 1; //Temp Fix

   assert(fd);
   assert(fd->mp);
   assert(fd->mp->fs);

   i = fd->mp->fs->vfsRead(fd,ptr,fd->offset,size * nmemb);

   fd->offset += size * nmemb;

   //kprintf("fread: %i:%i",i,size *nmemb);

   return(i);
  }

size_t fwrite(void *ptr,int size,int nmemb,fileDescriptor *fd) {
  if (fd != 0x0) {
    fd->mp->fs->vfsWrite(fd,ptr,fd->offset,size * nmemb);
    fd->offset += size * nmemb;
    }
  return(0x0);
  }

int fseek(fileDescriptor *tmpFd,long offset,int whence) {
  tmpFd->offset = offset+whence;
  return(tmpFd->offset);
  }

/************************************************************************

Function: int feof(fileDescriptor *fd)
Description: Check A File Descriptor For EOF And Return Result
Notes:

************************************************************************/  
int feof(fileDescriptor *fd) {
  if (fd->status == fdEof) {
    return(-1);
    }
  return(0);
  }
  
/************************************************************************

Function: int fputc(int ch,fileDescriptor *fd)
Description: This Will Write Character To FD
Notes:

************************************************************************/
int fputc(int ch,fileDescriptor *fd) {
  if (fd != 0x0) {
    ch = fd->mp->fs->vfsWrite(fd,(char *)ch,fd->offset,1);
    fd->offset++;
    return(ch);
    }
  /* Return NULL If FD Is Not Found */
  return(0x0);
  }
  
/************************************************************************

Function: int fgetc(fileDescriptor *fd)
Description: This Will Return The Next Character In A FD Stream
Notes:

************************************************************************/  
int fgetc(fileDescriptor *fd) {
  int ch = 0x0;
  /* If Found Return Next Char */
  if (fd != 0x0) {
    fd->mp->fs->vfsRead(fd,(char *)&ch,fd->offset,1);
    fd->offset++;
    return(ch);
    }

  /* Return NULL If FD Is Not Found */
  return(0x0);
  }

/************************************************************************

Function: fileDescriptor *fopen(const char *file,cont char *flags)
Description: This Will Open A File And Return A File Descriptor
Notes:

08/05/02 - Just Started A Rewrite Of This Function Should Work Out Well

************************************************************************/

fileDescriptor *fopen(const char *file,const char *flags) {
  int             i          = 0x0;
  char           *path       = 0x0;
  char           *mountPoint = 0x0;
  char            fileName[1024];
  fileDescriptor *tmpFd      = 0x0;

  /* Allocate Memory For File Descriptor */
    if((tmpFd = (fileDescriptor *)kmalloc(sizeof(fileDescriptor))) == 0x0) {
      kprintf("Error: tmpFd == NULL, File: %s, Line: %i\n",__FILE__,__LINE__);
      return(NULL);
    }

  strcpy(fileName,file);

  if (strstr(fileName,":")) {
    mountPoint = (char *)strtok((char *)&fileName,":");
    path = strtok(NULL,"\n");
    }
  else {
    path = fileName;
    }
 
  if (path[0] == '/')
    strcpy(tmpFd->fileName, path);
  else
    sprintf(tmpFd->fileName,"/%s",path);

  /* Find our mount point or set default to sys */
  if (mountPoint == 0x0)
    tmpFd->mp = vfs_findMount("sys");
  else
    tmpFd->mp = vfs_findMount(mountPoint);

  if (tmpFd->mp == 0x0) {
    kprintf("Mount Point Bad\n");
    return(0x0);
    }

  /* This Will Set Up The Descriptor Modes */
  tmpFd->mode = 0;
  for  (i = 0; '\0' != flags[i] ;i++ ) {
    switch(flags[i]) {
      case 'w':
      case 'W':
        tmpFd->mode |= fileWrite;
        break;
      case 'r':
      case 'R':
        tmpFd->mode |= fileRead;
        break;
      case 'b':
      case 'B':
        tmpFd->mode |= fileBinary;
        break;
      case 'a':
      case 'A':
        tmpFd->mode |= fileAppend;
        break;
      default:
	kprintf("Invalid mode '%c' for fopen\n", flags[i]);
        break;
      }
    }
  /* Search For The File */
  if (tmpFd->mp->fs->vfsOpenFile(tmpFd->fileName,tmpFd) == 0x1) {
    /* If The File Is Found Then Set Up The Descriptor */


   /* in order to save resources we will allocate the buffer later when it is needed */

    tmpFd->buffer = (char *)kmalloc(4096);
    if(tmpFd->buffer == 0x0)
    {
      kfree(tmpFd);
      kprintf("Error: tmpFd->buffer == NULL, File: %s, Line: %i\n",__FILE__,__LINE__);
      spinUnlock(&fdTable_lock);
      return 0x1;
    }
    /* Set Its Status To Open */
    tmpFd->status = fdOpen;

    /* Initial File Offset Is Zero */
    tmpFd->offset = 0;
    tmpFd->prev = 0x0;

   /* we do not want to be in a spinlock longer than we need to, so
     it has been moved to here. */
      spinLock(&fdTable_lock);

    /* Increment Number Of Open Files */
    systemVitals->openFiles++;

    tmpFd->next = fdTable;

    if (fdTable != 0x0)
      fdTable->prev = tmpFd;

     fdTable = tmpFd;

      spinUnlock(&fdTable_lock);

    /* Return The FD */
    return(tmpFd);
    }
  else {
    kfree(tmpFd->buffer);
    kfree(tmpFd);
    spinUnlock(&fdTable_lock);
    kprintf("File Not Found? %s\n",file);
    return (NULL);
    }

    /* Return NULL */
    return(0x0);
  }

/************************************************************************

Function: int fclose(fileDescriptor *fd);
Description: This Will Close And Free A File Descriptor
Notes:

************************************************************************/
int fclose(fileDescriptor *fd) {
  fileDescriptor *tmpFd = 0x0;
  assert(fd);
  
  spinLock(&fdTable_lock);
  
  for (tmpFd = fdTable;tmpFd != 0x0;tmpFd = tmpFd->next) {
    if (tmpFd == fd) {
      if (tmpFd->prev)
        tmpFd->prev->next = tmpFd->next;
      if (tmpFd->next)
        tmpFd->next->prev = tmpFd->prev;

      if (tmpFd == fdTable)
        fdTable = tmpFd->next;

      systemVitals->openFiles--;
      spinUnlock(&fdTable_lock);
	if(tmpFd->buffer != NULL)
      		kfree(tmpFd->buffer);
      kfree(tmpFd);
      return(0x0);      
      }
    }
  
  spinUnlock(&fdTable_lock);
  return(0x1);
  }

/* UBU */

/************************************************************************

Function: void sysMkDir(const char *path)
Description: This Will Create A New Directory
Notes:

************************************************************************/
void sysMkDir(const char *path) {
  fileDescriptor *tmpFD = 0x0; 
  char tmpDir[1024];
  char rootPath[256];
  char *dir = 0x0;//UBU*mountPoint = 0x0;
  char *tmp = 0x0;
  rootPath[0] = '\0';
  dir = (char *)path; 

  if (strstr(path,":") == 0x0) {
    sprintf(tmpDir,"%s%s",_current->oInfo.cwd,path);
    dir = (char *)&tmpDir;
    }
  while (strstr(dir,"/")) {
    if (rootPath[0] == 0x0)
      sprintf(rootPath,"%s/",strtok(dir,"/"));
    else
      sprintf(rootPath,"%s%s/",rootPath,strtok(dir,"/"));
    tmp = strtok(NULL,"\n");
    dir = tmp;
    }

  //kprintf("rootPath: [%s]\n",rootPath);
  tmpFD = fopen(rootPath,"rb");

  if (tmpFD->mp == 0x0) {
    kprintf("Invalid Mount Point\n");
    }
  tmpFD->mp->fs->vfsMakeDir(dir,tmpFD);

  fclose(tmpFD);

  return;
  }


/************************************************************************

Function: int unlink(const char *node)
Description: This will unlink a file
Notes:

************************************************************************/

int unlink(const char *node) {
  char *path = 0x0,*mountPoint = 0x0;
  struct vfs_mountPoint *mp = 0x0;

  path = (char *)strtok((char *)node,"@");
  mountPoint = strtok(NULL,"\n");
  if (mountPoint == 0x0) {
    mp = vfs_findMount("sys"); /* _current->oInfo.container; */
    }
  else {
    mp = vfs_findMount(mountPoint);
    }
  if (mp == 0x0) {
    //kpanic("Mount Point Bad");
    return(0x0);
    }
  mp->fs->vfsUnlink(path,mp);
  return(0x0);
  }


/***
 END
 ***/