/*-
 * Copyright (c) 2002-2018 The UbixOS Project.
 * All rights reserved.
 *
 * This was developed by Christopher W. Olsen for the UbixOS Project.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1) Redistributions of source code must retain the above copyright notice, this list of
 *    conditions, the following disclaimer and the list of authors.
 * 2) 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.
 * 3) 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 AUTHOR 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.
 */

#include <ubixos/syscall.h>
#include <ubixos/sched.h>
#include <ubixos/exec.h>
#include <sys/elf.h>
#include <ubixos/endtask.h>
#include <ubixos/time.h>
#include <sys/video.h>
#include <sys/trap.h>
#include <vfs/file.h>
#include <ubixfs/ubixfs.h>
#include <string.h>
#include <lib/kprintf.h>
#include <lib/kmalloc.h>
#include <ubixos/vitals.h>
/* #include <sde/sde.h> */
#include <mpi/mpi.h>
#include <vmm/vmm.h>

//long fuword( const void *base );

//void sdeTestThread();

int InvalidSystemCall() {
  kprintf("attempt was made to an invalid system call\n");
  return (0);
}

typedef struct _UbixUser UbixUser;
struct _UbixUser {
  char *username;
  char *password;
  int uid;
  int gid;
  char *home;
  char *shell;
};

int sysAuth(UbixUser *uu) {
  kprintf("authenticating user %s\n", uu->username);

  /* MrOlsen 2016-01-01 uh?
   if(uu->username == "root" && uu->password == "user")
   {
   uu->uid = 0;
   uu->gid = 0;
   }
   */
  uu->uid = -1;
  uu->gid = -1;
  return (0);
}

int sysPasswd(char *passwd) {
  kprintf("changing user password for user %d\n", _current->uid);
  return (0);
}

int sysAddModule() {
  return (0);
}

int sysRmModule() {
  return (0);
}

int sysGetpid(int *pid) {
  if (pid)
    *pid = _current->id;
  return (0);
}

int sysExit(int status) {
  endTask(_current->id);
  return (0x0);
}

int sysCheckPid(int pid, int *ptr) {
  kTask_t *tmpTask = schedFindTask(pid);
  if ((tmpTask != 0x0) && (ptr != 0x0))
    *ptr = tmpTask->state;
  else
    *ptr = 0x0;
  return (0);
}

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

 Function: int sysGetFreePage();
 Description: Allocs A Page To The Users VM Space
 Notes:

 ************************************************************************/
int sysGetFreePage(struct thread *td, uint32_t *count) {
  //MrOlsen 2017-12-15 kprintf("sysGetFreePage - Count: %i\n", *count);
  return ((int) vmm_getFreeVirtualPage(_current->id, *count, VM_THRD));
  //return(vmm_getFreeVirtualPage(_current->id, *count, VM_TASK));
}

int sysGetFreePage_OLD(long *ptr, int count, int type) {
  if (ptr) {
    if (type == 2)
      *ptr = (long) vmm_getFreeVirtualPage(_current->id, count, VM_THRD);
    else
      *ptr = (long) vmm_getFreeVirtualPage(_current->id, count, VM_TASK);
  }
  return (0);
}

int sysGetDrives(uInt32 *ptr) {
  if (ptr)
    *ptr = 0x0; //(uInt32)devices;
  return (0);
}

int sysGetUptime(uInt32 *ptr) {
  if (ptr)
    *ptr = systemVitals->sysTicks;
  return (0);
}

int sysGetTime(uInt32 *ptr) {
  if (ptr)
    *ptr = systemVitals->sysUptime + systemVitals->timeStart;
  return (0);
}

int sys_getcwd(struct thread *td, struct sys_getcwd_args *args) {
  char *buf = (char *) args->buf;
  //kprintf("GETCWD: [%s][0x%X]\n", _current->oInfo.cwd, args->buf);
  if (args->buf) {
    sprintf(buf, "%s", _current->oInfo.cwd);
    buf[strlen(_current->oInfo.cwd)] = '\0';
    //MrOlsen (2018-01-01) - Why is sprintf not null terminating
  }
 // kprintf("GETCWD: [%s][0x%X]\n", _current->oInfo.cwd, args->buf);
 // kprintf("[%s]", args->buf);
  return (0);
}

int sys_sched_yield(struct thread *td, void *args) {
  sched_yield();
  return (0);
}

int sysStartSDE() {
  int i = 0x0;
  for (i = 0; i < 1400; i++) {
    asm("hlt");
  }
  //execThread(sdeThread,(uInt32)(kmalloc(0x2000)+0x2000),0x0);
  for (i = 0; i < 1400; i++) {
    asm("hlt");
  }
  return (0);
}