#include <debugconsole.h>
#include <malloc.h>
#include <map.h>
#include <page_size.h>
#include <process.h>
#include <status.h>
#include <stddef.h>
#include <stdint.h>
#include <system.h>

static int e_pid;

static int e_pgid;

static int pid;

static int pgid;

void _clone_tramp(void);

struct process_data* process_spawn(process_func_t func, void* argument_ptr) {
  void* stack = malloc(STACK_SIZE);
  if (stack == NULL)
    return NULL;

  struct process_data* pdata = malloc(sizeof(*pdata));

  if (pdata == NULL) {
    free(stack);
    return NULL;
  }

  pdata->stack = stack;
  pdata->arg_ptr = argument_ptr;
  pdata->fn = func;

  uintptr_t top = (uintptr_t)stack + STACK_SIZE;
  int pid = clone(top, &_clone_tramp, (void*)pdata);

  if (pid < 0) {
    free(stack);
    free(pdata);
    return NULL;
  }

  pdata->pid = pid;
  return pdata;
}

void process_data_free(struct process_data* pdata) {
  free(pdata->stack);
  free(pdata);
}

void process_self_init(void) {
  e_pid = get_exec_pid();
  e_pgid = get_procgroup(e_pid);
  pid = get_self_pid();
  pgid = get_procgroup(pid);
}

int process_get_exec_pid(void) { return e_pid; }

int process_get_exec_pgid(void) { return e_pgid; }

int process_get_pid(void) { return pid; }

int process_get_pgid(void) { return pgid; }