#pragma once

#include "src/kernel/fs.h"
#include "src/kernel/path.h"
#include "src/kernel/stream.h"
#include "src/lib/util.h"

#define USER_RFLAGS 0x202

#define MAX_FDS 16

typedef enum {
  PROCESS_RUNNING,
  PROCESS_WAITING,
  PROCESS_ZOMBIE,
} process_state_t;

typedef struct process {
  const struct process *parent;
  uint64_t *pml4;
  void *kernel_stack;
  void *kernel_rsp;
  void *user_stack;
  void *user_rsp;
  uint64_t pid;
  process_state_t state;
  uint64_t waiting_for;
  const fs_node_t *root;
  const path_t *cwd;
  stream_t *fds[MAX_FDS];
  uint64_t free_fd;
  exit_code_t code;
} process_t;

typedef void (*app_t)(process_t *proc, uint8_t argc, char **argv);

extern process_t *current_process;

extern void process_trampoline();

process_t *process_create(const process_t *parent, const uint8_t *code, uint64_t size);

process_t *process_get(uint64_t pid);

extern void process_switch_to(void **save_rsp, void *new_rsp, void *new_pml4_phys);

void process_next();

void process_destroy(process_t *proc);