#ifndef FZL_VM_ENV_H
#define FZL_VM_ENV_H

#include <common/fzl_value.h>
#include <stdbool.h>
#include <stddef.h>

typedef enum
{
  FZL_VM_ENV_WRESULT_OK,
  FZL_VM_ENV_WRESULT_ERR,
  FZL_VM_ENV_WRESULT_ERR_EXISTS,
  FZL_VM_ENV_WRESULT_ERR_NOT_FOUND
} fzl_vm_env_wresult_t;

// Environment table entry descriptor
typedef struct
{
  char *name;
  fzl_value_t value;
} fzl_vm_env_entry_t;

// Environment table descriptor
typedef struct
{
  size_t size;
  size_t remainder;

  fzl_vm_env_entry_t *table;
} fzl_vm_env_t;

// Allocate env table
fzl_vm_env_t *fzl_mkenv();

// Try get value by name
bool fzl_env_lookup(fzl_vm_env_t *env, char *name, fzl_value_t *res);

// Check name in env table
bool fzl_env_contains(fzl_vm_env_t *env, char *name);

// Store new value
fzl_vm_env_wresult_t fzl_env_storevalue(fzl_vm_env_t *env, char *name,
                                        fzl_value_t val);

// Overwrite existing value
fzl_vm_env_wresult_t fzl_env_writevalue(fzl_vm_env_t *env, char *name,
                                        fzl_value_t newval);

// Free env table
void fzl_freeenv(fzl_vm_env_t *env);

#endif // FZL_VM_ENV_H