#ifndef CMD_H
#define CMD_H

#include <stdbool.h>
#include "scanner.h"
#define INITIAL_ARRAY_SIZE 4

// models one executable + options
// thanks to the use of pointers, not as wasteful of memory as it might at first appear.
// this struct makes it much easier to pass a TokenList to an exec() system call.
typedef struct Command {
  char **arguments;
  char *command;
  int capacity;
  int numArguments;
} Command;

// models a list of commands
// used to properly handle piping.
typedef struct CommandList {
  Command *commands;
  int capacity;
  int numCommands;
} CommandList;

// models one complete chain of numCommands
// For lab1, somewhat barebones. 
// Will be expanded upon when we implement redirection/background processes/piping
typedef struct Chain {
  CommandList commands;
  bool runInBackground;
  char *in;
  char *out;
} Chain;


void freeCommand(Command cmd);
void freeChain(Chain chain);

Command buildCommand(List *lp);
void addRedirect(List *lp, Chain *chain);
Chain buildChain(List *lp);

void executeChain(Chain chain, int* status);
#if EXT_PROMPT
bool executeBuiltin(Command cmd, int *status, bool *debug);
#else
bool executeBuiltin(Command cmd, int *status);
#endif

void printChain(Chain chain);
#endif