#include "command.h"

#include "memory.h"
#include "discovery.h"
#include "io.h"
#include "utils.h"
#include "config.h"

#include <assert.h>
#include <unistd.h>
#include <sys/wait.h>

// TODO: This file is UNSAFE. This file is purely here for MVP purposes, and to self-host this program itself.

Command command_create(Arena* a, Discovery* d, Configuration* c)
{
  assert(d != NULL);
  assert(a != NULL);
  assert(c != NULL);
  
  Command cmd;
  cmd.a = a;
  cmd.app = d->cc;

  size_t args_len = d->c_count + 2;
  const char** args_buf = (const char**)arena_alloc(a, sizeof(const char*) * (args_len));
  args_buf[0] = d->cc.buf;

  for(size_t i = 0; i < d->c_count; i++)
  {
    args_buf[i+1] = d->c_files[i]->path.buf;
    LOG_DEBUG("File to build: %s", d->c_files[i]->path);
  }

  args_buf[args_len - 1] = NULL;
  cmd.args = args_buf;
  return cmd;
}

int command_run(Command* cmd)
{
  assert(cmd != NULL);
  if(cmd->args == NULL) DIE("No arguments were supplied to the command");

  pid_t pid = fork();

  if(pid == -1) DIE("fork failed, could not create child process.");
  
  if(pid == 0)
  {
    if(execvp(cmd->app.buf, (char*const*)cmd->args) == -1)
      DIE("Failed to launch command: %s.", cmd->app.buf);
  }

  int wstatus = 0;
  if(waitpid(pid, &wstatus, 0) == -1) DIE("wait failed.");
  LOG_DEBUG("Command calling app %s exited with status code %d on child process PID %d.", cmd->app.buf, wstatus, pid);
  return wstatus;
}