#define _GNU_SOURCE
#include <errno.h>
#include <stdlib.h>
#include "data.h"
#include "login.h"
#include "log.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>

int deserialize_player(FILE* fp, player_t *plr);
int serialize_player(player_t* plr, FILE* fp);
int try_make_data_dirs() {
  int err = 0;
  err = mkdir("data", S_IRWXU);
  err = mkdir("data/players", S_IRWXU);

  return err;
}

int try_load_plr(char *player_name, playerc_t *plr) {
  int err = 0;
  debug("Trying to make data directories...\n");
  try_make_data_dirs();

  debug("Done, opening file.\n");

  char *fname;
  asprintf(&fname, "data/players/%s.plr", player_name);

  FILE *fp;

  if ((fp = fopen(fname, "r"))) {

	  debug("Got fp\n");

        if (deserialize_player(fp, &plr->plr) == EOF) {
           error("Couldn't deserialize player\n");
           return -1;
        }
  } else {

            error("Couldn't open file: %d\n", errno);
            printf("%s", strerror(errno));
            return -1;
  }

  debug("Read file into plr\n");
  fclose(fp);

  return err;
}

int try_write_plr(player_t *plr) {
  int err = 0;

  err = try_make_data_dirs();
  if (err) {
    switch (err) {
      // Now the errors that continue will be from I/O, which we can use to
      // figure out if the file exists in login
    case EACCES: /* No permissions***************************************/
      error("No permissions to create directories\n");
      return -1;
    default: /* Do nothing because this is fine****************************/
      break;
    }
  }

  char *fname;
  asprintf(&fname, "data/players/%s.plr", plr->name);

  FILE *fp = fopen(fname, "w");

  char* buf = malloc(sizeof(player_t) + 1);
  serialize_player(plr, fp);

    fprintf(fp, "%s", buf);
  fclose(fp);

  return err;
}

/*
 * Ugh
 *
 * serialize_player takes in a `player_t` struct and a buffer and does some
 * magic to write out the player in a format that can be easily parsed back
 * including strings
 *
 * because we can't have nice things
 *
 * this function is sensitive to player struct updates so if things break but
 * don't fail to compile this is probably the reason
 */
int serialize_player(player_t *plr, FILE* fp) {
    int err = 0;
    err = fprintf(fp, "%d:%d:%d:%d:%d:%s %s", plr->xp, plr->hp, plr->max_hp, plr->level, plr->location_id, plr->pw_hash, plr->name); 

    return err;
}

/*
 * deserialize_player reverses the results of serialize_player.
 *
 * because even when we're gay we can't have nice things
 *
 * this function is *also* sensitive to player struct updates (no shit) so if
 * things break but still compile it's probably this thing
 */
int deserialize_player(FILE* fp, player_t* plr) {
    int err = 0;

    if (fp == NULL) {
        perror("can't open player file");
        error("Can't open player file");
        return -1;
    }

    plr->pw_hash = (char*) malloc(512);
    plr->name = (char*) malloc(32);

    err = fscanf(fp, "%d:%d:%d:%d:%d:%s %s", &(plr->xp), &(plr->hp), &(plr->max_hp), &(plr->level), &(plr->location_id), plr->pw_hash, plr->name);


   return err;
}