/**
 * Copyright (c) 2026 Dominic Masters
 *
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#include "save/save.h"
#include "save/savestreamlinux.h"
#include "util/string.h"
#include <sys/stat.h>
#include <errno.h>

static void _saveStreamGetPath(
  char_t *out, const size_t max, const uint8_t slot
) {
  snprintf(
    out, max, SAVE_LINUX_FILE_FORMAT,
    SAVE.platform.savePath, (uint32_t)slot
  );
}

errorret_t saveStreamOpenReadLinux(
  savestreamlinux_t *p, bool_t *found, const uint8_t slot
) {
  char_t path[SAVE_LINUX_PATH_MAX];
  _saveStreamGetPath(path, SAVE_LINUX_PATH_MAX, slot);

  p->file = fopen(path, "rb");
  *found = (p->file != NULL);
  errorOk();
}

errorret_t saveStreamOpenWriteLinux(savestreamlinux_t *p, const uint8_t slot) {
  char_t path[SAVE_LINUX_PATH_MAX];
  _saveStreamGetPath(path, SAVE_LINUX_PATH_MAX, slot);

  p->file = fopen(path, "wb");
  if(!p->file) {
    errorThrow("Failed to open save file for writing: slot %u", (uint32_t)slot);
  }
  errorOk();
}

void saveStreamCloseLinux(savestreamlinux_t *p) {
  if(p->file) {
    fclose(p->file);
    p->file = NULL;
  }
}

errorret_t saveStreamReadBytesLinux(
  savestreamlinux_t *p, void *buf, const size_t len
) {
  if(fread(buf, 1, len, p->file) != len) {
    errorThrow("Unexpected end of save file");
  }
  errorOk();
}

errorret_t saveStreamWriteBytesLinux(
  savestreamlinux_t *p, const void *buf, const size_t len
) {
  if(fwrite(buf, 1, len, p->file) != len) {
    errorThrow("Failed to write save data");
  }
  errorOk();
}

errorret_t saveStreamSeekLinux(savestreamlinux_t *p, const size_t pos) {
  if(fseek(p->file, (long)pos, SEEK_SET) != 0) {
    errorThrow("Failed to seek in save file");
  }
  errorOk();
}