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

#include "save/savedevice.h"
#include "save/savedevicelinux.h"
#include "save/settings/savesettings.h"
#include "save/savejson.h"
#include "asset/asset.h"
#include "assert/assert.h"
#include "util/mkdirp.h"
#include "util/string.h"

errorret_t saveDeviceLinuxInit(savedevice_t *device) {
  assertNotNull(device, "device cannot be null");

  device->state = SAVE_DEVICE_STATE_UNKNOWN;

  errorOk();
}

errorret_t saveDeviceLinuxUpdate(savedevice_t *device) {
  assertNotNull(device, "device cannot be null");
  assertIsMainThread("Invalid thread");
  errorOk();
}

void saveDeviceLinuxCheckAvailability(savedevice_t *device) {
  assertNotNull(device, "device cannot be null");
  assertIsMainThread("Invalid thread");
  assertTrue(
    device->state == SAVE_DEVICE_STATE_CHECKING_AVAILABILITY,
    "Device state incorrect?"
  );

  // Resolve the save directory - can't actually fail (just a
  // stringFormat), unlike when this derived from $HOME, but this function
  // returns void (via saveDeviceFireCallback below) rather than
  // errorret_t, so there's no return-early errorChain to use here.
  char_t directory[SAVE_DEVICE_LINUX_PATH_MAX];
  errorret_t directoryResult = saveDeviceLinuxGetDirectory(
    directory, sizeof(directory)
  );
  if(errorIsNotOk(directoryResult)) errorCatch(errorPrint(directoryResult));

  // Mkdirp the save directory.
  int mkdirpResult = mkdirp(directory, 0700);
  if(mkdirpResult != 0) {
    device->state = SAVE_DEVICE_STATE_UNAVAILABLE;
    device->reasonKey = "save.linux.mkdirp_failed";
    return saveDeviceFireCallback(device);
  }

  // The save device is available.
  device->state = SAVE_DEVICE_STATE_AVAILABLE;
  device->reasonKey = NULL;
  saveDeviceFireCallback(device);
}

errorret_t saveDeviceLinuxGetDirectory(char_t *dest, const size_t destSize) {
  assertNotNull(dest, "dest cannot be null");

  stringFormat(
    dest, destSize, "%s/%s",
    ASSET.baseDirectory, SAVE_DEVICE_LINUX_SAVES_SUBDIR_NAME
  );
  errorOk();
}

errorret_t saveDeviceLinuxGetSettingsPath(
  char_t *dest,
  const size_t destSize
) {
  assertNotNull(dest, "dest cannot be null");

  char_t directory[SAVE_DEVICE_LINUX_PATH_MAX];
  errorChain(saveDeviceLinuxGetDirectory(directory, sizeof(directory)));

  stringFormat(
    dest, destSize, "%s/%s", directory, SAVE_DEVICE_LINUX_SETTINGS_FILENAME
  );
  errorOk();
}

errorret_t saveDeviceLinuxSettingsWrite(
  savedevice_t *device,
  savesettings_t *settings
) {
  assertNotNull(device, "device cannot be null");
  assertNotNull(settings, "settings cannot be null");

  char_t path[SAVE_DEVICE_LINUX_PATH_MAX];
  errorChain(saveDeviceLinuxGetSettingsPath(path, sizeof(path)));

  writeInit();

  errorret_t writeResult = saveSettingsWriteJSON(settings, doc, object);
  if(errorIsNotOk(writeResult)) {
    yyjson_mut_doc_free(doc);
    errorChain(writeResult);
  }

  yyjson_write_err writeErr;
  bool_t written = yyjson_mut_write_file(path, doc, 0, NULL, &writeErr);
  yyjson_mut_doc_free(doc);

  if(!written) {
    errorThrow(
      "Failed to write save settings file: %s (%s)", path, writeErr.msg
    );
  }

  errorOk();
}

errorret_t saveDeviceLinuxSettingsRead(
  savedevice_t *device,
  savesettings_t *settings
) {
  assertNotNull(device, "device cannot be null");
  assertNotNull(settings, "settings cannot be null");

  char_t path[SAVE_DEVICE_LINUX_PATH_MAX];
  errorChain(saveDeviceLinuxGetSettingsPath(path, sizeof(path)));

  yyjson_read_err readErr;
  yyjson_doc *jsonDoc = yyjson_read_file(path, 0, NULL, &readErr);
  if(jsonDoc == NULL) {
    // No settings file yet, leave settings as-is.
    if(readErr.code == YYJSON_READ_ERROR_FILE_OPEN) errorOk();
    errorThrow(
      "Failed to parse save settings file: %s (%s)", path, readErr.msg
    );
  }

  yyjson_val *object = yyjson_doc_get_root(jsonDoc);
  if(object == NULL) {
    yyjson_doc_free(jsonDoc);
    errorThrow("Save settings file missing root object: %s", path);
  }

  errorret_t readResult = saveSettingsReadJSON(settings, object);
  yyjson_doc_free(jsonDoc);
  errorChain(readResult);

  errorOk();
}

errorret_t saveDeviceLinuxDispose(savedevice_t *device) {
  errorOk();
}