// Copyright (C) 2015 Ericsson
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.ericsson.gerrit.plugins.evictcache;

import com.google.common.base.Strings;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.client.AccountGroup;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

final class GsonParser {
  private static final String ACCOUNTS = "accounts";
  private static final String GROUPS = "groups";
  private static final String GROUPS_BYINCLUDE = "groups_byinclude";
  private static final String GROUPS_MEMBERS = "groups_members";
  private static final String PROJECT_LIST = "project_list";

  private GsonParser() {
  }

  static Object fromJson(String cacheName, String json) {
    Gson gson = new GsonBuilder().create();
    Object key;
    // Need to add a case for 'adv_bases'
    switch (cacheName) {
      case ACCOUNTS:
        key = gson.fromJson(Strings.nullToEmpty(json).trim(), Account.Id.class);
        break;
      case GROUPS:
        key = gson.fromJson(Strings.nullToEmpty(json).trim(),
            AccountGroup.Id.class);
        break;
      case GROUPS_BYINCLUDE:
      case GROUPS_MEMBERS:
        key = gson.fromJson(Strings.nullToEmpty(json).trim(),
            AccountGroup.UUID.class);
        break;
      case PROJECT_LIST:
        key = gson.fromJson(Strings.nullToEmpty(json), Object.class);
        break;
      default:
        key = gson.fromJson(Strings.nullToEmpty(json).trim(), String.class);
    }
    return key;
  }

  static String toJson(String cacheName, Object key) {
    Gson gson = new GsonBuilder().create();
    String json;
    // Need to add a case for 'adv_bases'
    switch (cacheName) {
      case ACCOUNTS:
        json = gson.toJson(key, Account.Id.class);
        break;
      case GROUPS:
        json = gson.toJson(key, AccountGroup.Id.class);
        break;
      case GROUPS_BYINCLUDE:
      case GROUPS_MEMBERS:
        json = gson.toJson(key, AccountGroup.UUID.class);
        break;
      case PROJECT_LIST:
      default:
        json = gson.toJson(key);
    }
    return json;
  }
}