/*
 * @project      The CERN Tape Archive (CTA)
 * @copyright    Copyright © 2022 CERN
 * @license      This program is free software, distributed under the terms of the GNU General Public
 *               Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING". You can
 *               redistribute it and/or modify it under the terms of the GPL Version 3, or (at your
 *               option) any later version.
 *
 *               This program is distributed in the hope that it will be useful, but WITHOUT ANY
 *               WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 *               PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 *               In applying this licence, CERN does not waive the privileges and immunities
 *               granted to it by virtue of its status as an Intergovernmental Organization or
 *               submit itself to any jurisdiction.
 */

#include <string>

#include "catalogue/rdbms/CommonExceptions.hpp"
#include "catalogue/rdbms/RdbmsCatalogueUtils.hpp"
#include "catalogue/rdbms/RdbmsDiskInstanceCatalogue.hpp"
#include "common/dataStructures/DiskInstance.hpp"
#include "common/dataStructures/SecurityIdentity.hpp"
#include "common/exception/Exception.hpp"
#include "common/exception/UserError.hpp"
#include "rdbms/Conn.hpp"
#include "rdbms/ConnPool.hpp"

namespace cta::catalogue {

RdbmsDiskInstanceCatalogue::RdbmsDiskInstanceCatalogue(log::Logger &log, std::shared_ptr<rdbms::ConnPool> connPool)
  : m_log(log), m_connPool(connPool) {}

void RdbmsDiskInstanceCatalogue::createDiskInstance(const common::dataStructures::SecurityIdentity &admin,
  const std::string &name, const std::string &comment) {
  try {
    if(name.empty()) {
      throw UserSpecifiedAnEmptyStringDiskInstanceName("Cannot create disk system because the name is an empty string");
    }
    if(comment.empty()) {
      throw UserSpecifiedAnEmptyStringComment("Cannot create disk system because the comment is an empty string");
    }
    const auto trimmedComment = RdbmsCatalogueUtils::checkCommentOrReasonMaxLength(comment, &m_log);

    auto conn = m_connPool->getConn();
    if(RdbmsCatalogueUtils::diskInstanceExists(conn, name)) {
      throw exception::UserError(std::string("Cannot create disk instance ") + name +
        " because a disk instance with the same name identifier already exists");
    }

    const time_t now = time(nullptr);
    const char *const sql =
      "INSERT INTO DISK_INSTANCE("
        "DISK_INSTANCE_NAME,"

        "USER_COMMENT,"

        "CREATION_LOG_USER_NAME,"
        "CREATION_LOG_HOST_NAME,"
        "CREATION_LOG_TIME,"

        "LAST_UPDATE_USER_NAME,"
        "LAST_UPDATE_HOST_NAME,"
        "LAST_UPDATE_TIME)"
      "VALUES("
        ":DISK_INSTANCE_NAME,"

        ":USER_COMMENT,"

        ":CREATION_LOG_USER_NAME,"
        ":CREATION_LOG_HOST_NAME,"
        ":CREATION_LOG_TIME,"

        ":LAST_UPDATE_USER_NAME,"
        ":LAST_UPDATE_HOST_NAME,"
        ":LAST_UPDATE_TIME)";
    auto stmt = conn.createStmt(sql);

   stmt.bindString(":DISK_INSTANCE_NAME", name);

   stmt.bindString(":USER_COMMENT", trimmedComment);

   stmt.bindString(":CREATION_LOG_USER_NAME", admin.username);
   stmt.bindString(":CREATION_LOG_HOST_NAME", admin.host);
   stmt.bindUint64(":CREATION_LOG_TIME", now);

   stmt.bindString(":LAST_UPDATE_USER_NAME", admin.username);
   stmt.bindString(":LAST_UPDATE_HOST_NAME", admin.host);
   stmt.bindUint64(":LAST_UPDATE_TIME", now);

    stmt.executeNonQuery();
  } catch(exception::UserError &) {
    throw;
  } catch(exception::Exception &ex) {
    ex.getMessage().str(std::string(__FUNCTION__) + ": " + ex.getMessage().str());
    throw;
  }
}

void RdbmsDiskInstanceCatalogue::deleteDiskInstance(const std::string &name) {
  try {
    const char *const delete_sql =
      "DELETE "
      "FROM "
        "DISK_INSTANCE "
      "WHERE "
        "DISK_INSTANCE_NAME = :DISK_INSTANCE_NAME";
    auto conn = m_connPool->getConn();
    auto stmt = conn.createStmt(delete_sql);
      stmt.bindString(":DISK_INSTANCE_NAME", name);
    stmt.executeNonQuery();

    // The delete statement will effect no rows and will not raise an error if
    // either the tape does not exist or if it still has tape files
    if(0 == stmt.getNbAffectedRows()) {
      if(RdbmsCatalogueUtils::diskInstanceExists(conn, name)) {
        throw UserSpecifiedANonEmptyDiskInstanceAfterDelete(std::string("Cannot delete disk instance ") + name + " for unknown reason");
      } else {
        throw UserSpecifiedANonExistentDiskInstance(std::string("Cannot delete disk instance ") + name + " because it does not exist");
      }
    }
  } catch(exception::UserError &) {
    throw;
  } catch(exception::Exception &ex) {
    ex.getMessage().str(std::string(__FUNCTION__) + ": " + ex.getMessage().str());
    throw;
  }
}

void RdbmsDiskInstanceCatalogue::modifyDiskInstanceComment(const common::dataStructures::SecurityIdentity &admin,
  const std::string &name, const std::string &comment) {
  try {
    if(name.empty()) {
      throw UserSpecifiedAnEmptyStringDiskInstanceName("Cannot modify disk instance"
        " because the disk instance name is an empty string");
    }
    if(comment.empty()) {
      throw UserSpecifiedAnEmptyStringComment("Cannot modify disk instance "
        "because the new comment is an empty string");
    }
    const auto trimmedComment = RdbmsCatalogueUtils::checkCommentOrReasonMaxLength(comment, &m_log);

    const time_t now = time(nullptr);
    const char *const sql =
      "UPDATE DISK_INSTANCE SET "
        "USER_COMMENT = :USER_COMMENT,"
        "LAST_UPDATE_USER_NAME = :LAST_UPDATE_USER_NAME,"
        "LAST_UPDATE_HOST_NAME = :LAST_UPDATE_HOST_NAME,"
        "LAST_UPDATE_TIME = :LAST_UPDATE_TIME "
      "WHERE "
        "DISK_INSTANCE_NAME = :DISK_INSTANCE_NAME";
    auto conn = m_connPool->getConn();
    auto stmt = conn.createStmt(sql);
    stmt.bindString(":USER_COMMENT", trimmedComment);
    stmt.bindString(":LAST_UPDATE_USER_NAME", admin.username);
    stmt.bindString(":LAST_UPDATE_HOST_NAME", admin.host);
    stmt.bindUint64(":LAST_UPDATE_TIME", now);
    stmt.bindString(":DISK_INSTANCE_NAME", name);
    stmt.executeNonQuery();

    if(0 == stmt.getNbAffectedRows()) {
      throw UserSpecifiedANonExistentDiskInstance(std::string("Cannot modify disk instance ") + name + " because it does not exist");
    }
  } catch(exception::UserError &) {
    throw;
  } catch(exception::Exception &ex) {
    ex.getMessage().str(std::string(__FUNCTION__) + ": " + ex.getMessage().str());
    throw;
  }
}

std::list<common::dataStructures::DiskInstance> RdbmsDiskInstanceCatalogue::getAllDiskInstances() const {
  try {
    std::list<common::dataStructures::DiskInstance> diskInstanceList;
    std::string sql =
      "SELECT "
        "DISK_INSTANCE.DISK_INSTANCE_NAME AS DISK_INSTANCE_NAME,"

        "DISK_INSTANCE.USER_COMMENT AS USER_COMMENT,"

        "DISK_INSTANCE.CREATION_LOG_USER_NAME AS CREATION_LOG_USER_NAME,"
        "DISK_INSTANCE.CREATION_LOG_HOST_NAME AS CREATION_LOG_HOST_NAME,"
        "DISK_INSTANCE.CREATION_LOG_TIME AS CREATION_LOG_TIME,"

        "DISK_INSTANCE.LAST_UPDATE_USER_NAME AS LAST_UPDATE_USER_NAME,"
        "DISK_INSTANCE.LAST_UPDATE_HOST_NAME AS LAST_UPDATE_HOST_NAME,"
        "DISK_INSTANCE.LAST_UPDATE_TIME AS LAST_UPDATE_TIME "
      "FROM "
        "DISK_INSTANCE";

    auto conn = m_connPool->getConn();
    auto stmt = conn.createStmt(sql);

    auto rset = stmt.executeQuery();
    while (rset.next()) {
      common::dataStructures::DiskInstance diskInstance;
      diskInstance.name = rset.columnString("DISK_INSTANCE_NAME");
      diskInstance.comment = rset.columnString("USER_COMMENT");
      diskInstance.creationLog.username = rset.columnString("CREATION_LOG_USER_NAME");
      diskInstance.creationLog.host = rset.columnString("CREATION_LOG_HOST_NAME");
      diskInstance.creationLog.time = rset.columnUint64("CREATION_LOG_TIME");
      diskInstance.lastModificationLog.username = rset.columnString("LAST_UPDATE_USER_NAME");
      diskInstance.lastModificationLog.host = rset.columnString("LAST_UPDATE_HOST_NAME");
      diskInstance.lastModificationLog.time = rset.columnUint64("LAST_UPDATE_TIME");
      diskInstanceList.push_back(diskInstance);
    }
    return diskInstanceList;
  } catch(exception::UserError &) {
    throw;
  } catch(exception::Exception &ex) {
    ex.getMessage().str(std::string(__FUNCTION__) + ": " + ex.getMessage().str());
    throw;
  }
}

} // namespace cta::catalogue