/*
 * @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 <memory>

#include "catalogue/rdbms/CommonExceptions.hpp"
#include "catalogue/rdbms/RdbmsCatalogueUtils.hpp"
#include "catalogue/rdbms/RdbmsDiskInstanceCatalogue.hpp"
#include "catalogue/rdbms/RdbmsDiskInstanceSpaceCatalogue.hpp"
#include "common/dataStructures/DiskInstanceSpace.hpp"
#include "common/dataStructures/SecurityIdentity.hpp"
#include "rdbms/Conn.hpp"
#include "rdbms/ConnPool.hpp"

namespace cta::catalogue {

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

void RdbmsDiskInstanceSpaceCatalogue::deleteDiskInstanceSpace(const std::string &name,
  const std::string &diskInstance) {
  try {
    const char *const delete_sql =
      "DELETE "
      "FROM "
        "DISK_INSTANCE_SPACE "
      "WHERE "
        "DISK_INSTANCE_NAME = :DISK_INSTANCE_NAME "
      "AND "
        "DISK_INSTANCE_SPACE_NAME = :DISK_INSTANCE_SPACE_NAME";
    auto conn = m_connPool->getConn();
    auto stmt = conn.createStmt(delete_sql);
    stmt.bindString(":DISK_INSTANCE_NAME", diskInstance);
    stmt.bindString(":DISK_INSTANCE_SPACE_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(diskInstanceSpaceExists(conn, name, diskInstance)) {
        throw UserSpecifiedANonEmptyDiskInstanceSpaceAfterDelete(std::string("Cannot delete disk instance space")
          + name + " for unknown reason");
      } else {
        throw UserSpecifiedANonExistentDiskInstanceSpace(std::string("Cannot delete disk instance space ") 
          + 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 RdbmsDiskInstanceSpaceCatalogue::createDiskInstanceSpace(const common::dataStructures::SecurityIdentity &admin,
  const std::string &name, const std::string &diskInstance, const std::string &freeSpaceQueryURL,
  const uint64_t refreshInterval, const std::string &comment) {
  try {
    if(name.empty()) {
      throw UserSpecifiedAnEmptyStringDiskInstanceSpaceName("Cannot create disk instance space because the name is an empty string");
    }
    if(freeSpaceQueryURL.empty()) {
      throw UserSpecifiedAnEmptyStringFreeSpaceQueryURL("Cannot create disk instance space because the free space query URL is an empty string");
    }
    if(0 == refreshInterval) {
      throw UserSpecifiedAZeroRefreshInterval("Cannot create disk instance space because the refresh interval is zero");
    }
    if(comment.empty()) {
      throw UserSpecifiedAnEmptyStringComment("Cannot create disk instance space because the comment is an empty string");
    }
    const auto trimmedComment = RdbmsCatalogueUtils::checkCommentOrReasonMaxLength(comment, &m_log);

    auto conn = m_connPool->getConn();
    if(!RdbmsCatalogueUtils::diskInstanceExists(conn, diskInstance)) {
      throw exception::UserError(std::string("Cannot create disk instance space ") + name +
        " for disk instance " + diskInstance +
        " because the disk instance does not exist");
    }

    if (diskInstanceSpaceExists(conn, name, diskInstance)) {
      throw exception::UserError(std::string("Cannot create disk instance space ") + name +
        " for disk instance " + diskInstance +
        " because a disk instance space with the same name and disk instance already exists");
    }

    const time_t now = time(nullptr);
    const char *const sql =
      "INSERT INTO DISK_INSTANCE_SPACE("
        "DISK_INSTANCE_NAME,"
        "DISK_INSTANCE_SPACE_NAME,"
        "FREE_SPACE_QUERY_URL,"
        "REFRESH_INTERVAL,"
        "LAST_REFRESH_TIME,"
        "FREE_SPACE,"

        "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,"
        ":DISK_INSTANCE_SPACE_NAME,"
        ":FREE_SPACE_QUERY_URL,"
        ":REFRESH_INTERVAL,"
        ":LAST_REFRESH_TIME,"
        ":FREE_SPACE,"

        ":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", diskInstance);
   stmt.bindString(":DISK_INSTANCE_SPACE_NAME", name);
   stmt.bindString(":FREE_SPACE_QUERY_URL", freeSpaceQueryURL);
   stmt.bindUint64(":REFRESH_INTERVAL", refreshInterval);
   stmt.bindUint64(":LAST_REFRESH_TIME", 0);
   stmt.bindUint64(":FREE_SPACE", 0);

   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;
  }
}

std::list<common::dataStructures::DiskInstanceSpace> RdbmsDiskInstanceSpaceCatalogue::getAllDiskInstanceSpaces() const {
  try {
    std::list<common::dataStructures::DiskInstanceSpace> diskInstanceSpaceList;
    std::string sql =
      "SELECT "
        "DISK_INSTANCE_SPACE.DISK_INSTANCE_NAME AS DISK_INSTANCE_NAME,"
        "DISK_INSTANCE_SPACE.DISK_INSTANCE_SPACE_NAME AS DISK_INSTANCE_SPACE_NAME,"
        "DISK_INSTANCE_SPACE.FREE_SPACE_QUERY_URL AS FREE_SPACE_QUERY_URL,"
        "DISK_INSTANCE_SPACE.REFRESH_INTERVAL AS REFRESH_INTERVAL,"
        "DISK_INSTANCE_SPACE.LAST_REFRESH_TIME AS LAST_REFRESH_TIME,"
        "DISK_INSTANCE_SPACE.FREE_SPACE AS FREE_SPACE,"

        "DISK_INSTANCE_SPACE.USER_COMMENT AS USER_COMMENT,"

        "DISK_INSTANCE_SPACE.CREATION_LOG_USER_NAME AS CREATION_LOG_USER_NAME,"
        "DISK_INSTANCE_SPACE.CREATION_LOG_HOST_NAME AS CREATION_LOG_HOST_NAME,"
        "DISK_INSTANCE_SPACE.CREATION_LOG_TIME AS CREATION_LOG_TIME,"

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

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

    auto rset = stmt.executeQuery();
    while (rset.next()) {
      common::dataStructures::DiskInstanceSpace diskInstanceSpace;
      diskInstanceSpace.name = rset.columnString("DISK_INSTANCE_SPACE_NAME");
      diskInstanceSpace.diskInstance = rset.columnString("DISK_INSTANCE_NAME");
      diskInstanceSpace.freeSpaceQueryURL = rset.columnString("FREE_SPACE_QUERY_URL");
      diskInstanceSpace.refreshInterval =  rset.columnUint64("REFRESH_INTERVAL");
      diskInstanceSpace.freeSpace =  rset.columnUint64("FREE_SPACE");
      diskInstanceSpace.lastRefreshTime =  rset.columnUint64("LAST_REFRESH_TIME");
      diskInstanceSpace.comment = rset.columnString("USER_COMMENT");
      diskInstanceSpace.creationLog.username = rset.columnString("CREATION_LOG_USER_NAME");
      diskInstanceSpace.creationLog.host = rset.columnString("CREATION_LOG_HOST_NAME");
      diskInstanceSpace.creationLog.time = rset.columnUint64("CREATION_LOG_TIME");
      diskInstanceSpace.lastModificationLog.username = rset.columnString("LAST_UPDATE_USER_NAME");
      diskInstanceSpace.lastModificationLog.host = rset.columnString("LAST_UPDATE_HOST_NAME");
      diskInstanceSpace.lastModificationLog.time = rset.columnUint64("LAST_UPDATE_TIME");
      diskInstanceSpaceList.push_back(diskInstanceSpace);
    }
    return diskInstanceSpaceList;
  } catch(exception::UserError &) {
    throw;
  } catch(exception::Exception &ex) {
    ex.getMessage().str(std::string(__FUNCTION__) + ": " + ex.getMessage().str());
    throw;
  }
}

void RdbmsDiskInstanceSpaceCatalogue::modifyDiskInstanceSpaceComment(
  const common::dataStructures::SecurityIdentity &admin, const std::string &name, const std::string &diskInstance,
  const std::string &comment) {
  try {
    if(comment.empty()) {
      throw UserSpecifiedAnEmptyStringComment("Cannot modify disk instance space "
        "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_SPACE 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 "
      "AND "
        "DISK_INSTANCE_SPACE_NAME = :DISK_INSTANCE_SPACE_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", diskInstance);
    stmt.bindString(":DISK_INSTANCE_SPACE_NAME", name);
    stmt.executeNonQuery();

    if(0 == stmt.getNbAffectedRows()) {
      throw UserSpecifiedANonExistentDiskInstanceSpace(std::string("Cannot modify disk system ") + 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 RdbmsDiskInstanceSpaceCatalogue::modifyDiskInstanceSpaceRefreshInterval(
  const common::dataStructures::SecurityIdentity &admin, const std::string &name, const std::string &diskInstance,
  const uint64_t refreshInterval) {
  try {
    if(0 == refreshInterval) {
      throw UserSpecifiedAZeroRefreshInterval("Cannot modify disk instance space "
        "because the new refreshInterval is zero");
    }
    const time_t now = time(nullptr);
    const char *const sql =
      "UPDATE DISK_INSTANCE_SPACE SET "
        "REFRESH_INTERVAL = :REFRESH_INTERVAL,"
        "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 "
      "AND "
        "DISK_INSTANCE_SPACE_NAME = :DISK_INSTANCE_SPACE_NAME";
    auto conn = m_connPool->getConn();
    auto stmt = conn.createStmt(sql);
    stmt.bindUint64(":REFRESH_INTERVAL", refreshInterval);
    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", diskInstance);
    stmt.bindString(":DISK_INSTANCE_SPACE_NAME", name);
    stmt.executeNonQuery();

    if(0 == stmt.getNbAffectedRows()) {
      throw UserSpecifiedANonExistentDiskInstanceSpace(std::string("Cannot modify disk system ") + 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 RdbmsDiskInstanceSpaceCatalogue::modifyDiskInstanceSpaceFreeSpace(const std::string &name,
  const std::string &diskInstance, const uint64_t freeSpace) {
  try {
    const time_t now = time(nullptr);
    const char *const sql =
      "UPDATE DISK_INSTANCE_SPACE SET "
        "FREE_SPACE = :FREE_SPACE,"
        "LAST_REFRESH_TIME = :LAST_REFRESH_TIME "
      "WHERE "
        "DISK_INSTANCE_NAME = :DISK_INSTANCE_NAME "
      "AND "
        "DISK_INSTANCE_SPACE_NAME = :DISK_INSTANCE_SPACE_NAME";
    auto conn = m_connPool->getConn();
    auto stmt = conn.createStmt(sql);
    stmt.bindUint64(":FREE_SPACE", freeSpace);
    stmt.bindUint64(":LAST_REFRESH_TIME", now);
    stmt.bindString(":DISK_INSTANCE_NAME", diskInstance);
    stmt.bindString(":DISK_INSTANCE_SPACE_NAME", name);
    stmt.executeNonQuery();

    if(0 == stmt.getNbAffectedRows()) {
      throw UserSpecifiedANonExistentDiskInstanceSpace(std::string("Cannot modify disk system ") + 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 RdbmsDiskInstanceSpaceCatalogue::modifyDiskInstanceSpaceQueryURL(
  const common::dataStructures::SecurityIdentity &admin, const std::string &name, const std::string &diskInstance,
  const std::string &freeSpaceQueryURL) {
  try {
    if(freeSpaceQueryURL.empty()) {
      throw UserSpecifiedAnEmptyStringFreeSpaceQueryURL("Cannot modify disk instance space "
        "because the new freeSpaceQueryURL is an empty string");
    }

    const time_t now = time(nullptr);
    const char *const sql =
      "UPDATE DISK_INSTANCE_SPACE SET "
        "FREE_SPACE_QUERY_URL = :FREE_SPACE_QUERY_URL,"
        "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 "
      "AND "
        "DISK_INSTANCE_SPACE_NAME = :DISK_INSTANCE_SPACE_NAME";
    auto conn = m_connPool->getConn();
    auto stmt = conn.createStmt(sql);
    stmt.bindString(":FREE_SPACE_QUERY_URL", freeSpaceQueryURL);
    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", diskInstance);
    stmt.bindString(":DISK_INSTANCE_SPACE_NAME", name);
    stmt.executeNonQuery();

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

bool RdbmsDiskInstanceSpaceCatalogue::diskInstanceSpaceExists(rdbms::Conn &conn, const std::string &name,
  const std::string &diskInstance) const {
  try {
    const char *const sql =
      "SELECT "
        "DISK_INSTANCE_SPACE_NAME AS DISK_INSTANCE_SPACE_NAME "
      "FROM "
        "DISK_INSTANCE_SPACE "
      "WHERE "
        "DISK_INSTANCE_NAME = :DISK_INSTANCE_NAME "
      " AND "
        "DISK_INSTANCE_SPACE_NAME = :DISK_INSTANCE_SPACE_NAME";
    auto stmt = conn.createStmt(sql);
    stmt.bindString(":DISK_INSTANCE_NAME", diskInstance);
    stmt.bindString(":DISK_INSTANCE_SPACE_NAME", name);
    auto rset = stmt.executeQuery();
    return rset.next();
  } catch(exception::UserError &) {
    throw;
  } catch(exception::Exception &ex) {
    ex.getMessage().str(std::string(__FUNCTION__) + ": " + ex.getMessage().str());
    throw;
  }
}

} // namespace cta::catalogue