/*
 * @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/RdbmsCatalogue.hpp"
#include "catalogue/rdbms/RdbmsCatalogueUtils.hpp"
#include "catalogue/rdbms/RdbmsMountPolicyCatalogue.hpp"
#include "catalogue/rdbms/RdbmsRequesterMountRuleCatalogue.hpp"
#include "common/dataStructures/RequesterMountRule.hpp"
#include "common/dataStructures/SecurityIdentity.hpp"
#include "common/exception/Exception.hpp"
#include "common/exception/UserError.hpp"
#include "rdbms/ConnPool.hpp"

namespace cta::catalogue {

RdbmsRequesterMountRuleCatalogue::RdbmsRequesterMountRuleCatalogue(log::Logger &log,
  std::shared_ptr<rdbms::ConnPool> connPool, RdbmsCatalogue *rdbmsCatalogue):
  m_log(log), m_connPool(connPool), m_rdbmsCatalogue(rdbmsCatalogue) {}

void RdbmsRequesterMountRuleCatalogue::modifyRequesterMountRulePolicy(
  const common::dataStructures::SecurityIdentity &admin, const std::string &instanceName,
  const std::string &requesterName, const std::string &mountPolicy) {
  try {
    const time_t now = time(nullptr);
    const char *const sql =
      "UPDATE REQUESTER_MOUNT_RULE SET "
        "MOUNT_POLICY_NAME = :MOUNT_POLICY_NAME,"
        "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 "
        "REQUESTER_NAME = :REQUESTER_NAME";
    auto conn = m_connPool->getConn();
    auto stmt = conn.createStmt(sql);
    stmt.bindString(":MOUNT_POLICY_NAME", mountPolicy);
    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", instanceName);
    stmt.bindString(":REQUESTER_NAME", requesterName);
    stmt.executeNonQuery();

    if(0 == stmt.getNbAffectedRows()) {
      throw exception::UserError(std::string("Cannot modify requester mount rule ") + instanceName + ":" +
        requesterName + " because it does not exist");
    }
  } catch(exception::UserError &) {
    throw;
  } catch(exception::Exception &ex) {
    ex.getMessage().str(std::string(__FUNCTION__) + ": " + ex.getMessage().str());
    throw;
  }
}

void RdbmsRequesterMountRuleCatalogue::modifyRequesteMountRuleComment(
  const common::dataStructures::SecurityIdentity &admin, const std::string &instanceName,
  const std::string &requesterName, const std::string &comment) {
  try {
    const auto trimmedComment = RdbmsCatalogueUtils::checkCommentOrReasonMaxLength(comment, &m_log);
    const time_t now = time(nullptr);
    const char *const sql =
      "UPDATE REQUESTER_MOUNT_RULE 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 "
        "REQUESTER_NAME = :REQUESTER_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", instanceName);
    stmt.bindString(":REQUESTER_NAME", requesterName);
    stmt.executeNonQuery();

    if(0 == stmt.getNbAffectedRows()) {
      throw exception::UserError(std::string("Cannot modify requester mount rule ") + instanceName + ":" +
        requesterName + " because it does not exist");
    }
  } catch(exception::UserError &) {
    throw;
  } catch(exception::Exception &ex) {
    ex.getMessage().str(std::string(__FUNCTION__) + ": " + ex.getMessage().str());
    throw;
  }
}

void RdbmsRequesterMountRuleCatalogue::createRequesterMountRule(const common::dataStructures::SecurityIdentity &admin,
  const std::string &mountPolicyName, const std::string &diskInstanceName, const std::string &requesterName,
  const std::string &comment) {
  try {
    const auto trimmedComment = RdbmsCatalogueUtils::checkCommentOrReasonMaxLength(comment, &m_log);
    const auto user = User(diskInstanceName, requesterName);
    auto conn = m_connPool->getConn();
    const auto mountPolicyCatalogue = static_cast<RdbmsMountPolicyCatalogue*>(m_rdbmsCatalogue->MountPolicy().get());
    const auto mountPolicy = mountPolicyCatalogue->getRequesterMountPolicy(conn, user);
    if(mountPolicy) {
      throw exception::UserError(std::string("Cannot create rule to assign mount-policy ") + mountPolicyName +
        " to requester " + diskInstanceName + ":" + requesterName +
        " because the requester is already assigned to mount-policy " + mountPolicy->name);
    }
    if(!RdbmsCatalogueUtils::mountPolicyExists(conn, mountPolicyName)) {
      throw exception::UserError(std::string("Cannot create a rule to assign mount-policy ") + mountPolicyName +
        " to requester " + diskInstanceName + ":" + requesterName + " because mount-policy " + mountPolicyName +
        " does not exist");
    }
    if(!RdbmsCatalogueUtils::diskInstanceExists(conn, diskInstanceName)) {
      throw exception::UserError(std::string("Cannot create a rule to assign mount-policy ") + mountPolicyName +
        " to requester " + diskInstanceName + ":" + requesterName + " because disk-instance " + diskInstanceName +
        " does not exist");
    }

    const uint64_t now = time(nullptr);
    const char *const sql =
      "INSERT INTO REQUESTER_MOUNT_RULE("
        "DISK_INSTANCE_NAME,"
        "REQUESTER_NAME,"
        "MOUNT_POLICY_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,"
        ":REQUESTER_NAME,"
        ":MOUNT_POLICY_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", diskInstanceName);
    stmt.bindString(":REQUESTER_NAME", requesterName);
    stmt.bindString(":MOUNT_POLICY_NAME", mountPolicyName);

    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;
  }

  m_rdbmsCatalogue->m_userMountPolicyCache.invalidate();
}

std::list<common::dataStructures::RequesterMountRule> RdbmsRequesterMountRuleCatalogue::getRequesterMountRules() const {
  try {
    std::list<common::dataStructures::RequesterMountRule> rules;
    const char *const sql =
      "SELECT "
        "DISK_INSTANCE_NAME AS DISK_INSTANCE_NAME,"
        "REQUESTER_NAME AS REQUESTER_NAME,"
        "MOUNT_POLICY_NAME AS MOUNT_POLICY_NAME,"

        "USER_COMMENT AS USER_COMMENT,"

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

        "LAST_UPDATE_USER_NAME AS LAST_UPDATE_USER_NAME,"
        "LAST_UPDATE_HOST_NAME AS LAST_UPDATE_HOST_NAME,"
        "LAST_UPDATE_TIME AS LAST_UPDATE_TIME "
      "FROM "
        "REQUESTER_MOUNT_RULE "
      "ORDER BY "
        "DISK_INSTANCE_NAME, REQUESTER_NAME, MOUNT_POLICY_NAME";
    auto conn = m_connPool->getConn();
    auto stmt = conn.createStmt(sql);
    auto rset = stmt.executeQuery();
    while(rset.next()) {
      common::dataStructures::RequesterMountRule rule;

      rule.diskInstance = rset.columnString("DISK_INSTANCE_NAME");
      rule.name = rset.columnString("REQUESTER_NAME");
      rule.mountPolicy = rset.columnString("MOUNT_POLICY_NAME");
      rule.comment = rset.columnString("USER_COMMENT");
      rule.creationLog.username = rset.columnString("CREATION_LOG_USER_NAME");
      rule.creationLog.host = rset.columnString("CREATION_LOG_HOST_NAME");
      rule.creationLog.time = rset.columnUint64("CREATION_LOG_TIME");
      rule.lastModificationLog.username = rset.columnString("LAST_UPDATE_USER_NAME");
      rule.lastModificationLog.host = rset.columnString("LAST_UPDATE_HOST_NAME");
      rule.lastModificationLog.time = rset.columnUint64("LAST_UPDATE_TIME");

      rules.push_back(rule);
    }

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

void RdbmsRequesterMountRuleCatalogue::deleteRequesterMountRule(const std::string &diskInstanceName,
  const std::string &requesterName) {
  try {
    const char *const sql =
      "DELETE FROM "
        "REQUESTER_MOUNT_RULE "
      "WHERE "
        "DISK_INSTANCE_NAME = :DISK_INSTANCE_NAME AND "
        "REQUESTER_NAME = :REQUESTER_NAME";
    auto conn = m_connPool->getConn();
    auto stmt = conn.createStmt(sql);
    stmt.bindString(":DISK_INSTANCE_NAME", diskInstanceName);
    stmt.bindString(":REQUESTER_NAME", requesterName);
    stmt.executeNonQuery();

    if(0 == stmt.getNbAffectedRows()) {
      throw exception::UserError(std::string("Cannot delete mount rule for requester ") + diskInstanceName + ":" + requesterName +
        " because the rule does not exist");
    }
  } catch(exception::UserError &) {
    throw;
  } catch(exception::Exception &ex) {
    ex.getMessage().str(std::string(__FUNCTION__) + ": " + ex.getMessage().str());
    throw;
  }

  m_rdbmsCatalogue->m_userMountPolicyCache.invalidate();
}

} // namespace cta::catalogue