// SeedOperationState reads states for a given seed operation
func ReadSeedStates(seedId int64) ([]SeedOperationState, error) {
	res := []SeedOperationState{}
	query := `
		select 
			agent_seed_state_id,
			agent_seed_id,
			state_timestamp,
			state_action,
			error_message
		from 
			agent_seed_state
		where
			agent_seed_id = ?
		order by
			agent_seed_state_id desc
		`
	err := db.QueryOrchestrator(query, sqlutils.Args(seedId), func(m sqlutils.RowMap) error {
		seedState := SeedOperationState{}
		seedState.SeedStateId = m.GetInt64("agent_seed_state_id")
		seedState.SeedId = m.GetInt64("agent_seed_id")
		seedState.StateTimestamp = m.GetString("state_timestamp")
		seedState.Action = m.GetString("state_action")
		seedState.ErrorMessage = m.GetString("error_message")

		res = append(res, seedState)
		return nil
	})

	if err != nil {
		log.Errore(err)
	}
	return res, err
}

// readAgentBasicInfo returns the basic data for an agent directly from backend table (no agent access)
func readAgentBasicInfo(hostname string) (Agent, string, error) {
	agent := Agent{}
	token := ""
	query := `
		select 
			hostname,
			port,
			token,
			last_submitted,
			mysql_port
		from 
			host_agent
		where
			hostname = ?
		`
	err := db.QueryOrchestrator(query, sqlutils.Args(hostname), func(m sqlutils.RowMap) error {
		agent.Hostname = m.GetString("hostname")
		agent.Port = m.GetInt("port")
		agent.LastSubmitted = m.GetString("last_submitted")
		agent.MySQLPort = m.GetInt64("mysql_port")
		token = m.GetString("token")

		return nil
	})
	if err != nil {
		return agent, "", err
	}

	if token == "" {
		return agent, "", log.Errorf("Cannot get agent/token: %s", hostname)
	}
	return agent, token, nil
}

// ReadMaintenanceInstanceKey will return the instanceKey for active maintenance by maintenanceToken
func ReadMaintenanceInstanceKey(maintenanceToken int64) (*InstanceKey, error) {
	var res *InstanceKey
	query := `
		select 
			hostname, port 
		from 
			database_instance_maintenance 
		where
			database_instance_maintenance_id = ?
			`

	err := db.QueryOrchestrator(query, sqlutils.Args(maintenanceToken), func(m sqlutils.RowMap) error {
		instanceKey, merr := NewInstanceKeyFromStrings(m.GetString("hostname"), m.GetString("port"))
		if merr != nil {
			return merr
		}

		res = instanceKey
		return nil
	})

	if err != nil {
		log.Errore(err)
	}
	return res, err
}

// AgentSeedDetails reads details from backend table
func AgentSeedDetails(seedId int64) ([]SeedOperation, error) {
	whereCondition := `
		where
			agent_seed_id = ?
		`
	return readSeeds(whereCondition, sqlutils.Args(seedId), "")
}

func ReadClusterPoolInstances(clusterName string) (*PoolInstancesMap, error) {
	var poolInstancesMap = make(PoolInstancesMap)

	query := `
		select 
			database_instance_pool.*
		from 
			database_instance
			join database_instance_pool using (hostname, port)
		where
			database_instance.cluster_name = ?
		`
	err := db.QueryOrchestrator(query, sqlutils.Args(clusterName), func(m sqlutils.RowMap) error {
		pool := m.GetString("pool")
		hostname := m.GetString("hostname")
		port := m.GetInt("port")
		if _, ok := poolInstancesMap[pool]; !ok {
			poolInstancesMap[pool] = [](*InstanceKey){}
		}
		poolInstancesMap[pool] = append(poolInstancesMap[pool], &InstanceKey{Hostname: hostname, Port: port})
		return nil
	})

	if err != nil {
		return nil, err
	}

	return &poolInstancesMap, nil

}

func readAvailableNodes(onlyHttpNodes bool) ([]string, error) {
	res := []string{}
	extraInfo := ""
	if onlyHttpNodes {
		extraInfo = string(OrchestratorExecutionHttpMode)
	}
	query := `
		select 
			concat(hostname, ';', token) as node
		from 
			node_health
		where
			last_seen_active > now() - interval ? second
			and ? in (extra_info, '')
		order by
			hostname
		`

	err := db.QueryOrchestrator(query, sqlutils.Args(registrationPollSeconds*2, extraInfo), func(m sqlutils.RowMap) error {
		res = append(res, m.GetString("node"))
		return nil
	})
	if err != nil {
		log.Errore(err)
	}
	return res, err
}

// ReadRecentlyActiveClusterRecovery reads recently completed entries for a given cluster
func ReadRecentlyActiveClusterRecovery(clusterName string) ([]TopologyRecovery, error) {
	whereClause := `
		where 
			end_recovery > now() - interval 5 minute
			and cluster_name=?`
	return readRecoveries(whereClause, ``, sqlutils.Args(clusterName))
}

// ReadActiveRecoveries reads active recovery entry/audit entires from topology_recovery
func ReadActiveRecoveries() ([]TopologyRecovery, error) {
	return readRecoveries(`
		where 
			in_active_period=1
			and end_recovery is null`,
		``, sqlutils.Args())
}

// ReadInActivePeriodClusterRecovery reads recoveries (possibly complete!) that are in active period.
// (may be used to block further recoveries on this cluster)
func ReadInActivePeriodClusterRecovery(clusterName string) ([]TopologyRecovery, error) {
	whereClause := `
		where 
			in_active_period=1
			and cluster_name=?`
	return readRecoveries(whereClause, ``, sqlutils.Args(clusterName))
}

// AcknowledgeInstanceRecoveries marks active recoveries for given instane as acknowledged.
// This also implied clearing their active period, which in turn enables further recoveries on those topologies
func AcknowledgeInstanceRecoveries(instanceKey *inst.InstanceKey, owner string, comment string) (countAcknowledgedEntries int64, err error) {
	whereClause := `
			hostname = ?
			and port = ?
		`
	return acknowledgeRecoveries(owner, comment, false, whereClause, sqlutils.Args(instanceKey.Hostname, instanceKey.Port))
}

// acknowledgeRecoveries sets acknowledged* details and clears the in_active_period flags from a set of entries
func acknowledgeRecoveries(owner string, comment string, markEndRecovery bool, whereClause string, args []interface{}) (countAcknowledgedEntries int64, err error) {
	additionalSet := ``
	if markEndRecovery {
		additionalSet = `
				end_recovery=IFNULL(end_recovery, NOW()),
			`
	}
	query := fmt.Sprintf(`
			update topology_recovery set 
				in_active_period = 0,
				end_active_period_unixtime = IF(end_active_period_unixtime = 0, UNIX_TIMESTAMP(), end_active_period_unixtime),
				%s
				acknowledged = 1,
				acknowledged_at = NOW(),
				acknowledged_by = ?,
				acknowledge_comment = ?
			where
				acknowledged = 0
				and
				%s
		`, additionalSet, whereClause)
	args = append(sqlutils.Args(owner, comment), args...)
	sqlResult, err := db.ExecOrchestrator(query, args...)
	if err != nil {
		return 0, log.Errore(err)
	}
	rows, err := sqlResult.RowsAffected()
	return rows, log.Errore(err)
}

// ReadLongRunningProcesses returns the list of current known long running processes of all instances
func ReadLongRunningProcesses(filter string) ([]Process, error) {
	longRunningProcesses := []Process{}

	if filter != "" {
		filter = "%" + filter + "%"
	} else {
		filter = "%"
	}
	query := `
		select 
			hostname,
			port,
			process_id,
			process_started_at,
			process_user,
			process_host,
			process_db,
			process_command,
			process_time_seconds,
			process_state,
			process_info
		from 
			database_instance_long_running_queries
		where
			hostname like ?
			or process_user like ?
			or process_host like ?
			or process_db like ?
			or process_command like ?
			or process_state like ?
			or process_info like ?
		order by
			process_time_seconds desc
		`
	args := sqlutils.Args(filter, filter, filter, filter, filter, filter, filter)
	err := db.QueryOrchestrator(query, args, func(m sqlutils.RowMap) error {
		process := Process{}
		process.InstanceHostname = m.GetString("hostname")
		process.InstancePort = m.GetInt("port")
		process.Id = m.GetInt64("process_id")
		process.User = m.GetString("process_user")
		process.Host = m.GetString("process_host")
		process.Db = m.GetString("process_db")
		process.Command = m.GetString("process_command")
		process.Time = m.GetInt64("process_time_seconds")
		process.State = m.GetString("process_state")
		process.Info = m.GetString("process_info")
		process.StartedAt = m.GetString("process_started_at")

		longRunningProcesses = append(longRunningProcesses, process)
		return nil
	})

	if err != nil {
		log.Errore(err)
	}
	return longRunningProcesses, err

}

// GetHostAttributesByMatch
func GetHostAttributesByAttribute(attributeName string, valueMatch string) ([]HostAttributes, error) {
	if valueMatch == "" {
		valueMatch = ".?"
	}
	whereClause := ` where attribute_name = ? and attribute_value rlike ?`

	return getHostAttributesByClause(whereClause, sqlutils.Args(attributeName, valueMatch))
}

// ReadRecentlyActiveInstanceRecovery reads recently completed entries for a given instance
func ReadRecentlyActiveInstanceRecovery(instanceKey *inst.InstanceKey) ([]TopologyRecovery, error) {
	whereClause := `
		where 
			end_recovery > now() - interval 5 minute
			and 
				successor_hostname=? and successor_port=?`
	return readRecoveries(whereClause, ``, sqlutils.Args(instanceKey.Hostname, instanceKey.Port))
}

// ReadInActivePeriodSuccessorInstanceRecovery reads completed recoveries for a given instance, where said instance
// was promoted as result, still in active period (may be used to block further recoveries should this instance die)
func ReadInActivePeriodSuccessorInstanceRecovery(instanceKey *inst.InstanceKey) ([]TopologyRecovery, error) {
	whereClause := `
		where 
			in_active_period=1
			and 
				successor_hostname=? and successor_port=?`
	return readRecoveries(whereClause, ``, sqlutils.Args(instanceKey.Hostname, instanceKey.Port))
}

func GetEquivalentMasterCoordinates(instanceCoordinates *InstanceBinlogCoordinates) (result [](*InstanceBinlogCoordinates), err error) {
	query := `
		select 
				master1_hostname as hostname,
				master1_port as port,
				master1_binary_log_file as binlog_file,
				master1_binary_log_pos as binlog_pos
			from 
				master_position_equivalence
			where
				master2_hostname = ?
				and master2_port = ?
				and master2_binary_log_file = ?
				and master2_binary_log_pos = ?
		union
		select 
				master2_hostname as hostname,
				master2_port as port,
				master2_binary_log_file as binlog_file,
				master2_binary_log_pos as binlog_pos
			from 
				master_position_equivalence
			where
				master1_hostname = ?
				and master1_port = ?
				and master1_binary_log_file = ?
				and master1_binary_log_pos = ?
		`
	args := sqlutils.Args(
		instanceCoordinates.Key.Hostname,
		instanceCoordinates.Key.Port,
		instanceCoordinates.Coordinates.LogFile,
		instanceCoordinates.Coordinates.LogPos,
		instanceCoordinates.Key.Hostname,
		instanceCoordinates.Key.Port,
		instanceCoordinates.Coordinates.LogFile,
		instanceCoordinates.Coordinates.LogPos,
	)

	err = db.QueryOrchestrator(query, args, func(m sqlutils.RowMap) error {
		equivalentCoordinates := InstanceBinlogCoordinates{}
		equivalentCoordinates.Key.Hostname = m.GetString("hostname")
		equivalentCoordinates.Key.Port = m.GetInt("port")
		equivalentCoordinates.Coordinates.LogFile = m.GetString("binlog_file")
		equivalentCoordinates.Coordinates.LogPos = m.GetInt64("binlog_pos")

		result = append(result, &equivalentCoordinates)
		return nil
	})

	if err != nil {
		return nil, err
	}

	return result, nil
}

// ReadRecentCompletedSeedsForHost reads active seeds where host participates either as source or target
func ReadRecentCompletedSeedsForHost(hostname string) ([]SeedOperation, error) {
	whereCondition := `
		where
			is_complete = 1
			and (
				target_hostname = ?
				or source_hostname = ?
			)
		`
	return readSeeds(whereCondition, sqlutils.Args(hostname, hostname), "limit 10")
}

func ReadPendingAsyncRequests(limit int) (res [](*AsyncRequest), err error) {
	limitClause := ``
	args := sqlutils.Args()
	if limit > 0 {
		limitClause = `limit ?`
		args = append(args, limit)
	}
	query := fmt.Sprintf(`
		select 
			request_id,
			command,
			hostname,
			port,
			destination_hostname,
			destination_port,
			pattern,    
			gtid_hint,
			story
		from 
			async_request
		where
			begin_timestamp IS NULL
		order by
			request_id asc
		%s
		`, limitClause)
	err = db.QueryOrchestrator(query, args, func(m sqlutils.RowMap) error {
		asyncRequest := NewEmptyAsyncRequest()
		asyncRequest.Id = m.GetInt64("request_id")
		asyncRequest.Command = m.GetString("command")

		asyncRequest.OperatedInstanceKey = &inst.InstanceKey{}
		asyncRequest.OperatedInstanceKey.Hostname = m.GetString("hostname")
		asyncRequest.OperatedInstanceKey.Port = m.GetInt("port")

		if m.GetString("destination_hostname") != "" {
			asyncRequest.DestinationKey = &inst.InstanceKey{}
			asyncRequest.DestinationKey.Hostname = m.GetString("destination_hostname")
			asyncRequest.DestinationKey.Port = m.GetInt("destination_port")
		}

		asyncRequest.Pattern = m.GetString("pattern")
		asyncRequest.GTIDHint = inst.OperationGTIDHint(m.GetString("gtid_hint"))
		asyncRequest.Story = m.GetString("story")

		res = append(res, asyncRequest)
		return nil
	})

	if err != nil {
		log.Errore(err)
	}
	return res, err
}

// ReadActiveSeedsForHost reads active seeds where host participates either as source or target
func ReadActiveSeedsForHost(hostname string) ([]SeedOperation, error) {
	whereCondition := `
		where
			is_complete = 0
			and (
				target_hostname = ?
				or source_hostname = ?
			)
		`
	return readSeeds(whereCondition, sqlutils.Args(hostname, hostname), "")
}

// ReadRecentAudit returns a list of audit entries order chronologically descending, using page number.
func ReadRecentAudit(instanceKey *InstanceKey, page int) ([]Audit, error) {
	res := []Audit{}
	args := sqlutils.Args()
	whereCondition := ``
	if instanceKey != nil {
		whereCondition = `where hostname=? and port=?`
		args = append(args, instanceKey.Hostname, instanceKey.Port)
	}
	query := fmt.Sprintf(`
		select 
			audit_id,
			audit_timestamp,
			audit_type,
			hostname,
			port,
			message
		from 
			audit
		%s
		order by
			audit_timestamp desc
		limit ?
		offset ?
		`, whereCondition)
	args = append(args, config.Config.AuditPageSize, page*config.Config.AuditPageSize)
	err := db.QueryOrchestrator(query, args, func(m sqlutils.RowMap) error {
		audit := Audit{}
		audit.AuditId = m.GetInt64("audit_id")
		audit.AuditTimestamp = m.GetString("audit_timestamp")
		audit.AuditType = m.GetString("audit_type")
		audit.AuditInstanceKey.Hostname = m.GetString("hostname")
		audit.AuditInstanceKey.Port = m.GetInt("port")
		audit.Message = m.GetString("message")

		res = append(res, audit)
		return nil
	})

	if err != nil {
		log.Errore(err)
	}
	return res, err

}