// 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
}

func ReadAvailableNodes(onlyHttpNodes bool) ([]string, error) {
	res := []string{}
	extraInfo := ""
	if onlyHttpNodes {
		extraInfo = string(OrchestratorExecutionHttpMode)
	}
	query := `
		select
			concat(hostname, ';', token, ';', app_version) 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
}

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

}

// 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
}

func getHostAttributesByClause(whereClause string, args []interface{}) ([]HostAttributes, error) {
	res := []HostAttributes{}
	query := fmt.Sprintf(`
		select 
			hostname, 
			attribute_name, 
			attribute_value,
			submit_timestamp ,
			ifnull(expire_timestamp, '') as expire_timestamp  
		from 
			host_attributes
		%s
		order by
			hostname, attribute_name
		`, whereClause)

	err := db.QueryOrchestrator(query, args, func(m sqlutils.RowMap) error {
		hostAttributes := HostAttributes{}
		hostAttributes.Hostname = m.GetString("hostname")
		hostAttributes.AttributeName = m.GetString("attribute_name")
		hostAttributes.AttributeValue = m.GetString("attribute_value")
		hostAttributes.SubmitTimestamp = m.GetString("submit_timestamp")
		hostAttributes.ExpireTimestamp = m.GetString("expire_timestamp")

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

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

}

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
}

// readRecoveries reads recovery entry/audit entires from topology_recovery
func readFailureDetections(whereCondition string, limit string, args []interface{}) ([]TopologyRecovery, error) {
	res := []TopologyRecovery{}
	query := fmt.Sprintf(`
		select
            detection_id,
            hostname,
            port,
            in_active_period as is_active,
            start_active_period,
            end_active_period_unixtime,
            processing_node_hostname,
            processcing_node_token,
            analysis,
            cluster_name,
            cluster_alias,
            count_affected_slaves,
            slave_hosts,
            (select max(recovery_id) from topology_recovery where topology_recovery.last_detection_id = detection_id) as related_recovery_id
		from
			topology_failure_detection
		%s
		order by
			detection_id desc
		%s
		`, whereCondition, limit)
	err := db.QueryOrchestrator(query, args, func(m sqlutils.RowMap) error {
		failureDetection := TopologyRecovery{}
		failureDetection.Id = m.GetInt64("detection_id")

		failureDetection.IsActive = m.GetBool("is_active")
		failureDetection.RecoveryStartTimestamp = m.GetString("start_active_period")
		failureDetection.ProcessingNodeHostname = m.GetString("processing_node_hostname")
		failureDetection.ProcessingNodeToken = m.GetString("processcing_node_token")

		failureDetection.AnalysisEntry.AnalyzedInstanceKey.Hostname = m.GetString("hostname")
		failureDetection.AnalysisEntry.AnalyzedInstanceKey.Port = m.GetInt("port")
		failureDetection.AnalysisEntry.Analysis = inst.AnalysisCode(m.GetString("analysis"))
		failureDetection.AnalysisEntry.ClusterDetails.ClusterName = m.GetString("cluster_name")
		failureDetection.AnalysisEntry.ClusterDetails.ClusterAlias = m.GetString("cluster_alias")
		failureDetection.AnalysisEntry.CountSlaves = m.GetUint("count_affected_slaves")
		failureDetection.AnalysisEntry.ReadSlaveHostsFromString(m.GetString("slave_hosts"))

		failureDetection.RelatedRecoveryId = m.GetInt64("related_recovery_id")

		failureDetection.AnalysisEntry.ClusterDetails.ReadRecoveryInfo()

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

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

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
}

// ReadAliasByClusterName returns the cluster alias for the given cluster name,
// or the cluster name itself if not explicit alias found
func ReadAliasByClusterName(clusterName string) (alias string, err error) {
	alias = clusterName // default return value
	query := `
		select
			alias
		from
			cluster_alias
		where
			cluster_name = ?
		`
	err = db.QueryOrchestrator(query, sqlutils.Args(clusterName), func(m sqlutils.RowMap) error {
		alias = m.GetString("alias")
		return nil
	})
	return clusterName, err
}

// 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

}

// TokenIsValid checks to see whether a given token exists and is not outdated.
func TokenIsValid(publicToken string, secretToken string) (result bool, err error) {
	query := `
		select
				count(*) as valid_token
			from
				access_token
		  where
				public_token=?
				and secret_token=?
				and (
					generated_at >= now() - interval ? minute
					or is_reentrant = 1
				)
		`
	err = db.QueryOrchestrator(query, sqlutils.Args(publicToken, secretToken, config.Config.AccessTokenExpiryMinutes), func(m sqlutils.RowMap) error {
		result = m.GetInt("valid_token") > 0
		return nil
	})
	return result, log.Errore(err)
}

func TokenBelongsToHealthyHttpService(token string) (result bool, err error) {
	extraInfo := string(OrchestratorExecutionHttpMode)

	query := `
		select
			token
		from
			node_health
		where
			and token = ?
			and extra_info = ?
		`

	err = db.QueryOrchestrator(query, sqlutils.Args(token, extraInfo), func(m sqlutils.RowMap) error {
		// Row exists? We're happy
		result = true
		return nil
	})
	return result, log.Errore(err)
}

// ReadOutdatedAgentsHosts returns agents that need to be updated
func ReadOutdatedAgentsHosts() ([]string, error) {
	res := []string{}
	query := `
		select 
			hostname 
		from 
			host_agent 
		where
			IFNULL(last_checked < now() - interval ? minute, true)
			`
	err := db.QueryOrchestrator(query, sqlutils.Args(config.Config.AgentPollMinutes), func(m sqlutils.RowMap) error {
		hostname := m.GetString("hostname")
		res = append(res, hostname)
		return nil
	})

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

// ReadClusterPoolInstances reads cluster-pool-instance associationsfor given cluster and pool
func ReadClusterPoolInstances(clusterName string, pool string) (result [](*ClusterPoolInstance), err error) {
	args := sqlutils.Args()
	whereClause := ``
	if clusterName != "" {
		whereClause = `
			where
				database_instance.cluster_name = ?
				and ? in ('', pool)
		`
		args = append(args, clusterName, pool)
	}
	query := fmt.Sprintf(`
		select
			cluster_name,
			ifnull(alias, cluster_name) as alias,
			database_instance_pool.*
		from
			database_instance
			join database_instance_pool using (hostname, port)
			left join cluster_alias using (cluster_name)
		%s
		`, whereClause)
	err = db.QueryOrchestrator(query, args, func(m sqlutils.RowMap) error {
		clusterPoolInstance := ClusterPoolInstance{
			ClusterName:  m.GetString("cluster_name"),
			ClusterAlias: m.GetString("alias"),
			Pool:         m.GetString("pool"),
			Hostname:     m.GetString("hostname"),
			Port:         m.GetInt("port"),
		}
		result = append(result, &clusterPoolInstance)
		return nil
	})

	if err != nil {
		return nil, err
	}

	return result, nil
}

// ReadBlockedRecoveries reads blocked recovery entries, potentially filtered by cluster name (empty to unfilter)
func ReadBlockedRecoveries(clusterName string) ([]BlockedTopologyRecovery, error) {
	res := []BlockedTopologyRecovery{}
	whereClause := ""
	args := sqlutils.Args()
	if clusterName != "" {
		whereClause = `where cluster_name = ?`
		args = append(args, clusterName)
	}
	query := fmt.Sprintf(`
		select
				hostname,
				port,
				cluster_name,
				analysis,
				last_blocked_timestamp,
				blocking_recovery_id
			from
				blocked_topology_recovery
			%s
			order by
				last_blocked_timestamp desc
		`, whereClause)
	err := db.QueryOrchestrator(query, args, func(m sqlutils.RowMap) error {
		blockedTopologyRecovery := BlockedTopologyRecovery{}
		blockedTopologyRecovery.FailedInstanceKey.Hostname = m.GetString("hostname")
		blockedTopologyRecovery.FailedInstanceKey.Port = m.GetInt("port")
		blockedTopologyRecovery.ClusterName = m.GetString("cluster_name")
		blockedTopologyRecovery.Analysis = inst.AnalysisCode(m.GetString("analysis"))
		blockedTopologyRecovery.LastBlockedTimestamp = m.GetString("last_blocked_timestamp")
		blockedTopologyRecovery.BlockingRecoveryId = m.GetInt64("blocking_recovery_id")

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

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

// ReadClusterNameByAlias
func ReadClusterNameByAlias(alias string) (clusterName string, err error) {
	query := `
		select
			cluster_name
		from
			cluster_alias
		where
			alias = ?
			or cluster_name = ?
		`
	err = db.QueryOrchestrator(query, sqlutils.Args(alias, alias), func(m sqlutils.RowMap) error {
		clusterName = m.GetString("cluster_name")
		return nil
	})
	if err != nil {
		return "", err
	}
	if clusterName == "" {
		err = fmt.Errorf("No cluster found for alias %s", alias)
	}
	return clusterName, err
}

// AcquireAccessToken attempts to acquire a hopefully free token; returning in such case
// the secretToken as proof of ownership.
func AcquireAccessToken(publicToken string) (secretToken string, err error) {
	secretToken = ""
	sqlResult, err := db.ExecOrchestrator(`
			update access_token
				set
					is_acquired=1,
					acquired_at=now()
				where
					public_token=?
					and (
						(
							is_acquired=0
							and generated_at > now() - interval ? second
						)
						or is_reentrant=1
					)
			`,
		publicToken, config.Config.AccessTokenUseExpirySeconds,
	)
	if err != nil {
		return secretToken, log.Errore(err)
	}
	rows, err := sqlResult.RowsAffected()
	if err != nil {
		return secretToken, log.Errore(err)
	}
	if rows == 0 {
		return secretToken, log.Errorf("Cannot acquire token %s", publicToken)
	}
	// Seems like we made it!
	query := `
		select secret_token from access_token where public_token=?
		`
	err = db.QueryOrchestrator(query, sqlutils.Args(publicToken), func(m sqlutils.RowMap) error {
		secretToken = m.GetString("secret_token")
		return nil
	})
	return secretToken, log.Errore(err)
}

// ReadClusterDomainName reads the domain name associated with a cluster, if any
func ReadClusterDomainName(clusterName string) (string, error) {
	domainName := ""
	query := `
		select 
			domain_name
		from 
			cluster_domain_name
		where
			cluster_name = ?
		`
	err := db.QueryOrchestrator(query, sqlutils.Args(clusterName), func(m sqlutils.RowMap) error {
		domainName = m.GetString("domain_name")
		return nil
	})
	if err != nil {
		return "", err
	}
	if domainName == "" {
		err = fmt.Errorf("No domain name found for cluster %s", clusterName)
	}
	return domainName, err

}