/*
   Copyright (c) 2021 AT&T Intellectual Property.
   Copyright (c) 2018-2021 Nokia.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

/*
 * This source code is part of the near-RT RIC (RAN Intelligent Controller)
 * platform project (RICP).
 */

package sdlgoredis

import (
	"fmt"
)

//DbState struct is a holder for DB state information, which is received from
//sdlgoredis sentinel 'Master' and 'Slaves' calls output.
type DbState struct {
	MasterDbState    MasterDbState
	ReplicasDbState  *ReplicasDbState
	SentinelsDbState *SentinelsDbState
}

//MasterDbState struct is a holder for master Redis state information.
type MasterDbState struct {
	Err    error
	Fields MasterDbStateFields
}

//ReplicasDbState struct is a holder for Redis slaves state information.
type ReplicasDbState struct {
	Err    error
	States []*ReplicaDbState
}

//ReplicaDbState struct is a holder for one Redis slave state information.
type ReplicaDbState struct {
	Fields ReplicaDbStateFields
}

//SentinelsDbState struct is a holder for Redis sentinels state information.
type SentinelsDbState struct {
	Err    error
	States []*SentinelDbState
}

//SentinelDbState struct is a holder for one Redis sentinel state information.
type SentinelDbState struct {
	Fields SentinelDbStateFields
}

//MasterDbStateFields struct is a holder for master Redis state information
//fields which are read from sdlgoredis sentinel 'Master' call output.
type MasterDbStateFields struct {
	Role  string
	Ip    string
	Port  string
	Flags string
}

//ReplicaDbStateFields struct is a holder for slave Redis state information
//fields which are read from sdlgoredis sentinel 'Slaves' call output.
type ReplicaDbStateFields struct {
	Role             string
	Ip               string
	Port             string
	MasterLinkStatus string
	Flags            string
}

//SentinelDbStateFields struct is a holder for sentinel Redis state information
//fields which are read from sdlgoredis sentinel 'Sentinels' call output.
type SentinelDbStateFields struct {
	Ip    string
	Port  string
	Flags string
}

func (dbst *DbState) IsOnline() error {
	if err := dbst.MasterDbState.IsOnline(); err != nil {
		return err
	}
	if dbst.ReplicasDbState != nil {
		if err := dbst.ReplicasDbState.IsOnline(); err != nil {
			return err
		}
	}
	if dbst.SentinelsDbState != nil {
		if err := dbst.SentinelsDbState.IsOnline(); err != nil {
			return err
		}
	}
	return nil
}

func (mdbst *MasterDbState) IsOnline() error {
	if mdbst.Err != nil {
		return mdbst.Err
	}
	if mdbst.Fields.Role != "master" {
		return fmt.Errorf("No master DB, current role '%s'", mdbst.Fields.Role)
	}
	if mdbst.Fields.Flags != "master" {
		return fmt.Errorf("Master flags are '%s', expected 'master'", mdbst.Fields.Flags)
	}
	return nil
}

func (mdbst *MasterDbState) GetAddress() string {
	if mdbst.Fields.Ip != "" || mdbst.Fields.Port != "" {
		return mdbst.Fields.Ip + ":" + mdbst.Fields.Port
	} else {
		return ""
	}
}

func (rdbst *ReplicasDbState) IsOnline() error {
	if rdbst.Err != nil {
		return rdbst.Err
	}
	for _, state := range rdbst.States {
		if err := state.IsOnline(); err != nil {
			return err
		}
	}
	return nil
}

func (rdbst *ReplicaDbState) IsOnline() error {
	if rdbst.Fields.Role != "slave" {
		return fmt.Errorf("Replica role is '%s', expected 'slave'", rdbst.Fields.Role)
	}

	if rdbst.Fields.MasterLinkStatus != "ok" {
		return fmt.Errorf("Replica link to the master is down")
	}

	if rdbst.Fields.Flags != "slave" {
		return fmt.Errorf("Replica flags are '%s', expected 'slave'", rdbst.Fields.Flags)
	}
	return nil
}

func (rdbst *ReplicaDbState) GetAddress() string {
	if rdbst.Fields.Ip != "" || rdbst.Fields.Port != "" {
		return rdbst.Fields.Ip + ":" + rdbst.Fields.Port
	} else {
		return ""
	}
}

func (sdbst *SentinelsDbState) IsOnline() error {
	if sdbst.Err != nil {
		return sdbst.Err
	}
	for _, state := range sdbst.States {
		if err := state.IsOnline(); err != nil {
			return err
		}
	}
	return nil
}

func (sdbst *SentinelDbState) IsOnline() error {
	if sdbst.Fields.Flags != "sentinel" {
		return fmt.Errorf("Sentinel flags are '%s', expected 'sentinel'", sdbst.Fields.Flags)
	}
	return nil
}

func (sdbst *SentinelDbState) GetAddress() string {
	if sdbst.Fields.Ip != "" || sdbst.Fields.Port != "" {
		return sdbst.Fields.Ip + ":" + sdbst.Fields.Port
	} else {
		return ""
	}
}