package tc

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import (
	"database/sql"
	"errors"
	"strings"

	"github.com/apache/trafficcontrol/lib/go-util"
)

// A SteeringTarget is a relationship between a Steering Delivery Service and
// another Delivery Service which is one of its Targets.
//
// Deprecated: As far as this author is aware, this structure has never served
// any purpose. Modelling the Steering Target/Delivery Service relationship is
// better accomplished by the SteeringTargetNullable type.
type SteeringTarget struct {
	DeliveryService   DeliveryServiceName `json:"deliveryService" db:"deliveryservice_name"`
	DeliveryServiceID int                 `json:"deliveryServiceId" db:"deliveryservice"`
	Target            DeliveryServiceName `json:"target" db:"target_name"`
	TargetID          int                 `json:"targetId" db:"target"`
	Type              string              `json:"type" db:"type"`      // TODO enum?
	TypeID            int                 `json:"typeId" db:"type_id"` // TODO enum?
	Value             util.JSONIntStr     `json:"value" db:"value"`
}

// A SteeringTargetNullable is a relationship between a Steering Delivery
// Service and another Delivery Service which is one of its Targets.
type SteeringTargetNullable struct {
	DeliveryService   *DeliveryServiceName `json:"deliveryService" db:"deliveryservice_name"`
	DeliveryServiceID *uint64              `json:"deliveryServiceId" db:"deliveryservice"`
	Target            *DeliveryServiceName `json:"target" db:"target_name"`
	TargetID          *uint64              `json:"targetId" db:"target"`
	Type              *string              `json:"type" db:"type_name"` // TODO enum?
	TypeID            *int                 `json:"typeId" db:"type_id"` // TODO enum?
	Value             *util.JSONIntStr     `json:"value" db:"value"`
}

// Validate implements the
// github.com/apache/trafficcontrol/traffic_ops/traffic_ops_golang/api.ParseValidator
// interface.
func (st SteeringTargetNullable) Validate(tx *sql.Tx) (error, error) {
	errs := []string{}
	if st.TypeID == nil {
		errs = append(errs, "missing typeId")
	}
	valid, err := ValidateTypeID(tx, st.TypeID, "steering_target")
	if valid == "" {
		errs = append(errs, err.Error())
	}
	if st.Value == nil {
		errs = append(errs, "missing value")
	}
	if len(errs) > 0 {
		return errors.New(strings.Join(errs, "; ")), nil
	}
	return nil, nil
}

// SteeringTargetsResponse is the type of a response from Traffic Ops to its
// /steering/{{ID}}/targets endpoint.
type SteeringTargetsResponse struct {
	Response []SteeringTargetNullable `json:"response"`
	Alerts
}