// Copyright 2019 Yunion
//
// 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.

package models

import (
	"context"
	"database/sql"
	"strconv"
	"time"

	"yunion.io/x/jsonutils"
	"yunion.io/x/log"
	"yunion.io/x/pkg/errors"
	"yunion.io/x/sqlchemy"

	api "yunion.io/x/onecloud/pkg/apis/compute"
	"yunion.io/x/onecloud/pkg/cloudcommon/db"
	"yunion.io/x/onecloud/pkg/httperrors"
	"yunion.io/x/onecloud/pkg/mcclient"
	"yunion.io/x/onecloud/pkg/util/stringutils2"
)

type SReservedipManager struct {
	db.SResourceBaseManager
	SNetworkResourceBaseManager
}

var ReservedipManager *SReservedipManager

func init() {
	ReservedipManager = &SReservedipManager{
		SResourceBaseManager: db.NewResourceBaseManager(
			SReservedip{},
			api.RESERVEDIP_TABLE,
			api.RESERVEDIP_RESOURCE_TYPE,
			api.RESERVEDIP_RESOURCE_TYPES,
		),
	}
	ReservedipManager.SetVirtualObject(ReservedipManager)
}

type SReservedip struct {
	db.SResourceBase
	SNetworkResourceBase `width:"36" charset:"ascii" nullable:"false" list:"admin"`

	// 自增Id
	Id int64 `primary:"true" auto_increment:"true" list:"admin"`

	// IP子网Id
	// NetworkId string `width:"36" charset:"ascii" nullable:"false" list:"admin"`

	// IP地址
	IpAddr string `width:"16" charset:"ascii" list:"admin"`

	// 预留原因或描述
	Notes string `width:"512" charset:"utf8" nullable:"true" list:"admin" update:"admin"`

	// 过期时间
	ExpiredAt time.Time `nullable:"true" list:"admin"`

	// 状态
	Status string `width:"12" charset:"ascii" nullable:"false" default:"unknown" list:"admin" create:"admin_optional" update:"admin"`
}

func (manager *SReservedipManager) AllowListItems(ctx context.Context, userCred mcclient.TokenCredential, query jsonutils.JSONObject) bool {
	return db.IsAdminAllowList(userCred, manager)
}

func (manager *SReservedipManager) AllowCreateItem(ctx context.Context, userCred mcclient.TokenCredential, query jsonutils.JSONObject, data jsonutils.JSONObject) bool {
	return false
}

func (self *SReservedip) AllowGetDetails(ctx context.Context, userCred mcclient.TokenCredential, query jsonutils.JSONObject) bool {
	return false
}

func (self *SReservedip) AllowUpdateItem(ctx context.Context, userCred mcclient.TokenCredential) bool {
	return false
}

func (self *SReservedip) AllowDeleteItem(ctx context.Context, userCred mcclient.TokenCredential, query jsonutils.JSONObject, data jsonutils.JSONObject) bool {
	return false
}

func (manager *SReservedipManager) ReserveIP(userCred mcclient.TokenCredential, network *SNetwork, ip string, notes string) error {
	return manager.ReserveIPWithDuration(userCred, network, ip, notes, 0)
}

func (manager *SReservedipManager) ReserveIPWithDuration(userCred mcclient.TokenCredential, network *SNetwork, ip string, notes string, duration time.Duration) error {
	return manager.ReserveIPWithDurationAndStatus(userCred, network, ip, notes, duration, "")
}

func (manager *SReservedipManager) ReserveIPWithDurationAndStatus(userCred mcclient.TokenCredential, network *SNetwork, ip string, notes string, duration time.Duration, status string) error {
	expiredAt := time.Time{}
	if duration > 0 {
		expiredAt = time.Now().UTC().Add(duration)
	}
	rip := manager.getReservedIP(network, ip)
	if rip == nil {
		rip := SReservedip{IpAddr: ip, Notes: notes, ExpiredAt: expiredAt, Status: status}
		rip.NetworkId = network.Id
		err := manager.TableSpec().Insert(&rip)
		if err != nil {
			log.Errorf("ReserveIP fail: %s", err)
			return errors.Wrap(err, "Insert")
		}
	} else if rip.IsExpired() {
		_, err := db.Update(rip, func() error {
			rip.Notes = notes
			rip.ExpiredAt = expiredAt
			if len(status) > 0 {
				rip.Status = status
			}
			return nil
		})
		if err != nil {
			return errors.Wrap(err, "Update")
		}
	} else {
		return errors.Wrapf(httperrors.ErrConflict, "Address %s has been reserved", ip)
	}
	db.OpsLog.LogEvent(network, db.ACT_RESERVE_IP, ip, userCred)
	return nil
}

func (manager *SReservedipManager) getReservedIP(network *SNetwork, ip string) *SReservedip {
	rip := SReservedip{}
	rip.SetModelManager(manager, &rip)

	q := manager.Query().Equals("network_id", network.Id).Equals("ip_addr", ip)
	err := q.First(&rip)
	if err != nil {
		if errors.Cause(err) != sql.ErrNoRows {
			log.Errorf("GetReservedIP fail: %s", err)
		}
		return nil
	}
	return &rip
}

func (manager *SReservedipManager) GetReservedIP(network *SNetwork, ip string) *SReservedip {
	rip := manager.getReservedIP(network, ip)
	if rip == nil {
		log.Errorf("GetReserved IP %s: not found", ip)
		return nil
	}
	if rip.IsExpired() {
		log.Errorf("GetReserved IP %s: expired", ip)
		return nil
	}
	return rip
}

func (manager *SReservedipManager) GetReservedIPs(network *SNetwork) []SReservedip {
	rips := make([]SReservedip, 0)
	now := time.Now().UTC()
	q := manager.Query().Equals("network_id", network.Id).GT("expired_at", now)
	err := db.FetchModelObjects(manager, q, &rips)
	if err != nil {
		log.Errorf("GetReservedIPs fail: %s", err)
		return nil
	}
	return rips
}

func (self *SReservedip) GetNetwork() *SNetwork {
	net, _ := NetworkManager.FetchById(self.NetworkId)
	if net != nil {
		return net.(*SNetwork)
	}
	return nil
}

func (self *SReservedip) Release(ctx context.Context, userCred mcclient.TokenCredential, network *SNetwork) error {
	// db.DeleteModel(self.ResourceModelManager(), self)
	if network == nil {
		network = self.GetNetwork()
	}
	err := db.DeleteModel(ctx, userCred, self)
	if err == nil && network != nil {
		db.OpsLog.LogEvent(network, db.ACT_RELEASE_IP, self.IpAddr, userCred)
	}
	return err
}

func (self *SReservedip) GetExtraDetails(ctx context.Context, userCred mcclient.TokenCredential, query jsonutils.JSONObject, isList bool) (api.ReservedipDetails, error) {
	return api.ReservedipDetails{}, nil
}

func (manager *SReservedipManager) FetchCustomizeColumns(
	ctx context.Context,
	userCred mcclient.TokenCredential,
	query jsonutils.JSONObject,
	objs []interface{},
	fields stringutils2.SSortedStrings,
	isList bool,
) []api.ReservedipDetails {
	rows := make([]api.ReservedipDetails, len(objs))

	resRows := manager.SResourceBaseManager.FetchCustomizeColumns(ctx, userCred, query, objs, fields, isList)
	netRows := manager.SNetworkResourceBaseManager.FetchCustomizeColumns(ctx, userCred, query, objs, fields, isList)

	for i := range rows {
		rows[i] = api.ReservedipDetails{
			ResourceBaseDetails: resRows[i],
			NetworkResourceInfo: netRows[i],
		}
		rows[i].Expired = objs[i].(*SReservedip).IsExpired()
	}

	return rows
}

// 预留IP地址列表
func (manager *SReservedipManager) ListItemFilter(
	ctx context.Context,
	q *sqlchemy.SQuery,
	userCred mcclient.TokenCredential,
	query api.ReservedipListInput,
) (*sqlchemy.SQuery, error) {
	var err error

	q, err = manager.SResourceBaseManager.ListItemFilter(ctx, q, userCred, query.ResourceBaseListInput)
	if err != nil {
		return nil, errors.Wrap(err, "SResourceBaseManager.ListItemFilter")
	}
	q, err = manager.SNetworkResourceBaseManager.ListItemFilter(ctx, q, userCred, query.NetworkFilterListInput)
	if err != nil {
		return nil, errors.Wrap(err, "SNetworkResourceBaseManager.ListItemFilter")
	}

	if query.All == nil || *query.All == false {
		q = q.Filter(sqlchemy.OR(
			sqlchemy.IsNullOrEmpty(q.Field("expired_at")),
			sqlchemy.GT(q.Field("expired_at"), time.Now().UTC()),
		))
	}

	if len(query.IpAddr) > 0 {
		q = q.In("ip_addr", query.IpAddr)
	}
	if len(query.Status) > 0 {
		q = q.In("status", query.Status)
	}

	return q, nil
}

func (manager *SReservedipManager) OrderByExtraFields(
	ctx context.Context,
	q *sqlchemy.SQuery,
	userCred mcclient.TokenCredential,
	query api.ReservedipListInput,
) (*sqlchemy.SQuery, error) {
	var err error

	q, err = manager.SResourceBaseManager.OrderByExtraFields(ctx, q, userCred, query.ResourceBaseListInput)
	if err != nil {
		return nil, errors.Wrap(err, "SResourceBaseManager.OrderByExtraFields")
	}

	q, err = manager.SNetworkResourceBaseManager.OrderByExtraFields(ctx, q, userCred, query.NetworkFilterListInput)
	if err != nil {
		return nil, errors.Wrap(err, "SNetworkResourceBaseManager.OrderByExtraFields")
	}

	return q, nil
}

func (manager *SReservedipManager) QueryDistinctExtraField(q *sqlchemy.SQuery, field string) (*sqlchemy.SQuery, error) {
	var err error

	q, err = manager.SResourceBaseManager.QueryDistinctExtraField(q, field)
	if err == nil {
		return q, nil
	}
	q, err = manager.SNetworkResourceBaseManager.QueryDistinctExtraField(q, field)
	if err == nil {
		return q, nil
	}

	return q, httperrors.ErrNotFound
}

func (rip *SReservedip) GetId() string {
	return strconv.FormatInt(rip.Id, 10)
}

func (rip *SReservedip) GetName() string {
	return rip.GetId()
}

func (manager *SReservedipManager) FilterById(q *sqlchemy.SQuery, idStr string) *sqlchemy.SQuery {
	return q.Equals("id", idStr)
}

func (manager *SReservedipManager) FilterByName(q *sqlchemy.SQuery, name string) *sqlchemy.SQuery {
	return q.Equals("id", name)
}

func (rip *SReservedip) IsExpired() bool {
	if !rip.ExpiredAt.IsZero() && rip.ExpiredAt.Before(time.Now()) {
		return true
	}
	return false
}