// 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"

	"yunion.io/x/jsonutils"
	"yunion.io/x/log"
	"yunion.io/x/pkg/errors"
	"yunion.io/x/pkg/util/reflectutils"
	"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 SStorageResourceBase struct {
	StorageId string `width:"36" charset:"ascii" nullable:"true" list:"user" index:"true" create:"optional"`
}

type SStorageResourceBaseManager struct {
	SZoneResourceBaseManager
	SManagedResourceBaseManager
}

func ValidateStorageResourceInput(ctx context.Context, userCred mcclient.TokenCredential, query api.StorageResourceInput) (*SStorage, api.StorageResourceInput, error) {
	storageObj, err := StorageManager.FetchByIdOrName(ctx, userCred, query.StorageId)
	if err != nil {
		if err == sql.ErrNoRows {
			return nil, query, errors.Wrapf(httperrors.ErrResourceNotFound, "%s %s", StorageManager.Keyword(), query.StorageId)
		} else {
			return nil, query, errors.Wrap(err, "StorageManager.FetchByIdOrName")
		}
	}
	query.StorageId = storageObj.GetId()
	return storageObj.(*SStorage), query, nil
}

func (self *SStorageResourceBase) GetStorage() *SStorage {
	obj, err := StorageManager.FetchById(self.StorageId)
	if err != nil {
		log.Errorf("fail to fetch storage by id: %s: %s", self.StorageId, err)
		return nil
	}
	return obj.(*SStorage)
}

func (manager *SStorageResourceBaseManager) FetchCustomizeColumns(
	ctx context.Context,
	userCred mcclient.TokenCredential,
	query jsonutils.JSONObject,
	objs []interface{},
	fields stringutils2.SSortedStrings,
	isList bool,
) []api.StorageResourceInfo {
	rows := make([]api.StorageResourceInfo, len(objs))
	storageIds := make([]string, len(objs))
	for i := range objs {
		var base *SStorageResourceBase
		reflectutils.FindAnonymouStructPointer(objs[i], &base)
		if base != nil {
			storageIds[i] = base.StorageId
		}
	}

	storages := make(map[string]SStorage)
	err := db.FetchStandaloneObjectsByIds(StorageManager, storageIds, storages)
	if err != nil {
		log.Errorf("FetchStandaloneObjectsByIds fail %s", err)
		return nil
	}

	zoneList := make([]interface{}, len(rows))
	managerList := make([]interface{}, len(rows))

	for i := range rows {
		rows[i] = api.StorageResourceInfo{}
		if _, ok := storages[storageIds[i]]; ok {
			storage := storages[storageIds[i]]
			rows[i].Storage = storage.Name
			rows[i].StorageStatus = storage.Status
			rows[i].StorageType = storage.StorageType
			rows[i].MediumType = storage.MediumType
			rows[i].ManagerId = storage.ManagerId
			rows[i].ZoneId = storage.ZoneId
		}
		zoneList[i] = &SZoneResourceBase{rows[i].ZoneId}
		managerList[i] = &SManagedResourceBase{rows[i].ManagerId}
	}

	zoneRows := manager.SZoneResourceBaseManager.FetchCustomizeColumns(ctx, userCred, query, zoneList, fields, isList)
	managerRows := manager.SManagedResourceBaseManager.FetchCustomizeColumns(ctx, userCred, query, managerList, fields, isList)
	for i := range rows {
		rows[i].ZoneResourceInfo = zoneRows[i]
		rows[i].ManagedResourceInfo = managerRows[i]
	}

	return rows
}

func (manager *SStorageResourceBaseManager) ListItemFilter(
	ctx context.Context,
	q *sqlchemy.SQuery,
	userCred mcclient.TokenCredential,
	query api.StorageFilterListInput,
) (*sqlchemy.SQuery, error) {
	if len(query.StorageId) > 0 {
		storageObj, _, err := ValidateStorageResourceInput(ctx, userCred, query.StorageResourceInput)
		if err != nil {
			return nil, errors.Wrap(err, "ValidateStorageResourceInput")
		}
		q = q.Equals("storage_id", storageObj.GetId())
	}
	if len(query.StorageHostId) > 0 {
		hostInput := api.HostResourceInput{}
		hostInput.HostId = query.StorageHostId
		var err error
		_, hostInput, err = ValidateHostResourceInput(ctx, userCred, hostInput)
		if err != nil {
			return nil, errors.Wrap(err, "ValidateHostResourceInput")
		}
		hostStoragesQ := HoststorageManager.Query().Equals("host_id", hostInput.HostId).SubQuery()
		q = q.Join(hostStoragesQ, sqlchemy.Equals(q.Field("storage_id"), hostStoragesQ.Field("storage_id")))
	}
	subq := StorageManager.Query("id").Snapshot()
	subq, err := manager.SZoneResourceBaseManager.ListItemFilter(ctx, subq, userCred, query.ZonalFilterListInput)
	if err != nil {
		return nil, errors.Wrap(err, "SZoneResourceBaseManager.ListItemFilter")
	}
	subq, err = manager.SManagedResourceBaseManager.ListItemFilter(ctx, subq, userCred, query.ManagedResourceListInput)
	if err != nil {
		return nil, errors.Wrap(err, "SManagedResourceBaseManager.ListItemFilter")
	}
	if query.Share != nil && *query.Share {
		subq = subq.Filter(sqlchemy.NotIn(subq.Field("storage_type"), api.STORAGE_LOCAL_TYPES))
	}
	if query.Local != nil && *query.Local {
		subq = subq.Filter(sqlchemy.In(subq.Field("storage_type"), api.STORAGE_LOCAL_TYPES))
	}
	if subq.IsAltered() {
		q = q.Filter(sqlchemy.In(q.Field("storage_id"), subq.SubQuery()))
	}
	return q, nil
}

func (manager *SStorageResourceBaseManager) QueryDistinctExtraField(q *sqlchemy.SQuery, field string) (*sqlchemy.SQuery, error) {
	switch field {
	case "storage":
		storages := StorageManager.Query("name", "id").Distinct().SubQuery()
		q.AppendField(storages.Field("name", field))
		q = q.Join(storages, sqlchemy.Equals(q.Field("storage_id"), storages.Field("id")))
		q.GroupBy(storages.Field("name"))
		return q, nil
	case "storage_type", "medium_type":
		storages := StorageManager.Query(field, "id").Distinct().SubQuery()
		q.AppendField(storages.Field(field))
		q = q.Join(storages, sqlchemy.Equals(q.Field("storage_id"), storages.Field("id")))
		q.GroupBy(storages.Field(field))
		return q, nil
	case "manager", "account", "provider", "brand":
		storages := StorageManager.Query("id", "manager_id").SubQuery()
		q = q.LeftJoin(storages, sqlchemy.Equals(q.Field("storage_id"), storages.Field("id")))
		return manager.SManagedResourceBaseManager.QueryDistinctExtraField(q, field)
	default:
		storages := StorageManager.Query("id", "zone_id").SubQuery()
		q = q.LeftJoin(storages, sqlchemy.Equals(q.Field("storage_id"), storages.Field("id")))
		q, err := manager.SZoneResourceBaseManager.QueryDistinctExtraField(q, field)
		if err == nil {
			return q, nil
		}
	}
	return q, httperrors.ErrNotFound
}

func (manager *SStorageResourceBaseManager) OrderByExtraFields(
	ctx context.Context,
	q *sqlchemy.SQuery,
	userCred mcclient.TokenCredential,
	query api.StorageFilterListInput,
) (*sqlchemy.SQuery, error) {
	if !db.NeedOrderQuery(manager.GetOrderByFields(query)) {
		return q, nil
	}
	orderQ := StorageManager.Query("id")
	orderSubQ := orderQ.SubQuery()
	orderQ, orders, fields := manager.GetOrderBySubQuery(orderQ, orderSubQ, orderQ.Field("id"), userCred, query, nil, nil)
	q = q.LeftJoin(orderSubQ, sqlchemy.Equals(q.Field("storage_id"), orderSubQ.Field("id")))
	q = db.OrderByFields(q, orders, fields)
	return q, nil
}

func (manager *SStorageResourceBaseManager) GetOrderBySubQuery(
	q *sqlchemy.SQuery,
	subq *sqlchemy.SSubQuery,
	joinField sqlchemy.IQueryField,
	userCred mcclient.TokenCredential,
	query api.StorageFilterListInput,
	orders []string,
	fields []sqlchemy.IQueryField,
) (*sqlchemy.SQuery, []string, []sqlchemy.IQueryField) {
	if !db.NeedOrderQuery(manager.GetOrderByFields(query)) {
		return q, orders, fields
	}
	storageQ := StorageManager.Query().SubQuery()
	q = q.LeftJoin(storageQ, sqlchemy.Equals(joinField, storageQ.Field("id")))
	q = q.AppendField(storageQ.Field("name").Label("storage"))
	orders = append(orders, query.OrderByStorage)
	fields = append(fields, subq.Field("storage"))
	q, orders, fields = manager.SZoneResourceBaseManager.GetOrderBySubQuery(q, subq, storageQ.Field("storage_id"), userCred, query.ZonalFilterListInput, orders, fields)
	q, orders, fields = manager.SManagedResourceBaseManager.GetOrderBySubQuery(q, subq, storageQ.Field("manager_id"), userCred, query.ManagedResourceListInput, orders, fields)
	return q, orders, fields
}

func (manager *SStorageResourceBaseManager) GetOrderByFields(query api.StorageFilterListInput) []string {
	fields := make([]string, 0)
	zoneFields := manager.SZoneResourceBaseManager.GetOrderByFields(query.ZonalFilterListInput)
	fields = append(fields, zoneFields...)
	managerFields := manager.SManagedResourceBaseManager.GetOrderByFields(query.ManagedResourceListInput)
	fields = append(fields, managerFields...)
	fields = append(fields, query.OrderByStorage)
	return fields
}

func (manager *SStorageResourceBaseManager) ListItemExportKeys(ctx context.Context,
	q *sqlchemy.SQuery,
	userCred mcclient.TokenCredential,
	keys stringutils2.SSortedStrings,
) (*sqlchemy.SQuery, error) {
	if keys.ContainsAny(manager.GetExportKeys()...) {
		var err error
		subq := StorageManager.Query("id", "name", "zone_id", "manager_id").SubQuery()
		q = q.LeftJoin(subq, sqlchemy.Equals(q.Field("storage_id"), subq.Field("id")))
		if keys.Contains("storage") {
			q = q.AppendField(subq.Field("name", "storage"))
		}
		if keys.ContainsAny(manager.SZoneResourceBaseManager.GetExportKeys()...) {
			q, err = manager.SZoneResourceBaseManager.ListItemExportKeys(ctx, q, userCred, keys)
			if err != nil {
				return nil, errors.Wrap(err, "SZoneResourceBaseManager.ListItemExportKeys")
			}
		}
		if keys.ContainsAny(manager.SManagedResourceBaseManager.GetExportKeys()...) {
			q, err = manager.SManagedResourceBaseManager.ListItemExportKeys(ctx, q, userCred, keys)
			if err != nil {
				return nil, errors.Wrap(err, "SManagedResourceBaseManager.ListItemExportKeys")
			}
		}
	}
	return q, nil
}

func (manager *SStorageResourceBaseManager) GetExportKeys() []string {
	keys := []string{"storage"}
	keys = append(keys, manager.SZoneResourceBaseManager.GetExportKeys()...)
	keys = append(keys, manager.SManagedResourceBaseManager.GetExportKeys()...)
	return keys
}

func (model *SStorageResourceBase) GetChangeOwnerCandidateDomainIds() []string {
	storage := model.GetStorage()
	if storage != nil {
		return storage.GetChangeOwnerCandidateDomainIds()
	}
	return nil
}