/*
	Copyright NetFoundry, Inc.

	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

	https://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 db

import (
	"fmt"
	"github.com/google/uuid"
	"github.com/openziti/fabric/controller/xt"
	"github.com/openziti/foundation/storage/boltz"
	"github.com/openziti/foundation/util/stringz"
	"go.etcd.io/bbolt"
	"math"
	"testing"
	"time"
)

func Test_TerminatorStore(t *testing.T) {
	ctx := NewTestContext(t)
	defer ctx.Cleanup()

	xt.GlobalRegistry().RegisterFactory(&testStrategyFactory{})

	t.Run("test create invalid terminators", ctx.testCreateInvalidTerminators)
	t.Run("test create/delete terminators", ctx.testCreateTerminators)
	t.Run("test create/delete terminators", ctx.testLoadQueryTerminators)
	t.Run("test update terminators", ctx.testUpdateTerminators)
	t.Run("test delete terminators", ctx.testDeleteTerminators)
	t.Run("test patch terminators", ctx.testPatchTerminator)
}

func (ctx *TestContext) testCreateInvalidTerminators(t *testing.T) {
	ctx.NextTest(t)
	defer ctx.cleanupAll()

	terminator := &Terminator{
		Binding: uuid.New().String(),
		Address: uuid.New().String(),
		Service: uuid.New().String(),
		Router:  uuid.New().String(),
	}
	err := ctx.Update(terminator)
	ctx.EqualError(err, "cannot update terminator with blank id")

	terminator.Binding = ""
	err = ctx.Create(terminator)
	ctx.EqualError(err, "the value '' for 'binding' is invalid: binding is required")

	terminator.Binding = uuid.New().String()
	terminator.Address = ""
	err = ctx.Create(terminator)
	ctx.EqualError(err, "the value '' for 'address' is invalid: address is required")

	terminator.Router = ""
	terminator.Address = uuid.New().String()
	err = ctx.Create(terminator)
	ctx.EqualError(err, "the value '' for 'router' is invalid: router is required")

	terminator.Service = ""
	terminator.Router = uuid.New().String()
	err = ctx.Create(terminator)
	ctx.EqualError(err, "the value '' for 'service' is invalid: service is required")

	service := ctx.requireNewService()
	router := ctx.requireNewRouter()

	terminator.Service = uuid.New().String()
	terminator.Router = router.Id
	err = ctx.Create(terminator)
	ctx.EqualError(err, fmt.Sprintf("service with id %v not found", terminator.Service))

	terminator.Service = service.Id
	terminator.Router = uuid.New().String()
	err = ctx.Create(terminator)
	ctx.EqualError(err, fmt.Sprintf("router with id %v not found", terminator.Router))
}

type terminatorTestEntities struct {
	service  *Service
	service2 *Service

	router  *Router
	router2 *Router

	terminator  *Terminator
	terminator2 *Terminator
	terminator3 *Terminator
}

func (ctx *TestContext) createTestTerminators() *terminatorTestEntities {
	e := &terminatorTestEntities{}

	e.service = ctx.requireNewService()
	e.router = ctx.requireNewRouter()

	e.terminator = &Terminator{}
	e.terminator.Service = e.service.Id
	e.terminator.Router = e.router.Id
	e.terminator.Binding = uuid.New().String()
	e.terminator.Address = uuid.New().String()
	e.terminator.Cost = 0
	ctx.RequireCreate(e.terminator)

	e.router2 = ctx.requireNewRouter()

	e.terminator2 = &Terminator{}
	e.terminator2.Service = e.service.Id
	e.terminator2.Router = e.router2.Id
	e.terminator2.Binding = uuid.New().String()
	e.terminator2.Address = uuid.New().String()
	e.terminator2.Cost = 100
	ctx.RequireCreate(e.terminator2)

	e.service2 = ctx.requireNewService()

	e.terminator3 = &Terminator{}
	e.terminator3.Service = e.service2.Id
	e.terminator3.Router = e.router2.Id
	e.terminator3.Binding = uuid.New().String()
	e.terminator3.Address = uuid.New().String()
	e.terminator3.Cost = math.MaxUint16
	ctx.RequireCreate(e.terminator3)

	return e
}

func (ctx *TestContext) testCreateTerminators(t *testing.T) {
	ctx.NextTest(t)
	defer ctx.cleanupAll()

	e := ctx.createTestTerminators()

	ctx.ValidateBaseline(e.terminator)
	ctx.ValidateBaseline(e.terminator2)
	ctx.ValidateBaseline(e.terminator3)

	terminatorIds := ctx.GetRelatedIds(e.service, EntityTypeTerminators)
	ctx.EqualValues(2, len(terminatorIds))
	ctx.True(stringz.Contains(terminatorIds, e.terminator.Id))
	ctx.True(stringz.Contains(terminatorIds, e.terminator2.Id))

	terminatorIds = ctx.GetRelatedIds(e.router, EntityTypeTerminators)
	ctx.EqualValues(1, len(terminatorIds))
	ctx.EqualValues(e.terminator.Id, terminatorIds[0])

	terminatorIds = ctx.GetRelatedIds(e.router2, EntityTypeTerminators)
	ctx.EqualValues(2, len(terminatorIds))
	ctx.True(stringz.Contains(terminatorIds, e.terminator2.Id))
	ctx.True(stringz.Contains(terminatorIds, e.terminator3.Id))

	terminatorIds = ctx.GetRelatedIds(e.service2, EntityTypeTerminators)
	ctx.EqualValues(1, len(terminatorIds))
	ctx.EqualValues(e.terminator3.Id, terminatorIds[0])

}

func (ctx *TestContext) testLoadQueryTerminators(t *testing.T) {
	ctx.NextTest(t)
	defer ctx.cleanupAll()

	e := ctx.createTestTerminators()

	err := ctx.GetDb().View(func(tx *bbolt.Tx) error {
		loadedTerminator, err := ctx.stores.Terminator.LoadOneById(tx, e.terminator.Id)
		ctx.NoError(err)
		ctx.NotNil(loadedTerminator)
		ctx.EqualValues(e.terminator.Id, loadedTerminator.Id)
		ctx.EqualValues(e.terminator.Service, loadedTerminator.Service)
		ctx.EqualValues(e.terminator.Router, loadedTerminator.Router)
		ctx.EqualValues(e.terminator.Binding, loadedTerminator.Binding)
		ctx.EqualValues(e.terminator.Address, loadedTerminator.Address)
		ctx.EqualValues(e.terminator.Cost, loadedTerminator.Cost)

		ids, _, err := ctx.stores.Terminator.QueryIdsf(tx, `service = "%v"`, e.service.Id)
		ctx.NoError(err)
		ctx.EqualValues(2, len(ids))
		ctx.True(stringz.Contains(ids, e.terminator.Id))
		ctx.True(stringz.Contains(ids, e.terminator2.Id))

		ids, _, err = ctx.stores.Terminator.QueryIdsf(tx, `router = "%v"`, e.router2.Id)
		ctx.NoError(err)
		ctx.EqualValues(2, len(ids))
		ctx.True(stringz.Contains(ids, e.terminator2.Id))
		ctx.True(stringz.Contains(ids, e.terminator3.Id))

		ids, _, err = ctx.stores.Service.QueryIdsf(tx, `anyOf(terminators) = "%v"`, e.terminator.Id)
		ctx.NoError(err)
		ctx.EqualValues(1, len(ids))
		ctx.True(stringz.Contains(ids, e.service.Id))

		ids, _, err = ctx.stores.Router.QueryIdsf(tx, `anyOf(terminators) = "%v"`, e.terminator.Id)
		ctx.NoError(err)
		ctx.EqualValues(1, len(ids))
		ctx.True(stringz.Contains(ids, e.router.Id))

		return nil
	})
	ctx.NoError(err)
}

func (ctx *TestContext) testUpdateTerminators(t *testing.T) {
	ctx.NextTest(t)
	defer ctx.cleanupAll()

	e := ctx.createTestTerminators()

	terminator := e.terminator
	ctx.RequireReload(terminator)

	time.Sleep(time.Millisecond * 10) // ensure updatedAt is after createdAt

	terminator.Service = e.service2.Id
	terminator.Router = e.router2.Id
	terminator.Binding = uuid.New().String()
	terminator.Address = uuid.New().String()
	terminator.Tags = ctx.CreateTags()
	ctx.RequireUpdate(terminator)

	terminator.Service = e.service.Id // service should not be updated
	ctx.ValidateUpdated(terminator)

}

func (ctx *TestContext) testDeleteTerminators(t *testing.T) {
	ctx.NextTest(t)
	defer ctx.cleanupAll()

	e := ctx.createTestTerminators()

	ctx.RequireDelete(e.terminator3)
	ctx.RequireDelete(e.router2)

	ctx.ValidateDeleted(e.terminator2.Id)
	ctx.ValidateDeleted(e.terminator3.Id)

	ctx.RequireDelete(e.service)
	ctx.ValidateDeleted(e.terminator.Id)
}

func (ctx *TestContext) testPatchTerminator(t *testing.T) {
	service := ctx.requireNewService()
	router := ctx.requireNewRouter()

	terminator := &Terminator{}
	terminator.Service = service.Id
	terminator.Router = router.Id
	terminator.Binding = uuid.New().String()
	terminator.Address = uuid.New().String()
	terminator.Cost = 0
	terminator.PeerData = map[uint32][]byte{
		1: {1, 2, 3},
		2: {3, 4, 5},
	}
	ctx.RequireCreate(terminator)
	ctx.ValidateBaseline(terminator)

	terminator.Cost = 100
	checker := boltz.MapFieldChecker{
		FieldTerminatorCost: struct{}{},
	}
	ctx.RequirePatch(terminator, checker)
	ctx.ValidateUpdated(terminator)

	terminator.PeerData = map[uint32][]byte{
		1: {7, 8, 9},
	}

	checker = boltz.MapFieldChecker{
		FieldServerPeerData: struct{}{},
	}
	ctx.RequirePatch(terminator, checker)
	ctx.ValidateUpdated(terminator)
}

type testStrategyFactory struct{}

func (t testStrategyFactory) GetStrategyName() string {
	return "smartrouting"
}

func (t testStrategyFactory) NewStrategy() xt.Strategy {
	return &testStrategy{}
}

type testStrategy struct{}

func (t testStrategy) Select(terminators []xt.CostedTerminator) (xt.Terminator, error) {
	return terminators[0], nil
}

func (t testStrategy) HandleTerminatorChange(xt.StrategyChangeEvent) error {
	return nil
}

func (t testStrategy) NotifyEvent(xt.TerminatorEvent) {
}