/*
Copyright 2026.

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 controller

import (
	"time"

	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

	databasev1alpha1 "git.ddupan.top/panxiao81/postgresql-tenant-operator/api/v1alpha1"
)

var _ = Describe("phase handler state machines", func() {
	DescribeTable("dispatches Instance phases",
		func(instance *databasev1alpha1.PostgreSQLInstance, expected databasev1alpha1.PostgreSQLInstancePhase, hasMessage bool) {
			result := newInstanceStateMachine().reconcile(instance)
			Expect(result.phase).To(Equal(expected))
			if hasMessage {
				Expect(result.reconcilingMessage).NotTo(BeEmpty())
			} else {
				Expect(result.reconcilingMessage).To(BeEmpty())
			}
		},
		Entry("starts validation from an empty checkpoint",
			&databasev1alpha1.PostgreSQLInstance{},
			databasev1alpha1.PostgreSQLInstancePhaseValidating,
			true,
		),
		Entry("keeps an active phase until its handler can observe dependencies",
			&databasev1alpha1.PostgreSQLInstance{Status: databasev1alpha1.PostgreSQLInstanceStatus{
				Phase: databasev1alpha1.PostgreSQLInstancePhaseInitializingRegistry,
			}},
			databasev1alpha1.PostgreSQLInstancePhaseInitializingRegistry,
			false,
		),
		Entry("routes deletion independently of the previous phase",
			deletingInstance(),
			databasev1alpha1.PostgreSQLInstancePhaseDeleting,
			true,
		),
	)

	DescribeTable("dispatches Tenant phases",
		func(tenant *databasev1alpha1.PostgreSQLTenant, expected databasev1alpha1.PostgreSQLTenantPhase, hasMessage bool) {
			result := newTenantStateMachine().reconcile(tenant)
			Expect(result.phase).To(Equal(expected))
			if hasMessage {
				Expect(result.reconcilingMessage).NotTo(BeEmpty())
			} else {
				Expect(result.reconcilingMessage).To(BeEmpty())
			}
		},
		Entry("starts pending from an empty checkpoint",
			&databasev1alpha1.PostgreSQLTenant{},
			databasev1alpha1.PostgreSQLTenantPhasePending,
			true,
		),
		Entry("keeps an active phase until its handler can observe dependencies",
			&databasev1alpha1.PostgreSQLTenant{Status: databasev1alpha1.PostgreSQLTenantStatus{
				Phase: databasev1alpha1.PostgreSQLTenantPhaseCredentialCreated,
			}},
			databasev1alpha1.PostgreSQLTenantPhaseCredentialCreated,
			false,
		),
		Entry("routes deletion independently of the previous phase",
			deletingTenant(),
			databasev1alpha1.PostgreSQLTenantPhaseDeleting,
			true,
		),
	)
})

func deletingInstance() *databasev1alpha1.PostgreSQLInstance {
	deletionTimestamp := metav1.NewTime(time.Now())
	return &databasev1alpha1.PostgreSQLInstance{
		ObjectMeta: metav1.ObjectMeta{DeletionTimestamp: &deletionTimestamp},
		Status: databasev1alpha1.PostgreSQLInstanceStatus{
			Phase: databasev1alpha1.PostgreSQLInstancePhaseReady,
		},
	}
}

func deletingTenant() *databasev1alpha1.PostgreSQLTenant {
	deletionTimestamp := metav1.NewTime(time.Now())
	return &databasev1alpha1.PostgreSQLTenant{
		ObjectMeta: metav1.ObjectMeta{DeletionTimestamp: &deletionTimestamp},
		Status: databasev1alpha1.PostgreSQLTenantStatus{
			Phase: databasev1alpha1.PostgreSQLTenantPhaseReady,
		},
	}
}