/*
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 (
	"fmt"
	"strings"

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

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

const (
	testInstanceName   = "shared"
	testNamespace      = "default"
	testPostgreSQLHost = "postgres.example.test"
)

var _ = Describe("v1alpha1 API contract", func() {
	It("applies fixed Instance defaults through the API server", func() {
		instance := &databasev1alpha1.PostgreSQLInstance{
			ObjectMeta: metav1.ObjectMeta{Name: "defaults"},
			Spec: databasev1alpha1.PostgreSQLInstanceSpec{
				Endpoint: databasev1alpha1.PostgreSQLEndpoint{
					Host:     testPostgreSQLHost,
					HostAddr: "192.0.2.20",
				},
				AdminCredentialRef: databasev1alpha1.OpenBaoSecretReference{
					Path: "infrastructure/postgresql/admin",
				},
			},
		}

		Expect(k8sClient.Create(ctx, instance)).To(Succeed())
		DeferCleanup(func() { Expect(k8sClient.Delete(ctx, instance)).To(Succeed()) })
		Expect(instance.Spec.Endpoint.Port).To(Equal(int32(5432)))
		Expect(instance.Spec.Endpoint.Database).To(Equal("postgres"))
		Expect(instance.Spec.Endpoint.SSLMode).To(Equal(databasev1alpha1.PostgreSQLSSLModeVerifyFull))
		Expect(instance.Spec.AdminCredentialRef.UsernameKey).To(Equal("username"))
		Expect(instance.Spec.AdminCredentialRef.PasswordKey).To(Equal("password"))
	})

	It("rejects invalid PostgreSQL identifiers and host addresses", func() {
		instance := &databasev1alpha1.PostgreSQLInstance{
			ObjectMeta: metav1.ObjectMeta{Name: "invalid-endpoint"},
			Spec: databasev1alpha1.PostgreSQLInstanceSpec{
				Endpoint: databasev1alpha1.PostgreSQLEndpoint{
					Host:     testPostgreSQLHost,
					HostAddr: "not-an-ip",
					Database: "Invalid-Database",
				},
				AdminCredentialRef: databasev1alpha1.OpenBaoSecretReference{Path: "admin"},
			},
		}

		err := k8sClient.Create(ctx, instance)
		Expect(apierrors.IsInvalid(err)).To(BeTrue(), "expected invalid error, got %v", err)
	})

	It("rejects unsafe OpenBao paths", func() {
		for index, path := range []string{"data/postgresql/admin", "postgresql/../admin", "/postgresql/admin"} {
			instance := &databasev1alpha1.PostgreSQLInstance{
				ObjectMeta: metav1.ObjectMeta{Name: fmt.Sprintf("invalid-path-%d", index)},
				Spec: databasev1alpha1.PostgreSQLInstanceSpec{
					Endpoint: databasev1alpha1.PostgreSQLEndpoint{
						Host:     testPostgreSQLHost,
						HostAddr: "192.0.2.21",
					},
					AdminCredentialRef: databasev1alpha1.OpenBaoSecretReference{Path: path},
				},
			}

			err := k8sClient.Create(ctx, instance)
			Expect(apierrors.IsInvalid(err)).To(BeTrue(), "path %q: expected invalid error, got %v", path, err)
		}
	})

	It("applies fixed Tenant defaults while preserving semantic defaults", func() {
		tenant := &databasev1alpha1.PostgreSQLTenant{
			ObjectMeta: metav1.ObjectMeta{Name: "api-defaults", Namespace: testNamespace},
			Spec: databasev1alpha1.PostgreSQLTenantSpec{
				InstanceRef: testInstanceName,
			},
		}

		Expect(k8sClient.Create(ctx, tenant)).To(Succeed())
		DeferCleanup(func() { Expect(k8sClient.Delete(ctx, tenant)).To(Succeed()) })
		Expect(tenant.Spec.DeletionPolicy).To(Equal(databasev1alpha1.DeletionPolicyRetain))
		Expect(tenant.Spec.Database).To(BeEmpty())
		Expect(tenant.Spec.LoginRole).To(BeEmpty())
		Expect(tenant.Spec.Credential.SecretName).To(BeEmpty())
		Expect(tenant.EffectiveDatabase()).To(Equal("api-defaults"))
		Expect(tenant.EffectiveLoginRole()).To(Equal("api-defaults"))
		Expect(tenant.EffectiveSecretName()).To(Equal("shared-api-defaults-postgresql"))
	})

	It("accepts a custom target Secret name", func() {
		tenant := &databasev1alpha1.PostgreSQLTenant{
			ObjectMeta: metav1.ObjectMeta{Name: "custom-secret", Namespace: testNamespace},
			Spec: databasev1alpha1.PostgreSQLTenantSpec{
				InstanceRef: testInstanceName,
				Credential: databasev1alpha1.PostgreSQLCredentialSpec{
					SecretName: "database-credentials",
				},
			},
		}

		Expect(k8sClient.Create(ctx, tenant)).To(Succeed())
		DeferCleanup(func() { Expect(k8sClient.Delete(ctx, tenant)).To(Succeed()) })
		Expect(tenant.EffectiveSecretName()).To(Equal("database-credentials"))
	})

	It("rejects names that cannot produce a valid ExternalSecret name", func() {
		tenant := &databasev1alpha1.PostgreSQLTenant{
			ObjectMeta: metav1.ObjectMeta{Name: strings.Repeat("t", 121), Namespace: testNamespace},
			Spec: databasev1alpha1.PostgreSQLTenantSpec{
				InstanceRef: strings.Repeat("i", 121),
				Database:    "valid_database",
				LoginRole:   "valid_role",
			},
		}

		err := k8sClient.Create(ctx, tenant)
		Expect(apierrors.IsInvalid(err)).To(BeTrue(), "expected invalid error, got %v", err)
	})
})