/*
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 registry

import (
	"context"
	"errors"
	"os"
	"testing"

	"github.com/jackc/pgx/v5/pgconn"
	"github.com/jackc/pgx/v5/pgxpool"
)

func TestRegistryLifecycle(t *testing.T) {
	dsn := os.Getenv("POSTGRES_TEST_DSN")
	if dsn == "" {
		t.Skip("POSTGRES_TEST_DSN is not set")
	}

	ctx := context.Background()
	pool, err := pgxpool.New(ctx, dsn)
	if err != nil {
		t.Fatalf("create PostgreSQL pool: %v", err)
	}
	t.Cleanup(pool.Close)
	if err := pool.Ping(ctx); err != nil {
		t.Fatalf("ping PostgreSQL: %v", err)
	}

	dropRegistrySchema(t, ctx, pool)
	t.Cleanup(func() { dropRegistrySchema(t, ctx, pool) })

	store := NewStore(pool)
	if err := store.Bootstrap(ctx); err != nil {
		t.Fatalf("Bootstrap() error = %v", err)
	}
	if err := store.Bootstrap(ctx); err != nil {
		t.Fatalf("second Bootstrap() error = %v", err)
	}

	owner := testOwnership("tenant-uid-1", "netbox", "netbox", "netbox", "postgresql-tenants/netbox/netbox")
	result, err := store.Claim(ctx, owner)
	if err != nil || result != ClaimCreated {
		t.Fatalf("first Claim() = %q, %v; want %q, nil", result, err, ClaimCreated)
	}
	result, err = store.Claim(ctx, owner)
	if err != nil || result != ClaimOwned {
		t.Fatalf("second Claim() = %q, %v; want %q, nil", result, err, ClaimOwned)
	}

	record, err := store.Get(ctx, owner.InstanceUID, owner.TenantUID)
	if err != nil {
		t.Fatalf("Get() error = %v", err)
	}
	if record.Ownership != owner || !record.Managed || record.RetainedAt != nil {
		t.Fatalf("Get() = %#v; want matching managed owner", record)
	}

	conflict := testOwnership("tenant-uid-2", "other", owner.DatabaseName, "other", "postgresql-tenants/other/other")
	if _, err := store.Claim(ctx, conflict); !errors.Is(err, ErrConflict) {
		t.Fatalf("conflicting Claim() error = %v, want ErrConflict", err)
	}

	if err := store.MarkRetained(ctx, owner); err != nil {
		t.Fatalf("MarkRetained() error = %v", err)
	}
	if err := store.MarkRetained(ctx, owner); err != nil {
		t.Fatalf("second MarkRetained() error = %v", err)
	}
	record, err = store.Get(ctx, owner.InstanceUID, owner.TenantUID)
	if err != nil || record.Managed || record.RetainedAt == nil {
		t.Fatalf("retained Get() = %#v, %v; want unmanaged tombstone", record, err)
	}
	if err := store.Delete(ctx, owner); !errors.Is(err, ErrConflict) {
		t.Fatalf("Delete(retained) error = %v, want ErrConflict", err)
	}
	if _, err := store.Claim(ctx, owner); !errors.Is(err, ErrConflict) {
		t.Fatalf("Claim(retained) error = %v, want ErrConflict", err)
	}

	deletable := testOwnership("tenant-uid-3", "gitea", "gitea", "gitea", "postgresql-tenants/gitea/gitea")
	if _, err := store.Claim(ctx, deletable); err != nil {
		t.Fatalf("Claim(deletable) error = %v", err)
	}
	if err := store.Delete(ctx, deletable); err != nil {
		t.Fatalf("Delete() error = %v", err)
	}
	if err := store.Delete(ctx, deletable); err != nil {
		t.Fatalf("second Delete() error = %v", err)
	}
	if _, err := store.Get(ctx, deletable.InstanceUID, deletable.TenantUID); !errors.Is(err, ErrNotFound) {
		t.Fatalf("Get(deleted) error = %v, want ErrNotFound", err)
	}
}

func testOwnership(tenantUID, tenantName, databaseName, roleName, credentialPath string) Ownership {
	return Ownership{
		InstanceUID:     "instance-uid-1",
		TenantUID:       tenantUID,
		TenantNamespace: tenantName,
		TenantName:      tenantName,
		DatabaseName:    databaseName,
		RoleName:        roleName,
		CredentialPath:  credentialPath,
	}
}

type schemaDropper interface {
	Exec(context.Context, string, ...any) (pgconn.CommandTag, error)
}

func dropRegistrySchema(t *testing.T, ctx context.Context, db schemaDropper) {
	t.Helper()
	if _, err := db.Exec(ctx, `DROP SCHEMA IF EXISTS postgresql_tenant_operator CASCADE`); err != nil {
		t.Fatalf("drop registry schema: %v", err)
	}
}