/*
Copyright © 2026 Google LLC

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 resourcemanager

import (
	"context"
	"fmt"
	"strings"

	cloudresourcemanager "google.golang.org/api/cloudresourcemanager/v3"

	"github.com/cloud-gtm/gemini-box-office/internal/ports"
)

var _ ports.ResourceManagerClient = (*Adapter)(nil)

// Adapter implements ports.ResourceManagerClient using the Cloud Resource
// Manager API v3.
type Adapter struct {
	svc *cloudresourcemanager.Service
}

// New constructs an Adapter from an already-authenticated
// *cloudresourcemanager.Service. The caller is responsible for configuring
// Application Default Credentials before calling New.
func New(svc *cloudresourcemanager.Service) *Adapter {
	return &Adapter{svc: svc}
}

// ResolveProjectNumber returns the numeric project number for the given project
// ID by calling projects.get on the Resource Manager API. The returned string
// contains only the number (e.g. "415104041262"), with the "projects/" prefix
// stripped.
func (a *Adapter) ResolveProjectNumber(ctx context.Context, projectID string) (string, error) {
	project, err := a.svc.Projects.Get("projects/" + projectID).Context(ctx).Do()
	if err != nil {
		return "", fmt.Errorf("resolving project number for %q: %w", projectID, err)
	}
	// project.Name has the form "projects/415104041262".
	number := strings.TrimPrefix(project.Name, "projects/")
	return number, nil
}