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// Program main demonstrates how to submit or schedule a Image Builder pipeline using Go SDKs.
package main

import (
    "context"
    "flag"
    "fmt"
    "os"

    "google.golang.org/api/cloudbuild/v1"
    "google.golang.org/api/cloudscheduler/v1"
)

var (
    projectID        = flag.String("project_id", "", "The target Project ID")
    region           = flag.String("region", "us-central1", "Region of resources")
    gcsWorkdir       = flag.String("gcs_workdir", "", "The storage workspace directory URI, e.g. gs://my-bucket/workdir/")
    serviceAccount   = flag.String("service_account", "", "Service account email to run the worker VM")
    imageBuilderYAML = flag.String("config_path", "imagebuilder.yaml", "Path to the imagebuilder.yaml configuration file")
    arRepositoryID   = flag.String("ar_repo_id", "os-images", "Name of the target generic Artifact Registry repository")
    arPackageName    = flag.String("ar_package_name", "custom-os", "Package identifier for OS images")
    cronSchedule     = flag.String("cron_schedule", "", "Optional cron schedule to run this build periodically (e.g. '0 6 * * 1')")
)

func main() {
    flag.Parse()

    if *projectID == "" || *serviceAccount == "" || *gcsWorkdir == "" {
        fmt.Fprintln(os.Stderr, "Error: --project_id, --gcs_workdir, and --service_account are required flags")
        flag.Usage()
        os.Exit(1)
    }

    ctx := context.Background()

    if *cronSchedule != "" {
        fmt.Printf("Scheduling build with cron schedule: %s\n", *cronSchedule)
        if err := scheduleBuild(ctx); err != nil {
            fmt.Fprintf(os.Stderr, "Failed to schedule Cloud Build: %v\n", err)
            os.Exit(1)
        }
    } else {
        fmt.Println("Submitting build request immediately to Cloud Build API...")
        if err := triggerBuild(ctx); err != nil {
            fmt.Fprintf(os.Stderr, "Failed to trigger Cloud Build: %v\n", err)
            os.Exit(1)
        }
    }
}

func createBuildRequest() *cloudbuild.Build {
    subs := map[string]string{
        "_GCS_WORKDIR":                    *gcsWorkdir,
        "_SERVICE_ACCOUNT":                fmt.Sprintf("projects/%s/serviceAccounts/%s", *projectID, *serviceAccount),
        "_IMAGE_OUTPUT_PATH":              "image-builder/binaryOut",
        "_IMAGE_BUILDER_CONFIG_PATH":      *imageBuilderYAML,
        "_ARTIFACT_REGISTRY_RESOURCE_URI": fmt.Sprintf("projects/%s/locations/%s/repositories/%s/packages/%s/versions/v${BUILD_ID}", *projectID, *region, *arRepositoryID, *arPackageName),
    }

    return &cloudbuild.Build{
        Steps: []*cloudbuild.BuildStep{
            {
                Name:   "us-central1-docker.pkg.dev/image-builder-official/release/builder:stable",
                Script: "#!/usr/bin/env bash\n/build",
                Id:     "imagebuilder-customize",
            },
            {
                Name:   "us-central1-docker.pkg.dev/image-builder-official/release/validator:stable",
                Script: "#!/usr/bin/env bash\n/validate",
                Id:     "imagebuilder-validate",
            },
            {
                Name:   "us-central1-docker.pkg.dev/image-builder-official/release/builder:stable",
                Script: "#!/usr/bin/env bash\n/publish",
                Id:     "imagebuilder-publish",
            },
        },
        Substitutions: subs,
        Options: &cloudbuild.BuildOptions{
            AutomapSubstitutions:  true,
            RequestedVerifyOption: "VERIFIED",
            SubstitutionOption:    "ALLOW_LOOSE",
            DynamicSubstitutions:  true,
        },
        Timeout: "3600s",
    }
}

func triggerBuild(ctx context.Context) error {
    cbService, err := cloudbuild.NewService(ctx)
    if err != nil {
        return err
    }
    build := createBuildRequest()
    op, err := cbService.Projects.Locations.Builds.Create(fmt.Sprintf("projects/%s/locations/%s", *projectID, *region), build).Do()
    if err != nil {
        return err
    }
    fmt.Printf("Build submitted: %s\n", op.Name)
    return nil
}

func scheduleBuild(ctx context.Context) error {
    cbService, err := cloudbuild.NewService(ctx)
    if err != nil {
        return err
    }
    csService, err := cloudscheduler.NewService(ctx)
    if err != nil {
        return err
    }

    // 1. Create a manual Cloud Build trigger
    trigger := &cloudbuild.BuildTrigger{
        Build:       createBuildRequest(),
        Name:        "scheduled-image-builder-trigger",
        Description: "Manual trigger invoked periodically via Cloud Scheduler for Image Builder",
    }
    createdTrigger, err := cbService.Projects.Locations.Triggers.Create(fmt.Sprintf("projects/%s/locations/%s", *projectID, *region), trigger).Do()
    if err != nil {
        return fmt.Errorf("failed creating trigger: %w", err)
    }
    fmt.Printf("Created Cloud Build trigger with ID: %s\n", createdTrigger.Id)

    // 2. Create the Cloud Scheduler job
    targetURI := fmt.Sprintf("https://cloudbuild.googleapis.com/v1/projects/%s/locations/%s/triggers/%s:run", *projectID, *region, createdTrigger.Id)
    job := &cloudscheduler.Job{
        Name:        fmt.Sprintf("projects/%s/locations/%s/jobs/weekly-image-builder-job", *projectID, *region),
        Schedule:    *cronSchedule,
        Description: "Scheduled job to run custom OS Image Builder pipeline",
        HttpTarget: &cloudscheduler.HttpTarget{
            Uri:        targetURI,
            HttpMethod: "POST",
            OauthToken: &cloudscheduler.OAuthToken{
                ServiceAccountEmail: *serviceAccount,
            },
        },
    }

    createdJob, err := csService.Projects.Locations.Jobs.Create(fmt.Sprintf("projects/%s/locations/%s", *projectID, *region), job).Do()
    if err != nil {
        return fmt.Errorf("failed creating scheduler job: %w", err)
    }
    fmt.Printf("Successfully scheduled job: %s\n", createdJob.Name)
    return nil
}

go run main.go \
  --project_id PROJECT_ID \
  --region us-central1 \
  --gcs_workdir gs://STAGING_BUCKET/workdir/ \
  --service_account SERVICE_ACCOUNT_EMAIL \
  --config_path gs://STAGING_BUCKET/imagebuilder.yaml \
  --cron_schedule '0 6 * * 1'