import { CfnOutput, Fn, Stack, StackProps } from "aws-cdk-lib";
import * as acm from "aws-cdk-lib/aws-certificatemanager";
import * as route53 from "aws-cdk-lib/aws-route53";
import { Construct } from "constructs";

const TF_POC_DOMAIN = "frontend-tf-poc.seahaven.com";

export interface TfPocCertificateStackProps extends StackProps {
  readonly hostedZone: route53.IHostedZone;
}

/**
 * Temporary, isolated DNS zone for the production-shaped Terraform POC.
 * Parent-zone delegation is deliberately excluded from this stack.
 */
export class TfPocZoneStack extends Stack {
  public readonly hostedZone: route53.IHostedZone;
  public readonly hostedZoneId: string;
  public readonly hostedZoneName = TF_POC_DOMAIN;

  public constructor(scope: Construct, id: string, props: StackProps) {
    super(scope, id, props);

    this.hostedZone = new route53.PublicHostedZone(this, "HostedZone", {
      zoneName: TF_POC_DOMAIN,
      comment: "Temporary isolated hosted zone for frontend Terraform adoption rehearsal",
    });
    this.hostedZoneId = this.hostedZone.hostedZoneId;

    const nameServers = this.hostedZone.hostedZoneNameServers;
    if (!nameServers) {
      throw new Error("Public hosted zone must expose delegation name servers.");
    }

    new CfnOutput(this, "HostedZoneId", {
      value: this.hostedZone.hostedZoneId,
      description: "Terraform aws_route53_zone import ID",
    });
    new CfnOutput(this, "HostedZoneName", { value: TF_POC_DOMAIN });
    new CfnOutput(this, "DelegationNameServers", {
      value: Fn.join(",", nameServers),
      description:
        "Evidence only. Add these NS values to the seahaven.com parent zone in a separately approved change.",
    });
    new CfnOutput(this, "DelegationRecordName", {
      value: TF_POC_DOMAIN,
    });
    new CfnOutput(this, "DelegationRequiredAction", {
      value:
        "SEPARATE APPROVAL REQUIRED: create an NS record for frontend-tf-poc.seahaven.com in the parent seahaven.com zone",
    });
  }
}

/**
 * Certificate is isolated so re-running the zone phase cannot remove it.
 */
export class TfPocCertificateStack extends Stack {
  public readonly certificateArn: string;

  public constructor(scope: Construct, id: string, props: TfPocCertificateStackProps) {
    super(scope, id, props);

    const certificate = new acm.Certificate(this, "Certificate", {
      domainName: TF_POC_DOMAIN,
      validation: acm.CertificateValidation.fromDns(props.hostedZone),
    });
    this.certificateArn = certificate.certificateArn;

    new CfnOutput(this, "CertificateArn", {
      value: certificate.certificateArn,
      description: "Inventory-only certificate ARN for the frontend tf-poc root",
    });
  }
}