import * as cdk from 'aws-cdk-lib';

// Multi-environment configuration (PR2). Resolved from CDK context: `-c env=staging`,
// default `prod`. CRITICAL: the prod config MUST keep the exact construct IDs, stack
// names, and resource settings the deployed stacks already use — renaming a deployed
// CloudFormation stack triggers replace-and-delete, which would destroy the RDS instance.
// Only non-prod environments take a stack-name suffix.

export type EnvName = 'prod' | 'staging';

export interface EnvConfig {
  readonly envName: EnvName;
  readonly env: cdk.Environment;
  /** Suffix for stack names + construct IDs. '' for prod so deployed stacks are untouched. */
  readonly stackSuffix: string;
  /** S3 bucket CORS allowed origins. */
  readonly s3CorsOrigins: string[];
  /** API Gateway CORS allowed origins. */
  readonly apiCorsOrigins: string[];
  /** Cognito web-client callback / logout URLs. */
  readonly webCallbackUrls: string[];
  readonly webLogoutUrls: string[];
  /** Cognito hosted-UI domain prefix (must be globally unique). */
  readonly cognitoDomainPrefix: string;
  /** Email subscribed to the CloudWatch alarm SNS topic. */
  readonly alarmsEmail: string;
  /** Retain stateful resources (RDS, buckets) on stack deletion. */
  readonly retainData: boolean;
}

const ACCOUNT = '328440206208';
const REGION = 'us-east-1';

// Prod values reproduce the currently-deployed stacks EXACTLY (verified against
// foundation-stack.ts / compute-stack.ts) so `cdk diff` shows no prod changes.
const PROD: EnvConfig = {
  envName: 'prod',
  env: { account: ACCOUNT, region: REGION },
  stackSuffix: '',
  s3CorsOrigins: ['https://proposals.seahaven.com', 'http://localhost:5173'],
  apiCorsOrigins: [
    'https://proposals.seahaven.com',
    'https://d2yevct5e5uuz5.cloudfront.net',
    'http://localhost:5173',
  ],
  webCallbackUrls: [
    'https://proposals.seahaven.com/callback',
    'http://localhost:5173/callback',
  ],
  webLogoutUrls: ['https://proposals.seahaven.com', 'http://localhost:5173'],
  cognitoDomainPrefix: 'proposal-system-seahaven',
  alarmsEmail: 'adam@seahavenind.com',
  retainData: true,
};

// Staging: same AWS account (Adam, 2026-06-12), suffixed stacks, no permanent domain
// yet (CloudFront default URL + localhost), data not retained.
const STAGING: EnvConfig = {
  envName: 'staging',
  env: { account: ACCOUNT, region: REGION },
  stackSuffix: '-staging',
  s3CorsOrigins: ['http://localhost:5173'],
  apiCorsOrigins: ['http://localhost:5173'],
  webCallbackUrls: ['http://localhost:5173/callback'],
  webLogoutUrls: ['http://localhost:5173'],
  cognitoDomainPrefix: 'proposal-system-seahaven-staging',
  alarmsEmail: 'adam@seahavenind.com',
  retainData: false,
};

const CONFIGS: Record<EnvName, EnvConfig> = { prod: PROD, staging: STAGING };

export function resolveConfig(app: cdk.App): EnvConfig {
  const name = (app.node.tryGetContext('env') as EnvName | undefined) ?? 'prod';
  const config = CONFIGS[name];
  if (!config) {
    throw new Error(`Unknown env '${name}'. Use -c env=prod (default) or -c env=staging.`);
  }
  return config;
}