import * as cdk from '@aws-cdk/core';
import * as dynamodb from '@aws-cdk/aws-dynamodb';
import * as s3 from '@aws-cdk/aws-s3';
import * as s3Deploy from '@aws-cdk/aws-s3-deployment';
import * as cloudfront from '@aws-cdk/aws-cloudfront';
import * as route53  from '@aws-cdk/aws-route53';
import * as acm from '@aws-cdk/aws-certificatemanager';
import * as targets from '@aws-cdk/aws-route53-targets/lib';
import { OriginAccessIdentity } from '@aws-cdk/aws-cloudfront';
import * as ecr from '@aws-cdk/aws-ecr';
import * as ecsPatterns from '@aws-cdk/aws-ecs-patterns'
import * as ecs from '@aws-cdk/aws-ecs'
import * as ec2 from '@aws-cdk/aws-ec2'
import * as elb2 from '@aws-cdk/aws-elasticloadbalancingv2'
import { StaticSite, StaticSiteProps } from './static-website/static-webiste';

export class CdkStack extends cdk.Stack {
  constructor(scope: cdk.App, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    // 0. we need a NoSQL db to persist data

    // create dynamoDb table to store data
    const table = new dynamodb.Table(this, 'Questions', {
      partitionKey: { name: 'pk', type: dynamodb.AttributeType.STRING },
      sortKey: {name: 'sk', type: dynamodb.AttributeType.STRING},
      billingMode: dynamodb.BillingMode.PAY_PER_REQUEST,
      tableName: 'Questions'
    });

    new cdk.CfnOutput(this, 'Dynamo', { value: table.tableName });   

    // 1. we need an angular app to fun the FE and connect to an app api
    //  - S3 Bucket, Cloudfront Dist, Route 53 Alias

    // create S3 + CloudFront to host the FE
    const siteSubDomain = "app";
    const domainName = "yourdomain.com";
    const zone = route53.HostedZone.fromLookup(this, 'Zone', { domainName: domainName });
    const siteDomain = siteSubDomain + '.' + domainName;
    new cdk.CfnOutput(this, 'Site', { value: 'https://' + siteDomain });

    // TLS certificate
    const wildCartCert = new acm.DnsValidatedCertificate(this, 'SiteCertificate', {
      domainName: "*.yourdomain.com",
      hostedZone: zone,
      region: 'us-east-1', // Cloudfront only checks this region for certificates.
    });    
    const certificateArn = wildCartCert.certificateArn;
    new cdk.CfnOutput(this, 'Certificate', { value: certificateArn });

    // S3
    const bucket = new s3.Bucket(this, "MathDynastyAppBucket", {
      publicReadAccess: false,
      removalPolicy: cdk.RemovalPolicy.DESTROY,
      websiteIndexDocument: "index.html",
      bucketName: "math-dynasty-app-bucket"
    });

    new cdk.CfnOutput(this, 'Bucket', { value: bucket.bucketName });   

    const oia = new OriginAccessIdentity(this, 'OIA', {
      comment: "Created by CDK"
    });
    bucket.grantRead(oia);    

    // Cloudfront
    const distribution = new cloudfront.CloudFrontWebDistribution(this, "CDKMDAAPPDistribution", {
      aliasConfiguration: {
        acmCertRef: certificateArn,
        names: [ siteDomain ],
        sslMethod: cloudfront.SSLMethod.SNI,
        securityPolicy: cloudfront.SecurityPolicyProtocol.TLS_V1_1_2016
    },      
      originConfigs: [
        {
          s3OriginSource: {
            s3BucketSource: bucket,
            originAccessIdentity: oia
          },
          behaviors: [{isDefaultBehavior: true}]
        },
      ]
    });    
    new cdk.CfnOutput(this, 'DistributionId', { value: distribution.distributionId });    

    // Route53 alias record for the CloudFront distribution
    new route53.ARecord(this, 'SiteAliasRecord', {
        recordName: siteDomain,
        target: route53.RecordTarget.fromAlias(new targets.CloudFrontTarget(distribution)),
        zone
    });    

    // Deployment - deploy angular app
    const src = new s3Deploy.BucketDeployment(this, "DeployMDAWithInvalidation", {
      sources: [s3Deploy.Source.asset("./build")],
      destinationBucket: bucket,
      distribution,
      distributionPaths: ['/*'],      
    });     

    // 2. we need several ECS Repo
    //    angular FE, express BE, cdk

    // ECR
    const appDev = new ecr.Repository(this, 'md-app-dev', {
      imageScanOnPush: true,
      repositoryName: 'md-app-dev'
    });    
    new cdk.CfnOutput(this, 'App Repo', { value: appDev.repositoryUri });    

    const appApi = new ecr.Repository(this, 'md-app-api-dev', {
      imageScanOnPush: true,
      repositoryName: 'md-app-api-dev'
    });     
    new cdk.CfnOutput(this, 'App-API Repo', { value: appApi.repositoryUri });    

    const appCdk = new ecr.Repository(this, 'md-app-cdk', {
      imageScanOnPush: true,
      repositoryName: 'md-app-cdk'
    });         
    new cdk.CfnOutput(this, 'App-CDK Repo', { value: appCdk.repositoryUri });    

    const prodVpc = new ec2.Vpc(this, 'VPC');

    // TODO create a prod security group
    const prodCluster = new ecs.Cluster(this, 'Cluster', {
      vpc: prodVpc,
      clusterName: 'prod',      
    });     

    const prodLoadBalancedFargateService = new ecsPatterns.ApplicationLoadBalancedFargateService(this, 'ProdService', {
      cluster: prodCluster,
      certificate: wildCartCert,
      desiredCount: 1,
      assignPublicIp: true,
      protocol: elb2.ApplicationProtocol.HTTPS,
      redirectHTTP: true,
      memoryLimitMiB: 1024,
      cpu: 512,
      taskImageOptions: {
        image: ecs.ContainerImage.fromRegistry("amazon/amazon-ecs-sample"),
        containerName: 'app-api',
        containerPort: 80,
        enableLogging: true,
        family: 'prod-app-api',
        logDriver: ecs.LogDriver.awsLogs({
          streamPrefix: "prod-app-api",
        })
      },
      domainName: 'app-api.mathdynasty.com',
      domainZone: zone,
      serviceName: 'app-api'
    });    

    prodLoadBalancedFargateService.targetGroup.configureHealthCheck({
      path: "/custom-health-path",
    });     
  }
}