name: AWS Deployment

on:
  workflow_call:
    inputs:
      aws_account_id:
        required: true
        type: string
      aws_role_prefix:
        required: true
        type: string
      aws_task_prefix:
        required: true
        type: string
      concurrency_tag:
        required: false
        type: string
        default: ""
      environment:
        required: true
        type: string
      release_tag:
        required: false
        type: string

concurrency:
  group: deploy-${{ inputs.environment }}${{ inputs.concurrency_tag }}
  cancel-in-progress: true

env:
  app_repo_role: arn:aws:iam::815624722760:role/core-application-repo
  aws_region: eu-west-2
  repository: core

jobs:
  push_docker_image:
    name: Push docker image to AWS
    runs-on: ubuntu-latest
    permissions:
      id-token: write

    steps:
      - name: Checkout code
        uses: actions/checkout@v3

      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v3
        with:
          aws-region: ${{ env.aws_region }}
          role-to-assume: ${{ env.app_repo_role }}

      - name: Login to Amazon ECR
        id: ecr-login
        uses: aws-actions/amazon-ecr-login@v1
        with:
          mask-password: 'true'

      - name: Check if image with tag already exists
        run: |
          echo "image-exists=$(if aws ecr list-images --repository-name=$repository --query "imageIds[*].imageTag" | grep -q ${{ github.sha }}; then echo true; else echo false; fi)" >> $GITHUB_ENV

      - name: Build, tag, and push docker image to ECR if there is no image, failing for releases
        id: build-image
        if: ${{ env.image-exists == 'false' }}
        env:
          registry: ${{ steps.ecr-login.outputs.registry }}
          commit_tag: ${{ github.sha }}
        run: |
          if [[ ${{ inputs.environment }} == 'production' ]]; then
            echo "Error: Deployment to production environment is not allowed as there is no docker image (i.e. the AWS deploy on staging was unsuccessful for this commit)."
            exit 1
          fi
          docker build -t $registry/$repository:$commit_tag . --target=production
          docker push $registry/$repository:$commit_tag

  deploy:
    name: Deploy image
    runs-on: ubuntu-latest
    environment: ${{ inputs.environment }}
    needs: push_docker_image

    steps:
      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v3
        with:
          aws-region: ${{ env.aws_region }}
          role-to-assume: ${{ env.app_repo_role }}

      - name: Login to Amazon ECR
        id: ecr-login
        uses: aws-actions/amazon-ecr-login@v1
        with:
          mask-password: 'true'

      - name: Get timestamp
        id: timestamp
        run: echo "timestamp=$(date +%Y%m%d%H%M%S)" >> $GITHUB_ENV

      - name: Get additional tag
        run: |
          echo "additional-tag=$(if [[ ${{ inputs.environment }} == 'production' ]]; then echo ${{ inputs.release_tag }}-${{ env.timestamp }}; else echo ${{ env.timestamp }}; fi)" >> $GITHUB_ENV

      - name: Add environment tag to existing image
        id: update-image-tags
        env:
          registry: ${{ steps.ecr-login.outputs.registry }}
          commit_tag: ${{ github.sha }}
          readable_tag: ${{ inputs.environment }}-${{ env.additional-tag }}
        run: |
          manifest=$(aws ecr batch-get-image --repository-name $repository --image-ids imageTag=$commit_tag --output text --query images[].imageManifest)
          aws ecr put-image --repository-name $repository --image-tag $readable_tag --image-manifest "$manifest"
          echo "image=$registry/$repository:$readable_tag" >> $GITHUB_ENV

      - name: Configure AWS credentials for environment
        uses: aws-actions/configure-aws-credentials@v3
        with:
          aws-region: ${{ env.aws_region }}
          role-to-assume: arn:aws:iam::${{ inputs.aws_account_id }}:role/${{ inputs.aws_role_prefix }}-deployment
          role-chaining: true

      - name: Download ad hoc task definition
        env:
          ad_hoc_task_definition: ${{ inputs.aws_task_prefix }}-ad-hoc
        run: |
          aws ecs describe-task-definition --task-definition $ad_hoc_task_definition --query taskDefinition > ad-hoc-task-definition.json

      - name: Update image ID
        id: ad-hoc-task-def
        uses: aws-actions/amazon-ecs-render-task-definition@v1
        with:
          task-definition: ad-hoc-task-definition.json
          container-name: app
          image: ${{ env.image }}

      - name: Update ad hoc task definition
        uses: aws-actions/amazon-ecs-deploy-task-definition@v1
        with:
          task-definition: ${{ steps.ad-hoc-task-def.outputs.task-definition }}

      - name: Setup Database
        if: ${{ inputs.environment == 'review' }}
        env:
          ad_hoc_task_definition: ${{ inputs.aws_task_prefix }}-ad-hoc
          cluster: ${{ inputs.aws_task_prefix }}-app
          service: ${{ inputs.aws_task_prefix }}-app
        run: |
          network=$(aws ecs describe-services --cluster $cluster --services $service --query services[0].networkConfiguration)
          overrides='{ "containerOverrides" : [{ "name" : "app", "command" : ["bundle", "exec", "rake", "db:prepare"]}]}'
          arn=$(aws ecs run-task --cluster $cluster --task-definition $ad_hoc_task_definition --network-configuration "$network" --overrides "$overrides" --group migrations --launch-type FARGATE --query tasks[0].taskArn)
          echo "Waiting for db prepare task to complete"
          temp=${arn##*/}
          id=${temp%*\"}
          aws ecs wait tasks-stopped --cluster $cluster --tasks $id
          succeeded=$(aws ecs describe-tasks --cluster $cluster --tasks $id --query "tasks[0].stopCode == 'EssentialContainerExited' && to_string(tasks[0].containers[0].exitCode) == '0'")
          if [ $succeeded == true ]; then exit 0; else exit 1; fi

      - name: Run migrations task
        env:
          ad_hoc_task_definition: ${{ inputs.aws_task_prefix }}-ad-hoc
          cluster: ${{ inputs.aws_task_prefix }}-app
          service: ${{ inputs.aws_task_prefix }}-app
        run: |
          network=$(aws ecs describe-services --cluster $cluster --services $service --query services[0].networkConfiguration)
          overrides='{ "containerOverrides" : [{ "name" : "app", "command" : ["bundle", "exec", "rake", "db:migrate"]}]}'
          arn=$(aws ecs run-task --cluster $cluster --task-definition $ad_hoc_task_definition --network-configuration "$network" --overrides "$overrides" --group migrations --launch-type FARGATE --query tasks[0].taskArn)
          echo "Waiting for migration task to complete"
          temp=${arn##*/}
          id=${temp%*\"}
          aws ecs wait tasks-stopped --cluster $cluster --tasks $id
          succeeded=$(aws ecs describe-tasks --cluster $cluster --tasks $id --query "tasks[0].stopCode == 'EssentialContainerExited' && to_string(tasks[0].containers[0].exitCode) == '0'")
          if [ $succeeded == true ]; then exit 0; else exit 1; fi

      - name: Download app service task definition
        env:
          app_task_definition: ${{ inputs.aws_task_prefix }}-app
        run: |
          aws ecs describe-task-definition --task-definition $app_task_definition --query taskDefinition > app-task-definition.json

      - name: Update app image ID
        id: app-task-def
        uses: aws-actions/amazon-ecs-render-task-definition@v1
        with:
          task-definition: app-task-definition.json
          container-name: app
          image: ${{ env.image }}

      - name: Deploy updated application
        uses: aws-actions/amazon-ecs-deploy-task-definition@v1
        with:
          cluster: ${{ inputs.aws_task_prefix }}-app
          service: ${{ inputs.aws_task_prefix }}-app
          task-definition: ${{ steps.app-task-def.outputs.task-definition }}
          wait-for-service-stability: true

      - name: Download sidekiq service task definition
        env:
          sidekiq_task_definition: ${{ inputs.aws_task_prefix }}-sidekiq
        run: |
          aws ecs describe-task-definition --task-definition $sidekiq_task_definition --query taskDefinition > sidekiq-task-definition.json

      - name: Update sidekiq image ID
        id: sidekiq-task-def
        uses: aws-actions/amazon-ecs-render-task-definition@v1
        with:
          task-definition: sidekiq-task-definition.json
          container-name: sidekiq
          image: ${{ env.image }}

      - name: Deploy updated sidekiq
        uses: aws-actions/amazon-ecs-deploy-task-definition@v1
        with:
          cluster: ${{ inputs.aws_task_prefix }}-app
          service: ${{ inputs.aws_task_prefix }}-sidekiq
          task-definition: ${{ steps.sidekiq-task-def.outputs.task-definition }}
          wait-for-service-stability: true