# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0

# This workflow runs CI and the PR Bot on pull requests that are not from forked repositories.

name: CI
on:
  pull_request:

# Allow one instance of this workflow per pull request, and cancel older runs when new changes are pushed
concurrency:
  group: ci-yaml-${{ github.ref }}
  cancel-in-progress: true

env:
  ecr_repository: public.ecr.aws/w0m4q9l7/github-awslabs-smithy-rs-ci

jobs:
  # This job will, if possible, save a docker login password to the job outputs. The token will
  # be encrypted with the passphrase stored as a GitHub secret. The login password expires after 12h.
  # The login password is encrypted with the repo secret DOCKER_LOGIN_TOKEN_PASSPHRASE
  save-docker-login-token:
    name: Save a docker login token
    timeout-minutes: 10
    if: ${{ github.event.pull_request.head.repo.full_name == 'smithy-lang/smithy-rs' }}
    outputs:
      docker-login-password: ${{ steps.set-token.outputs.docker-login-password }}
    permissions:
      id-token: write
      contents: read
    continue-on-error: true
    runs-on: ubuntu-latest
    steps:
    - name: Attempt to load a docker login password
      uses: aws-actions/configure-aws-credentials@v4
      with:
        role-to-assume: ${{ secrets.SMITHY_RS_PUBLIC_ECR_PUSH_ROLE_ARN }}
        role-session-name: GitHubActions
        aws-region: us-west-2
    - name: Save the docker login password to the output
      id: set-token
      run: |
        ENCRYPTED_PAYLOAD=$(
          gpg --symmetric --batch --passphrase "${{ secrets.DOCKER_LOGIN_TOKEN_PASSPHRASE }}" --output - <(aws ecr-public get-login-password --region us-east-1) | base64 -w0
        )
        echo "docker-login-password=$ENCRYPTED_PAYLOAD" >> $GITHUB_OUTPUT


  # This job detects if the PR made changes to build tools. If it did, then it builds a new
  # build Docker image. Otherwise, it downloads a build image from Public ECR. In both cases,
  # it uploads the image as a build artifact for other jobs to download and use.
  acquire-base-image:
    name: Acquire Base Image
    timeout-minutes: 60
    needs: save-docker-login-token
    if: ${{ github.event.pull_request.head.repo.full_name == 'smithy-lang/smithy-rs' }}
    runs-on: smithy_ubuntu-latest_8-core
    env:
      ENCRYPTED_DOCKER_PASSWORD: ${{ needs.save-docker-login-token.outputs.docker-login-password }}
      DOCKER_LOGIN_TOKEN_PASSPHRASE: ${{ secrets.DOCKER_LOGIN_TOKEN_PASSPHRASE }}
    permissions:
      id-token: write
      contents: read
    steps:
    - uses: actions/checkout@v4
      with:
        path: smithy-rs
    - name: Acquire base image
      id: acquire
      env:
        DOCKER_BUILDKIT: 1
      run: ./smithy-rs/.github/scripts/acquire-build-image
    - name: Acquire credentials
      uses: aws-actions/configure-aws-credentials@v4
      with:
        role-to-assume: ${{ secrets.SMITHY_RS_PUBLIC_ECR_PUSH_ROLE_ARN }}
        role-session-name: GitHubActions
        aws-region: us-west-2
    - name: Upload image
      run: |
        IMAGE_TAG="$(./smithy-rs/.github/scripts/docker-image-hash)"
        docker tag "smithy-rs-base-image:${IMAGE_TAG}" "${{ env.ecr_repository }}:${IMAGE_TAG}"
        aws ecr-public get-login-password --region us-east-1 | docker login --username AWS --password-stdin public.ecr.aws
        docker push "${{ env.ecr_repository }}:${IMAGE_TAG}"

  # Run shared CI after the Docker build image has either been rebuilt or found in ECR
  ci:
    needs:
    - save-docker-login-token
    - acquire-base-image
    if: ${{ github.event.pull_request.head.repo.full_name == 'smithy-lang/smithy-rs' }}
    uses: ./.github/workflows/ci.yml
    with:
      run_sdk_examples: true
    secrets:
      ENCRYPTED_DOCKER_PASSWORD: ${{ needs.save-docker-login-token.outputs.docker-login-password }}
      DOCKER_LOGIN_TOKEN_PASSPHRASE: ${{ secrets.DOCKER_LOGIN_TOKEN_PASSPHRASE }}
      CANARY_GITHUB_ACTIONS_ROLE_ARN: ${{ secrets.CANARY_GITHUB_ACTIONS_ROLE_ARN }}
      CANARY_STACK_CDK_OUTPUTS_BUCKET_NAME: ${{ secrets.CANARY_STACK_CDK_OUTPUTS_BUCKET_NAME }}

  # The PR bot requires a Docker build image, so make it depend on the `acquire-base-image` job.
  pr_bot:
    name: PR Bot
    if: ${{ github.event.pull_request.head.repo.full_name == 'smithy-lang/smithy-rs' }}
    needs: acquire-base-image
    uses: ./.github/workflows/pull-request-bot.yml
    with:
      issue_number: ${{ github.event.number }}
      base_revision: ${{ github.event.pull_request.base.sha }}
      head_revision: ${{ github.event.pull_request.head.sha }}
    secrets:
      SMITHY_RS_PULL_REQUEST_CDN_S3_BUCKET_NAME: ${{ secrets.SMITHY_RS_PULL_REQUEST_CDN_S3_BUCKET_NAME }}
      SMITHY_RS_PULL_REQUEST_CDN_ROLE_ARN: ${{ secrets.SMITHY_RS_PULL_REQUEST_CDN_ROLE_ARN }}

  semver-checks:
    name: Check PR semver compliance
    runs-on: smithy_ubuntu-latest_8-core
    timeout-minutes: 20
    needs:
    - save-docker-login-token
    - acquire-base-image
    # We need `always` here otherwise this job won't run if the previous job has been skipped
    # See https://samanpavel.medium.com/github-actions-conditional-job-execution-e6aa363d2867
    if: |
      always() &&
      !contains(needs.*.result, 'failure') &&
      !contains(needs.*.result, 'cancelled')
    steps:
    - uses: actions/checkout@v4
      with:
        path: smithy-rs
        ref: ${{ inputs.git_ref }}
    - name: Get PR info
      id: check-breaking-label
      uses: actions/github-script@v7
      with:
        script: |
          const response = await github.rest.pulls.get({
            pull_number: context.issue.number,
            owner: context.repo.owner,
            repo: context.repo.repo,
          });
          const labels = response.data.labels.map(l => l.name);
          const isBreaking = labels.includes("breaking-change");
          const data = {
            labels,
            isBreaking
          };
          console.log("data:", data);
          return data;
    - name: Run semver check
      uses: ./smithy-rs/.github/actions/docker-build
      with:
        action: check-semver
        action-arguments: ${{ github.event.pull_request.base.sha }} ${{ fromJSON(steps.check-breaking-label.outputs.result).isBreaking }}
    - name: Print help message
      if: failure()
      run: echo "::error::This pull request either contains breaking changes, or has cross-crate changes that may be backwards compatible, but that cargo-semver-checks cannot verify. Please scrutinize the change for backwards compatibility."
