name: Benchmarks (PR)
on: issue_comment
permissions:
  issues: write

env:
  GH_TOKEN: ${{ secrets.MEILI_BOT_GH_PAT }}

jobs:
  run-benchmarks-on-comment:
    if: startsWith(github.event.comment.body, '/benchmark')
    name: Run and upload benchmarks
    runs-on: benchmarks
    timeout-minutes: 4320 # 72h
    steps:
      - name: Check permissions
        id: permission
        env:
          PR_AUTHOR: ${{github.event.issue.user.login }}
          COMMENT_AUTHOR: ${{github.event.comment.user.login }}
          REPOSITORY: ${{github.repository}}
          PR_ID: ${{github.event.issue.number}}
        run: |
          PR_REPOSITORY=$(gh api /repos/"$REPOSITORY"/pulls/"$PR_ID" --jq .head.repo.full_name)
          if $(gh api /repos/"$REPOSITORY"/collaborators/"$PR_AUTHOR"/permission --jq .user.permissions.push)
          then
            echo "::notice title=Authentication success::PR author authenticated"
          else
            echo "::error title=Authentication error::PR author doesn't have push permission on this repository"
            exit 1
          fi
          if $(gh api /repos/"$REPOSITORY"/collaborators/"$COMMENT_AUTHOR"/permission --jq .user.permissions.push)
          then
            echo "::notice title=Authentication success::Comment author authenticated"
          else
            echo "::error title=Authentication error::Comment author doesn't have push permission on this repository"
            exit 1
          fi
          if [ "$PR_REPOSITORY" = "$REPOSITORY" ]
          then
            echo "::notice title=Authentication success::PR started from main repository"
          else
            echo "::error title=Authentication error::PR started from a fork"
            exit 1
          fi

      - uses: dtolnay/rust-toolchain@1.79
        with:
          profile: minimal

      - name: Check for Command
        id: command
        uses: xt0rted/slash-command-action@v2
        with:
          command: benchmark
          reaction-type: "eyes"
          repo-token: ${{ env.GH_TOKEN }}

      - uses: xt0rted/pull-request-comment-branch@v2
        id: comment-branch
        with:
          repo_token: ${{ env.GH_TOKEN }}

      - uses: actions/checkout@v3
        if: success()
        with:
          fetch-depth: 0 # fetch full history to be able to get main commit sha
          ref: ${{ steps.comment-branch.outputs.head_ref }}

      # Set variables
      - name: Set current branch name
        shell: bash
        run: echo "name=$(git rev-parse --abbrev-ref HEAD)" >> $GITHUB_OUTPUT
        id: current_branch
      - name: Set normalized current branch name # Replace `/` by `_` in branch name to avoid issues when pushing to S3
        shell: bash
        run: echo "name=$(git rev-parse --abbrev-ref HEAD | tr '/' '_')" >> $GITHUB_OUTPUT
        id: normalized_current_branch
      - name: Set shorter commit SHA
        shell: bash
        run: echo "short=$(echo $GITHUB_SHA | cut -c1-8)" >> $GITHUB_OUTPUT
        id: commit_sha
      - name: Set file basename with format "dataset_branch_commitSHA"
        shell: bash
        run: echo "basename=$(echo ${{ steps.command.outputs.command-arguments }}_${{ steps.normalized_current_branch.outputs.name }}_${{ steps.commit_sha.outputs.short }})" >> $GITHUB_OUTPUT
        id: file

      # Run benchmarks
      - name: Run benchmarks - Dataset ${{ steps.command.outputs.command-arguments }} - Branch ${{ steps.current_branch.outputs.name }} - Commit ${{ steps.commit_sha.outputs.short }}
        run: |
          cd crates/benchmarks
          cargo bench --bench ${{ steps.command.outputs.command-arguments }} -- --save-baseline ${{ steps.file.outputs.basename }}

      # Generate critcmp files
      - name: Install critcmp
        uses: taiki-e/install-action@v2
        with:
          tool: critcmp
      - name: Export cripcmp file
        run: |
          critcmp --export ${{ steps.file.outputs.basename }} > ${{ steps.file.outputs.basename }}.json

      # Upload benchmarks
      - name: Upload ${{ steps.file.outputs.basename }}.json to DO Spaces # DigitalOcean Spaces = S3
        uses: BetaHuhn/do-spaces-action@v2
        with:
          access_key: ${{ secrets.DO_SPACES_ACCESS_KEY }}
          secret_key: ${{ secrets.DO_SPACES_SECRET_KEY }}
          space_name: ${{ secrets.DO_SPACES_SPACE_NAME }}
          space_region: ${{ secrets.DO_SPACES_SPACE_REGION }}
          source: ${{ steps.file.outputs.basename }}.json
          out_dir: critcmp_results

      # Compute the diff of the benchmarks and send a message on the GitHub PR
      - name: Compute and send a message in the PR
        env:
          GITHUB_TOKEN: ${{ secrets.MEILI_BOT_GH_PAT }}
        run: |
          set -x
          export base_ref=$(git merge-base origin/main ${{ steps.comment-branch.outputs.head_ref }} | head -c8)
          export base_filename=$(echo ${{ steps.command.outputs.command-arguments }}_main_${base_ref}.json)
          export bench_name=$(echo ${{ steps.command.outputs.command-arguments }})
          echo "Here are your $bench_name benchmarks diff 👊" >> body.txt
          echo '```' >> body.txt
          ./benchmarks/scripts/compare.sh $base_filename ${{ steps.file.outputs.basename }}.json >> body.txt
          echo '```' >> body.txt
          gh pr comment ${{ steps.current_branch.outputs.name }} --body-file body.txt
