name: ABI Compatibility
on:
  pull_request_target:

permissions: {}

jobs:
  abi-head:
    name: ABI - HEAD
    runs-on: ubuntu-latest
    permissions: read-all
    steps:
      - name: Checkout repository
        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}

      - name: Build
        run: |
          dotnet build Jellyfin.Server -o ./out

      - name: Upload Head
        uses: actions/upload-artifact@50769540e7f4bd5e21e526ee35c689e35e0d6874 # v4.4.0
        with:
          name: abi-head
          retention-days: 14
          if-no-files-found: error
          path: out/

  abi-base:
    name: ABI - BASE
    if: ${{ github.base_ref != '' }}
    runs-on: ubuntu-latest
    permissions: read-all
    steps:
      - name: Checkout repository
        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
        with:
          ref: ${{ github.event.pull_request.head.sha }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}
          fetch-depth: 0

      - name: Checkout common ancestor
        env:
          HEAD_REF: ${{ github.head_ref }}
        run: |
          git remote add upstream https://github.com/${{ github.event.pull_request.base.repo.full_name }}
          git -c protocol.version=2 fetch --prune --progress --no-recurse-submodules upstream +refs/heads/*:refs/remotes/upstream/* +refs/tags/*:refs/tags/*
          ANCESTOR_REF=$(git merge-base upstream/${{ github.base_ref }} origin/$HEAD_REF)
          git checkout --progress --force $ANCESTOR_REF

      - name: Build
        run: |
          dotnet build Jellyfin.Server -o ./out

      - name: Upload Head
        uses: actions/upload-artifact@50769540e7f4bd5e21e526ee35c689e35e0d6874 # v4.4.0
        with:
          name: abi-base
          retention-days: 14
          if-no-files-found: error
          path: out/

  abi-diff:
    permissions:
      pull-requests: write  #  to create or update comment (peter-evans/create-or-update-comment)

    name: ABI - Difference
    if: ${{ github.event_name == 'pull_request_target' }}
    runs-on: ubuntu-latest
    needs:
      - abi-head
      - abi-base

    steps:
      - name: Download abi-head
        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
        with:
          name: abi-head
          path: abi-head

      - name: Download abi-base
        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4.1.8
        with:
          name: abi-base
          path: abi-base

      - name: Setup ApiCompat
        run: |
          dotnet tool install --global Microsoft.DotNet.ApiCompat.Tool

      - name: Run ApiCompat
        id: diff
        run: |
          {
            echo 'body<<EOF'
            for file in Jellyfin.Data.dll MediaBrowser.Common.dll MediaBrowser.Controller.dll MediaBrowser.Model.dll Emby.Naming.dll Jellyfin.Extensions.dll; do
              COMPAT_OUTPUT="$( { apicompat --left ./abi-base/${file} --right ./abi-head/${file}; } 2>&1 )"
              if [ "APICompat ran successfully without finding any breaking changes." != "${COMPAT_OUTPUT}" ]; then
                printf "\n${file}\n${COMPAT_OUTPUT}\n"
              fi
            done
            echo EOF
          } >> $GITHUB_OUTPUT

      - name: Find difference comment
        uses: peter-evans/find-comment@3eae4d37986fb5a8592848f6a574fdf654e61f9e # v3.1.0
        id: find-comment
        with:
          issue-number: ${{ github.event.pull_request.number }}
          direction: last
          body-includes: abi-diff-workflow-comment

      - name: Reply or edit difference comment (changed)
        uses: peter-evans/create-or-update-comment@71345be0265236311c031f5c7866368bd1eff043 # v4.0.0
        if: ${{ steps.diff.outputs.body != '' }}
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-id: ${{ steps.find-comment.outputs.comment-id }}
          edit-mode: replace
          token: ${{ secrets.JF_BOT_TOKEN }}
          body: |
            <!--abi-diff-workflow-comment-->
            <details>
            <summary>ABI Difference</summary>

            ```
            ${{ steps.diff.outputs.body }}
            ```

            </details>

      - name: Reply or edit difference comment (unchanged)
        uses: peter-evans/create-or-update-comment@71345be0265236311c031f5c7866368bd1eff043 # v4.0.0
        if: ${{ steps.diff.outputs.body == '' && steps.find-comment.outputs.comment-id != '' }}
        with:
          issue-number: ${{ github.event.pull_request.number }}
          comment-id: ${{ steps.find-comment.outputs.comment-id }}
          edit-mode: replace
          token: ${{ secrets.JF_BOT_TOKEN }}
          body: |
            <!--abi-diff-workflow-comment-->
            <details>
            <summary>ABI Difference</summary>

            No changes to the ABI found. See history of this comment for previous changes.

            </details>