name: Check Release PR

on:
  pull_request:
    types:
      - opened
      - synchronize
    branches:
      - main

jobs:
  check-commits:
    runs-on: ubuntu-latest
    if: startsWith(github.head_ref, 'release/')
    steps:
    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8  # v6.0.1
      with:
        ref: ${{ github.head_ref }}
        fetch-depth: 0

    - name: Check all PR commits exist in main
      run: |
        git fetch origin main

        CHERRY_OUTPUT=$(git cherry origin/main HEAD)

        if [ -z "$CHERRY_OUTPUT" ]; then
          echo "✅ All commits already exist in main"
          exit 0
        fi

        echo "Cherry check results:"
        echo "$CHERRY_OUTPUT"

        MISSING_COMMITS=$(echo "$CHERRY_OUTPUT" | grep '^+' | cut -d' ' -f2)

        if [ -z "$MISSING_COMMITS" ]; then
          echo "✅ All commits exist in main"
          exit 0
        fi

        COMMIT_COUNT=$(echo "$MISSING_COMMITS" | wc -l)
        FIRST_COMMIT=$(git rev-list --reverse HEAD ^origin/main | head -1)

        if [ "$COMMIT_COUNT" -eq 1 ] && echo "$MISSING_COMMITS" | grep -q "$FIRST_COMMIT"; then
          echo "✅ Only version bump commit is unique"
          git log --oneline -1 "$FIRST_COMMIT"
        else
          echo "❌ Found commits that should exist in main:"
          for commit in $MISSING_COMMITS; do
            if [ "$commit" != "$FIRST_COMMIT" ]; then
              git log --oneline -1 "$commit"
            fi
          done
          echo "Make sure commits have equivalents in main. If you've since updated main, re-run this job"
          exit 1
        fi