backend/.github/workflows/pr-description.yml

name: 🤖 AI PR Description Commenter (Safe JSON with PAT)

on:
  pull_request:
    types: [opened, edited]

jobs:
  generate-description:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout Repo
        uses: actions/checkout@v4

      - name: Install GitHub CLI and jq
        run: |
          sudo apt-get update
          sudo apt-get install gh jq -y

      - name: Fetch PR Commits
        id: fetch_commits
        run: |
          COMMITS=$(gh pr view ${{ github.event.pull_request.number }} --json commits --jq '.commits[].message' | sed 's/^/- /')
          echo "commits<<EOF" >> $GITHUB_ENV
          echo "$COMMITS" >> $GITHUB_ENV
          echo "EOF" >> $GITHUB_ENV
        env:
          GH_TOKEN: ${{ secrets.GH_PERSONAL_TOKEN }}

      - name: Generate PR Description with OpenAI (Safe JSON)
        run: |
          ESCAPED_COMMITS=$(printf '%s\n' "${commits}" | jq -R . | jq -s -c 'join("\n")')

          RESPONSE=$(curl -s https://api.openai.com/v1/chat/completions \
            -H "Authorization: Bearer $OPENAI_API_KEY" \
            -H "Content-Type: application/json" \
            -d '{
              "model": "gpt-4o",
              "messages": [{
                "role": "user",
                "content": "Given the following commit messages:\n\n'"${ESCAPED_COMMITS}"'\n\nGenerate a clear and professional pull request description."
              }]
            }')

          DESCRIPTION=$(echo "$RESPONSE" | jq -r '.choices[0].message.content')

          echo "---------- OpenAI Raw Response ----------"
          echo "$RESPONSE"
          echo "---------- Extracted Description ----------"
          echo "$DESCRIPTION"

          echo "description<<EOF" >> $GITHUB_ENV
          echo "$DESCRIPTION" >> $GITHUB_ENV
          echo "EOF" >> $GITHUB_ENV
        env:
          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
          commits: ${{ env.commits }}

      - name: Post AI Generated Description as Comment
        run: |
          gh pr comment ${{ github.event.pull_request.number }} --body "${{ env.description }}"
        env:
          GH_TOKEN: ${{ secrets.GH_PERSONAL_TOKEN }}