name: 🤖 AI PR Description Commenter (100% Safe with jq)

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 with jq)
        run: |
          REQUEST_BODY=$(jq -n \
            --arg model "gpt-4o" \
            --arg content "Given the following commit messages:\n\n${commits}\n\nGenerate a clear and professional pull request description." \
            '{
              model: $model,
              messages: [{ role: "user", content: $content }]
            }'
          )

          RESPONSE=$(curl -s https://api.openai.com/v1/chat/completions \
            -H "Authorization: Bearer $OPENAI_API_KEY" \
            -H "Content-Type: application/json" \
            -d "$REQUEST_BODY")

          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 }}