name: 🤖 AI PR Description Generator (with Template)

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
        uses: cli/cli-action@v2

      - 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.GITHUB_TOKEN }}

      - name: Generate PR Description with OpenAI
        id: generate_description
        run: |
          RESPONSE=$(curl -s https://api.openai.com/v1/chat/completions \
            -H "Authorization: Bearer $OPENAI_API_KEY" \
            -H "Content-Type: application/json" \
            -d '{
              "model": "gpt-4o",
              "messages": [{
                "role": "user",
                "content": "Given the following commit messages:\n\n'"${commits}"'\n\nFill the following pull request template. Only fill the \"## Description\" section:\n\n<!--\n  Thanks for contributing!\n\n  Provide a description of your changes below and a general summary in the title.\n-->\n\n## Jira Ticket\n\n[SP-0000](https://syncrow.atlassian.net/browse/SP-0000)\n\n## Description\n\n<!--- Describe your changes in detail -->\n\n## How to Test\n\n<!--- Describe the created APIs / Logic -->"
              }]
            }')

          DESCRIPTION=$(echo "$RESPONSE" | jq -r '.choices[0].message.content')
          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: Update PR Body with AI Description
        run: |
          gh pr edit ${{ github.event.pull_request.number }} --body "${{ env.description }}"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}