name: Improve PR Title

on:
  pull_request:
    types: [opened, edited, synchronize]

jobs:
  improve-title:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write

    steps:
      - uses: actions/checkout@v3

      - name: Get PR Content
        id: pr-content
        uses: actions/github-script@v6
        with:
          script: |
            const { data: pr } = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number
            });
            const content = `${pr.title}\n\n${pr.body}`;
            return content;

      - name: Generate Better Title
        id: generate-title
        uses: openai/openai-api@v1
        with:
          api-key: ${{ secrets.OPENAI_API_KEY }}
          model: gpt-3.5-turbo
          messages: |
            [
              {
                "role": "system",
                "content": "You are a helpful assistant that improves pull request titles. Make titles concise, descriptive, and following conventional commit message style."
              },
              {
                "role": "user",
                "content": "Based on this pull request content, generate a better title:\n\n${{ steps.pr-content.outputs.result }}"
              }
            ]

      - name: Update PR Title
        if: steps.generate-title.outputs.response != ''
        uses: actions/github-script@v6
        with:
          script: |
            const newTitle = ${{ steps.generate-title.outputs.response }}.choices[0].message.content.trim();
            await github.rest.pulls.update({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number,
              title: newTitle
            });