name: Auto Release with Version Check

on:
  push:
    branches:
      - main

jobs:
  release:
    runs-on: ubuntu-latest

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

      - name: Extract base version from pyproject.toml
        id: version
        run: |
          base=$(grep '^version *= *"' pyproject.toml | sed -E 's/version *= *"([^"]+)"/\1/')
          echo "base_version=$base" >> $GITHUB_OUTPUT

      - name: Check if tag for this version already exists
        run: |
          TAG="v${{ steps.version.outputs.base_version }}"
          git fetch --tags
          if git rev-parse "$TAG" >/dev/null 2>&1; then
            echo "Tag $TAG already exists. Skipping release."
            exit 0
          fi

      - name: Set version tag
        id: unique_tag
        run: |
          echo "final_tag=v${{ steps.version.outputs.base_version }}" >> $GITHUB_OUTPUT

      - name: Get latest commit message
        id: last_commit
        run: |
          msg=$(git log -1 --pretty=%B)
          msg=${msg//$'\n'/\\n}
          echo "commit_msg=$msg" >> $GITHUB_OUTPUT

      - name: Create GitHub Release
        uses: softprops/action-gh-release@v1
        with:
          tag_name: ${{ steps.unique_tag.outputs.final_tag }}
          name: Release ${{ steps.unique_tag.outputs.final_tag }}
          body: |
            📦 Release based on pyproject.toml version `${{ steps.version.outputs.base_version }}`
            
            📝 Last commit message:
            ```
            ${{ steps.last_commit.outputs.commit_msg }}
            ```
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}