name: Release on Merge

on:
  pull_request:
    types: [closed]
    branches:
      - main

jobs:
  release:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Set Tag Name
        id: tag
        run: echo "tag=v$(date +'%Y.%m.%d-%H%M')" >> $GITHUB_OUTPUT

      - name: Generate Changelog
        id: changelog
        run: |
          echo "CHANGELOG<<EOF" >> $GITHUB_OUTPUT
          git log --pretty=format:"- %s (%h)" ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }} >> $GITHUB_OUTPUT
          echo "" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT

      - name: Create Release and Upload Asset
        uses: softprops/action-gh-release@v1
        with:
          tag_name: ${{ steps.tag.outputs.tag }}
          name: "Release: ${{ github.event.pull_request.title }}"
          body: |
            ## Summary
            ${{ github.event.pull_request.body }}

            ## Changelog
            ${{ steps.changelog.outputs.CHANGELOG }}
          files: |
            color-tool
          draft: false
          prerelease: false
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}