name: 'Generate Changelog'
description: 'Generate a changelog from git history between two tags, grouped by conventional commit types'

inputs:
  tag:
    description: 'The current release tag'
    required: true
    default: ${{ github.ref_name }}
  previous-tag:
    description: 'Override for previous tag (auto-detected if omitted)'
    required: false
    default: ''
  categories:
    description: 'JSON mapping of commit prefixes to section headers'
    required: false
    default: '{"feat": "✨ Features", "fix": "🐛 Bug Fixes", "refactor": "♻️ Refactoring", "chore": "🔧 Chores"}'

outputs:
  changelog:
    description: 'The generated changelog markdown'
    value: ${{ steps.changelog.outputs.changelog }}

runs:
  using: composite
  steps:
    - name: Generate changelog
      id: changelog
      shell: bash
      env:
        INPUT_TAG: ${{ inputs.tag }}
        INPUT_PREVIOUS_TAG: ${{ inputs.previous-tag }}
        INPUT_CATEGORIES: ${{ inputs.categories }}
      run: ${{ github.action_path }}/generate-changelog.sh