name: 'Push Docker Tags'
description: 'Tag and push Docker images based on git context'

inputs:
  registry:
    description: 'Docker registry URL'
    required: true
  registry-username:
    description: 'Docker registry username'
    required: true
  registry-password:
    description: 'Docker registry password'
    required: true
  image-name:
    description: 'Full image name (e.g., phundrak/my-app)'
    required: true
  local-image:
    description: 'Local image to tag and push'
    required: true
  event-name:
    description: 'GitHub/Gitea event name (pass github.event_name)'
    required: true
  ref:
    description: 'Git ref (pass github.ref)'
    required: true
  ref-type:
    description: 'Git ref type (pass github.ref_type)'
    required: true
  ref-name:
    description: 'Git ref name (pass github.ref_name)'
    required: true
  pr-number:
    description: 'Pull request number (pass github.event.pull_request.number)'
    required: false
    default: ''

outputs:
  pushed-tags:
    description: 'Space-separated list of tags that were pushed'
    value: ${{ steps.push.outputs.tags }}

runs:
  using: composite
  steps:
    - name: Log in to Docker Registry
      shell: bash
      run: |
        echo "${{ inputs.registry-password }}" | docker login ${{ inputs.registry }} -u ${{ inputs.registry-username }} --password-stdin

    - name: Determine tags and push images
      id: push
      shell: bash
      run: |
        set -euo pipefail

        REGISTRY="${{ inputs.registry }}"
        IMAGE_NAME="${{ inputs.image-name }}"
        LOCAL_IMAGE="${{ inputs.local-image }}"
        PUSHED_TAGS=""

        echo "Event: ${{ inputs.event-name }}"
        echo "Ref: ${{ inputs.ref }}"
        echo "Ref type: ${{ inputs.ref-type }}"

        push_tag() {
          local tag="$1"
          echo "Tagging and pushing: ${REGISTRY}/${IMAGE_NAME}:${tag}"
          docker tag "${LOCAL_IMAGE}" "${REGISTRY}/${IMAGE_NAME}:${tag}"
          docker push "${REGISTRY}/${IMAGE_NAME}:${tag}"
          PUSHED_TAGS="${PUSHED_TAGS}${tag} "
        }

        if [[ "${{ inputs.event-name }}" == "push" && "${{ inputs.ref-type }}" == "tag" ]]; then
          TAG_VERSION="${{ inputs.ref-name }}"
          TAG_VERSION="${TAG_VERSION#v}"
          push_tag "latest"
          push_tag "${TAG_VERSION}"

        elif [[ "${{ inputs.event-name }}" == "push" && "${{ inputs.ref }}" == "refs/heads/develop" ]]; then
          push_tag "develop"

        elif [[ "${{ inputs.event-name }}" == "pull_request" ]]; then
          if [[ -z "${{ inputs.pr-number }}" ]]; then
            echo "::error::PR number is required for pull_request events"
            exit 1
          fi
          push_tag "pr${{ inputs.pr-number }}"

        elif [[ "${{ inputs.event-name }}" == "push" && "${{ inputs.ref }}" == "refs/heads/main" ]]; then
          push_tag "latest"

        else
          echo "::error::Unknown event or ref combination: event=${{ inputs.event-name }}, ref=${{ inputs.ref }}"
          exit 1
        fi

        echo "tags=${PUSHED_TAGS}" >> "$GITHUB_OUTPUT"

    - name: Log out from Docker Registry
      if: always()
      shell: bash
      run: docker logout ${{ inputs.registry }}