name: 'Setup CI metadata'
description: 'Composite action to derive the registry and CI image tag for the current repository.'
inputs:
  registry:
    description: 'Container registry derived from the current GitHub server URL'
    required: false
    default: ''
  repository:
    description: 'GitHub repository in the format owner/repo'
    required: false
    default: ${{ github.repository }}
  image_tag:
    description: 'Tag for the CI image'
    required: false
    default: 'latest'
outputs:
  registry:
    description: 'Container registry derived from the current GitHub server URL'
    value: ${{ steps.setup.outputs.registry }}
  image_tag:
    description: 'Fully qualified CI image tag'
    value: ${{ steps.setup.outputs.image_tag }}
  latest_tag:
    description: 'Fully qualified latest CI image tag'
    value: ${{ steps.setup.outputs.latest_tag }}
runs:
  using: 'composite'
  steps:
    - name: Setup Dynamic Metadata
      id: setup
      shell: bash
      run: |
        # Extract the domain from server_url, handling both https:// and ssh:// schemes
        SERVER_URL="${{ github.server_url }}"

        if [[ "$SERVER_URL" =~ ^ssh:// ]]; then
          # For SSH URLs like ssh://git@host:port/path, extract just the hostname
          SERVER_DOMAIN=$(echo "$SERVER_URL" | sed -e 's|^ssh://||' -e 's|^[^@]*@||' -e 's|:[0-9]*.*||')
        else
          # For HTTPS URLs, extract domain without scheme
          SERVER_DOMAIN=$(echo "$SERVER_URL" | sed -e 's|^[^/]*//||' -e 's|/.*$||')
        fi

        echo "Extracted server domain: $SERVER_DOMAIN"

        if [[ -n "${{ inputs.registry }}" ]]; then
          REGISTRY="${{ inputs.registry }}"
        elif [[ "$SERVER_DOMAIN" == "github.com" ]]; then
          REGISTRY="ghcr.io"
        else
          REGISTRY="$SERVER_DOMAIN"
        fi

        # Extract owner/repo from github.repository, handling SSH URLs
        REPO="${{ inputs.repository }}"
        if [[ "$REPO" =~ ^ssh:// ]] || [[ "$REPO" =~ ^https:// ]]; then
          # Extract owner/repo from URLs like ssh://git@host/owner/repo.git or https://host/owner/repo.git
          REPO=$(echo "$REPO" | sed -e 's|^[^/]*/||' -e 's|\.git$||' | rev | cut -d'/' -f1,2 | rev)
        fi

        # Docker image names must be lowercase
        REGISTRY="${REGISTRY,,}"
        REPO="${REPO,,}"

        IMAGE_TAG="${REGISTRY}/${REPO}/ci:${{ inputs.image_tag }}"
        LATEST_TAG="${REGISTRY}/${REPO}/ci:latest"

        echo "registry=$REGISTRY" >> "$GITHUB_OUTPUT"
        echo "image_tag=$IMAGE_TAG" >> "$GITHUB_OUTPUT"
        echo "latest_tag=$LATEST_TAG" >> "$GITHUB_OUTPUT"