name: 'Setup Cairn CLI'
description: 'Downloads and caches the Cairn CLI tool'

inputs:
  version:
    description: 'Cairn CLI version'
    required: false
    default: 'latest'
  server_url:
    description: 'Cairn server URL (exported as CAIRN_SERVER_URL)'
    required: false

runs:
  using: 'composite'
  steps:
    - name: Setup Cairn CLI
      shell: sh
      env:
        CAIRN_VERSION: ${{ inputs.version }}
        CAIRN_SERVER_URL: ${{ inputs.server_url }}
      run: |
        set -eu

        CACHE_DIR="${RUNNER_TOOL_CACHE:-/tmp/cairn-tool-cache}"
        TOOL_DIR="${CACHE_DIR}/cairn/${CAIRN_VERSION}/x64"
        CAIRN_URL="${{ github.server_url }}/api/packages/${{ github.repository_owner }}/generic/cairn/${CAIRN_VERSION}/cairn-x86_64-linux"

        download_cairn() {
          if command -v curl >/dev/null 2>&1; then
            curl -sfL "${CAIRN_URL}" -o "${TOOL_DIR}/cairn"
            return 0
          fi

          if command -v wget >/dev/null 2>&1; then
            wget -qO "${TOOL_DIR}/cairn" "${CAIRN_URL}"
            return 0
          fi

          if command -v apt-get >/dev/null 2>&1; then
            apt-get update -qq
            apt-get install -y -qq curl >/dev/null 2>&1
            curl -sfL "${CAIRN_URL}" -o "${TOOL_DIR}/cairn"
            return 0
          fi

          echo "ERROR: no supported downloader found (curl/wget/apt-get)"
          return 1
        }

        if [ -f "${TOOL_DIR}/cairn" ] && [ -f "${TOOL_DIR}/.complete" ]; then
          echo "Cairn CLI ${CAIRN_VERSION} found in tool cache"
        else
          echo "Downloading Cairn CLI ${CAIRN_VERSION}..."
          mkdir -p "${TOOL_DIR}"
          download_cairn
          chmod +x "${TOOL_DIR}/cairn"
          touch "${TOOL_DIR}/.complete"
          echo "Cairn CLI ${CAIRN_VERSION} installed"
        fi

        echo "${TOOL_DIR}" >> "${GITHUB_PATH}"

        if [ -n "${CAIRN_SERVER_URL}" ]; then
          echo "CAIRN_SERVER_URL=${CAIRN_SERVER_URL}" >> "${GITHUB_ENV}"
        fi