name: 'Retry Command'
description: 'Run a shell command, retrying up to N attempts with backoff; fails if all attempts fail'
inputs:
  command:
    description: 'Shell command(s) to run'
    required: true
  attempts:
    description: 'Maximum number of attempts (default 5)'
    required: false
    default: '5'
  delay:
    description: 'Seconds to wait between attempts (default 5)'
    required: false
    default: '5'
  workdir:
    description: 'Working directory to run in (default: workspace)'
    required: false
    default: '${{ github.workspace }}'

runs:
  using: composite
  steps:
    - shell: bash
      working-directory: ${{ inputs.workdir }}
      run: |
        set -uo pipefail
        attempts="${{ inputs.attempts }}"
        delay="${{ inputs.delay }}"

        cmd() {
          ${{ inputs.command }}
        }

        for i in $(seq 1 "$attempts"); do
          echo "::group::retry attempt $i/$attempts"
          cmd
          rc=$?
          echo "::endgroup::"
          if [ "$rc" -eq 0 ]; then
            echo "retry: command succeeded on attempt $i"
            exit 0
          fi
          if [ "$i" -lt "$attempts" ]; then
            echo "retry: attempt $i failed (rc=$rc); retrying in ${delay}s"
            sleep "$delay"
          else
            echo "::error::retry: command failed after $attempts attempts (rc=$rc)"
          fi
        done
        exit 1