# note: place this as the last step of the job, so the new cache is saved by "Post ccache" right after the old one is cleared
name: "ccache-clear"
description: "Delete GitHub Actions caches matching a key prefix, oldest first"
inputs:
  key:
    description: "Cache key prefix to match and delete"
    required: true
  older:
    description: "Only delete caches created more than this long ago (e.g. 90m, 1h, 1d). By default all matching caches are deleted"
    required: false
    default: ""
  min:
    description: "Stop deleting if fewer than this many caches would remain (e.g. 1). By default there is no minimum"
    required: false
    default: "0"
  dry-run:
    description: "Only print the caches that would be deleted, without deleting them"
    required: false
    default: "false"

runs:
  using: "composite"
  steps:
    - name: Install GitHub CLI if missing
      shell: bash
      run: |
        # e.g. in container jobs, where it is not preinstalled
        if ! command -v gh >/dev/null 2>&1; then
          echo "GitHub CLI not found, installing..."
          if ! command -v curl >/dev/null 2>&1; then
            apt-get update >/dev/null 2>&1 || true
            apt-get install -y curl >/dev/null 2>&1 || true
          fi
          mkdir -p -m 755 /etc/apt/keyrings
          curl -fsSL https://cli.github.com/packages/githubcli-archive-keyring.gpg | tee /etc/apt/keyrings/githubcli-archive-keyring.gpg >/dev/null
          chmod go+r /etc/apt/keyrings/githubcli-archive-keyring.gpg
          echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/githubcli-archive-keyring.gpg] https://cli.github.com/packages stable main" > /etc/apt/sources.list.d/github-cli.list
          apt-get update >/dev/null 2>&1 || true
          apt-get install -y gh || { echo "Failed to install GitHub CLI (gh)" >&2; exit 1; }
        fi
        command -v gh >/dev/null 2>&1 || { echo "GitHub CLI (gh) is required but could not be installed" >&2; exit 1; }

    - name: Clear caches
      shell: bash
      run: |
        bash scripts/ccache-clear.sh \
          --key "${{ inputs.key }}" \
          --older "${{ inputs.older }}" \
          --min "${{ inputs.min }}" \
          ${{ inputs.dry-run == 'true' && '--dry-run' || '' }}