name: josh-sync
description: Bidirectional monorepo ↔ subrepo sync via josh-proxy

inputs:
  config:
    description: "Path to .josh-sync.yml"
    default: ".josh-sync.yml"
  direction:
    description: "forward, reverse, or both"
    default: "both"
  target:
    description: "Sync only this target (default: all)"
    required: false
  branch:
    description: "Sync only this branch (default: all)"
    required: false
  debug:
    description: "Enable debug output"
    default: "false"

runs:
  using: composite
  steps:
    - name: Setup josh-sync
      shell: bash
      run: |
        JOSH_DIR="$(mktemp -d)"
        cp -r "${{ github.action_path }}/bin" "${{ github.action_path }}/lib" "${JOSH_DIR}/"
        chmod +x "${JOSH_DIR}/bin/josh-sync"
        echo "${JOSH_DIR}/bin" >> "$GITHUB_PATH"
        echo "JOSH_SYNC_ROOT=${JOSH_DIR}" >> "$GITHUB_ENV"

    - name: Check dependencies
      shell: bash
      run: |
        for cmd in git curl jq yq; do
          command -v "$cmd" &>/dev/null || { echo "::error::Missing required tool: $cmd"; exit 1; }
        done

    - name: Loop guard (forward)
      id: guard
      if: inputs.direction == 'forward' || inputs.direction == 'both'
      shell: bash
      run: |
        TRAILER=$(yq '.bot.trailer' "${{ inputs.config }}" 2>/dev/null || echo "Josh-Sync-Origin")
        if git log -1 --format=%B | grep -q "^${TRAILER}:"; then
          echo "skip=true" >> "$GITHUB_OUTPUT"
          echo "::notice::Skipping sync — HEAD commit has sync trailer (loop prevention)"
        else
          echo "skip=false" >> "$GITHUB_OUTPUT"
        fi

    - name: Sync
      if: steps.guard.outputs.skip != 'true'
      shell: bash
      env:
        JOSH_SYNC_DEBUG: ${{ inputs.debug == 'true' && '1' || '0' }}
      run: |
        ARGS="--config ${{ inputs.config }}"
        [[ "${{ inputs.direction }}" == "forward" ]] && ARGS+=" --forward"
        [[ "${{ inputs.direction }}" == "reverse" ]] && ARGS+=" --reverse"
        [[ -n "${{ inputs.target }}" ]] && ARGS+=" --target ${{ inputs.target }}"
        [[ -n "${{ inputs.branch }}" ]] && ARGS+=" --branch ${{ inputs.branch }}"
        josh-sync sync $ARGS