name: lint-test-docker

on:
  push:
    branches:
      - main
    paths:
      - 'hosts/**'
      - ! 'hosts/archive'

  pull_request:
    branches:
      - main
    paths:
      - 'hosts/**'
      - ! 'hosts/archive'

jobs:
  docker-lint:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check Branch Exists
        id: check-branch-exists
        uses: GuillaumeFalourd/branch-exists@v1.1
        with:
          branch: "origin/${{ github.base_ref }}"

      - name: Branch Does Not Exist
        if: steps.check-branch-exists.outputs.exists == 'false'
        run: echo "Branch origin/${{ github.base_ref }} was not found, likely already merged"


      - name: Set up Node.js
        if: steps.check-branch-exists.outputs.exists == 'true'
        uses: actions/setup-node@v4
        with:
          node-version: '22'

      - name: Lint Docker Compose
        if: steps.check-branch-exists.outputs.exists == 'true'
        run: |
          set -e  # Exit immediately if a command exits with a non-zero status.

          TARGET_BRANCH="origin/${{ github.base_ref }}"
          echo ">> Target branch for diff is: $TARGET_BRANCH"

          CHANGED_FILES=$(git diff --name-only "$TARGET_BRANCH" -- 'hosts/**')

          echo ">> Found changed files:"
          echo "$CHANGED_FILES"

          # For each changed file, find its parent chart directory (the one with compose.yaml).
          # Then, create a unique list of those directories.
          CHANGED_COMPOSE=$(echo "$CHANGED_FILES" | while read -r file; do
            dir=$(dirname "$file")
            while [[ "$dir" != "." && ! -f "$dir/compose.yaml" ]]; do
              dir=$(dirname "$dir")
            done
            if [[ "$dir" != "." ]]; then
              echo "$dir"
            fi
          done | sort -u)

          if [[ -z "$CHANGED_COMPOSE" ]]; then
            echo ">> Could not determine changed compose files. This will happen if only files outside a compose file were changed."
            exit 0
          fi

          echo ">> Running dclint on changed compose files:"
          echo "$CHANGED_COMPOSE"

          echo "$CHANGED_COMPOSE" | while read -r compose; do
            echo ">> Linting $compose ..."
            npx dclint $compose
          done