name: Commit Message Check

on:
  push:
    branches: [ main, develop ]
  pull_request:

jobs:
  conventional-commits:
    runs-on: [self-hosted, linux]

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 22
          cache: npm

      - name: Install dependencies
        run: npm ci --ignore-scripts

      - name: Validate commit messages with commitlint
        env:
          EVENT_NAME: ${{ github.event_name }}
          BEFORE_SHA: ${{ github.event.before }}
          PR_BASE_SHA: ${{ github.event.pull_request.base.sha }}
          PR_HEAD_SHA: ${{ github.event.pull_request.head.sha }}
          HEAD_SHA: ${{ github.sha }}
        run: |
          set -euo pipefail

          BASE_SHA=""
          TARGET_SHA="${HEAD_SHA}"
          BASE_HINT_SHA="${PR_BASE_SHA:-}"

          if [ "${EVENT_NAME}" = "pull_request" ]; then
            if [ -n "${PR_HEAD_SHA:-}" ]; then
              TARGET_SHA="${PR_HEAD_SHA}"
            elif git rev-parse "${HEAD_SHA}^2" >/dev/null 2>&1; then
              TARGET_SHA="$(git rev-parse "${HEAD_SHA}^2")"
            fi

            if [ -z "${BASE_HINT_SHA}" ] && git rev-parse "${HEAD_SHA}^1" >/dev/null 2>&1; then
              BASE_HINT_SHA="$(git rev-parse "${HEAD_SHA}^1")"
            fi
          fi

          if [ "${EVENT_NAME}" = "pull_request" ] && [ -n "${BASE_HINT_SHA}" ] && [ -n "${TARGET_SHA:-}" ]; then
            BASE_SHA="$(git merge-base "${BASE_HINT_SHA}" "${TARGET_SHA}" || true)"

            if [ -z "${BASE_SHA}" ]; then
              BASE_SHA="${BASE_HINT_SHA}"
            fi
          elif [ -n "${BEFORE_SHA:-}" ] && [ "${BEFORE_SHA}" != "0000000000000000000000000000000000000000" ]; then
            BASE_SHA="${BEFORE_SHA}"
          elif git rev-parse "${TARGET_SHA}^" >/dev/null 2>&1; then
            BASE_SHA="$(git rev-parse "${TARGET_SHA}^")"
          fi

          if [ -n "${BASE_SHA}" ] && [ "${BASE_SHA}" != "${TARGET_SHA}" ]; then
            npx --no -- commitlint --from "${BASE_SHA}" --to "${TARGET_SHA}" --verbose
          else
            git log -1 --format=%s "${TARGET_SHA}" | npx --no -- commitlint --verbose
          fi