name: Commit Lint

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  commitlint:
    name: Validate Commit Messages
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      - name: Checkout
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Setup Node.js
        uses: actions/setup-node@v6
        with:
          node-version: "20"
          cache: "npm"

      - name: Install dependencies
        run: npm ci

      - name: Lint commit messages
        shell: bash
        run: |
          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
            FROM="${{ github.event.pull_request.base.sha }}"
            TO="${{ github.event.pull_request.head.sha }}"
          else
            FROM="${{ github.event.before }}"
            TO="${{ github.sha }}"
          fi

          if [[ "$FROM" == "0000000000000000000000000000000000000000" ]]; then
            npx commitlint --last --verbose
          else
            npx commitlint --from "$FROM" --to "$TO" --verbose
          fi