name: Validate PR title

on:
  pull_request:
    types: [opened, edited, reopened]
    branches:
      - main
      - 'next-*_*_*'
      - 'fix-v*'

permissions: {}

jobs:
  validate-pr-title:
    name: 'Validate PR title'
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: read
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false
      - name: Validate PR title
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const fs = require('fs');
            const path = require('path');
            const prTitle = context.payload.pull_request.title;

            const match = prTitle.match(/^([\p{Emoji}\uFE0F\u200d]+)(?:\(([a-z-]+)\)\s*)? ([^ ].+)$/u);
            if (match === null) {
              core.setFailed('❌ Invalid format');
              return;
            }

            const [, emoji, packageName, description] = match;
            if (packageName !== undefined) {
              const packagesDir = path.join(process.env.GITHUB_WORKSPACE, 'packages');
              const packages =
                fs.readdirSync(packagesDir, { withFileTypes: true })
                .filter(dirent => dirent.isDirectory())
                .map(dirent => dirent.name)
                .filter(name => name !== 'fast-check');
              if (!packages.includes(packageName)) {
                core.setFailed('❌ Invalid package name');
                return;
              }
            }

            if (!description.trim()) {
              core.setFailed('❌ Missing description');
              return;
            }

            console.log('✅ Valid PR title');