name: Licence Check

on:
  push:
    branches: ["**", "!main", "!release/**"]
    paths:
      - "package.json"
      - "package-lock.json"
      - ".gitea/workflows/licence-check.yml"
      - "**/*.js"
      - "**/*.ts"
      - "**/*.jsx"
      - "**/*.tsx"
  pull_request:
    branches: ["**", "!main", "!release/**"]
    paths:
      - "package.json"
      - "package-lock.json"
      - ".gitea/workflows/licence-check.yml"
      - "**/*.js"
      - "**/*.ts"
      - "**/*.jsx"
      - "**/*.tsx"

jobs:
  licence-check:
    name: Licence compatibility and copyright header verification
    runs-on: ubuntu-latest
    continue-on-error: true
    steps:
      - uses: actions/checkout@v4

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: "22"

      - name: Install production dependencies
        run: npm ci --omit=dev

      - name: Check licence compatibility
        run: |
          npx --yes license-checker --production \
            --onlyAllow "MIT;ISC;MIT-0;BSD-2-Clause;BSD-3-Clause;Apache-2.0;CC0-1.0;BlueOak-1.0.0" \
            --excludePrivatePackages \
            && echo "All production dependency licences are compatible with MIT."

      - name: Check copyright headers in source files
        run: |
          #!/bin/bash
          set -e
          
          # Find all source files, excluding build artifacts and node_modules
          SOURCE_FILES=$(find . -type f \( -name "*.js" -o -name "*.ts" -o -name "*.jsx" -o -name "*.tsx" \) \
            ! -path "./node_modules/*" \
            ! -path "./.git/*" \
            ! -path "./dist/*" \
            ! -path "./build/*" \
            ! -path "./.gitea/*")
          
          MISSING_HEADER=0
          
          # Check each file for MIT-compliant copyright header
          while IFS= read -r file; do
            if [ -z "$file" ]; then
              continue
            fi
            
            # Check if file starts with a copyright header containing: Copyright, year (4 digits), name, and MIT License
            if ! head -n 5 "$file" | grep -qiE "Copyright.*[0-9]{4}.*MIT"; then
              echo "❌ Missing MIT-compliant copyright header in: $file"
              echo "   Required format: // Copyright (c) YYYY Name. MIT License."
              MISSING_HEADER=$((MISSING_HEADER + 1))
            fi
          done <<< "$SOURCE_FILES"
          
          if [ $MISSING_HEADER -gt 0 ]; then
            echo ""
            echo "⚠️  Found $MISSING_HEADER file(s) with missing or non-compliant copyright headers."
            exit 1
          else
            echo "✅ All source files have MIT-compliant copyright headers."
          fi