# SPDX-FileCopyrightText: 2025 Contributors to the CitrineOS Project
#
# SPDX-License-Identifier: Apache-2.0

name: REUSE License Check

on:
  pull_request:

jobs:
  reuse-check:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v4
        with:
          python-version: '3.x'

      - name: Install REUSE tool
        run: pip install reuse

      - name: Run REUSE lint with filtering
        run: |
          # Run reuse lint and capture output
          if ! reuse lint > reuse_output.txt 2>&1; then
            echo "REUSE lint found issues. Checking against ignore list..."
            
            # Check if .reuse/ignore-files.txt exists
            if [ -f ".reuse/ignore-files.txt" ]; then
              echo "Found .reuse/ignore-files.txt file. Filtering results..."
              # Extract failing files from the REUSE output
              sed '/SUMMARY/q' reuse_output.txt | grep "^\* " | sed 's/^\* //' > failing_files.txt
              
              # Function to check if a file should be ignored
              should_ignore_file() {
                local file="$1"
                local ignore_file="$2"
                
                # Skip the reuse output file itself
                if [[ "$file" == "reuse_output.txt" ]]; then
                  return 0  # ignore (return true)
                fi
                
                while IFS= read -r ignore_pattern; do
                  # Skip empty lines and comments
                  [[ -z "$ignore_pattern" || "$ignore_pattern" =~ ^[[:space:]]*# ]] && continue
                  
                  # Remove trailing whitespace
                  ignore_pattern=$(echo "$ignore_pattern" | sed 's/[[:space:]]*$//')
                  
                  # Check for exact match first
                  if [[ "$file" == "$ignore_pattern" ]]; then
                    return 0  # ignore
                  fi
                  
                  # Check if it's a directory pattern (ends with /)
                  if [[ "$ignore_pattern" == */ ]]; then
                    # Check if file is in this directory
                    if [[ "$file" == "$ignore_pattern"* ]]; then
                      return 0  # ignore
                    fi
                  else
                    # Use shell pattern matching for globs
                    # Enable extended globbing for more complex patterns
                    shopt -s extglob nullglob
                    if [[ "$file" == $ignore_pattern ]]; then
                      return 0  # ignore
                    fi
                    shopt -u extglob nullglob
                  fi
                done < "$ignore_file"
                
                return 1  # don't ignore
              }
              
              # Find files that are failing but NOT in the ignore list
              > unignored_failures.txt
              while IFS= read -r failing_file; do
                if ! should_ignore_file "$failing_file" ".reuse/ignore-files.txt"; then
                  echo "$failing_file" >> unignored_failures.txt
                fi
              done < failing_files.txt
              
              # Check if there are any unignored failures
              if [ -s unignored_failures.txt ]; then
                echo "❌ REUSE compliance failed for the following files:"
                cat unignored_failures.txt
                echo ""
                echo "These files need proper license headers or should be added to .reuse/ignore-files.txt"
                echo ""
                exit 1
              else
                echo "✅ All REUSE lint failures are accounted for in .reuse/ignore-files.txt"
                ignored_count=$(wc -l < failing_files.txt)
                echo "Ignored $ignored_count file(s) as specified in .reuse/ignore-files.txt"
              fi
            else
              echo "❌ REUSE lint failed and no .reuse/ignore-files.txt file found"
              echo ""
              echo "Full REUSE lint output:"
              cat reuse_output.txt
              exit 1
            fi
          else
            echo "✅ REUSE lint passed - all files have proper license compliance"
          fi

      - name: Clean up temporary files
        if: always()
        run: |
          rm -f reuse_output.txt failing_files.txt unignored_failures.txt