name: Documentation Standards Check

on:
  pull_request:
    paths:
      - 'docs/**'
      - '*.md'
      - '.github/**/*.md'

permissions:
  contents: read

jobs:
  check-doc-length:
    name: Check Document Length (500-line max)
    runs-on: ubuntu-latest

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

      - name: Check line counts
        run: |
          echo "Checking documentation files for 500-line limit..."
          echo ""

          MAX_LINES=500
          VIOLATIONS=""

          # Find all markdown files
          for file in $(find . -name "*.md" -type f | grep -v node_modules | grep -v .git); do
            lines=$(wc -l < "$file")

            if [ "$lines" -gt "$MAX_LINES" ]; then
              VIOLATIONS="$VIOLATIONS$file: $lines lines (over $MAX_LINES limit)"$'\n'
              echo "FAIL: $file has $lines lines (max $MAX_LINES)"
            else
              echo "OK:   $file has $lines lines"
            fi
          done

          echo ""

          if [ -n "$VIOLATIONS" ]; then
            echo "=========================================="
            echo "VIOLATIONS FOUND:"
            echo "$VIOLATIONS"
            echo ""
            echo "Please split documents exceeding $MAX_LINES lines."
            echo "See docs/standards/MODULAR_DOCUMENTATION.md for guidance."
            exit 1
          else
            echo "All documents are within the $MAX_LINES line limit."
          fi

  check-required-sections:
    name: Check Required Sections
    runs-on: ubuntu-latest

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

      - name: Check for required sections
        run: |
          echo "Checking for required sections in documentation..."
          echo ""

          WARNINGS=""

          # Check docs/ files for required sections
          for file in $(find docs -name "*.md" -type f 2>/dev/null || true); do
            # Skip INDEX files (different structure)
            if [[ "$file" == *"INDEX.md" ]]; then
              continue
            fi

            # Check for Overview section
            if ! grep -q "^## Overview" "$file"; then
              WARNINGS="$WARNINGS$file: Missing '## Overview' section"$'\n'
            fi

            # Check for Quick Reference section (optional but recommended)
            if ! grep -q "^## Quick Reference" "$file"; then
              echo "NOTE: $file doesn't have '## Quick Reference' section (recommended)"
            fi

            # Check for Last Updated
            if ! grep -q "Last Updated:" "$file"; then
              WARNINGS="$WARNINGS$file: Missing 'Last Updated:' footer"$'\n'
            fi
          done

          if [ -n "$WARNINGS" ]; then
            echo "=========================================="
            echo "WARNINGS:"
            echo "$WARNINGS"
            echo ""
            echo "Consider adding missing sections for consistency."
          else
            echo "All required sections present."
          fi

  check-broken-links:
    name: Check Internal Links
    runs-on: ubuntu-latest

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

      - name: Check markdown links
        run: |
          echo "Checking for broken internal links..."
          echo ""

          BROKEN_LINKS=""

          # Find all markdown links
          for file in $(find . -name "*.md" -type f | grep -v node_modules); do
            # Extract relative .md links
            links=$(grep -oE '\[.*\]\([^)]+\.md[^)]*\)' "$file" 2>/dev/null | grep -oE '\([^)]+\)' | tr -d '()' || true)

            for link in $links; do
              # Remove anchor (#...) from link
              link_path=$(echo "$link" | cut -d'#' -f1)

              # Skip external links
              if [[ "$link_path" == http* ]]; then
                continue
              fi

              # Resolve relative path
              dir=$(dirname "$file")
              full_path="$dir/$link_path"

              # Normalize path
              full_path=$(realpath -m "$full_path" 2>/dev/null || echo "$full_path")

              if [ ! -f "$full_path" ]; then
                BROKEN_LINKS="$BROKEN_LINKS$file: broken link to $link_path"$'\n'
              fi
            done
          done

          if [ -n "$BROKEN_LINKS" ]; then
            echo "=========================================="
            echo "BROKEN LINKS FOUND:"
            echo "$BROKEN_LINKS"
            exit 1
          else
            echo "All internal links are valid."
          fi

  check-trailing-whitespace:
    name: Check Formatting
    runs-on: ubuntu-latest

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

      - name: Check for trailing whitespace
        run: |
          echo "Checking for trailing whitespace..."

          FILES_WITH_TRAILING=$(find . -name "*.md" -type f | xargs grep -l " $" 2>/dev/null | grep -v node_modules || true)

          if [ -n "$FILES_WITH_TRAILING" ]; then
            echo "Files with trailing whitespace:"
            echo "$FILES_WITH_TRAILING"
            echo ""
            echo "Consider removing trailing whitespace for cleaner diffs."
          else
            echo "No trailing whitespace found."
          fi