#!/bin/bash
# ci-pre-push.sh - Validate markdown files before push
set -euo pipefail

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m'

echo -e "${YELLOW}Running pre-push checks...${NC}"

# Check if any markdown files changed
if [[ $(git diff --cached --name-only --diff-filter=ACM | grep -E '\.(md|markdown)$' | wc -l) -eq 0 ]]; then
  echo "No markdown files staged for commit."
  exit 0
fi

ERRORS=0

# Validate each staged markdown file
while IFS= read -r file; do
  echo "Checking $file..."
  if [[ -f "$file" ]]; then
    # Check front-matter existence (--- at start)
    if ! head -n 1 "$file" | grep -q '^---$'; then
      echo -e "${RED}ERROR: $file is missing front-matter (should start with ---)${NC}"
      ((ERRORS++))
    else
      # Extract front-matter block (lines between first and second ---)
      front_matter=$(sed -n '2,/^---$/p' "$file" | head -n -1)
      # Check for required fields
      if ! echo "$front_matter" | grep -q '^title:'; then
        echo -e "${RED}ERROR: $file missing title in front-matter${NC}"
        ((ERRORS++))
      fi
      if ! echo "$front_matter" | grep -q '^date:'; then
        echo -e "${RED}ERROR: $file missing date in front-matter${NC}"
        ((ERRORS++))
      fi
      # Optional: check date format
      date_line=$(echo "$front_matter" | grep '^date:' | sed 's/date: //')
      if [[ -n "$date_line" && ! "$date_line" =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}$ ]]; then
        echo -e "${YELLOW}WARNING: $file date format not YYYY-MM-DD: $date_line${NC}"
      fi
    fi

    # Spell check if aspell is available
    if command -v aspell >/dev/null 2>&1; then
      # Strip front-matter and code blocks, then spell check
      content=$(sed '/^---$/,/^---$/d' "$file" | sed '/```.*/,/```/d')
      if echo "$content" | aspell list | grep -v '^$' | head -n 5 | grep -q .; then
        echo -e "${YELLOW}WARNING: $file has potential spelling errors (see above)${NC}"
        # Don't fail on spelling
      fi
    fi

    # Check for TODO/FIXME comments (optional warning)
    if grep -n -i 'TODO\|FIXME' "$file" | head -n 5 | grep -q .; then
      echo -e "${YELLOW}INFO: $file contains TODO/FIXME comments${NC}"
    fi
  fi
done < <(git diff --cached --name-only --diff-filter=ACM | grep -E '\.(md|markdown)$')

if [[ $ERRORS -gt 0 ]]; then
  echo -e "${RED}Pre-push checks failed. Fix errors above before committing.${NC}"
  exit 1
else
  echo -e "${GREEN}All pre-push checks passed.${NC}"
fi