#!/bin/bash
# Pre-commit hook: blocks commits that change files without a corresponding task.
# Install via: scripts/install-hooks.sh
set -e

TASKS_DIR="tasks"

# Get list of changed files (staged)
CHANGED_FILES=$(git diff --cached --name-only --diff-filter=ACMR | grep -v "^$TASKS_DIR/" || true)

if [ -z "$CHANGED_FILES" ]; then
  exit 0
fi

# Check if any task spec mentions the changed files
matches=""
for file in $CHANGED_FILES; do
  basename=$(basename "$file")
  # Search for the filename or path in all task SPEC.md files
  if grep -q -r "$basename\|$file" "$TASKS_DIR" --include="SPEC.md" 2>/dev/null; then
    matches="$matches $file"
  fi
done

# Count how many changed files are matched
matched_count=$(echo "$matches" | tr ' ' '\n' | sort -u | grep -c . || true)
total_count=$(echo "$CHANGED_FILES" | grep -c . || true)

if [ "$matched_count" -ge "$total_count" ]; then
  exit 0
fi

# Some files lack task coverage — warn and ask
echo ""
echo "=== TASK ENFORCEMENT ==="
echo "Changed files not covered by any task in $TASKS_DIR/:"
for file in $CHANGED_FILES; do
  if ! echo "$matches" | grep -q "$file"; then
    echo "  - $file"
  fi
done
echo ""
echo "The .rules.md requires all changes to go through a task."
echo "Create a task in $TASKS_DIR/{name}/SPEC.md first,"
echo "or use 'git commit --no-verify' to bypass this check."
echo ""
read -p "Continue without a task? (y/N) " -n 1 -r
echo
if [[ ! $REPLY =~ ^[Yy]$ ]]; then
  echo "Commit blocked. Create a task for your changes first."
  exit 1
fi