#!/bin/bash
set -euo pipefail
# SEC-202: Secrets audit — checks for hardcoded credentials in the codebase.
# Scans source files for common secret patterns.

REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
PASS=0
FAIL=0
RESULTS=()

log() { echo -e "\033[1;34m[AUDIT]\033[0m $*"; }
pass() { echo -e "\033[1;32m[PASS]\033[0m $*"; PASS=$((PASS + 1)); RESULTS+=("PASS: $*"); }
fail() { echo -e "\033[1;31m[FAIL]\033[0m $*"; FAIL=$((FAIL + 1)); RESULTS+=("FAIL: $*"); }

# Patterns to search for (case insensitive)
PATTERNS=(
  "password\s*=\s*['\"][^'\"]*['\"]"
  "api_key\s*=\s*['\"][^'\"]*['\"]"
  "secret\s*=\s*['\"][^'\"]*['\"]"
  "private_key\s*=\s*['\"][^'\"]*['\"]"
  "sk-ant-"
  "AKIA[A-Z0-9]{16}"
  "ghp_[a-zA-Z0-9]{36}"
  "glpat-[a-zA-Z0-9_-]{20}"
)

# Allowed files (config templates, docs, test fixtures)
ALLOW_PATTERNS="test|mock|example|template|CLAUDE.md|deploy-config|\.md$|node_modules|dist|target|default\)|grep.*rpc|audit-secrets"

main() {
  log "=== Secrets Audit ==="
  echo ""

  # 1. Check for .env files in version control
  log "1. Checking for .env files in git..."
  local env_files
  env_files=$(cd "$REPO_ROOT" && git ls-files '*.env' '.env*' 2>/dev/null || echo "")
  if [ -z "$env_files" ]; then
    pass "No .env files tracked in git"
  else
    fail "Found .env files in git: $env_files"
  fi

  # 2. Check .gitignore includes sensitive patterns
  log "2. Checking .gitignore coverage..."
  local gitignore="$REPO_ROOT/.gitignore"
  if [ -f "$gitignore" ]; then
    local has_env has_key
    has_env=$(grep -c '\.env' "$gitignore" || echo 0)
    has_key=$(grep -c 'credentials\|\.key\|\.pem' "$gitignore" || echo 0)
    if [ "$has_env" -gt 0 ]; then
      pass ".gitignore covers .env files"
    else
      fail ".gitignore missing .env pattern"
    fi
  else
    fail "No .gitignore found"
  fi

  # 3. Scan source for hardcoded credentials
  log "3. Scanning source for hardcoded secrets..."
  local found_secrets=0
  for pattern in "${PATTERNS[@]}"; do
    local matches
    matches=$(cd "$REPO_ROOT" && grep -rniE "$pattern" \
      --include='*.rs' --include='*.ts' --include='*.vue' --include='*.js' \
      --include='*.json' --include='*.sh' --include='*.py' \
      2>/dev/null | grep -vE "$ALLOW_PATTERNS" || echo "")
    if [ -n "$matches" ]; then
      # Filter out false positives (empty strings, variable declarations, etc.)
      local real_matches
      real_matches=$(echo "$matches" | grep -vE '""|\x27\x27|None|null|undefined|TODO|placeholder|example|Option<' || echo "")
      if [ -n "$real_matches" ]; then
        echo "  WARNING: Pattern '$pattern' found:"
        echo "$real_matches" | head -5 | sed 's/^/    /'
        found_secrets=$((found_secrets + 1))
      fi
    fi
  done
  if [ "$found_secrets" -eq 0 ]; then
    pass "No hardcoded secrets found in source"
  else
    fail "Found $found_secrets secret pattern matches (review above)"
  fi

  # 4. Check deploy-config is gitignored
  log "4. Checking deploy-config.sh is gitignored..."
  if cd "$REPO_ROOT" && git check-ignore scripts/deploy-config.sh > /dev/null 2>&1; then
    pass "scripts/deploy-config.sh is gitignored"
  elif [ -f "$REPO_ROOT/scripts/deploy-config.sh" ]; then
    fail "scripts/deploy-config.sh exists but is NOT gitignored"
  else
    pass "scripts/deploy-config.sh does not exist (using env vars)"
  fi

  # 5. Check for credential files in repo
  log "5. Checking for credential files..."
  local cred_files
  cred_files=$(cd "$REPO_ROOT" && git ls-files '*.pem' '*.key' '*macaroon*' 2>/dev/null | grep -v '\.rs$' | grep -v '\.ts$' || echo "")
  if [ -z "$cred_files" ]; then
    pass "No credential files tracked in git"
  else
    fail "Credential files in git: $cred_files"
  fi

  echo ""
  log "=== RESULTS ==="
  for r in "${RESULTS[@]}"; do
    echo "  $r"
  done
  echo ""
  log "Pass: $PASS | Fail: $FAIL"

  [ $FAIL -gt 0 ] && exit 1
  exit 0
}

main "$@"