import json

def load_user_records(filepath):

"""Loads user records from a JSON file."""

try:

with open(filepath, 'r') as f:

user_records = json.load(f)

return user_records

except FileNotFoundError:

print(f"Error: File not found at {filepath}")

return []

except json.JSONDecodeError:

print(f"Error: Invalid JSON format in {filepath}")

return []

def validate_user_record(user):

"""Performs basic sanity checks on a user record."""

if not isinstance(user, dict):

print(f"Error: User record is not a dictionary: {user}")

return False

if 'user_id' not in user or not isinstance(user['user_id'], (int, str)):

print(f"Error: Missing or invalid user_id: {user}")

return False

if 'email' not in user or not isinstance(user['email'], str):

print(f"Error: Missing or invalid email: {user}")

return False

if not user['email'].contains('@'):

print(f"Error: Invalid email format: {user}")

return False

if 'username' not in user or not isinstance(user['username'], str):

print(f"Error: Missing or invalid username: {user}")

return False

if not user['username']:

print(f"Error: Username cannot be empty: {user}")

return False

return True

def process_user_records(filepath):

"""Loads, validates, and prints user records."""

user_records = load_user_records(filepath)

if not user_records:

print("No user records to process.")

return

valid_records = []

invalid_count = 0

for user in user_records:

if validate_user_record(user):

valid_records.append(user)

else:

invalid_count += 1

print(f"Total user records: {len(user_records)}")

print(f"Valid user records: {len(valid_records)}")

print(f"Invalid user records: {invalid_count}")

# Optionally print the valid records

# for record in valid_records:

# print(record)

if __name__ == "__main__":

# Example usage:

# Replace 'user_records.json' with your actual file path

process_user_records('user_records.json')