#!/usr/bin/env python
"""
Cleanup verified but inactive user accounts.
Identifies and removes bot-created or unused accounts that:
- Are verified (is_verified = True)
- Have never logged in (no SystemEvent login records)
- Have never created time entries
- Are older than a specified number of days

This script can be run manually or scheduled via cron.
"""

import os
import sys
from datetime import datetime, timedelta
from sqlalchemy import and_, or_

# Add the application path to Python path
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))

from app import app, db
from models import User, Company, SystemEvent, TimeEntry
from models.enums import Role

def find_inactive_verified_accounts(min_age_days=30, dry_run=False):
    """
    Find verified user accounts that have never been used.

    Args:
        min_age_days (int): Minimum age in days for accounts to be considered
        dry_run (bool): If True, only show what would be deleted without actually deleting.

    Returns:
        tuple: (accounts_to_delete, details_list)
    """
    with app.app_context():
        cutoff_time = datetime.utcnow() - timedelta(days=min_age_days)

        # Find verified accounts older than cutoff
        verified_old_users = User.query.filter(
            and_(
                User.is_verified == True,
                User.created_at < cutoff_time
            )
        ).all()

        inactive_accounts = []

        for user in verified_old_users:
            # Check if user has any time entries
            time_entry_count = TimeEntry.query.filter_by(user_id=user.id).count()

            # Check if user has any login events
            login_event_count = SystemEvent.query.filter(
                and_(
                    SystemEvent.user_id == user.id,
                    SystemEvent.event_type == 'user_login'
                )
            ).count()

            # If no time entries and no logins, this is an inactive account
            if time_entry_count == 0 and login_event_count == 0:
                account_age_days = (datetime.utcnow() - user.created_at).days

                # Get company info
                company = Company.query.get(user.company_id) if user.company_id else None
                company_name = company.name if company else "Unknown"

                # Check if user is the only admin in their company
                is_only_admin = False
                if user.role in [Role.ADMIN, Role.SYSTEM_ADMIN]:
                    other_admins = User.query.filter(
                        and_(
                            User.company_id == user.company_id,
                            User.id != user.id,
                            User.role.in_([Role.ADMIN, Role.SYSTEM_ADMIN])
                        )
                    ).count()
                    is_only_admin = (other_admins == 0)

                inactive_accounts.append({
                    'user': user,
                    'company_name': company_name,
                    'age_days': account_age_days,
                    'is_only_admin': is_only_admin,
                    'company': company
                })

        return inactive_accounts


def cleanup_inactive_accounts(min_age_days=30, dry_run=False, skip_admins=True):
    """
    Delete inactive verified accounts.

    Args:
        min_age_days (int): Minimum age in days for accounts to be considered
        dry_run (bool): If True, only show what would be deleted without actually deleting
        skip_admins (bool): If True, skip accounts that are the only admin in their company

    Returns:
        int: Number of accounts deleted (or would be deleted in dry run mode)
    """
    with app.app_context():
        inactive_accounts = find_inactive_verified_accounts(min_age_days, dry_run)

        deleted_count = 0
        skipped_count = 0
        companies_deleted = 0

        print(f"\nFound {len(inactive_accounts)} inactive verified account(s) older than {min_age_days} days")
        print("=" * 80)

        for account_info in inactive_accounts:
            user = account_info['user']
            company_name = account_info['company_name']
            age_days = account_info['age_days']
            is_only_admin = account_info['is_only_admin']
            company = account_info['company']

            # Skip if this is the only admin and skip_admins is True
            if is_only_admin and skip_admins:
                print(f"\nSKIPPED (only admin): {user.username}")
                print(f"  Email: {user.email}")
                print(f"  Company: {company_name} (ID: {user.company_id})")
                print(f"  Role: {user.role.value}")
                print(f"  Created: {user.created_at} ({age_days} days ago)")
                skipped_count += 1
                continue

            if dry_run:
                print(f"\nWOULD DELETE: {user.username}")
                print(f"  Email: {user.email}")
                print(f"  Company: {company_name} (ID: {user.company_id})")
                print(f"  Role: {user.role.value}")
                print(f"  Created: {user.created_at} ({age_days} days ago)")

                # Check if company would be deleted too
                if company:
                    other_users = User.query.filter(
                        and_(
                            User.company_id == user.company_id,
                            User.id != user.id
                        )
                    ).count()
                    if other_users == 0:
                        print(f"  -> Would also delete empty company: {company_name}")

                deleted_count += 1
            else:
                print(f"\nDELETING: {user.username}")
                print(f"  Email: {user.email}")
                print(f"  Company: {company_name} (ID: {user.company_id})")
                print(f"  Role: {user.role.value}")
                print(f"  Created: {user.created_at} ({age_days} days ago)")

                # Log the deletion as a system event
                try:
                    SystemEvent.log_event(
                        event_type='user_deleted',
                        event_category='system',
                        description=f'Inactive verified user {user.username} deleted (no activity for {age_days} days)',
                        user_id=None,  # No user context for system cleanup
                        company_id=user.company_id
                    )
                except Exception as e:
                    print(f"  Warning: Could not log deletion event: {e}")

                # Check if company should be deleted
                if company:
                    other_users = User.query.filter(
                        and_(
                            User.company_id == user.company_id,
                            User.id != user.id
                        )
                    ).count()

                    # Delete the user
                    db.session.delete(user)
                    deleted_count += 1

                    # If no other users, delete the company too
                    if other_users == 0:
                        print(f"  -> Also deleting empty company: {company_name}")
                        db.session.delete(company)
                        companies_deleted += 1
                else:
                    # Delete the user even if company doesn't exist
                    db.session.delete(user)
                    deleted_count += 1

        if not dry_run and deleted_count > 0:
            db.session.commit()
            print("\n" + "=" * 80)
            print(f"Successfully deleted {deleted_count} inactive account(s)")
            if companies_deleted > 0:
                print(f"Successfully deleted {companies_deleted} empty company/companies")
            if skipped_count > 0:
                print(f"Skipped {skipped_count} account(s) (only admin in company)")
        elif dry_run:
            print("\n" + "=" * 80)
            print(f"DRY RUN: Would delete {deleted_count} inactive account(s)")
            if skipped_count > 0:
                print(f"Would skip {skipped_count} account(s) (only admin in company)")
        else:
            print("\n" + "=" * 80)
            print("No inactive accounts found to delete")
            if skipped_count > 0:
                print(f"Skipped {skipped_count} account(s) (only admin in company)")

        return deleted_count


def generate_report(min_age_days=30):
    """
    Generate a detailed report of inactive accounts without deleting anything.

    Args:
        min_age_days (int): Minimum age in days for accounts to be considered
    """
    with app.app_context():
        inactive_accounts = find_inactive_verified_accounts(min_age_days, dry_run=True)

        print(f"\n{'='*80}")
        print(f"INACTIVE VERIFIED ACCOUNTS REPORT")
        print(f"Accounts older than {min_age_days} days with no activity")
        print(f"Generated: {datetime.utcnow()}")
        print(f"{'='*80}\n")

        if not inactive_accounts:
            print("No inactive verified accounts found.")
            return

        # Group by company
        by_company = {}
        for account_info in inactive_accounts:
            company_name = account_info['company_name']
            if company_name not in by_company:
                by_company[company_name] = []
            by_company[company_name].append(account_info)

        # Print summary
        print(f"Total inactive accounts: {len(inactive_accounts)}")
        print(f"Companies affected: {len(by_company)}\n")

        # Print details by company
        for company_name, accounts in sorted(by_company.items()):
            print(f"\nCompany: {company_name}")
            print("-" * 80)
            for account_info in accounts:
                user = account_info['user']
                age_days = account_info['age_days']
                is_only_admin = account_info['is_only_admin']

                admin_warning = " [ONLY ADMIN]" if is_only_admin else ""
                print(f"  • {user.username}{admin_warning}")
                print(f"    Email: {user.email or 'N/A'}")
                print(f"    Role: {user.role.value}")
                print(f"    Created: {user.created_at} ({age_days} days ago)")
                print()


def main():
    """Main function to handle command line arguments"""
    import argparse

    parser = argparse.ArgumentParser(
        description='Cleanup verified but inactive user accounts (no logins, no time entries)'
    )
    parser.add_argument(
        '--dry-run',
        action='store_true',
        help='Show what would be deleted without actually deleting'
    )
    parser.add_argument(
        '--min-age',
        type=int,
        default=30,
        help='Minimum account age in days (default: 30)'
    )
    parser.add_argument(
        '--include-admins',
        action='store_true',
        help='Include accounts that are the only admin in their company (default: skip them)'
    )
    parser.add_argument(
        '--report-only',
        action='store_true',
        help='Generate a detailed report only, do not delete anything'
    )
    parser.add_argument(
        '--quiet',
        action='store_true',
        help='Suppress output except for errors'
    )

    args = parser.parse_args()

    if not args.quiet:
        print(f"Starting cleanup of inactive verified accounts at {datetime.utcnow()}")
        print("-" * 80)

    try:
        if args.report_only:
            generate_report(min_age_days=args.min_age)
        else:
            deleted_count = cleanup_inactive_accounts(
                min_age_days=args.min_age,
                dry_run=args.dry_run,
                skip_admins=not args.include_admins
            )

        if not args.quiet:
            print("-" * 80)
            print(f"Cleanup completed at {datetime.utcnow()}")

        # Exit with 0 for success
        sys.exit(0)
    except Exception as e:
        print(f"Error during cleanup: {str(e)}", file=sys.stderr)
        import traceback
        traceback.print_exc()
        sys.exit(1)


if __name__ == '__main__':
    main()