"""Analytics service for platform-wide statistics."""
import logging
from datetime import datetime, timedelta, timezone
from gatehouse_app.models.organization.organization import Organization
from gatehouse_app.models.user.user import User
from gatehouse_app.models.user.session import Session
from gatehouse_app.models.superadmin_audit_log import SuperadminAuditLog

logger = logging.getLogger(__name__)


class SuperadminAnalyticsService:
    """Service for platform-wide analytics and statistics."""

    @staticmethod
    def get_dashboard_stats() -> dict:
        """Get dashboard statistics for the overview page.

        Returns:
            Dashboard stats including org count, user count, etc.
        """
        now = datetime.now(timezone.utc)
        thirty_days_ago = now - timedelta(days=30)

        # Total organizations
        total_orgs = Organization.query.filter(Organization.deleted_at.is_(None)).count()
        active_orgs = Organization.query.filter(
            Organization.deleted_at.is_(None),
            Organization.is_active == True,  # noqa: E712
        ).count()

        # Total users
        total_users = User.query.filter(User.deleted_at.is_(None)).count()

        # Active sessions
        active_sessions = Session.query.filter(
            Session.deleted_at.is_(None),
            Session.status == "active",
        ).count()

        # New signups in last 30 days
        new_users_30d = User.query.filter(
            User.deleted_at.is_(None),
            User.created_at >= thirty_days_ago,
        ).count()

        # New organizations in last 30 days
        new_orgs_30d = Organization.query.filter(
            Organization.deleted_at.is_(None),
            Organization.created_at >= thirty_days_ago,
        ).count()

        # Suspended organizations
        suspended_orgs = Organization.query.filter(
            Organization.deleted_at.is_(None),
            Organization.is_active == False,  # noqa: E712
        ).count()

        return {
            "total_organizations": total_orgs,
            "active_organizations": active_orgs,
            "suspended_organizations": suspended_orgs,
            "total_users": total_users,
            "active_sessions": active_sessions,
            "new_users_30d": new_users_30d,
            "new_orgs_30d": new_orgs_30d,
            "generated_at": now.isoformat() + "Z",
        }

    @staticmethod
    def get_signup_trends(days: int = 30) -> dict:
        """Get signup trends over time.

        Args:
            days: Number of days to analyze

        Returns:
            Daily signup data
        """
        now = datetime.now(timezone.utc)
        start_date = now - timedelta(days=days)

        # Get all users created in period
        users = User.query.filter(
            User.deleted_at.is_(None),
            User.created_at >= start_date,
        ).all()

        # Group by day
        daily_signups = {}
        for i in range(days):
            date = (start_date + timedelta(days=i)).strftime("%Y-%m-%d")
            daily_signups[date] = 0

        for user in users:
            date = user.created_at.strftime("%Y-%m-%d")
            if date in daily_signups:
                daily_signups[date] += 1

        # Convert to list
        history = [
            {"date": date, "value": count}
            for date, count in sorted(daily_signups.items())
        ]

        return {
            "period_start": start_date.isoformat() + "Z",
            "period_end": now.isoformat() + "Z",
            "total": len(users),
            "history": history,
        }

    @staticmethod
    def get_org_distribution() -> dict:
        """Get distribution of organizations by size.

        Returns:
            Organization size distribution
        """
        orgs = Organization.query.filter(Organization.deleted_at.is_(None)).all()
        
        distribution = {
            "solo": 0,      # 1 user
            "small": 0,     # 2-10 users
            "medium": 0,    # 11-50 users
            "large": 0,     # 51-200 users
            "enterprise": 0, # 200+ users
        }

        for org in orgs:
            count = org.get_member_count()
            if count == 1:
                distribution["solo"] += 1
            elif count <= 10:
                distribution["small"] += 1
            elif count <= 50:
                distribution["medium"] += 1
            elif count <= 200:
                distribution["large"] += 1
            else:
                distribution["enterprise"] += 1

        return {
            "distribution": distribution,
            "total_orgs": len(orgs),
        }

    @staticmethod
    def get_recent_activity(limit: int = 20) -> list:
        """Get recent superadmin actions.

        Args:
            limit: Maximum number of actions to return

        Returns:
            List of recent audit log entries
        """
        logs = SuperadminAuditLog.query.filter(
            SuperadminAuditLog.deleted_at.is_(None),
        ).order_by(
            SuperadminAuditLog.created_at.desc()
        ).limit(limit).all()

        return [
            {
                "id": log.id,
                "superadmin_id": log.superadmin_id,
                "action": log.action,
                "resource_type": log.resource_type,
                "resource_id": log.resource_id,
                "extra_data": log.extra_data,
                "ip_address": log.ip_address,
                "user_agent": log.user_agent,
                "created_at": log.created_at.isoformat() + "Z" if log.created_at else None,
            }
            for log in logs
        ]