"""
app/admin/analytics/routes.py
Platform analytics dashboard: active tenants, MRR, trial conversions,
churn rate, tenant health signals.
"""

import logging
from datetime import datetime, timezone, timedelta

from flask import Blueprint, render_template
from flask_login import login_required
from sqlalchemy import func

from app.extensions import db
from app.models.platform import Tenant, Plan, TenantBillingHistory
from app.admin.utils import superadmin_required

logger = logging.getLogger(__name__)

analytics_bp = Blueprint("analytics", __name__, url_prefix="/analytics")


@analytics_bp.route("/")
@login_required
@superadmin_required
def index():
    now = datetime.now(timezone.utc)
    thirty_days_ago = now - timedelta(days=30)

    # ── Tenant counts by status ───────────────────────────────
    counts = (
        db.session.query(Tenant.status, func.count(Tenant.id))
        .group_by(Tenant.status)
        .all()
    )
    status_counts = {s: c for s, c in counts}
    total_tenants = sum(status_counts.values())
    active_count = status_counts.get("active", 0)
    trial_count = status_counts.get("trial", 0)
    suspended_count = status_counts.get("suspended", 0)
    cancelled_count = status_counts.get("cancelled", 0)

    # ── MRR — sum of monthly prices for active non-demo tenants ──
    mrr_rows = (
        db.session.query(Plan.price_monthly, func.count(Tenant.id))
        .join(Tenant, Tenant.plan_id == Plan.id)
        .filter(Tenant.status == "active", Tenant.is_demo == False)  # noqa: E712
        .group_by(Plan.price_monthly)
        .all()
    )
    mrr = sum(price * count for price, count in mrr_rows)

    # ── Trial conversions last 30 days ───────────────────────
    converted = Tenant.query.filter(
        Tenant.status == "active",
        Tenant.trial_ends_at >= thirty_days_ago,
        Tenant.trial_ends_at <= now,
    ).count()

    # ── Churn last 30 days ────────────────────────────────────
    churned = Tenant.query.filter(
        Tenant.status.in_(["suspended", "cancelled"]),
        Tenant.updated_at >= thirty_days_ago,
    ).count()

    # ── New tenants last 30 days ─────────────────────────────
    new_tenants = Tenant.query.filter(
        Tenant.created_at >= thirty_days_ago
    ).count()

    # ── Tenant health table (trials expiring soon) ────────────
    expiring_soon = Tenant.query.filter(
        Tenant.status == "trial",
        Tenant.trial_ends_at <= now + timedelta(days=3),
        Tenant.trial_ends_at >= now,
    ).order_by(Tenant.trial_ends_at.asc()).all()

    # ── Revenue last 30 days (from billing history) ───────────
    revenue_30d_row = db.session.query(
        func.sum(TenantBillingHistory.amount)
    ).filter(
        TenantBillingHistory.created_at >= thirty_days_ago
    ).scalar()
    revenue_30d = float(revenue_30d_row or 0)

    # ── Tenants by plan ───────────────────────────────────────
    plan_counts = (
        db.session.query(Plan.name, func.count(Tenant.id))
        .join(Tenant, Tenant.plan_id == Plan.id)
        .filter(Tenant.status.in_(["active", "trial"]))
        .group_by(Plan.name)
        .all()
    )

    stats = {
        "total_tenants": total_tenants,
        "active_count": active_count,
        "trial_count": trial_count,
        "suspended_count": suspended_count,
        "cancelled_count": cancelled_count,
        "mrr": mrr,
        "converted_30d": converted,
        "churned_30d": churned,
        "new_tenants_30d": new_tenants,
        "revenue_30d": revenue_30d,
        "plan_counts": plan_counts,
    }

    return render_template(
        "admin/analytics/index.html",
        stats=stats,
        expiring_soon=expiring_soon,
        now=now,
    )