"""
app/admin/billing/routes.py
Billing history: manual invoice entry per tenant, list view.
All entries logged. Superadmin only.
"""

import logging
from datetime import datetime, timezone

from flask import Blueprint, render_template, redirect, url_for, flash, request
from flask_login import login_required, current_user

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

logger = logging.getLogger(__name__)

billing_bp = Blueprint("billing", __name__, url_prefix="/billing")


@billing_bp.route("/")
@login_required
@superadmin_required
def index():
    entries = (
        TenantBillingHistory.query
        .order_by(TenantBillingHistory.created_at.desc())
        .limit(100)
        .all()
    )
    return render_template("admin/billing/index.html", entries=entries)


@billing_bp.route("/tenant/<int:tenant_id>")
@login_required
@superadmin_required
def tenant_billing(tenant_id):
    tenant = Tenant.query.get_or_404(tenant_id)
    entries = (
        TenantBillingHistory.query
        .filter_by(tenant_id=tenant_id)
        .order_by(TenantBillingHistory.created_at.desc())
        .all()
    )
    return render_template("admin/billing/tenant.html", tenant=tenant, entries=entries)


@billing_bp.route("/tenant/<int:tenant_id>/add", methods=["GET", "POST"])
@login_required
@superadmin_required
def add_entry(tenant_id):
    tenant = Tenant.query.get_or_404(tenant_id)

    if request.method == "POST":
        try:
            amount = float(request.form.get("amount", 0))
        except ValueError:
            return render_template("admin/billing/form.html", tenant=tenant,
                                   error="Invalid amount.")
        description = request.form.get("description", "").strip()
        invoice_ref = request.form.get("invoice_ref", "").strip() or None
        paid_at_raw = request.form.get("paid_at", "").strip()
        paid_at = None
        if paid_at_raw:
            try:
                paid_at = datetime.fromisoformat(paid_at_raw)
            except ValueError:
                pass

        if not description:
            return render_template("admin/billing/form.html", tenant=tenant,
                                   error="Description is required.")

        entry = TenantBillingHistory(
            tenant_id=tenant_id, amount=amount, description=description,
            invoice_ref=invoice_ref, paid_at=paid_at,
            recorded_by=current_user.id,
        )
        db.session.add(entry)
        db.session.flush()
        log_admin_action(
            "billing.add_entry", "tenant", tenant_id,
            after={"amount": amount, "description": description, "invoice_ref": invoice_ref},
        )
        db.session.commit()
        logger.info("Billing entry added: tenant_id=%s amount=%s by=%s",
                    tenant_id, amount, current_user.id)
        flash(f"Billing entry added for \'{tenant.name}\'.", "success")
        return redirect(url_for("billing.tenant_billing", tenant_id=tenant_id))

    return render_template("admin/billing/form.html", tenant=tenant)