"""Seed obviously-fake demo data so the fixture is non-empty on first boot."""

import logging
from datetime import datetime, timedelta
from decimal import Decimal

from db import SessionLocal
from models import Customer, Invoice, LineItem, Payment

log = logging.getLogger(__name__)


def seed_if_empty() -> None:
    session = SessionLocal()
    try:
        if session.query(Customer).count() > 0:
            return

        log.info("Seeding fixture data…")
        acme = Customer(name="Acme Widget Co.", email="billing@acme.example")
        test = Customer(name="Test Customer 001", email="test@example.invalid")
        session.add_all([acme, test])
        session.flush()

        inv1 = Invoice(
            number="DEMO-2026-001",
            customer_id=acme.id,
            issued_at=datetime(2026, 1, 15),
            due_at=datetime(2026, 2, 15),
            status="sent",
        )
        inv2 = Invoice(
            number="DEMO-2026-002",
            customer_id=acme.id,
            issued_at=datetime(2026, 2, 1),
            due_at=datetime(2026, 3, 1),
            status="paid",
        )
        inv3 = Invoice(
            number="DEMO-2026-003",
            customer_id=test.id,
            issued_at=datetime(2026, 3, 10),
            due_at=datetime(2026, 4, 10),
            status="draft",
        )
        session.add_all([inv1, inv2, inv3])
        session.flush()

        session.add_all([
            LineItem(invoice_id=inv1.id, description="Widget type A", quantity=10, unit_price=Decimal("19.99")),
            LineItem(invoice_id=inv1.id, description="Widget type B", quantity=5, unit_price=Decimal("49.00")),
            LineItem(invoice_id=inv2.id, description="Consulting (hours)", quantity=8, unit_price=Decimal("120.00")),
            LineItem(invoice_id=inv3.id, description="Placeholder line item", quantity=1, unit_price=Decimal("0")),
        ])

        session.add_all([
            Payment(invoice_id=inv2.id, amount=Decimal("960.00"), method="transfer", paid_at=datetime(2026, 2, 20)),
            Payment(invoice_id=inv1.id, amount=Decimal("100.00"), method="card", paid_at=datetime(2026, 2, 1)),
        ])

        session.commit()
        log.info("Seed complete.")
    finally:
        session.close()