import random
from datetime import datetime

from app.core.settings import settings
from app.db.mock_database import SessionMockLocal
from app.db.mock_models import Customer, Order, Vehicle


VEHICLE_MODELS = [
    "Toyota Corolla",
    "Honda Civic",
    "Chevrolet Onix",
    "Hyundai HB20",
    "Volkswagen T-Cross",
    "Jeep Compass",
    "Fiat Argo",
    "Nissan Kicks",
    "Renault Duster",
    "Ford Ranger",
]

CATEGORIES = ["hatch", "sedan", "suv", "pickup"]
NAMES = [
    "Ana Souza",
    "Bruno Lima",
    "Carla Mendes",
    "Diego Santos",
    "Eduarda Alves",
    "Felipe Rocha",
    "Gabriela Costa",
    "Henrique Martins",
    "Isabela Ferreira",
    "Joao Ribeiro",
]

TARGET_VEHICLE_COUNT = 180
TARGET_CUSTOMER_COUNT = 320
TARGET_ORDER_COUNT = 80
VEHICLE_PRICE_BANDS = (
    38990,
    42990,
    46990,
    50990,
    54990,
    58990,
    62990,
    66990,
    69990,
    73990,
    77990,
    82990,
    87990,
    93990,
    99990,
    106990,
    114990,
    123990,
    132990,
    141990,
)


def _cpf_from_index(index: int) -> str:
    """Gera um CPF numerico deterministico de 11 digitos a partir do indice."""
    return str(10_000_000_000 + index).zfill(11)


def _vehicle_price_from_index(index: int, rng: random.Random) -> float:
    band_price = VEHICLE_PRICE_BANDS[index % len(VEHICLE_PRICE_BANDS)]
    cycle_increment = (index // len(VEHICLE_PRICE_BANDS)) * 750
    noise = rng.randint(-1800, 2200)
    return float(max(35000, band_price + cycle_increment + noise))


def _seed_vehicle_records(existing_count: int, target_count: int, rng: random.Random) -> list[Vehicle]:
    vehicles = []
    for idx in range(existing_count, target_count):
        model = VEHICLE_MODELS[idx % len(VEHICLE_MODELS)]
        category = CATEGORIES[idx % len(CATEGORIES)]
        vehicles.append(
            Vehicle(
                modelo=f"{model} {2020 + (idx % 6)}",
                categoria=category,
                preco=_vehicle_price_from_index(idx, rng),
            )
        )
    return vehicles


def _seed_customer_records(existing_count: int, target_count: int) -> list[Customer]:
    customers = []
    for idx in range(existing_count, target_count):
        entropy = (idx * 9973) % 10_000
        customers.append(
            Customer(
                cpf=_cpf_from_index(idx),
                nome=f"{NAMES[idx % len(NAMES)]} {idx + 1}",
                score=300 + (entropy % 550),
                limite_credito=float(30_000 + (entropy * 12)),
                possui_restricao=(idx % 11 == 0),
            )
        )
    return customers


def _seed_order_records(existing_count: int, target_count: int) -> list[Order]:
    orders = []
    created = datetime(2026, 1, 1, 8, 0, 0)
    for idx in range(existing_count, target_count):
        orders.append(
            Order(
                numero_pedido=f"PED-MOCK-2026-{idx + 1:05d}",
                cpf=_cpf_from_index(idx),
                status="Ativo",
                created_at=created,
            )
        )
    return orders


def seed_mock_data() -> None:
    """Popula dados mock iniciais de veiculos, clientes e pedidos quando habilitado."""
    if not settings.mock_seed_enabled:
        return

    rng = random.Random(42)
    db = SessionMockLocal()
    try:
        vehicle_count = db.query(Vehicle).count()
        if vehicle_count < TARGET_VEHICLE_COUNT:
            vehicles = _seed_vehicle_records(
                existing_count=vehicle_count,
                target_count=TARGET_VEHICLE_COUNT,
                rng=rng,
            )
            db.add_all(vehicles)
            db.commit()

        customer_count = db.query(Customer).count()
        if customer_count < TARGET_CUSTOMER_COUNT:
            customers = _seed_customer_records(
                existing_count=customer_count,
                target_count=TARGET_CUSTOMER_COUNT,
            )
            db.add_all(customers)
            db.commit()

        order_count = db.query(Order).count()
        if order_count < TARGET_ORDER_COUNT:
            orders = _seed_order_records(
                existing_count=order_count,
                target_count=TARGET_ORDER_COUNT,
            )
            db.add_all(orders)
            db.commit()
    finally:
        db.close()