"""Схемы заказов CRM.

Поля валидируются напрямую из "сырых" PascalCase-ключей ответа CRM через
`Field(alias=...)`, а наружу (в JSON фронту) отдаются как чистые snake_case
имена. Денежные значения остаются строками "как есть" от CRM — конвенция
integer-kopecks из CLAUDE.md относится к будущим персистентным моделям
`Order`/`Receipt`, а не к этому read-only проксирующему эндпоинту.
"""

from __future__ import annotations

from datetime import datetime
from decimal import Decimal
from typing import TYPE_CHECKING, Any

from pydantic import BaseModel, ConfigDict, Field, field_validator

if TYPE_CHECKING:
    from app.db.models.order import Order
    from app.db.models.receipt import Receipt


class OrderGoodOut(BaseModel):
    model_config = ConfigDict(populate_by_name=True)

    id: str = Field(alias="ID")
    sku: str = Field(alias="SKU")
    name: str = Field(alias="Name")
    price: str = Field(alias="Price")
    quantity: str = Field(alias="Quantity")
    discount_amount: str | None = Field(default=None, alias="DiscountAmount")
    discount_percent: str | None = Field(default=None, alias="DiscountPercent")
    amount: str = Field(alias="Amount")


class OrderTotalOut(BaseModel):
    model_config = ConfigDict(populate_by_name=True)

    cost: str = Field(alias="Cost")
    quantity: str = Field(alias="Quantity")
    weight: str = Field(alias="Weight")
    discount_amount: str = Field(alias="DiscountAmount")
    discount_percent: str = Field(alias="DiscountPercent")
    amount: str = Field(alias="Amount")

    # CRM возвращает Quantity/Weight то числом, то строкой в зависимости от
    # заказа — приводим к строке единообразно для фронта.
    @field_validator("quantity", "weight", mode="before")
    @classmethod
    def _stringify(cls, value: Any) -> Any:
        return str(value) if value is not None else value


class OrderOut(BaseModel):
    model_config = ConfigDict(populate_by_name=True)

    id: str = Field(alias="ID")
    create_date_time: str = Field(alias="CreateDateTime")
    recipient_name: str | None = Field(default=None, alias="RecipientDName")
    recipient_phone: str | None = Field(default=None, alias="RecipientPhone")
    recipient_email: str | None = Field(default=None, alias="RecipientEmail")
    waybill_number: str | None = Field(default=None, alias="Waybill_Number")
    notes: str | None = Field(default=None, alias="Notes")
    total: OrderTotalOut = Field(alias="Total")
    goods: list[OrderGoodOut] = Field(default_factory=list, alias="Goods")


class OrderRowOut(BaseModel):
    """Ответ `GET /orders` — строится из локальной таблицы `orders`, не из CRM напрямую."""

    model_config = ConfigDict(from_attributes=True)

    id: str
    create_date_time: datetime
    recipient_name: str | None
    recipient_phone: str | None
    recipient_email: str | None
    waybill_number: str | None
    notes: str | None
    total_amount: str
    goods: list[OrderGoodOut]
    has_receipt: bool
    np_status: str | None
    np_status_code: str | None
    np_cod_amount: str | None
    np_payment_status: str | None
    # Последний ЕТТН-чек по заказу (в т.ч. отменённый/неудачный — для показа причины).
    receipt_id: str | None = None
    receipt_status: str | None = None
    receipt_error: str | None = None
    receipt_prepayment: str | None = None
    edited: bool = False

    @classmethod
    def from_order(cls, order: Order, receipt: Receipt | None = None) -> OrderRowOut:
        return cls(
            id=order.id,
            create_date_time=order.create_date_time,
            recipient_name=order.recipient_name,
            recipient_phone=order.recipient_phone,
            recipient_email=order.recipient_email,
            waybill_number=order.waybill_number,
            notes=order.notes,
            total_amount=f"{order.total_amount_kopecks / 100:.2f}",
            goods=[OrderGoodOut.model_validate(good) for good in order.goods],
            has_receipt=order.receipt_created_at is not None,
            np_status=order.np_status,
            np_status_code=order.np_status_code,
            np_cod_amount=(
                f"{order.np_cod_amount_kopecks / 100:.2f}"
                if order.np_cod_amount_kopecks is not None
                else None
            ),
            np_payment_status=order.np_payment_status,
            receipt_id=str(receipt.id) if receipt else None,
            receipt_status=receipt.status.value if receipt else None,
            receipt_error=receipt.error if receipt else None,
            receipt_prepayment=(
                f"{receipt.prepayment_kopecks / 100:.2f}" if receipt else None
            ),
            edited=order.edited_at is not None,
        )


class OrderGoodIn(BaseModel):
    """Позиция заказа из формы редактирования. `amount` считает сервер."""

    id: str | None = Field(default=None, max_length=64)
    sku: str = Field(default="", max_length=128)
    name: str = Field(min_length=1, max_length=512)
    price: Decimal = Field(ge=0, max_digits=12, decimal_places=2)
    quantity: Decimal = Field(gt=0, max_digits=12, decimal_places=3)
    discount_amount: Decimal = Field(default=Decimal(0), ge=0, max_digits=12, decimal_places=2)

    @field_validator("sku", "name", mode="after")
    @classmethod
    def _strip(cls, value: str) -> str:
        return value.strip()


class OrderUpdateIn(BaseModel):
    """`PATCH /orders/{id}` — полная замена редактируемых полей заказа."""

    recipient_name: str | None = Field(default=None, max_length=255)
    recipient_phone: str | None = Field(default=None, max_length=32)
    recipient_email: str | None = Field(default=None, max_length=320)
    waybill_number: str | None = Field(default=None, max_length=64)
    notes: str | None = None
    total_amount: Decimal = Field(ge=0, max_digits=12, decimal_places=2)
    goods: list[OrderGoodIn] = Field(min_length=1)

    # Пустая строка из формы = «не указано».
    @field_validator(
        "recipient_name", "recipient_phone", "recipient_email", "waybill_number", "notes"
    )
    @classmethod
    def _blank_to_none(cls, value: str | None) -> str | None:
        if value is None:
            return None
        return value.strip() or None