# models/schema/order.py
"""
Pydantic schema for order operations.
"""

from datetime import datetime
from typing import List, Optional
from decimal import Decimal
from pydantic import BaseModel, Field, ConfigDict


# ============================================================================
# Order Item Schemas
# ============================================================================

class OrderItemCreate(BaseModel):
    """Schema for creating an order item."""
    product_id: int
    quantity: int = Field(..., ge=1)


class OrderItemResponse(BaseModel):
    """Schema for order item response."""
    model_config = ConfigDict(from_attributes=True)

    id: int
    order_id: int
    product_id: int
    product_name: str
    product_sku: Optional[str]
    quantity: int
    unit_price: float
    total_price: float
    inventory_reserved: bool
    inventory_fulfilled: bool
    created_at: datetime
    updated_at: datetime


# ============================================================================
# Order Address Schemas
# ============================================================================

class OrderAddressCreate(BaseModel):
    """Schema for order address (shipping/billing)."""
    first_name: str = Field(..., min_length=1, max_length=100)
    last_name: str = Field(..., min_length=1, max_length=100)
    company: Optional[str] = Field(None, max_length=200)
    address_line_1: str = Field(..., min_length=1, max_length=255)
    address_line_2: Optional[str] = Field(None, max_length=255)
    city: str = Field(..., min_length=1, max_length=100)
    postal_code: str = Field(..., min_length=1, max_length=20)
    country: str = Field(..., min_length=2, max_length=100)


class OrderAddressResponse(BaseModel):
    """Schema for order address response."""
    model_config = ConfigDict(from_attributes=True)

    id: int
    address_type: str
    first_name: str
    last_name: str
    company: Optional[str]
    address_line_1: str
    address_line_2: Optional[str]
    city: str
    postal_code: str
    country: str


# ============================================================================
# Order Create/Update Schemas
# ============================================================================

class OrderCreate(BaseModel):
    """Schema for creating an order."""
    customer_id: Optional[int] = None  # Optional for guest checkout
    items: List[OrderItemCreate] = Field(..., min_length=1)

    # Addresses
    shipping_address: OrderAddressCreate
    billing_address: Optional[OrderAddressCreate] = None  # Use shipping if not provided

    # Optional fields
    shipping_method: Optional[str] = None
    customer_notes: Optional[str] = Field(None, max_length=1000)

    # Cart/session info
    session_id: Optional[str] = None


class OrderUpdate(BaseModel):
    """Schema for updating order status."""
    status: Optional[str] = Field(
        None,
        pattern="^(pending|processing|shipped|delivered|cancelled|refunded)$"
    )
    tracking_number: Optional[str] = None
    internal_notes: Optional[str] = None


# ============================================================================
# Order Response Schemas
# ============================================================================

class OrderResponse(BaseModel):
    """Schema for order response."""
    model_config = ConfigDict(from_attributes=True)

    id: int
    vendor_id: int
    customer_id: int
    order_number: str
    status: str

    # Financial
    subtotal: float
    tax_amount: float
    shipping_amount: float
    discount_amount: float
    total_amount: float
    currency: str

    # Shipping
    shipping_method: Optional[str]
    tracking_number: Optional[str]

    # Notes
    customer_notes: Optional[str]
    internal_notes: Optional[str]

    # Timestamps
    created_at: datetime
    updated_at: datetime
    paid_at: Optional[datetime]
    shipped_at: Optional[datetime]
    delivered_at: Optional[datetime]
    cancelled_at: Optional[datetime]


class OrderDetailResponse(OrderResponse):
    """Schema for detailed order response with items and addresses."""
    items: List[OrderItemResponse]
    shipping_address: OrderAddressResponse
    billing_address: OrderAddressResponse


class OrderListResponse(BaseModel):
    """Schema for paginated order list."""
    orders: List[OrderResponse]
    total: int
    skip: int
    limit: int