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


class SalesOrderItemCreate(BaseModel):
    product_id: Optional[int] = None
    product_sku: Optional[str] = None
    product_name: Optional[str] = None
    product_category: Optional[str] = None
    product_unit: Optional[str] = "件"
    quantity: int = Field(gt=0)
    unit_price: Decimal = Field(ge=0)
    remark: Optional[str] = None


class SalesOrderCreate(BaseModel):
    customer_id: int
    delivery_date: Optional[date] = None
    remark: Optional[str] = None
    items: List[SalesOrderItemCreate] = Field(min_length=1)


class SalesOrderResponse(BaseModel):
    id: int
    order_no: str
    customer_name: str
    order_date: datetime
    delivery_date: Optional[date]
    manufacturing_date: Optional[date]
    actual_delivery_date: Optional[datetime]
    actual_payment_date: Optional[datetime]
    status: str
    delivery_status: str  # "manufacturing" | "delivered" | "cancelled"
    payment_status: str   # "unpaid" | "paid"
    production_status: str
    production_no: Optional[str]
    planned_material_cost: Decimal
    actual_material_cost: Decimal
    total_amount: Decimal
    received_amount: Decimal
    remark: Optional[str]
    created_at: datetime

    class Config:
        from_attributes = True


class SalesOrderItemResponse(BaseModel):
    id: int
    product_id: int
    quantity: int
    delivered_quantity: int
    unit_price: Decimal
    amount: Decimal
    remark: Optional[str] = None


class SalesOrderDetailResponse(SalesOrderResponse):
    customer_id: int
    items: List[SalesOrderItemResponse]


class ProductionMaterialPlanItemResponse(BaseModel):
    material_id: int
    material_sku: str
    material_name: str
    required_quantity: Decimal
    available_quantity: Decimal
    shortage_quantity: Decimal
    unit_cost: Decimal
    required_cost: Decimal


class SalesOrderProductionPlanResponse(BaseModel):
    sales_order_id: int
    order_no: str
    customer_name: str
    production_no: str
    planned_material_cost: Decimal
    items: List[ProductionMaterialPlanItemResponse]


class SalesOrderIssueRequest(BaseModel):
    warehouse_id: int
    production_no: Optional[str] = None
    remark: Optional[str] = None


class SalesOrderIssueResponse(BaseModel):
    sales_order_id: int
    order_no: str
    production_no: str
    movement_count: int
    planned_material_cost: Decimal
    actual_material_cost: Decimal
    cost_deviation: Decimal
    cost_deviation_rate: Decimal
    production_status: str


class SalesOrderStatusUpdate(BaseModel):
    status: str