from pydantic import BaseModel
from typing import Optional, List
from datetime import datetime
from enum import Enum


class OrderStatus(str, Enum):
    DRAFT = "draft"
    CONFIRMED = "confirmed"
    PARTIALLY_RECEIVED = "partially_received"
    RECEIVED = "received"
    CANCELLED = "cancelled"


class OrderType(str, Enum):
    SALES = "sales"
    PURCHASE = "purchase"


class Customer(BaseModel):
    id: int
    code: str
    name: str
    email: str
    phone: str
    address: str
    city: str
    country: str
    credit_limit: float
    balance: float

    class Config:
        json_schema_extra = {
            "example": {
                "id": 1,
                "code": "CUST001",
                "name": "Acme Corp",
                "email": "info@acme.com",
                "phone": "+39 02 1234567",
                "address": "Via Roma 10",
                "city": "Milano",
                "country": "IT",
                "credit_limit": 50000,
                "balance": 15000
            }
        }


class Supplier(BaseModel):
    id: int
    code: str
    name: str
    email: str
    phone: str
    address: str
    city: str
    country: str
    payment_terms_days: int
    balance: float

    class Config:
        json_schema_extra = {
            "example": {
                "id": 1,
                "code": "SUPP001",
                "name": "Global Components Ltd",
                "email": "sales@globalcomp.com",
                "phone": "+44 20 7946 0958",
                "address": "123 Oxford Street",
                "city": "London",
                "country": "UK",
                "payment_terms_days": 30,
                "balance": 5000
            }
        }


class Product(BaseModel):
    id: int
    code: str
    description: str
    category: str
    unit_price: float
    quantity_in_stock: int
    reorder_level: int
    supplier_id: Optional[int] = None

    class Config:
        json_schema_extra = {
            "example": {
                "id": 1,
                "code": "PROD001",
                "description": "Industrial Widget A",
                "category": "Electronics",
                "unit_price": 125.50,
                "quantity_in_stock": 250,
                "reorder_level": 50,
                "supplier_id": 1
            }
        }


class OrderLine(BaseModel):
    id: int
    product_id: int
    product_code: str
    product_description: str
    quantity: float
    unit_price: float
    total_amount: float

    class Config:
        json_schema_extra = {
            "example": {
                "id": 1,
                "product_id": 1,
                "product_code": "PROD001",
                "product_description": "Industrial Widget A",
                "quantity": 10,
                "unit_price": 125.50,
                "total_amount": 1255.00
            }
        }


class SalesOrder(BaseModel):
    id: int
    order_number: str
    order_date: datetime
    customer_id: int
    customer_name: str
    status: OrderStatus
    lines: List[OrderLine]
    total_amount: float
    delivery_date: Optional[datetime] = None

    class Config:
        json_schema_extra = {
            "example": {
                "id": 1,
                "order_number": "SO-2024-001",
                "order_date": "2024-01-15T10:30:00",
                "customer_id": 1,
                "customer_name": "Acme Corp",
                "status": "confirmed",
                "lines": [],
                "total_amount": 2500.00,
                "delivery_date": "2024-02-15T00:00:00"
            }
        }


class PurchaseOrder(BaseModel):
    id: int
    order_number: str
    order_date: datetime
    supplier_id: int
    supplier_name: str
    status: OrderStatus
    lines: List[OrderLine]
    total_amount: float
    expected_delivery_date: Optional[datetime] = None

    class Config:
        json_schema_extra = {
            "example": {
                "id": 1,
                "order_number": "PO-2024-001",
                "order_date": "2024-01-10T14:00:00",
                "supplier_id": 1,
                "supplier_name": "Global Components Ltd",
                "status": "confirmed",
                "lines": [],
                "total_amount": 5000.00,
                "expected_delivery_date": "2024-02-10T00:00:00"
            }
        }


class DashboardWidget(BaseModel):
    title: str
    subtitle: Optional[str] = None
    style: str  # "stats", "chart", "grid"
    size: str = "small"  # "small", "medium", "large"
    icon: Optional[str] = None
    color: Optional[str] = None
    value: Optional[str] = None
    format: Optional[str] = None  # "money", "number", "date"
    data: Optional[dict] = None


class Dashboard(BaseModel):
    widgets: List[List[DashboardWidget]]