import re
from decimal import Decimal
from datetime import datetime
from typing import List, Optional

from pydantic import BaseModel, ConfigDict, EmailStr, Field, field_validator


class StatsResponse(BaseModel):
    total_products: int
    unique_brands: int
    unique_categories: int
    unique_marketplaces: int = 0
    unique_vendors: int = 0
    total_inventory_entries: int = 0
    total_inventory_quantity: int = 0


class MarketplaceStatsResponse(BaseModel):
    marketplace: str
    total_products: int
    unique_vendors: int
    unique_brands: int

# ============================================================================
# Customer Statistics
# ============================================================================

class CustomerStatsResponse(BaseModel):
    """Schema for customer statistics."""

    customer_id: int
    total_orders: int
    total_spent: Decimal
    average_order_value: Decimal
    last_order_date: Optional[datetime]
    first_order_date: Optional[datetime]
    lifetime_value: Decimal


# ============================================================================
# Order Statistics
# ============================================================================

class OrderStatsResponse(BaseModel):
    """Schema for order statistics."""
    total_orders: int
    pending_orders: int
    processing_orders: int
    shipped_orders: int
    delivered_orders: int
    cancelled_orders: int
    total_revenue: Decimal
    average_order_value: Decimal

# ============================================================================
# Vendor Statistics
# ============================================================================

class VendorStatsResponse(BaseModel):
    """Vendor statistics response schema."""
    total: int = Field(..., description="Total number of vendors")
    verified: int = Field(..., description="Number of verified vendors")
    pending: int = Field(..., description="Number of pending verification vendors")
    inactive: int = Field(..., description="Number of inactive vendors")