# models/schema/customer.py
"""
Pydantic schema for customer-related operations.
"""

from datetime import datetime
from decimal import Decimal
from typing import Optional, Dict, Any, List
from pydantic import BaseModel, EmailStr, Field, field_validator


# ============================================================================
# Customer Registration & Authentication
# ============================================================================

class CustomerRegister(BaseModel):
    """Schema for customer registration."""

    email: EmailStr = Field(..., description="Customer email address")
    password: str = Field(
        ...,
        min_length=8,
        description="Password (minimum 8 characters)"
    )
    first_name: str = Field(..., min_length=1, max_length=100)
    last_name: str = Field(..., min_length=1, max_length=100)
    phone: Optional[str] = Field(None, max_length=50)
    marketing_consent: bool = Field(default=False)

    @field_validator('email')
    @classmethod
    def email_lowercase(cls, v: str) -> str:
        """Convert email to lowercase."""
        return v.lower()

    @field_validator('password')
    @classmethod
    def password_strength(cls, v: str) -> str:
        """Validate password strength."""
        if len(v) < 8:
            raise ValueError("Password must be at least 8 characters")
        if not any(char.isdigit() for char in v):
            raise ValueError("Password must contain at least one digit")
        if not any(char.isalpha() for char in v):
            raise ValueError("Password must contain at least one letter")
        return v


class CustomerUpdate(BaseModel):
    """Schema for updating customer profile."""

    email: Optional[EmailStr] = None
    first_name: Optional[str] = Field(None, min_length=1, max_length=100)
    last_name: Optional[str] = Field(None, min_length=1, max_length=100)
    phone: Optional[str] = Field(None, max_length=50)
    marketing_consent: Optional[bool] = None

    @field_validator('email')
    @classmethod
    def email_lowercase(cls, v: Optional[str]) -> Optional[str]:
        """Convert email to lowercase."""
        return v.lower() if v else None


# ============================================================================
# Customer Response
# ============================================================================

class CustomerResponse(BaseModel):
    """Schema for customer response (excludes password)."""

    id: int
    vendor_id: int
    email: str
    first_name: Optional[str]
    last_name: Optional[str]
    phone: Optional[str]
    customer_number: str
    marketing_consent: bool
    last_order_date: Optional[datetime]
    total_orders: int
    total_spent: Decimal
    is_active: bool
    created_at: datetime
    updated_at: datetime

    model_config = {
        "from_attributes": True
    }

    @property
    def full_name(self) -> str:
        """Get customer full name."""
        if self.first_name and self.last_name:
            return f"{self.first_name} {self.last_name}"
        return self.email


class CustomerListResponse(BaseModel):
    """Schema for paginated customer list."""

    customers: List[CustomerResponse]
    total: int
    page: int
    per_page: int
    total_pages: int


# ============================================================================
# Customer Address
# ============================================================================

class CustomerAddressCreate(BaseModel):
    """Schema for creating customer address."""

    address_type: str = Field(..., pattern="^(billing|shipping)$")
    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)
    is_default: bool = Field(default=False)


class CustomerAddressUpdate(BaseModel):
    """Schema for updating customer address."""

    address_type: Optional[str] = Field(None, pattern="^(billing|shipping)$")
    first_name: Optional[str] = Field(None, min_length=1, max_length=100)
    last_name: Optional[str] = Field(None, min_length=1, max_length=100)
    company: Optional[str] = Field(None, max_length=200)
    address_line_1: Optional[str] = Field(None, min_length=1, max_length=255)
    address_line_2: Optional[str] = Field(None, max_length=255)
    city: Optional[str] = Field(None, min_length=1, max_length=100)
    postal_code: Optional[str] = Field(None, min_length=1, max_length=20)
    country: Optional[str] = Field(None, min_length=2, max_length=100)
    is_default: Optional[bool] = None


class CustomerAddressResponse(BaseModel):
    """Schema for customer address response."""

    id: int
    vendor_id: int
    customer_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
    is_default: bool
    created_at: datetime
    updated_at: datetime

    model_config = {
        "from_attributes": True
    }

# ============================================================================
# Customer Preferences
# ============================================================================

class CustomerPreferencesUpdate(BaseModel):
    """Schema for updating customer preferences."""

    marketing_consent: Optional[bool] = None
    language: Optional[str] = Field(None, max_length=10)
    currency: Optional[str] = Field(None, max_length=3)
    notification_preferences: Optional[Dict[str, bool]] = None