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

from pydantic import BaseModel, ConfigDict, EmailStr, Field, field_validator
from models.api.product import ProductResponse

class ShopCreate(BaseModel):
    shop_code: str = Field(
        ...,
        min_length=3,
        max_length=50,
        description="Unique shop code (e.g., TECHSTORE)",
    )
    shop_name: str = Field(
        ..., min_length=1, max_length=200, description="Display name of the shop"
    )
    description: Optional[str] = Field(
        None, max_length=2000, description="Shop description"
    )
    contact_email: Optional[str] = None
    contact_phone: Optional[str] = None
    website: Optional[str] = None
    business_address: Optional[str] = None
    tax_number: Optional[str] = None

    @field_validator("shop_code")
    def validate_shop_code(cls, v):
        # Convert to uppercase and check format
        v = v.upper().strip()
        if not v.replace("_", "").replace("-", "").isalnum():
            raise ValueError(
                "Shop code must be alphanumeric (underscores and hyphens allowed)"
            )
        return v

    @field_validator("contact_email")
    def validate_contact_email(cls, v):
        if v and ("@" not in v or "." not in v):
            raise ValueError("Invalid email format")
        return v.lower() if v else v


class ShopUpdate(BaseModel):
    shop_name: Optional[str] = Field(None, min_length=1, max_length=200)
    description: Optional[str] = Field(None, max_length=2000)
    contact_email: Optional[str] = None
    contact_phone: Optional[str] = None
    website: Optional[str] = None
    business_address: Optional[str] = None
    tax_number: Optional[str] = None

    @field_validator("contact_email")
    def validate_contact_email(cls, v):
        if v and ("@" not in v or "." not in v):
            raise ValueError("Invalid email format")
        return v.lower() if v else v


class ShopResponse(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: int
    shop_code: str
    shop_name: str
    description: Optional[str]
    owner_id: int
    contact_email: Optional[str]
    contact_phone: Optional[str]
    website: Optional[str]
    business_address: Optional[str]
    tax_number: Optional[str]
    is_active: bool
    is_verified: bool
    created_at: datetime
    updated_at: datetime


class ShopListResponse(BaseModel):
    shops: List[ShopResponse]
    total: int
    skip: int
    limit: int

class ShopProductCreate(BaseModel):
    product_id: str = Field(..., description="Product ID to add to shop")
    shop_product_id: Optional[str] = Field(
        None, description="Shop's internal product ID"
    )
    shop_price: Optional[float] = Field(
        None, ge=0, description="Shop-specific price override"
    )
    shop_sale_price: Optional[float] = Field(
        None, ge=0, description="Shop-specific sale price"
    )
    shop_currency: Optional[str] = Field(None, description="Shop-specific currency")
    shop_availability: Optional[str] = Field(
        None, description="Shop-specific availability"
    )
    shop_condition: Optional[str] = Field(None, description="Shop-specific condition")
    is_featured: bool = Field(False, description="Featured product flag")
    min_quantity: int = Field(1, ge=1, description="Minimum order quantity")
    max_quantity: Optional[int] = Field(
        None, ge=1, description="Maximum order quantity"
    )


class ShopProductResponse(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: int
    shop_id: int
    product: ProductResponse
    shop_product_id: Optional[str]
    shop_price: Optional[float]
    shop_sale_price: Optional[float]
    shop_currency: Optional[str]
    shop_availability: Optional[str]
    shop_condition: Optional[str]
    is_featured: bool
    is_active: bool
    min_quantity: int
    max_quantity: Optional[int]
    created_at: datetime
    updated_at: datetime