# models/api_models.py - Updated with Marketplace Support
from pydantic import BaseModel, Field, field_validator, EmailStr
from typing import Optional, List
from datetime import datetime


# User Authentication Models
class UserRegister(BaseModel):
    email: EmailStr = Field(..., description="Valid email address")
    username: str = Field(..., min_length=3, max_length=50, description="Username (3-50 characters)")
    password: str = Field(..., min_length=6, description="Password (minimum 6 characters)")

    @field_validator('username')
    @classmethod
    def validate_username(cls, v):
        if not v.isalnum():
            raise ValueError('Username must contain only alphanumeric characters')
        return v.lower().strip()

    @field_validator('password')
    @classmethod
    def validate_password(cls, v):
        if len(v) < 6:
            raise ValueError('Password must be at least 6 characters long')
        return v


class UserLogin(BaseModel):
    username: str = Field(..., description="Username")
    password: str = Field(..., description="Password")

    @field_validator('username')
    @classmethod
    def validate_username(cls, v):
        return v.strip()


class UserResponse(BaseModel):
    id: int
    email: str
    username: str
    role: str
    is_active: bool
    last_login: Optional[datetime] = None
    created_at: datetime
    updated_at: datetime

    model_config = {"from_attributes": True}


class LoginResponse(BaseModel):
    access_token: str
    token_type: str = "bearer"
    expires_in: int
    user: UserResponse


# NEW: Shop models
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):
    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 Config:
        from_attributes = True


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


# Base Product Models with Marketplace Support
class ProductBase(BaseModel):
    product_id: Optional[str] = None
    title: Optional[str] = None
    description: Optional[str] = None
    link: Optional[str] = None
    image_link: Optional[str] = None
    availability: Optional[str] = None
    price: Optional[str] = None
    brand: Optional[str] = None
    gtin: Optional[str] = None
    mpn: Optional[str] = None
    condition: Optional[str] = None
    adult: Optional[str] = None
    multipack: Optional[int] = None
    is_bundle: Optional[str] = None
    age_group: Optional[str] = None
    color: Optional[str] = None
    gender: Optional[str] = None
    material: Optional[str] = None
    pattern: Optional[str] = None
    size: Optional[str] = None
    size_type: Optional[str] = None
    size_system: Optional[str] = None
    item_group_id: Optional[str] = None
    google_product_category: Optional[str] = None
    product_type: Optional[str] = None
    custom_label_0: Optional[str] = None
    custom_label_1: Optional[str] = None
    custom_label_2: Optional[str] = None
    custom_label_3: Optional[str] = None
    custom_label_4: Optional[str] = None
    additional_image_link: Optional[str] = None
    sale_price: Optional[str] = None
    unit_pricing_measure: Optional[str] = None
    unit_pricing_base_measure: Optional[str] = None
    identifier_exists: Optional[str] = None
    shipping: Optional[str] = None
    currency: Optional[str] = None
    # New marketplace fields
    marketplace: Optional[str] = None
    shop_name: Optional[str] = None


class ProductCreate(ProductBase):
    product_id: str = Field(..., min_length=1, description="Product ID is required")
    title: str = Field(..., min_length=1, description="Title is required")

    @field_validator('product_id', 'title')
    @classmethod
    def validate_required_fields(cls, v):
        if not v or not v.strip():
            raise ValueError('Field cannot be empty')
        return v.strip()


class ProductUpdate(ProductBase):
    pass


class ProductResponse(ProductBase):
    id: int
    created_at: datetime
    updated_at: datetime

    model_config = {"from_attributes": True}


# NEW: Shop Product models
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):
    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

    class Config:
        from_attributes = True


# Stock Models
class StockBase(BaseModel):
    gtin: str = Field(..., min_length=1, description="GTIN is required")
    location: str = Field(..., min_length=1, description="Location is required")


class StockCreate(StockBase):
    quantity: int = Field(ge=0, description="Quantity must be non-negative")


class StockAdd(StockBase):
    quantity: int = Field(gt=0, description="Quantity to add must be positive")


class StockUpdate(BaseModel):
    quantity: int = Field(ge=0, description="Quantity must be non-negative")


class StockResponse(BaseModel):
    id: int
    gtin: str
    location: str
    quantity: int
    created_at: datetime
    updated_at: datetime

    model_config = {"from_attributes": True}


class StockLocationResponse(BaseModel):
    location: str
    quantity: int


class StockSummaryResponse(BaseModel):
    gtin: str
    total_quantity: int
    locations: List[StockLocationResponse]
    product_title: Optional[str] = None


# Marketplace Import Models
class MarketplaceImportRequest(BaseModel):
    url: str = Field(..., description="URL to CSV file from marketplace")
    marketplace: str = Field(default="Letzshop", description="Name of the marketplace (e.g., Letzshop, Amazon, eBay)")
    shop_code: str = Field(..., description="Shop code to associate products with")
    batch_size: Optional[int] = Field(1000, gt=0, le=10000, description="Batch size for processing")

    @field_validator('url')
    @classmethod
    def validate_url(cls, v):
        if not v.startswith(('http://', 'https://')):
            raise ValueError('URL must start with http:// or https://')
        return v

    @field_validator('marketplace')
    @classmethod
    def validate_marketplace(cls, v):
        # You can add validation for supported marketplaces here
        supported_marketplaces = ['Letzshop', 'Amazon', 'eBay', 'Etsy', 'Shopify', 'Other']
        if v not in supported_marketplaces:
            # For now, allow any marketplace but log it
            pass
        return v.strip()

    @field_validator('shop_code')
    @classmethod
    def validate_shop_code(cls, v):
        return v.upper().strip()


class MarketplaceImportJobResponse(BaseModel):
    job_id: int
    status: str
    marketplace: str
    shop_id: int
    shop_code: Optional[str] = None  # Will be populated from shop relationship
    shop_name: str
    message: Optional[str] = None
    imported: Optional[int] = 0
    updated: Optional[int] = 0
    total_processed: Optional[int] = 0
    error_count: Optional[int] = 0
    error_message: Optional[str] = None
    created_at: Optional[datetime] = None
    started_at: Optional[datetime] = None
    completed_at: Optional[datetime] = None


# Response Models
class ProductListResponse(BaseModel):
    products: List[ProductResponse]
    total: int
    skip: int
    limit: int


class ProductDetailResponse(BaseModel):
    product: ProductResponse
    stock_info: Optional[StockSummaryResponse] = None


class StatsResponse(BaseModel):
    total_products: int
    unique_brands: int
    unique_categories: int
    unique_marketplaces: int = 0
    unique_shops: int = 0
    total_stock_entries: int = 0
    total_inventory_quantity: int = 0


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