# models/schema/vendor.py
import re
from datetime import datetime
from typing import Dict, List, Optional
from pydantic import BaseModel, ConfigDict, Field, field_validator


class VendorCreate(BaseModel):
    """Schema for creating a new vendor."""
    vendor_code: str = Field(..., description="Unique vendor identifier (e.g., TECHSTORE)")
    subdomain: str = Field(..., description="Unique subdomain for the vendor")
    name: str = Field(..., description="Display name of the vendor")
    description: Optional[str] = None

    # Owner information - REQUIRED for admin creation
    owner_email: str = Field(..., description="Email for the vendor owner account")

    # Contact information
    contact_phone: Optional[str] = None
    website: Optional[str] = None

    # Business information
    business_address: Optional[str] = None
    tax_number: Optional[str] = None

    # Letzshop CSV URLs (multi-language support)
    letzshop_csv_url_fr: Optional[str] = None
    letzshop_csv_url_en: Optional[str] = None
    letzshop_csv_url_de: Optional[str] = None

    # Theme configuration
    theme_config: Optional[Dict] = Field(default_factory=dict)

    @field_validator("owner_email")
    @classmethod
    def validate_owner_email(cls, v):
        if not v or "@" not in v or "." not in v:
            raise ValueError("Valid email address required for vendor owner")
        return v.lower()

    @field_validator("subdomain")
    @classmethod
    def validate_subdomain(cls, v):
        # Basic subdomain validation: lowercase alphanumeric with hyphens
        if v and not re.match(r'^[a-z0-9][a-z0-9-]*[a-z0-9]$', v):
            raise ValueError("Subdomain must contain only lowercase letters, numbers, and hyphens")
        return v.lower() if v else v

    @field_validator("vendor_code")
    @classmethod
    def validate_vendor_code(cls, v):
        # Ensure vendor code is uppercase for consistency
        return v.upper() if v else v


class VendorUpdate(BaseModel):
    """Schema for updating vendor information."""
    name: Optional[str] = None
    description: Optional[str] = None
    contact_email: Optional[str] = None
    contact_phone: Optional[str] = None
    website: Optional[str] = None
    business_address: Optional[str] = None
    tax_number: Optional[str] = None
    letzshop_csv_url_fr: Optional[str] = None
    letzshop_csv_url_en: Optional[str] = None
    letzshop_csv_url_de: Optional[str] = None
    theme_config: Optional[Dict] = None
    is_active: Optional[bool] = None

    @field_validator("contact_email")
    @classmethod
    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 VendorResponse(BaseModel):
    """Schema for vendor response data."""
    model_config = ConfigDict(from_attributes=True)

    id: int
    vendor_code: str
    subdomain: str
    name: str
    description: Optional[str]
    owner_user_id: int

    # Contact information
    contact_email: Optional[str]
    contact_phone: Optional[str]
    website: Optional[str]

    # Business information
    business_address: Optional[str]
    tax_number: Optional[str]

    # Letzshop URLs
    letzshop_csv_url_fr: Optional[str]
    letzshop_csv_url_en: Optional[str]
    letzshop_csv_url_de: Optional[str]

    # Theme configuration
    theme_config: Dict

    # Status flags
    is_active: bool
    is_verified: bool

    # Timestamps
    created_at: datetime
    updated_at: datetime


class VendorListResponse(BaseModel):
    """Schema for paginated vendor list."""
    vendors: List[VendorResponse]
    total: int
    skip: int
    limit: int


class VendorSummary(BaseModel):
    """Lightweight vendor summary for dropdowns and quick references."""
    model_config = ConfigDict(from_attributes=True)

    id: int
    vendor_code: str
    subdomain: str
    name: str
    is_active: bool


class VendorCreateResponse(VendorResponse):
    """Extended response for vendor creation with owner credentials."""
    owner_email: str
    owner_username: str
    temporary_password: str
    login_url: Optional[str] = None