# models/schema/company.py
"""
Pydantic schemas for Company model.

These schemas are used for API request/response validation and serialization.
"""

from datetime import datetime
from typing import Any

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


class CompanyBase(BaseModel):
    """Base schema for company with common fields."""

    name: str = Field(..., min_length=2, max_length=200, description="Company name")
    description: str | None = Field(None, description="Company description")
    contact_email: EmailStr = Field(..., description="Business contact email")
    contact_phone: str | None = Field(None, description="Business phone number")
    website: str | None = Field(None, description="Company website URL")
    business_address: str | None = Field(None, description="Physical business address")
    tax_number: str | None = Field(None, description="Tax/VAT registration number")

    @field_validator("contact_email")
    @classmethod
    def normalize_email(cls, v):
        """Normalize email to lowercase."""
        return v.lower() if v else v


class CompanyCreate(CompanyBase):
    """
    Schema for creating a new company.

    Requires owner_email to create the associated owner user account.
    """

    owner_email: EmailStr = Field(
        ..., description="Email for the company owner account"
    )

    @field_validator("owner_email")
    @classmethod
    def normalize_owner_email(cls, v):
        """Normalize owner email to lowercase."""
        return v.lower() if v else v

    model_config = ConfigDict(from_attributes=True)


class CompanyUpdate(BaseModel):
    """
    Schema for updating company information.

    All fields are optional to support partial updates.
    """

    name: str | None = Field(None, min_length=2, max_length=200)
    description: str | None = None
    contact_email: EmailStr | None = None
    contact_phone: str | None = None
    website: str | None = None
    business_address: str | None = None
    tax_number: str | None = None

    # Status (Admin only)
    is_active: bool | None = None
    is_verified: bool | None = None

    @field_validator("contact_email")
    @classmethod
    def normalize_email(cls, v):
        """Normalize email to lowercase."""
        return v.lower() if v else v

    model_config = ConfigDict(from_attributes=True)


class CompanyResponse(BaseModel):
    """Standard schema for company response data."""

    model_config = ConfigDict(from_attributes=True)

    id: int
    name: str
    description: str | None

    # Owner information
    owner_user_id: int

    # Contact Information
    contact_email: str
    contact_phone: str | None
    website: str | None

    # Business Information
    business_address: str | None
    tax_number: str | None

    # Status Flags
    is_active: bool
    is_verified: bool

    # Timestamps
    created_at: str
    updated_at: str


class CompanyDetailResponse(CompanyResponse):
    """
    Detailed company response including vendor count and owner details.

    Used for company detail pages and admin views.
    """

    # Owner details (from related User)
    owner_email: str | None = Field(None, description="Owner's email address")
    owner_username: str | None = Field(None, description="Owner's username")

    # Vendor statistics
    vendor_count: int = Field(0, description="Number of vendors under this company")
    active_vendor_count: int = Field(
        0, description="Number of active vendors under this company"
    )

    # Vendors list (optional, for detail view)
    vendors: list | None = Field(None, description="List of vendors under this company")


class CompanyListResponse(BaseModel):
    """Schema for paginated company list."""

    companies: list[CompanyResponse]
    total: int
    skip: int
    limit: int


class CompanyCreateResponse(BaseModel):
    """
    Response after creating a company with owner account.

    Includes temporary password for the owner (shown only once).
    """

    company: CompanyResponse
    owner_user_id: int
    owner_username: str
    owner_email: str
    temporary_password: str = Field(
        ..., description="Temporary password for owner (SHOWN ONLY ONCE)"
    )
    login_url: str | None = Field(None, description="URL for company owner to login")


class CompanySummary(BaseModel):
    """Lightweight company summary for dropdowns and quick references."""

    model_config = ConfigDict(from_attributes=True)

    id: int
    name: str
    is_active: bool
    is_verified: bool
    vendor_count: int = 0


class CompanyTransferOwnership(BaseModel):
    """
    Schema for transferring company ownership to another user.

    This is a critical operation that requires:
    - Confirmation flag
    - Reason for audit trail (optional)
    """

    new_owner_user_id: int = Field(
        ..., description="ID of the user who will become the new owner", gt=0
    )

    confirm_transfer: bool = Field(
        ..., description="Must be true to confirm ownership transfer"
    )

    transfer_reason: str | None = Field(
        None,
        max_length=500,
        description="Reason for ownership transfer (for audit logs)",
    )

    @field_validator("confirm_transfer")
    @classmethod
    def validate_confirmation(cls, v):
        """Ensure confirmation is explicitly true."""
        if not v:
            raise ValueError("Ownership transfer requires explicit confirmation")
        return v


class CompanyTransferOwnershipResponse(BaseModel):
    """Response after successful ownership transfer."""

    message: str
    company_id: int
    company_name: str

    old_owner: dict[str, Any] = Field(
        ..., description="Information about the previous owner"
    )
    new_owner: dict[str, Any] = Field(
        ..., description="Information about the new owner"
    )

    transferred_at: datetime
    transfer_reason: str | None