"""Pydantic schemas for API request/response models."""
from datetime import datetime
from typing import Generic, TypeVar

from pydantic import BaseModel, EmailStr


# =============================================================================
# Auth Schemas
# =============================================================================

class UserCredentials(BaseModel):
    """Base model for user email/password."""
    email: EmailStr
    password: str


UserCreate = UserCredentials
UserLogin = UserCredentials


class UserResponse(BaseModel):
    """Response model for authenticated user info."""
    id: int
    email: str
    roles: list[str]
    permissions: list[str]


class TokenResponse(BaseModel):
    """Response model for token-based auth (unused but kept for API completeness)."""
    access_token: str
    token_type: str
    user: UserResponse


class RegisterWithInvite(BaseModel):
    """Request model for registration with invite."""
    email: EmailStr
    password: str
    invite_identifier: str


# =============================================================================
# Counter Schemas
# =============================================================================

class CounterValue(BaseModel):
    """Response model for counter value."""
    value: int


# =============================================================================
# Sum Schemas
# =============================================================================

class SumRequest(BaseModel):
    """Request model for sum calculation."""
    a: float
    b: float


class SumResponse(BaseModel):
    """Response model for sum calculation."""
    a: float
    b: float
    result: float


# =============================================================================
# Audit Schemas
# =============================================================================

class CounterRecordResponse(BaseModel):
    """Response model for a counter audit record."""
    id: int
    user_email: str
    value_before: int
    value_after: int
    created_at: datetime


class SumRecordResponse(BaseModel):
    """Response model for a sum audit record."""
    id: int
    user_email: str
    a: float
    b: float
    result: float
    created_at: datetime


# =============================================================================
# Pagination (Generic)
# =============================================================================

RecordT = TypeVar("RecordT", bound=BaseModel)


class PaginatedResponse(BaseModel, Generic[RecordT]):
    """Generic paginated response wrapper."""
    records: list[RecordT]
    total: int
    page: int
    per_page: int
    total_pages: int


PaginatedCounterRecords = PaginatedResponse[CounterRecordResponse]
PaginatedSumRecords = PaginatedResponse[SumRecordResponse]


# =============================================================================
# Profile Schemas
# =============================================================================

class ProfileResponse(BaseModel):
    """Response model for profile data."""
    contact_email: str | None
    telegram: str | None
    signal: str | None
    nostr_npub: str | None
    godfather_email: str | None = None


class ProfileUpdate(BaseModel):
    """Request model for updating profile."""
    contact_email: str | None = None
    telegram: str | None = None
    signal: str | None = None
    nostr_npub: str | None = None


# =============================================================================
# Invite Schemas
# =============================================================================

class InviteCheckResponse(BaseModel):
    """Response for invite check endpoint."""
    valid: bool
    status: str | None = None
    error: str | None = None


class InviteCreate(BaseModel):
    """Request model for creating an invite."""
    godfather_id: int


class InviteResponse(BaseModel):
    """Response model for invite data (admin view)."""
    id: int
    identifier: str
    godfather_id: int
    godfather_email: str
    status: str
    used_by_id: int | None
    used_by_email: str | None
    created_at: datetime
    spent_at: datetime | None
    revoked_at: datetime | None


class UserInviteResponse(BaseModel):
    """Response model for a user's invite (simpler than admin view)."""
    id: int
    identifier: str
    status: str
    used_by_email: str | None
    created_at: datetime
    spent_at: datetime | None


PaginatedInviteRecords = PaginatedResponse[InviteResponse]


# =============================================================================
# Admin Schemas
# =============================================================================

class AdminUserResponse(BaseModel):
    """Minimal user info for admin dropdowns."""
    id: int
    email: str