"""
Pydantic schemas for request/response validation.

Provides typed data structures for API endpoints.
"""
from pydantic import BaseModel, EmailStr, Field
from typing import Optional, List
from datetime import datetime


# ===== Authentication Schemas =====

class LoginRequest(BaseModel):
    """Login request payload."""
    username: str = Field(..., min_length=3, max_length=64)
    password: str = Field(..., min_length=6, max_length=128)


class LoginResponse(BaseModel):
    """Login response payload."""
    access_token: str
    refresh_token: str
    token_type: str = "bearer"
    user: dict


class RefreshTokenRequest(BaseModel):
    """Refresh token request."""
    refresh_token: str


class TokenResponse(BaseModel):
    """Token response."""
    access_token: str
    token_type: str = "bearer"


# ===== User Schemas =====

class UserBase(BaseModel):
    """User base fields."""
    username: str
    email: Optional[str] = None
    country: Optional[str] = Field(None, max_length=2)
    real_name: Optional[str] = None


class UserCreate(UserBase):
    """User registration fields."""
    password: str = Field(..., min_length=8)
    
    class Config:
        json_schema_extra = {
            "example": {
                "username": "player123",
                "password": "securepassword123",
                "email": "player@example.com",
                "country": "US"
            }
        }


class UserUpdate(BaseModel):
    """User update fields."""
    email: Optional[str] = None
    country: Optional[str] = None
    real_name: Optional[str] = None
    new_password: Optional[str] = Field(None, min_length=8, max_length=128)


class UserResponse(BaseModel):
    """User response payload."""
    id: int
    username: str
    email: Optional[str]
    country: Optional[str]
    real_name: Optional[str]
    privlevel: str
    vip_status: int
    is_active: bool
    is_banned: bool
    ban_reason: Optional[str]
    creation_date: datetime
    last_login: Optional[datetime]
    
    class Config:
        from_attributes = True


# ===== Deck Schemas =====

class DeckCreate(BaseModel):
    """Deck creation request."""
    name: str = Field(..., min_length=1, max_length=255)
    content: str = Field(..., min_length=1)
    folder_id: Optional[int] = None
    format: str = Field("native", pattern="^(native|plain)$")


class DeckUpdate(BaseModel):
    """Deck update request."""
    name: Optional[str] = None
    content: Optional[str] = None
    folder_id: Optional[int] = None


class DeckResponse(BaseModel):
    """Deck response payload."""
    id: int
    name: str
    content: str
    format: str
    folder_id: Optional[int]
    owner_id: int
    creation_date: datetime
    
    class Config:
        from_attributes = True


class FolderCreate(BaseModel):
    """Folder creation request."""
    name: str = Field(..., min_length=1, max_length=255)
    parent_id: Optional[int] = None


class FolderResponse(BaseModel):
    """Folder response payload."""
    id: int
    name: str
    parent_id: Optional[int]
    owner_id: int
    creation_date: datetime
    
    class Config:
        from_attributes = True


# ===== Game Schemas =====

class GameCreate(BaseModel):
    """Game creation request."""
    room_id: int
    game_type: Optional[str] = None
    description: Optional[str] = None
    password: Optional[str] = None


class GameResponse(BaseModel):
    """Game response payload."""
    id: int
    room_id: int
    game_type: Optional[str]
    description: Optional[str]
    with_password: bool
    max_players: int
    player_count: int
    started: bool
    creation_date: datetime
    
    class Config:
        from_attributes = True


# ===== Room Schemas =====

class RoomResponse(BaseModel):
    """Room response payload."""
    id: int
    name: str
    description: Optional[str]
    is_password_protected: bool
    game_types: List[str] = []
    player_count: int = 0
    creation_date: datetime
    
    class Config:
        from_attributes = True


# ===== Ban Schemas =====

class BanCreate(BaseModel):
    """Ban creation request."""
    user_id: int
    reason: str = Field(..., min_length=1, max_length=1000)
    expiration_time: Optional[datetime] = None


class BanResponse(BaseModel):
    """Ban response payload."""
    id: int
    user_id: int
    reason: str
    moderators: Optional[str]
    expiration_time: Optional[datetime]
    active: bool
    creation_date: datetime
    
    class Config:
        from_attributes = True


# ===== Auth Error Responses =====

class ErrorResponse(BaseModel):
    """Standard error response."""
    detail: str


class ValidationErrorResponse(BaseModel):
    """Validation error response."""
    detail: List[dict]  # Pydantic validation errors


# ===== Pagination Schemas =====

class PaginationParams(BaseModel):
    """Common pagination parameters."""
    page: int = Field(1, ge=1)
    page_size: int = Field(50, ge=1, le=100)


class PaginatedResponse(BaseModel):
    """Generic paginated response."""
    items: List[dict]
    total: int
    page: int
    page_size: int
    total_pages: int