"""
Pydantic models for OpenAI API compatibility
"""
from typing import List, Optional, Dict, Any, Union, Literal
from pydantic import BaseModel, Field

class ChatMessage(BaseModel):
    role: Literal["system", "user", "assistant"]
    content: str

class ChatCompletionRequest(BaseModel):
    model: str
    messages: List[ChatMessage]
    temperature: Optional[float] = 1.0
    top_p: Optional[float] = 1.0
    n: Optional[int] = 1
    stream: Optional[bool] = False
    stop: Optional[Union[str, List[str]]] = None
    max_tokens: Optional[int] = None
    presence_penalty: Optional[float] = 0.0
    frequency_penalty: Optional[float] = 0.0
    logit_bias: Optional[Dict[str, float]] = None
    user: Optional[str] = None

class ChatCompletionChoice(BaseModel):
    index: int
    message: ChatMessage
    finish_reason: Optional[str] = None

class ChatCompletionUsage(BaseModel):
    prompt_tokens: int
    completion_tokens: int
    total_tokens: int

class ChatCompletionResponse(BaseModel):
    id: str
    object: str = "chat.completion"
    created: int
    model: str
    choices: List[ChatCompletionChoice]
    usage: Optional[ChatCompletionUsage] = None

class ChatCompletionStreamChoice(BaseModel):
    index: int
    delta: Dict[str, Any]
    finish_reason: Optional[str] = None

class ChatCompletionStreamResponse(BaseModel):
    id: str
    object: str = "chat.completion.chunk"
    created: int
    model: str
    choices: List[ChatCompletionStreamChoice]

class ModelInfo(BaseModel):
    id: str
    object: str = "model"
    owned_by: str
    permission: List[Any] = []

class ModelsResponse(BaseModel):
    object: str = "list"
    data: List[ModelInfo]

class ErrorResponse(BaseModel):
    error: Dict[str, Any]