from datetime import datetime
from enum import Enum
from typing import Optional

from pydantic import BaseModel, Field


class JobStatus(str, Enum):
    PENDING = "pending"
    QUEUED = "queued"
    PREPROCESSING = "preprocessing"
    TRAINING = "training"
    COMPLETED = "completed"
    EVALUATING = "evaluating"
    EVALUATION_DONE = "evaluation_done"
    FAILED = "failed"
    CANCELLED = "cancelled"


class ModelType(str, Enum):
    TEXT = "text"
    VISION = "vision"
    MULTIMODAL = "multimodal"


class PeftMethod(str, Enum):
    LORA = "lora"
    QLORA = "qlora"
    IA3 = "ia3"
    ADALORA = "adalora"
    PREFIX_TUNING = "prefix_tuning"


class PaginationParams(BaseModel):
    page: int = Field(default=1, ge=1)
    page_size: int = Field(default=20, ge=1, le=100)


class PaginatedResponse[T](BaseModel):
    items: list[T]
    total: int
    page: int
    page_size: int


class ErrorResponse(BaseModel):
    detail: str
    code: str = "error"