from datetime import datetime, timezone
from enum import Enum
from uuid import UUID, uuid4

from pydantic import BaseModel, ConfigDict, Field, HttpUrl


def now_utc() -> datetime:
    return datetime.now(timezone.utc)


class MonitorState(str, Enum):
    unknown = "unknown"
    up = "up"
    down = "down"


class MonitorCreate(BaseModel):
    name: str = Field(min_length=1, max_length=100)
    url: HttpUrl
    timeout_seconds: float | None = Field(None, gt=0, le=60)


class MonitorUpdate(BaseModel):
    name: str | None = Field(None, min_length=1, max_length=100)
    url: HttpUrl | None = None
    timeout_seconds: float | None = Field(None, gt=0, le=60)


class MonitorStatus(BaseModel):
    state: MonitorState = MonitorState.unknown
    checked_at: datetime | None = None
    http_status: int | None = None
    latency_ms: float | None = None
    error: str | None = None


class Monitor(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: UUID = Field(default_factory=uuid4)
    name: str
    url: HttpUrl
    timeout_seconds: float
    created_at: datetime = Field(default_factory=now_utc)
    updated_at: datetime = Field(default_factory=now_utc)
    status: MonitorStatus = Field(default_factory=MonitorStatus)


class CheckResult(MonitorStatus):
    pass


class ErrorBody(BaseModel):
    code: str
    message: str
    details: list[dict[str, object]] | None = None


class ErrorResponse(BaseModel):
    error: ErrorBody