from datetime import datetime, timezone
from enum import StrEnum
from uuid import UUID

from pydantic import AnyHttpUrl, BaseModel, ConfigDict, Field


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


class HealthState(StrEnum):
    unknown = "unknown"
    up = "up"
    down = "down"


class MonitorCreate(BaseModel):
    name: str = Field(min_length=1, max_length=120)
    url: AnyHttpUrl


class MonitorUpdate(MonitorCreate):
    pass


class CurrentStatus(BaseModel):
    state: HealthState
    checked_at: datetime
    latency_ms: float = Field(ge=0)
    http_status: int | None = None
    error_code: str | None = None
    error_message: str | None = None


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

    id: UUID
    name: str
    url: AnyHttpUrl
    created_at: datetime
    updated_at: datetime
    revision: int
    current_status: CurrentStatus | None = None


class CheckResponse(BaseModel):
    monitor_id: UUID
    status: CurrentStatus
    applied: bool


class ErrorDetail(BaseModel):
    code: str
    message: str