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

from pydantic import BaseModel, ConfigDict, Field, HttpUrl


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


class State(StrEnum):
    UNKNOWN = "unknown"
    UP = "up"
    DOWN = "down"
    ERROR = "error"


class MonitorInput(BaseModel):
    model_config = ConfigDict(str_strip_whitespace=True)

    name: str = Field(min_length=1, max_length=100)
    url: HttpUrl


class CurrentStatus(BaseModel):
    state: State = State.UNKNOWN
    checked_at: datetime | None = None
    latency_ms: float | None = Field(default=None, ge=0)
    status_code: int | None = Field(default=None, ge=100, le=599)
    error_code: str | None = None


class Monitor(BaseModel):
    id: UUID
    name: str
    url: HttpUrl
    created_at: datetime
    updated_at: datetime
    current_status: CurrentStatus


class CheckResult(CurrentStatus):
    monitor_id: UUID


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


class ErrorEnvelope(BaseModel):
    error: ErrorBody