from dataclasses import dataclass
from time import perf_counter

import httpx


@dataclass(frozen=True)
class WebsiteCheckConfig:
    url: str
    expected_status: int = 200
    expected_text: str | None = None
    unexpected_text: str | None = None
    timeout_seconds: float = 10.0


@dataclass(frozen=True)
class WebsiteCheckResult:
    status: str
    response_time_ms: int | None
    message: str


async def run_website_check(config: WebsiteCheckConfig) -> WebsiteCheckResult:
    started = perf_counter()
    try:
        async with httpx.AsyncClient(follow_redirects=True, timeout=config.timeout_seconds) as client:
            response = await client.get(config.url)
    except httpx.HTTPError as exc:
        return WebsiteCheckResult(status="down", response_time_ms=None, message=str(exc))

    response_time_ms = int((perf_counter() - started) * 1000)
    if response.status_code != config.expected_status:
        return WebsiteCheckResult(
            status="down",
            response_time_ms=response_time_ms,
            message=f"Expected HTTP {config.expected_status}, got {response.status_code}",
        )
    if config.expected_text and config.expected_text not in response.text:
        return WebsiteCheckResult(
            status="down",
            response_time_ms=response_time_ms,
            message="Expected text was not present",
        )
    if config.unexpected_text and config.unexpected_text in response.text:
        return WebsiteCheckResult(
            status="down",
            response_time_ms=response_time_ms,
            message="Unexpected text was present",
        )
    return WebsiteCheckResult(status="up", response_time_ms=response_time_ms, message="Website check passed")