from datetime import datetime

import dateutil.parser
import httpx
from pydantic import BaseModel, Field


class Story(BaseModel):
    """Model representing a Hacker News story."""

    id: str
    title: str = Field(description="Title of the story.")
    url: str | None = Field(description="URL of the story.")

    created_at: datetime


class HackerNewsClient:
    def __init__(self, client: httpx.Client | None = None):
        base_url = "https://hn.algolia.com/api/v1"
        if client:
            client.base_url = base_url
            self._client = client
        else:
            self._client = httpx.Client(base_url=base_url)

    def get_top_stories(self, limit: int = 10) -> list[Story]:
        resp = self._client.get(
            "search",
            params={"tags": "front_page", "hitsPerPage": limit, "page": 0},
        )
        resp.raise_for_status()
        return [
            Story(
                id=hit["objectID"],
                title=hit["title"],
                url=hit.get("url"),
                created_at=dateutil.parser.isoparse(hit["created_at"]),
            )
            for hit in resp.json().get("hits", [])
        ]

    def get_item(self, item_id):
        resp = self._client.get(f"items/{item_id}")
        resp.raise_for_status()
        return resp.json()