"""Shared pytest fixtures for evaluation-framework tests."""

from __future__ import annotations

import json
from pathlib import Path

import pytest

from src.llm.client import LLMClient


class FakeLLMClient(LLMClient):
    """LLM client that returns a canned response per call.

    Tests pass `responses` as a list; each call pops the first item.
    """

    def __init__(self, responses: list[str]):
        self.responses = list(responses)
        self.calls: list[dict] = []

    def call(self, prompt_template: str, variables: dict, expert_knowledge: str = "") -> str:
        self.calls.append({
            "template": prompt_template,
            "variables": variables,
            "knowledge": expert_knowledge,
        })
        if not self.responses:
            raise RuntimeError("FakeLLMClient: no more responses queued")
        return self.responses.pop(0)


@pytest.fixture
def fake_llm():
    """Factory fixture: call `fake_llm([response1, response2, ...])` to create one."""
    return lambda responses: FakeLLMClient(responses)


@pytest.fixture
def articles_dir(tmp_path):
    """Empty tmp articles directory. Tests populate it with `write_article`."""
    d = tmp_path / "articles"
    d.mkdir()
    return d


@pytest.fixture
def write_article(articles_dir):
    """Write an article JSON file matching the scraper's output format.

    Usage in test:
        write_article(event_id="2025-0042-ITA", url="https://news/x",
                      title="Flood hits Milan", date="2025-06-01", text="...")
    """
    def _write(event_id, url, title, date, text, hash_suffix="aaaa1111"):
        filename = f"{event_id}_{hash_suffix}.json"
        (articles_dir / filename).write_text(
            json.dumps({"url": url, "title": title, "date": date, "text": text}),
            encoding="utf-8",
        )
        return articles_dir / filename
    return _write