"""Eval harness contract. Does not call a live provider."""
from __future__ import annotations

import os
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(ROOT))
os.environ.setdefault("KANSHO_FAKE_DETECT", "1")

from entity_detect_eval import CASES, run_fake, score_spans


def expect(ok: bool, message: str) -> None:
    if not ok:
        raise SystemExit(f"FAIL: {message}")
    print(f"OK  {message}")


def main() -> None:
    payload = run_fake()
    expect(payload["mode"] == "fake", "eval default is fake")
    expect(payload["live_quality"] == "unconfirmed", "live quality stays unconfirmed")
    expect(payload["detect_model_unconfirmed"] == "openai/gpt-4.1-nano", "configured detect model stays unconfirmed")
    expect(len(payload["cases"]) >= 8, "synthetic span cases exist")
    person = next(item for item in CASES if item["id"] == "no_sentence_span")
    metrics = score_spans(
        [{"start": 9, "end": 13, "text": "Anna", "entity_type": "PERSON"}],
        person["expected"],
    )
    expect(metrics["expected_found"] == 1, "exact expected span is counted")
    expect(metrics["precision"] == 1.0 and metrics["recall"] == 1.0, "exact span match is precision 1")
    wrong = score_spans(
        [{"start": 0, "end": 28, "text": "Ich traf Anna am Nachmittag.", "entity_type": "PERSON"}],
        person["expected"],
    )
    expect(wrong["unexpected"] == 1, "sentence-sized span is unexpected")
    food = next(item for item in payload["cases"] if item["id"] == "same_word_two_roles")
    expect(food["entities"]["metrics"]["expected_found"] == 1, "fake contract finds only the identity sushi")
    print("All detect eval harness tests passed.")


if __name__ == "__main__":
    main()