"""Stateless REST endpoint for the guided interview.

Raw HTTP callers can't satisfy Gradio's hidden gr.State input on the UI
endpoints (/info advertises 2 params, the REST validator wants 3 — upstream
inconsistency, found in the June 6 live API check). interview_api carries the
state as an opaque JSON string instead, so a plain curl works end to end.
"""
from __future__ import annotations

import json

import pytest

import app as app_mod


def test_interview_api_starts_fresh_and_returns_state():
    result = app_mod.interview_api("Sam, 34")
    assert result["reply"].endswith("?")
    assert not result["done"]
    assert not result["early_exit"]
    state = json.loads(result["state"])
    assert state["user_turns"] == ["Sam, 34"]
    assert state["patient_age"] == 34


def test_interview_api_round_trip_continues_interview():
    first = app_mod.interview_api("Sam, 34")
    second = app_mod.interview_api("My crown feels high when I bite.", first["state"])
    state = json.loads(second["state"])
    assert state["user_turns"] == ["Sam, 34", "My crown feels high when I bite."]
    assert not second["done"]


def test_interview_api_runs_deterministic_sentinel():
    """The emergency interrupt must fire over the raw API exactly as in the UI."""
    result = app_mod.interview_api(
        "I have no pain but I cannot breathe properly and my throat is swelling"
    )
    assert result["early_exit"]
    assert result["done"]
    assert result["hard_findings"]
    assert "urgent" in result["reply"].lower() or "emergency" in result["reply"].lower()


def test_interview_api_rejects_malformed_state():
    with pytest.raises(ValueError):
        app_mod.interview_api("hello", "{not valid json")


def test_interview_api_rejects_state_with_wrong_fields():
    with pytest.raises(ValueError):
        app_mod.interview_api("hello", json.dumps({"phase": "demographics", "bogus": 1}))


def test_interview_api_rejects_unknown_phase():
    """Crafted phase must raise a clean ValueError, not 500 via KeyError in step()."""
    with pytest.raises(ValueError):
        app_mod.interview_api("hello", json.dumps({"phase": "hacked"}))


def test_interview_api_rejects_oversized_turn_history():
    """Replayed token may not exceed the interview's own turn cap (prompt inflation)."""
    bloated = json.dumps({"user_turns": ["tooth hurts"] * 1000})
    with pytest.raises(ValueError):
        app_mod.interview_api("hello", bloated)