import importlib
import sys
from pathlib import Path

from fastapi.testclient import TestClient


ROOT = Path(__file__).resolve().parents[1]
if str(ROOT) not in sys.path:
    sys.path.insert(0, str(ROOT))


def load_app_module(monkeypatch, *, skip_model_load=True, ollama_model=None):
    if skip_model_load:
        monkeypatch.setenv("AI_SERVICE_SKIP_MODEL_LOAD", "1")
    else:
        monkeypatch.delenv("AI_SERVICE_SKIP_MODEL_LOAD", raising=False)
    monkeypatch.delenv("AI_SERVICE_EAGER_MODEL_LOAD", raising=False)
    if ollama_model is None:
        monkeypatch.delenv("OLLAMA_MODEL", raising=False)
    else:
        monkeypatch.setenv("OLLAMA_MODEL", ollama_model)
    if "app" in sys.modules:
        del sys.modules["app"]
    module = importlib.import_module("app")
    return importlib.reload(module)


def test_health_reports_runtime_without_ollama_and_without_forcing_model_load(monkeypatch):
    module = load_app_module(monkeypatch)
    client = TestClient(module.app)

    response = client.get("/health")

    assert response.status_code == 200
    payload = response.json()
    assert payload["ok"] is True
    assert payload["device"] == "cpu"
    assert payload["model_loaded"] is False
    assert payload["model_disabled"] is True
    assert payload["summarize_available"] is False
    assert "disabled" in payload["model_load_error"].lower()
    assert payload["ollama_configured"] is False
    assert payload["ollama_model"] is None
    assert payload["ollama_installed_models"] == []
    assert payload["ollama_loaded_models"] == []


def test_summarize_returns_503_with_explicit_reason_when_model_loading_is_disabled(monkeypatch):
    module = load_app_module(monkeypatch)
    client = TestClient(module.app)

    response = client.post("/summarize", json={"text": "Platform engineering role with APIs and Python experience."})

    assert response.status_code == 503
    payload = response.json()
    assert "disabled" in payload["detail"].lower()


def test_health_reports_ollama_unreachable_when_configured_but_not_available(monkeypatch):
    module = load_app_module(monkeypatch, ollama_model="qwen2.5:7b")

    def boom(path: str):
        raise OSError("connection refused")

    monkeypatch.setattr(module, "_ollama_json", boom)
    client = TestClient(module.app)

    response = client.get("/health")

    assert response.status_code == 200
    payload = response.json()
    assert payload["ollama_configured"] is True
    assert payload["ollama_reachable"] is False
    assert payload["ollama_model"] == "qwen2.5:7b"
    assert payload["ollama_model_available"] is False


def test_classify_block_returns_structured_json(monkeypatch):
    module = load_app_module(monkeypatch)

    def fake_generate_json(prompt: str):
        assert "Senior Platform Engineer" in prompt
        return {
            "section": "Work Experience",
            "confidence": 0.91,
            "reason": "job block",
            "title": "Senior Platform Engineer",
            "company": "Atlas Systems",
            "location": "Oslo",
            "start": "2019",
            "end": "Present",
            "bullets": ["Built event-driven APIs and migration tooling."],
            "summary": [],
            "skills": ["Python", "SQL"],
        }

    monkeypatch.setattr(module, "_ollama_generate_json", fake_generate_json)
    client = TestClient(module.app)

    response = client.post("/cv/classify-block", json={"block": "Senior Platform Engineer at Atlas Systems, Oslo, 2019 - Present. Built event-driven APIs and migration tooling."})

    assert response.status_code == 200
    payload = response.json()
    assert payload["section"] == "Work Experience"
    assert payload["title"] == "Senior Platform Engineer"
    assert payload["company"] == "Atlas Systems"
    assert payload["bullets"] == ["Built event-driven APIs and migration tooling."]
    assert payload["summary"] == []
    assert payload["skills"] == ["Python", "SQL"]


def test_classify_block_defaults_missing_section_to_other(monkeypatch):
    module = load_app_module(monkeypatch)
    monkeypatch.setattr(module, "_ollama_generate_json", lambda prompt: {"bullets": []})
    client = TestClient(module.app)

    response = client.post("/cv/classify-block", json={"block": "Miscellaneous profile text"})

    assert response.status_code == 200
    payload = response.json()
    assert payload["section"] == "Other"
    assert payload["bullets"] == []
    assert payload["summary"] == []
    assert payload["skills"] == []