import pytest
from pydantic import ValidationError

from app.config import Settings, get_settings


REQUIRED_ENV = {
    "NEXTCLOUD_WEBDAV_URL": "https://nc/remote.php/dav/files/u",
    "NEXTCLOUD_USER": "u",
    "NEXTCLOUD_APP_PASSWORD": "pw",
    "OLLAMA_URL": "http://ollama:11434",
    "OLLAMA_EMBED_MODEL": "qwen3-embedding:0.6b",
    "QDRANT_URL": "http://qdrant:6333",
    "QDRANT_COLLECTION": "rag_test",
    "WEBHOOK_SECRET": "secret",
}


def _set_required(monkeypatch):
    for k, v in REQUIRED_ENV.items():
        monkeypatch.setenv(k, v)


def test_settings_loads_all_required_fields(monkeypatch):
    _set_required(monkeypatch)

    s = Settings()

    assert s.nextcloud_webdav_url == REQUIRED_ENV["NEXTCLOUD_WEBDAV_URL"]
    assert s.nextcloud_user == REQUIRED_ENV["NEXTCLOUD_USER"]
    assert s.nextcloud_app_password == REQUIRED_ENV["NEXTCLOUD_APP_PASSWORD"]
    assert s.ollama_url == REQUIRED_ENV["OLLAMA_URL"]
    assert s.ollama_embed_model == REQUIRED_ENV["OLLAMA_EMBED_MODEL"]
    assert s.qdrant_url == REQUIRED_ENV["QDRANT_URL"]
    assert s.qdrant_collection == REQUIRED_ENV["QDRANT_COLLECTION"]
    assert s.webhook_secret == REQUIRED_ENV["WEBHOOK_SECRET"]
    # defaults
    assert s.ingest_root == "Documents/THB/Studium"
    assert s.chunk_size_words == 500
    assert s.chunk_overlap_words == 50
    assert s.log_level == "INFO"


def test_settings_overrides_defaults(monkeypatch):
    _set_required(monkeypatch)
    monkeypatch.setenv("INGEST_ROOT", "Other/Path")
    monkeypatch.setenv("CHUNK_SIZE_WORDS", "300")
    monkeypatch.setenv("CHUNK_OVERLAP_WORDS", "30")

    s = Settings()

    assert s.ingest_root == "Other/Path"
    assert s.chunk_size_words == 300
    assert s.chunk_overlap_words == 30


def test_settings_missing_required_raises(monkeypatch):
    for k in REQUIRED_ENV:
        monkeypatch.delenv(k, raising=False)

    with pytest.raises(ValidationError):
        Settings()


def test_get_settings_caches_instance(monkeypatch):
    _set_required(monkeypatch)
    get_settings.cache_clear()

    first = get_settings()
    second = get_settings()

    assert isinstance(first, Settings)
    assert first is second

    get_settings.cache_clear()