"""Tests for :mod:`ix.config` — the pydantic-settings ``AppConfig``.

Guardrails we care about:

1. Every env var in spec §9 round-trips with the right type.
2. Defaults match the spec exactly when no env is set.
3. Unknown IX_ vars are ignored (``extra="ignore"``) so a typo doesn't crash
   the container at startup.
4. ``get_config()`` is cached — same instance per process — and
   ``get_config.cache_clear()`` rebuilds from the current environment (used by
   every test here to keep them independent of process state).
"""

from __future__ import annotations

import pytest

from ix.config import AppConfig, get_config


@pytest.fixture(autouse=True)
def _reset_config_cache() -> None:
    """Flush the LRU cache around every test.

    Without this, tests that set env vars would see stale data from earlier
    runs because ``get_config()`` caches the first materialised instance.
    """

    get_config.cache_clear()


def _clear_ix_env(monkeypatch: pytest.MonkeyPatch) -> None:
    """Scrub every IX_* var so defaults surface predictably.

    Tests that exercise env-based overrides still call ``monkeypatch.setenv``
    after this to dial in specific values; tests for defaults rely on this
    scrubbing so a developer's local ``.env`` can't contaminate the assertion.
    """

    import os

    for key in list(os.environ):
        if key.startswith("IX_"):
            monkeypatch.delenv(key, raising=False)


def test_defaults_match_spec(monkeypatch: pytest.MonkeyPatch) -> None:
    _clear_ix_env(monkeypatch)
    # Don't let pydantic-settings pick up the repo's .env.example.
    cfg = AppConfig(_env_file=None)  # type: ignore[call-arg]

    assert cfg.postgres_url == (
        "postgresql+asyncpg://infoxtractor:<password>"
        "@host.docker.internal:5431/infoxtractor"
    )
    assert cfg.ollama_url == "http://host.docker.internal:11434"
    assert cfg.default_model == "qwen3:14b"
    assert cfg.ocr_engine == "surya"
    assert cfg.tmp_dir == "/tmp/ix"
    assert cfg.pipeline_worker_concurrency == 1
    assert cfg.pipeline_request_timeout_seconds == 2700
    assert cfg.genai_call_timeout_seconds == 1500
    assert cfg.file_max_bytes == 52428800
    assert cfg.file_connect_timeout_seconds == 10
    assert cfg.file_read_timeout_seconds == 30
    assert cfg.render_max_pixels_per_page == 75000000
    assert cfg.log_level == "INFO"
    assert cfg.callback_timeout_seconds == 10


def test_env_overrides(monkeypatch: pytest.MonkeyPatch) -> None:
    _clear_ix_env(monkeypatch)
    monkeypatch.setenv("IX_POSTGRES_URL", "postgresql+asyncpg://u:p@db:5432/x")
    monkeypatch.setenv("IX_OLLAMA_URL", "http://llm:11434")
    monkeypatch.setenv("IX_DEFAULT_MODEL", "llama3:8b")
    monkeypatch.setenv("IX_PIPELINE_WORKER_CONCURRENCY", "4")
    monkeypatch.setenv("IX_GENAI_CALL_TIMEOUT_SECONDS", "60")
    monkeypatch.setenv("IX_LOG_LEVEL", "DEBUG")
    monkeypatch.setenv("IX_CALLBACK_TIMEOUT_SECONDS", "30")

    cfg = AppConfig(_env_file=None)  # type: ignore[call-arg]

    assert cfg.postgres_url == "postgresql+asyncpg://u:p@db:5432/x"
    assert cfg.ollama_url == "http://llm:11434"
    assert cfg.default_model == "llama3:8b"
    assert cfg.pipeline_worker_concurrency == 4
    assert cfg.genai_call_timeout_seconds == 60
    assert cfg.log_level == "DEBUG"
    assert cfg.callback_timeout_seconds == 30


def test_get_config_is_cached(monkeypatch: pytest.MonkeyPatch) -> None:
    _clear_ix_env(monkeypatch)
    monkeypatch.setenv("IX_POSTGRES_URL", "postgresql+asyncpg://a:b@c:5432/d1")
    first = get_config()
    # Later mutation must NOT be seen until cache_clear — this is a feature,
    # not a bug: config is process-level state, not per-call.
    monkeypatch.setenv("IX_POSTGRES_URL", "postgresql+asyncpg://a:b@c:5432/d2")
    second = get_config()
    assert first is second
    assert second.postgres_url.endswith("/d1")

    get_config.cache_clear()
    third = get_config()
    assert third is not first
    assert third.postgres_url.endswith("/d2")


def test_extra_env_keys_are_ignored(monkeypatch: pytest.MonkeyPatch) -> None:
    """A typo'd IX_FOOBAR should not raise ValidationError at startup."""
    _clear_ix_env(monkeypatch)
    monkeypatch.setenv("IX_FOOBAR", "whatever")
    # Should not raise.
    cfg = AppConfig(_env_file=None)  # type: ignore[call-arg]
    assert cfg.ollama_url.startswith("http://")


def test_engine_uses_config_url(monkeypatch: pytest.MonkeyPatch) -> None:
    """``ix.store.engine`` reads the URL through ``AppConfig``.

    Task 3.2 refactors engine.py to go through ``get_config()`` instead of
    reading ``os.environ`` directly. We can't actually construct an async
    engine in a unit test (would need the DB), so we verify the resolution
    function exists and returns the configured URL.
    """
    _clear_ix_env(monkeypatch)
    monkeypatch.setenv("IX_POSTGRES_URL", "postgresql+asyncpg://a:b@c:5432/d")

    from ix.store.engine import _resolve_url

    assert _resolve_url() == "postgresql+asyncpg://a:b@c:5432/d"