"""Risoluzione modelli: ordine **cache HF → filesystem (MODELS_DIR) → online**.

Il vecchio gate `ENABLE_HF_CACHE` è stato rimosso. La regola ora è:
- in cache HF → si usa la cache (ritorna il repo-id, offline-safe);
- altrimenti in `MODELS_DIR/<repo>` → si usa la folder locale;
- altrimenti, se è permessa la rete (`HF_HUB_OFFLINE` non attivo) → repo-id (download);
- altrimenti il modello NON è disponibile → `ModelUnavailable` (nessun crash a monte:
  i layer lo intercettano e si auto-inibiscono).
"""

from __future__ import annotations

from pathlib import Path

import pytest

import config.runtime.models as cfg_models

# Riferimento alla funzione REALE (l'autouse fixture sotto la sostituisce):
# serve al test che verifica la lettura di RUNTIME_MODE.
_REAL_LOCAL_ONLY = cfg_models._local_only


@pytest.fixture(autouse=True)
def _default_non_local(monkeypatch):
    """Default dei test: NON local mode (l'ambiente può avere RUNTIME_MODE=local
    via .env caricato da python-dotenv). I test del local mode lo riattivano."""
    monkeypatch.setattr(cfg_models, "_local_only", lambda: False)


# --- local_path: cache → filesystem → online → ModelUnavailable --------------

def test_local_path_prefers_hf_cache(monkeypatch, tmp_path):
    # In cache → ritorna il repo-id (i loader caricano dalla cache, anche offline).
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_in_hf_cache", lambda repo: True)
    repo = "DeepMount00/universal_ner_ita"
    # anche se esiste la folder locale, la cache ha precedenza
    (tmp_path / repo).mkdir(parents=True)
    assert cfg_models.local_path(repo) == repo


def test_local_path_falls_back_to_filesystem(monkeypatch, tmp_path):
    # Non in cache, ma presente in MODELS_DIR → path locale.
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_in_hf_cache", lambda repo: False)
    repo = "DeepMount00/Italian_NER_XXL_v2"
    (tmp_path / repo).mkdir(parents=True)
    assert cfg_models.local_path(repo) == str(tmp_path / repo)


def test_local_path_uses_repo_id_when_online(monkeypatch, tmp_path):
    # Né cache né folder, ma rete permessa → repo-id (download dall'Hub).
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_in_hf_cache", lambda repo: False)
    monkeypatch.setattr(cfg_models, "_online", lambda: True)
    repo = "DeepMount00/universal_ner_ita"
    assert cfg_models.local_path(repo) == repo


def test_local_path_raises_when_absent_and_offline(monkeypatch, tmp_path):
    # Né cache né folder, niente rete → ModelUnavailable (non FileNotFoundError).
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_in_hf_cache", lambda repo: False)
    monkeypatch.setattr(cfg_models, "_online", lambda: False)
    with pytest.raises(cfg_models.ModelUnavailable):
        cfg_models.local_path("DeepMount00/universal_ner_ita")


# --- model_available: cache OR filesystem OR online --------------------------

def test_model_available_true_when_cached(monkeypatch, tmp_path):
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_in_hf_cache", lambda repo: True)
    monkeypatch.setattr(cfg_models, "_online", lambda: False)
    assert cfg_models.model_available("x/y") is True


def test_model_available_true_when_in_filesystem(monkeypatch, tmp_path):
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_in_hf_cache", lambda repo: False)
    monkeypatch.setattr(cfg_models, "_online", lambda: False)
    (tmp_path / "x" / "y").mkdir(parents=True)
    assert cfg_models.model_available("x/y") is True


def test_model_available_true_when_online(monkeypatch, tmp_path):
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_in_hf_cache", lambda repo: False)
    monkeypatch.setattr(cfg_models, "_online", lambda: True)
    assert cfg_models.model_available("x/y") is True


def test_model_available_false_when_absent_and_offline(monkeypatch, tmp_path):
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_in_hf_cache", lambda repo: False)
    monkeypatch.setattr(cfg_models, "_online", lambda: False)
    assert cfg_models.model_available("x/y") is False


# --- find_gguf: cache → filesystem → online → ModelUnavailable ---------------

def test_find_gguf_prefers_filesystem(monkeypatch, tmp_path):
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_cache_gguf", lambda repo, pat: None)
    repo = "unsloth/gemma-4-E2B-it-GGUF"
    base = tmp_path / repo
    base.mkdir(parents=True)
    (base / "gemma-4-E2B-it-Q4_K_M.gguf").write_bytes(b"x")
    (base / "gemma-4-E2B-it-Q8_0.gguf").write_bytes(b"x")
    assert Path(cfg_models.find_gguf(repo, "*Q4_K_M.gguf")) == (
        base / "gemma-4-E2B-it-Q4_K_M.gguf"
    )


def test_find_gguf_prefers_cache_over_filesystem(monkeypatch, tmp_path):
    # In cache → usata prima della folder (coerente con local_path).
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_cache_gguf", lambda repo, pat: "/cache/x.gguf")
    repo = "unsloth/gemma-4-E2B-it-GGUF"
    base = tmp_path / repo
    base.mkdir(parents=True)
    (base / "gemma-4-E2B-it-Q4_K_M.gguf").write_bytes(b"x")
    assert cfg_models.find_gguf(repo, "*Q4_K_M.gguf") == "/cache/x.gguf"


def test_find_gguf_downloads_when_online(monkeypatch, tmp_path):
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_cache_gguf", lambda repo, pat: None)
    monkeypatch.setattr(cfg_models, "_online", lambda: True)
    monkeypatch.setattr(cfg_models, "_download_gguf", lambda repo, pat: "/dl/x.gguf")
    assert cfg_models.find_gguf("unsloth/gemma-4-E2B-it-GGUF", "*Q4_K_M.gguf") == (
        "/dl/x.gguf"
    )


def test_find_gguf_raises_when_absent_and_offline(monkeypatch, tmp_path):
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_cache_gguf", lambda repo, pat: None)
    monkeypatch.setattr(cfg_models, "_online", lambda: False)
    with pytest.raises(cfg_models.ModelUnavailable):
        cfg_models.find_gguf("unsloth/gemma-4-E2B-it-GGUF", "*Q4_K_M.gguf")


# --- RUNTIME_MODE=local: SOLO filesystem (niente cache HF, niente rete) -------

def test_local_only_reads_runtime_mode(monkeypatch):
    monkeypatch.setenv("RUNTIME_MODE", "local")
    assert _REAL_LOCAL_ONLY() is True
    monkeypatch.setenv("RUNTIME_MODE", "LOCAL")  # case-insensitive
    assert _REAL_LOCAL_ONLY() is True
    monkeypatch.setenv("RUNTIME_MODE", "dedicated")
    assert _REAL_LOCAL_ONLY() is False
    monkeypatch.delenv("RUNTIME_MODE", raising=False)
    assert _REAL_LOCAL_ONLY() is False


def test_local_mode_uses_only_filesystem(monkeypatch, tmp_path):
    # In local mode, cache "piena" e rete permessa NON contano: vale solo la folder.
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_local_only", lambda: True)
    monkeypatch.setattr(cfg_models, "_in_hf_cache", lambda repo: True)
    monkeypatch.setattr(cfg_models, "_online", lambda: True)
    repo = "DeepMount00/universal_ner_ita"
    (tmp_path / repo).mkdir(parents=True)
    assert cfg_models.local_path(repo) == str(tmp_path / repo)


def test_local_mode_ignores_cache_and_network(monkeypatch, tmp_path):
    # Modello in cache e online, ma NON in MODELS_DIR → indisponibile in local mode.
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_local_only", lambda: True)
    monkeypatch.setattr(cfg_models, "_in_hf_cache", lambda repo: True)
    monkeypatch.setattr(cfg_models, "_online", lambda: True)
    with pytest.raises(cfg_models.ModelUnavailable):
        cfg_models.local_path("DeepMount00/universal_ner_ita")


def test_model_available_local_mode_filesystem_only(monkeypatch, tmp_path):
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_local_only", lambda: True)
    monkeypatch.setattr(cfg_models, "_in_hf_cache", lambda repo: True)
    monkeypatch.setattr(cfg_models, "_online", lambda: True)
    assert cfg_models.model_available("x/y") is False
    (tmp_path / "x" / "y").mkdir(parents=True)
    assert cfg_models.model_available("x/y") is True


def test_find_gguf_local_mode_filesystem_only(monkeypatch, tmp_path):
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_local_only", lambda: True)
    monkeypatch.setattr(cfg_models, "_cache_gguf", lambda repo, pat: "/cache/x.gguf")
    monkeypatch.setattr(cfg_models, "_online", lambda: True)
    repo = "unsloth/gemma-4-E2B-it-GGUF"
    with pytest.raises(cfg_models.ModelUnavailable):
        cfg_models.find_gguf(repo, "*Q4_K_M.gguf")  # cache/online ignorati
    base = tmp_path / repo
    base.mkdir(parents=True)
    (base / "m-Q4_K_M.gguf").write_bytes(b"x")
    assert Path(cfg_models.find_gguf(repo, "*Q4_K_M.gguf")) == base / "m-Q4_K_M.gguf"


def test_gguf_available_local_mode_filesystem_only(monkeypatch, tmp_path):
    monkeypatch.setattr(cfg_models, "MODELS_DIR", tmp_path)
    monkeypatch.setattr(cfg_models, "_local_only", lambda: True)
    monkeypatch.setattr(cfg_models, "_cache_gguf", lambda repo, pat: "/cache/x.gguf")
    monkeypatch.setattr(cfg_models, "_online", lambda: True)
    assert cfg_models.gguf_available("unsloth/gemma-4-E2B-it-GGUF", "*Q4_K_M.gguf") is False