"""Tests for model cache service and router."""
import json
import os
from datetime import datetime, timedelta, timezone
from unittest.mock import AsyncMock, patch

import pytest
import pytest_asyncio
from httpx import ASGITransport, AsyncClient

from app import db as db_module
from app.main import app
from app.services.models import (
    _extract_output_modality,
    _normalize_modality,
    _parse_modality,
    get_cached_models,
    is_cache_stale,
    refresh_models_cache,
)

os.environ.setdefault("JWT_SECRET", "test-secret-key-for-testing-only")
os.environ.setdefault("OPENROUTER_API_KEY", "test-key")

FAKE_MODELS_RAW = [
    {
        "id": "openai/gpt-4o",
        "name": "GPT-4o",
        "context_length": 128000,
        "pricing": {"prompt": "0.000005"},
        "architecture": {"modality": "text->text"},
    },
    {
        "id": "anthropic/claude-3-haiku",
        "name": "Claude 3 Haiku",
        "context_length": 200000,
        "pricing": {},
        "architecture": {"modality": "text+image->text"},
    },
    {
        "id": "openai/dall-e-3",
        "name": "DALL-E 3",
        "context_length": None,
        "pricing": {"image": "0.04"},
        "architecture": {"modality": "text->image"},
    },
    {
        "id": "openai/sora-2",
        "name": "Sora 2",
        "context_length": None,
        "pricing": {"video": "0.10"},
        "architecture": {"modality": "text->video"},
    },
]


@pytest.fixture(autouse=True)
def fresh_db():
    db_module._conn = None
    db_module.init_db(":memory:")
    yield
    db_module.close_db()
    db_module._conn = None


@pytest_asyncio.fixture
async def client(fresh_db):
    transport = ASGITransport(app=app)
    async with AsyncClient(transport=transport, base_url="http://test") as ac:
        yield ac


async def _register_login(client, email, password, is_admin=False):
    """Register + login; optionally promote to admin directly in DB."""
    await client.post("/auth/register", json={"email": email, "password": password})
    if is_admin:
        db_module.get_conn().execute(
            "UPDATE users SET role = 'admin' WHERE email = ?", [email]
        )
    resp = await client.post("/auth/login", json={"email": email, "password": password})
    return resp.json()["access_token"]


# ---------------------------------------------------------------------------
# Unit tests: _parse_modality
# ---------------------------------------------------------------------------

def test_parse_modality_text():
    assert _parse_modality("text->text") == "text"


def test_parse_modality_multimodal_input_text_output():
    assert _parse_modality("text+image->text") == "text"


def test_parse_modality_image():
    assert _parse_modality("text->image") == "image"


def test_parse_modality_video():
    assert _parse_modality("text->video") == "video"


def test_parse_modality_audio():
    assert _parse_modality("text->audio") == "audio"


def test_parse_modality_no_arrow_fallback():
    assert _parse_modality("text") == "text"


def test_normalize_embedding_alias():
    assert _normalize_modality("embedding") == "embeddings"


def test_extract_output_modality_prefers_output_modalities():
    model = {
        "architecture": {
            "modality": "text->text",
            "output_modalities": ["image"],
        }
    }
    assert _extract_output_modality(model) == "image"


def test_extract_output_modality_legacy_fallback():
    model = {"architecture": {"modality": "text->audio"}}
    assert _extract_output_modality(model) == "audio"


# ---------------------------------------------------------------------------
# Unit tests: is_cache_stale
# ---------------------------------------------------------------------------

def test_cache_stale_when_empty():
    conn = db_module.get_conn()
    assert is_cache_stale(conn) is True


def test_cache_not_stale_after_fresh_insert():
    conn = db_module.get_conn()
    now = datetime.now(timezone.utc).replace(tzinfo=None)
    conn.execute(
        "INSERT INTO models_cache (model_id, name, modality, fetched_at) VALUES (?, ?, ?, ?)",
        ["openai/gpt-4o", "GPT-4o", "text", now],
    )
    assert is_cache_stale(conn) is False


def test_cache_stale_after_ttl_exceeded():
    conn = db_module.get_conn()
    # Store naive UTC to match DuckDB TIMESTAMP behaviour
    old_time = datetime.now(timezone.utc).replace(
        tzinfo=None) - timedelta(hours=25)
    conn.execute(
        "INSERT INTO models_cache (model_id, name, modality, fetched_at) VALUES (?, ?, ?, ?)",
        ["openai/gpt-4o", "GPT-4o", "text", old_time],
    )
    assert is_cache_stale(conn) is True


# ---------------------------------------------------------------------------
# Unit tests: refresh_models_cache + get_cached_models
# ---------------------------------------------------------------------------

async def test_refresh_stores_models():
    conn = db_module.get_conn()
    with patch(
        "app.services.models.openrouter.list_models",
        new_callable=AsyncMock,
        return_value=FAKE_MODELS_RAW,
    ):
        count = await refresh_models_cache(conn)
    assert count == 4
    all_models = get_cached_models(conn)
    assert len(all_models) == 4


async def test_refresh_replaces_old_cache():
    conn = db_module.get_conn()
    old_time = datetime.now(timezone.utc).replace(
        tzinfo=None) - timedelta(hours=30)
    conn.execute(
        "INSERT INTO models_cache (model_id, name, modality, fetched_at) VALUES (?, ?, ?, ?)",
        ["old/model", "Old Model", "text", old_time],
    )
    with patch(
        "app.services.models.openrouter.list_models",
        new_callable=AsyncMock,
        return_value=FAKE_MODELS_RAW,
    ):
        await refresh_models_cache(conn)
    ids = [m["id"] for m in get_cached_models(conn)]
    assert "old/model" not in ids
    assert "openai/gpt-4o" in ids


def test_get_cached_models_filter_by_modality():
    conn = db_module.get_conn()
    now = datetime.now(timezone.utc).replace(tzinfo=None)
    for m in FAKE_MODELS_RAW:
        arch = m.get("architecture", {})
        modality = _parse_modality(arch.get("modality", "text->text"))
        conn.execute(
            "INSERT INTO models_cache (model_id, name, modality, fetched_at) VALUES (?, ?, ?, ?)",
            [m["id"], m["name"], modality, now],
        )
    text_models = get_cached_models(conn, modality="text")
    assert len(text_models) == 2
    assert all(m["modality"] == "text" for m in text_models)

    image_models = get_cached_models(conn, modality="image")
    assert len(image_models) == 1
    assert image_models[0]["id"] == "openai/dall-e-3"

    video_models = get_cached_models(conn, modality="video")
    assert len(video_models) == 1
    assert video_models[0]["id"] == "openai/sora-2"


# ---------------------------------------------------------------------------
# Integration tests: GET /models/
# ---------------------------------------------------------------------------

async def test_list_models_endpoint_auto_refreshes(client):
    token = await _register_login(client, "user@example.com", "secret123")
    with patch(
        "app.services.models.openrouter.list_models",
        new_callable=AsyncMock,
        return_value=FAKE_MODELS_RAW,
    ) as mock_fetch:
        resp = await client.get(
            "/models/", headers={"Authorization": f"Bearer {token}"}
        )
    assert resp.status_code == 200
    assert len(resp.json()) == 4
    assert mock_fetch.await_count >= 1


async def test_list_models_endpoint_uses_cache(client):
    token = await _register_login(client, "user@example.com", "secret123")
    conn = db_module.get_conn()
    now = datetime.now(timezone.utc).replace(tzinfo=None)
    conn.execute(
        "INSERT INTO models_cache (model_id, name, modality, fetched_at) VALUES (?, ?, ?, ?)",
        ["cached/model", "Cached Model", "text", now],
    )
    with patch(
        "app.services.models.openrouter.list_models",
        new_callable=AsyncMock,
    ) as mock_fetch:
        resp = await client.get(
            "/models/?modality=text", headers={"Authorization": f"Bearer {token}"}
        )
    assert resp.status_code == 200
    assert resp.json()[0]["id"] == "cached/model"
    mock_fetch.assert_not_awaited()


async def test_list_models_endpoint_requires_auth(client):
    resp = await client.get("/models/")
    assert resp.status_code == 401


async def test_list_models_filter_by_modality(client):
    token = await _register_login(client, "user@example.com", "secret123")
    with patch(
        "app.services.models.openrouter.list_models",
        new_callable=AsyncMock,
        return_value=FAKE_MODELS_RAW,
    ):
        resp = await client.get(
            "/models/?modality=image", headers={"Authorization": f"Bearer {token}"}
        )
    assert resp.status_code == 200
    data = resp.json()
    assert len(data) == 1
    assert data[0]["id"] == "openai/dall-e-3"


# ---------------------------------------------------------------------------
# Integration tests: POST /models/refresh
# ---------------------------------------------------------------------------

async def test_refresh_endpoint_requires_admin(client):
    token = await _register_login(client, "user@example.com", "secret123")
    resp = await client.post(
        "/models/refresh", headers={"Authorization": f"Bearer {token}"}
    )
    assert resp.status_code == 403


async def test_refresh_endpoint_admin_succeeds(client):
    token = await _register_login(client, "admin@example.com", "secret123", is_admin=True)
    with patch(
        "app.services.models.openrouter.list_models",
        new_callable=AsyncMock,
        return_value=FAKE_MODELS_RAW,
    ):
        resp = await client.post(
            "/models/refresh", headers={"Authorization": f"Bearer {token}"}
        )
    assert resp.status_code == 200
    assert resp.json()["refreshed"] == 4


async def test_refresh_endpoint_502_on_openrouter_error(client):
    token = await _register_login(client, "admin@example.com", "secret123", is_admin=True)
    with patch(
        "app.services.models.openrouter.list_models",
        new_callable=AsyncMock,
        side_effect=RuntimeError("network error"),
    ):
        resp = await client.post(
            "/models/refresh", headers={"Authorization": f"Bearer {token}"}
        )
    assert resp.status_code == 502