"""Integration tests for the storage statistics endpoint (§A6).

Requires a reachable Postgres; skips otherwise.
"""

import asyncio
import os
from collections.abc import AsyncIterator
from pathlib import Path

import pytest
from app.core.config import get_settings
from app.infrastructure.db import Base, dispose_engine, get_engine, session_scope
from app.infrastructure.db.repositories import (
    SqlAlchemyRefreshTokenRepository,
    SqlAlchemyUserRepository,
)
from asgi_lifespan import LifespanManager
from httpx import ASGITransport, AsyncClient

pytestmark = pytest.mark.asyncio

_db_reachable_cache: bool | None = None


async def _db_reachable() -> bool:
    global _db_reachable_cache
    if _db_reachable_cache is not None:
        return _db_reachable_cache

    from sqlalchemy import text

    try:
        async with asyncio.timeout(3):
            async with get_engine().connect() as conn:
                await conn.execute(text("SELECT 1"))
        _db_reachable_cache = True
    except Exception:
        _db_reachable_cache = False
    return _db_reachable_cache


@pytest.fixture
async def api(tmp_path: Path) -> AsyncIterator[AsyncClient]:
    if not await _db_reachable():
        pytest.skip("Postgres not reachable — integration test skipped.")

    os.environ["MEDIA_PATH"] = str(tmp_path)
    get_settings.cache_clear()

    import app.infrastructure.storage.provider as _storage_provider

    _storage_provider._storage = None

    try:
        async with get_engine().begin() as conn:
            await conn.run_sync(Base.metadata.drop_all)
            await conn.run_sync(Base.metadata.create_all)

        from app.application.user_service import UserService
        from app.core.security import Argon2PasswordHasher

        async with session_scope() as session:
            await UserService(
                users=SqlAlchemyUserRepository(session),
                refresh_tokens=SqlAlchemyRefreshTokenRepository(session),
                hasher=Argon2PasswordHasher(),
            ).create_user(username="testuser", password="testpass1", is_superuser=False)

        from app.main import create_app

        app = create_app()
        async with LifespanManager(app):
            transport = ASGITransport(app=app)
            async with AsyncClient(transport=transport, base_url="http://test") as client:
                yield client

        async with get_engine().begin() as conn:
            await conn.run_sync(Base.metadata.drop_all)
        await dispose_engine()
    finally:
        _storage_provider._storage = None
        os.environ.pop("MEDIA_PATH", None)
        get_settings.cache_clear()


async def _login(api: AsyncClient) -> str:
    resp = await api.post(
        "/api/v1/auth/login", json={"username": "testuser", "password": "testpass1"}
    )
    assert resp.status_code == 200
    return str(resp.json()["access_token"])


async def _upload(api: AsyncClient, token: str, *, name: str) -> None:
    # Vary the bytes per file so dedup (by content) keeps them distinct.
    audio = (f"fake audio bytes for storage stats test {name}".encode()) * 10
    resp = await api.post(
        "/api/v1/upload",
        files={"file": (name, audio, "audio/mpeg")},
        headers={"Authorization": f"Bearer {token}"},
    )
    assert resp.status_code == 200, resp.text


async def test_storage_stats_requires_auth(api: AsyncClient) -> None:
    resp = await api.get("/api/v1/storage")
    assert resp.status_code == 401


async def test_storage_stats_empty_library(api: AsyncClient) -> None:
    token = await _login(api)
    resp = await api.get("/api/v1/storage", headers={"Authorization": f"Bearer {token}"})
    assert resp.status_code == 200, resp.text
    body = resp.json()
    assert body["total_tracks"] == 0
    assert body["total_size"] == 0
    assert body["by_format"] == []
    # Local backend reports a real disk in the test environment.
    assert body["disk"] is not None
    assert body["disk"]["total"] > 0


async def test_storage_stats_counts_uploads(api: AsyncClient) -> None:
    token = await _login(api)
    await _upload(api, token, name="one.mp3")
    await _upload(api, token, name="two.mp3")

    resp = await api.get("/api/v1/storage", headers={"Authorization": f"Bearer {token}"})
    assert resp.status_code == 200, resp.text
    body = resp.json()
    assert body["total_tracks"] == 2
    assert body["total_size"] > 0
    assert body["total_artists"] >= 1
    fmt = {f["file_format"]: f for f in body["by_format"]}
    assert "mp3" in fmt
    assert fmt["mp3"]["track_count"] == 2
    assert sum(body["by_source"].values()) == 2