"""FlowDeck — pytest fixtures and configuration.

Each test gets a fresh, isolated SQLite database and backup directory so the
suite is safe to run in parallel (``pytest -n auto``): workers never share a
database file, and no state leaks between tests.
"""
import os
import tempfile
from pathlib import Path

import pytest
from fastapi.testclient import TestClient


@pytest.fixture
def client():
    """FastAPI TestClient with a fresh temporary SQLite database."""
    db_file = tempfile.NamedTemporaryFile(suffix=".db", delete=False)
    db_path = db_file.name
    db_file.close()

    backup_dir = tempfile.mkdtemp(prefix="fd_backups_")

    # Set env BEFORE importing app modules (config reads at import time).
    os.environ["DATABASE_URL"] = f"sqlite:///{db_path}"
    os.environ["APP_SECRET_KEY"] = "test-secret-for-tests"
    os.environ["RATE_LIMIT_ENABLED"] = "false"
    os.environ["BACKUP_ENABLED"] = "true"
    os.environ["BACKUP_DIR"] = backup_dir
    os.environ["PROJECT_SYNC_ENABLED"] = "false"

    # IMPORTANT: mutate the existing Settings singleton in place — do NOT rebind
    # `app.config.settings`. Modules such as `app.services.backup` and
    # `app.routers.auth` hold a direct reference imported at load time, so
    # rebinding would leave them pointing at the stale defaults (this was the
    # cause of the previously-skipped flaky backup tests).
    import app.config
    s = app.config.settings
    s.database_url = f"sqlite:///{db_path}"
    s.app_secret_key = "test-secret-for-tests"
    s.rate_limit_enabled = False
    s.backup_enabled = True
    s.backup_dir = backup_dir
    s.backup_interval_hours = 24
    s.backup_keep = 30
    s.project_sync_enabled = False

    from app.db import init_db
    from app.main import app
    init_db()

    yield TestClient(app)

    # Cleanup
    try:
        os.unlink(db_path)
    except PermissionError:
        pass  # Windows: file may still be open in another thread
    for p in Path(backup_dir).glob("*.db"):
        try:
            p.unlink()
        except PermissionError:
            pass
    try:
        Path(backup_dir).rmdir()
    except OSError:
        pass