import pytest
import tempfile
import subprocess
import random
import os
import time
import requests


@pytest.fixture    
def temp():
    """Write data to a temporary file and return the handle
    This is a fixture instead of a utility function so that
    temporary files have a test-scoped lifetime
    """
    handles = []
    def fun(data):
        handle = tempfile.NamedTemporaryFile(delete=False)
        if type(data) is str:
            data = data.encode("utf8")
        handle.write(data)
        handle.flush()
        handles.append(handle)
        return handle.name
    yield fun
    del handles  # Useless but explicit


@pytest.fixture(scope="module")
def app(username, password):
    """Run an isolated application instance and return the URL"""
    data = tempfile.TemporaryDirectory()
    port = 5000 + random.randint(1, 999)  # Port = 5XXX
    url = f"http://localhost:{port}"
    env = os.environ
    env.update(FLASK_APP="hiboo", SQLALCHEMY_DATABASE_URI=f"sqlite:///{data.name}/hiboo.db")
    subprocess.run(["flask", "db", "upgrade"], env=env)
    subprocess.run(["flask", "user", "create", username, password], env=env)
    subprocess.run(["flask", "user", "promote", username], env=env)
    proc = subprocess.Popen(["flask", "run", "-p", str(port)], env=env)
    # Wait for the server to be ready
    for _ in range(30):
        try:
            assert requests.get(url).status_code == 200
        except Exception as e:
            print(e)
            time.sleep(1)
        else:
            yield url
            break
    proc.terminate()
    proc.wait()
    del data


@pytest.fixture(scope="session")
def username():
    """Default username for tests"""
    return "admin"


@pytest.fixture(scope="session")
def password():
    """Default password for tests"""
    return "admin"


@pytest.fixture
def service_name():
    """A randomly generated service name"""
    return "Test service " + random.randbytes(3).hex()