import json
import pytest
from backend.app import create_app  # Adjust import paths based on your folder structure


@pytest.fixture
def client():
    app = create_app()
    app.config["TESTING"] = True

    # Optionally: use a test-specific MongoDB URI.
    # app.config["MONGO_URI"] = "your_test_mongodb_connection_string"

    with app.test_client() as client:
        yield client


def test_register_and_login(client):
    # Registration test.
    reg_payload = {
        "username": "test",
        "email": "test@example.com",
        "password": "1234"
    }
    response = client.post(
        "/api/register",
        data=json.dumps(reg_payload),
        content_type="application/json"
    )
    assert response.status_code == 201
    reg_data = json.loads(response.data)
    assert "token" in reg_data
    user_id = reg_data["user_id"]

    # Login test.
    login_payload = {
        "username": "test",
        "password": "1234"
    }
    response = client.post(
        "/api/login",
        data=json.dumps(login_payload),
        content_type="application/json"
    )
    assert response.status_code == 200
    login_data = json.loads(response.data)
    assert "token" in login_data
    assert user_id == login_data["user_id"]


def test_delete_account(client):
    # Step 1: Register a new user
    reg_payload = {
        "username": "testuse",
        "email": "testuse@example.com",
        "password": "TestPassword123"
    }
    response = client.post(
        "/api/register",
        data=json.dumps(reg_payload),
        content_type="application/json"
    )
    assert response.status_code == 201
    reg_data = json.loads(response.data)
    token = reg_data["token"]
    user_id = reg_data["user_id"]

    # Step 2: Optionally, login to verify credentials and obtain a fresh token
    login_payload = {
        "username": "testuse",
        "password": "TestPassword123"
    }
    response = client.post(
        "/api/login",
        data=json.dumps(login_payload),
        content_type="application/json"
    )
    assert response.status_code == 200
    login_data = json.loads(response.data)
    assert "token" in login_data
    assert user_id == login_data["user_id"]

    # Use the token from login (or registration) and add the "Bearer" prefix as expected.
    headers = {"Authorization": f"Bearer {login_data['token']}"}

    # Step 3: Call the delete_account endpoint using the DELETE method.
    response = client.delete("/api/delete_account", headers=headers)
    # Expecting a successful deletion, i.e. status code 200.
    assert response.status_code == 200
    delete_data = json.loads(response.data)
    assert "deleted successfully" in delete_data["message"]