import pytest
from unittest.mock import AsyncMock, patch, MagicMock
from fastapi import FastAPI
from fastapi.testclient import TestClient

from app.api.v1.data import data_router

app = FastAPI()
app.include_router(data_router, prefix="/v1")

@pytest.fixture
def data_client():
    from app.api.v1.data import acccess_token_bearer
    
    # Override authentication and authorization
    app.dependency_overrides[acccess_token_bearer] = lambda: {"user_id": "test_user"}
    
    with TestClient(app) as client:
        yield client
        
    app.dependency_overrides.clear()

@pytest.fixture
def mock_data_service():
    with patch("app.api.v1.data.data_service") as mock_service:
        yield mock_service

def test_read_from_url(data_client, mock_data_service):
    mock_data_service.read_file = AsyncMock(return_value={"data": "parsed contents"})
    
    response = data_client.get("/v1/data/read-file?url=http://example.com/data.csv")
    assert response.status_code == 200
    assert response.json()["status"] is True
    assert response.json()["data"] == "parsed contents"
    mock_data_service.read_file.assert_called_once_with("http://example.com/data.csv")

def test_save_metadata(data_client, mock_data_service):
    mock_data_service.save_metadata = AsyncMock(return_value="mock_id_123")
    
    payload = {
        "columns": {"feature_1": "float"},
        "target_columns": ["target"],
        "file_url": "http://example.com/data.csv"
    }
    
    response = data_client.post("/v1/data/metadata", json=payload)
    assert response.status_code == 200
    assert response.json()["message"] == "Metadata saved successfully"
    mock_data_service.save_metadata.assert_called_once()

def test_update_metadata_success(data_client, mock_data_service):
    mock_data_service.update_metadata = AsyncMock(return_value=True)
    
    payload = {
        "metadata_id": "meta_1",
        "columns": {"feature_1": "float", "feature_2": "int"}
    }
    
    response = data_client.put("/v1/data/metadata", json=payload)
    assert response.status_code == 200
    assert response.json()["message"] == "Metadata updated successfully"

def test_get_column_types(data_client):
    response = data_client.get("/v1/data/column-types")
    assert response.status_code == 200
    assert response.json()["status"] is True
    assert "data" in response.json()