"""
Unit tests for Task API endpoints.
Tests CRUD operations for tasks.
"""
import pytest
import os
import json
from fastapi.testclient import TestClient

# Use a test database
TEST_DB_PATH = "test_task_annotation_platform.db"


@pytest.fixture(scope="function", autouse=True)
def setup_test_db():
    """Setup test database before each test and cleanup after."""
    # Set test database path
    original_db_path = os.environ.get("DATABASE_PATH")
    os.environ["DATABASE_PATH"] = TEST_DB_PATH
    
    # Remove existing test database
    if os.path.exists(TEST_DB_PATH):
        os.remove(TEST_DB_PATH)
    
    # Import after setting env var
    from database import init_database
    init_database()
    
    yield
    
    # Cleanup
    if os.path.exists(TEST_DB_PATH):
        os.remove(TEST_DB_PATH)
    
    # Restore original path
    if original_db_path:
        os.environ["DATABASE_PATH"] = original_db_path
    elif "DATABASE_PATH" in os.environ:
        del os.environ["DATABASE_PATH"]


@pytest.fixture(scope="function")
def test_client():
    """Create a test client."""
    from main import app
    return TestClient(app)


@pytest.fixture(scope="function")
def sample_project(test_client):
    """Create a sample project for testing."""
    project_data = {
        "name": "Test Project",
        "description": "Test Description",
        "config": "<View><Image name='img' value='$image'/></View>"
    }
    response = test_client.post("/api/projects", json=project_data)
    return response.json()


def test_list_tasks_empty(test_client):
    """Test listing tasks when database is empty."""
    response = test_client.get("/api/tasks")
    assert response.status_code == 200
    assert response.json() == []


def test_create_task(test_client, sample_project):
    """Test creating a new task."""
    task_data = {
        "project_id": sample_project["id"],
        "name": "Test Task",
        "data": {"image_url": "https://example.com/image.jpg"},
        "assigned_to": "user_001"
    }
    
    response = test_client.post("/api/tasks", json=task_data)
    assert response.status_code == 201
    
    data = response.json()
    assert data["name"] == task_data["name"]
    assert data["project_id"] == task_data["project_id"]
    assert data["data"] == task_data["data"]
    assert data["assigned_to"] == task_data["assigned_to"]
    assert data["status"] == "pending"
    assert "id" in data
    assert data["id"].startswith("task_")
    assert data["progress"] == 0.0
    assert "created_at" in data


def test_create_task_invalid_project(test_client):
    """Test creating a task with invalid project_id fails."""
    task_data = {
        "project_id": "nonexistent_project",
        "name": "Test Task",
        "data": {"image_url": "https://example.com/image.jpg"}
    }
    
    response = test_client.post("/api/tasks", json=task_data)
    assert response.status_code == 404
    assert "not found" in response.json()["detail"].lower()


def test_get_task(test_client, sample_project):
    """Test getting a task by ID."""
    # Create a task first
    task_data = {
        "project_id": sample_project["id"],
        "name": "Test Task",
        "data": {"image_url": "https://example.com/image.jpg"}
    }
    create_response = test_client.post("/api/tasks", json=task_data)
    task_id = create_response.json()["id"]
    
    # Get the task
    response = test_client.get(f"/api/tasks/{task_id}")
    assert response.status_code == 200
    
    data = response.json()
    assert data["id"] == task_id
    assert data["name"] == task_data["name"]


def test_get_task_not_found(test_client):
    """Test getting a non-existent task returns 404."""
    response = test_client.get("/api/tasks/nonexistent_id")
    assert response.status_code == 404
    assert "not found" in response.json()["detail"].lower()


def test_update_task(test_client, sample_project):
    """Test updating a task."""
    # Create a task first
    task_data = {
        "project_id": sample_project["id"],
        "name": "Original Name",
        "data": {"image_url": "https://example.com/image.jpg"}
    }
    create_response = test_client.post("/api/tasks", json=task_data)
    task_id = create_response.json()["id"]
    
    # Update the task
    update_data = {
        "name": "Updated Name",
        "status": "in_progress"
    }
    response = test_client.put(f"/api/tasks/{task_id}", json=update_data)
    assert response.status_code == 200
    
    data = response.json()
    assert data["name"] == update_data["name"]
    assert data["status"] == update_data["status"]
    assert data["data"] == task_data["data"]  # Data unchanged


def test_update_task_not_found(test_client):
    """Test updating a non-existent task returns 404."""
    update_data = {"name": "Updated Name"}
    response = test_client.put("/api/tasks/nonexistent_id", json=update_data)
    assert response.status_code == 404


def test_delete_task(test_client, sample_project):
    """Test deleting a task."""
    # Create a task first
    task_data = {
        "project_id": sample_project["id"],
        "name": "Test Task",
        "data": {"image_url": "https://example.com/image.jpg"}
    }
    create_response = test_client.post("/api/tasks", json=task_data)
    task_id = create_response.json()["id"]
    
    # Delete the task
    response = test_client.delete(f"/api/tasks/{task_id}")
    assert response.status_code == 204
    
    # Verify task is deleted
    get_response = test_client.get(f"/api/tasks/{task_id}")
    assert get_response.status_code == 404


def test_delete_task_not_found(test_client):
    """Test deleting a non-existent task returns 404."""
    response = test_client.delete("/api/tasks/nonexistent_id")
    assert response.status_code == 404


def test_list_tasks_after_creation(test_client, sample_project):
    """Test listing tasks after creating some."""
    # Create multiple tasks
    for i in range(3):
        task_data = {
            "project_id": sample_project["id"],
            "name": f"Task {i}",
            "data": {"image_url": f"https://example.com/image{i}.jpg"}
        }
        test_client.post("/api/tasks", json=task_data)
    
    # List tasks
    response = test_client.get("/api/tasks")
    assert response.status_code == 200
    
    data = response.json()
    assert len(data) == 3
    assert all("id" in task for task in data)
    assert all("progress" in task for task in data)


def test_list_tasks_filter_by_project(test_client, sample_project):
    """Test filtering tasks by project_id."""
    # Create another project
    project2_data = {
        "name": "Project 2",
        "description": "Description 2",
        "config": "<View></View>"
    }
    project2_response = test_client.post("/api/projects", json=project2_data)
    project2 = project2_response.json()
    
    # Create tasks for both projects
    task1_data = {
        "project_id": sample_project["id"],
        "name": "Task 1",
        "data": {"image_url": "https://example.com/image1.jpg"}
    }
    test_client.post("/api/tasks", json=task1_data)
    
    task2_data = {
        "project_id": project2["id"],
        "name": "Task 2",
        "data": {"image_url": "https://example.com/image2.jpg"}
    }
    test_client.post("/api/tasks", json=task2_data)
    
    # Filter by first project
    response = test_client.get(f"/api/tasks?project_id={sample_project['id']}")
    assert response.status_code == 200
    
    data = response.json()
    assert len(data) == 1
    assert data[0]["project_id"] == sample_project["id"]


def test_list_tasks_filter_by_status(test_client, sample_project):
    """Test filtering tasks by status."""
    # Create tasks with different statuses
    task1_data = {
        "project_id": sample_project["id"],
        "name": "Task 1",
        "data": {"image_url": "https://example.com/image1.jpg"}
    }
    response1 = test_client.post("/api/tasks", json=task1_data)
    task1_id = response1.json()["id"]
    
    task2_data = {
        "project_id": sample_project["id"],
        "name": "Task 2",
        "data": {"image_url": "https://example.com/image2.jpg"}
    }
    test_client.post("/api/tasks", json=task2_data)
    
    # Update first task status
    test_client.put(f"/api/tasks/{task1_id}", json={"status": "in_progress"})
    
    # Filter by status
    response = test_client.get("/api/tasks?status=in_progress")
    assert response.status_code == 200
    
    data = response.json()
    assert len(data) == 1
    assert data[0]["status"] == "in_progress"


def test_get_project_tasks(test_client, sample_project):
    """Test getting all tasks for a specific project."""
    # Create tasks for the project
    for i in range(2):
        task_data = {
            "project_id": sample_project["id"],
            "name": f"Task {i}",
            "data": {"image_url": f"https://example.com/image{i}.jpg"}
        }
        test_client.post("/api/tasks", json=task_data)
    
    # Get project tasks using the alternative endpoint
    response = test_client.get(f"/api/tasks/projects/{sample_project['id']}/tasks")
    assert response.status_code == 200
    
    data = response.json()
    assert len(data) == 2
    assert all(task["project_id"] == sample_project["id"] for task in data)


def test_get_project_tasks_not_found(test_client):
    """Test getting tasks for non-existent project returns 404."""
    response = test_client.get("/api/tasks/projects/nonexistent_id/tasks")
    assert response.status_code == 404