import pytest
from fastapi.testclient import TestClient
from unittest.mock import MagicMock, AsyncMock
from src.app import app
from src.dependencies import get_config_manager, get_task_manager, get_resource_service, has_permission

client = TestClient(app)

# [DEF:test_dashboards_api:Test]
# @PURPOSE: Verify GET /api/dashboards contract compliance
# @TEST: Valid env_id returns 200 and dashboard list
# @TEST: Invalid env_id returns 404
# @TEST: Search filter works

@pytest.fixture
def mock_deps():
    config_manager = MagicMock()
    task_manager = MagicMock()
    resource_service = MagicMock()
    
    # Mock environment
    env = MagicMock()
    env.id = "env1"
    config_manager.get_environments.return_value = [env]
    
    # Mock tasks
    task_manager.get_all_tasks.return_value = []
    
    # Mock dashboards
    resource_service.get_dashboards_with_status = AsyncMock(return_value=[
        {"id": 1, "title": "Sales", "slug": "sales", "git_status": {"branch": "main", "sync_status": "OK"}, "last_task": None},
        {"id": 2, "title": "Marketing", "slug": "mkt", "git_status": None, "last_task": {"task_id": "t1", "status": "SUCCESS"}}
    ])
    
    app.dependency_overrides[get_config_manager] = lambda: config_manager
    app.dependency_overrides[get_task_manager] = lambda: task_manager
    app.dependency_overrides[get_resource_service] = lambda: resource_service
    
    # Bypass permission check
    mock_user = MagicMock()
    mock_user.username = "testadmin"
    mock_user.roles = []
    admin_role = MagicMock()
    admin_role.name = "Admin"
    mock_user.roles.append(admin_role)
    
    # Override both get_current_user and has_permission
    from src.dependencies import get_current_user
    app.dependency_overrides[get_current_user] = lambda: mock_user
    
    # We need to override the specific instance returned by has_permission
    app.dependency_overrides[has_permission("plugin:migration", "READ")] = lambda: mock_user
    
    yield {
        "config": config_manager,
        "task": task_manager,
        "resource": resource_service
    }
    
    app.dependency_overrides.clear()

def test_get_dashboards_success(mock_deps):
    response = client.get("/api/dashboards?env_id=env1")
    assert response.status_code == 200
    data = response.json()
    assert "dashboards" in data
    assert len(data["dashboards"]) == 2
    assert data["dashboards"][0]["title"] == "Sales"
    assert data["dashboards"][0]["git_status"]["sync_status"] == "OK"

def test_get_dashboards_not_found(mock_deps):
    response = client.get("/api/dashboards?env_id=invalid")
    assert response.status_code == 404

def test_get_dashboards_search(mock_deps):
    response = client.get("/api/dashboards?env_id=env1&search=Sales")
    assert response.status_code == 200
    data = response.json()
    assert len(data["dashboards"]) == 1
    assert data["dashboards"][0]["title"] == "Sales"

# [/DEF:test_dashboards_api:Test]

# [DEF:test_datasets_api:Test]
# @PURPOSE: Verify GET /api/datasets contract compliance
# @TEST: Valid env_id returns 200 and dataset list
# @TEST: Invalid env_id returns 404
# @TEST: Search filter works
# @TEST: Negative - Service failure returns 503

def test_get_datasets_success(mock_deps):
    mock_deps["resource"].get_datasets_with_status = AsyncMock(return_value=[
        {"id": 1, "table_name": "orders", "schema": "public", "database": "db1", "mapped_fields": {"total": 10, "mapped": 5}, "last_task": None}
    ])
    
    response = client.get("/api/datasets?env_id=env1")
    assert response.status_code == 200
    data = response.json()
    assert "datasets" in data
    assert len(data["datasets"]) == 1
    assert data["datasets"][0]["table_name"] == "orders"
    assert data["datasets"][0]["mapped_fields"]["mapped"] == 5

def test_get_datasets_not_found(mock_deps):
    response = client.get("/api/datasets?env_id=invalid")
    assert response.status_code == 404

def test_get_datasets_search(mock_deps):
    mock_deps["resource"].get_datasets_with_status = AsyncMock(return_value=[
        {"id": 1, "table_name": "orders", "schema": "public", "database": "db1", "mapped_fields": {"total": 10, "mapped": 5}, "last_task": None},
        {"id": 2, "table_name": "users", "schema": "public", "database": "db1", "mapped_fields": {"total": 5, "mapped": 5}, "last_task": None}
    ])
    
    response = client.get("/api/datasets?env_id=env1&search=orders")
    assert response.status_code == 200
    data = response.json()
    assert len(data["datasets"]) == 1
    assert data["datasets"][0]["table_name"] == "orders"

def test_get_datasets_service_failure(mock_deps):
    mock_deps["resource"].get_datasets_with_status = AsyncMock(side_effect=Exception("Superset down"))
    
    response = client.get("/api/datasets?env_id=env1")
    assert response.status_code == 503
    assert "Failed to fetch datasets" in response.json()["detail"]

# [/DEF:test_datasets_api:Test]


# [DEF:test_pagination_boundaries:Test]
# @PURPOSE: Verify pagination validation for GET endpoints
# @TEST: page<1 and page_size>100 return 400

def test_get_dashboards_pagination_zero_page(mock_deps):
    """@TEST_EDGE: pagination_zero_page -> {page:0, status:400}"""
    response = client.get("/api/dashboards?env_id=env1&page=0")
    assert response.status_code == 400
    assert "Page must be >= 1" in response.json()["detail"]

def test_get_dashboards_pagination_oversize(mock_deps):
    """@TEST_EDGE: pagination_oversize -> {page_size:101, status:400}"""
    response = client.get("/api/dashboards?env_id=env1&page_size=101")
    assert response.status_code == 400
    assert "Page size must be between 1 and 100" in response.json()["detail"]

def test_get_datasets_pagination_zero_page(mock_deps):
    """@TEST_EDGE: pagination_zero_page on datasets"""
    response = client.get("/api/datasets?env_id=env1&page=0")
    assert response.status_code == 400

def test_get_datasets_pagination_oversize(mock_deps):
    """@TEST_EDGE: pagination_oversize on datasets"""
    response = client.get("/api/datasets?env_id=env1&page_size=101")
    assert response.status_code == 400

# [/DEF:test_pagination_boundaries:Test]