"""Unit tests for SSH tunnel concepts and patterns.

These tests verify SSH tunneling concepts without mocking external dependencies.
"""

from datetime import datetime, timezone

from flow.api.models import Task, TaskConfig, TaskStatus


class TestSSHTunnelConcepts:
    """Test SSH tunnel concepts and patterns."""

    def test_task_with_service_endpoints(self):
        """Test that tasks can have service endpoints for tunneling."""
        task = Task(
            task_id="jupyter-task",
            name="jupyter-server",
            status=TaskStatus.RUNNING,
            config=TaskConfig(
                name="jupyter-server",
                instance_type="a100",
                command=["jupyter", "notebook", "--port=8888"]
            ),
            created_at=datetime.now(timezone.utc),
            instance_type="a100",
            num_instances=1,
            region="us-central1-a",
            cost_per_hour="$10.00",
            ssh_host="1.2.3.4",
            ssh_port=22,
            ssh_user="ubuntu",
            endpoints={"jupyter": "http://localhost:8888"}
        )

        # Verify task has endpoints that could be tunneled
        assert "jupyter" in task.endpoints
        assert "8888" in task.endpoints["jupyter"]

        # Verify SSH details are available for creating tunnel
        assert task.ssh_host is not None
        assert task.ssh_port is not None
        assert task.ssh_user is not None

    def test_multiple_service_endpoints(self):
        """Test tasks can have multiple service endpoints."""
        endpoints = {
            "jupyter": "http://localhost:8888",
            "tensorboard": "http://localhost:6006",
            "mlflow": "http://localhost:5000"
        }

        task = Task(
            task_id="multi-service-task",
            name="ml-workspace",
            status=TaskStatus.RUNNING,
            config=TaskConfig(
                name="ml-workspace",
                instance_type="a100",
                command=["start-services.sh"]
            ),
            created_at=datetime.now(timezone.utc),
            instance_type="a100",
            num_instances=1,
            region="us-central1-a",
            cost_per_hour="$10.00",
            ssh_host="10.0.0.1",
            ssh_port=22,
            ssh_user="ubuntu",
            endpoints=endpoints
        )

        # Verify all endpoints are accessible
        assert len(task.endpoints) == 3
        assert all(service in task.endpoints for service in ["jupyter", "tensorboard", "mlflow"])

    def test_ssh_tunnel_port_extraction(self):
        """Test extracting port numbers from endpoint URLs."""
        endpoints = {
            "service1": "http://localhost:8080",
            "service2": "https://localhost:443",
            "service3": "http://localhost:9999/path"
        }

        # Extract ports from URLs
        ports = {}
        for service, url in endpoints.items():
            # Simple port extraction logic
            if ":" in url.split("//")[1]:
                port_str = url.split("//")[1].split(":")[1].split("/")[0]
                ports[service] = int(port_str)
            elif "https" in url:
                ports[service] = 443
            else:
                ports[service] = 80

        assert ports["service1"] == 8080
        assert ports["service2"] == 443
        assert ports["service3"] == 9999

    def test_tunnel_configuration_data_structure(self):
        """Test data structure for tunnel configuration."""
        # Example tunnel configuration
        tunnel_config = {
            "local_port": 8888,
            "remote_port": 8888,
            "remote_host": "localhost",
            "ssh_host": "1.2.3.4",
            "ssh_port": 22,
            "ssh_user": "ubuntu"
        }

        # Verify all required fields are present
        required_fields = ["local_port", "remote_port", "ssh_host", "ssh_port", "ssh_user"]
        assert all(field in tunnel_config for field in required_fields)

        # Verify types
        assert isinstance(tunnel_config["local_port"], int)
        assert isinstance(tunnel_config["remote_port"], int)
        assert isinstance(tunnel_config["ssh_port"], int)

    def test_dynamic_port_allocation_concept(self):
        """Test concept of dynamic local port allocation."""
        # When creating multiple tunnels, we might need unique local ports
        remote_services = [8888, 6006, 5000]
        local_port_base = 9000

        tunnels = []
        for i, remote_port in enumerate(remote_services):
            tunnel = {
                "local_port": local_port_base + i,
                "remote_port": remote_port
            }
            tunnels.append(tunnel)

        # Verify unique local ports
        local_ports = [t["local_port"] for t in tunnels]
        assert len(set(local_ports)) == len(local_ports)

        # Verify mapping
        assert tunnels[0]["local_port"] == 9000
        assert tunnels[0]["remote_port"] == 8888
