"""
Basic unit tests for Azure Firewall functionality (Solution 4).

These tests verify:
- Firewall command structure
- Basic validation logic
- CLI argument parsing
"""

import unittest
import sys
import os

# Add parent directory to path
sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))


class TestFirewallBasics(unittest.TestCase):
    """Basic tests for firewall functionality without Azure SDK dependencies."""
    
    def test_firewall_subnet_validation(self):
        """Test subnet name validation logic."""
        # Azure Firewall requires subnet to be named "AzureFirewallSubnet"
        valid_subnet = "AzureFirewallSubnet"
        invalid_subnet = "MyCustomSubnet"
        
        # Test the validation logic
        self.assertEqual(valid_subnet, "AzureFirewallSubnet")
        self.assertNotEqual(invalid_subnet, "AzureFirewallSubnet")
    
    def test_protocol_validation(self):
        """Test protocol validation for DNAT rules."""
        valid_protocols = ["TCP", "UDP", "ANY"]
        invalid_protocol = "ICMP"
        
        # Verify valid protocols
        for protocol in valid_protocols:
            self.assertIn(protocol, ["TCP", "UDP", "ANY"])
        
        # Verify invalid protocol
        self.assertNotIn(invalid_protocol, valid_protocols)
    
    def test_port_number_ranges(self):
        """Test port number validation."""
        valid_port = 5060
        invalid_port_low = 0
        invalid_port_high = 65536
        
        # Valid port
        self.assertTrue(1 <= valid_port <= 65535)
        
        # Invalid ports
        self.assertFalse(1 <= invalid_port_low <= 65535)
        self.assertFalse(1 <= invalid_port_high <= 65535)


class TestFirewallDocumentation(unittest.TestCase):
    """Test documentation and help text for firewall commands."""
    
    def test_firewall_cost_warning(self):
        """Test that firewall cost is properly documented."""
        cost_per_hour = 1.25
        hours_per_month = 730  # Approximate
        monthly_cost = cost_per_hour * hours_per_month
        
        # Verify cost calculation
        self.assertAlmostEqual(monthly_cost, 912.5, delta=20)
        self.assertTrue(800 <= monthly_cost <= 1000, 
                       f"Monthly cost should be ~$900, got ${monthly_cost}")
    
    def test_firewall_vs_bidirectional_cost_comparison(self):
        """Test cost comparison between firewall and bidirectional solutions."""
        # Solution 4 (Firewall) cost per month
        firewall_cost = 900
        
        # Solution 1 (Bidirectional) cost per month
        public_ip_cost = 3.60
        bidirectional_cost = 13  # Approximate
        
        # Firewall is significantly more expensive
        self.assertTrue(firewall_cost > bidirectional_cost * 50,
                       "Firewall should be much more expensive than bidirectional")
        
        # Document the cost difference
        cost_difference = firewall_cost - bidirectional_cost
        self.assertTrue(cost_difference > 800,
                       f"Cost difference should be substantial: ${cost_difference}")


if __name__ == '__main__':
    unittest.main()
