import unittest

from backend.agent_tools import (
    classify_agent_command,
    classify_kubectl_command,
    classify_shell_command,
    parse_kubectl_command,
    parse_shell_command,
)


class KubectlCommandPolicyTest(unittest.TestCase):
    def test_allows_read_only_kubectl_command_for_autonomous_execution(self):
        decision = classify_kubectl_command("kubectl get pods -n production -o wide")

        self.assertEqual(decision.mode, "read")
        self.assertFalse(decision.requires_approval)

    def test_requires_approval_for_mutating_kubectl_command(self):
        decision = classify_kubectl_command("kubectl rollout restart deployment/api -n production")

        self.assertEqual(decision.mode, "write")
        self.assertTrue(decision.requires_approval)

    def test_rejects_shell_operators_and_non_kubectl_commands(self):
        for command in (
            "kubectl get pods; rm -rf /",
            "kubectl get pods | sh",
            "bash -c kubectl get pods",
            "sudo kubectl get pods",
        ):
            with self.subTest(command=command):
                with self.assertRaises(ValueError):
                    parse_kubectl_command(command)

    def test_rejects_exec_even_when_command_looks_read_only(self):
        decision = classify_kubectl_command("kubectl exec api-0 -- cat /etc/hosts")

        self.assertEqual(decision.mode, "write")
        self.assertTrue(decision.requires_approval)


class ShellCommandPolicyTest(unittest.TestCase):
    def test_allows_read_only_systemctl_status_for_autonomous_execution(self):
        decision = classify_shell_command("systemctl status kubelet")

        self.assertEqual(decision.mode, "read")
        self.assertFalse(decision.requires_approval)

    def test_allows_journalctl_with_flags(self):
        decision = classify_shell_command("journalctl -u kubelet -n 100 --no-pager")

        self.assertEqual(decision.mode, "read")
        self.assertFalse(decision.requires_approval)

    def test_allows_crictl_ps(self):
        decision = classify_shell_command("crictl ps -a")

        self.assertEqual(decision.mode, "read")
        self.assertFalse(decision.requires_approval)

    def test_allows_df_and_free(self):
        for command in ("df -h", "free -m", "uptime"):
            with self.subTest(command=command):
                decision = classify_shell_command(command)
                self.assertEqual(decision.mode, "read")
                self.assertFalse(decision.requires_approval)

    def test_allows_ip_addr(self):
        decision = classify_shell_command("ip addr show")

        self.assertEqual(decision.mode, "read")
        self.assertFalse(decision.requires_approval)

    def test_requires_approval_for_systemctl_restart(self):
        decision = classify_shell_command("systemctl restart kubelet")

        self.assertEqual(decision.mode, "write")
        self.assertTrue(decision.requires_approval)

    def test_rejects_unknown_binary(self):
        with self.assertRaises(ValueError):
            classify_shell_command("rm -rf /")

    def test_rejects_shell_operators_in_shell_command(self):
        for command in (
            "systemctl status kubelet; rm -rf /",
            "df -h | grep vda",
            "journalctl -u kubelet > /tmp/log",
        ):
            with self.subTest(command=command):
                with self.assertRaises(ValueError):
                    parse_shell_command(command)

    def test_cat_only_allows_safe_paths(self):
        decision = classify_shell_command("cat /etc/os-release")
        self.assertEqual(decision.mode, "read")
        self.assertFalse(decision.requires_approval)

    def test_cat_rejects_unsafe_path(self):
        with self.assertRaises(ValueError):
            classify_shell_command("cat /etc/shadow")


class AgentCommandDispatchTest(unittest.TestCase):
    def test_dispatches_kubectl_command_to_kubectl_classifier(self):
        decision = classify_agent_command("kubectl get pods -A")

        self.assertEqual(decision.mode, "read")
        self.assertEqual(decision.verb, "get")

    def test_dispatches_shell_command_to_shell_classifier(self):
        decision = classify_agent_command("systemctl status kubelet")

        self.assertEqual(decision.mode, "read")
        self.assertEqual(decision.verb, "systemctl")

    def test_dispatches_write_shell_command_to_shell_classifier(self):
        decision = classify_agent_command("systemctl restart kubelet")

        self.assertEqual(decision.mode, "write")
        self.assertTrue(decision.requires_approval)

    def test_dispatches_write_kubectl_command(self):
        decision = classify_agent_command("kubectl delete pod api-0 -n prod")

        self.assertEqual(decision.mode, "write")
        self.assertTrue(decision.requires_approval)


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