"""Contracts for bounded, screened command execution in the handoff harness."""

from __future__ import annotations

import subprocess

from testing.tests.test_hermes_handoff_support import (
    FakeClock,
    FakeSpawn,
    load_handoff_module,
)

runner_module = load_handoff_module("hermes_handoff_exec")
policy = load_handoff_module("hermes_handoff_policy")


def completed(stdout: str = "", stderr: str = "", returncode: int = 0):
    return subprocess.CompletedProcess(args=[], returncode=returncode, stdout=stdout, stderr=stderr)


def build(results: list, **kwargs) -> tuple:
    clock = FakeClock()
    spawn = FakeSpawn(results)
    runner = runner_module.Runner(clock=clock, spawn=spawn, environ={}, **kwargs)
    return (runner, spawn, clock)


OPERATOR = runner_module.operator_vantage()


def test_a_successful_command_is_captured_and_screened() -> None:
    runner, spawn, _ = build([completed(stdout="password=a-long-enough-secret\n")])

    outcome = runner.run(("kubectl", "get", "pods"), OPERATOR)

    assert outcome.ok and outcome.ran
    assert "[redacted]" in outcome.stdout
    assert outcome.returncode == 0
    assert spawn.calls[0]["argv"] == ["kubectl", "get", "pods"]
    assert runner.commands_run == 1


def test_a_failing_command_is_not_ok_but_still_ran() -> None:
    runner, _, _ = build([completed(stderr="Error from server (Forbidden)", returncode=1)])

    outcome = runner.run(("kubectl", "get", "pods"), OPERATOR)

    assert outcome.ran and not outcome.ok
    assert "Forbidden" in outcome.combined


def test_a_policy_violation_never_reaches_a_subprocess() -> None:
    runner, spawn, _ = build([])

    outcome = runner.run(("kubectl", "delete", "pods", "--all"), OPERATOR)

    assert outcome.error and outcome.error.startswith("policy:")
    assert not outcome.ran
    assert spawn.calls == []
    assert runner.commands_run == 0


def test_a_timeout_is_recorded_rather_than_raised() -> None:
    runner, _, _ = build([subprocess.TimeoutExpired(cmd="kubectl", timeout=1.0)])

    outcome = runner.run(("kubectl", "get", "pods"), OPERATOR)

    assert outcome.error == runner_module.TIMEOUT_ERROR
    assert not outcome.ran


def test_a_missing_binary_is_recorded_rather_than_raised() -> None:
    runner, _, _ = build([FileNotFoundError(2, "No such file or directory")])

    outcome = runner.run(("kubectl", "get", "pods"), OPERATOR)

    assert outcome.error and outcome.error.startswith("spawn:")


def test_the_run_deadline_stops_further_probes_without_spawning() -> None:
    runner, spawn, clock = build([completed(stdout="first")], deadline_seconds=10.0)

    assert runner.run(("kubectl", "get", "pods"), OPERATOR).ok
    clock.advance(11.0)
    second = runner.run(("kubectl", "get", "nodes"), OPERATOR)

    assert second.error == runner_module.DEADLINE_ERROR
    assert len(spawn.calls) == 1
    assert runner.remaining_seconds < 0


def test_the_command_timeout_is_clamped_by_the_remaining_deadline() -> None:
    runner, spawn, clock = build([completed()], command_timeout=30.0, deadline_seconds=10.0)
    clock.advance(6.0)

    runner.run(("kubectl", "get", "pods"), OPERATOR)

    assert spawn.calls[0]["timeout"] == 4.0


def test_output_is_bounded_per_command_and_can_be_raised_per_call() -> None:
    runner, _, _ = build([completed(stdout="y" * 200), completed(stdout="y" * 200)], max_bytes=50)

    small = runner.run(("kubectl", "get", "pods"), OPERATOR)
    large = runner.run(("kubectl", "get", "pods"), OPERATOR, max_bytes=4096)

    assert small.truncated
    assert not large.truncated


def test_the_child_environment_is_rebuilt_from_an_allowlist() -> None:
    source = {"PATH": "/bin", "KUBECONFIG": "/tmp/kc", "ANTHROPIC_API_KEY": "leak", "HOME": "/root"}
    environment = runner_module.build_environment(OPERATOR, source)

    assert environment == {"PATH": "/bin", "KUBECONFIG": "/tmp/kc", "HOME": "/root", "LC_ALL": "C"}
    assert "ANTHROPIC_API_KEY" not in environment


def test_a_vantage_can_override_the_environment_it_needs() -> None:
    vantage = runner_module.operator_vantage(kubeconfig="/tmp/operator.yaml")
    environment = runner_module.build_environment(vantage, {"KUBECONFIG": "/tmp/other"})

    assert environment["KUBECONFIG"] == "/tmp/operator.yaml"
    assert "kubeconfig-pinned" in vantage.description


def test_the_operator_context_is_inserted_only_for_context_aware_tools() -> None:
    vantage = runner_module.operator_vantage(context="atlas-operator")

    assert vantage.wrap(("kubectl", "get", "pods"))[:3] == ("kubectl", "--context", "atlas-operator")
    assert vantage.wrap(("git", "status")) == ("git", "status")
    assert vantage.wrap(()) == ()


def test_the_pod_vantage_execs_into_the_container_and_drops_the_context() -> None:
    operator = runner_module.operator_vantage(context="atlas-operator")
    vantage = runner_module.pod_vantage("hermes", "hermes-agent-1", "hermes", operator)

    wrapped = vantage.wrap(("kubectl", "get", "pods"))

    assert wrapped[:3] == ("kubectl", "--context", "atlas-operator")
    assert wrapped[3] == "exec"
    assert wrapped[-4:] == ("--", "kubectl", "get", "pods")
    assert vantage.description == "in-pod hermes/hermes-agent-1[hermes]"
    policy.check_argv(wrapped)


def test_a_pod_vantage_without_an_operator_still_addresses_the_pod() -> None:
    vantage = runner_module.pod_vantage("hermes", "pod-a", "hermes")

    assert vantage.wrap(("kubectl", "version"))[0] == "kubectl"
    assert vantage.env == {}


def test_outcome_serialisation_screens_the_command_line() -> None:
    outcome = runner_module.Outcome(
        argv=("git", "clone", "https://user:a-long-enough-secret@scm.example.dev/x"),
        vantage="operator",
        returncode=0,
        stdout="ok",
    )

    payload = outcome.as_dict()

    assert "a-long-enough-secret" not in payload["command"]
    assert payload["vantage"] == "operator"
    assert payload["stdout"] == "ok"


def test_combined_output_joins_only_the_streams_that_carry_text() -> None:
    assert runner_module.Outcome(argv=(), vantage="x", stdout="a", stderr="b").combined == "a\nb"
    assert runner_module.Outcome(argv=(), vantage="x", stdout="a").combined == "a"
    assert runner_module.Outcome(argv=(), vantage="x").combined == ""