"""Port-forward resolution and one-shot sandbox tools."""

import socket

import pytest
from fastmcp import Client
from fastmcp.exceptions import ToolError

from conftest import result_data, write_registry
from mcqemu.launcher import resolve_port_forwards
from mcqemu.server import mcp
from test_lifecycle import seeded_record


def test_resolve_explicit_free_port():
    assert resolve_port_forwards(["18765:22"]) == ["18765:22"]


def test_resolve_auto_picks_free_port():
    (entry,) = resolve_port_forwards(["auto:22"])
    host, guest = entry.split(":")
    assert guest == "22"
    assert 1 <= int(host) <= 65535


def test_resolve_bare_guest_port_means_auto():
    (entry,) = resolve_port_forwards(["80"])
    assert entry.endswith(":80")


def test_resolve_busy_port_fails_fast():
    with socket.socket() as blocker:
        blocker.bind(("", 0))
        busy = blocker.getsockname()[1]
        with pytest.raises(ToolError, match="already in use"):
            resolve_port_forwards([f"{busy}:22"])


def test_resolve_rejects_garbage():
    for bad in ["22->2222", "x:y", "auto:notaport", "0:0"]:
        with pytest.raises(ToolError):
            resolve_port_forwards([bad])


@pytest.fixture
def base_image(tmp_path):
    """A real minimal qcow2 to serve as sandbox base."""
    import subprocess

    path = tmp_path / "base.qcow2"
    subprocess.run(
        ["qemu-img", "create", "-f", "qcow2", str(path), "256M"],
        check=True,
        capture_output=True,
    )
    return path


@pytest.fixture
def fake_launch(dirs, monkeypatch):
    """Replace the real spawn with one that registers a plausible record."""

    async def fake_launch_vm(name, disks, memory_mb, cpus, port_forwards, ctx, **kwargs):
        from mcqemu.launcher import resolve_port_forwards
        from mcqemu.tools._common import app

        state = app(ctx)
        record = seeded_record(
            dirs, name, accel="kvm", config={"disks": disks, "port_forwards": port_forwards}
        )
        state.registry.add(record)
        return {
            "name": name,
            "status": "running",
            "accel": "kvm",
            "port_forwards": resolve_port_forwards(port_forwards),
            "restrict_net": kwargs.get("restrict_net"),
        }

    monkeypatch.setattr("mcqemu.tools.sandbox.launch_vm", fake_launch_vm)


@pytest.fixture
def agent_up(monkeypatch):
    async def responding(record):
        return True

    monkeypatch.setattr("mcqemu.tools.sandbox._agent_responding", responding)


async def test_sandbox_vm_creates_overlay_and_waits(dirs, base_image, fake_launch, agent_up):
    async with Client(mcp) as client:
        data = result_data(await client.call_tool("sandbox_vm", {"base_image": str(base_image)}))
    assert data["name"] == "sandbox"
    assert data["sandbox"] is True
    assert data["guest_agent"] == "responding"
    assert data["port_forwards"][0].endswith(":22")
    overlay = dirs.state / "vms" / "sandbox" / "overlay.qcow2"
    assert overlay.exists()
    assert data["overlay"] == str(overlay)


async def test_sandbox_auto_names_avoid_live_collisions(
    dirs, base_image, fake_launch, agent_up, all_pids_alive
):
    write_registry(dirs, seeded_record(dirs, "sandbox"))
    async with Client(mcp) as client:
        data = result_data(await client.call_tool("sandbox_vm", {"base_image": str(base_image)}))
    assert data["name"] == "sandbox-2"


async def test_sandbox_auto_name_reuses_dead(
    dirs, base_image, fake_launch, agent_up, all_pids_dead
):
    write_registry(dirs, seeded_record(dirs, "sandbox"))
    async with Client(mcp) as client:
        data = result_data(await client.call_tool("sandbox_vm", {"base_image": str(base_image)}))
    assert data["name"] == "sandbox"


async def test_sandbox_agent_timeout_reports_hint(dirs, base_image, fake_launch, monkeypatch):
    async def never(record):
        return False

    monkeypatch.setattr("mcqemu.tools.sandbox._agent_responding", never)
    async with Client(mcp) as client:
        data = result_data(
            await client.call_tool("sandbox_vm", {"base_image": str(base_image), "wait_agent_s": 0})
        )
    assert data["guest_agent"] == "unavailable"
    assert "qemu-guest-agent" in data["agent_hint"]


async def test_sandbox_destroy_removes_overlay(dirs, all_pids_dead):
    overlay = dirs.state / "vms" / "sb" / "overlay.qcow2"
    overlay.parent.mkdir(parents=True)
    overlay.write_bytes(b"fake")
    write_registry(
        dirs,
        seeded_record(
            dirs, "sb", config={"disks": [str(overlay)], "sandbox_overlay": str(overlay)}
        ),
    )
    async with Client(mcp) as client:
        data = result_data(await client.call_tool("sandbox_destroy", {"name": "sb"}))
        assert data["destroyed"] is True
        assert data["overlay_deleted"] is True
        assert not overlay.exists()
        result = result_data(await client.call_tool("list_vms", {}))
        assert result["vms"] == []


async def test_sandbox_destroy_refuses_non_sandbox(dirs, all_pids_dead):
    write_registry(dirs, seeded_record(dirs, "vm1"))
    async with Client(mcp) as client:
        with pytest.raises(ToolError, match="not created by sandbox_vm"):
            await client.call_tool("sandbox_destroy", {"name": "vm1"})