"""
Adding a group (Create Group wizard, or "add a directory" to an existing
one) fires `_reload_config()` without awaiting it (`asyncio.ensure_future`,
ui/app.py) — the request handler, and whatever browser tab triggered it,
return immediately. This is deliberate: the initial scan behind it can take
a very long time (measured at 23 minutes for a 114 GB library on a slow
disk), and none of that work belongs to the HTTP request or the WebRTC
session that happened to start it.

This test proves the scan is genuinely independent of its caller: it starts
the reload the same way the real endpoint does — schedules it and does not
await it, standing in for "the browser tab that made the call was closed" —
then does something else, and only afterwards checks that the reload
finished and the new group became available on its own.
"""

import asyncio
import base64
import os
from pathlib import Path
from unittest.mock import AsyncMock, MagicMock, patch

import meshbay_node.indexer.indexer as indexer_mod
import pytest
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric.ed25519 import Ed25519PrivateKey
from cryptography.hazmat.primitives.asymmetric.x25519 import X25519PrivateKey
from meshbay_node import ops
from meshbay_node.daemon import NodeDaemon


def _free_port() -> int:
    import socket
    with socket.socket() as s:
        s.bind(("127.0.0.1", 0))
        return s.getsockname()[1]


def _toml(data_dir, first_group_dir, second_group_id=None, second_group_dir=None) -> str:
    # data_dir MUST come before any [section] header — TOML has no notion of
    # "back to top-level" once a table is open, so a bare `key = value` line
    # placed after [node] becomes node.data_dir, not the top-level data_dir
    # load_config() actually reads. Silently falls back to the real default
    # (~/.local/share/meshbay) instead of erroring, which is exactly how this
    # test once ran a whole daemon — including _shutdown()'s unlink of
    # ui-token — against the developer's real, already-running node.
    # Forward slashes: a raw Windows path in a basic TOML string is a parse
    # error (`\U`, `\a`, ... are escape sequences). pathlib reads `/` fine.
    text = f"""
data_dir = "{Path(data_dir).as_posix()}"

[hub]
url = "http://localhost:9999"
username = "testuser"

[node]
quic_port = {_free_port()}
ui_port = {_free_port()}

[[groups]]
id = "{"a" * 32}"
name = "first"
shared_dir = "{Path(first_group_dir).as_posix()}"
visibility = "private"
"""
    if second_group_id:
        text += f"""
[[groups]]
id = "{second_group_id}"
name = "slow-new-group"
shared_dir = "{Path(second_group_dir).as_posix()}"
visibility = "private"
"""
    return text


def _mock_keystore_keys(sk_ed):
    sk_x = X25519PrivateKey.generate()
    pk_x_raw = sk_x.public_key().public_bytes(
        serialization.Encoding.Raw, serialization.PublicFormat.Raw)
    mock_keys = MagicMock()
    mock_keys.sk_ed25519 = sk_ed
    mock_keys.pk_ed25519_b64 = "test"
    mock_keys.sk_x25519 = sk_x
    mock_keys.pk_x25519_b64 = base64.b64encode(pk_x_raw).decode()
    return mock_keys


@pytest.mark.asyncio
async def test_hot_loaded_group_finishes_scanning_without_anyone_awaiting_the_reload(
        tmp_path):
    first_dir = tmp_path / "first"
    first_dir.mkdir()
    (first_dir / "readme.txt").write_bytes(b"hello")

    second_dir = tmp_path / "second"
    second_dir.mkdir()
    for i in range(3):
        (second_dir / f"file{i}.bin").write_bytes(os.urandom(64))
    second_group_id = "b" * 32

    data_dir = tmp_path / "data"
    config_path = tmp_path / "node.toml"
    config_path.write_text(_toml(data_dir, first_dir))

    from meshbay_node.config import load_config
    daemon = NodeDaemon(load_config(config_path), config_path=config_path)

    sk_node = Ed25519PrivateKey.generate()
    mock_keys = _mock_keystore_keys(sk_node)
    mock_session = MagicMock()
    mock_session.node_id = "node123"
    mock_session.user_id = "user123"
    mock_session.hub_pk_pem = sk_node.public_key().public_bytes(
        serialization.Encoding.PEM, serialization.PublicFormat.SubjectPublicKeyInfo)

    # Slow the second group's hashing down (a stand-in for a large/slow
    # library) so there is a real window in which "nobody is awaiting this"
    # actually means something, without needing a genuinely huge file.
    real_scan_file = indexer_mod._scan_file

    def slow_scan_file(root, path):
        import time
        time.sleep(0.15)
        return real_scan_file(root, path)

    with patch("meshbay_node.daemon.load_or_create_keystore", return_value=mock_keys), \
         patch("meshbay_node.daemon.HubClient") as MockHub, \
         patch.object(indexer_mod, "_scan_file", slow_scan_file):

        hub_instance = AsyncMock()
        hub_instance.startup = AsyncMock(return_value=mock_session)
        hub_instance.send_ws = AsyncMock()
        hub_instance._ws = None
        hub_instance.close = AsyncMock()
        hub_instance.__aenter__ = AsyncMock(return_value=hub_instance)
        hub_instance.__aexit__ = AsyncMock(return_value=False)
        MockHub.return_value = hub_instance

        shutdown_event = asyncio.Event()

        async def mock_maintain_ws(**kwargs):
            await shutdown_event.wait()
        hub_instance.maintain_ws = mock_maintain_ws

        async def run_daemon():
            with patch("signal.SIGINT", 2), patch("signal.SIGTERM", 15):
                try:
                    await asyncio.wait_for(daemon.run(), timeout=15)
                except (TimeoutError, Exception):
                    pass

        run_task = asyncio.create_task(run_daemon())
        try:
            for _ in range(50):
                if daemon._state.get("status") == "running":
                    break
                await asyncio.sleep(0.05)
            assert daemon._state["status"] == "running"
            assert second_group_id not in daemon._state.get("groups_ctx", {})

            # Add the second group to the config on disk, the way the wizard's
            # attach + /api/reload would leave it, then fire the reload exactly
            # as ui/app.py does: scheduled, NOT awaited.
            config_path.write_text(_toml(data_dir, first_dir,
                                         second_group_id, second_dir))
            reload_task = asyncio.ensure_future(daemon._reload_config())

            # Stand in for "the browser tab is gone": do something completely
            # unrelated to the reload, and explicitly do not await it here.
            await asyncio.sleep(0.01)
            assert second_group_id not in daemon._state.get("groups_ctx", {}), \
                "the scan (3 files x 0.15s) cannot have finished yet"

            # Only now catch up with the background work, from a place that
            # has no relationship to whatever originally triggered it.
            await asyncio.wait_for(reload_task, timeout=5)

            assert second_group_id in daemon._state["groups_ctx"], \
                "the new group must be usable once its scan finishes, " \
                "regardless of whether anything was still watching the reload"
            new_indexer = daemon._state["indexers"][second_group_id]
            assert new_indexer.index.count == 3
            assert new_indexer.progress.scanning is False
        finally:
            shutdown_event.set()
            await daemon._shutdown()
            run_task.cancel()
            try:
                await run_task
            except (asyncio.CancelledError, Exception):
                pass


@pytest.mark.asyncio
async def test_group_scoped_ops_404_until_listed_then_succeed(tmp_path):
    """
    The wizard's own sequence, reproduced against the real ops layer: attach
    a brand-new group, fire the reload the way /api/reload now does
    (ops.start_reload — scheduled, not awaited), and hit the group-scoped
    calls that come right after in the UI (add a root, init the GEK) while
    the scan is still running.

    Found live: "Attaching to node" no longer times out (ops.start_reload
    returns immediately), but the very next wizard step then failed with
    "Group not configured on this node" / "Group not hosted on this node" —
    the group is not in daemon._state["config"].groups or ["groups_ctx"]
    until _reload_config_inner() finishes, scan included, which is *after*
    ops.start_reload has already returned. This locks in both halves: the
    404 while the scan runs, and success once ops.list_groups() actually
    lists the group — the exact condition the wizard's own wait
    (platform.waitForGroupHosted, app.js) polls for.
    """
    first_dir = tmp_path / "first"
    first_dir.mkdir()
    (first_dir / "readme.txt").write_bytes(b"hello")

    second_dir = tmp_path / "second"
    second_dir.mkdir()
    for i in range(3):
        (second_dir / f"file{i}.bin").write_bytes(os.urandom(64))
    second_group_id = "c" * 32
    extra_root_dir = tmp_path / "extra_root"
    extra_root_dir.mkdir()

    data_dir = tmp_path / "data2"
    config_path = tmp_path / "node2.toml"
    config_path.write_text(_toml(data_dir, first_dir))

    from meshbay_node.config import load_config
    daemon = NodeDaemon(load_config(config_path), config_path=config_path)

    sk_node = Ed25519PrivateKey.generate()
    mock_keys = _mock_keystore_keys(sk_node)
    mock_session = MagicMock()
    mock_session.node_id = "node123"
    mock_session.user_id = "user123"
    mock_session.hub_pk_pem = sk_node.public_key().public_bytes(
        serialization.Encoding.PEM, serialization.PublicFormat.SubjectPublicKeyInfo)

    real_scan_file = indexer_mod._scan_file

    def slow_scan_file(root, path):
        import time
        time.sleep(0.15)
        return real_scan_file(root, path)

    with patch("meshbay_node.daemon.load_or_create_keystore", return_value=mock_keys), \
         patch("meshbay_node.daemon.HubClient") as MockHub, \
         patch.object(indexer_mod, "_scan_file", slow_scan_file):

        hub_instance = AsyncMock()
        hub_instance.startup = AsyncMock(return_value=mock_session)
        hub_instance.send_ws = AsyncMock()
        hub_instance._ws = None
        hub_instance.close = AsyncMock()
        hub_instance.__aenter__ = AsyncMock(return_value=hub_instance)
        hub_instance.__aexit__ = AsyncMock(return_value=False)
        MockHub.return_value = hub_instance

        shutdown_event = asyncio.Event()

        async def mock_maintain_ws(**kwargs):
            await shutdown_event.wait()
        hub_instance.maintain_ws = mock_maintain_ws

        async def run_daemon():
            with patch("signal.SIGINT", 2), patch("signal.SIGTERM", 15):
                try:
                    await asyncio.wait_for(daemon.run(), timeout=15)
                except (TimeoutError, Exception):
                    pass

        run_task = asyncio.create_task(run_daemon())
        try:
            for _ in range(50):
                if daemon._state.get("status") == "running":
                    break
                await asyncio.sleep(0.05)
            assert daemon._state["status"] == "running"

            # The same file write ops.attach_group does (a raw text append),
            # then the same fire-and-forget reload /api/reload now does.
            config_path.write_text(_toml(data_dir, first_dir,
                                         second_group_id, second_dir))
            reload_task = asyncio.ensure_future(ops.start_reload(daemon._state))

            await asyncio.sleep(0.01)
            listing = await ops.list_groups(daemon._state)
            assert second_group_id not in [g["id"] for g in listing["groups"]], \
                "the scan (3 files x 0.15s) cannot have finished this fast"

            # Exactly the wizard's next two steps, hit mid-scan.
            with pytest.raises(ops.OpError) as add_root_exc:
                await ops.add_root(daemon._state, second_group_id,
                                   str(extra_root_dir))
            assert add_root_exc.value.status == 404

            with pytest.raises(ops.OpError) as gek_exc:
                await ops.set_gek(daemon._state, second_group_id)
            assert gek_exc.value.status == 404

            # Now wait the way platform.waitForGroupHosted (app.js) does:
            # poll list_groups(), not index-status, until the group is
            # actually there.
            for _ in range(100):
                listing = await ops.list_groups(daemon._state)
                if second_group_id in [g["id"] for g in listing["groups"]]:
                    break
                await asyncio.sleep(0.05)
            else:
                pytest.fail("group never appeared in list_groups()")

            await asyncio.wait_for(reload_task, timeout=5)

            # Both calls that 404'd above must now succeed.
            add_result = await ops.add_root(daemon._state, second_group_id,
                                            str(extra_root_dir))
            assert add_result["status"] == "added"

            gek_result = await ops.set_gek(daemon._state, second_group_id)
            assert gek_result["status"] == "ok"
        finally:
            shutdown_event.set()
            await daemon._shutdown()
            run_task.cancel()
            try:
                await run_task
            except (asyncio.CancelledError, Exception):
                pass