"""Regression coverage for stdio inline-handler failures (#112816).

``entry.main()`` used to call ``dispatch(req)`` bare, so an exception from an
inline (non-pool) handler unwound the read loop and killed the gateway child,
losing the in-flight reply and wedging the TUI until a restart.
"""

from __future__ import annotations

import io
import json

from tui_gateway import entry


def test_main_reports_inline_handler_error_and_keeps_reading(monkeypatch):
    """A failed inline request must not prevent the next request from replying."""
    replies: list[dict] = []
    breadcrumbs: list[str] = []
    stdin_text = "".join(json.dumps(req) + "\n" for req in (
        {"jsonrpc": "2.0", "id": "broken", "method": "clipboard.save"},
        {"jsonrpc": "2.0", "id": "next", "method": "ping"},
    ))

    monkeypatch.setattr(entry, "_install_sidecar_publisher", lambda: None)
    monkeypatch.setattr(entry, "ensure_mcp_discovery_started", lambda: None)
    monkeypatch.setattr(entry, "resolve_skin", lambda: "default")
    monkeypatch.setattr(entry.server, "_start_backend_heartbeat_refresher", lambda: None)
    monkeypatch.setattr(entry.server, "_schedule_startup_orphan_sweep", lambda: None)
    monkeypatch.setattr(entry.server, "_ensure_skin_watcher", lambda: None)
    monkeypatch.setattr(entry, "handle_spurious_eof", lambda *_args: False)
    monkeypatch.setattr(entry, "write_json", lambda payload: replies.append(payload) or True)
    monkeypatch.setattr(entry, "_append_crash_log", lambda header, dump=None: breadcrumbs.append(header))
    monkeypatch.setattr(entry.sys, "stdin", io.StringIO(stdin_text))

    def dispatch(req):
        if req["id"] == "broken":
            raise NameError("clipboard backend is unavailable")
        return {"jsonrpc": "2.0", "id": req["id"], "result": {"ok": True}}

    monkeypatch.setattr(entry, "dispatch", dispatch)

    entry.main()

    assert replies[1]["id"] == "broken"
    assert replies[1]["error"]["code"] == -32000
    assert "clipboard backend is unavailable" in replies[1]["error"]["message"]
    assert replies[2] == {"jsonrpc": "2.0", "id": "next", "result": {"ok": True}}
    # Forensics: the survived crash leaves the same crash-log trail a fatal one would.
    assert len(breadcrumbs) == 1 and "clipboard.save" in breadcrumbs[0]