#!/usr/bin/env python3
"""Full-stack TX smoke test: localhost mock-hub → WS → agent → real Pluto.

Same radio output as ``pluto_tx_smoke.py`` (continuous tone at 2 450.1 MHz),
but drives the agent through the *real* WebSocket path instead of calling
handlers in-process. Proves that the hub-driven path behaves identically:

    mock hub  ── ws:// ──▶  WsClient.run()  ──▶  Streamer.on_message
                                             └▶  Streamer.on_binary
                                                        │
                                                        ▼
                                                    real Pluto

This is the most rigorous check short of pointing the real ``ria-agent stream``
at a live ria-hub. If a tone appears on the spectrum analyzer here but *not*
when ria-hub drives it, the fault is above the WS decoder (registration,
capability gate, TX operator, hub's binary-frame publisher); everything
downstream of ``ws.recv()`` is this script's code path.

Usage::

    python3 scripts/pluto_tx_ws_smoke.py                       # default 30s tone
    python3 scripts/pluto_tx_ws_smoke.py --identifier 192.168.3.1
    python3 scripts/pluto_tx_ws_smoke.py --duration 0          # until Ctrl-C
"""

from __future__ import annotations

import argparse
import asyncio
import json
import logging
import signal
import sys

import numpy as np
import websockets

from ria_toolkit_oss.agent.config import AgentConfig
from ria_toolkit_oss.agent.streamer import Streamer
from ria_toolkit_oss.agent.ws_client import WsClient


def _make_iq_frame(buffer_size: int, tone_hz: float, sample_rate: float, phase_offset: float) -> tuple[bytes, float]:
    n = np.arange(buffer_size, dtype=np.float64)
    phase = 2.0 * np.pi * tone_hz / sample_rate * n + phase_offset
    amp = 0.7
    iq = (amp * (np.cos(phase) + 1j * np.sin(phase))).astype(np.complex64)
    interleaved = np.empty(buffer_size * 2, dtype=np.float32)
    interleaved[0::2] = iq.real
    interleaved[1::2] = iq.imag
    next_phase = (2.0 * np.pi * tone_hz / sample_rate * buffer_size + phase_offset) % (2.0 * np.pi)
    return interleaved.tobytes(), next_phase


def _make_pluto_factory(identifier: str | None):
    def factory(device: str, _ident: str | None):
        if device != "pluto":
            raise ValueError(f"this script only drives pluto; got device={device!r}")
        from ria_toolkit_oss.sdr.pluto import Pluto

        return Pluto(identifier=identifier)

    return factory


async def _mock_hub_handler(ws, args, stop: asyncio.Event):
    """Server side of the WS. Sends tx_start, streams IQ, then tx_stop."""
    # Drain the first heartbeat so the log is clean; we don't need to gate on
    # it for a localhost smoke test.
    try:
        first = await asyncio.wait_for(ws.recv(), timeout=2.0)
        if isinstance(first, str):
            payload = json.loads(first)
            if payload.get("type") == "heartbeat":
                caps = payload.get("capabilities")
                print(f"[mock-hub] agent heartbeat: capabilities={caps} " f"tx_enabled={payload.get('tx_enabled')}")
    except asyncio.TimeoutError:
        print("[mock-hub] warning: no heartbeat received in first 2s")

    # Arm the agent's TX path.
    await ws.send(
        json.dumps(
            {
                "type": "tx_start",
                "app_id": "ws-smoke",
                "radio_config": {
                    "device": "pluto",
                    "identifier": args.identifier,
                    "tx_sample_rate": int(args.sample_rate),
                    "tx_center_frequency": int(args.frequency),
                    "tx_gain": int(args.gain),
                    "buffer_size": int(args.buffer_size),
                    "underrun_policy": "repeat",
                },
            }
        )
    )
    print(f"[mock-hub] sent tx_start at {args.frequency/1e6:.3f} MHz, " f"gain={args.gain} dB")

    # Producer: push IQ frames at a steady clip. Use a concurrent receiver so
    # tx_status frames show up in real time rather than being queued behind
    # the sends.
    phase = 0.0
    buffer_dt = args.buffer_size / args.sample_rate

    async def receiver():
        try:
            while True:
                msg = await ws.recv()
                if isinstance(msg, str):
                    print(f"[mock-hub] ← {msg}")
        except (websockets.ConnectionClosed, asyncio.CancelledError):
            pass

    recv_task = asyncio.create_task(receiver())
    try:
        deadline = None if args.duration <= 0 else (asyncio.get_event_loop().time() + args.duration)
        while not stop.is_set():
            if deadline is not None and asyncio.get_event_loop().time() >= deadline:
                break
            frame, phase = _make_iq_frame(args.buffer_size, args.tone, args.sample_rate, phase)
            try:
                await ws.send(frame)
            except websockets.ConnectionClosed:
                break
            # Slightly ahead of real-time; WS backpressure handles the rest.
            await asyncio.sleep(buffer_dt * 0.5)
    finally:
        try:
            await ws.send(json.dumps({"type": "tx_stop", "app_id": "ws-smoke"}))
            print("[mock-hub] sent tx_stop")
        except websockets.ConnectionClosed:
            pass
        # Give the agent a moment to emit `tx_status: done` before we tear down.
        await asyncio.sleep(0.3)
        recv_task.cancel()
        try:
            await recv_task
        except (asyncio.CancelledError, Exception):
            pass


async def _run(args: argparse.Namespace) -> int:
    stop = asyncio.Event()
    loop = asyncio.get_running_loop()
    for sig in (signal.SIGINT, signal.SIGTERM):
        try:
            loop.add_signal_handler(sig, stop.set)
        except NotImplementedError:
            pass

    # Start the mock hub on a local port.
    async def handler(ws):
        try:
            await _mock_hub_handler(ws, args, stop)
        finally:
            stop.set()

    server = await websockets.serve(handler, "127.0.0.1", 0)
    port = server.sockets[0].getsockname()[1]
    print(f"[mock-hub] listening on ws://127.0.0.1:{port}")

    # Run the agent — exactly as ``ria-agent stream`` would, just with a
    # different URL and an in-memory AgentConfig instead of one loaded from
    # ``~/.ria/agent.json``.
    client = WsClient(
        f"ws://127.0.0.1:{port}",
        token="",
        heartbeat_interval=5.0,
        reconnect_pause=0.5,
    )
    streamer = Streamer(
        ws=client,
        sdr_factory=_make_pluto_factory(args.identifier),
        cfg=AgentConfig(tx_enabled=True, tx_max_gain_db=0.0),
    )
    client_task = asyncio.create_task(
        client.run(
            on_message=streamer.on_message,
            heartbeat=streamer.build_heartbeat,
            on_binary=streamer.on_binary,
        )
    )

    try:
        await stop.wait()
    finally:
        client.stop()
        client_task.cancel()
        try:
            await client_task
        except (asyncio.CancelledError, Exception):
            pass
        server.close()
        await server.wait_closed()

    print("Done.")
    return 0


def main() -> int:
    p = argparse.ArgumentParser(
        description="Full-stack TX smoke: localhost mock-hub → WS → agent → Pluto.",
    )
    p.add_argument("--identifier", default=None, help="Pluto IP/hostname (default: auto-discover pluto.local)")
    p.add_argument("--frequency", type=float, default=2_450_000_000.0, help="TX LO in Hz (default 2.45 GHz)")
    p.add_argument("--gain", type=float, default=0.0, help="TX gain in dB; Pluto range [-89, 0] (default 0)")
    p.add_argument("--sample-rate", type=float, default=1_000_000.0, help="Baseband sample rate (default 1 Msps)")
    p.add_argument("--tone", type=float, default=100_000.0, help="Baseband tone offset in Hz (default 100 kHz)")
    p.add_argument("--buffer-size", type=int, default=4096, help="Complex samples per frame (default 4096)")
    p.add_argument(
        "--duration", type=float, default=30.0, help="Seconds to transmit; 0 = run until Ctrl-C (default 30)"
    )
    p.add_argument("--log-level", default="INFO")
    args = p.parse_args()

    logging.basicConfig(
        level=getattr(logging, args.log_level.upper(), logging.INFO),
        format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
    )

    try:
        return asyncio.run(_run(args))
    except KeyboardInterrupt:
        return 130


if __name__ == "__main__":
    sys.exit(main())