"""Concurrent RX + TX sessions on the same agent — shared SDR via registry."""

from __future__ import annotations

import asyncio
import time

import numpy as np

from ria_toolkit_oss.agent.config import AgentConfig
from ria_toolkit_oss.agent.streamer import Streamer
from ria_toolkit_oss.sdr.mock import MockSDR


class FullDuplexMockSDR(MockSDR):
    """MockSDR with a recording TX path so the test can assert both directions."""

    def __init__(self, buffer_size: int):
        super().__init__(buffer_size=buffer_size)
        self.tx_produced: list[np.ndarray] = []

    def _stream_tx(self, callback):
        self._enable_tx = True
        self._tx_initialized = True
        while self._enable_tx:
            result = callback(self.rx_buffer_size)
            self.tx_produced.append(np.asarray(result).copy())
            time.sleep(0.005)


class FakeWs:
    def __init__(self):
        self.json_sent = []
        self.bytes_sent = []

    async def send_json(self, p):
        self.json_sent.append(p)

    async def send_bytes(self, b):
        self.bytes_sent.append(b)


def _iq_frame(samples: np.ndarray) -> bytes:
    interleaved = np.empty(samples.size * 2, dtype=np.float32)
    interleaved[0::2] = samples.real
    interleaved[1::2] = samples.imag
    return interleaved.tobytes()


def test_rx_and_tx_share_one_sdr_instance():
    built: list[FullDuplexMockSDR] = []

    def factory(device, identifier):
        sdr = FullDuplexMockSDR(buffer_size=16)
        built.append(sdr)
        return sdr

    async def scenario():
        ws = FakeWs()
        s = Streamer(ws=ws, sdr_factory=factory, cfg=AgentConfig(tx_enabled=True))

        # Start RX first.
        await s.on_message(
            {
                "type": "start",
                "app_id": "app-1",
                "radio_config": {"device": "mock", "buffer_size": 16},
            }
        )
        # Then start TX on the same device — should share the SDR handle.
        await s.on_message(
            {
                "type": "tx_start",
                "app_id": "app-1",
                "radio_config": {
                    "device": "mock",
                    "buffer_size": 16,
                    "tx_sample_rate": 1_000_000,
                    "tx_gain": -20,
                    "tx_center_frequency": 2.45e9,
                    "underrun_policy": "zero",
                },
            }
        )

        # Push a known TX buffer.
        marker = np.arange(16, dtype=np.complex64) + 7
        await s.on_binary(_iq_frame(marker))

        # Let both directions produce output.
        for _ in range(80):
            rx_ok = len(ws.bytes_sent) >= 2
            tx_ok = any(np.array_equal(b, marker) for b in built[0].tx_produced) if built else False
            if rx_ok and tx_ok:
                break
            await asyncio.sleep(0.01)

        # Heartbeat should show both sessions.
        hb = s.build_heartbeat()

        # Stop TX first, RX keeps running.
        await s.on_message({"type": "tx_stop", "app_id": "app-1"})
        tx_after_stop = s._tx is None
        rx_still_active = s._rx is not None

        # Now stop RX.
        await s.on_message({"type": "stop", "app_id": "app-1"})

        return ws, s, built, hb, tx_after_stop, rx_still_active

    ws, s, built, hb, tx_after_stop, rx_still_active = asyncio.run(scenario())

    # One SDR was built and shared.
    assert len(built) == 1, f"expected exactly one SDR instance, got {len(built)}"

    # Both directions produced output.
    assert len(ws.bytes_sent) >= 1, "RX produced no IQ frames"
    marker = np.arange(16, dtype=np.complex64) + 7
    assert any(
        np.array_equal(b, marker) for b in built[0].tx_produced
    ), "TX callback never saw the pushed marker buffer"

    # Heartbeat reflected both sessions while they were active.
    assert hb["sessions"]["rx"]["app_id"] == "app-1"
    assert hb["sessions"]["tx"]["app_id"] == "app-1"

    # Stopping TX does not tear down RX.
    assert tx_after_stop
    assert rx_still_active

    # After both stops, registry is empty.
    assert s._registry.refcount(("mock", None)) == 0
    assert s._rx is None
    assert s._tx is None