import struct
import asyncio
from unittest.mock import AsyncMock
from pm3py.core.protocol import Cmd
from pm3py.core.transport import PM3Response
from pm3py.core.lf import LFCommands

def make_response(cmd, status, data):
    return PM3Response(cmd=cmd, status=status, reason=0, ng=True, data=data)

def test_lf_tune():
    t = AsyncMock()
    lf = LFCommands(t)
    # First call: init, second call: measure returns uint32 voltage
    t.send_ng.return_value = make_response(Cmd.MEASURE_ANTENNA_TUNING_LF, 0,
                                           struct.pack("<I", 42000))
    result = asyncio.get_event_loop().run_until_complete(lf.tune(divisor=95))
    assert result["voltage_mV"] == 42000
    # Firmware requires exactly 2-byte payloads ({1,div} init, {2,div} measure)
    calls = t.send_ng.call_args_list
    assert calls[0].args[1] == struct.pack("<BB", 1, 95)
    assert calls[1].args[1] == struct.pack("<BB", 2, 95)

def test_lf_config_get():
    t = AsyncMock()
    lf = LFCommands(t)
    payload = struct.pack("<bbbhhib", 1, 8, 1, 95, 128, 0, 0)
    t.send_ng.return_value = make_response(Cmd.LF_SAMPLING_GET_CONFIG, 0, payload)
    result = asyncio.get_event_loop().run_until_complete(lf.config())
    assert "decimation" in result
    assert "bits_per_sample" in result

def test_lf_config_set_fire_and_forget():
    t = AsyncMock()
    lf = LFCommands(t)
    payload = struct.pack("<bbbhhib", 1, 8, 1, 95, 128, 0, 0)
    t.send_ng.return_value = make_response(Cmd.LF_SAMPLING_GET_CONFIG, 0, payload)
    asyncio.get_event_loop().run_until_complete(lf.config(divisor=88))
    # Firmware never replies to SET — must be fire-and-forget
    t.send_ng_no_response.assert_awaited_once()
    assert t.send_ng_no_response.call_args.args[0] == Cmd.LF_SAMPLING_SET_CONFIG

def test_lf_t55_writebl():
    t = AsyncMock()
    lf = LFCommands(t)
    t.send_ng.return_value = make_response(Cmd.LF_T55XX_WRITEBL, 0, b"")
    asyncio.get_event_loop().run_until_complete(
        lf.t55.writebl(block=4, data=0x12345678, page=1,
                       password=0xAABBCCDD, downlink_mode=2))
    payload = t.send_ng.call_args.args[1]
    # data(4)+pwd(4)+blockno(1)+flags(1) = 10 bytes
    assert len(payload) == 10
    data, pwd, blockno, flags = struct.unpack("<IIBB", payload)
    assert data == 0x12345678
    assert pwd == 0xAABBCCDD
    assert blockno == 4
    # PwdMode(0x01) | Page(0x02) | downlink 2<<3 (0x10) = 0x13
    assert flags == 0x13

def test_lf_t55_wakeup():
    t = AsyncMock()
    lf = LFCommands(t)
    t.send_ng.return_value = make_response(Cmd.LF_T55XX_WAKEUP, 0, b"")
    asyncio.get_event_loop().run_until_complete(
        lf.t55.wakeup(password=0x11223344, downlink_mode=3))
    payload = t.send_ng.call_args.args[1]
    assert len(payload) == 5
    pwd, flags = struct.unpack("<IB", payload)
    assert pwd == 0x11223344
    assert flags == (3 << 3)

def test_lf_t55_config_client_side():
    t = AsyncMock()
    lf = LFCommands(t)
    result = asyncio.get_event_loop().run_until_complete(lf.t55.config())
    assert len(result["modes"]) == 4
    # No firmware round-trip: SET_CONFIG is write-only and never replies
    t.send_ng.assert_not_called()


def test_lf_read_uses_reader_field_acq():
    # read() must turn the reader field ON (LF_ACQ_RAW_ADC) — SNIFF is field-off and reads nothing
    t = AsyncMock()
    lf = LFCommands(t)
    t.send_ng.return_value = make_response(Cmd.LF_ACQ_RAW_ADC, 0, struct.pack("<I", 98304))
    result = asyncio.get_event_loop().run_until_complete(lf.read(samples=12288))
    assert result["samples"] == 98304
    args, kwargs = t.send_ng.call_args
    assert args[0] == Cmd.LF_ACQ_RAW_ADC
    payload = args[1] if len(args) > 1 else kwargs["payload"]
    assert len(payload) == 5                       # lf_sample_payload_t: 30+1+1 bits + cotag byte
    word = struct.unpack_from("<I", payload, 0)[0]
    assert (word & 0x3FFFFFFF) == 12288            # samples field
    assert (word >> 30) & 1 == 0                   # realtime = 0


def test_lf_sniff_uses_field_off():
    t = AsyncMock()
    lf = LFCommands(t)
    t.send_ng.return_value = make_response(Cmd.LF_SNIFF_RAW_ADC, 0, struct.pack("<I", 100))
    asyncio.get_event_loop().run_until_complete(lf.sniff(samples=4096))
    assert t.send_ng.call_args[0][0] == Cmd.LF_SNIFF_RAW_ADC