import sys
import time

sys.path.append('freedata-server')

import unittest
import unittest.mock
from config import CONFIG
import helpers
import queue
import threading
import base64
from command_arq_raw import ARQRawCommand
from state_manager import StateManager
from frame_dispatcher import DISPATCHER
import random
import structlog
import numpy as np
from event_manager import EventManager
from state_manager import StateManager
from data_frame_factory import DataFrameFactory
import codec2
import arq_session_irs
from server import enqueue_tx_command
import command_message_send


class TestModem:
    def __init__(self, event_q, state_q):
        self.data_queue_received = queue.Queue()
        self.demodulator = unittest.mock.Mock()
        self.event_manager = EventManager([event_q])
        self.logger = structlog.get_logger('Modem')
        self.states = StateManager(state_q)

    def getFrameTransmissionTime(self, mode):
        samples = 0
        c2instance = codec2.open_instance(mode.value)
        samples += codec2.api.freedv_get_n_tx_preamble_modem_samples(c2instance)
        samples += codec2.api.freedv_get_n_tx_modem_samples(c2instance)
        samples += codec2.api.freedv_get_n_tx_postamble_modem_samples(c2instance)
        time = samples / 8000
        return time

    def transmit(self, mode, repeats: int, repeat_delay: int, frames: bytearray) -> bool:
        # Simulate transmission time
        tx_time = self.getFrameTransmissionTime(mode) + 0.1  # PTT
        self.logger.info(f"TX {tx_time} seconds...")
        threading.Event().wait(tx_time)

        transmission = {
            'mode': mode,
            'bytes': frames,
        }
        self.data_queue_received.put(transmission)


class TestMessageProtocol(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        config_manager = CONFIG('freedata-server/config.ini.example')
        cls.config = config_manager.read()
        cls.logger = structlog.get_logger("TESTS")
        cls.frame_factory = DataFrameFactory(cls.config)

        # ISS
        cls.iss_state_manager = StateManager(queue.Queue())
        cls.iss_event_manager = EventManager([queue.Queue()])
        cls.iss_event_queue = queue.Queue()
        cls.iss_state_queue = queue.Queue()
        cls.iss_modem = TestModem(cls.iss_event_queue, cls.iss_state_queue)
        cls.iss_frame_dispatcher = DISPATCHER(cls.config,
                                              cls.iss_event_manager,
                                              cls.iss_state_manager,
                                              cls.iss_modem)

        # IRS
        cls.irs_state_manager = StateManager(queue.Queue())
        cls.irs_event_manager = EventManager([queue.Queue()])
        cls.irs_event_queue = queue.Queue()
        cls.irs_state_queue = queue.Queue()
        cls.irs_modem = TestModem(cls.irs_event_queue, cls.irs_state_queue)
        cls.irs_frame_dispatcher = DISPATCHER(cls.config,
                                              cls.irs_event_manager,
                                              cls.irs_state_manager,
                                              cls.irs_modem)

        # Frame loss probability in %
        cls.loss_probability = 30

        cls.channels_running = True

    def channelWorker(self, modem_transmit_queue: queue.Queue, frame_dispatcher: DISPATCHER):
        while self.channels_running:
            # Transfer data between both parties
            try:
                transmission = modem_transmit_queue.get(timeout=1)
                transmission["bytes"] += bytes(2)  # simulate 2 bytes crc checksum
                if random.randint(0, 100) < self.loss_probability:
                    self.logger.info(f"[{threading.current_thread().name}] Frame lost...")
                    continue

                frame_bytes = transmission['bytes']
                if len(frame_bytes) == 5:
                    mode_name = "SIGNALLING_ACK"
                else:
                    mode_name = None
                frame_dispatcher.process_data(frame_bytes, None, len(frame_bytes), 0, 0, mode_name=mode_name)
            except queue.Empty:
                continue
        self.logger.info(f"[{threading.current_thread().name}] Channel closed.")

    def waitForSession(self, q, outbound=False):
        key = 'arq-transfer-outbound' if outbound else 'arq-transfer-inbound'
        while True and self.channels_running:
            ev = q.get()
            if key in ev and ('success' in ev[key] or 'ABORTED' in ev[key]):
                self.logger.info(f"[{threading.current_thread().name}] {key} session ended.")
                break

    def establishChannels(self):
        self.channels_running = True
        self.iss_to_irs_channel = threading.Thread(target=self.channelWorker,
                                                   args=[self.iss_modem.data_queue_received,
                                                         self.irs_frame_dispatcher],
                                                   name="ISS to IRS channel")
        self.iss_to_irs_channel.start()

        self.irs_to_iss_channel = threading.Thread(target=self.channelWorker,
                                                   args=[self.irs_modem.data_queue_received,
                                                         self.iss_frame_dispatcher],
                                                   name="IRS to ISS channel")
        self.irs_to_iss_channel.start()

    def waitAndCloseChannels(self):
        self.waitForSession(self.iss_event_queue, True)
        self.channels_running = False
        self.waitForSession(self.irs_event_queue, False)
        self.channels_running = False

    def testMessageViaSession(self):
        # set Packet Error Rate (PER) / frame loss probability
        self.loss_probability = 0

        self.establishChannels()
        params = {
            'destination': "AA1AAA-1",
            'body': 'Hello World',
        }

        cmd_class = command_message_send.SendMessageCommand
        command = cmd_class(self.config, self.iss_state_manager, self.iss_event_manager, params)
        command.run(self.iss_event_manager, self.iss_modem)

        self.waitAndCloseChannels()