import json
import time
import argparse
import sys, signal
import gpiod
from pymodbus.client import ModbusTcpClient
# import AWSIoTPythonSDK.MQTTLib as AWSIoTPyMQTT
import sdtcloudnodeqmqtt
import pytz
from datetime import datetime
import threading, socket
import uuid

def Motor(chip, status, action):
    if action == 'On':
        status[0] = 1
    else: # action == 'Off'
        status[0] = 0
    
    chip.set_values(status)

def Valve_Vent(chip, status, action):
    if action == 'On':
        status[1] = 1
    else: # action == 'Off'
        status[1] = 0
    
    chip.set_values(status)

def Valve_MixedWater(chip, status, action):
    if action == 'On':
        status[2] = 1
    else: # action == 'Off'
        status[2] = 0
    
    chip.set_values(status)

def Valve_PureWater(chip, status, action):
    if action == 'On':
        status[3] = 1
    else: # action == 'Off'
        status[3] = 0
    
    chip.set_values(status)

def Valve_EnterWater(chip, status, action):
    if action == 'On':
        status[4] = 1
    else: # action == 'Off'
        status[4] = 0
    
    chip.set_values(status)

def Measure_Weight(client):
    # print('in')
    val = 0
    try:
        result = client.read_holding_registers(1, 1)
        if result.iserror():
            print(f'Error: {result}')
        else:
            val = result.registers[0]
            val -= 1000
            val /= 1000            
            #print(f'value: {val}')
    except Exception as e:
        pass
    
    return float(val)

def Calculate_Concentration(weight):
    global data, volume_water
    data['data']['weight'] = weight
    result = (float(weight) * volume_water * 128.5) - 126.11 # 1000 / 531 = 1.883239171
    data['data']['concentration'] = result
    # print(f'{weight}, {result}')

def Set_Zero(client):
    client.write_coil(1, 1)

def Command_Read():
    with open('./control.json', 'r') as f:
        cmd = json.load(f)

    if cmd['type'] == 'auto':
        
        Valve_Vent(chip=output_lines, status=status, action='Off')
        Motor(chip=output_lines, status=status, action='Off')
        
        mixed_duration = int(cmd['device']['mixed']['duration'])
        pure_duration = int(cmd['device']['pure']['duration'])
        pure_holding = int(cmd['device']['pure']['holding'])
        vent_duration = int(cmd['device']['vent']['duration'])
        vent_holding = int(cmd['device']['vent']['holding'])
        measure_duration = int(cmd['device']['measure']['duration'])
        enter_duration = int(cmd['device']['enter']['duration'])

        time.sleep(7)
        start = Measure_Weight(client=client)
        time.sleep(5)
        
        # input mixed water
        Valve_MixedWater(chip=output_lines, status=status, action='On')
        time.sleep(0.5)
        Valve_EnterWater(chip=output_lines, status=status, action='On')
        time.sleep(0.5)
        Valve_Vent(chip=output_lines, status=status, action='On')
        time.sleep(vent_holding)
        Valve_Vent(chip=output_lines, status=status, action='Off')
        time.sleep(mixed_duration)
        Valve_MixedWater(chip=output_lines, status=status, action='Off')
        time.sleep(0.5)
        Valve_EnterWater(chip=output_lines, status=status, action='Off')
        time.sleep(measure_duration)

        # measure weight
        end = Measure_Weight(client=client)
        time.sleep(1)
        
        Calculate_Concentration(weight=(float(end)-float(start)))

        # # vent mixed water
        # Valve_Vent(chip=output_lines, status=status, action='On')
        # time.sleep(0.5)
        # Motor(chip=output_lines, status=status, action='On')
        # time.sleep(vent_duration)
        # Motor(chip=output_lines, status=status, action='Off')
        # time.sleep(0.5)
        # Valve_Vent(chip=output_lines, status=status, action='Off')
        # time.sleep(0.5)

        # # input pure water
        # Valve_PureWater(chip=output_lines, status=status, action='On')
        # time.sleep(pure_duration)
        # Valve_PureWater(chip=output_lines, status=status, action='Off')
        # time.sleep(0.5)

        # # vent pure water
        # Valve_Vent(chip=output_lines, status=status, action='On')
        # time.sleep(0.5)
        # Motor(chip=output_lines, status=status, action='On')
        # time.sleep(vent_duration)
        # Motor(chip=output_lines, status=status, action='Off')
        # time.sleep(0.5)
        # Valve_Vent(chip=output_lines, status=status, action='Off')
        # time.sleep(1)
        
        # Vent and Clear sequence
        # 1) Motor On
        Motor(chip=output_lines, status=status, action='On')
        time.sleep(0.5)
        
        # 2) Input Pure Water
        Valve_PureWater(chip=output_lines, status=status, action='On')
        time.sleep(0.5)
        Valve_EnterWater(chip=output_lines, status=status, action='On')
        time.sleep(vent_holding)

        # 3) Open Vent
        Valve_Vent(chip=output_lines, status=status, action='On')
        time.sleep(pure_duration)

        Valve_PureWater(chip=output_lines, status=status, action='Off')
        time.sleep(0.5)
        Valve_EnterWater(chip=output_lines, status=status, action='Off')
        
        # 4) Wait until empty
        time.sleep(vent_duration)

        # 5) Motor Off and Vent close
        Motor(chip=output_lines, status=status, action='Off')
        time.sleep(0.5)
        Valve_Vent(chip=output_lines, status=status, action='Off')
        time.sleep(0.5)

        return 1
        
    else: # cmd['type'] == 'manual'
        Motor(chip=output_lines, status=status, action=cmd['device']['motor']['action'])
        Valve_Vent(chip=output_lines, status=status, action=cmd['device']['vent']['action'])
        Valve_MixedWater(chip=output_lines, status=status, action=cmd['device']['mixed']['action'])
        Valve_PureWater(chip=output_lines, status=status, action=cmd['device']['pure']['action'])
        Valve_EnterWater(chip=output_lines, status=status, action=cmd['device']['enter']['action'])
        
        if cmd['device']['measure']['action'] == 'On':
            result = Measure_Weight(client=client)
            Calculate_Concentration(result)
            return 1
            
        if cmd['device']['setzero']['action'] == 'On':
            Set_Zero(client=client)
    
    return 0

def runAction():
    # Write the app's actions in the "runAction" function.
    
    # Connect MQTT Broker
    # You have to rename client id. There are special rules.
    # Client Name: "device-app-*"
    # For Example
    # 1. device-app-test   -> Good 
    # 2. device-app-light-app   -> Good
    # 3. device-test-app -> Bad
    global data, client
    sdtcloud = sdtcloudnodeqmqtt.sdtcloudnodeqmqtt()
    mqttClient1 = sdtcloud.setClient(f"device-app-1{uuid.uuid1()}") # parameter is client ID(string)
    mqttClient2 = sdtcloud.setClient(f"device-app-2{uuid.uuid1()}") # parameter is client ID(string)
    mqttClient3 = sdtcloud.setClient(f"device-app-3{uuid.uuid1()}") # parameter is client ID(string)
    mqttClient4 = sdtcloud.setClient(f"device-app-4{uuid.uuid1()}") # parameter is client ID(string)
    mqttClient5 = sdtcloud.setClient(f"device-app-5{uuid.uuid1()}") # parameter is client ID(string)
    mqttlist = [mqttClient1, mqttClient2, mqttClient3, mqttClient4, mqttClient5]
   
    # If you have config's value, please make config.json file.
    # - Project Code's variable: projectCode(string)
    # - Asset Code's variable: assetCode(string)
    # - You may need it to create a topic.


    cnt = 0
    while True:
        start = time.time()
        result = Command_Read()
        
        if result:
            data['timestamp'] = int(time.time() * 1000)
            sdtcloud.pubMessage(mqttlist[cnt], data)
            cnt += 1
            if cnt == 5:
                cnt = 0

        end = time.time()
        
        diff = end - start
        if diff < 3:
            time.sleep(3 - diff)

def handle_client(conn, ip, port):
    global data
    while True:
        try:
            recv = conn.recv(100)
            if not recv:
                # print(f"Connection with {addr} was reset. Waiting for new connection.")
                break

            message = recv.decode().strip()
                    
            if message[:3] != 'STX' or message[-3:] != 'ETX':
                err_msg = 'STXERRORETX'
                conn.sendall(err_msg.encode("utf8"))
            else:
                if message[3] == 'R': # Transfer data from SDT to Sampyo
                    now = datetime.now(pytz.timezone('Asia/Seoul'))
                    time_str = now.strftime('%Y%m%d%H%M%S')
                    
                    h_weight = float(data['data']['weight'])
                    h_concentration = float(data['data']['concentration'])
                    data_weight = '{:.3f}'.format(h_weight)
                    data_concent = '{:.3f}'.format(h_concentration)
                    
                    send_msg = 'STX' + time_str + '|' + data_weight + '|' + data_concent + 'ETX'
                    
                    try:
                        with open('./control.json', 'r') as f:
                            cmd = json.load(f)
                        
                        cmd['device']['measure']['action'] = 'On'
                        
                        with open('./control.json', 'w') as f:
                            json.dump(cmd, f, indent=4)
                        
                        conn.sendall(send_msg.encode("utf8"))
                    except Exception as e:
                        err_msg = 'STXERRORETX'
                        conn.sendall(err_msg.encode("utf8"))
                
                elif message[3] == 'S': # Start measurement
                    try:
                        with open('./control.json', 'r') as f:
                            cmd = json.load(f)
                        
                        cmd['type'] = 'auto'
                        
                        with open('./control.json', 'w') as f:
                            json.dump(cmd, f, indent=4)
                        
                        send_msg = 'STXOKETX'
                        conn.sendall(send_msg.encode("utf8"))
                    except Exception as e:
                        err_msg = 'STXERRORETX'
                        conn.sendall(err_msg.encode("utf8"))
                        
                elif message[3] == 'T': # Stop measurement
                    try:
                        with open('./control.json', 'r') as f:
                            cmd = json.load(f)
                        
                        cmd['type'] = 'manual'
                        cmd['device']['measure']['action'] = 'Off'
                        
                        with open('./control.json', 'w') as f:
                            json.dump(cmd, f, indent=4)
                        
                        send_msg = 'STXOKETX'
                        conn.sendall(send_msg.encode("utf8"))
                    except Exception as e:
                        err_msg = 'STXERRORETX'
                        conn.sendall(err_msg.encode("utf8"))
                        
                else:
                    err_msg = 'STXERRORETX'
                    conn.sendall(err_msg.encode("utf8"))
        except ConnectionResetError:
            # print("Connection with " + ip + ":" + port + " was reset. Waiting for new connection.")
            break

    # print("Closing the connection")

def start_server(addr, port):
    host = addr # "25.7.57.1"
    port = port # 5000

    soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    soc.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    
    try:
        soc.bind((host, port))
    except:
        sys.exit()

    soc.listen(1)  # Only one connection at a time.
    
    while True:
        conn, addr = soc.accept()
        ip, port = str(addr[0]), str(addr[1])
        print("Connected with " + ip + ":" + port)

        client_handler = threading.Thread(target=handle_client, args=(conn, ip, port))
        client_handler.start()

    soc.close()
        
def exit_handler(signum, frame):
    Motor(chip=output_lines, status=status, action='Off')
    Valve_Vent(chip=output_lines, status=status, action='Off')
    Valve_MixedWater(chip=output_lines, status=status, action='Off')
    Valve_PureWater(chip=output_lines, status=status, action='Off')
    
    client.close()
    
    sys.exit(0)
        
if __name__ == "__main__":
    output_chip = gpiod.chip('gpiochip11')
    config = gpiod.line_request()
    config.consumer = 'output'
    config.request_type = gpiod.line_request.DIRECTION_OUTPUT

    output_lines = output_chip.get_lines([0, 1, 2, 3, 4, 5, 6, 7])
    output_lines.request(config, default_vals=[0, 0, 0, 0, 0, 0, 0, 0])
    
    status = [0, 0, 0, 0, 0, 0, 0, 0]
    
    signal.signal(signal.SIGINT, exit_handler)
    
    with open('./config.json', encoding='UTF-8') as f:
        jsonData = json.load(f)

    volume_water = 1000.0 / float(jsonData['volume-water']) 
    
    modbus_addr = jsonData['modbus-server']['address']
    modbus_port = jsonData['modbus-server']['port']
    
    client = ModbusTcpClient(modbus_addr, modbus_port)
    
    data = {
        "timestamp": 0,
        "data":{
            "weight": 0,
            "concentration": 0 
        }
    }
    
    ## Get ProjectCode and AssetCode
    
    ## Execution main funcion
    operation_thread = threading.Thread(target=runAction, args=())
    operation_thread.start()
    
    tcp_addr = jsonData['tcp-server']['address']
    tcp_port = jsonData['tcp-server']['port']
    ## Execution TCP/IP server
    start_server(addr=tcp_addr, port=tcp_port)