#!/usr/bin/env python3
import os
from authentication import Authetication
from executor import Executor
from netwrapper import NetWrapper


class Server:

    def __init__(self, sessionTimeout: int = 120, availableServer: bool = True):
        self.isAuthenticated = False
        self.sessionTimeout = sessionTimeout
        self.availableServer = availableServer
        self.executor = Executor("")
        self.auth = Authetication()

    def initServer(self):
        print("Please enter your private key passphrase")
        passphrase = input()
        self.networkInstance = NetWrapper(self.auth.loadUserPublicKeys(), self.auth.loadServerPrivateKey(passphrase),
                                          self.auth)

    def login(self, homeDir: str) -> None:
        self.isAuthenticated = True
        self.executor = Executor(homeDir + os.path.sep)

    def logout(self) -> None:
        self.networkInstance.logout()
        self.isAuthenticated = False
        self.availableServer = False
        self.executor = Executor("")

    def parseCommand(self, command: str) -> None:
        if command == "LINOK":
            self.login(self.networkInstance.homeDirectory)
            self.networkInstance.sendMessage("OK".encode('UTF-8'))
            return None
        elif command == "LINERROR":
            return None
        elif command == "ERROR":
            self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
            return None
        parsedCommand = command.split(" ")
        if len(parsedCommand) > 3:
            self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
        elif len(parsedCommand) == 1:
            self.execute(parsedCommand[0])
        elif len(parsedCommand) == 2:
            self.execute(parsedCommand[0], parsedCommand[1])
        elif len(parsedCommand) == 3:
            self.execute(parsedCommand[0], parsedCommand[1], parsedCommand[2])

    def execute(self, command: str, firstParam: str = "", secondParam: str = "") -> None:
        if self.executor.baseDir == "":
            raise Exception("Home directory must not be empty string. Did the user log in?")
        if command == "LOUT":
            if not (secondParam == "" and firstParam == ""):
                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
            else:
                self.networkInstance.sendMessage("OK".encode('UTF-8'))
                self.logout()
        elif command == "MKD":
            if secondParam != "":
                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
            else:
                self.executor.createDirectory(firstParam)
                self.networkInstance.sendMessage("OK".encode('UTF-8'))
        elif command == "RMD":
            if secondParam != "":
                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
            else:
                self.executor.removeDirectory(firstParam)
                self.networkInstance.sendMessage("OK".encode('UTF-8'))
        elif command == "GWD":
            if not (secondParam == "" and firstParam == ""):
                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
            else:
                self.networkInstance.sendMessage(self.executor.getCurrentDirectory().encode('UTF-8'))
        elif command == "CWD":
            if secondParam != "":
                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
            else:
                self.executor.setCurrentDirectory(firstParam)
                self.networkInstance.sendMessage("OK".encode('UTF-8'))
        elif command == "LST":
            if not (secondParam == "" and firstParam == ""):
                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
            else:
                self.networkInstance.sendMessage(self.executor.listCurrentDirectoryContent().encode('UTF-8'))
        elif command == "RMF":
            if secondParam != "":
                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
            else:
                self.executor.removeFileInCurrentDirectory(firstParam)
                self.networkInstance.sendMessage("OK".encode('UTF-8'))
        elif command == "UPL":
            if secondParam != "":
                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
            else:
                fileMessage = self.networkInstance.recieveMessage()
                eof = self.networkInstance.recieveMessage().decode('UTF-8')
                if eof == "EOF":
                    self.executor.putFileInCurrentDirectory(firstParam, fileMessage)
                    self.networkInstance.sendMessage("OK".encode('UTF-8'))
                else:
                    self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
        elif command == "DNL":
            if secondParam != "":
                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
            else:
                try:
                    file = self.executor.getFileInCurrentDirectory(firstParam)
                    self.networkInstance.sendMessage(file)
                    self.networkInstance.sendMessage("EOF".encode('UTF-8'))
                except Exception:
                    self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
        else:
            self.networkInstance.sendMessage("ERROR".encode('UTF-8'))

    def startServer(self):
        while True:
            try:
                message = self.networkInstance.recieveMessage().decode('UTF-8')
                self.parseCommand(message)
            except Exception as e:
                self.networkInstance.sendMessage("ERROR".encode('UTF-8'))
                print(e)