'''
@author: Daniel Suarez
'''
import os
import glob
import ftplib

try:
    import paramiko
    import scp
except:
    print "You should install paramiko if you will use SSH protocol to upload files to a server"

import multiprocessing

import time
import threading


try:
    from gevent import sleep
except:
    from time import sleep
    
from schainpy.model.proc.jroproc_base import ProcessingUnit, Operation

class Remote(threading.Thread):
    """
    Remote is a parent class used to define the behaviour of FTP and SSH class. These clases are
    used to upload or download files remotely.
    
    Non-standard Python modules used:
        None
    
    Written by:
    
        "Miguel Urco":mailto:miguel.urco@jro.igp.gob.pe  Jun. 03, 2015
        
    """
    
    server = None
    username = None
    password = None
    remotefolder = None
    
    period = 60
    fileList = []
    bussy = False
        
    def __init__(self, server, username, password, remotefolder, period=60):
        
        threading.Thread.__init__(self)
        self._stop = threading.Event()
        
        self.status = 0

        self.period = period
        self.fileList = []
        self.bussy = False
        
        self.stopFlag = False
        
        print "[Remote Server] Opening server: %s" %server
        if self.open(server, username, password, remotefolder):
            print "[Remote Server] %s server was opened successfully" %server

    def stop(self):
        
        self.stopFlag = True
    
    def open(self):
        """
        Connect to server and create a connection class (FTP or SSH) to remote server.
        """
        raise NotImplementedError, "Implement this method in child class"
    
    def close(self):
        """
        Close connection to server
        """
        raise NotImplementedError, "Implement this method in child class"
    
    def mkdir(self, remotefolder):
        """
        Create a folder remotely
        """
        raise NotImplementedError, "Implement this method in child class"
    
    def cd(self, remotefolder):
        """
        Change working directory in remote server
        """
        raise NotImplementedError, "Implement this method in child class"
    
    def download(self, filename, localfolder=None):
        """
        Download a file from server to local host
        """
        raise NotImplementedError, "Implement this method in child class"
    
    def sendFile(self, fullfilename):
        """
        sendFile method is used to upload a local file to the current directory in remote server
        
        Inputs:
            fullfilename        - full path name of local file to store in remote directory
            
        Returns:
            0 in error case else 1
        """
        raise NotImplementedError, "Implement this method in child class"
    
    def upload(self, fullfilename, remotefolder=None):        
        """
        upload method is used to upload a local file to remote directory. This method changes
        working directory before sending a file.
        
        Inputs:
            fullfilename        - full path name of local file to store in remote directory
            
            remotefolder    - remote directory 
            
        Returns:
            0 in error case else 1
        """
        print "[Remote Server] Uploading %s to %s:%s" %(fullfilename, self.server, self.remotefolder)
        
        if not self.status:
            return 0
        
        if remotefolder == None:
            remotefolder = self.remotefolder
        
        if not self.cd(remotefolder):
            return 0
        
        if not self.sendFile(fullfilename):
            print "[Remote Server] Error uploading file %s" %fullfilename
            return 0
        
        print "[Remote Server] upload finished successfully"
        
        return 1
    
    def delete(self, filename):
        """
        Remove a file from remote server
        """
        pass
    
    def updateFileList(self, fileList):
        """
        Remove a file from remote server
        """
        
        if fileList == self.fileList:
            return 1
        
        init = time.time()
        
        while(self.bussy):
            sleep(0.1)
            if time.time() - init > 2*self.period:
                return 0
        
        self.fileList = fileList
        
        return 1
        
    def run(self):
        
        if not self.cd(self.remotefolder):
            raise ValueError, "Could not access to the new remote directory: %s" %self.remotefolder
        
        while True:
            
            sleep(self.period)
            
            self.bussy = True
            
            for thisFile in self.fileList:
                self.upload(thisFile, self.remotefolder)
            
            self.bussy = False
            
            if self.stopFlag:
                break
            
        print "[Remote Server] Thread stopped successfully"
            
class FTPClient(Remote):
    
    __ftpClientObj = None
    
    def __init__(self, server, username, password, remotefolder, period=60):
        """
        """
        Remote.__init__(self, server, username, password, remotefolder, period)
        
    def open(self, server, username, password, remotefolder):
        
        """
        This method is used to set FTP parameters and establish a connection to remote server
        
        Inputs:
            server    - remote server IP Address 
            
            username    - remote server Username 
            
            password    - remote server password
            
            remotefolder    - remote server current working directory
        
        Return: void
        
        Affects: 
            self.status        - in case of error or fail connection this parameter is set to 0 else 1

        """
              
        if server == None:
            raise ValueError, "FTP server should be defined"
        
        if username == None:
            raise ValueError, "FTP username should be defined"
        
        if password == None:
            raise ValueError, "FTP password should be defined"
        
        if remotefolder == None:
            raise ValueError, "FTP remote folder should be defined"
        
        try:
            ftpClientObj = ftplib.FTP(server)
        except ftplib.all_errors:
            print "FTP server connection fail: %s" %server
            self.status = 0
            return 0
        
        try:
            ftpClientObj.login(username, password)
        except ftplib.all_errors:
            print "FTP username or password are incorrect"
            self.status = 0
            return 0
        
        if remotefolder == None:
            remotefolder = ftpClientObj.pwd()
        else:
            try:
                ftpClientObj.cwd(remotefolder)
            except ftplib.all_errors:
                print "FTP remote folder is invalid: %s" %remotefolder
                remotefolder = ftpClientObj.pwd()
                
        self.server = server
        self.username = username
        self.password = password
        self.remotefolder = remotefolder
        self.__ftpClientObj = ftpClientObj
        self.status = 1
        
        return 1
    
    def close(self):
        """
        Close connection to remote server
        """
        if not self.status:
            return 0
        
        self.__ftpClientObj.close()
        
    def mkdir(self, remotefolder):
        """
        mkdir is used to make a new directory in remote server
        
        Input:
            remotefolder    - directory name
        
        Return:
            0 in error case else 1
        """
        if not self.status:
            return 0
        
        try:
            self.__ftpClientObj.mkd(dirname)
        except ftplib.all_errors:
            print "Error creating remote folder: %s" %remotefolder
            return 0
        
        return 1
    
    def cd(self, remotefolder):
        """
        cd is used to change remote working directory on server
        
        Input:
            remotefolder    - current working directory
            
        Affects:
            self.remotefolder
        
        Return: 
            0 in case of error else 1
        """
        if not self.status:
            return 0
        
        if remotefolder == self.remotefolder:
            return 1
        
        try:        
            self.__ftpClientObj.cwd(remotefolder)        
        except ftplib.all_errors:
            print 'Error changing to %s' %remotefolder
            print 'Trying to create remote folder'
            
            if not self.mkdir(remotefolder):
                print 'Remote folder could not be created'
                return 0
            
            try:        
                self.__ftpClientObj.cwd(remotefolder) 
            except ftplib.all_errors:
                return 0
            
        self.remotefolder = remotefolder
        
        return 1
    
    def sendFile(self, fullfilename):

        if not self.status:
            return 0
        
        file = open(fullfilename, 'rb')
        
        filename = os.path.split(fullfilename)[-1]
        
        command = "STOR %s" %filename
        
        try:
            self.__ftpClientObj.storbinary(command, file)
        except ftplib.all_errors:
            return 0
        
        try:
            self.__ftpClientObj.sendcmd('SITE CHMOD 755 ' + filename)
        except ftplib.all_errors, e:
            print e
        
        file.close()
        
        return 1

class SSHClient(Remote):
    
    __sshClientObj = None
    __scpClientObj = None
    
    def __init__(self, server, username, password, remotefolder, period=60):
        """
        """
        Remote.__init__(self, server, username, password, remotefolder, period)
        
    def open(self, server, username, password, remotefolder, port=22):
        
        """
        This method is used to set SSH parameters and establish a connection to a remote server
        
        Inputs:
            server    - remote server IP Address 
            
            username    - remote server Username 
            
            password    - remote server password
            
            remotefolder    - remote server current working directory
        
        Return: void
        
        Affects: 
            self.status        - in case of error or fail connection this parameter is set to 0 else 1

        """
              
        if server == None:
            raise ValueError, "SSH server should be defined"
        
        if username == None:
            raise ValueError, "SSH username should be defined"
        
        if password == None:
            raise ValueError, "SSH password should be defined"
        
        if remotefolder == None:
            raise ValueError, "SSH remote folder should be defined"
        
        try:
            sshClientObj = paramiko.SSHClient()
        except:
            print "SSH server connection fail: %s" %server
            self.status = 0
            return 0
            
        sshClientObj.load_system_host_keys()
        sshClientObj.set_missing_host_key_policy(paramiko.WarningPolicy())
        
        try:
            sshClientObj.connect(server, username=username, password=password, port=port) 
        except :
            print "SSH username or password are incorrect: %s"
            self.status = 0
            return 0
        
        scpClientObj = scp.SCPClient(sshClientObj.get_transport(), socket_timeout=30)
        
        if remotefolder == None:
            remotefolder = self.pwd()
        
        self.server = server
        self.username = username
        self.password = password
        self.__sshClientObj = sshClientObj
        self.__scpClientObj = scpClientObj
        self.status = 1
        
        if not self.cd(remotefolder):
            raise ValueError, "Could not access to remote folder: %s" %remotefolder
            return 0
        
        self.remotefolder = remotefolder
                
        return 1
    
    def close(self):
        """
        Close connection to remote server
        """
        if not self.status:
            return 0
        
        self.__sshObj.close()

    def __execute(self, command):
        """
        __execute a command on remote server
        
        Input:
            command    - Exmaple 'ls -l'
        
        Return:
            0 in error case else 1
        """
        if not self.status:
            return 0

        stdin, stdout, stderr = self.__sshClientObj.exec_command(command)
        
        result = stderr.readlines()
        if len(result) > 1:
            return 0

        result = stdout.readlines()
        if len(result) > 1:
            return result[0][:-1]
        
        return 1
       
    def mkdir(self, remotefolder):
        """
        mkdir is used to make a new directory in remote server
        
        Input:
            remotefolder    - directory name
        
        Return:
            0 in error case else 1
        """
        
        command = 'mkdir %s' %remotefolder
        
        return self.__execute(command)
    
    def pwd(self):

        command = 'pwd'
        
        return self.__execute(command)
        
    def cd(self, remotefolder):
        """
        cd is used to change remote working directory on server
        
        Input:
            remotefolder    - current working directory
            
        Affects:
            self.remotefolder
        
        Return: 
            0 in case of error else 1
        """
        if not self.status:
            return 0

        if remotefolder == self.remotefolder:
            return 1
        
        chk_command = "cd %s; pwd" %remotefolder
        mkdir_command = "mkdir %s" %remotefolder
        
        if not self.__execute(chk_command):
            if not self.__execute(mkdir_command):
                self.remotefolder = None
                return 0
            
        self.remotefolder = remotefolder
        
        return 1
    
    def sendFile(self, fullfilename):

        if not self.status:
            return 0
        
        try:
            self.__scpClientObj.put(fullfilename, remote_path=self.remotefolder)
        except:
            return 0
        
        remotefile = os.path.join(self.remotefolder, os.path.split(fullfilename)[-1])
        command = 'chmod 775 %s' %remotefile
        
        return self.__execute(command)
    
class SendToServer(ProcessingUnit):
    
    def __init__(self):
        
        ProcessingUnit.__init__(self)
        
        self.isConfig = False
        self.clientObj = None
    
    def setup(self, server, username, password, remotefolder, localfolder, ext='.png', period=60, protocol='ftp'):
        
        self.clientObj = None
        self.localfolder = localfolder
        self.ext = ext
        self.period = period
        
        if str.lower(protocol) == 'ftp':
            self.clientObj = FTPClient(server, username, password, remotefolder, period)
        
        if str.lower(protocol) == 'ssh':
            self.clientObj = SSHClient(server, username, password, remotefolder, period)
        
        if not self.clientObj:
            raise ValueError, "%s has been chosen as remote access protocol but it is not valid" %protocol
        
        self.clientObj.start()
        
    def findFiles(self):
        
        filenameList = glob.glob1(self.localfolder, '*%s' %self.ext)
        
        if len(filenameList) < 1:
            return []
            
        fullfilenameList = [os.path.join(self.localfolder, thisFile) for thisFile in filenameList]
        
        return fullfilenameList
    
    def run(self, **kwargs):
        
        if not self.isConfig:
            self.init = time.time()
            self.setup(**kwargs)
            self.isConfig = True
        
        if time.time() - self.init >= self.period:
            fullfilenameList = self.findFiles()
            self.clientObj.updateFileList(fullfilenameList)
            self.init = time.time()
    
    def close(self):
        print "[Remote Server] Stopping thread"
        self.clientObj.stop()
        
        
class FTP(object):
    """
    Ftp is a public class used to define custom File Transfer Protocol from "ftplib" python module
    
    Non-standard Python modules used: None
    
    Written by "Daniel Suarez":mailto:daniel.suarez@jro.igp.gob.pe  Oct. 26, 2010
    """
    
    def __init__(self,server = None, username=None, password=None, remotefolder=None):        
        """
        This method is used to setting parameters for FTP and establishing connection to remote server
        
        Inputs:
            server    - remote server IP Address 
            
            username    - remote server Username 
            
            password    - remote server password
            
            remotefolder    - remote server current working directory
        
        Return: void
        
        Affects: 
            self.status    - in Error Case or Connection Failed this parameter is set to 1 else 0
            
            self.folderList    - sub-folder list of remote folder
            
            self.fileList    - file list of remote folder
            
            
        """
        
        if ((server == None) and (username==None) and (password==None) and (remotefolder==None)):
            server, username, password, remotefolder = self.parmsByDefault()
        
        self.server = server
        self.username = username
        self.password = password
        self.remotefolder = remotefolder
        self.file = None
        self.ftp = None
        self.status = 0
        
        try:
            self.ftp = ftplib.FTP(self.server)
            self.ftp.login(self.username,self.password)
            self.ftp.cwd(self.remotefolder)            
#            print 'Connect to FTP Server: Successfully'
        
        except ftplib.all_errors:
            print 'Error FTP Service'
            self.status = 1
            return
        
        
        
        self.dirList = []

        try:
            self.dirList = self.ftp.nlst()
        
        except ftplib.error_perm, resp:
            if str(resp) == "550 No files found":
                    print "no files in this directory"
                    self.status = 1
                    return
        
        except ftplib.all_errors:
            print 'Error Displaying Dir-Files'
            self.status = 1
            return
        
        self.fileList = []
        self.folderList = []
        #only for test
        for f in self.dirList:
            name, ext = os.path.splitext(f)
            if ext != '':
                self.fileList.append(f)
#                print 'filename: %s - size: %d'%(f,self.ftp.size(f))

    def parmsByDefault(self):
        server = 'jro-app.igp.gob.pe'
        username = 'wmaster'
        password = 'mst2010vhf'
        remotefolder = '/home/wmaster/graficos'
        
        return server, username, password, remotefolder
        
    
    def mkd(self,dirname):
        """
        mkd is used to make directory in remote server
        
        Input:
            dirname    - directory name
        
        Return:
            1 in error case else 0
        """
        try: 
            self.ftp.mkd(dirname)
        except:
            print 'Error creating remote folder:%s'%dirname
            return 1
        
        return 0
    
    
    def delete(self,filename):
        """
        delete is used to delete file in current working directory of remote server
        
        Input:
            filename    - filename to delete in remote folder
            
        Return:
            1 in error case else 0
        """
        
        try:
            self.ftp.delete(filename)
        except:
            print 'Error deleting remote file:%s'%filename
            return 1
        
        return 0
    
    def download(self,filename,localfolder):
        """
        download is used to downloading file from remote folder into local folder
        
        Inputs:
            filename    - filename to donwload
            
            localfolder    - directory local to store filename
        
        Returns:
            self.status    - 1 in error case else 0
        """
        
        self.status = 0
        
        
        if not(filename in self.fileList):
            print 'filename:%s not exists'%filename
            self.status = 1
            return self.status
                
        newfilename = os.path.join(localfolder,filename)
                        
        self.file = open(newfilename, 'wb') 
        
        try:
            print 'Download: ' + filename                       
            self.ftp.retrbinary('RETR ' + filename, self.__handleDownload)
            print 'Download Complete'
        except ftplib.all_errors:
            print 'Error Downloading ' + filename
            self.status = 1
            return self.status
        
        self.file.close()
        
        return self.status 


    def __handleDownload(self,block):
        """
        __handleDownload is used to handle writing file
        """
        self.file.write(block)
    
    
    def upload(self,filename,remotefolder=None):
        """
        upload is used to uploading local file to remote directory
        
        Inputs:
            filename    - full path name of local file to store in remote directory
            
            remotefolder    - remote directory 
            
        Returns:
            self.status    - 1 in error case else 0
        """
        
        if remotefolder == None:
            remotefolder = self.remotefolder
        
        self.status = 0
        
        try:
            self.ftp.cwd(remotefolder)                
            
            self.file = open(filename, 'rb')
            
            (head, tail) = os.path.split(filename)
            
            command = "STOR " + tail
        
            print 'Uploading: ' + tail
            self.ftp.storbinary(command, self.file)        
            print 'Upload Completed'
        
        except ftplib.all_errors:
            print 'Error Uploading ' + tail
            self.status = 1
            return self.status
        
        self.file.close()
        
        #back to initial directory in __init__()
        self.ftp.cwd(self.remotefolder) 
        
        return self.status 
        
        
    def dir(self,remotefolder):
        """
        dir is used to change working directory of remote server and get folder and file list
        
        Input:
            remotefolder    - current working directory
            
        Affects:
            self.fileList    - file list of working directory
        
        Return: 
            infoList    - list with filenames and size of file in bytes
            
            self.folderList    -    folder list
        """
        
        self.remotefolder = remotefolder
        print 'Change to ' + self.remotefolder
        try:        
            self.ftp.cwd(remotefolder)        
        except ftplib.all_errors:
            print 'Error Change to ' + self.remotefolder            
            infoList = None
            self.folderList = None
            return infoList,self.folderList
        
        self.dirList = []

        try:
            self.dirList = self.ftp.nlst()
        
        except ftplib.error_perm, resp:
            if str(resp) == "550 No files found":                    
                    print "no files in this directory"
                    infoList = None
                    self.folderList = None
                    return infoList,self.folderList
        except ftplib.all_errors:
            print 'Error Displaying Dir-Files'
            infoList = None
            self.folderList = None
            return infoList,self.folderList          
                
        infoList = [] 
        self.fileList = []
        self.folderList = []
        for f in self.dirList:
            name,ext = os.path.splitext(f)
            if ext != '':                                 
                self.fileList.append(f)
                value = (f,self.ftp.size(f))
                infoList.append(value)                    
            
            if ext == '':                
                self.folderList.append(f)
                 
        return infoList,self.folderList
                       
                        
    def close(self):
        """
        close is used to close and end FTP connection
        
        Inputs: None
        
        Return: void
        
        """
        self.ftp.close()

class SendByFTP(Operation):
    
    def __init__(self):
        
        self.status = 1
        self.counter = 0
    
    def error_print(self, ValueError):
        
        print ValueError, 'Error FTP'
        print "don't worry the program is running..."
    
    def worker_ftp(self, server, username, password, remotefolder, filenameList):
        
        self.ftpClientObj = FTP(server, username, password, remotefolder)
        for filename in filenameList:
            self.ftpClientObj.upload(filename)
        self.ftpClientObj.close()
    
    def ftp_thread(self, server, username, password, remotefolder):
        if not(self.status):
            return
        
        p = multiprocessing.Process(target=self.worker_ftp, args=(server, username, password, remotefolder, self.filenameList,))
        p.start()
        
        p.join(3)
        
        if p.is_alive():
            p.terminate()
            p.join()
            print 'killing ftp process...'
            self.status = 0
            return
        
        self.status = 1
        return
    
    def filterByExt(self, ext, localfolder):
        fnameList = glob.glob1(localfolder,ext)
        self.filenameList = [os.path.join(localfolder,x) for x in fnameList]

        if len(self.filenameList) == 0:
            self.status = 0
    
    def run(self, dataOut, ext, localfolder, remotefolder, server, username, password, period=1):
        
        self.counter += 1 
        if self.counter >= period:
            self.filterByExt(ext, localfolder)
            
            self.ftp_thread(server, username, password, remotefolder)

            self.counter = 0
        
        self.status = 1