#!/usr/bin/env python

import os
from dm.common.utility.loggingManager import LoggingManager
from dm.common.utility.dmSubprocess import DmSubprocess
from dm.common.exceptions.invalidArgument import InvalidArgument
from dm.common.exceptions.invalidRequest import InvalidRequest
from fileProcessor import FileProcessor

class FileTransferPlugin(FileProcessor):

    def __init__(self, command, src=None, dest=None):
        FileProcessor.__init__(self)
        self.src = src
        self.dest = dest
        self.logger = LoggingManager.getInstance().getLogger(self.__class__.__name__)
        if command is None or not len(command):
            raise InvalidArgument('File transfer command must be non-empty string.')
        self.command = command
        self.subprocess = None

    def processFile(self, fileInfo):
        filePath = fileInfo.get('filePath')
        dataDirectory = fileInfo.get('dataDirectory')
        experiment = fileInfo.get('experiment')

        storageHost = experiment.get('storageHost')
        storageDirectory = experiment.get('storageDirectory')
        destUrl = self.getDestUrl(storageHost, storageDirectory)
        srcUrl = self.getSrcUrl(filePath, dataDirectory)
        self.start(srcUrl, destUrl)

    def getSrcUrl(self, filePath, dataDirectory):
        # Use relative path with respect to data directory as a source
        os.chdir(dataDirectory)
        srcUrl = os.path.relpath(filePath, dataDirectory)
        return srcUrl
    
    def getDestUrl(self, storageHost, storageDirectory):
        destUrl = '%s:%s' % (storageHost, storageDirectory)
        return destUrl
    
    def getFullCommand(self, src, dest):
        return '%s %s %s' % (self.command, src, dest)

    def setSrc(self, src):
        self.src = src

    def setDest(self, dest):
        self.dest = dest

    def start(self, src=None, dest=None):
        # Use preconfigured source if provided source is None
        fileSrc = src
        if src is None:
            fileSrc = self.src
        # Use provided destination only if preconfigured destination is None
        # Plugins may have desired destination preconfigured for all files
        fileDest = self.dest
        if self.dest is None:
            fileDest = dest

        if not fileSrc or not fileDest:
            raise InvalidRequest('Both source and destination must be non-empty strings.')
        self.subprocess = DmSubprocess.getSubprocess(self.getFullCommand(fileSrc, fileDest))
        return self.subprocess.run()

    def wait(self):
        if self.subprocess:
            return self.subprocess.wait()
        return None

    def poll(self):
        if self.subprocess:
            return self.subprocess.poll()
        return None

    def getStdOut(self):
        if self.subprocess:
            return self.subprocess.getStdOut()
        return None


    def getStdErr(self):
        if self.subprocess:
            return self.subprocess.getStdErr()
        return None

    def getExitStatus(self):
        if self.subprocess:
            return self.subprocess.getExitStatus()
        return None

    def reset(self):
        self.subprocess = None

#######################################################################
# Testing.
if __name__ == '__main__':
    ft = FileTransfer('rsync -arv', '/tmp/xyz', '/tmp/xyz2')
    ft.start()
    print 'StdOut: ', ft.getStdOut()
    print 'StdErr: ', ft.getStdErr()
    print 'Exit Status: ', ft.getExitStatus()