# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.


from twisted.spread import pb

import os


class Maildir(pb.Referenceable):

    def __init__(self, directory, rootDirectory):
        self.virtualDirectory = directory
        self.rootDirectory = rootDirectory
        self.directory = os.path.join(rootDirectory, directory)


    def getFolderMessage(self, folder, name):
        if '/' in name:
            raise IOError("can only open files in '%s' directory'" % folder)
        with open(os.path.join(self.directory, 'new', name)) as fp:
            return fp.read()


    def deleteFolderMessage(self, folder, name):
        if '/' in name:
            raise IOError("can only delete files in '%s' directory'" % folder)
        os.rename(os.path.join(self.directory, folder, name),
                  os.path.join(self.rootDirectory, '.Trash', folder, name))


    def deleteNewMessage(self, name):
        return self.deleteFolderMessage('new', name)
    remote_deleteNewMessage = deleteNewMessage


    def deleteCurMessage(self, name):
        return self.deleteFolderMessage('cur', name)
    remote_deleteCurMessage = deleteCurMessage


    def getNewMessages(self):
        return os.listdir(os.path.join(self.directory, 'new'))
    remote_getNewMessages = getNewMessages


    def getCurMessages(self):
        return os.listdir(os.path.join(self.directory, 'cur'))
    remote_getCurMessages = getCurMessages


    def getNewMessage(self, name):
        return self.getFolderMessage('new', name)
    remote_getNewMessage = getNewMessage


    def getCurMessage(self, name):
        return self.getFolderMessage('cur', name)
    remote_getCurMessage = getCurMessage


    def getSubFolder(self, name):
        if name[0] == '.':
            raise IOError("subfolder name cannot begin with a '.'")
        name = name.replace('/', ':')
        if self.virtualDirectoy == '.':
            name = '.'+name
        else:
            name = self.virtualDirectory+':'+name
        if not self._isSubFolder(name):
            raise IOError("not a subfolder")
        return Maildir(name, self.rootDirectory)
    remote_getSubFolder = getSubFolder


    def _isSubFolder(self, name):
        return (not os.path.isdir(os.path.join(self.rootDirectory, name)) or
                not os.path.isfile(os.path.join(self.rootDirectory, name,
                                                'maildirfolder')))



class MaildirCollection(pb.Referenceable):
    def __init__(self, root):
        self.root = root


    def getSubFolders(self):
        return os.listdir(self.getRoot())
    remote_getSubFolders = getSubFolders


    def getSubFolder(self, name):
        if '/' in name or name[0] == '.':
            raise IOError("invalid name")
        return Maildir('.', os.path.join(self.getRoot(), name))
    remote_getSubFolder = getSubFolder



class MaildirBroker(pb.Broker):
    def proto_getCollection(self, requestID, name, domain, password):
        collection = self._getCollection()
        if collection is None:
            self.sendError(requestID, "permission denied")
        else:
            self.sendAnswer(requestID, collection)


    def getCollection(self, name, domain, password):
        if domain not in self.domains:
            return
        domain = self.domains[domain]
        if (name in domain.dbm and
            domain.dbm[name] == password):
            return MaildirCollection(domain.userDirectory(name))



class MaildirClient(pb.Broker):
    def getCollection(self, name, domain, password, callback, errback):
        requestID = self.newRequestID()
        self.waitingForAnswers[requestID] = callback, errback
        self.sendCall("getCollection", requestID, name, domain, password)