#!/usr/bin/python3

import os
import urllib
import socket

from gi.repository import GObject, Nautilus

class ownCloudExtension(GObject.GObject, Nautilus.ColumnProvider, Nautilus.InfoProvider):

    nautilusVFSFile_table = {}
    registered_paths = {}
    remainder = ''
    connected = False
    watch_id = 0

    def __init__(self):
        self.connectToOwnCloud
        if not self.connected:
            # try again in 5 seconds - attention, logic inverted!
            GObject.timeout_add(5000, self.connectToOwnCloud)

    def port(self):
        return 34001 # Fixme, read from config file.

    def connectToOwnCloud(self):
        try:
            self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            self.sock.connect(("localhost", self.port()))
            self.sock.settimeout(5)
            self.connected = True
            self.watch_id = GObject.io_add_watch(self.sock, GObject.IO_IN, self.handle_notify)
        except:
            print("Connect could not be established, try again later!")
            self.sock.close()
        return not self.connected

    def sendCommand(self, cmd):
        if self.connected:
            try:
                self.sock.send(cmd)
            except:
                print("Sending failed.")
                GObject.source_remove(self.watch_id)
                self.connected = False
                GObject.timeout_add(5000, self.connectToOwnCloud)

    def find_item_for_file(self, path):
        if path in self.nautilusVFSFile_table:
            return self.nautilusVFSFile_table[path]
        else:
            return None

    def askForOverlay(self, file):
        if os.path.isdir(file):
            folderStatus = self.sendCommand("RETRIEVE_FOLDER_STATUS:"+file+"\n");

        if os.path.isfile(file):
            fileStatus = self.sendCommand("RETRIEVE_FILE_STATUS:"+file+"\n");

    def invalidate_items_underneath(self, path):
        update_items = []
        for p in self.nautilusVFSFile_table:
            if p == path or p.startswith(path):
                item = self.nautilusVFSFile_table[p]
                update_items.append(item)

        for item in update_items:
            item.invalidate_extension_info()
            # self.update_file_info(item)

    # Handles a single line of server respoonse and sets the emblem
    def handle_server_response(self, l):
        Emblems = { 'OK'        : 'oC_ok',
                    'SYNC'      : 'oC_sync',
                    'NEW'       : 'oC_sync',
                    'IGNORE'    : 'oC_warn',
                    'ERROR'     : 'oC_error',
                    'OK+SWM'    : 'oC_ok_shared',
                    'SYNC+SWM'  : 'oC_sync_shared',
                    'NEW+SWM'   : 'oC_sync_shared',
                    'IGNORE+SWM': 'oC_warn_shared',
                    'ERROR+SWM' : 'oC_error_shared',
                    'NOP'       : 'oC_error'
                  }

        print("Server response: "+l)
        parts = l.split(':')
        if len(parts) > 0:
            action = parts[0]

            # file = parts[1]
            # print "Action for " + file + ": "+parts[0]
            if action == 'STATUS':
                emblem = Emblems[parts[1]]
                if emblem:
                    item = self.find_item_for_file(parts[2])
                    if item:
                        item.add_emblem(emblem)

            elif action == 'UPDATE_VIEW':
                # Search all items underneath this path and invalidate them
                if parts[1] in self.registered_paths:
                    self.invalidate_items_underneath(parts[1])

            elif action == 'REGISTER_PATH':
                self.registered_paths[parts[1]] = 1
                self.invalidate_items_underneath(parts[1])
            elif action == 'UNREGISTER_PATH':
                del self.registered_paths[parts[1]]
                self.invalidate_items_underneath(parts[1])

                # check if there are non pathes any more, if so, its usual
                # that mirall went away. Try reconnect.
                if not self.registered_paths:
                    self.sock.close()
                    self.connected = False
                    GObject.source_remove(self.watch_id)
                    GObject.timeout_add(5000, self.connectToOwnCloud)

            else:
                # print "We got unknown action " + action
                1

    # notify is the raw answer from the socket
    def handle_notify(self, source, condition):

        data = source.recv(1024)
        # prepend the remaining data from last call
        if len(self.remainder) > 0:
            data = self.remainder+data
            self.remainder = ''

        if len(data) > 0:
            # remember the remainder for next round
            lastNL = data.rfind('\n');
            if lastNL > -1 and lastNL < len(data):
                self.remainder = data[lastNL+1:]
                data = data[:lastNL]

            for l in data.split('\n'):
                self.handle_server_response(l)
        else:
            return False

        return True # run again

    def get_local_path(self, path):
        return path.replace("file://", "")

    def update_file_info(self, item):
        if item.get_uri_scheme() != 'file':
            return

        filename = urllib.unquote(item.get_uri()[7:])
        if item.is_directory():
            filename += '/'

        for reg_path in self.registered_paths:
            if filename.startswith(reg_path):
                self.nautilusVFSFile_table[filename] = item

                # item.add_string_attribute('share_state', "share state")
                self.askForOverlay(filename)
                break
            else:
                print("Not in scope:"+filename)