#!/usr/bin/env python2
# -*- coding: utf-8 -*-

# jp: a SAT command line tool
# Copyright (C) 2009-2018 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


import base
import sys
import os
import os.path
import tarfile
from sat.core.i18n import _
from sat_frontends.jp.constants import Const as C
from sat_frontends.jp import common
from sat_frontends.tools import jid
from sat.tools.common.ansi import ANSI as A
import tempfile
import xml.etree.ElementTree as ET # FIXME: used temporarily to manage XMLUI
from functools import partial
import json

__commands__ = ["File"]


class Send(base.CommandBase):
    def __init__(self, host):
        super(Send, self).__init__(host, 'send', use_progress=True, use_verbose=True, help=_('send a file to a contact'))
        self.need_loop=True

    def add_parser_options(self):
        self.parser.add_argument("files", type=str, nargs='+', metavar='file', help=_(u"a list of file"))
        self.parser.add_argument("jid", type=base.unicode_decoder, help=_(u"the destination jid"))
        self.parser.add_argument("-b", "--bz2", action="store_true", help=_(u"make a bzip2 tarball"))
        self.parser.add_argument("-d", "--path", type=base.unicode_decoder, help=(u"path to the directory where the file must be stored"))
        self.parser.add_argument("-N", "--namespace", type=base.unicode_decoder, help=(u"namespace of the file"))
        self.parser.add_argument("-n", "--name", type=base.unicode_decoder, default=u'', help=(u"name to use (DEFAULT: use source file name)"))

    def start(self):
        """Send files to jabber contact"""
        self.send_files()

    def onProgressStarted(self, metadata):
        self.disp(_(u'File copy started'),2)

    def onProgressFinished(self, metadata):
        self.disp(_(u'File sent successfully'),2)

    def onProgressError(self, error_msg):
        if error_msg == C.PROGRESS_ERROR_DECLINED:
            self.disp(_(u'The file has been refused by your contact'))
        else:
            self.disp(_(u'Error while sending file: {}').format(error_msg),error=True)

    def gotId(self, data, file_):
        """Called when a progress id has been received

        @param pid(unicode): progress id
        @param file_(str): file path
        """
        #FIXME: this show progress only for last progress_id
        self.disp(_(u"File request sent to {jid}".format(jid=self.full_dest_jid)), 1)
        try:
            self.progress_id = data['progress']
        except KeyError:
            # TODO: if 'xmlui' key is present, manage xmlui message display
            self.disp(_(u"Can't send file to {jid}".format(jid=self.full_dest_jid)), error=True)
            self.host.quit(2)

    def error(self, failure):
        self.disp(_("Error while trying to send a file: {reason}").format(reason=failure), error=True)
        self.host.quit(1)

    def send_files(self):
        for file_ in self.args.files:
            if not os.path.exists(file_):
                self.disp(_(u"file [{}] doesn't exist !").format(file_), error=True)
                self.host.quit(1)
            if not self.args.bz2 and os.path.isdir(file_):
                self.disp(_(u"[{}] is a dir ! Please send files inside or use compression").format(file_))
                self.host.quit(1)

        self.full_dest_jid = self.host.get_full_jid(self.args.jid)
        extra = {}
        if self.args.path:
            extra[u'path'] = self.args.path
        if self.args.namespace:
            extra[u'namespace'] = self.args.namespace

        if self.args.bz2:
            with tempfile.NamedTemporaryFile('wb', delete=False) as buf:
                self.host.addOnQuitCallback(os.unlink, buf.name)
                self.disp(_(u"bz2 is an experimental option, use with caution"))
                #FIXME: check free space
                self.disp(_(u"Starting compression, please wait..."))
                sys.stdout.flush()
                bz2 = tarfile.open(mode="w:bz2", fileobj=buf)
                archive_name = u'{}.tar.bz2'.format(os.path.basename(self.args.files[0]) or u'compressed_files')
                for file_ in self.args.files:
                    self.disp(_(u"Adding {}").format(file_), 1)
                    bz2.add(file_)
                bz2.close()
                self.disp(_(u"Done !"), 1)

                self.host.bridge.fileSend(self.full_dest_jid, buf.name, self.args.name or archive_name, '', extra, self.profile,
                                          callback=lambda pid, file_=buf.name: self.gotId(pid, file_), errback=self.error)
        else:
            for file_ in self.args.files:
                path = os.path.abspath(file_)
                self.host.bridge.fileSend(self.full_dest_jid, path, self.args.name, '', extra, self.profile,
                                          callback=lambda pid, file_=file_: self.gotId(pid, file_), errback=self.error)


class Request(base.CommandBase):

    def __init__(self, host):
        super(Request, self).__init__(host, 'request', use_progress=True, use_verbose=True, help=_('request a file from a contact'))
        self.need_loop=True

    @property
    def filename(self):
        return self.args.name or self.args.hash or u"output"

    def add_parser_options(self):
        self.parser.add_argument("jid", type=base.unicode_decoder, help=_(u"the destination jid"))
        self.parser.add_argument("-D", "--dest", type=base.unicode_decoder, help=_(u"destination path where the file will be saved (default: [current_dir]/[name|hash])"))
        self.parser.add_argument("-n", "--name", type=base.unicode_decoder, default=u'', help=_(u"name of the file"))
        self.parser.add_argument("-H", "--hash", type=base.unicode_decoder, default=u'', help=_(u"hash of the file"))
        self.parser.add_argument("-a", "--hash-algo", type=base.unicode_decoder, default=u'sha-256', help=_(u"hash algorithm use for --hash (default: sha-256)"))
        self.parser.add_argument("-d", "--path", type=base.unicode_decoder, help=(u"path to the directory containing the file"))
        self.parser.add_argument("-N", "--namespace", type=base.unicode_decoder, help=(u"namespace of the file"))
        self.parser.add_argument("-f", "--force", action='store_true', help=_(u"overwrite existing file without confirmation"))

    def onProgressStarted(self, metadata):
        self.disp(_(u'File copy started'),2)

    def onProgressFinished(self, metadata):
        self.disp(_(u'File received successfully'),2)

    def onProgressError(self, error_msg):
        if error_msg == C.PROGRESS_ERROR_DECLINED:
            self.disp(_(u'The file request has been refused'))
        else:
            self.disp(_(u'Error while requesting file: {}').format(error_msg), error=True)

    def gotId(self, progress_id):
        """Called when a progress id has been received

        @param progress_id(unicode): progress id
        """
        self.progress_id = progress_id

    def error(self, failure):
        self.disp(_("Error while trying to send a file: {reason}").format(reason=failure), error=True)
        self.host.quit(1)

    def start(self):
        if not self.args.name and not self.args.hash:
            self.parser.error(_(u'at least one of --name or --hash must be provided'))
        # extra = dict(self.args.extra)
        if self.args.dest:
            path = os.path.abspath(os.path.expanduser(self.args.dest))
            if os.path.isdir(path):
                path = os.path.join(path, self.filename)
        else:
            path = os.path.abspath(self.filename)

        if os.path.exists(path) and not self.args.force:
            message = _(u'File {path} already exists! Do you want to overwrite?').format(path=path)
            confirm = raw_input(u"{} (y/N) ".format(message).encode('utf-8'))
            if confirm not in (u"y", u"Y"):
                self.disp(_(u"file request cancelled"))
                self.host.quit(2)

        self.full_dest_jid = self.host.get_full_jid(self.args.jid)
        extra = {}
        if self.args.path:
            extra[u'path'] = self.args.path
        if self.args.namespace:
            extra[u'namespace'] = self.args.namespace
        self.host.bridge.fileJingleRequest(self.full_dest_jid,
                                           path,
                                           self.args.name,
                                           self.args.hash,
                                           self.args.hash_algo if self.args.hash else u'',
                                           extra,
                                           self.profile,
                                           callback=self.gotId,
                                           errback=partial(self.errback,
                                               msg=_(u"can't request file: {}"),
                                               exit_code=C.EXIT_BRIDGE_ERRBACK))


class Receive(base.CommandAnswering):

    def __init__(self, host):
        super(Receive, self).__init__(host, 'receive', use_progress=True, use_verbose=True, help=_('wait for a file to be sent by a contact'))
        self._overwrite_refused = False # True when one overwrite as already been refused
        self.action_callbacks = {C.META_TYPE_FILE: self.onFileAction,
                                 C.META_TYPE_OVERWRITE: self.onOverwriteAction}

    def onProgressStarted(self, metadata):
        self.disp(_(u'File copy started'),2)

    def onProgressFinished(self, metadata):
        self.disp(_(u'File received successfully'),2)
        if metadata.get('hash_verified', False):
            try:
                self.disp(_(u'hash checked: {algo}:{checksum}').format(
                    algo=metadata['hash_algo'],
                    checksum=metadata['hash']),
                    1)
            except KeyError:
                self.disp(_(u'hash is checked but hash value is missing', 1), error=True)
        else:
            self.disp(_(u"hash can't be verified"), 1)

    def onProgressError(self, error_msg):
        self.disp(_(u'Error while receiving file: {}').format(error_msg),error=True)

    def getXmluiId(self, action_data):
        # FIXME: we temporarily use ElementTree, but a real XMLUI managing module
        #        should be available in the futur
        # TODO: XMLUI module
        try:
            xml_ui = action_data['xmlui']
        except KeyError:
            self.disp(_(u"Action has no XMLUI"), 1)
        else:
            ui = ET.fromstring(xml_ui.encode('utf-8'))
            xmlui_id = ui.get('submit')
            if not xmlui_id:
                self.disp(_(u"Invalid XMLUI received"), error=True)
            return xmlui_id

    def onFileAction(self, action_data, action_id, security_limit, profile):
        xmlui_id = self.getXmluiId(action_data)
        if xmlui_id is None:
            return self.host.quitFromSignal(1)
        try:
            from_jid = jid.JID(action_data['meta_from_jid'])
        except KeyError:
            self.disp(_(u"Ignoring action without from_jid data"), 1)
            return
        try:
            progress_id = action_data['meta_progress_id']
        except KeyError:
            self.disp(_(u"ignoring action without progress id"), 1)
            return

        if not self.bare_jids or from_jid.bare in self.bare_jids:
            if self._overwrite_refused:
                self.disp(_(u"File refused because overwrite is needed"), error=True)
                self.host.bridge.launchAction(xmlui_id, {'cancelled': C.BOOL_TRUE}, profile_key=profile)
                return self.host.quitFromSignal(2)
            self.progress_id = progress_id
            xmlui_data = {'path': self.path}
            self.host.bridge.launchAction(xmlui_id, xmlui_data, profile_key=profile)

    def onOverwriteAction(self, action_data, action_id, security_limit, profile):
        xmlui_id = self.getXmluiId(action_data)
        if xmlui_id is None:
            return self.host.quitFromSignal(1)
        try:
            progress_id = action_data['meta_progress_id']
        except KeyError:
            self.disp(_(u"ignoring action without progress id"), 1)
            return
        self.disp(_(u"Overwriting needed"), 1)

        if progress_id == self.progress_id:
            if self.args.force:
                self.disp(_(u"Overwrite accepted"), 2)
            else:
                self.disp(_(u"Refused to overwrite"), 2)
                self._overwrite_refused = True

            xmlui_data = {'answer': C.boolConst(self.args.force)}
            self.host.bridge.launchAction(xmlui_id, xmlui_data, profile_key=profile)

    def add_parser_options(self):
        self.parser.add_argument("jids", type=base.unicode_decoder, nargs="*", help=_(u'jids accepted (accept everything if none is specified)'))
        self.parser.add_argument("-m", "--multiple", action="store_true", help=_(u"accept multiple files (you'll have to stop manually)"))
        self.parser.add_argument("-f", "--force", action="store_true", help=_(u"force overwritting of existing files (/!\\ name is choosed by sender)"))
        self.parser.add_argument("--path", default='.', metavar='DIR', help=_(u"destination path (default: working directory)"))

    def start(self):
        self.bare_jids = [jid.JID(jid_).bare for jid_ in self.args.jids]
        self.path = os.path.abspath(self.args.path)
        if not os.path.isdir(self.path):
            self.disp(_(u"Given path is not a directory !", error=True))
            self.host.quit(2)
        if self.args.multiple:
            self.host.quit_on_progress_end = False
        self.disp(_(u"waiting for incoming file request"),2)


class Upload(base.CommandBase):

    def __init__(self, host):
        super(Upload, self).__init__(host, 'upload', use_progress=True, use_verbose=True, help=_('upload a file'))
        self.need_loop=True

    def add_parser_options(self):
        self.parser.add_argument("file", type=str, help=_("file to upload"))
        self.parser.add_argument("jid", type=base.unicode_decoder, nargs='?',  help=_("jid of upload component (nothing to autodetect)"))
        self.parser.add_argument("--ignore-tls-errors", action="store_true", help=_("ignore invalide TLS certificate"))

    def onProgressStarted(self, metadata):
        self.disp(_(u'File upload started'),2)

    def onProgressFinished(self, metadata):
        self.disp(_(u'File uploaded successfully'),2)
        try:
            url = metadata['url']
        except KeyError:
            self.disp(u'download URL not found in metadata')
        else:
            self.disp(_(u'URL to retrieve the file:'),1)
            # XXX: url is display alone on a line to make parsing easier
            self.disp(url)

    def onProgressError(self, error_msg):
        self.disp(_(u'Error while uploading file: {}').format(error_msg),error=True)

    def gotId(self, data, file_):
        """Called when a progress id has been received

        @param pid(unicode): progress id
        @param file_(str): file path
        """
        try:
            self.progress_id = data['progress']
        except KeyError:
            # TODO: if 'xmlui' key is present, manage xmlui message display
            self.disp(_(u"Can't upload file"), error=True)
            self.host.quit(2)

    def error(self, failure):
        self.disp(_("Error while trying to upload a file: {reason}").format(reason=failure), error=True)
        self.host.quit(1)

    def start(self):
        file_ = self.args.file
        if not os.path.exists(file_):
            self.disp(_(u"file [{}] doesn't exist !").format(file_), error=True)
            self.host.quit(1)
        if os.path.isdir(file_):
            self.disp(_(u"[{}] is a dir! Can't upload a dir").format(file_))
            self.host.quit(1)

        self.full_dest_jid = self.host.get_full_jid(self.args.jid) if self.args.jid is not None else ''
        options = {}
        if self.args.ignore_tls_errors:
            options['ignore_tls_errors'] = C.BOOL_TRUE

        path = os.path.abspath(file_)
        self.host.bridge.fileUpload(path, '', self.full_dest_jid, options, self.profile, callback=lambda pid, file_=file_: self.gotId(pid, file_), errback=self.error)


class ShareList(base.CommandBase):

    def __init__(self, host):
        extra_outputs = {'default': self.default_output}
        super(ShareList, self).__init__(host, 'list', use_output=C.OUTPUT_LIST_DICT, extra_outputs=extra_outputs, help=_(u'retrieve files shared by an entity'), use_verbose=True)
        self.need_loop=True

    def add_parser_options(self):
        self.parser.add_argument("-d", "--path", default=u'', help=_(u"path to the directory containing the files"))
        self.parser.add_argument("jid", type=base.unicode_decoder, nargs='?',  help=_("jid of sharing entity (nothing to check our own jid)"))

    def file_gen(self, files_data):
        for file_data in files_data:
            yield file_data[u'name']
            yield file_data.get(u'size', '')
            yield file_data.get(u'hash','')

    def _name_filter(self, name, row):
        if row.type == C.FILE_TYPE_DIRECTORY:
            return A.color(C.A_DIRECTORY, name)
        elif row.type == C.FILE_TYPE_FILE:
            return A.color(C.A_FILE, name)
        else:
            self.disp(_(u'unknown file type: {type}').format(type=row.type), error=True)
            return name

    def _size_filter(self, size, row):
        if not size:
            return u''
        size = int(size)
        # cf. https://stackoverflow.com/a/1094933 (thanks)
        suffix = u'o'
        for unit in [u'', u'Ki', u'Mi', u'Gi', u'Ti', u'Pi', u'Ei', u'Zi']:
            if abs(size) < 1024.0:
                return A.color(A.BOLD, u"{:.2f}".format(size), unit, suffix)
            size /= 1024.0

        return A.color(A.BOLD, u"{:.2f}".format(size), u'Yi', suffix)

    def default_output(self, files_data):
        """display files a way similar to ls"""
        files_data.sort(key=lambda d: d['name'].lower())
        show_header = False
        if self.verbosity == 0:
            headers = (u'name', u'type')
        elif self.verbosity == 1:
            headers = (u'name', u'type', u'size')
        elif self.verbosity > 1:
            show_header = True
            headers = (u'name', u'type', u'size', u'hash')
        table = common.Table.fromDict(self.host,
                                      files_data,
                                      headers,
                                      filters={u'name': self._name_filter,
                                               u'size': self._size_filter},
                                      defaults={u'size': u'',
                                                u'hash': u''},
                                      )
        table.display_blank(show_header=show_header, hide_cols=['type'])

    def _FISListCb(self, files_data):
        self.output(files_data)
        self.host.quit()

    def start(self):
        self.host.bridge.FISList(
            self.args.jid,
            self.args.path,
            {},
            self.profile,
            callback=self._FISListCb,
            errback=partial(self.errback,
                            msg=_(u"can't retrieve shared files: {}"),
                            exit_code=C.EXIT_BRIDGE_ERRBACK))


class SharePath(base.CommandBase):

    def __init__(self, host):
        super(SharePath, self).__init__(host, 'path', help=_(u'share a file or directory'), use_verbose=True)
        self.need_loop=True

    def add_parser_options(self):
        self.parser.add_argument("-n", "--name", type=base.unicode_decoder, default=u'', help=_(u"virtual name to use (default: use directory/file name)"))
        perm_group = self.parser.add_mutually_exclusive_group()
        perm_group.add_argument("-j", "--jid", type=base.unicode_decoder, action='append', dest="jids", default=[], help=_(u"jid of contacts allowed to retrieve the files"))
        perm_group.add_argument("--public", action='store_true', help=_(u"share publicly the file(s) (/!\\ *everybody* will be able to access them)"))
        self.parser.add_argument("path", type=base.unicode_decoder, help=_(u"path to a file or directory to share"))


    def _FISSharePathCb(self, name):
        self.disp(_(u'{path} shared under the name "{name}"').format(
            path = self.path,
            name = name))
        self.host.quit()

    def start(self):
        self.path = os.path.abspath(self.args.path)
        if self.args.public:
            access = {u'read': {u'type': u'public'}}
        else:
            jids = self.args.jids
            if jids:
                access = {u'read': {u'type': 'whitelist',
                                         u'jids': jids}}
            else:
                access = {}
        self.host.bridge.FISSharePath(
            self.args.name,
            self.path,
            json.dumps(access, ensure_ascii=False),
            self.profile,
            callback=self._FISSharePathCb,
            errback=partial(self.errback,
                            msg=_(u"can't share path: {}"),
                            exit_code=C.EXIT_BRIDGE_ERRBACK))


class Share(base.CommandBase):
    subcommands = (ShareList, SharePath)

    def __init__(self, host):
        super(Share, self).__init__(host, 'share', use_profile=False, help=_(u'files sharing management'))


class File(base.CommandBase):
    subcommands = (Send, Request, Receive, Upload, Share)

    def __init__(self, host):
        super(File, self).__init__(host, 'file', use_profile=False, help=_(u'files sending/receiving/management'))