# Copyright 2014 Budapest University of Technology and Economics (BME IK)
#
# This file is part of CIRCLE Cloud.
#
# CIRCLE is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# CIRCLE 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 General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along
# with CIRCLE.  If not, see <http://www.gnu.org/licenses/>.
import json
import logging
from urllib.parse import urlparse

import os
from datetime import datetime
from django.conf import settings
from django.http import Http404
from os.path import splitext
from requests import get, post, codes
from sizefield.utils import filesizeformat

from storage.models import Disk

try:
    # Python 2: "unicode" is built-in
    unicode
except NameError:
    unicode = str

logger = logging.getLogger(__name__)


class StoreApiException(Exception):
    pass


class NotOkException(StoreApiException):
    def __init__(self, status, *args, **kwargs):
        self.status = status
        super(NotOkException, self).__init__(*args, **kwargs)


class NoStoreException(StoreApiException):
    pass


class Store(object):

    def __init__(self, user, default_timeout=5):
        self.store_url = settings.STORE_URL
        if not self.store_url:
            raise NoStoreException

        if user.is_superuser and not user.profile.org_id:
            self.username = 'u-admin'
        elif not user.profile.org_id:
            raise NoStoreException
        else:
            self.username = 'u-%s' % user.profile.org_id

        self.request_args = {'verify': settings.STORE_VERIFY_SSL}
        if settings.STORE_SSL_AUTH:
            self.request_args['cert'] = (settings.STORE_CLIENT_CERT,
                                         settings.STORE_CLIENT_KEY)
        if settings.STORE_BASIC_AUTH:
            self.request_args['auth'] = (settings.STORE_CLIENT_USER,
                                         settings.STORE_CLIENT_PASSWORD)
        self.default_timeout = default_timeout

    def _request(self, url, method=get, timeout=None,
                 raise_status_code=True, **kwargs):
        url = urljoin(self.store_url, url)
        if timeout is None:
            timeout = self.default_timeout
        kwargs['USER'] = self.username
        payload = json.dumps(kwargs)
        try:
            headers = {'content-type': 'application/json'}
            response = method(url, data=payload, headers=headers,
                              timeout=timeout, **self.request_args)
        except Exception:
            logger.exception("Error in store %s loading %s",
                             unicode(method), url)
            raise
        else:
            if raise_status_code and response.status_code != codes.ok:
                if response.status_code == 404:
                    raise Http404()
                else:
                    raise NotOkException(response.status_code)
            return response

    def _request_cmd(self, cmd, **kwargs):
        return self._request("/user/", post, CMD=cmd, **kwargs)

    def list(self, path, process=True):
        r = self._request_cmd("LIST", PATH=path)
        result = r.json()
        if process:
            return self._process_list(result)
        else:
            return result

    def toplist(self, process=True):
        r = self._request_cmd("TOPLIST")
        result = r.json()
        if process:
            return self._process_list(result)
        else:
            return result

    def get_files_with_exts(self, exts, path='/'):
        """
        Get list of files from store with the given file extensions.
        """
        matching_files = []
        file_list = self.list(path, process=False)
        for item in file_list:
            if os.path.splitext(item['NAME'])[1].strip('.') in exts:
                matching_files.append(os.path.join(path, item['NAME']))
        return matching_files

    def request_download(self, path):
        r = self._request_cmd("DOWNLOAD", PATH=path, timeout=10)
        return r.json()['LINK']

    def request_upload(self, path):
        r = self._request_cmd("UPLOAD", PATH=path)
        return r.json()['LINK']

    def request_ssh_download(self, path):
        r = self._request_cmd("SSH_DOWNLOAD", PATH=path)
        return r.json()['LINK'], r.json()['PORT']

    def request_ssh_upload(self):
        r = self._request_cmd("SSH_UPLOAD")
        return r.json()['LINK'], r.json()['PORT']

    def ssh_upload_finished(self, uploaded_name, path):
        self._request_cmd(
            "SSH_UPLOAD_FINISHED",
            FILENAME=uploaded_name,
            PATH=path,
        )

    def remove(self, path):
        self._request_cmd("REMOVE", PATH=path)

    def new_folder(self, path):
        self._request_cmd("NEW_FOLDER", PATH=path)

    def rename(self, old_path, new_name):
        self._request_cmd("RENAME", PATH=old_path, NEW_NAME=new_name)

    def get_quota(self):  # no CMD? :o
        r = self._request("/user/")
        quota = r.json()
        quota.update({
            'readable_used': filesizeformat(float(quota['used'])),
            'readable_soft': filesizeformat(float(quota['soft'])),
            'readable_hard': filesizeformat(float(quota['hard'])),
        })
        return quota

    def set_quota(self, quota):
        self._request("/quota/", post, QUOTA=quota)

    def user_exist(self):
        try:
            self._request("/user/")
            return True
        except NotOkException:
            return False

    def create_user(self, password, keys, quota):
        self._request("/new/", method=post,
                      SMBPASSWD=password, KEYS=keys, QUOTA=quota)

    @staticmethod
    def _process_list(content):
        for d in content:
            d['human_readable_date'] = datetime.utcfromtimestamp(float(
                d['MTIME']))
            delta = (datetime.utcnow() -
                     d['human_readable_date']).total_seconds()
            d['is_new'] = 0 < delta < 5
            d['human_readable_size'] = (
                "directory" if d['TYPE'] == "D" else
                filesizeformat(float(d['SIZE'])))

            if d['DIR'] == ".":
                d['directory'] = "/"
            else:
                d['directory'] = "/" + d['DIR'] + "/"

            d['path'] = d['directory']
            d['path'] += d['NAME']
            if d['TYPE'] == "D":
                d['path'] += "/"

            d['ext'] = splitext(d['path'])[1]
            d['icon'] = ("folder-open" if not d['TYPE'] == "F"
                         else file_icons.get(d['ext'], "file-o"))

        return sorted(content, key=lambda k: k['TYPE'])


file_icons = {
    '.txt': "file-text-o",
    '.pdf': "file-pdf-o",

    '.jpg': "file-image-o",
    '.jpeg': "file-image-o",
    '.png': "file-image-o",
    '.gif': "file-image-o",

    '.avi': "file-video-o",
    '.mkv': "file-video-o",
    '.mp4': "file-video-o",
    '.mov': "file-video-o",

    '.mp3': "file-sound-o",
    '.flac': "file-sound-o",
    '.wma': "file-sound-o",

    '.pptx': "file-powerpoint-o",
    '.ppt': "file-powerpoint-o",
    '.doc': "file-word-o",
    '.docx': "file-word-o",
    '.xlsx': "file-excel-o",
    '.xls': "file-excel-o",

    '.rar': "file-archive-o",
    '.zip': "file-archive-o",
    '.7z': "file-archive-o",
    '.tar': "file-archive-o",
    '.gz': "file-archive-o",

    '.py': "file-code-o",
    '.html': "file-code-o",
    '.js': "file-code-o",
    '.css': "file-code-o",
    '.c': "file-code-o",
    '.cpp': "file-code-o",
    '.h': "file-code-o",
    '.sh': "file-code-o",
}
