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

import db
import ub
from flask import current_app as app
import logging
from tempfile import gettempdir
import sys
import os
import traceback
import re
import unicodedata
from io import BytesIO
import converter
import asyncmail
import time

try:
    from StringIO import StringIO
    from email.MIMEBase import MIMEBase
    from email.MIMEMultipart import MIMEMultipart
    from email.MIMEText import MIMEText
except ImportError as e:
    from io import StringIO
    from email.mime.base import MIMEBase
    from email.mime.multipart import MIMEMultipart
    from email.mime.text import MIMEText

from email import encoders
from email.utils import formatdate
from email.utils import make_msgid
from flask import send_from_directory, make_response, redirect, abort
from flask_babel import gettext as _
import threading
import shutil
import requests
import zipfile
try:
    import gdriveutils as gd
except ImportError:
    pass
import web
import server

try:
    import unidecode
    use_unidecode = True
except ImportError:
    use_unidecode = False

# Global variables
updater_thread = None
global_eMailThread = asyncmail.EMailThread()
global_eMailThread.start()

RET_SUCCESS = 1
RET_FAIL = 0


def update_download(book_id, user_id):
    check = ub.session.query(ub.Downloads).filter(ub.Downloads.user_id == user_id).filter(ub.Downloads.book_id ==
                                                                                          book_id).first()

    if not check:
        new_download = ub.Downloads(user_id=user_id, book_id=book_id)
        ub.session.add(new_download)
        ub.session.commit()

def make_mobi(book_id, calibrepath):
    book = db.session.query(db.Books).filter(db.Books.id == book_id).first()
    data = db.session.query(db.Data).filter(db.Data.book == book.id).filter(db.Data.format == 'EPUB').first()
    if not data:
        error_message = _(u"epub format not found for book id: %(book)d", book=book_id)
        app.logger.error("make_mobi: " + error_message)
        return error_message, RET_FAIL
    if ub.config.config_use_google_drive:
        df = gd.getFileFromEbooksFolder(book.path, data.name + u".epub")
        if df:
            datafile = os.path.join(calibrepath, book.path, data.name + u".epub")
            if not os.path.exists(os.path.join(calibrepath, book.path)):
                os.makedirs(os.path.join(calibrepath, book.path))
            df.GetContentFile(datafile)
        else:
            error_message = "make_mobi: epub not found on gdrive: %s.epub" % data.name
            return error_message, RET_FAIL
    # else:
    file_path = os.path.join(calibrepath, book.path, data.name)
    if os.path.exists(file_path + u".epub"):
        # convert book, and upload in case of google drive
        res = converter.convert_mobi(file_path, book)
        if ub.config.config_use_google_drive:
            gd.updateGdriveCalibreFromLocal()
            # time.sleep(10)
        return res
    else:
        error_message = "make_mobi: epub not found: %s.epub" % file_path
        return error_message, RET_FAIL


def send_test_mail(kindle_mail, user_name):
    msg = MIMEMultipart()
    msg['Subject'] = _(u'Calibre-web test email')
    text = _(u'This email has been sent via calibre web.')
    msg.attach(MIMEText(text.encode('UTF-8'), 'plain', 'UTF-8'))
    global_eMailThread.add_email(msg,ub.get_mail_settings(),kindle_mail, user_name, _('Test E-Mail'))
    return # send_raw_email(kindle_mail, msg)


def send_mail(book_id, kindle_mail, calibrepath, user_id):
    """Send email with attachments"""
    # create MIME message
    result= None
    msg = MIMEMultipart()
    msg['Subject'] = _(u'Send to Kindle')
    msg['Message-Id'] = make_msgid('calibre-web')
    msg['Date'] = formatdate(localtime=True)
    text = _(u'This email has been sent via calibre web.')
    msg.attach(MIMEText(text.encode('UTF-8'), 'plain', 'UTF-8'))

    book = db.session.query(db.Books).filter(db.Books.id == book_id).first()
    data = db.session.query(db.Data).filter(db.Data.book == book.id).all()

    formats = {}
    index = 0
    for indx,entry in enumerate(data):
        if entry.format == "MOBI":
            formats["mobi"] = entry.name + ".mobi"
        if entry.format == "EPUB":
            formats["epub"] = entry.name + ".epub"
            index = indx
        if entry.format == "PDF":
            formats["pdf"] = entry.name + ".pdf"

    if len(formats) == 0:
        return _("Could not find any formats suitable for sending by email")

    if 'mobi' in formats:
        result = get_attachment(calibrepath, book.path, formats['mobi'])
        if result:
            msg.attach(result)
    elif 'epub' in formats:
        # returns filename if sucess, otherwise errormessage
        data, resultCode = make_mobi(book.id, calibrepath)
        if resultCode == RET_SUCCESS:
            result = get_attachment(calibrepath, book.path, os.path.basename(data))
            if result:
                msg.attach(result)
        else:
            app.logger.error(data)
            return data
    elif 'pdf' in formats:
        result = get_attachment(calibrepath, book.path, formats['pdf'])
        if result:
            msg.attach(result)
    else:
        return _("Could not find any formats suitable for sending by email")
    if result:
        global_eMailThread.add_email(msg,ub.get_mail_settings(),kindle_mail, user_id, _(u"E-Mail: %s" % book.title))
        return None # send_raw_email(kindle_mail, msg)
    else:
        return _('The requested file could not be read. Maybe wrong permissions?')


# For gdrive download book from gdrive to calibredir (temp dir for books), read contents in both cases and append
# it in MIME Base64 encoded to
def get_attachment(calibrepath, bookpath, filename):
    """Get file as MIMEBase message"""
    if ub.config.config_use_google_drive:
        df = gd.getFileFromEbooksFolder(bookpath, filename)
        if df:

            datafile = os.path.join(calibrepath, bookpath, filename)
            if not os.path.exists(os.path.join(calibrepath, bookpath)):
                os.makedirs(os.path.join(calibrepath, bookpath))
            df.GetContentFile(datafile)
        else:
            return None
        file_ = open(datafile, 'rb')
        data = file_.read()
        file_.close()
        os.remove(datafile)
    else:
        try:
            file_ = open(os.path.join(calibrepath, bookpath, filename), 'rb')
            data = file_.read()
            file_.close()
        except IOError:
            traceback.print_exc()
            app.logger.error = u'The requested file could not be read. Maybe wrong permissions?'
            return None

    attachment = MIMEBase('application', 'octet-stream')
    attachment.set_payload(data)
    encoders.encode_base64(attachment)
    attachment.add_header('Content-Disposition', 'attachment',
                          filename=filename)
    return attachment


def get_valid_filename(value, replace_whitespace=True):
    """
    Returns the given string converted to a string that can be used for a clean
    filename. Limits num characters to 128 max.
    """
    if value[-1:] == u'.':
        value = value[:-1]+u'_'
    value = value.replace("/", "_").replace(":", "_").strip('\0')
    if use_unidecode:
        value = (unidecode.unidecode(value)).strip()
    else:
        value = value.replace(u'§', u'SS')
        value = value.replace(u'ß', u'ss')
        value = unicodedata.normalize('NFKD', value)
        re_slugify = re.compile('[\W\s-]', re.UNICODE)
        if isinstance(value, str):  # Python3 str, Python2 unicode
            value = re_slugify.sub('', value).strip()
        else:
            value = unicode(re_slugify.sub('', value).strip())
    if replace_whitespace:
        #  *+:\"/<>? are replaced by _
        value = re.sub(r'[\*\+:\\\"/<>\?]+', u'_', value, flags=re.U)
        # pipe has to be replaced with comma
        value = re.sub(r'[\|]+', u',', value, flags=re.U)
    value = value[:128]
    if not value:
        raise ValueError("Filename cannot be empty")

    return value


def get_sorted_author(value):
    try:
        regexes = ["^(JR|SR)\.?$", "^I{1,3}\.?$", "^IV\.?$"]
        combined = "(" + ")|(".join(regexes) + ")"
        value = value.split(" ")
        if re.match(combined, value[-1].upper()):
            value2 = value[-2] + ", " + " ".join(value[:-2]) + " " + value[-1]
        else:
            value2 = value[-1] + ", " + " ".join(value[:-1])
    except Exception:
        web.app.logger.error("Sorting author " + str(value) + "failed")
        value2 = value
    return value2

# Deletes a book fro the local filestorage, returns True if deleting is successfull, otherwise false
def delete_book_file(book, calibrepath):
    # check that path is 2 elements deep, check that target path has no subfolders
    if book.path.count('/') == 1:
        path = os.path.join(calibrepath, book.path)
        if os.path.isdir(path):
            if len(next(os.walk(path))[1]):
                web.app.logger.error(
                    "Deleting book " + str(book.id) + " failed, path has subfolders: " + book.path)
                return False
            shutil.rmtree(path, ignore_errors=True)
            return True
        else:
            web.app.logger.error("Deleting book " + str(book.id) + " failed, book path not valid: " + book.path)
            return False
    else:
        web.app.logger.error("Deleting book " + str(book.id) + " failed, book path value: "+ book.path)
        return False


def update_dir_stucture_file(book_id, calibrepath):
    localbook = db.session.query(db.Books).filter(db.Books.id == book_id).first()
    path = os.path.join(calibrepath, localbook.path)

    authordir = localbook.path.split('/')[0]
    new_authordir = get_valid_filename(localbook.authors[0].name)

    titledir = localbook.path.split('/')[1]
    new_titledir = get_valid_filename(localbook.title) + " (" + str(book_id) + ")"

    if titledir != new_titledir:
        try:
            new_title_path = os.path.join(os.path.dirname(path), new_titledir)
            if not os.path.exists(new_title_path):
                os.renames(path, new_title_path)
            else:
                web.app.logger.info("Copying title: " + path + " into existing: " + new_title_path)
                for dir_name, subdir_list, file_list in os.walk(path):
                    for file in file_list:
                        os.renames(os.path.join(dir_name, file), os.path.join(new_title_path + dir_name[len(path):], file))
            path = new_title_path
            localbook.path = localbook.path.split('/')[0] + '/' + new_titledir
        except OSError as ex:
            web.app.logger.error("Rename title from: " + path + " to " + new_title_path)
            web.app.logger.error(ex, exc_info=True)
            return _('Rename title from: "%s" to "%s" failed with error: %s' % (path, new_title_path, str(ex)))
    if authordir != new_authordir:
        try:
            new_author_path = os.path.join(os.path.join(calibrepath, new_authordir), os.path.basename(path))
            os.renames(path, new_author_path)
            localbook.path = new_authordir + '/' + localbook.path.split('/')[1]
        except OSError as ex:
            web.app.logger.error("Rename author from: " + path + " to " + new_author_path)
            web.app.logger.error(ex, exc_info=True)
            return _('Rename author from: "%s" to "%s" failed with error: %s' % (path, new_title_path, str(ex)))
    return False


def update_dir_structure_gdrive(book_id):
    error = False
    book = db.session.query(db.Books).filter(db.Books.id == book_id).first()

    authordir = book.path.split('/')[0]
    new_authordir = get_valid_filename(book.authors[0].name)
    titledir = book.path.split('/')[1]
    new_titledir = get_valid_filename(book.title) + " (" + str(book_id) + ")"

    if titledir != new_titledir:
        # print (titledir)
        gFile = gd.getFileFromEbooksFolder(os.path.dirname(book.path), titledir)
        if gFile:
            gFile['title'] = new_titledir

            gFile.Upload()
            book.path = book.path.split('/')[0] + '/' + new_titledir
            gd.updateDatabaseOnEdit(gFile['id'], book.path)     # only child folder affected
        else:
            error = _(u'File %s not found on Google Drive' % book.path) # file not found

    if authordir != new_authordir:
        gFile = gd.getFileFromEbooksFolder(os.path.dirname(book.path), titledir)
        if gFile:
            gd.moveGdriveFolderRemote(gFile,new_authordir)
            book.path = new_authordir + '/' + book.path.split('/')[1]
            gd.updateDatabaseOnEdit(gFile['id'], book.path)
        else:
            error = _(u'File %s not found on Google Drive' % authordir) # file not found
    return error


def delete_book_gdrive(book):
    error= False
    gFile = gd.getFileFromEbooksFolder(os.path.dirname(book.path),book.path.split('/')[1])
    if gFile:
        gd.deleteDatabaseEntry(gFile['id'])
        gFile.Trash()
    else:
        error =_(u'Book path %s not found on Google Drive' % book.path)  # file not found
    return error

################################## External interface

def update_dir_stucture(book_id, calibrepath):
    if ub.config.config_use_google_drive:
        return update_dir_structure_gdrive(book_id)
    else:
        return update_dir_stucture_file(book_id, calibrepath)

def delete_book(book, calibrepath):
    if ub.config.config_use_google_drive:
        return delete_book_gdrive(book)
    else:
        return delete_book_file(book, calibrepath)

def get_book_cover(cover_path):
    if ub.config.config_use_google_drive:
        try:
            path=gd.get_cover_via_gdrive(cover_path)
            if path:
                return redirect(path)
            else:
                web.app.logger.error(cover_path + '/cover.jpg not found on Google Drive')
                return send_from_directory(os.path.join(os.path.dirname(__file__), "static"), "generic_cover.jpg")
        except Exception as e:
            web.app.logger.error("Error Message: "+e.message)
            web.app.logger.exception(e)
            # traceback.print_exc()
            return send_from_directory(os.path.join(os.path.dirname(__file__), "static"),"generic_cover.jpg")
    else:
        return send_from_directory(os.path.join(ub.config.config_calibre_dir, cover_path), "cover.jpg")

# saves book cover to gdrive or locally
def save_cover(url, book_path):
    img = requests.get(url)
    if img.headers.get('content-type') != 'image/jpeg':
        web.app.logger.error("Cover is no jpg file, can't save")
        return false

    if ub.config.config_use_google_drive:
        tmpDir = gettempdir()
        f = open(os.path.join(tmpDir, "uploaded_cover.jpg"), "wb")
        f.write(img.content)
        f.close()
        uploadFileToEbooksFolder(os.path.join(book_path, 'cover.jpg'), os.path.join(tmpDir, f.name))
        web.app.logger.info("Cover is saved on gdrive")
        return true

    f = open(os.path.join(ub.config.config_calibre_dir, book_path, "cover.jpg"), "wb")
    f.write(img.content)
    f.close()
    web.app.logger.info("Cover is saved")
    return true

def do_download_file(book, book_format, data, headers):
    if ub.config.config_use_google_drive:
        startTime = time.time()
        df = gd.getFileFromEbooksFolder(book.path, data.name + "." + book_format)
        web.app.logger.debug(time.time() - startTime)
        if df:
            return gd.do_gdrive_download(df, headers)
        else:
            abort(404)
    else:
        response = make_response(send_from_directory(os.path.join(ub.config.config_calibre_dir, book.path), data.name + "." + book_format))
        response.headers = headers
        return response

##################################


class Updater(threading.Thread):

    def __init__(self):
        threading.Thread.__init__(self)
        self.status = 0

    def run(self):
        self.status = 1
        r = requests.get('https://api.github.com/repos/janeczku/calibre-web/zipball/master', stream=True)
        fname = re.findall("filename=(.+)", r.headers['content-disposition'])[0]
        self.status = 2
        z = zipfile.ZipFile(BytesIO(r.content))
        self.status = 3
        tmp_dir = gettempdir()
        z.extractall(tmp_dir)
        self.status = 4
        self.update_source(os.path.join(tmp_dir, os.path.splitext(fname)[0]), ub.config.get_main_dir)
        self.status = 5
        db.session.close()
        db.engine.dispose()
        ub.session.close()
        ub.engine.dispose()
        self.status = 6
        server.Server.setRestartTyp(True)
        server.Server.stopServer()
        self.status = 7

    def get_update_status(self):
        return self.status

    @classmethod
    def file_to_list(self, filelist):
        return [x.strip() for x in open(filelist, 'r') if not x.startswith('#EXT')]

    @classmethod
    def one_minus_two(self, one, two):
        return [x for x in one if x not in set(two)]

    @classmethod
    def reduce_dirs(self, delete_files, new_list):
        new_delete = []
        for filename in delete_files:
            parts = filename.split(os.sep)
            sub = ''
            for part in parts:
                sub = os.path.join(sub, part)
                if sub == '':
                    sub = os.sep
                count = 0
                for song in new_list:
                    if song.startswith(sub):
                        count += 1
                        break
                if count == 0:
                    if sub != '\\':
                        new_delete.append(sub)
                    break
        return list(set(new_delete))

    @classmethod
    def reduce_files(self, remove_items, exclude_items):
        rf = []
        for item in remove_items:
            if not item.startswith(exclude_items):
                rf.append(item)
        return rf

    @classmethod
    def moveallfiles(self, root_src_dir, root_dst_dir):
        change_permissions = True
        if sys.platform == "win32" or sys.platform == "darwin":
            change_permissions = False
        else:
            logging.getLogger('cps.web').debug('Update on OS-System : ' + sys.platform)
            new_permissions = os.stat(root_dst_dir)
            # print new_permissions
        for src_dir, __, files in os.walk(root_src_dir):
            dst_dir = src_dir.replace(root_src_dir, root_dst_dir, 1)
            if not os.path.exists(dst_dir):
                os.makedirs(dst_dir)
                logging.getLogger('cps.web').debug('Create-Dir: '+dst_dir)
                if change_permissions:
                    # print('Permissions: User '+str(new_permissions.st_uid)+' Group '+str(new_permissions.st_uid))
                    os.chown(dst_dir, new_permissions.st_uid, new_permissions.st_gid)
            for file_ in files:
                src_file = os.path.join(src_dir, file_)
                dst_file = os.path.join(dst_dir, file_)
                if os.path.exists(dst_file):
                    if change_permissions:
                        permission = os.stat(dst_file)
                    logging.getLogger('cps.web').debug('Remove file before copy: '+dst_file)
                    os.remove(dst_file)
                else:
                    if change_permissions:
                        permission = new_permissions
                shutil.move(src_file, dst_dir)
                logging.getLogger('cps.web').debug('Move File '+src_file+' to '+dst_dir)
                if change_permissions:
                    try:
                        os.chown(dst_file, permission.st_uid, permission.st_gid)
                    except (Exception) as e:
                        # ex = sys.exc_info()
                        old_permissions = os.stat(dst_file)
                        logging.getLogger('cps.web').debug('Fail change permissions of ' + str(dst_file) + '. Before: '
                            + str(old_permissions.st_uid) + ':' + str(old_permissions.st_gid) + ' After: '
                            + str(permission.st_uid) + ':' + str(permission.st_gid) + ' error: '+str(e))
        return

    def update_source(self, source, destination):
        # destination files
        old_list = list()
        exclude = (
            'vendor' + os.sep + 'kindlegen.exe', 'vendor' + os.sep + 'kindlegen', os.sep + 'app.db',
            os.sep + 'vendor', os.sep + 'calibre-web.log')
        for root, dirs, files in os.walk(destination, topdown=True):
            for name in files:
                old_list.append(os.path.join(root, name).replace(destination, ''))
            for name in dirs:
                old_list.append(os.path.join(root, name).replace(destination, ''))
        # source files
        new_list = list()
        for root, dirs, files in os.walk(source, topdown=True):
            for name in files:
                new_list.append(os.path.join(root, name).replace(source, ''))
            for name in dirs:
                new_list.append(os.path.join(root, name).replace(source, ''))

        delete_files = self.one_minus_two(old_list, new_list)

        rf = self.reduce_files(delete_files, exclude)

        remove_items = self.reduce_dirs(rf, new_list)

        self.moveallfiles(source, destination)

        for item in remove_items:
            item_path = os.path.join(destination, item[1:])
            if os.path.isdir(item_path):
                logging.getLogger('cps.web').debug("Delete dir " + item_path)
                shutil.rmtree(item_path)
            else:
                try:
                    logging.getLogger('cps.web').debug("Delete file " + item_path)
                    # log_from_thread("Delete file " + item_path)
                    os.remove(item_path)
                except Exception:
                    logging.getLogger('cps.web').debug("Could not remove:" + item_path)
        shutil.rmtree(source, ignore_errors=True)