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

import db
import ub
from flask import current_app as app
import logging
import smtplib
from tempfile import gettempdir
import socket
import sys
import os
import traceback
import re
import unicodedata
from StringIO import StringIO
from email import encoders
from email.MIMEBase import MIMEBase
from email.MIMEMultipart import MIMEMultipart
from email.MIMEText import MIMEText
from email.generator import Generator
from flask_babel import gettext as _
import subprocess
import threading
import shutil
import requests
import zipfile
from tornado.ioloop import IOLoop

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

# Global variables
global_task = None
updater_thread = None

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):
    vendorpath = os.path.join(os.path.normpath(os.path.dirname(os.path.realpath(__file__)) +
                                               os.sep + "../vendor" + os.sep))
    if sys.platform == "win32":
        kindlegen = os.path.join(vendorpath, u"kindlegen.exe")
    else:
        kindlegen = os.path.join(vendorpath, u"kindlegen")
    if not os.path.exists(kindlegen):
        app.logger.error("make_mobi: kindlegen binary not found in: %s" % kindlegen)
        return None
    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:
        app.logger.error("make_mobi: epub format not found for book id: %d" % book_id)
        return None

    file_path = os.path.join(calibrepath, book.path, data.name)
    if os.path.exists(file_path + u".epub"):
        p = subprocess.Popen((kindlegen + " \"" + file_path + u".epub\" ").encode(sys.getfilesystemencoding()),
                             shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
        # Poll process for new output until finished
        while True:
            nextline = p.stdout.readline()
            if nextline == '' and p.poll() is not None:
                break
            if nextline != "\r\n":
                app.logger.debug(nextline.strip('\r\n'))

        check = p.returncode
        if not check or check < 2:
            book.data.append(db.Data(
                    name=book.data[0].name,
                    format="MOBI",
                    book=book.id,
                    uncompressed_size=os.path.getsize(file_path + ".mobi")
                ))
            db.session.commit()
            return file_path + ".mobi"
        else:
            app.logger.error("make_mobi: kindlegen failed with error while converting book")
            return None
    else:
        app.logger.error("make_mobie: epub not found: %s.epub" % file_path)
        return None


class StderrLogger(object):

    buffer = ''

    def __init__(self):
        self.logger = logging.getLogger('cps.web')

    def write(self, message):
        if message == '\n':
            self.logger.debug(self.buffer)
            self.buffer = ''
        else:
            self.buffer += message


def send_raw_email(kindle_mail, msg):
    settings = ub.get_mail_settings()

    msg['From'] = settings["mail_from"]
    msg['To'] = kindle_mail

    use_ssl = int(settings.get('mail_use_ssl', 0))

    # convert MIME message to string
    fp = StringIO()
    gen = Generator(fp, mangle_from_=False)
    gen.flatten(msg)
    msg = fp.getvalue()

    # send email
    try:
        timeout = 600     # set timeout to 5mins

        org_stderr = smtplib.stderr
        smtplib.stderr = StderrLogger()

        if use_ssl == 2:
            mailserver = smtplib.SMTP_SSL(settings["mail_server"], settings["mail_port"], timeout)
        else:
            mailserver = smtplib.SMTP(settings["mail_server"], settings["mail_port"], timeout)
        mailserver.set_debuglevel(1)

        if use_ssl == 1:
            mailserver.starttls()

        if settings["mail_password"]:
            mailserver.login(settings["mail_login"], settings["mail_password"])
        mailserver.sendmail(settings["mail_login"], kindle_mail, msg)
        mailserver.quit()

        smtplib.stderr = org_stderr

    except (socket.error, smtplib.SMTPRecipientsRefused, smtplib.SMTPException), e:
        app.logger.error(traceback.print_exc())
        return _("Failed to send mail: %s" % str(e))

    return None


def send_test_mail(kindle_mail):
    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'))
    return send_raw_email(kindle_mail, msg)


def send_mail(book_id, kindle_mail, calibrepath):
    """Send email with attachments"""
    # create MIME message
    msg = MIMEMultipart()
    msg['Subject'] = _(u'Send to Kindle')
    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)

    formats = {}

    for entry in data:
        if entry.format == "MOBI":
            formats["mobi"] = os.path.join(calibrepath, book.path, entry.name + ".mobi")
        if entry.format == "EPUB":
            formats["epub"] = os.path.join(calibrepath, book.path, entry.name + ".epub")
        if entry.format == "PDF":
            formats["pdf"] = os.path.join(calibrepath, book.path, entry.name + ".pdf")

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

    if 'mobi' in formats:
        msg.attach(get_attachment(formats['mobi']))
    elif 'epub' in formats:
        filepath = make_mobi(book.id, calibrepath)
        if filepath is not None:
            msg.attach(get_attachment(filepath))
        elif filepath is None:
            return _("Could not convert epub to mobi")
        elif 'pdf' in formats:
            msg.attach(get_attachment(formats['pdf']))
    elif 'pdf' in formats:
        msg.attach(get_attachment(formats['pdf']))
    else:
        return _("Could not find any formats suitable for sending by email")

    return send_raw_email(kindle_mail, msg)


def get_attachment(file_path):
    """Get file as MIMEBase message"""

    try:
        file_ = open(file_path, 'rb')
        attachment = MIMEBase('application', 'octet-stream')
        attachment.set_payload(file_.read())
        file_.close()
        encoders.encode_base64(attachment)

        attachment.add_header('Content-Disposition', 'attachment',
                              filename=os.path.basename(file_path))
        return attachment
    except IOError:
        traceback.print_exc()
        app.logger.error = (u'The requested file could not be read. Maybe wrong permissions?')
        return None


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'_'
    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)
        value = unicode(re_slugify.sub('', value).strip())
    if replace_whitespace:
        #*+:\"/<>? werden durch _ ersetzt
        value = re.sub('[\*\+:\\\"/<>\?]+', u'_', value, flags=re.U)

    value = value[:128]
    return value

def get_sorted_author(value):
    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])
    return value2


def update_dir_stucture(book_id, calibrepath):
    db.session.connection().connection.connection.create_function("title_sort", 1, db.title_sort)
    book = db.session.query(db.Books).filter(db.Books.id == book_id).first()
    path = os.path.join(calibrepath, book.path)#.replace('/',os.path.sep)).replace('\\',os.path.sep)
    
    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:
        new_title_path = os.path.join(os.path.dirname(path), new_titledir)
        os.rename(path, new_title_path)
        path = new_title_path
        book.path = book.path.split('/')[0] + '/' + new_titledir
    
    if authordir != new_authordir:
        new_author_path = os.path.join(os.path.join(calibrepath, new_authordir), os.path.basename(path))
        os.renames(path, new_author_path)
        book.path = new_authordir + '/' + book.path.split('/')[1]
    db.session.commit()

class Updater(threading.Thread):

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

    def run(self):
        global global_task
        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(StringIO(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
        global_task = 0
        db.session.close()
        db.engine.dispose()
        ub.session.close()
        ub.engine.dispose()
        self.status=6
        # stop tornado server
        server = IOLoop.instance()
        server.add_callback(server.stop)
        self.status=7

    def get_update_status(self):
        return self.status

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

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

    def reduce_dirs(self, delete_files, new_list):
        new_delete = []
        for file in delete_files:
            parts = file.split(os.sep)
            sub = ''
            for i in range(len(parts)):
                sub = os.path.join(sub, parts[i])
                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))

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

    def moveallfiles(self, root_src_dir, root_dst_dir):
        change_permissions = True
        if sys.platform == "win32" or sys.platform == "darwin":
            change_permissions = False
        else:
            app.logger.debug('Update on OS-System : ' + sys.platform)
            # print('OS-System: '+sys.platform )
            new_permissions = os.stat(root_dst_dir)
            # print new_permissions
        for src_dir, dirs, 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)
                # print('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)
                    # print('Remove file before copy: '+dst_file)
                    os.remove(dst_file)
                else:
                    if change_permissions:
                        permission = new_permissions
                shutil.move(src_file, dst_dir)
                # print('Move File '+src_file+' to '+dst_dir)
                if change_permissions:
                    try:
                        os.chown(dst_file, permission.st_uid, permission.st_uid)
                        # print('Permissions: User '+str(new_permissions.st_uid)+' Group '+str(new_permissions.st_uid))
                    except:
                        e = sys.exc_info()
                        # print('Fail '+str(dst_file)+' 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', '/app.db', 'vendor', '/update.py'])
        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):
                app.logger.debug("Delete dir " + item_path)
                shutil.rmtree(item_path)
            else:
                try:
                    app.logger.debug("Delete file " + item_path)
                    os.remove(item_path)
                except:
                    app.logger.debug("Could not remove:" + item_path)
        shutil.rmtree(source, ignore_errors=True)