# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4


from datetime import datetime
from io import StringIO, BytesIO
from PIL import Image
import base64
import hashlib
import json
import os
import re
import socket
import stdnum.isbn
import subprocess
import sys
import time

import ox
from OpenSSL.crypto import (
    load_privatekey, load_certificate,
    dump_privatekey, dump_certificate,
    FILETYPE_ASN1, FILETYPE_PEM, PKey, TYPE_RSA,
    X509, X509Extension
)
from Crypto.PublicKey import RSA
from Crypto.Util.asn1 import DerSequence


from meta.utils import normalize_isbn, find_isbns, get_language, to_isbn13
from win32utils import get_short_path_name

import logging
logging.getLogger('PIL').setLevel(logging.ERROR)
logger = logging.getLogger(__name__)

ENCODING = 'base64'

def valid_olid(id):
    return id.startswith('OL') and id.endswith('M')

def get_positions(ids, pos):
    '''
    >>> get_positions([1,2,3,4], [2,4])
    {2: 1, 4: 3}
    '''
    positions = {}
    for i in pos:
        try:
            positions[i] = ids.index(i)
        except:
            pass
    return positions

def get_by_key(objects, key, value):
    obj = [o for o in objects if o.get(key) == value]
    return obj and obj[0] or None

def get_by_id(objects, id):
    return get_by_key(objects, 'id', id)

def is_svg(data):
    return data and b'<svg' in data[:256]

def resize_image(data, width=None, size=None):
    if isinstance(data, bytes):
        data = BytesIO(data)
    else:
        data = StringIO(data)
    source = Image.open(data)
    #if source.mode not in ('1', 'CMYK', 'L', 'RGB', 'RGBA', 'RGBX', 'YCbCr'):
    source = source.convert('RGB')
    source_width = source.size[0]
    source_height = source.size[1]
    if size:
        if source_width > source_height:
            width = size
            height = int(width / (float(source_width) / source_height))
            height = height - height % 2
        else:
            height = size
            width = int(height * (float(source_width) / source_height))
            width = width - width % 2

    else:
        height = int(width / (float(source_width) / source_height))
        height = height - height % 2

    width = max(width, 1)
    height = max(height, 1)

    if width < source_width:
        resize_method = Image.ANTIALIAS
    else:
        resize_method = Image.BICUBIC
    output = source.resize((width, height), resize_method)
    o = BytesIO()
    output.save(o, format='jpeg')
    data = o.getvalue()
    o.close()
    return data

def sort_title(title):

    title = title.replace('Æ', 'Ae')
    if isinstance(title, str):
        title = str(title)
    title = ox.sort_string(title)

    #title
    title = re.sub('[\'!¿¡,\.;\-"\:\*\[\]]', '', title)
    return title.strip()

def get_position_by_id(list, key):
    for i in range(0, len(list)):
        if list[i]['id'] == key:
            return i
    return -1

def get_user_id(private_key, cert_path):
    if os.path.exists(private_key):
        with open(private_key) as fd:
            key = load_privatekey(FILETYPE_PEM, fd.read())
        if key.bits() != 1024:
            os.unlink(private_key)
        else:
            user_id = get_service_id(private_key)
    if not os.path.exists(private_key):
        if os.path.exists(cert_path):
            os.unlink(cert_path)
        folder = os.path.dirname(private_key)
        if not os.path.exists(folder):
            os.makedirs(folder)
            os.chmod(folder, 0o700)
        key = PKey()
        key.generate_key(TYPE_RSA, 1024)
        with open(private_key, 'wb') as fd:
            os.chmod(private_key, 0o600)
            fd.write(dump_privatekey(FILETYPE_PEM, key))
            os.chmod(private_key, 0o400)
        user_id = get_service_id(private_key)
    if not os.path.exists(cert_path):
        ca = X509()
        ca.set_version(2)
        ca.set_serial_number(1)
        ca.get_subject().CN = user_id
        ca.gmtime_adj_notBefore(0)
        ca.gmtime_adj_notAfter(24 * 60 * 60)
        ca.set_issuer(ca.get_subject())
        ca.set_pubkey(key)
        ca.add_extensions([
          X509Extension(b"basicConstraints", True, b"CA:TRUE, pathlen:0"),
          X509Extension(b"nsCertType", True, b"sslCA"),
          X509Extension(b"extendedKeyUsage", True,
            b"serverAuth,clientAuth,emailProtection,timeStamping,msCodeInd,msCodeCom,msCTLSign,msSGC,msEFS,nsSGC"),
          X509Extension(b"keyUsage", False, b"keyCertSign, cRLSign"),
          X509Extension(b"subjectKeyIdentifier", False, b"hash", subject=ca),
        ])
        ca.sign(key, "sha256")
        with open(cert_path, 'wb') as fd:
            fd.write(dump_certificate(FILETYPE_PEM, ca))
    return user_id

def get_service_id(private_key_file=None, cert=None):
    '''
    service_id is the first half of the sha1 of the rsa public key encoded in base32
    '''
    if private_key_file:
        with open(private_key_file, 'rb') as fd:
            private_key = fd.read()
        public_key = RSA.importKey(private_key).publickey().exportKey('DER')[22:]
        # compute sha1 of public key and encode first half in base32
        service_id = base64.b32encode(hashlib.sha1(public_key).digest()[:10]).lower().decode()
        '''
        # compute public key from priate key and export in DER format
        # ignoring the SPKI header(22 bytes)
        key = load_privatekey(FILETYPE_PEM, private_key)
        cert = X509()
        cert.set_pubkey(key)
        public_key = dump_privatekey(FILETYPE_ASN1, cert.get_pubkey())[22:]
        # compute sha1 of public key and encode first half in base32
        service_id = base64.b32encode(hashlib.sha1(public_key).digest()[:10]).lower().decode()
        '''
    elif cert:
        # compute sha1 of public key and encode first half in base32
        key = load_certificate(FILETYPE_ASN1, cert).get_pubkey()
        pub_der = DerSequence()
        pub_der.decode(dump_privatekey(FILETYPE_ASN1, key))
        public_key = RSA.construct((pub_der._seq[1], pub_der._seq[2])).exportKey('DER')[22:]
        service_id = base64.b32encode(hashlib.sha1(public_key).digest()[:10]).lower().decode()
    return service_id

def update_dict(root, data):
    for key in data:
        keys = [part.replace('\0', '.') for part in key.replace('\\.', '\0').split('.')]
        value = data[key]
        p = root
        while len(keys)>1:
            key = keys.pop(0)
            if isinstance(p, list):
                p = p[get_position_by_id(p, key)]
            else:
                if key not in p:
                    p[key] = {}
                p = p[key]
        if value == None and keys[0] in p:
            del p[keys[0]]
        else:
            p[keys[0]] = value
    if hasattr(root, '_save'):
        root._save()

def remove_empty_folders(prefix, keep_root=False):
    empty = []
    for root, folders, files in os.walk(prefix):
        if len(files) == 1 and files[0] == '.DS_Store':
            os.unlink(os.path.join(root, files[0]))
            files = []
        if not folders and not files:
            if root != prefix or not keep_root:
                empty.append(root)
    for folder in empty:
        remove_empty_tree(folder)

def remove_empty_tree(leaf):
    while leaf:
        if not os.path.exists(leaf):
            leaf = os.path.dirname(leaf)
        elif os.path.isdir(leaf) and not os.listdir(leaf):
            logger.debug('rmdir %s', leaf)
            os.rmdir(leaf)
        else:
            break

try:
    utc_0 = int(time.mktime(datetime(1970, 1, 1).timetuple()))
except:
    utc_0 = int(time.mktime(time.gmtime()) - time.mktime(time.localtime()))

def datetime2ts(dt):
    return int(time.mktime(dt.utctimetuple())) - utc_0

def ts2datetime(ts):
    return datetime.utcfromtimestamp(float(ts))

def run(*cmd):
    p = subprocess.Popen(cmd, close_fds=True)
    p.wait()
    return p.returncode

def get(*cmd):
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    stdout, error = p.communicate()
    return stdout.decode()

def makefolder(path):
    dirname = os.path.dirname(path)
    if not os.path.exists(dirname):
        os.makedirs(dirname)


def open_file(path=None):
    cmd = []
    if sys.platform == 'darwin':
        cmd += ['open', path]
    elif sys.platform.startswith('linux'):
        cmd += ['xdg-open', path]
    elif sys.platform == 'win32':
        path = '\\'.join(path.split('/'))
        os.startfile(path)
        cmd = []
    else:
        logger.debug('unsupported platform %s', sys.platform)
    if cmd:
        subprocess.Popen(cmd, close_fds=True)

def open_folder(folder=None, path=None):
    cmd = []
    if path and not folder:
        folder = os.path.dirname(path)
    if folder and not path:
        path = folder
    if sys.platform == 'darwin':
        if folder and not path:
            path = folder
        cmd += ['open', '-R', path]
    elif sys.platform.startswith('linux'):
        cmd += ['xdg-open', folder]
    elif sys.platform == 'win32':
        path = '\\'.join(path.split('/'))
        cmd = 'explorer.exe /select,"%s"' % path
    else:
        logger.debug('unsupported platform %s', sys.platform)
    if cmd:
        subprocess.Popen(cmd, close_fds=True)

def can_connect_dns(host="8.8.8.8", port=53):
    """
        host: 8.8.8.8 (google-public-dns-a.google.com)
        port: 53/tcp
    """
    import socks
    import state
    try:
        sock = socks.socksocket(socket.AF_INET, socket.SOCK_STREAM, 6)
        sock.settimeout(2)
        socks_port = state.tor.socks_port if state.tor else 9150
        sock.set_proxy(socks.SOCKS5, "localhost", socks_port, True)
        sock.connect((host, port))
        return True
    except:
        #logger.debug('failed to connect', exc_info=True)
        pass
    return False

def _to_json(python_object):
    if isinstance(python_object, datetime):
        if python_object.year < 1900:
            tt = python_object.timetuple()
            return '%d-%02d-%02dT%02d:%02d%02dZ' % tuple(list(tt)[:6])
        return python_object.strftime('%Y-%m-%dT%H:%M:%SZ')
    raise TypeError(u'%s %s is not JSON serializable' % (repr(python_object), type(python_object)))

def get_ratio(data):
    try:
        img = Image.open(BytesIO(data))
        return img.size[0]/img.size[1]
    except:
        return 1


def get_meta_hash(data):
    data = data.copy()
    if 'sharemetadata' in data:
        del data['sharemetadata']
    for key in list(data):
        if not data[key]:
            del data[key]
    return hashlib.sha1(json.dumps(data,
        ensure_ascii=False, sort_keys=True).encode()).hexdigest()


def update_static():
    import settings
    import os
    import ox
    path = os.path.join(settings.static_path, 'js')
    files = sorted([
        file for file in os.listdir(path)
        if not file.startswith('.')
        and not file.startswith('oml.')
    ])
    ox.file.write_json(os.path.join(settings.static_path, 'json', 'js.json'), files, indent=4)
    ox.file.write_file(
        os.path.join(path, 'oml.min.js'),
        '\n'.join([
            ox.js.minify(ox.file.read_file(os.path.join(path, file)).decode('utf-8'))
            for file in files
        ])
    )

def check_pid(pid):
    try:
        os.kill(pid, 0)
    except:
        return False
    else:
        return True

def check_pidfile(pid):
    try:
        with open(pid) as fd:
            pid = int(fd.read())
    except:
        return False
    return check_pid(pid)

def ctl(*args):
    import settings
    if sys.platform == 'win32':
        platform_win32 = os.path.normpath(os.path.join(settings.base_dir, '..', 'platform_win32'))
        python = os.path.join(platform_win32, 'pythonw.exe')
        cmd = [python, 'oml'] + list(args)
        startupinfo = subprocess.STARTUPINFO()
        startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
        startupinfo.wShowWindow = subprocess.SW_HIDE
        subprocess.Popen(cmd, cwd=settings.base_dir, start_new_session=True, startupinfo=startupinfo)
    else:
        subprocess.Popen([os.path.join(settings.base_dir, 'ctl')] + list(args),
            close_fds=True, start_new_session=True)

def user_sort_key(u):
    return ox.sort_string(str(u.get('index', '')) + 'Z' + (u.get('name') or ''))

def get_peer(peerid):
    import state
    import library
    if peerid not in state.peers:
        state.peers[peerid] = library.Peer(peerid)
    return state.peers[peerid]

def send_debug():
    import settings
    import tor_request
    import gzip
    import io
    url = 'http://rnogx24drkbnrxa3.onion/debug'
    headers = {
        'User-Agent': settings.USER_AGENT,
    }
    debug_log = os.path.join(settings.data_path, 'debug.log')
    last_debug = settings.server.get('last_debug')
    old = last_debug is not None
    try:
        if os.path.exists(debug_log):
            data = []
            with open(debug_log, 'r') as fd:
                for line in fd:
                    t = line.split(':DEBUG')[0]
                    if t.count('-') == 2:
                        timestamp = t
                        if old and timestamp > last_debug:
                            old = False
                    if not old:
                        data.append(line)
                data = ''.join(data)
            if data:
                bytes_io = io.BytesIO()
                gzip_file = gzip.GzipFile(fileobj=bytes_io, mode='wb')
                gzip_file.write(data.encode())
                gzip_file.close()
                result = bytes_io.getvalue()
                bytes_io.close()
                opener = tor_request.get_opener()
                opener.addheaders = list(zip(headers.keys(), headers.values()))
                r = opener.open(url, result)
                if r.status != 200:
                    logger.debug('failed to send debug information')
                else:
                    settings.server['last_debug'] = timestamp
    except:
        logger.debug('failed to send debug information')

def iexists(path):
    parts = path.split(os.sep)
    name = parts[-1].lower()
    if len(parts) == 1:
        folder = '.'
    else:
        folder = os.path.dirname(path)
    try:
        files = os.listdir(folder)
    except FileNotFoundError:
        return False
    files = {os.path.basename(f).lower() for f in files}
    return name in files