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

from contextlib import closing
import base64
import json
import os
import tarfile
from threading import Thread
import urllib.request
import urllib.error
import urllib.parse
import shutil
import subprocess
import sys
import time

import OpenSSL.crypto
import ox
from oxtornado import actions
from sqlalchemy.sql.expression import text

import settings
import utils
import db
from integration import get_trayicon_version

import logging

logger = logging.getLogger(__name__)


ENCODING = 'base64'

def verify(release):
    verified = False
    value = []
    for module in sorted(release['modules']):
        value += [str('%s/%s' % (release['modules'][module]['version'], release['modules'][module]['sha1']))]
    value = '\n'.join(value)
    value = value.encode()
    for digest in ('sha512', 'sha256', 'sha1'):
        if 'signature_%s'%digest in release:
            tls_sig = base64.b64decode(release['signature_%s'%digest].encode())
            cert = OpenSSL.crypto.load_certificate(OpenSSL.crypto.FILETYPE_PEM, settings.OML_UPDATE_CERT)
            try:
                OpenSSL.crypto.verify(cert, tls_sig, value, digest)
                verified = True
            except OpenSSL.crypto.Error:
                logger.debug('invalid tls signature')
                verified = False
            break
    if 'signature' in release and not verified:
        import ed25519
        vk = ed25519.VerifyingKey(settings.OML_UPDATE_KEY, encoding=ENCODING)
        sig = release['signature'].encode()
        try:
            vk.verify(sig, value, encoding=ENCODING)
            verified = True
        except ed25519.BadSignatureError:
            verified = False
    return verified

def get(url, filename=None):
    request = urllib.request.Request(url, headers={
        'User-Agent': settings.USER_AGENT
    })
    with closing(urllib.request.urlopen(request)) as u:
        if not filename:
            data = u.read()
            return data
        else:
            dirname = os.path.dirname(filename)
            if dirname and not os.path.exists(dirname):
                os.makedirs(dirname)
            with open(filename, 'wb') as fd:
                data = u.read(4096)
                while data:
                    fd.write(data)
                    data = u.read(4096)

def check():
    if settings.release:
        release_data = get(settings.server.get('release_url',
            'http://downloads.openmedialibrary.com/release.json'))
        release = json.loads(release_data.decode('utf-8'))
        old = current_version('openmedialibrary')
        new = release['modules']['openmedialibrary']['version']
        return verify(release) and old < new
    return False

def current_version(module):
    if 'modules' in settings.release \
        and module in settings.release['modules'] \
        and 'version' in settings.release['modules'][module]:
        version = settings.release['modules'][module]['version']
    else:
        version = ''
    return version

def get_latest_release():
    try:
        release_data = get(settings.server.get('release_url'))
        release = json.loads(release_data.decode('utf-8'))
        if verify(release):
            ox.makedirs(settings.updates_path)
            with open(os.path.join(settings.updates_path, 'release.json'), 'wb') as fd:
                fd.write(release_data)
            return release
    except:
        logger.debug('failed to get latest release')

def get_platform():
    name = sys.platform
    if name.startswith('darwin'):
        name = 'darwin64'
    elif name.startswith('linux'):
        import platform
        machine = platform.machine()
        if machine == 'armv7l':
            name = 'linux_armv7l'
        elif machine == 'aarch64':
            name = 'linux_aarch64'
        elif machine == 'x86_64':
            name = 'linux64'
        else:
            name = 'linux32'
    return name

def download():
    if not os.path.exists(os.path.join(settings.data_path, 'release.json')):
        return True
    release = get_latest_release()
    platform = get_platform()
    if release:
        ox.makedirs(settings.updates_path)
        os.chdir(os.path.dirname(settings.base_dir))
        current_files = {'release.json'}
        for module in release['modules']:
            module_tar = os.path.join(settings.updates_path, release['modules'][module]['name'])
            if release['modules'][module].get('platform', platform) == platform and \
                    release['modules'][module]['version'] > current_version(module):
                base_url = settings.server.get('release_url').rsplit('/', 1)[0]
                url = '/'.join([base_url, release['modules'][module]['name']])
                if not os.path.exists(module_tar):
                    logger.debug('download %s', os.path.basename(module_tar))
                    get(url, module_tar)
                    if ox.sha1sum(module_tar) != release['modules'][module]['sha1']:
                        logger.debug('invalid checksum %s', os.path.basename(module_tar))
                        os.unlink(module_tar)
                        return False
            current_files.add(os.path.basename(module_tar))
        for f in set(next(os.walk(settings.updates_path))[2])-current_files:
            os.unlink(os.path.join(settings.updates_path, f))
        return True
    return True

def install():
    if not os.path.exists(os.path.join(settings.updates_path, 'release.json')):
        return True
    if not os.path.exists(os.path.join(settings.data_path, 'release.json')):
        return True
    with open(os.path.join(settings.updates_path, 'release.json')) as fd:
        release = json.load(fd)
    old_version = current_version('openmedialibrary')
    new_version = release['modules']['openmedialibrary']['version']
    if verify(release) and old_version < new_version:
        base = os.path.dirname(settings.base_dir)
        os.chdir(base)
        platform = get_platform()
        for module in release['modules']:
            if release['modules'][module].get('platform', platform) == platform and \
                    release['modules'][module]['version'] > current_version(module):
                module_tar = os.path.join(settings.updates_path, release['modules'][module]['name'])
                if os.path.exists(module_tar) and ox.sha1sum(module_tar) == release['modules'][module]['sha1']:
                    #tar fails if old platform is moved before extract
                    new = '%s_new' % module
                    ox.makedirs(new)
                    os.chdir(new)
                    tar = tarfile.open(module_tar)
                    tar.extractall()
                    tar.close()
                    os.chdir(base)
                    module_old = '%s_old' % module
                    if os.path.exists(module_old):
                        rmtree(module_old)
                    if os.path.exists(module):
                        move(module, module_old)
                    move(os.path.join(new, module), module)
                    if platform != 'win32' and os.path.exists(module_old):
                        rmtree(module_old)
                    rmtree(new)
                else:
                    if os.path.exists(module_tar):
                        os.unlink(module_tar)
                    return False
        shutil.copy(os.path.join(settings.updates_path, 'release.json'), os.path.join(settings.data_path, 'release.json'))
        upgrade_app()
        # FIXME: still needed?
        if old_version < '20160112-651-de984a3':
            subprocess.call(['./ctl', 'postupdate', '-o', old_version, '-n', new_version])
        return True
    return True

def move(src, dst):
    try:
        shutil.move(src, dst)
    except:
        logger.debug('failed to move %s to %s', src, dst)
        raise

def rmtree(path):
    try:
        shutil.rmtree(path)
    except:
        logger.debug('failed to remove %s', path)
        raise

def update_available():
    db_version = settings.server.get('db_version', 0)
    if db_version < settings.DB_VERSION:
        return True
    if not os.path.exists(os.path.join(settings.updates_path, 'release.json')):
        return False
    if not os.path.exists(os.path.join(settings.data_path, 'release.json')):
        return False
    with open(os.path.join(settings.updates_path, 'release.json')) as fd:
        release = json.load(fd)
    old_version = current_version('openmedialibrary')
    new_version = release['modules']['openmedialibrary']['version']
    return verify(release) and old_version < new_version

def restart_oml(update=False):
    if update:
        get_latest_release()
    utils.ctl('restart')

def get_app_version(app):
    plist = app + '/Contents/Info.plist'
    if os.path.exists(plist):
        cmd = ['defaults', 'read', plist, 'CFBundleShortVersionString']
        return subprocess.check_output(cmd).strip()

def upgrade_app():
    base = os.path.dirname(settings.base_dir)
    if sys.platform == 'darwin':
        bundled_app = os.path.join(base, 'platform_darwin64/Applications/Open Media Library.app')
        app = '/Applications/Open Media Library.app'
        version = get_app_version(app)
        current_version = get_app_version(bundled_app)
        if version and current_version and version != current_version:
            try:
                shutil.rmtree(app)
                shutil.copytree(bundled_app, app)
            except:
                logger.debug('Failed to update Application', exc_info=True)
    elif sys.platform == 'win32':
        current_version = get_trayicon_version()
        if current_version != '0.2.0.0':
            msi = os.path.normpath(os.path.join(base, 'platform_win32', 'Open Media Library.msi'))
            cmd = ['msiexec.exe', '/qb', '/I', msi]
            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)

def getVersion(data):
    '''
        check if new version is available
    '''
    response = {
        'current': settings.MINOR_VERSION,
        'version': settings.MINOR_VERSION,
        'upgrade': False,
    }
    if settings.MINOR_VERSION == 'git':
        '''
        cmd = ['git', 'rev-parse', '@']
        p = subprocess.Popen(cmd, stdout=subprocess.PIPE, close_fds=True)
        stdout, stderr = p.communicate()
        current = stdout.strip()
        cmd = ['git', 'ls-remote', 'origin', '-h', 'refs/heads/master']
        p = subprocess.Popen(cmd, stdout=subprocess.PIPE, close_fds=True)
        stdout, stderr = p.communicate()
        new = stdout.strip()[:40]
        response['update'] = len(new) == 40 and current != new
        '''
        response['update'] = False
    else:
        get_latest_release()
        if not os.path.exists(os.path.join(settings.updates_path, 'release.json')):
            return response
        if not os.path.exists(os.path.join(settings.data_path, 'release.json')):
            return response
        with open(os.path.join(settings.updates_path, 'release.json')) as fd:
            release = json.load(fd)
        current = current_version('openmedialibrary')
        response['current'] = current
        new = release['modules']['openmedialibrary']['version']
        response['version'] = new
        response['update'] = current < new
    return response
actions.register(getVersion, cache=False)

def restart(data):
    '''
        restart (and upgrade if upgrades are available)
    '''
    restart_oml(data.get('update'))
    return {}
actions.register(restart, cache=False)


class Update(Thread):
    _status = {
        'reload': False,
        'status': 'Updating Open Media Library...'
    }

    def __init__(self):
        Thread.__init__(self)
        self.daemon = True
        self.start()

    def status(self, status, reload=False):
        from websocket import trigger_event
        self._status = {
            'reload': reload,
            'status': status,
        }
        trigger_event('updatestatus', self._status)

    def install(self):
        while update_available():
            self.status('Downloading...')
            max_retry = 5
            while max_retry > 0 and not download():
                max_retry -= 1
                self.status('Download failed, retrying...')
                time.sleep(5)
                self.status('Downloading...')
            self.status('Installing...')
            if not install():
                self.status('Installation failed.')
            return True
        return False

    def update_database(self):
        db_version = settings.server.get('db_version', 0)
        if db_version < settings.DB_VERSION:
            self.status('Updating...')
            if db_version < 3:
                db_version = migrate_3()
            if db_version < 4:
                db_version = migrate_4()
            if db_version < 5:
                db_version = migrate_5()
            if db_version < 6:
                db_version = migrate_6()
            if db_version < 7:
                db_version = migrate_7()
            if db_version < 9:
                db_version = migrate_8()
            if db_version < 10:
                db_version = migrate_10()
            if db_version < 11:
                db_version = migrate_11()
            if db_version < 12:
                db_version = migrate_12()
            if db_version < 13:
                db_version = migrate_13()
            settings.server['db_version'] = settings.DB_VERSION

    def run(self):
        self.status('Checking for updates...')
        self.update_database()
        if self.install():
            restart_oml()
            return
        self.status('Relaunching...', True)
        restart_oml()


def migrate_3():
    with db.session():
        import item.models
        for i in item.models.Item.find({
            'query': {
                'conditions': [{
                    'key':'mediastate',
                    'value':'available',
                    'operator': '=='
                }]
            }
        }):
            if not i.files.all():
                i.remove_file()
            else:
                f = i.files.all()[0]
                if not 'pages' in i.info and 'pages' in f.info:
                    i.info['pages'] = f.info['pages']
                    i.save()
    return 3

def migrate_4():
    with db.session() as session:
        import item.models
        from meta.utils import to_isbn13
        for i in item.models.Item.query:
            update = False
            if 'isbn' in i.meta and isinstance(i.meta['isbn'], list):
                isbns = [to_isbn13(isbn) for isbn in i.meta['isbn']]
                isbns = [isbn for isbn in isbns if isbn]
                if isbns:
                    i.meta['isbn'] = isbns[0]
                    if 'isbn' in i.info:
                        i.info['isbn'] = i.meta['isbn']
                else:
                    del i.meta['isbn']
                    if 'isbn' in i.info:
                        del i.info['isbn']
                update = True
            if 'isbn' in i.meta and not i.meta['isbn']:
                del i.meta['isbn']
                update = True
            if update:
                session.add(i)
        session.commit()
    return 4

def migrate_5():
    db.run_sql([
        'DROP INDEX IF EXISTS user_metadata_index',
        'CREATE UNIQUE INDEX user_metadata_index ON user_metadata(item_id, user_id)',
        'UPDATE sort SET sharemetadata = 0',
    ]),
    with db.session() as session:
        import user.models
        for m in user.models.Metadata.query:
            data_hash = m.get_hash()
            if m.data_hash != data_hash:
                m.data_hash = data_hash
                session.add(m)
        session.commit()
        import item.models
        for i in item.models.Item.query:
            update = False
            if '_from' in i.info:
                del i.info['_from']
                update = True
            if update:
                session.add(i)
        session.commit()
        for i in item.models.Item.query:
            i.sync_metadata()
    return 5

def migrate_6():
    with db.session() as session:
        import item.models
        for s in item.models.Sort.query.filter_by(author=''):
            s.item.update_sort()
        for s in item.models.Sort.query.filter_by(publisher=''):
            s.item.update_sort()
        for s in item.models.Sort.query.filter_by(language=''):
            s.item.update_sort()
        for s in item.models.Sort.query.filter_by(place=''):
            s.item.update_sort()
        for s in item.models.Sort.query.filter_by(isbn=''):
            s.item.update_sort()
        for s in item.models.Sort.query.filter_by(date=''):
            s.item.update_sort()
        session.commit()
    return 6

def migrate_7():
    with db.session() as session:
        import changelog
        for c in changelog.Changelog.query:
            if 'editmeta' in c.data or 'resetmeta' in c.data:
                session.delete(c)
        session.commit()
    db.run_sql('DROP TABLE IF EXISTS metadata')
    db.run_sql('DROP TABLE IF EXISTS scrape')
    db.run_sql('VACUUM')
    return 7

def migrate_8():
    for key in ('directory_service', 'meta_service', 'local_lookup', 'cert'):
        if key in settings.server:
            del settings.server[key]
    list_cache = os.path.join(settings.data_path, 'list_cache.json')
    if os.path.exists(list_cache):
        os.unlink(list_cache)
    with db.session() as session:
        import item.models
        for i in item.models.Item.query:
            delta = set(i.meta)-set(i.meta_keys)
            if delta:
                for key in delta:
                    del i.meta[key]
                session.add(i)
        session.commit()
        import changelog
        import user.models
        changelog.Changelog.query.delete()
        u = user.models.User.get(settings.USER_ID)
        u.rebuild_changelog()
        for peer in user.models.User.query:
            if peer.id != u.id:
                if len(peer.id) != 16:
                    session.delete(peer)
        session.commit()
    return 8

def migrate_10():
    with db.session() as session:
        from item.models import Item, Find
        from utils import get_by_id
        from item.person import get_sort_name
        import unicodedata
        sort_names = {}
        updates = {}
        for f in Find.query.filter(Find.key.in_(Item.filter_keys)):
            sort_type = get_by_id(settings.config['itemKeys'], f.key).get('sortType')
            if sort_type == 'person':
                if f.value in sort_names:
                    sortvalue = sort_names[f.value]
                else:
                    sortvalue = sort_names[f.value] = get_sort_name(f.value)
            else:
                sortvalue = f.value
            if sortvalue:
                sortvalue = ox.sort_string(unicodedata.normalize('NFKD', sortvalue)).lower()
                if not f.key in updates:
                    updates[f.key] = {}
                updates[f.key][f.value] = sortvalue
        for key in updates:
            for value in updates[key]:
                Find.query.filter_by(key=key, value=value).update({'sortvalue': updates[key][value]})
        session.commit()
    return 10

def migrate_11():
    with db.session() as session:
        from user.models import User, Metadata, List
        from changelog import Changelog
        import utils
        for u in User.query.filter_by(peered=True):
            peer = utils.get_peer(u.id)
            last = Changelog.query.filter_by(user_id=u.id).order_by(text('-revision')).first()
            if last:
                peer.info['revision'] = last.revision
            listorder = []
            for l in List.query.filter_by(user_id=u.id).order_by('index_'):
                if l.name:
                    peer.info['lists'][l.name] = [i.id for i in l.get_items()]
                    listorder.append(l.name)
            if 'listorder' not in peer.info:
                peer.info['listorder'] = listorder
            for m in Metadata.query.filter_by(user_id=u.id):
                peer.library[m.item_id] = {
                    'meta': dict(m.data),
                    'meta_hash': m.data_hash,
                    'modified': m.modified,
                }
            peer.library.commit()
            peer.sync_info()
            peer.sync_db()
            Changelog.query.filter_by(user_id=u.id).delete()
            Metadata.query.filter_by(user_id=u.id).delete()
        session.commit()
        if db.table_exists('transfer'):
            import state
            import downloads
            state.online = False
            state.downloads = downloads.Downloads()
            r = state.db.session.execute('SELECT item_id, added, progress FROM transfer')
            for t in r:
                item_id, added, progress = t
                if added:
                    state.downloads.transfers[item_id] = {
                        'added': added,
                        'progress': progress
                    }
            state.db.session.commit()
            state.downloads.transfers.commit()
            state.downloads = None
    return 11

def migrate_12():
    db.run_sql([
        'DROP TABLE IF EXISTS transfer'
    ])
    return 12

def migrate_13():
    import settings
    import changelog
    import os
    import json
    path = os.path.join(settings.data_path, 'peers', '%s.log' % settings.USER_ID)
    if not os.path.exists(path):
        with db.session() as session:
            revision = -1
            qs = changelog.Changelog.query.filter_by(user_id=settings.USER_ID)
            with open(path, 'w') as fd:
                for c in qs.order_by('timestamp'):
                    data = json.dumps([c.revision, c.timestamp, json.loads(c.data)], ensure_ascii=False)
                    fd.write(data + '\n')
                    revision = c.revision
            if revision > -1:
                settings.server['revision'] = revision
    return 13