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

import os
import tornado
from tornado.web import Application
from tornado.httpserver import HTTPServer
from tornado.ioloop import PeriodicCallback

import settings

import directory
import state
import user

import json
from utils import valid, get_public_ipv6
import nodeapi
import cert
from websocket import trigger_event
from oxtornado import run_async

import logging
logger = logging.getLogger('oml.node.server')

class NodeHandler(tornado.web.RequestHandler):

    def initialize(self, app):
        self.app = app


    @tornado.web.asynchronous
    @tornado.gen.coroutine
    def post(self):
        '''
            API
            pullChanges     [userid] from [to]
            pushChanges     [index, change]
            requestPeering  username message
            acceptPeering   username message
            rejectPeering   message
            removePeering   message

            ping            responds public ip
        '''
        key = str(self.request.headers['X-Ed25519-Key'])
        sig = str(self.request.headers['X-Ed25519-Signature'])
        data = self.request.body
        content = {}

        self.set_header('X-Node-Protocol', settings.NODE_PROTOCOL)
        if self.request.headers.get('X-Node-Protocol', None) > settings.NODE_PROTOCOL:
            state.update_required = True
        if self.request.headers.get('X-Node-Protocol', None) != settings.NODE_PROTOCOL:
            content = settings.release
        else:
            if valid(key, data, sig):
                action, args = json.loads(data)
                logger.debug('NODE action %s %s (%s)', action, args, key)
                if action == 'ping':
                    content = {
                        'ip': self.request.remote_addr
                    }
                else:
                    content = yield tornado.gen.Task(api_call, self.app, action, key, args)
                    if content is None:
                        content = {'status': 'not peered'}
                        logger.debug('PEER %s IS UNKNOWN SEND 403', key)
                        self.set_status(403)
        content = json.dumps(content)
        sig = settings.sk.sign(content, encoding='base64')
        self.set_header('X-Ed25519-Signature', sig)
        self.set_header('X-Node-Protocol', settings.NODE_PROTOCOL)
        self.write(content)
        self.finish()

    def get(self):
        self.set_header('X-Node-Protocol', settings.NODE_PROTOCOL)
        if self.request.headers.get('X-Node-Protocol', None) > settings.NODE_PROTOCOL:
            state.update_required = True
        self.write('Open Media Library')
        self.finish()

@run_async
def api_call(app, action, key, args, callback):
    with app.app_context():
        u = user.models.User.get(key)
        if action in (
            'requestPeering', 'acceptPeering', 'rejectPeering', 'removePeering'
        ) or (u and u.peered):
            content = getattr(nodeapi, 'api_' + action)(app, key, *args)
        else:
            if u and u.pending:
                logger.debug('ignore request from pending peer[%s] %s (%s)', key, action, args)
                content = {}
            else:
                content = None
    callback(content)

class ShareHandler(tornado.web.RequestHandler):

    def initialize(self, app):
        self.app = app

    def get(self, id):
        with self.app.app_context():
            import item.models
            i = item.models.Item.get(id)
            if not i:
                self.set_status(404)
                self.finish()
            path = i.get_path()
            mimetype = {
                'epub': 'application/epub+zip',
                'pdf': 'application/pdf',
                'txt': 'text/plain',
            }.get(path.split('.')[-1], None)
            self.set_header('Content-Type', mimetype)
            logger.debug('GET file %s', id)
            with open(path, 'rb') as f:
                while 1:
                    data = f.read(16384)
                    if not data:
                        break
                    self.write(data)
            self.finish()


def publish_node(app):
    update_online()
    if state.online:
        with app.app_context():
            for u in user.models.User.query.filter_by(queued=True):
                logger.debug('adding queued node... %s', u.id)
                state.nodes.queue('add', u.id)
    state.check_nodes = PeriodicCallback(lambda: check_nodes(app), 120000)
    state.check_nodes.start()
    state._online = PeriodicCallback(update_online, 60000)
    state._online.start()

def update_online():
    host = get_public_ipv6()
    if not host:
        if state.online:
            state.online = False
            trigger_event('status', {
                'id': settings.USER_ID,
                'online': state.online
            })
    else:
        if host != state.host:
            state.host = host
            online = directory.put(settings.sk, {
                'host': host,
                'port': settings.server['node_port'],
                'cert': settings.server['cert']
            })
            if online != state.online:
                state.online = online
                trigger_event('status', {
                    'id': settings.USER_ID,
                    'online': state.online
                })

def check_nodes(app):
    if state.online:
        with app.app_context():
            for u in user.models.User.query.filter_by(queued=True):
                if not state.nodes.is_online(u.id):
                    logger.debug('queued peering message for %s trying to connect...', u.id)
                    state.nodes.queue('add', u.id)

def start(app):
    application = Application([
        (r"/get/(.*)", ShareHandler, dict(app=app)),
        (r".*", NodeHandler, dict(app=app)),
    ], gzip=True)
    if not os.path.exists(settings.ssl_cert_path):
        settings.server['cert'] = cert.generate_ssl()

    http_server = HTTPServer(application, ssl_options={
        "certfile": settings.ssl_cert_path,
        "keyfile": settings.ssl_key_path
    })
    http_server.listen(settings.server['node_port'], settings.server['node_address'])
    state.main.add_callback(publish_node, app)
    return http_server