# -*- 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

import settings

import directory
import utils
import state
import user

import json
from ed25519_utils import valid
import api
import cert

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

class NodeHandler(tornado.web.RequestHandler):

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


    def post(self):
        request = self.request
        if request.method == 'POST':
            '''
                API
                pullChanges     [userid] from [to]
                pushChanges     [index, change]
                requestPeering  username message
                acceptPeering   username message
                rejectPeering   message
                removePeering   message

                ping            responds public ip
            '''
            key = str(request.headers['X-Ed25519-Key'])
            sig = str(request.headers['X-Ed25519-Signature'])
            data = request.body
            content = {}
            if valid(key, data, sig):
                action, args = json.loads(data)
                logger.debug('%s action %s %s', key, action, args)
                if action == 'ping':
                    content = {
                        'ip': request.remote_addr
                    }
                else:
                    with self.app.app_context():
                        u = user.models.User.get(key)
                        if action in (
                            'requestPeering', 'acceptPeering', 'rejectPeering', 'removePeering'
                        ) or (u and u.peered):
                            content = getattr(api, 'api_' + action)(self.app, key, *args)
                        else:
                            logger.debug('PEER %s IS UNKNOWN SEND 403', key)
                            self.set_status(403)
                            content = {
                                'status': 'not peered'
                            }
            content = json.dumps(content)
            sig = settings.sk.sign(content, encoding='base64')
            self.set_header('X-Ed25519-Signature', sig)
            self.write(content)
            self.finish()

    def get(self):
        self.write('Open Media Library')
        self.finish()

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():
    host = utils.get_public_ipv6()
    state.online = directory.put(settings.sk, {
        'host': host,
        'port': settings.server['node_port'],
        'cert': settings.server['cert']
    })

def start(app):
    application = Application([
        (r"/get/(.*)", ShareHandler, dict(app=app)),
        (r".*", NodeHandler, dict(app=app)),
    ])
    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)
    return http_server