import os
import sys
import time

import syncthing_monitor.config_xml as xml
from .etcd_client import EtcdClient
from .syncthing_client import SyncthingClient

SHARED_FOLDER_ID = "data"
SHARED_FOLDER_LABEL = "syncthing_monitor_data"
SYNCTHING_CONFIG_XML_PATH = '/config/config.xml'
SYNCTHING_GUI_PORT = 8384
ETCD_PORT = 2379
ETCD_KEY = '/syncthing_monitor/cluster_info'


def main():
    syncthing_mon = SyncthingMonitor(os.getenv('SYNCTHING_NODE_NAME', 'sync'),
                                     os.getenv('SYNCTHING_PUBLISH_ADDRESS', 'tcp4://sync'),
                                     os.getenv('SYNCTHING_DATA_PATH', '/data'),
                                     os.getenv('SYNCTHING_CONFIG_XML_PATH', SYNCTHING_CONFIG_XML_PATH),
                                     os.getenv('SYNCTHING_LOCAL_HOSTNAME', 'sync'),
                                     os.getenv('SYNCTHING_GUI_PORT', SYNCTHING_GUI_PORT),
                                     os.getenv('ETCD_HOSTNAME', 'etcd'),
                                     os.getenv('ETCD_PORT', ETCD_PORT),
                                     os.getenv('ETCD_KEY', ETCD_KEY))
    syncthing_mon.start()


class SyncthingMonitor:
    def __init__(self, syncthing_node_name, syncthing_publish_address, syncthing_data_path,
                 syncthing_config_xml_path, syncthing_local_hostname, syncthing_gui_port,
                 etcd_hostname, etcd_port, etcd_key):
        self.syncthing_node_name = syncthing_node_name
        self.syncthing_publish_address = syncthing_publish_address
        self.syncthing_data_path = syncthing_data_path
        self.my_device_id = None
        self.syncthing = None
        self.etcd = EtcdClient(etcd_hostname, etcd_port, etcd_key)
        self.syncthing_gui_port = syncthing_gui_port
        self.syncthing_local_hostname = syncthing_local_hostname
        self.syncthing_config_xml_path = syncthing_config_xml_path

    def initialize_syncthing(self):
        api_key = xml.parse_api_key(self.syncthing_config_xml_path)
        print("Found API Key: {0}".format(api_key))

        print("Configuring Syncthing to listen on 0.0.0.0...", flush=True)
        xml.set_listen_ip_to_any(self.syncthing_config_xml_path,
                                 self.syncthing_config_xml_path,
                                 self.syncthing_gui_port)

        self.syncthing = SyncthingClient(api_key, self.syncthing_local_hostname, self.syncthing_gui_port)

    def start(self):
        self.initialize_syncthing()

        self.my_device_id = self.syncthing.get_my_device_id()
        print("Found My Device ID: {0}".format(self.my_device_id), flush=True)

        print("Disabling global/local discovery/relay...", flush=True)
        self.syncthing.disable_announce_discovery_and_relay()
        self.syncthing.sync_config()

        print("Registering etcd update callback...", flush=True)
        self.etcd.register_device_update_handler(self.update_devices)

        print("Attempting to add this device to etcd...", flush=True)
        self.etcd.add_device_to_cluster(self.my_device_id, self.syncthing_node_name, self.syncthing_publish_address)
        print("Added this device to cluster with publish address: {0}".format(self.syncthing_publish_address),
              flush=True)

        self.update_devices(None)

        print("Entering loop...", flush=True)
        self.loop()

    @staticmethod
    def loop():
        while True:
            sys.stdout.flush()
            time.sleep(1)

    # noinspection PyUnusedLocal
    def update_devices(self, event):
        print("Updating syncthing based on change to cluster info...", flush=True)
        print("--> Obtaining updated device list...", flush=True)
        device_list = self.etcd.get_device_list()
        print("--> Adding new devices to syncthing...", flush=True)
        self.syncthing.add_devices(device_list)
        print("--> Updating shared folder with new devices...", flush=True)
        self.syncthing.create_shared_folder(SHARED_FOLDER_ID, SHARED_FOLDER_LABEL, self.syncthing_data_path,
                                            device_list)
        self.syncthing.sync_config()
        self.syncthing.print_config()
        print("--> Update completed successfully!", flush=True)


if __name__ == "__main__":
    main()