"""
This module contains class to manage RPC communications (Telegram, API, ...)
"""
import logging
from collections import deque
from typing import Any, Dict, List

from freqtrade.constants import Config
from freqtrade.enums import RPCMessageType
from freqtrade.rpc import RPC, RPCHandler


logger = logging.getLogger(__name__)


class RPCManager:
    """
    Class to manage RPC objects (Telegram, API, ...)
    """

    def __init__(self, freqtrade) -> None:
        """ Initializes all enabled rpc modules """
        self.registered_modules: List[RPCHandler] = []
        self._rpc = RPC(freqtrade)
        config = freqtrade.config
        # Enable telegram
        if config.get('telegram', {}).get('enabled', False):
            logger.info('Enabling rpc.telegram ...')
            from freqtrade.rpc.telegram import Telegram
            self.registered_modules.append(Telegram(self._rpc, config))

        # Enable discord
        if config.get('discord', {}).get('enabled', False):
            logger.info('Enabling rpc.discord ...')
            from freqtrade.rpc.discord import Discord
            self.registered_modules.append(Discord(self._rpc, config))

        # Enable Webhook
        if config.get('webhook', {}).get('enabled', False):
            logger.info('Enabling rpc.webhook ...')
            from freqtrade.rpc.webhook import Webhook
            self.registered_modules.append(Webhook(self._rpc, config))

        # Enable local rest api server for cmd line control
        if config.get('api_server', {}).get('enabled', False):
            logger.info('Enabling rpc.api_server')
            from freqtrade.rpc.api_server import ApiServer
            apiserver = ApiServer(config)
            apiserver.add_rpc_handler(self._rpc)
            self.registered_modules.append(apiserver)

    def cleanup(self) -> None:
        """ Stops all enabled rpc modules """
        logger.info('Cleaning up rpc modules ...')
        while self.registered_modules:
            mod = self.registered_modules.pop()
            logger.info('Cleaning up rpc.%s ...', mod.name)
            mod.cleanup()
            del mod

    def send_msg(self, msg: Dict[str, Any]) -> None:
        """
        Send given message to all registered rpc modules.
        A message consists of one or more key value pairs of strings.
        e.g.:
        {
            'status': 'stopping bot'
        }
        """
        if msg.get('type') not in (RPCMessageType.ANALYZED_DF, RPCMessageType.WHITELIST):
            logger.info('Sending rpc message: %s', msg)
        if 'pair' in msg:
            msg.update({
                'base_currency': self._rpc._freqtrade.exchange.get_pair_base_currency(msg['pair'])
                })
        for mod in self.registered_modules:
            logger.debug('Forwarding message to rpc.%s', mod.name)
            try:
                mod.send_msg(msg)
            except NotImplementedError:
                logger.error(f"Message type '{msg['type']}' not implemented by handler {mod.name}.")
            except Exception:
                logger.exception('Exception occurred within RPC module %s', mod.name)

    def process_msg_queue(self, queue: deque) -> None:
        """
        Process all messages in the queue.
        """
        while queue:
            msg = queue.popleft()

            for mod in self.registered_modules:
                if mod._config.get(mod.name, {}).get('allow_custom_messages', False):
                    mod.send_msg({
                        'type': RPCMessageType.STRATEGY_MSG,
                        'msg': msg,
                    })

    def startup_messages(self, config: Config, pairlist, protections) -> None:
        if config['dry_run']:
            self.send_msg({
                'type': RPCMessageType.WARNING,
                'status': 'Dry run is enabled. All trades are simulated.'
            })
        stake_currency = config['stake_currency']
        stake_amount = config['stake_amount']
        minimal_roi = config['minimal_roi']
        stoploss = config['stoploss']
        trailing_stop = config['trailing_stop']
        timeframe = config['timeframe']
        exchange_name = config['exchange']['name']
        strategy_name = config.get('strategy', '')
        pos_adjust_enabled = 'On' if config['position_adjustment_enable'] else 'Off'
        self.send_msg({
            'type': RPCMessageType.STARTUP,
            'status': f'*Exchange:* `{exchange_name}`\n'
                      f'*Stake per trade:* `{stake_amount} {stake_currency}`\n'
                      f'*Minimum ROI:* `{minimal_roi}`\n'
                      f'*{"Trailing " if trailing_stop else ""}Stoploss:* `{stoploss}`\n'
                      f'*Position adjustment:* `{pos_adjust_enabled}`\n'
                      f'*Timeframe:* `{timeframe}`\n'
                      f'*Strategy:* `{strategy_name}`'
        })
        self.send_msg({
            'type': RPCMessageType.STARTUP,
            'status': f'Searching for {stake_currency} pairs to buy and sell '
                      f'based on {pairlist.short_desc()}'
        })
        if len(protections.name_list) > 0:
            prots = '\n'.join([p for prot in protections.short_desc() for k, p in prot.items()])
            self.send_msg({
                'type': RPCMessageType.STARTUP,
                'status': f'Using Protections: \n{prots}'
            })