import logging
import time

from typing import Callable, Dict
from concurrent.futures import Future
from opentelemetry import trace
from opentelemetry.propagate import get_global_textmap, set_global_textmap
from opentelemetry.propagators.tracecontext import TraceContextTextMapPropagator
from opentelemetry.trace import Span, Tracer, TraceState

from amqp.adapter.amq_message_factory import AMQMessageFactory
from amqp.model.model import AMQResponse
from amqp.router.serializer import map_as_string


class AMQServiceMessageHandler:
    def __init__(self, http_adapter, tracer):
        self.http_adapter = http_adapter
        self.tracer = tracer
        self.outstanding = {}

    def on_delivery_callback_http(self, channel, consumerTag, delivery):
        start = time.time()
        deliveryTag = delivery.envelope.delivery_tag
        debug = f" [DBG] ######[{deliveryTag}] (AMQ MESSAGE), env: {delivery.envelope}, props: {delivery.properties}"
        logging.info(debug)

        amq_message = AMQMessageFactory.from_bytes(delivery.body)
        logging.info(" [*] ######[%s] AMQ Message received, ctag=%s, msgId=%s, traceInfo=%s",
                    deliveryTag, consumerTag, amq_message.id, map_as_string(amq_message.trace_info))

        propagator = TraceContextTextMapPropagator.get_instance()
        context = propagator.extract(trace.get_current_context(), amq_message.trace_info    , self.get_text_getter())
        parent_span = Span.from_context(context)
        context = context.with_span(parent_span)

        with context.activate():
            logging.info(" [*] CTX=%s", context)
            current_span = self.tracer.start_span("AMQ-Adapter.Processing.Request", parent=parent_span)
            context_with_span = trace.set_span_in_context(current_span, context)
            logging.info(" [*] CTX2=%s", context_with_span)
            propagator.inject(context_with_span, amq_message.trace_info, self.set_text)
            logging.info(" [***] NEW TI=%s CTX=%s SCOPE=%s",
                        map_as_string(amq_message.trace_info), context_with_span, context)

            if amq_message.magic == AMQMessageFactory.MAGIC_BYTE_HTTP_REQUEST:
                future = self.http_adapter.handle(amq_message)
                future.add_done_callback(
                    lambda f: self.on_http_response(delivery, deliveryTag, channel, f.result())
                )
            else:
                logging.error(" [E] Unknown MAGIC value: [%s], don't know how to interpret the message",
                              amq_message.magic())

            duration = time.time() - start
            if "___NACK___" in str(amq_message.body()):
                logging.info(" [x] ######[%s] Done, single NACK: %sms.", deliveryTag, duration)
                channel.basic_nack(deliveryTag, False, False)
            else:
                logging.info(" [x] ######[%s] Done, single ACK: %sms.", deliveryTag, duration)
                channel.basic_ack(deliveryTag, False)

    def on_http_response(self, delivery, deliveryTag, channel, http_response):
        response = AMQResponse(
            delivery.properties.correlation_id,
            http_response.status_code,
            http_response.headers.get("Content-Type"),
            http_response.body,
            http_response.status_message,
            "",
            self.collect_trace_info(trace.get_current_context())
        )
        try:
            self.send_reply(delivery.properties.reply_to, deliveryTag, channel, response)
        except Exception as e:
            raise RuntimeError(e)


    class AMQServiceMessageHandler:
        def __init__(self, http_adapter, tracer):
            self.http_adapter = http_adapter
            self.tracer = tracer
            self.outstanding: Dict[str, 'ResponseHolder'] = {}

        def collect_trace_info(self, context):
            map = {}
            TraceContextTextMapPropagator.get_instance().inject(
                context if context else trace.get_current_context(),
                map, self.set_text
            )
            return map

        def send_reply(self, reply_to, delivery_tag, channel, response):
            if reply_to:
                logging.info(" [*] ######[%s] AMQ Message Reply, To=%s, msgId=%s",
                             delivery_tag, reply_to, response.id())
                reply_props = pika.BasicProperties(
                    correlation_id=response.id(),
                    content_type=response.content_type()
                )
                channel.basic_publish(
                    RouterBase.AMQ_REPLY_TO_EXCHANGE,
                    reply_to,
                    reply_props,
                    AMQResponseFactory.serialize(response)
                )

        def on_reply_consumer(self, channel):
            def handle_delivery(consumerTag, envelope, properties, body):
                reply_id = properties.correlation_id
                content_type = properties.content_type
                delivery_tag = envelope.delivery_tag
                debug = f" [DBG] ######[{delivery_tag}]     (RPC REPLY) env: {envelope}, props: {properties}, BODY: {body.decode()}"
                logging.info(debug)
                print(f"OUTSTANDING RECV: {self.outstanding}, size={len(self.outstanding)}")

                with self.outstanding.lock:
                    reply = self.outstanding.pop(reply_id, None)
                    if reply is None:
                        logging.warn(" [W] ######[%s] IGNORING REPLY. No outstanding request for ID %s",
                                     delivery_tag, reply_id)
                    else:
                        result = AMQResponseFactory.from_bytes(body)
                        reply.tracing_span().end()
                        reply.response().set_result(Response.ok(result.body(), content_type).build())

                channel.basic_ack(delivery_tag, False)

            return handle_delivery

        def register_response_holder(self, id, response_holder):
            self.outstanding[id] = response_holder
            logging.info(" [*] AMQMessage Sent, OUTSTANDING response holder registered: %s, size=%s",
                         self.outstanding, len(self.outstanding))

        def get_default_trace_state(self):
            return TraceState(entries={})

        def get_text_getter(self):
            return lambda map, key: map.get(key)

        def set_text(self, carrier, key, value):
            carrier[key] = value