import queue
import traceback
from queue import Queue
cimport constants
from threading import Thread

import yaml

from api_client cimport ApiClient
from annotation cimport Annotation
from inference cimport Inference
from remote_command cimport RemoteCommand, CommandType
from remote_command_handler cimport RemoteCommandHandler
from credentials cimport Credentials
from file_data cimport FileData

cdef class CommandProcessor:
    cdef ApiClient api_client
    cdef RemoteCommandHandler remote_handler
    cdef object inference_queue
    cdef bint running
    cdef Inference inference

    def __init__(self, int zmq_port, str api_url):
        self.api_client = ApiClient(api_url)
        self.remote_handler = RemoteCommandHandler(zmq_port, self.on_command)
        self.inference_queue = Queue(maxsize=constants.QUEUE_MAXSIZE)
        self.remote_handler.start()
        self.running = True
        self.inference = Inference(self.api_client, self.on_annotation)

    def start(self):
        while self.running:
            try:
                command = self.inference_queue.get(timeout=0.5)
                self.inference.run_inference(command)
                self.remote_handler.send(command.client_id, <bytes>'DONE'.encode('utf-8'))
            except queue.Empty:
                continue
            except Exception as e:
                traceback.print_exc()
        print('EXIT!')

    cdef on_command(self, RemoteCommand command):
        try:
            if command.command_type == CommandType.LOGIN:
                self.login(command)
            elif command.command_type == CommandType.LOAD:
                self.load_file(command)
            elif command.command_type == CommandType.INFERENCE:
                self.inference_queue.put(command)
            elif command.command_type == CommandType.STOP_INFERENCE:
                self.inference.stop()
            elif command.command_type == CommandType.EXIT:
                t = Thread(target=self.stop) # non-block worker:
                t.start()
            else:
                pass
        except Exception as e:
            print(f"Error handling client: {e}")

    cdef login(self, RemoteCommand command):
        self.api_client.set_credentials(Credentials.from_msgpack(command.data))
        Thread(target=self.inference.build_tensor_engine).start() # build AI engine in non-blocking thread

    cdef load_file(self, RemoteCommand command):
        cdef FileData file_data = FileData.from_msgpack(command.data)
        response = self.api_client.load_bytes(file_data.filename, file_data.folder)
        self.remote_handler.send(command.client_id, response)

    cdef on_annotation(self, RemoteCommand cmd, Annotation annotation):
        data = annotation.serialize()
        self.remote_handler.send(cmd.client_id, data)

    def stop(self):
        self.inference.stop()
        self.remote_handler.stop()
        self.running = False