# Copyright (C) 2024 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

import asyncio
import os

from comps import Gateway, MegaServiceEndpoint, MicroService, ServiceOrchestrator, ServiceType
from comps.cores.proto.api_protocol import (
    ChatCompletionRequest,
    ChatCompletionResponse,
    ChatCompletionResponseChoice,
    ChatMessage,
    UsageInfo,
)
from comps.cores.proto.docarray import LLMParams
from fastapi import Request
from fastapi.responses import StreamingResponse

MEGA_SERVICE_PORT = int(os.getenv("MEGA_SERVICE_PORT", 7778))
LLM_SERVICE_HOST_IP = os.getenv("LLM_SERVICE_HOST_IP", "0.0.0.0")
LLM_SERVICE_PORT = int(os.getenv("LLM_SERVICE_PORT", 9000))


class CodeGenService(Gateway):
    def __init__(self, host="0.0.0.0", port=8000):
        self.host = host
        self.port = port
        self.megaservice = ServiceOrchestrator()

    def add_remote_service(self):
        llm = MicroService(
            name="llm",
            host=LLM_SERVICE_HOST_IP,
            port=LLM_SERVICE_PORT,
            endpoint="/v1/chat/completions",
            use_remote_service=True,
            service_type=ServiceType.LLM,
        )
        self.megaservice.add(llm)

    async def handle_request(self, request: Request):
        data = await request.json()
        stream_opt = data.get("stream", True)
        chat_request = ChatCompletionRequest.parse_obj(data)
        prompt = self._handle_message(chat_request.messages)
        parameters = LLMParams(
            max_tokens=chat_request.max_tokens if chat_request.max_tokens else 1024,
            top_k=chat_request.top_k if chat_request.top_k else 10,
            top_p=chat_request.top_p if chat_request.top_p else 0.95,
            temperature=chat_request.temperature if chat_request.temperature else 0.01,
            frequency_penalty=chat_request.frequency_penalty if chat_request.frequency_penalty else 0.0,
            presence_penalty=chat_request.presence_penalty if chat_request.presence_penalty else 0.0,
            repetition_penalty=chat_request.repetition_penalty if chat_request.repetition_penalty else 1.03,
            streaming=stream_opt,
        )
        result_dict, runtime_graph = await self.megaservice.schedule(
            initial_inputs={"query": prompt}, llm_parameters=parameters
        )
        for node, response in result_dict.items():
            # Here it suppose the last microservice in the megaservice is LLM.
            if (
                isinstance(response, StreamingResponse)
                and node == list(self.megaservice.services.keys())[-1]
                and self.megaservice.services[node].service_type == ServiceType.LLM
            ):
                return response
        last_node = runtime_graph.all_leaves()[-1]
        response = result_dict[last_node]["text"]
        choices = []
        usage = UsageInfo()
        choices.append(
            ChatCompletionResponseChoice(
                index=0,
                message=ChatMessage(role="assistant", content=response),
                finish_reason="stop",
            )
        )
        return ChatCompletionResponse(model="codegen", choices=choices, usage=usage)

    def start(self):
        super().__init__(
            megaservice=self.megaservice,
            host=self.host,
            port=self.port,
            endpoint=str(MegaServiceEndpoint.CODE_GEN),
            input_datatype=ChatCompletionRequest,
            output_datatype=ChatCompletionResponse,
        )


if __name__ == "__main__":
    chatqna = CodeGenService(port=MEGA_SERVICE_PORT)
    chatqna.add_remote_service()
    chatqna.start()