import os
from uuid import UUID

import requests
from pydantic import BaseModel


class GetAvailableInterviewsRequest(BaseModel):
    user_hf_id: str


class InterviewMeta(BaseModel):
    title: str
    creator_name: str
    id: str


class GetAvailableInterviewsResponse(BaseModel):
    interviews: list[InterviewMeta]


class StartChatRequest(BaseModel):
    user_hf_id: str
    interview_id: str


class StartChatResponse(BaseModel):
    chat_id: UUID
    first_message: str


class GetChatRequest(BaseModel):
    chat_id: UUID
    user_message: str


class GetChatResponse(BaseModel):
    chat_id: UUID
    agent_message: str | None
    error_message: str | None
    end_interview: bool


class AppClient:

    url_available_interviews = os.environ["ENDPOINT_AVAILABLE_CHAT"]
    url_init_chat = os.environ["ENDPOINT_CHAT_INIT"]
    url_chat_response = os.environ["ENDPOINT_CHAT_RESPONSE"]

    @classmethod
    def _call_endpoint(cls, endpoint, data):
        headers = {
            "Content-Type": "application/json",
        }
        response = requests.post(url=endpoint, json=data.model_dump(mode="json"), headers=headers)
        if response.status_code == 200:
            return response.json()
        return None

    @classmethod
    def get_chats(cls, user_hf_id) -> list[InterviewMeta] | None:
        request = GetAvailableInterviewsRequest(user_hf_id=user_hf_id)
        response_json = cls._call_endpoint(cls.url_available_interviews, request)
        if response_json is None:
            return None
        return GetAvailableInterviewsResponse.model_validate(response_json).interviews

    @classmethod
    def start_chat(cls, user_hf_id: str, interview_id: str) -> StartChatResponse | None:
        request = StartChatRequest(user_hf_id=user_hf_id, interview_id=interview_id)
        response_json = cls._call_endpoint(cls.url_init_chat, request)
        if response_json is None:
            return None
        return StartChatResponse.model_validate(response_json)

    @classmethod
    def get_agent_response(cls, chat_id: UUID, user_message: str) -> GetChatResponse | None:
        request = GetChatRequest(chat_id=chat_id, user_message=user_message)
        response_json = cls._call_endpoint(cls.url_chat_response, request)
        if response_json is None:
            return None
        return GetChatResponse.model_validate(response_json)