# app/src/trading/auto/service.py

from __future__ import annotations

from src.core.config import load_settings
from src.trading.auto.state import AutoTradeState


class AutoTradeService:
    _state = AutoTradeState()

    def get_state(self) -> AutoTradeState:
        if not self._state.symbol:
            self._state.symbol = load_settings().default_symbol

        return self._state

    def start(self) -> tuple[AutoTradeState, str]:
        state = self.get_state()

        if state.status == "RUNNING":
            return state, "Автоторговля уже активна."

        if state.status == "OBSERVING":
            state.status = "RUNNING"
            return state, "Автоторговля активирована."

        state.status = "RUNNING"
        return state, "Автоторговля запущена."

    def observe(self) -> tuple[AutoTradeState, str]:
        state = self.get_state()
        previous_status = state.status

        if previous_status == "OBSERVING":
            return state, "Режим наблюдения уже включён."

        state.status = "OBSERVING"

        if previous_status == "OFF":
            return state, "Включён режим наблюдения."

        return state, "Автоторговля переведена в режим наблюдения."

    def stop(self) -> tuple[AutoTradeState, str]:
        state = self.get_state()

        if state.status == "OFF":
            return state, "Автоторговля уже выключена."

        state.status = "OFF"
        return state, "Автоторговля выключена."