"""Thread-safe shared state for UI and trading loop."""
import threading
from dataclasses import dataclass, field
from typing import Optional
from datetime import datetime, timezone


@dataclass
class PositionState:
    """Current position information."""

    trade_id: str = ""
    symbol: str = ""
    side: str = ""
    entry_price: float = 0.0
    current_price: float = 0.0
    size: float = 0.0
    size_usdt: float = 0.0
    unrealized_pnl: float = 0.0
    unrealized_pnl_pct: float = 0.0
    stop_loss_price: float = 0.0
    take_profit_price: float = 0.0


@dataclass
class StrategyState:
    """Current strategy signal state."""

    z_score: float = 0.0
    probability: float = 0.0
    funding_rate: float = 0.0
    last_action: str = "hold"
    last_reason: str = ""
    last_signal_time: str = ""


@dataclass
class AccountState:
    """Account balance information."""

    balance: float = 0.0
    available: float = 0.0
    leverage: int = 1


class SharedState:
    """
    Thread-safe shared state between trading loop and UI.

    All access to state fields should go through the getter/setter methods
    which use a lock for thread safety.
    """

    def __init__(self):
        self._lock = threading.Lock()
        self._position: Optional[PositionState] = None
        self._strategy = StrategyState()
        self._account = AccountState()
        self._is_running = True
        self._last_cycle_time: Optional[str] = None
        self._mode = "DEMO"
        self._eth_symbol = "ETH/USDT:USDT"
        self._btc_symbol = "BTC/USDT:USDT"

    # Position methods
    def get_position(self) -> Optional[PositionState]:
        """Get current position state."""
        with self._lock:
            return self._position

    def set_position(self, position: Optional[PositionState]) -> None:
        """Set current position state."""
        with self._lock:
            self._position = position

    def update_position_price(self, current_price: float) -> None:
        """Update current price and recalculate PnL."""
        with self._lock:
            if self._position is None:
                return

            self._position.current_price = current_price

            if self._position.side == "long":
                pnl = (current_price - self._position.entry_price)
                self._position.unrealized_pnl = pnl * self._position.size
                pnl_pct = (current_price / self._position.entry_price - 1) * 100
            else:
                pnl = (self._position.entry_price - current_price)
                self._position.unrealized_pnl = pnl * self._position.size
                pnl_pct = (1 - current_price / self._position.entry_price) * 100

            self._position.unrealized_pnl_pct = pnl_pct

    def clear_position(self) -> None:
        """Clear current position."""
        with self._lock:
            self._position = None

    # Strategy methods
    def get_strategy(self) -> StrategyState:
        """Get current strategy state."""
        with self._lock:
            return StrategyState(
                z_score=self._strategy.z_score,
                probability=self._strategy.probability,
                funding_rate=self._strategy.funding_rate,
                last_action=self._strategy.last_action,
                last_reason=self._strategy.last_reason,
                last_signal_time=self._strategy.last_signal_time,
            )

    def update_strategy(
        self,
        z_score: float,
        probability: float,
        funding_rate: float,
        action: str,
        reason: str,
    ) -> None:
        """Update strategy state."""
        with self._lock:
            self._strategy.z_score = z_score
            self._strategy.probability = probability
            self._strategy.funding_rate = funding_rate
            self._strategy.last_action = action
            self._strategy.last_reason = reason
            self._strategy.last_signal_time = datetime.now(
                timezone.utc
            ).isoformat()

    # Account methods
    def get_account(self) -> AccountState:
        """Get current account state."""
        with self._lock:
            return AccountState(
                balance=self._account.balance,
                available=self._account.available,
                leverage=self._account.leverage,
            )

    def update_account(
        self,
        balance: float,
        available: float,
        leverage: int,
    ) -> None:
        """Update account state."""
        with self._lock:
            self._account.balance = balance
            self._account.available = available
            self._account.leverage = leverage

    # Control methods
    def is_running(self) -> bool:
        """Check if trading loop is running."""
        with self._lock:
            return self._is_running

    def stop(self) -> None:
        """Signal to stop trading loop."""
        with self._lock:
            self._is_running = False

    def get_last_cycle_time(self) -> Optional[str]:
        """Get last trading cycle time."""
        with self._lock:
            return self._last_cycle_time

    def set_last_cycle_time(self, time_str: str) -> None:
        """Set last trading cycle time."""
        with self._lock:
            self._last_cycle_time = time_str

    # Config methods
    def get_mode(self) -> str:
        """Get trading mode (DEMO/LIVE)."""
        with self._lock:
            return self._mode

    def set_mode(self, mode: str) -> None:
        """Set trading mode."""
        with self._lock:
            self._mode = mode

    def get_symbols(self) -> tuple[str, str]:
        """Get trading symbols (eth, btc)."""
        with self._lock:
            return self._eth_symbol, self._btc_symbol

    def set_symbols(self, eth_symbol: str, btc_symbol: str) -> None:
        """Set trading symbols."""
        with self._lock:
            self._eth_symbol = eth_symbol
            self._btc_symbol = btc_symbol