Stage 03.1 - mock exchange integration

app/src/integrations/exchange/service.py

@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+from src.core.config import load_settings
+from src.integrations.exchange.mock_data import (
+    mock_balance_summary,
+    mock_exchange_health,
+    mock_ticker_price,
+)
+from src.integrations.exchange.models import BalanceSummary, ExchangeHealth, TickerPrice
+
+
+class ExchangeService:
+    def __init__(self) -> None:
+        self.settings = load_settings()
+
+    def get_health(self) -> ExchangeHealth:
+        if not self.settings.exchange_enabled:
+            return mock_exchange_health()
+
+        if not self.settings.exchange_api_key or not self.settings.exchange_api_secret:
+            return ExchangeHealth(
+                ok=False,
+                mode="configured_without_keys",
+                message="Интеграция включена, но API key / secret не заданы.",
+            )
+
+        return ExchangeHealth(
+            ok=False,
+            mode="real_pending",
+            message="Реальный REST client еще не подключен. Пока доступен только mock mode.",
+        )
+
+    def get_price(self, symbol: str | None = None) -> TickerPrice:
+        symbol_to_use = symbol or self.settings.default_symbol
+        return mock_ticker_price(symbol_to_use)
+
+    def get_balance_summary(self) -> list[BalanceSummary]:
+        return mock_balance_summary()