1 files changed, 198 insertions, 0 deletions
diff --git a/src/frontend/app/contexts/SettingsContext.tsx b/src/frontend/app/contexts/SettingsContext.tsx
new file mode 100644
index 0000000..ed20fcb
--- /dev/null
+++ b/src/frontend/app/contexts/SettingsContext.tsx
@@ -0,0 +1,198 @@
+import {
+    createContext,
+    useContext,
+    useEffect,
+    useState,
+    type ReactNode,
+} from "react";
+import { APP_CONFIG } from "../config/AppConfig";
+import {
+    DEFAULT_REGION,
+    isValidRegion,
+    type RegionId
+} from "../config/RegionConfig";
+
+export type Theme = "light" | "dark" | "system";
+export type TableStyle = "regular" | "grouped" | "experimental_consolidated";
+export type MapPositionMode = "gps" | "last";
+
+interface SettingsContextProps {
+  theme: Theme;
+  setTheme: React.Dispatch<React.SetStateAction<Theme>>;
+  toggleTheme: () => void;
+
+  tableStyle: TableStyle;
+  setTableStyle: React.Dispatch<React.SetStateAction<TableStyle>>;
+  toggleTableStyle: () => void;
+
+  mapPositionMode: MapPositionMode;
+  setMapPositionMode: (mode: MapPositionMode) => void;
+
+  region: RegionId;
+  setRegion: (region: RegionId) => void;
+}
+
+const SettingsContext = createContext<SettingsContextProps | undefined>(
+  undefined
+);
+
+export const SettingsProvider = ({ children }: { children: ReactNode }) => {
+  //#region Theme
+  const getPreferredScheme = () => {
+    if (typeof window === "undefined" || !window.matchMedia) {
+      return "light" as const;
+    }
+    return window.matchMedia("(prefers-color-scheme: dark)").matches
+      ? "dark"
+      : "light";
+  };
+
+  const [systemTheme, setSystemTheme] = useState<"light" | "dark">(
+    getPreferredScheme
+  );
+
+  const [theme, setTheme] = useState<Theme>(() => {
+    const savedTheme = localStorage.getItem("theme");
+    if (
+      savedTheme === "light" ||
+      savedTheme === "dark" ||
+      savedTheme === "system"
+    ) {
+      return savedTheme;
+    }
+    return APP_CONFIG.defaultTheme;
+  });
+
+  useEffect(() => {
+    if (typeof window === "undefined" || !window.matchMedia) {
+      return;
+    }
+
+    const media = window.matchMedia("(prefers-color-scheme: dark)");
+    const handleChange = (event: MediaQueryListEvent) => {
+      setSystemTheme(event.matches ? "dark" : "light");
+    };
+
+    // Sync immediately in case theme changed before subscription
+    setSystemTheme(media.matches ? "dark" : "light");
+
+    if (media.addEventListener) {
+      media.addEventListener("change", handleChange);
+    } else {
+      media.addListener(handleChange);
+    }
+
+    return () => {
+      if (media.removeEventListener) {
+        media.removeEventListener("change", handleChange);
+      } else {
+        media.removeListener(handleChange);
+      }
+    };
+  }, []);
+
+  const resolvedTheme = theme === "system" ? systemTheme : theme;
+
+  const toggleTheme = () => {
+    setTheme((prevTheme) => {
+      if (prevTheme === "light") {
+        return "dark";
+      }
+      if (prevTheme === "dark") {
+        return "system";
+      }
+      return "light";
+    });
+  };
+
+  useEffect(() => {
+    document.documentElement.setAttribute("data-theme", resolvedTheme);
+    document.documentElement.style.colorScheme = resolvedTheme;
+  }, [resolvedTheme]);
+
+  useEffect(() => {
+    localStorage.setItem("theme", theme);
+  }, [theme]);
+  //#endregion
+
+  //#region Table Style
+  const [tableStyle, setTableStyle] = useState<TableStyle>(() => {
+    const savedTableStyle = localStorage.getItem("tableStyle");
+    if (savedTableStyle) {
+      return savedTableStyle as TableStyle;
+    }
+    return APP_CONFIG.defaultTableStyle;
+  });
+
+  const toggleTableStyle = () => {
+    setTableStyle((prevTableStyle) =>
+      prevTableStyle === "regular" ? "grouped" : "regular"
+    );
+  };
+
+  useEffect(() => {
+    localStorage.setItem("tableStyle", tableStyle);
+  }, [tableStyle]);
+  //#endregion
+
+  //#region Map Position Mode
+  const [mapPositionMode, setMapPositionMode] = useState<MapPositionMode>(
+    () => {
+      const saved = localStorage.getItem("mapPositionMode");
+      return saved === "last" || saved === "gps"
+        ? (saved as MapPositionMode)
+        : APP_CONFIG.defaultMapPositionMode;
+    }
+  );
+
+  useEffect(() => {
+    localStorage.setItem("mapPositionMode", mapPositionMode);
+  }, [mapPositionMode]);
+  //#endregion
+
+  //#region Region
+  const [region, setRegionState] = useState<RegionId>(() => {
+    const savedRegion = localStorage.getItem("region");
+    if (savedRegion && isValidRegion(savedRegion)) {
+      return savedRegion;
+    }
+    return DEFAULT_REGION;
+  });
+
+  const setRegion = (newRegion: RegionId) => {
+    setRegionState(newRegion);
+    localStorage.setItem("region", newRegion);
+  };
+
+  useEffect(() => {
+    localStorage.setItem("region", region);
+  }, [region]);
+  //#endregion
+
+  return (
+    <SettingsContext.Provider
+      value={{
+        theme,
+        setTheme,
+        toggleTheme,
+        tableStyle,
+        setTableStyle,
+        toggleTableStyle,
+        mapPositionMode,
+        setMapPositionMode,
+        region,
+        setRegion,
+      }}
+    >
+      {children}
+    </SettingsContext.Provider>
+  );
+};
+
+export const useSettings = () => {
+  const context = useContext(SettingsContext);
+  if (!context) {
+    throw new Error("useSettings must be used within a SettingsProvider");
+  }
+  return context;
+};