import { useEffect } from "preact/hooks";

// Simple safe storage functions to avoid errorHandling.ts dependency
function safeLocalStorage() {
  try {
    if (typeof localStorage === "undefined") {
      return null;
    }
    // Test if localStorage is accessible
    const testKey = "__test__";
    localStorage.setItem(testKey, "test");
    localStorage.removeItem(testKey);
    return localStorage;
  } catch {
    return null;
  }
}

function safeSessionStorage() {
  try {
    if (typeof sessionStorage === "undefined") {
      return null;
    }
    // Test if sessionStorage is accessible
    const testKey = "__test__";
    sessionStorage.setItem(testKey, "test");
    sessionStorage.removeItem(testKey);
    return sessionStorage;
  } catch {
    return null;
  }
}

/**
 * Custom hook to manage Service Worker registration
 * Handles registration, unregistration, and session-based updates
 * Includes robust error handling for network issues and broken pipes
 *
 * @example
 * ```tsx
 * function MyComponent() {
 *   useServiceWorker();
 *   return <div>Component content</div>;
 * }
 * ```
 */
export function useServiceWorker() {
  useEffect(() => {
    if ("serviceWorker" in navigator) {
      // Check if this is a new user experience (session start)
      const storage = safeSessionStorage();
      const isNewSession = !storage?.getItem("sw_registered");

      // Add timeout for service worker operations
      // const registrationTimeout = setTimeout(() => {
      //   console.warn("Service Worker registration taking longer than expected");
      // }, 10000);

      navigator.serviceWorker.getRegistrations().then((registrations) => {
        const activeSW = registrations.find((reg) =>
          reg.active?.scriptURL.includes("fetch_sw.js")
        );

        if (activeSW && !isNewSession) {
          // Service worker already active and not a new session - skip registration
          // console.log("Service Worker already active.");
          // clearTimeout(registrationTimeout);
          return;
        }

        // New session or no active SW - unregister old versions and register new
        const unregisterPromises = registrations.map((registration) =>
          registration.unregister().catch((_err) => {
            // Log but don't fail if unregistration fails
            // console.warn("Failed to unregister old service worker:", err);
            return Promise.resolve();
          })
        );

        return Promise.all(unregisterPromises).then(() => {
          // Register the new service worker after unregistering old ones
          return navigator.serviceWorker.register("/fetch_sw.js");
        }).then(() => {
          // console.log("Service Worker registered.");
          const swStorage = safeSessionStorage();
          swStorage?.setItem("sw_registered", "true");
          // clearTimeout(registrationTimeout);
        }).catch((_regError) => {
          // Handle registration errors gracefully
          // console.error("Service Worker registration failed:", regError);
          // clearTimeout(registrationTimeout);
          // Don't throw - allow app to continue without service worker
        });
      }).catch((_error) => {
        //clearTimeout(registrationTimeout);

        // Handle different error types
        // const errorMessage = error instanceof Error ? error.message : String(error);
        // if (error instanceof TypeError || errorMessage.includes("network")) {
        //   console.error("Network error during service worker setup:", error);
        // } else if (errorMessage.includes("broken pipe")) {
        //   console.error("Connection broken during service worker setup:", error);
        // } else {
        //   console.error("Service Worker registration failed:", error);
        // }
        // App should continue functioning without service worker
      });
    }
    // else {
    //   console.log("Service Worker not supported in this browser.");
    // }

    // Cleanup function
    return () => {
      // No cleanup needed for service worker registration
    };
  }, []);
}

/**
 * Custom hook to manage logout button state
 * Handles post-logout redirect cleanup
 * Includes error handling for localStorage access issues
 */
export function useLogoutCleanup() {
  useEffect(() => {
    try {
      // Use safe localStorage access
      const storage = safeLocalStorage();
      if (!storage) {
        console.warn("localStorage not available");
        return;
      }

      const lastClickedButton = storage.getItem("lastClickedButton");
      if (lastClickedButton === "logout") {
        storage.removeItem("lastClickedButton");

        // Add try-catch for URL manipulation and redirect
        try {
          const url = new URL(globalThis.location.href);
          globalThis.location.href = url.origin + "?popstate=true";
        } catch (urlError) {
          console.error("Error during logout redirect:", urlError);
          // Fallback to simple redirect
          globalThis.location.href = "/";
        }
      }
    } catch (error) {
      // Handle localStorage access errors (quota exceeded, privacy mode, etc.)
      console.error("Error during logout cleanup:", error);
    }
  }, []);
}