import { useCallback, useRef } from "react";
import { useShallow } from "zustand/react/shallow";
import { useAppState } from "../store/appState";
import * as commands from "../lib/tauri-commands";

const CHECK_INTERVAL_MS = 24 * 60 * 60 * 1000; // 24 hours

export function useUpdates() {
  const { updateInfo, setUpdateInfo, appVersion, setAppVersion, appSettings } =
    useAppState(
      useShallow((s) => ({
        updateInfo: s.updateInfo,
        setUpdateInfo: s.setUpdateInfo,
        appVersion: s.appVersion,
        setAppVersion: s.setAppVersion,
        appSettings: s.appSettings,
      })),
    );

  const intervalRef = useRef<ReturnType<typeof setInterval> | null>(null);

  const loadVersion = useCallback(async () => {
    try {
      const version = await commands.getAppVersion();
      setAppVersion(version);
    } catch (e) {
      console.error("Failed to load app version:", e);
    }
  }, [setAppVersion]);

  const checkForUpdates = useCallback(async () => {
    try {
      const info = await commands.checkForUpdates();
      if (info) {
        // Respect dismissed version
        const dismissed = appSettings?.dismissed_update_version;
        if (dismissed && dismissed === info.version) {
          setUpdateInfo(null);
          return null;
        }
      }
      setUpdateInfo(info);
      return info;
    } catch (e) {
      console.error("Failed to check for updates:", e);
      return null;
    }
  }, [setUpdateInfo, appSettings?.dismissed_update_version]);

  const startPeriodicCheck = useCallback(() => {
    if (intervalRef.current) return;
    intervalRef.current = setInterval(() => {
      if (appSettings?.auto_check_updates !== false) {
        checkForUpdates();
      }
    }, CHECK_INTERVAL_MS);
    return () => {
      if (intervalRef.current) {
        clearInterval(intervalRef.current);
        intervalRef.current = null;
      }
    };
  }, [checkForUpdates, appSettings?.auto_check_updates]);

  return {
    updateInfo,
    appVersion,
    loadVersion,
    checkForUpdates,
    startPeriodicCheck,
  };
}