/**
 * Hook برای ارتباط دو طرفه با Flutter WebView
 * دریافت و ارسال ایونت‌ها
 */

import { useEffect, useRef, useState } from "react";

// تایپ‌های ایونت‌های دریافتی از Flutter
export type FlutterEventType =
  | "LAYOUT_CHANGED"
  | "KEYBOARD_CHANGED"
  | "SAFE_AREA_CHANGED"
  | "ORIENTATION_CHANGED"
  | "SCREEN_SIZE_CHANGED"
  | "INITIAL_CONFIG";

export interface FlutterEvent {
  type: FlutterEventType;
  payload: any;
  timestamp?: number;
}

// تایپ‌های ایونت‌های ارسالی به Flutter
export type WebEventType =
  | "WEB_READY"
  | "REQUEST_LOCATION"
  | "REQUEST_CONSULTANT"
  | "PAGE_LOADED"
  | "ERROR_OCCURRED";

export interface WebEvent {
  type: WebEventType;
  payload?: any;
  timestamp: number;
}

interface UseFlutterBridgeOptions {
  onEvent?: (event: FlutterEvent) => void;
  enableLogging?: boolean;
}

interface UseFlutterBridgeReturn {
  // دریافت ایونت‌ها
  events: FlutterEvent[];
  lastEvent: FlutterEvent | null;

  // ارسال ایونت‌ها
  sendToFlutter: (type: WebEventType, payload?: any) => void;

  // آماده بودن
  isReady: boolean;

  // لاگ‌ها
  logs: string[];
}

/**
 * نگاشت ایونت‌های وب به اکشن‌های واقعی Flutter.
 * اپ Flutter (najm) فقط کانال `HabibApp` را ثبت می‌کند و پیام‌هایی با
 * فرمت `{ action, data }` را می‌فهمد. کانال `FlutterChannel` در Flutter
 * وجود ندارد، بنابراین تنها مسیر معتبر ارسال، همین کانال است.
 */
const WEB_EVENT_TO_ACTION: Record<WebEventType, string> = {
  WEB_READY: "web_ready",
  REQUEST_LOCATION: "get_location",
  REQUEST_CONSULTANT: "open_consultant_page",
  PAGE_LOADED: "page_loaded",
  ERROR_OCCURRED: "error_occurred",
};

export function useFlutterBridge(
  options: UseFlutterBridgeOptions = {},
): UseFlutterBridgeReturn {
  const { onEvent, enableLogging = true } = options;

  const [events, setEvents] = useState<FlutterEvent[]>([]);
  const [lastEvent, setLastEvent] = useState<FlutterEvent | null>(null);
  const [isReady, setIsReady] = useState(false);
  const [logs, setLogs] = useState<string[]>([]);

  const logsRef = useRef<string[]>([]);

  // تابع کمکی برای اضافه کردن لاگ
  const addLog = (
    message: string,
    type: "info" | "success" | "error" = "info",
  ) => {
    const timestamp = new Date().toLocaleTimeString("fa-IR");
    const logMessage = `[${timestamp}] [${type.toUpperCase()}] ${message}`;

    if (enableLogging) {
      console.log(logMessage);
    }

    logsRef.current = [...logsRef.current, logMessage].slice(-50); // نگه داشتن 50 لاگ آخر
    setLogs(logsRef.current);
  };

  // تابع ارسال ایونت به Flutter
  const sendToFlutter = (type: WebEventType, payload?: any) => {
    if (typeof window === "undefined") return;

    const action = WEB_EVENT_TO_ACTION[type];
    let delivered = false;

    try {
      // روش اصلی و واقعی: کانال HabibApp با فرمت { action, data }
      // این تنها کانالی است که اپ Flutter ثبت کرده و به آن گوش می‌دهد.
      if (window.HabibApp?.postMessage) {
        const message =
          payload !== undefined ? { action, data: payload } : { action };
        window.HabibApp.postMessage(JSON.stringify(message));
        delivered = true;
        addLog(
          `📤 ارسال به Flutter (HabibApp): ${type} → ${action}`,
          "success",
        );
      }

      // مسیرهای fallback فقط برای محیط توسعه/iframe (در WebView واقعی Flutter وجود ندارند)
      const event: WebEvent = { type, payload, timestamp: Date.now() };

      if (window.parent && window.parent !== window) {
        window.parent.postMessage(event, "*");
        delivered = true;
      }

      if ((window as any).FlutterChannel) {
        (window as any).FlutterChannel.postMessage(JSON.stringify(event));
        delivered = true;
      }

      if ((window as any).webkit?.messageHandlers?.FlutterChannel) {
        (window as any).webkit.messageHandlers.FlutterChannel.postMessage(
          event,
        );
        delivered = true;
      }

      if (!delivered) {
        addLog(`⚠️ محیط Flutter یافت نشد - در حالت توسعه`, "info");
      }
    } catch (error) {
      addLog(`❌ خطا در ارسال به Flutter: ${error}`, "error");
      console.error("Error sending to Flutter:", error);
    }
  };

  // Listen کردن به ایونت‌های Flutter
  useEffect(() => {
    addLog("🚀 شروع listening به ایونت‌های Flutter", "info");

    const handleFlutterEvent = (event: MessageEvent) => {
      try {
        const data =
          typeof event.data === "string" ? JSON.parse(event.data) : event.data;

        // چک کردن اینکه ایونت از Flutter است
        if (data && data.type) {
          const flutterEvent: FlutterEvent = {
            type: data.type,
            payload: data.payload,
            timestamp: data.timestamp || Date.now(),
          };

          addLog(`📥 دریافت از Flutter: ${data.type}`, "success");

          setEvents((prev) => [...prev, flutterEvent].slice(-20)); // نگه داشتن 20 ایونت آخر
          setLastEvent(flutterEvent);

          // Handle INITIAL_CONFIG
          if (data.type === "INITIAL_CONFIG") {
            setIsReady(true);
            addLog("✅ WebView آماده شد", "success");
          }

          // Callback
          if (onEvent) {
            onEvent(flutterEvent);
          }
        }
      } catch (error) {
        addLog(`❌ خطا در parse ایونت Flutter: ${error}`, "error");
        console.error("Error parsing Flutter event:", error);
      }
    };

    // Listen به message event
    window.addEventListener("message", handleFlutterEvent);

    // Listen به custom events
    const handleCustomEvent = (event: Event) => {
      const customEvent = event as CustomEvent;
      if (customEvent.detail) {
        handleFlutterEvent({
          data: customEvent.detail,
        } as MessageEvent);
      }
    };

    window.addEventListener(
      "flutterConfig",
      handleCustomEvent as EventListener,
    );
    window.addEventListener("flutterEvent", handleCustomEvent as EventListener);

    // Cleanup
    return () => {
      window.removeEventListener("message", handleFlutterEvent);
      window.removeEventListener(
        "flutterConfig",
        handleCustomEvent as EventListener,
      );
      window.removeEventListener(
        "flutterEvent",
        handleCustomEvent as EventListener,
      );
      addLog("🛑 متوقف کردن listening", "info");
    };
  }, [onEvent, enableLogging]);

  // Detect HabibApp bridge availability and set isReady state.
  // web_ready delivery is owned exclusively by the root bootstrap script
  // in layout.tsx — this hook must NOT independently send web_ready.
  useEffect(() => {
    if (typeof window === "undefined") return;

    if (window.HabibApp?.postMessage) {
      setIsReady(true);
      return;
    }

    let interval: ReturnType<typeof setInterval> | undefined;
    let timeout: ReturnType<typeof setTimeout> | undefined;

    interval = setInterval(() => {
      if (window.HabibApp?.postMessage) {
        setIsReady(true);
        if (interval) clearInterval(interval);
      }
    }, 100);
    timeout = setTimeout(() => {
      if (interval) clearInterval(interval);
    }, 5000);

    return () => {
      if (interval) clearInterval(interval);
      if (timeout) clearTimeout(timeout);
    };
  }, []);

  // گوش‌دادن به پاسخ‌های واقعی Flutter از مسیر window.onFlutterResponse.
  // رسیدن هر پاسخ یعنی ارتباط دوطرفه برقرار است.
  useEffect(() => {
    if (typeof window === "undefined") return;

    const unsubscribe = window.addFlutterResponseListener?.((response) => {
      setIsReady(true);

      const flutterEvent: FlutterEvent = {
        type: "INITIAL_CONFIG",
        payload: response,
        timestamp: response?.data?.timestamp || Date.now(),
      };

      addLog(`📥 پاسخ از Flutter: ${response?.action}`, "success");
      setEvents((prev) => [...prev, flutterEvent].slice(-20));
      setLastEvent(flutterEvent);
      onEvent?.(flutterEvent);
    });

    return () => {
      unsubscribe?.();
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [onEvent]);

  return {
    events,
    lastEvent,
    sendToFlutter,
    isReady,
    logs,
  };
}