"use client";
import { useEffect, useState } from "react";
import { useRouter } from "next/navigation";
import { useSession } from "next-auth/react";
import styles from "./waiting.module.css";
import { setHuntTimer, clearHuntTimer } from "@/utils/timerService";

export default function WaitingPage() {
  const router = useRouter();
  const { status } = useSession();
  const [huntActive, setHuntActive] = useState(false);
  const [huntEnded, setHuntEnded] = useState(false);
  const [loading, setLoading] = useState(true);
  const [lastHuntData, setLastHuntData] = useState(null);

  // Check hunt status VERY aggressively
  useEffect(() => {
    let redirectAttempted = false;
    let lastKnownHuntStatus = false;
    let lastHuntData = null;

    async function checkHuntStatus() {
      if (redirectAttempted) return;

      try {
        // First check if we have a team ID from the session
        const userResponse = await fetch("/api/user", {
          method: "GET",
          headers: {
            "Cache-Control": "no-store, no-cache, must-revalidate",
            Pragma: "no-cache",
          },
          credentials: "include",
        });

        if (userResponse.ok) {
          const userData = await userResponse.json();

          // If user has a team, check if that team has an active hunt session
          if (userData.teamId) {
            const teamHuntResponse = await fetch(
              `/api/teams/${userData.teamId}/hunt-session`,
              {
                method: "GET",
                headers: {
                  "Cache-Control": "no-store, no-cache, must-revalidate",
                  Pragma: "no-cache",
                },
                credentials: "include",
              }
            );

            // If team has an active hunt session, redirect to map
            if (teamHuntResponse.ok) {
              const teamHuntData = await teamHuntResponse.json();
              if (teamHuntData.startTime) {
                // Store the start time in the centralized timer service
                setHuntTimer(teamHuntData.startTime);

                console.log("Team hunt is active! Redirecting to map...");
                redirectAttempted = true;
                lastKnownHuntStatus = true;

                // Show loading screen and redirect
                document.body.innerHTML =
                  '<div style="display:flex;justify-content:center;align-items:center;height:100vh;font-family:sans-serif;"><div style="text-align:center"><div style="font-size:24px">Loading Map...</div><div style="margin-top:20px">Please wait...</div></div></div>';
                window.location.href = "/map";
                return;
              }
            }
          }
        }

        // Fall back to checking the global hunt status
        const timestamp = Date.now();
        const globalResponse = await fetch(`/api/hunt-status?_t=${timestamp}`, {
          method: "GET",
          headers: {
            "Content-Type": "application/json",
            "Cache-Control": "no-store, no-cache, must-revalidate",
            Pragma: "no-cache",
          },
        });

        if (globalResponse.ok) {
          const data = await globalResponse.json();
          console.log("Hunt status check result:", data);

          // Store the most recent hunt data to determine if hunt ended
          if (lastHuntData && lastHuntData.active && !data.active) {
            // Hunt was active before but now it's not - it has ended
            console.log("Hunt has ended! Showing leaderboard...");
            setHuntEnded(true);

            // Clear any timer data
            clearHuntTimer();

            // Redirect to leaderboard after a brief delay
            setTimeout(() => {
              window.location.href = "/leaderboard?huntEnded=true";
            }, 2000);

            return;
          }

          // If this is a new session but we detect signs of a hunt that ended
          if (!lastHuntData && !data.active && data.startTime && data.endTime) {
            // Handle case where user lands directly on waiting page after hunt ended
            console.log("Hunt appears to have already ended");
            setHuntEnded(true);

            // Redirect to leaderboard after a brief delay
            setTimeout(() => {
              window.location.href = "/leaderboard?huntEnded=true";
            }, 2000);

            return;
          }

          // Save the current hunt data for next comparison
          lastHuntData = data;

          if (data.active) {
            // Store the global start time in the centralized timer service
            if (data.startTime) {
              setHuntTimer(data.startTime, data.endTime);
            }

            console.log("Hunt is active! Redirecting immediately...");
            redirectAttempted = true;
            lastKnownHuntStatus = true;

            // Show loading screen during redirect
            document.body.innerHTML =
              '<div style="display:flex;justify-content:center;align-items:center;height:100vh;font-family:sans-serif;"><div style="text-align:center"><div style="font-size:24px">Loading Map...</div><div style="margin-top:20px">Please wait...</div></div></div>';
            window.location.href = "/map";
            return;
          }

          setHuntActive(data.active);
        }

        setLoading(false);
      } catch (err) {
        console.error("Error checking hunt status:", err);
        setLoading(false);
      }
    }

    // Check immediately and very frequently
    checkHuntStatus();
    const intervalId = setInterval(checkHuntStatus, 500); // Check every 500ms

    return () => clearInterval(intervalId);
  }, []);

  // Redirect to login if not authenticated
  useEffect(() => {
    if (status === "unauthenticated") {
      router.push("/login");
    }
  }, [status, router]);

  if (loading) {
    return (
      <div className={styles.container}>
        <div className={styles.spinner}></div>
        <h2>Loading...</h2>
      </div>
    );
  }

  return (
    <div className={styles.container}>
      {huntEnded ? (
        <>
          <h1>Hunt Has Ended</h1>
          <p>
            The treasure hunt has ended. You can view the results on the
            leaderboard.
          </p>
          <div className={styles.endedMessage}>
            <p>Hunt Complete!</p>
            <button onClick={() => router.push("/leaderboard?huntEnded=true")}>
              View Results
            </button>
          </div>
        </>
      ) : (
        <>
          <h1>Waiting for Hunt to Start</h1>
          <p>
            The treasure hunt has not started yet. Please wait for the
            administrator to start the hunt.
          </p>
          <div className={styles.waitingAnimation}>⏳</div>
          {huntActive && (
            <div className={styles.startedMessage}>
              <p>The hunt has started!</p>
              <button onClick={() => router.push("/map")}>Go to Map</button>
            </div>
          )}
        </>
      )}
    </div>
  );
}