"use client";
import { useState, useEffect, useRef, useCallback } from "react";
import { useSession } from "next-auth/react";
import { useRouter } from "next/navigation";
import Link from "next/link";
import styles from "./map.module.css";
import {
  getHuntTimer,
  setHuntTimer,
  clearHuntTimer,
  formatElapsedTime,
  syncTimerWithServer,
} from "@/utils/timerService";

export default function MapPage() {
  const { data: session, status } = useSession();
  const [loading, setLoading] = useState(true);
  const [mapError, setMapError] = useState(false);
  const [error, setError] = useState(null);
  const [teamData, setTeamData] = useState(null);
  const [elapsedTime, setElapsedTime] = useState("00:00:00");
  const [clues, setClues] = useState([]);
  const mapContainerRef = useRef(null);
  const router = useRouter();
  const isMounted = useRef(true);

  // Add local state for hunt active status
  const [huntActive, setHuntActive] = useState(null);

  // Use useCallback for functions called in useEffect to avoid dependency issues
  const softRedirect = useCallback(
    (url) => {
      if (isMounted.current) {
        router.push(url);
      }
    },
    [router]
  );

  // Hard redirect function (for when a full page reload is needed)
  const hardRedirect = useCallback((url) => {
    window.location.href = url;
  }, []);

  // Enhanced fetchTeamData function
  const fetchTeamData = useCallback(async () => {
    try {
      const response = await fetch("/api/user/team", {
        method: "GET",
        headers: {
          "Content-Type": "application/json",
          "Cache-Control": "no-cache, no-store, must-revalidate",
          Pragma: "no-cache",
        },
        credentials: "include",
      });

      if (response.status === 401) {
        softRedirect("/login");
        return null;
      }

      if (response.status === 404) {
        softRedirect("/team-selection");
        return null;
      }

      if (!response.ok) {
        throw new Error("Failed to fetch team data");
      }

      const data = await response.json();
      console.log("Team data loaded:", data);
      setTeamData(data);
      return data;
    } catch (err) {
      console.error("Failed to fetch team data:", err);
      setError(err.message);
      return null;
    }
  }, [softRedirect]);

  // Fetch all clues with their status
  const fetchClues = useCallback(async () => {
    try {
      const response = await fetch("/api/clues", {
        method: "GET",
        headers: {
          "Content-Type": "application/json",
          "Cache-Control": "no-cache, no-store, must-revalidate",
          Pragma: "no-cache",
        },
        credentials: "include",
      });

      if (!response.ok) {
        throw new Error("Failed to fetch clues");
      }

      const data = await response.json();

      // Process the clues to determine which are available
      // A clue is available if it's either found already or the next in sequence
      const processedClues = data.map((clue, index, arr) => {
        // Find the first unfound clue's index
        const firstUnfoundIndex = arr.findIndex((c) => !c.found);

        // A clue is available if:
        // 1. It's already found, OR
        // 2. It's the next unfound clue in the sequence
        const available = clue.found || index === firstUnfoundIndex;

        return { ...clue, available };
      });

      setClues(processedClues);
      setLoading(false); // Set loading to false after clues are fetched
      return processedClues;
    } catch (err) {
      console.error("Failed to fetch clues:", err);
      setError(err.message);
      return [];
    }
  }, []);

  // Handle clue button click
  const handleClueClick = useCallback(
    (clueId, isAvailable, isFound) => {
      if (isFound || isAvailable) {
        router.push(`/clue/${clueId}`);
      } else {
        alert("Complete previous clues to unlock this one!");
      }
    },
    [router]
  );

  // Size and position the overlay to match the map image
  const setupOverlay = useCallback(() => {
    const overlay = document.getElementById("map-overlay-container");
    const mapImg = document.getElementById("treasure-map-img");

    if (overlay && mapImg) {
      // Wait for the image to load to get its dimensions
      mapImg.onload = () => {
        const mapRect = mapImg.getBoundingClientRect();
        overlay.style.width = `${mapRect.width}px`;
        overlay.style.height = `${mapRect.height}px`;
      };

      // Handle resize events
      const resizeOverlay = () => {
        const mapRect = mapImg.getBoundingClientRect();
        overlay.style.width = `${mapRect.width}px`;
        overlay.style.height = `${mapRect.height}px`;
      };

      // Initial resize and listen for window resize
      setTimeout(resizeOverlay, 300);
      window.addEventListener("resize", resizeOverlay);

      return () => {
        window.removeEventListener("resize", resizeOverlay);
      };
    }
  }, []);

  // Add this useEffect to coordinate loading the map and clues
  useEffect(() => {
    if (status === "authenticated") {
      fetchClues();
      fetchTeamData();
    } else if (status === "unauthenticated") {
      softRedirect("/login");
    }

    // Setup cleanup function for component unmount
    return () => {
      isMounted.current = false;
    };
  }, [status, fetchClues, fetchTeamData, softRedirect]);

  // Setup the overlay when the component is mounted
  useEffect(() => {
    if (!loading && clues.length > 0) {
      return setupOverlay();
    }
  }, [loading, clues.length, setupOverlay]);

  // Function to check hunt status and timer
  async function checkHuntAndTimer() {
    try {
      const response = await fetch("/api/hunt-status", {
        method: "GET",
        headers: {
          "Content-Type": "application/json",
          "Cache-Control": "no-cache, no-store, must-revalidate",
          Pragma: "no-cache",
        },
        credentials: "include",
      });

      if (response.ok) {
        const data = await response.json();
        setHuntActive(data.active);

        // If hunt is active, ensure we have timer data
        if (data.active && data.startTime) {
          setHuntTimer(data.startTime);
        }
      }
    } catch (err) {
      console.error("Failed to check hunt status:", err);
    }
  }

  // Add this function before it's used in initializeTimer
  async function fetchTeamHuntStartTime() {
    try {
      // First try to get any existing timer data
      const timerData = getHuntTimer();
      if (timerData && timerData.startTime) {
        return true;
      }

      // If no timer data exists, sync with server
      const result = await syncTimerWithServer();
      return result.success;
    } catch (err) {
      console.error("Error fetching team hunt start time:", err);
      return false;
    }
  }

  // Use team hunt start time for elapsed time calculation
  useEffect(() => {
    let timerId;

    // Initialize timer
    async function initializeTimer() {
      // First ensure we have timer data
      await fetchTeamHuntStartTime();

      // Set up timer updates
      const updateTimer = () => {
        const timerData = getHuntTimer();
        if (timerData && timerData.startTime) {
          setElapsedTime(formatElapsedTime(timerData.startTime));
        }
      };

      // Initial update
      updateTimer();

      // Update every second
      timerId = setInterval(updateTimer, 1000);
    }

    initializeTimer();

    // Clean up interval on unmount
    return () => {
      if (timerId) clearInterval(timerId);
    };
  }, []);

  // Check hunt status every 10 seconds to ensure immediate updates
  useEffect(() => {
    // Initial check
    checkHuntAndTimer();

    // Set up interval to check hunt status
    const huntStatusInterval = setInterval(checkHuntAndTimer, 10000);

    return () => {
      clearInterval(huntStatusInterval);
    };
  }, [softRedirect, hardRedirect]);

  // Add useEffect to load team data
  useEffect(() => {
    if (status === "authenticated") {
      fetchTeamData();
    }
  }, [status, fetchTeamData]);

  if (status === "loading" || loading) {
    return (
      <div className={styles["loading-container"]}>
        <div className={styles["loading-spinner"]}></div>
        <div>Loading map...</div>
      </div>
    );
  }

  // If hunt status is known to be inactive, show message
  if (huntActive === false) {
    return (
      <div className={styles["map-error"]}>
        <h2>Hunt Not Active</h2>
        <p>The treasure hunt has not started yet.</p>
        <button onClick={() => softRedirect("/waiting")}>
          Go to Waiting Room
        </button>
      </div>
    );
  }

  if (error) {
    return (
      <div className={styles["map-error"]}>
        <h2>Error</h2>
        <p>{error}</p>
        <button onClick={fetchTeamData}>Retry</button>
      </div>
    );
  }

  if (mapError) {
    return (
      <div className={styles["map-error"]}>
        <h2>Error Loading Map</h2>
        <p>We couldn't load the treasure map. Please try again.</p>
        <button onClick={fetchClues}>Retry</button>
      </div>
    );
  }

  // Function to determine clue button class based on status
  const getClueButtonClass = (clue) => {
    if (clue.found) return `${styles["clue-button"]} ${styles["clue-found"]}`;
    if (clue.available)
      return `${styles["clue-button"]} ${styles["clue-available"]}`;
    return `${styles["clue-button"]} ${styles["clue-locked"]}`;
  };

  // Get the first clue if it exists
  const firstClue = clues.length > 0 ? clues[0] : null;

  return (
    <div className={styles["map-page"]}>
      {/* Map Banner with team info and timer */}
      <div className={styles["map-banner"]}>
        <div className={styles["team-name"]}>
          {teamData?.team?.name || "Loading..."}
        </div>
        <div className={styles["elapsed-time"]}>
          <span className={styles["time-value"]}>{elapsedTime}</span>
        </div>
        <div className={styles["team-code"]}>{teamData?.team?.code || ""}</div>
      </div>

      {/* Main map content area */}
      <div className={styles["map-container"]} ref={mapContainerRef}>
        <div className={styles["treasure-map"]}>
          {/* Simpler map implementation using an img element */}
          <div className={styles["map-image-container"]}>
            <img
              id="treasure-map-img"
              src="/images/map.svg"
              alt="Treasure Map"
              className={styles["map-image"]}
            />

            {/* Overlay div with the clue button - positioned exactly over the map */}
            <div id="map-overlay-container" className={styles["map-overlay"]}>
              {/* Hardcoded Clue 1 button */}
              {firstClue && (
                <button
                  className={getClueButtonClass(firstClue)}
                  onClick={() =>
                    handleClueClick(
                      firstClue.id,
                      firstClue.available,
                      firstClue.found
                    )
                  }
                  style={{
                    left: "150px",
                    top: "200px",
                  }}
                >
                  Clue {firstClue.id}
                </button>
              )}
            </div>
          </div>
        </div>
      </div>

      {/* Navigation bar */}
      <nav className={styles["nav-bar"]}>
        <Link
          href="/map"
          className={`${styles["nav-item"]} ${styles["active"]}`}
        >
          <div className={styles["nav-icon"]}>🗺️</div>
          <div className={styles["nav-label"]}>Map</div>
        </Link>
        <Link href="/stats" className={styles["nav-item"]}>
          <div className={styles["nav-icon"]}>📊</div>
          <div className={styles["nav-label"]}>Stats</div>
        </Link>
        <Link
          href={teamData?.team ? `/${teamData.team.id}` : "/team-selection"}
          className={styles["nav-item"]}
        >
          <div className={styles["nav-icon"]}>👥</div>
          <div className={styles["nav-label"]}>Team</div>
        </Link>
        <Link href="/leaderboard" className={styles["nav-item"]}>
          <div className={styles["nav-icon"]}>🏆</div>
          <div className={styles["nav-label"]}>Leaderboard</div>
        </Link>
      </nav>
    </div>
  );
}