"use client";
import { useState, useEffect, useCallback } from "react";
import { useSession } from "next-auth/react";
import { useRouter } from "next/navigation";
import Link from "next/link";

export default function TeamPage({ params }) {
  const { status, data: session } = useSession();
  const [team, setTeam] = useState(null);
  const [teamMembers, setTeamMembers] = useState([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState("");
  const router = useRouter();
  const { teamId } = params;

  const fetchTeamData = useCallback(async () => {
    try {
      if (!teamId || isNaN(parseInt(teamId, 10))) {
        throw new Error("Invalid team ID");
      }

      console.log("Fetching team data for team ID:", teamId);

      const response = await fetch(`/api/teams/${teamId}`, {
        method: "GET",
        headers: {
          "Content-Type": "application/json",
        },
        credentials: "include",
      });

      if (!response.ok) {
        const text = await response.text();
        let errorMessage;
        try {
          const errorData = JSON.parse(text);
          errorMessage = errorData.error || "Failed to fetch team data";
        } catch (unused) {
          errorMessage = `Failed to fetch team data: ${
            response.status
          } ${text.slice(0, 100)}`;
        }
        throw new Error(errorMessage);
      }

      const data = await response.json();
      console.log("Team data received:", data);

      if (!data.team) {
        throw new Error("Team not found");
      }

      setTeam(data.team);
      setTeamMembers(data.members || []);
      setError("");
    } catch (err) {
      console.error("Team page error:", err);
      setError(err.message);
      // If we get a 401 error, redirect to login
      if (err.message.includes("401")) {
        router.push("/login");
      }
    } finally {
      setLoading(false);
    }
  }, [teamId, router]);

  useEffect(() => {
    // Only attempt to fetch data when session is ready and we have a teamId
    if (status === "authenticated" && teamId) {
      console.log("Session authenticated, fetching team data");
      fetchTeamData();
    } else if (status === "unauthenticated") {
      console.log("User not authenticated, redirecting to login");
      router.push("/login");
    }
  }, [teamId, status, fetchTeamData, router]);

  if (status === "loading" || loading) {
    return (
      <div className="loading-container">
        <div className="loading-spinner"></div>
        <div className="loading-text">Loading team data...</div>
      </div>
    );
  }

  if (error) {
    return (
      <div className="error-container">
        <div className="error-icon">⚠️</div>
        <div className="error-message">Error: {error}</div>
        <Link href="/team-selection">
          <button className="back-button">Back to Team Selection</button>
        </Link>
      </div>
    );
  }

  if (!team) {
    return (
      <div className="error-container">
        <div className="error-icon">🔍</div>
        <div className="error-message">Team not found</div>
        <Link href="/team-selection">
          <button className="back-button">Back to Team Selection</button>
        </Link>
      </div>
    );
  }

  return (
    <div className="team-page">
      <div className="team-banner">
        <Link href="/team-selection" className="back-button">
          ←
        </Link>
        <div className="team-info">
          <h1 className="team-name">{team.name}</h1>
          <div className="team-code">Team Code: {team.code}</div>
        </div>
      </div>

      <div className="members-container">
        <h2 className="members-title">Team Members</h2>

        {teamMembers.length > 0 ? (
          <div className="members-list">
            {teamMembers.map((member) => (
              <div key={member.id} className="member-card">
                <div className="member-avatar">👤</div>
                <div className="member-details">
                  <div className="member-name">
                    {member.username}
                    {member.id === session?.user?.id && " (You)"}
                  </div>
                </div>
              </div>
            ))}
          </div>
        ) : (
          <div className="empty-state">No team members found</div>
        )}

        <button
          className="add-member-button"
          onClick={() => router.push(`/team/${teamId}/add-user`)}
        >
          + Add Member
        </button>
      </div>

      <div className="team-actions">
        <button
          className="action-button leave-button"
          onClick={async () => {
            if (confirm("Are you sure you want to leave this team?")) {
              try {
                setLoading(true);
                const response = await fetch(`/api/teams/${teamId}/leave`, {
                  method: "POST",
                  headers: { "Content-Type": "application/json" },
                  credentials: "include",
                });

                if (response.ok) {
                  router.push("/team-selection");
                } else {
                  const error = await response.json();
                  throw new Error(error.message || "Failed to leave team");
                }
              } catch (err) {
                setError(err.message);
                setLoading(false);
              }
            }
          }}
        >
          Leave Team
        </button>

        {session?.user?.role === "admin" && (
          <button
            className="action-button start-button"
            onClick={async () => {
              try {
                setLoading(true);
                const response = await fetch(
                  `/api/teams/${teamId}/start-hunt`,
                  {
                    method: "POST",
                    headers: { "Content-Type": "application/json" },
                    credentials: "include",
                  }
                );

                if (response.ok) {
                  fetchTeamData();
                } else {
                  const error = await response.json();
                  throw new Error(error.message || "Failed to start hunt");
                }
              } catch (err) {
                setError(err.message);
                setLoading(false);
              }
            }}
          >
            Start Hunt
          </button>
        )}
      </div>

      <div className="nav-bar">
        <Link href="/dashboard" className="nav-item">
          <div className="nav-icon">🏠</div>
          <div className="nav-label">Home</div>
        </Link>
        <Link href="/leaderboard" className="nav-item">
          <div className="nav-icon">📊</div>
          <div className="nav-label">Stats</div>
        </Link>
        <Link href="/team-selection" className="nav-item active">
          <div className="nav-icon">👥</div>
          <div className="nav-label">Team</div>
        </Link>
        <Link href="/profile" className="nav-item">
          <div className="nav-icon">👤</div>
          <div className="nav-label">Profile</div>
        </Link>
      </div>

      <style jsx>{`
        .team-page {
          display: flex;
          flex-direction: column;
          min-height: 100vh;
          background-color: #f4f4f4;
          font-family: Arial, sans-serif;
        }

        .team-banner {
          background-color: #68543c;
          color: white;
          padding: 20px;
          position: relative;
          display: flex;
          align-items: center;
        }

        .back-button {
          text-decoration: none;
          color: white;
          font-size: 24px;
          margin-right: 15px;
          display: flex;
          align-items: center;
        }

        .team-info {
          flex: 1;
        }

        .team-name {
          margin: 0;
          font-size: 24px;
          font-weight: bold;
        }

        .team-code {
          margin-top: 5px;
          font-size: 14px;
          opacity: 0.8;
        }

        .members-container {
          padding: 20px;
          flex: 1;
        }

        .members-title {
          font-size: 18px;
          margin-bottom: 15px;
          color: #333;
        }

        .members-list {
          display: flex;
          flex-direction: column;
          gap: 10px;
        }

        .member-card {
          background-color: white;
          border-radius: 8px;
          padding: 15px;
          display: flex;
          align-items: center;
          box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }

        .member-avatar {
          font-size: 24px;
          margin-right: 15px;
        }

        .member-name {
          font-weight: 600;
        }

        .empty-state {
          text-align: center;
          padding: 30px;
          color: #888;
        }

        .add-member-button {
          background-color: #68543c;
          color: white;
          border: none;
          border-radius: 8px;
          padding: 15px;
          margin-top: 20px;
          width: 100%;
          font-size: 16px;
          font-weight: bold;
          cursor: pointer;
        }

        .team-actions {
          display: flex;
          gap: 10px;
          padding: 20px;
        }

        .action-button {
          flex: 1;
          padding: 15px;
          border: none;
          border-radius: 8px;
          font-weight: bold;
          cursor: pointer;
        }

        .leave-button {
          background-color: #f6bd60;
          color: #333;
        }

        .start-button {
          background-color: #588157;
          color: white;
        }

        .nav-bar {
          display: flex;
          justify-content: space-around;
          background-color: white;
          border-top: 1px solid #ddd;
          padding: 10px 0;
        }

        .nav-item {
          display: flex;
          flex-direction: column;
          align-items: center;
          text-decoration: none;
          color: #666;
          flex: 1;
          padding: 10px 0;
        }

        .nav-item.active {
          color: #68543c;
        }

        .nav-icon {
          font-size: 24px;
          margin-bottom: 5px;
        }

        .nav-label {
          font-size: 12px;
        }

        .loading-container,
        .error-container {
          display: flex;
          flex-direction: column;
          align-items: center;
          justify-content: center;
          height: 100vh;
          padding: 20px;
          text-align: center;
        }

        .loading-spinner {
          border: 4px solid #f3f3f3;
          border-top: 4px solid #68543c;
          border-radius: 50%;
          width: 40px;
          height: 40px;
          animation: spin 1s linear infinite;
          margin-bottom: 20px;
        }

        @keyframes spin {
          0% {
            transform: rotate(0deg);
          }
          100% {
            transform: rotate(360deg);
          }
        }

        .error-icon {
          font-size: 48px;
          margin-bottom: 20px;
        }

        .error-message {
          margin-bottom: 20px;
          color: #d32f2f;
        }
      `}</style>
    </div>
  );
}