"use client";

import { useState, useEffect } from 'react';
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { auth } from '@/lib/firebase/config';
import { toast } from 'sonner';
import { Users, UserPlus, Crown, Mail } from 'lucide-react';
import { useParams } from 'next/navigation';

interface WorkspaceUser {
  id: string;
  email: string;
  displayName: string;
  role: 'owner' | 'admin' | 'member';
  joinedAt: any;
  lastActive: any;
}

export default function UsersPage() {
  const params = useParams();
  const workspace = params.workspace as string;
  const [users, setUsers] = useState<WorkspaceUser[]>([]);
  const [loading, setLoading] = useState(true);
  const [currentUser, setCurrentUser] = useState<WorkspaceUser | null>(null);

  useEffect(() => {
    loadUsers();
  }, []);

  const loadUsers = async () => {
    try {
      const user = auth.currentUser;
      if (!user) return;

      const token = await user.getIdToken();
      const response = await fetch(`/api/workspace/${workspace}/users`, {
        headers: {
          'Authorization': `Bearer ${token}`,
        },
      });

      if (response.ok) {
        const data = await response.json();
        setUsers(data.users);
        setCurrentUser(data.currentUser);
      }
    } catch (error) {
      console.error('Error loading users:', error);
      toast.error('Failed to load workspace users');
    } finally {
      setLoading(false);
    }
  };

  const getRoleBadgeColor = (role: string) => {
    switch (role) {
      case 'owner':
        return 'bg-purple-500/10 text-purple-600 border-purple-500/20';
      case 'admin':
        return 'bg-blue-500/10 text-blue-600 border-blue-500/20';
      default:
        return 'bg-gray-500/10 text-gray-600 border-gray-500/20';
    }
  };

  return (
    <div className="flex h-full flex-col overflow-auto">
      <div className="flex-1 p-8 space-y-8 max-w-6xl">
        {/* Header */}
        <div className="flex items-center justify-between">
          <div>
            <h1 className="text-4xl font-bold mb-2">Team Members</h1>
            <p className="text-muted-foreground text-lg">
              Manage workspace access and team collaboration
            </p>
          </div>
          <Button disabled>
            <UserPlus className="mr-2 h-4 w-4" />
            Invite User
          </Button>
        </div>

        {/* Current User Info */}
        {currentUser && (
          <Card className="border-primary/50 bg-primary/5">
            <CardHeader>
              <CardTitle className="text-base flex items-center gap-2">
                <Crown className="h-4 w-4" />
                Your Account
              </CardTitle>
            </CardHeader>
            <CardContent>
              <div className="flex items-center justify-between">
                <div>
                  <p className="font-medium">{currentUser.displayName || 'Unknown'}</p>
                  <p className="text-sm text-muted-foreground">{currentUser.email}</p>
                </div>
                <div className={`px-3 py-1 rounded-full text-xs font-medium border ${getRoleBadgeColor(currentUser.role)}`}>
                  {currentUser.role}
                </div>
              </div>
            </CardContent>
          </Card>
        )}

        {/* Users List */}
        {loading ? (
          <Card>
            <CardContent className="pt-6">
              <p className="text-center text-muted-foreground">Loading team members...</p>
            </CardContent>
          </Card>
        ) : users.length === 0 ? (
          <Card>
            <CardContent className="pt-6 text-center space-y-4">
              <div className="flex justify-center">
                <div className="h-16 w-16 rounded-full bg-muted flex items-center justify-center">
                  <Users className="h-8 w-8 text-muted-foreground" />
                </div>
              </div>
              <div>
                <h3 className="text-lg font-semibold mb-2">No team members yet</h3>
                <p className="text-sm text-muted-foreground mb-4">
                  Invite team members to collaborate on projects in this workspace
                </p>
                <Button disabled>
                  <UserPlus className="mr-2 h-4 w-4" />
                  Invite Your First Team Member
                </Button>
              </div>
            </CardContent>
          </Card>
        ) : (
          <div className="space-y-3">
            {users.map((user) => (
              <Card key={user.id}>
                <CardContent className="pt-6">
                  <div className="flex items-center justify-between">
                    <div className="flex items-center gap-4">
                      <div className="h-12 w-12 rounded-full bg-primary/10 flex items-center justify-center">
                        <Mail className="h-5 w-5 text-primary" />
                      </div>
                      <div>
                        <p className="font-medium">{user.displayName || 'Unknown'}</p>
                        <p className="text-sm text-muted-foreground">{user.email}</p>
                        {user.lastActive && (
                          <p className="text-xs text-muted-foreground mt-1">
                            Last active: {new Date(user.lastActive._seconds * 1000).toLocaleDateString()}
                          </p>
                        )}
                      </div>
                    </div>
                    <div className="flex items-center gap-3">
                      <div className={`px-3 py-1 rounded-full text-xs font-medium border ${getRoleBadgeColor(user.role)}`}>
                        {user.role}
                      </div>
                    </div>
                  </div>
                </CardContent>
              </Card>
            ))}
          </div>
        )}

        {/* Info Card */}
        <Card className="border-blue-500/20 bg-blue-500/5">
          <CardHeader>
            <CardTitle className="text-base">Team Collaboration (Coming Soon)</CardTitle>
          </CardHeader>
          <CardContent className="space-y-2 text-sm text-muted-foreground">
            <p>
              <strong>👥 Team Workspaces:</strong> Invite team members to collaborate on projects together.
            </p>
            <p>
              <strong>🔐 Role-Based Access:</strong> Control what team members can see and do with flexible permissions.
            </p>
            <p>
              <strong>💬 Shared Context:</strong> All team members can access shared AI chat history and project documentation.
            </p>
            <p className="text-xs italic pt-2">
              This feature is currently in development. Check back soon!
            </p>
          </CardContent>
        </Card>
      </div>
    </div>
  );
}