import React, { useState, useEffect } from "react"
import { useAuth } from "../services/authService"

export default function SignInPage() {
  const [username, setUsername] = useState("")
  const [password, setPassword] = useState("")
  const [error, setError] = useState("")
  const { login, isAuthenticated, isLoading } = useAuth()

  useEffect(() => {
    // Redirect if already authenticated
    if (isAuthenticated) {
      window.location.href = "/"
    }
  }, [isAuthenticated])

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()
    setError("")

    const result = await login({ username, password })
    
    if (!result.success) {
      setError(result.error || "Invalid credentials")
    } else {
      // Redirect to main app
      window.location.href = "/"
    }
  }

  // Show loading spinner if checking auth state
  if (isLoading) {
    return (
      <div className="min-h-screen flex items-center justify-center bg-gray-900">
        <div className="text-white">Loading...</div>
      </div>
    )
  }

  return (
    <div className="min-h-screen flex items-center justify-center bg-gray-900">
      <div className="max-w-md w-full space-y-8 p-8">
        <div>
          <h2 className="mt-6 text-center text-3xl font-extrabold text-white">
            ACE UI Login
          </h2>
          <p className="mt-2 text-center text-sm text-gray-400">
            Enter your credentials to access the dashboard
          </p>
        </div>
        <form className="mt-8 space-y-6" onSubmit={handleSubmit}>
          <div className="space-y-4">
            <div>
              <label htmlFor="username" className="sr-only">
                Username
              </label>
              <input
                id="username"
                name="username"
                type="text"
                required
                className="relative block w-full px-3 py-2 border border-gray-600 rounded-md placeholder-gray-400 text-white bg-gray-800 focus:outline-none focus:ring-blue-500 focus:border-blue-500 focus:z-10 sm:text-sm"
                placeholder="Username"
                value={username}
                onChange={(e) => setUsername(e.target.value)}
              />
            </div>
            <div>
              <label htmlFor="password" className="sr-only">
                Password
              </label>
              <input
                id="password"
                name="password"
                type="password"
                required
                className="relative block w-full px-3 py-2 border border-gray-600 rounded-md placeholder-gray-400 text-white bg-gray-800 focus:outline-none focus:ring-blue-500 focus:border-blue-500 focus:z-10 sm:text-sm"
                placeholder="Password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
              />
            </div>
          </div>

          {error && (
            <div className="text-red-400 text-sm text-center">{error}</div>
          )}

          <div>
            <button
              type="submit"
              disabled={isLoading}
              className="group relative w-full flex justify-center py-2 px-4 border border-transparent text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500 disabled:opacity-50 disabled:cursor-not-allowed"
            >
              {isLoading ? "Signing in..." : "Sign in"}
            </button>
          </div>
        </form>
      </div>
    </div>
  )
}