"use client";

import { useState, FormEvent } from "react";
import { useRouter } from "next/navigation";
import { useAuth } from "@/lib/auth";
import { MessageSquare } from "lucide-react";

export default function RegisterPage() {
  const { register } = useAuth();
  const router = useRouter();
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [name, setName] = useState("");
  const [workspaceName, setWorkspaceName] = useState("");
  const [error, setError] = useState("");
  const [isLoading, setIsLoading] = useState(false);

  const MIN_PASSWORD_LENGTH = 8;

  const validatePassword = (pwd: string): string | null => {
    if (pwd.length < MIN_PASSWORD_LENGTH) {
      return `Password must be at least ${MIN_PASSWORD_LENGTH} characters long.`;
    }
    if (!/[A-Za-z]/.test(pwd) || !/[0-9]/.test(pwd)) {
      return "Password must contain at least one letter and one number.";
    }
    return null;
  };

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

    const pwdError = validatePassword(password);
    if (pwdError) {
      setError(pwdError);
      return;
    }

    setIsLoading(true);
    try {
      await register(email, password, name, workspaceName);
      router.push("/chat");
    } catch (err: any) {
      const status = err.response?.status;
      if (status === 409) {
        setError("An account with this email already exists.");
      } else if (status === 429) {
        setError("Too many attempts. Please try again later.");
      } else if (status >= 500) {
        setError("Server error. Please try again later.");
      } else {
        setError("Registration failed. Please check your information and try again.");
      }
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <div className="min-h-screen flex flex-col bg-white">
      {/* Header */}
      <header className="flex items-center justify-center py-8 bg-slack-purple">
        <div className="flex items-center gap-2 text-white">
          <MessageSquare size={28} />
          <span className="text-xl font-bold">ChatApp</span>
        </div>
      </header>

      {/* Form */}
      <div className="flex-1 flex items-center justify-center px-4 py-12 bg-[#f9f9f9]">
        <div className="w-full max-w-md bg-white rounded-lg shadow-sm border border-gray-200 p-8">
          <h1 className="text-2xl font-bold text-gray-900 mb-2">Create your ChatApp account</h1>
          <p className="text-sm text-gray-500 mb-6">
            Sign up to start collaborating with your team.
          </p>

          {error && (
            <div className="mb-4 p-3 rounded-md bg-red-50 border border-red-200 text-red-700 text-sm">
              {error}
            </div>
          )}

          <form onSubmit={handleSubmit} className="space-y-4">
            <div>
              <label htmlFor="name" className="block text-sm font-semibold text-gray-700 mb-1">
                Full name
              </label>
              <input
                id="name"
                type="text"
                value={name}
                onChange={(e) => setName(e.target.value)}
                required
                placeholder="Jane Doe"
                className="w-full px-3 py-2 rounded-md border border-gray-300 focus:outline-none focus:ring-2 focus:ring-slack-purple focus:border-transparent"
                autoComplete="name"
              />
            </div>

            <div>
              <label htmlFor="email" className="block text-sm font-semibold text-gray-700 mb-1">
                Email address
              </label>
              <input
                id="email"
                type="email"
                value={email}
                onChange={(e) => setEmail(e.target.value)}
                required
                placeholder="you@example.com"
                className="w-full px-3 py-2 rounded-md border border-gray-300 focus:outline-none focus:ring-2 focus:ring-slack-purple focus:border-transparent"
                autoComplete="email"
              />
            </div>

            <div>
              <label htmlFor="password" className="block text-sm font-semibold text-gray-700 mb-1">
                Password
              </label>
              <input
                id="password"
                type="password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                required
                placeholder="••••••••"
                className="w-full px-3 py-2 rounded-md border border-gray-300 focus:outline-none focus:ring-2 focus:ring-slack-purple focus:border-transparent"
                autoComplete="new-password"
              />
            </div>

            <div>
              <label htmlFor="workspace" className="block text-sm font-semibold text-gray-700 mb-1">
                Workspace name
              </label>
              <input
                id="workspace"
                type="text"
                value={workspaceName}
                onChange={(e) => setWorkspaceName(e.target.value)}
                required
                placeholder="My Company"
                className="w-full px-3 py-2 rounded-md border border-gray-300 focus:outline-none focus:ring-2 focus:ring-slack-purple focus:border-transparent"
              />
            </div>

            <button
              type="submit"
              disabled={isLoading}
              className="w-full py-2.5 px-4 rounded-md bg-slack-purple text-white font-semibold hover:bg-slack-darkpurple transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
            >
              {isLoading ? "Creating account..." : "Create account"}
            </button>
          </form>

          <div className="mt-6 pt-4 border-t border-gray-100 text-center text-sm text-gray-500">
            Already have an account?{" "}
            <a href="/login" className="text-slack-purple font-semibold hover:underline">
              Sign in
            </a>
          </div>
        </div>
      </div>

      <footer className="py-4 text-center text-xs text-gray-400">
        &copy; {new Date().getFullYear()} ChatApp. A Slack-like team communication app.
      </footer>
    </div>
  );
}