"use client";
import { useState, useEffect } from "react";
import { useRouter, useSearchParams } from "next/navigation";
import Link from "next/link";
import { fetchClient } from "@/lib/api-client";
import { toast } from "sonner";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Loader2 } from "lucide-react";

interface Vendor {
  id: string;
  username: string;
}

export default function ResetPasswordPage() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const token = searchParams.get('token');
  
  const [vendor, setVendor] = useState<Vendor | null>(null);
  const [loading, setLoading] = useState(true);
  const [submitting, setSubmitting] = useState(false);
  const [password, setPassword] = useState("");
  const [confirmPassword, setConfirmPassword] = useState("");

  useEffect(() => {
    if (!token) {
      toast.error("No reset token provided");
      router.push("/auth/login");
      return;
    }

    validateToken();
  }, [token]);

  async function validateToken() {
    try {
      const data = await fetchClient<{ valid: boolean; vendor?: Vendor; message?: string }>(`/auth/validate-reset-token/${token}`);
      
      if (data.valid && data.vendor) {
        setVendor(data.vendor);
      } else {
        toast.error(data.message || "Invalid or expired token");
        router.push("/auth/login");
      }
    } catch (error: any) {
      toast.error("Failed to validate token");
      router.push("/auth/login");
    } finally {
      setLoading(false);
    }
  }

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    
    if (password !== confirmPassword) {
      toast.error("Passwords do not match");
      return;
    }
    
    if (password.length < 6) {
      toast.error("Password must be at least 6 characters");
      return;
    }

    setSubmitting(true);
    
    try {
      await fetchClient("/auth/reset-password", {
        method: "POST",
        body: { token, newPassword: password }
      });
      
      toast.success("Password reset successfully");
      router.push("/auth/login");
    } catch (error: any) {
      toast.error(error?.message || "Failed to reset password");
    } finally {
      setSubmitting(false);
    }
  }

  if (loading) {
    return (
      <div className="flex items-center justify-center min-h-screen bg-gray-100 dark:bg-[#0F0F12]">
        <div className="w-full max-w-md p-8 space-y-8 bg-white dark:bg-[#1F1F23] rounded-xl shadow-lg text-center">
          <div className="mt-6 flex flex-col items-center justify-center">
            <div className="w-12 h-12 border-4 border-t-blue-500 border-b-transparent border-l-transparent border-r-transparent rounded-full animate-spin"></div>
            <p className="mt-4 text-gray-600 dark:text-gray-400">Validating token...</p>
          </div>
        </div>
      </div>
    );
  }

  if (!vendor) {
    return null; // Will redirect
  }

  return (
    <div className="flex items-center justify-center min-h-screen bg-gray-100 dark:bg-[#0F0F12]">
      <div className="w-full max-w-md p-8 space-y-8 bg-white dark:bg-[#1F1F23] rounded-xl shadow-lg">
        <div className="text-center">
          <h2 className="mt-6 text-3xl font-bold text-gray-900 dark:text-white">Reset Password</h2>
          <p className="mt-2 text-sm text-gray-600 dark:text-gray-400">
            Reset password for <span className="font-medium">{vendor.username}</span>
          </p>
        </div>

        <form className="mt-8 space-y-6" onSubmit={handleSubmit}>
          <div className="space-y-4">
            <div className="animate-in fade-in duration-500">
              <Label htmlFor="password">New Password</Label>
              <Input
                id="password"
                name="password"
                type="password"
                autoComplete="new-password"
                required
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                className="mt-1"
                disabled={submitting}
                placeholder="Enter new password"
              />
            </div>
            <div className="animate-in fade-in duration-500 delay-150">
              <Label htmlFor="confirmPassword">Confirm Password</Label>
              <Input
                id="confirmPassword"
                name="confirmPassword"
                type="password"
                autoComplete="new-password"
                required
                value={confirmPassword}
                onChange={(e) => setConfirmPassword(e.target.value)}
                className="mt-1"
                disabled={submitting}
                placeholder="Confirm new password"
              />
            </div>
          </div>

          <Button 
            type="submit" 
            className="w-full animate-in fade-in-50 duration-500 delay-300" 
            disabled={submitting}
          >
            {submitting ? (
              <span className="flex items-center justify-center">
                <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                Resetting password...
              </span>
            ) : (
              "Reset Password"
            )}
          </Button>
        </form>

        <p className="mt-10 text-sm text-center text-gray-600 dark:text-gray-400 animate-in fade-in duration-500 delay-500">
          Remember your password?{" "}
          <Link href="/auth/login" className="text-blue-600 hover:underline dark:text-blue-400">
            Sign in
          </Link>
        </p>
      </div>
    </div>
  );
}