"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
import { createClient } from "@/lib/supabase/client";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { toast } from "@/components/ui/use-toast";
import { Compass } from "lucide-react";

export default function SetupUsernamePage() {
  const [username, setUsername] = useState("");
  const [isLoading, setIsLoading] = useState(false);
  const router = useRouter();
  const supabase = createClient();

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    setIsLoading(true);

    try {
      const { data: existingUser } = await supabase
        .from("users")
        .select("username")
        .eq("username", username)
        .single();

      if (existingUser) {
        toast({
          title: "Username taken",
          description: "This username is already taken. Please choose another one.",
          variant: "destructive",
        });
        return;
      }

      const { error } = await supabase
        .from("users")
        .update({ username })
        .eq("id", (await supabase.auth.getUser()).data.user?.id);

      if (error) throw error;

      toast({
        title: "Username set!",
        description: "Your username has been successfully set.",
      });

      router.push("/");
    } catch (error) {
      toast({
        title: "Error",
        description: "There was an error setting your username. Please try again.",
        variant: "destructive",
      });
    } finally {
      setIsLoading(false);
    }
  }

  return (
    <div className="flex min-h-screen flex-col items-center justify-center bg-gradient-to-b from-background to-muted p-4">
      <div className="w-full max-w-md space-y-8 rounded-2xl border bg-card p-8 shadow-lg">
        <div className="text-center">
          <div className="mx-auto mb-4 flex size-16 items-center justify-center rounded-full bg-primary/10">
            <Compass className="size-8 text-primary" />
          </div>
          <h1 className="text-3xl font-bold tracking-tight">Choose Your Explorer Name</h1>
          <p className="mt-2 text-muted-foreground">
            Pick a unique name for your adventures
          </p>
        </div>
        <form onSubmit={handleSubmit} className="space-y-6">
          <div>
            <Input
              type="text"
              placeholder="explorer_name"
              value={username}
              onChange={(e) => setUsername(e.target.value)}
              required
              minLength={3}
              maxLength={20}
              pattern="[a-zA-Z0-9_-]+"
              title="Username can only contain letters, numbers, underscores, and hyphens"
              className="h-12 text-center text-lg"
            />
          </div>
          <Button type="submit" className="w-full" size="lg" disabled={isLoading}>
            {isLoading ? "Setting up..." : "Start Exploring"}
          </Button>
        </form>
      </div>
    </div>
  );
}