"use client";

import { useState, useEffect, useCallback } from "react";
import { createPortal } from "react-dom";
import { X, Instagram, Send, CheckCircle } from "lucide-react";

interface MasterClassSignupModalProps {
  open: boolean;
  onClose: () => void;
  masterClassTitle: string;
  successMessage?: string;
}

export function MasterClassSignupModal({
  open,
  onClose,
  masterClassTitle,
  successMessage,
}: MasterClassSignupModalProps) {
  const [name, setName] = useState("");
  const [instagram, setInstagram] = useState("");
  const [telegram, setTelegram] = useState("");
  const [submitting, setSubmitting] = useState(false);
  const [submitted, setSubmitted] = useState(false);
  const [error, setError] = useState("");

  // Close on Escape
  useEffect(() => {
    if (!open) return;
    function onKey(e: KeyboardEvent) {
      if (e.key === "Escape") onClose();
    }
    document.addEventListener("keydown", onKey);
    return () => document.removeEventListener("keydown", onKey);
  }, [open, onClose]);

  // Lock body scroll
  useEffect(() => {
    if (open) {
      document.body.style.overflow = "hidden";
    } else {
      document.body.style.overflow = "";
    }
    return () => {
      document.body.style.overflow = "";
    };
  }, [open]);

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

      try {
        const res = await fetch("/api/master-class-register", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({
            masterClassTitle,
            name: name.trim(),
            instagram: `@${instagram.trim()}`,
            telegram: telegram.trim() ? `@${telegram.trim()}` : undefined,
          }),
        });

        if (!res.ok) {
          const data = await res.json();
          throw new Error(data.error || "Ошибка регистрации");
        }

        setSubmitted(true);
      } catch (err) {
        setError(err instanceof Error ? err.message : "Ошибка регистрации");
      } finally {
        setSubmitting(false);
      }
    },
    [masterClassTitle, name, instagram, telegram]
  );

  const handleClose = useCallback(() => {
    onClose();
    setTimeout(() => {
      setName("");
      setInstagram("");
      setTelegram("");
      setSubmitted(false);
      setError("");
    }, 300);
  }, [onClose]);

  if (!open) return null;

  return createPortal(
    <div
      className="modal-overlay fixed inset-0 z-50 flex items-center justify-center p-4"
      onClick={handleClose}
    >
      <div className="absolute inset-0 bg-black/70 backdrop-blur-sm" />

      <div
        className="modal-content relative w-full max-w-md rounded-2xl border border-white/[0.08] bg-[#0a0a0a] p-6 sm:p-8 shadow-2xl"
        onClick={(e) => e.stopPropagation()}
      >
        <button
          onClick={handleClose}
          className="absolute right-4 top-4 flex h-8 w-8 items-center justify-center rounded-full text-neutral-500 transition-colors hover:bg-white/[0.06] hover:text-white cursor-pointer"
        >
          <X size={18} />
        </button>

        {submitted ? (
          <div className="py-4 text-center">
            <div className="mx-auto mb-4 flex h-14 w-14 items-center justify-center rounded-full bg-emerald-500/10">
              <CheckCircle size={28} className="text-emerald-500" />
            </div>
            <h3 className="text-lg font-bold text-white">Отлично!</h3>
            <p className="mt-2 text-sm text-neutral-400">
              {successMessage || "Вы записаны! Мы свяжемся с вами"}
            </p>
            <button
              onClick={handleClose}
              className="mt-6 rounded-full bg-gold px-6 py-2.5 text-sm font-semibold text-black transition-all hover:bg-gold-light cursor-pointer"
            >
              Закрыть
            </button>
          </div>
        ) : (
          <>
            <div className="mb-6">
              <h3 className="text-xl font-bold text-white">Записаться</h3>
              <p className="mt-1 text-sm text-neutral-400">{masterClassTitle}</p>
            </div>

            <form onSubmit={handleSubmit} className="space-y-3">
              <div>
                <input
                  type="text"
                  value={name}
                  onChange={(e) => setName(e.target.value)}
                  placeholder="Ваше имя"
                  required
                  className="w-full rounded-xl border border-white/[0.08] bg-white/[0.04] px-4 py-3 text-sm text-white placeholder-neutral-500 outline-none transition-colors focus:border-gold/40 focus:bg-white/[0.06]"
                />
              </div>

              <div className="flex items-center gap-0 rounded-xl border border-white/[0.08] bg-white/[0.04] transition-colors focus-within:border-gold/40 focus-within:bg-white/[0.06]">
                <span className="flex items-center gap-1.5 pl-4 text-sm text-neutral-500 select-none">
                  <Instagram size={14} className="text-pink-400" />
                  @
                </span>
                <input
                  type="text"
                  value={instagram}
                  onChange={(e) => setInstagram(e.target.value.replace(/^@/, ""))}
                  placeholder="username"
                  required
                  className="flex-1 bg-transparent px-2 py-3 text-sm text-white placeholder-neutral-500 outline-none"
                />
              </div>

              <div className="flex items-center gap-0 rounded-xl border border-white/[0.08] bg-white/[0.04] transition-colors focus-within:border-gold/40 focus-within:bg-white/[0.06]">
                <span className="flex items-center gap-1.5 pl-4 text-sm text-neutral-500 select-none">
                  <Send size={14} className="text-blue-400" />
                  @
                </span>
                <input
                  type="text"
                  value={telegram}
                  onChange={(e) => setTelegram(e.target.value.replace(/^@/, ""))}
                  placeholder="username (необязательно)"
                  className="flex-1 bg-transparent px-2 py-3 text-sm text-white placeholder-neutral-500 outline-none"
                />
              </div>

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

              <button
                type="submit"
                disabled={submitting}
                className="flex w-full items-center justify-center gap-2 rounded-xl bg-gold py-3 text-sm font-semibold text-black transition-all hover:bg-gold-light hover:shadow-lg hover:shadow-gold/20 cursor-pointer disabled:opacity-50"
              >
                {submitting ? "Отправка..." : "Записаться"}
              </button>
            </form>
          </>
        )}
      </div>
    </div>,
    document.body
  );
}