"use client";

import { useState, useEffect, useCallback } from "react";
import { createPortal } from "react-dom";
import { X, Instagram, Send, CheckCircle, Phone } from "lucide-react";
import { BRAND } from "@/lib/constants";

interface BookingModalProps {
  open: boolean;
  onClose: () => void;
  groupInfo?: string;
  contact?: { instagram: string; phone: string };
}

const DEFAULT_CONTACT = {
  instagram: BRAND.instagram,
  phone: "+375 29 389-70-01",
};

export function BookingModal({ open, onClose, groupInfo, contact: contactProp }: BookingModalProps) {
  const contact = contactProp ?? DEFAULT_CONTACT;
  const [name, setName] = useState("");
  const [phone, setPhone] = useState("+375 ");

  // Format phone: +375 (XX) XXX-XX-XX
  function handlePhoneChange(raw: string) {
    // Strip everything except digits
    let digits = raw.replace(/\D/g, "");
    // Ensure starts with 375
    if (!digits.startsWith("375")) {
      digits = "375" + digits.replace(/^375?/, "");
    }
    // Limit to 12 digits (375 + 9 digits)
    digits = digits.slice(0, 12);

    // Format
    let formatted = "+375";
    const rest = digits.slice(3);
    if (rest.length > 0) formatted += " (" + rest.slice(0, 2);
    if (rest.length >= 2) formatted += ") ";
    if (rest.length > 2) formatted += rest.slice(2, 5);
    if (rest.length > 5) formatted += "-" + rest.slice(5, 7);
    if (rest.length > 7) formatted += "-" + rest.slice(7, 9);

    setPhone(formatted);
  }
  const [submitted, setSubmitted] = useState(false);

  // 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(
    (e: React.FormEvent) => {
      e.preventDefault();
      // Build Instagram DM message with pre-filled text
      const groupText = groupInfo ? ` (${groupInfo})` : "";
      const message = `Здравствуйте! Меня зовут ${name}, хочу записаться на занятие${groupText}. Мой телефон: ${phone}`;
      const instagramUrl = `https://ig.me/m/blackheartdancehouse?text=${encodeURIComponent(message)}`;
      window.open(instagramUrl, "_blank");
      setSubmitted(true);
    },
    [name, phone, groupInfo, contact]
  );

  const handleClose = useCallback(() => {
    onClose();
    // Reset after animation
    setTimeout(() => {
      setName("");
      setPhone("+375 ");
      setSubmitted(false);
    }, 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}
    >
      {/* Backdrop */}
      <div className="absolute inset-0 bg-black/70 backdrop-blur-sm" />

      {/* Modal */}
      <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()}
      >
        {/* Close button */}
        <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 ? (
          /* Success state */
          <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">
              Сообщение отправлено в Instagram. Мы свяжемся с вами в ближайшее время!
            </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>
        ) : (
          <>
            {/* Header */}
            <div className="mb-6">
              <h3 className="text-xl font-bold text-white">Записаться</h3>
              <p className="mt-1 text-sm text-neutral-400">
                Оставьте данные и мы свяжемся с вами, или напишите нам напрямую
              </p>
            </div>

            {/* Form */}
            <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>
                <input
                  type="tel"
                  value={phone}
                  onChange={(e) => handlePhoneChange(e.target.value)}
                  placeholder="+375 (__) ___-__-__"
                  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>

              <button
                type="submit"
                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"
              >
                <Send size={15} />
                Отправить в Instagram
              </button>
            </form>

            {/* Divider */}
            <div className="my-5 flex items-center gap-3">
              <span className="h-px flex-1 bg-white/[0.06]" />
              <span className="text-xs text-neutral-500">или напрямую</span>
              <span className="h-px flex-1 bg-white/[0.06]" />
            </div>

            {/* Direct links */}
            <div className="flex gap-2">
              <a
                href={contact.instagram}
                target="_blank"
                rel="noopener noreferrer"
                className="flex flex-1 items-center justify-center gap-2 rounded-xl border border-white/[0.08] bg-white/[0.03] py-3 text-sm font-medium text-neutral-300 transition-all hover:border-gold/30 hover:text-gold-light cursor-pointer"
              >
                <Instagram size={16} />
                Instagram
              </a>
              <a
                href={`tel:${contact.phone.replace(/\s/g, "")}`}
                className="flex flex-1 items-center justify-center gap-2 rounded-xl border border-white/[0.08] bg-white/[0.03] py-3 text-sm font-medium text-neutral-300 transition-all hover:border-gold/30 hover:text-gold-light cursor-pointer"
              >
                <Phone size={16} />
                Позвонить
              </a>
            </div>
          </>
        )}
      </div>
    </div>,
    document.body
  );
}