import React, { useState } from "react";
import emailjs from "@emailjs/browser";
import { ToastContainer, toast } from "react-toastify";
import "react-toastify/dist/ReactToastify.css";
import { useTranslation } from "react-i18next";
import { motion, useReducedMotion } from "framer-motion";
import PhoneCodeSelect from "./PhoneCodeSelect";

const PHONE_PATTERNS: Record<string, string> = {
  "+351": "### ### ###",
  "+34": "### ### ###",
  "+33": "# ## ## ## ##",
  "+44": "#### ######",
  "+1": "(###) ###-####",
  "+55": "(##) #####-####",
};

const digitsOnly = (value: string) => value.replace(/\D/g, "");

const maxDigitsFor = (pattern: string) =>
  pattern.split("").filter((c) => c === "#").length;

const formatPhoneNumber = (digits: string, pattern: string) => {
  let result = "";
  let digitIndex = 0;
  for (let i = 0; i < pattern.length && digitIndex < digits.length; i++) {
    const ch = pattern[i];
    if (ch === "#") {
      result += digits[digitIndex];
      digitIndex++;
    } else {
      result += ch;
    }
  }
  return result;
};

const ContactForm = () => {
  const { t } = useTranslation();
  const prefersReducedMotion = useReducedMotion();
  const [countryCode, setCountryCode] = useState("+351");
  const [phoneDigits, setPhoneDigits] = useState("");

  const activePattern = PHONE_PATTERNS[countryCode];
  const formattedPhone = formatPhoneNumber(phoneDigits, activePattern);

  const handleCountryChange = (code: string) => {
    setCountryCode(code);
    setPhoneDigits((prev) =>
      prev.slice(0, maxDigitsFor(PHONE_PATTERNS[code]))
    );
  };

  const handlePhoneChange = (raw: string) => {
    const digits = digitsOnly(raw).slice(0, maxDigitsFor(activePattern));
    setPhoneDigits(digits);
  };

  const notify = () => {
    toast.success(t("contact.toasts.success"));
  };

  const errorToast = () => {
    toast.error(t("contact.toasts.error"));
  };

  const emptyForm = () => {
    toast.warning(t("contact.toasts.empty"));
  };

  const sendEmail = (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault();

    const isEmpty = Array.from(e.currentTarget.elements).some((el) => {
      if (el.tagName !== "INPUT" && el.tagName !== "TEXTAREA") return false;
      const field = el as HTMLInputElement | HTMLTextAreaElement;
      if (field.type === "hidden") return false;
      return field.value.trim() === "";
    });

    if (isEmpty) {
      emptyForm();
      return;
    }

    emailjs
      .sendForm("service_o7kxotj", "template_f30zlog", e.currentTarget, {
        publicKey: "vcSOwPedqkRH3nmr9",
      })
      .then(
        (result) => {
          console.log(result.text);
          notify();
        },
        (error) => {
          console.log(error.text);
          errorToast();
        }
      );

    e.currentTarget.reset();
    setPhoneDigits("");
    setCountryCode("+351");
  };

  return (
    <div className="mt-10 mx-5 mb-10 lg:mx-0 flex justify-center items-center">
      <motion.form
        onSubmit={sendEmail}
        className="w-full md:w-[42rem] rounded-3xl glass-panel shadow-glass-lg p-6 md:p-10"
        initial={prefersReducedMotion ? { opacity: 0 } : { opacity: 0, y: 24 }}
        whileInView={
          prefersReducedMotion ? { opacity: 1 } : { opacity: 1, y: 0 }
        }
        viewport={{ once: true, margin: "-80px" }}
        transition={{ type: "spring", damping: 22, stiffness: 140 }}
      >
        <div className="flex flex-col md:flex-row md:gap-3">
          <input
            className="form-input flex-1"
            type="text"
            name="user_name"
            placeholder={t("contact.form.name")}
          />
          <input
            className="form-input flex-1"
            type="email"
            name="user_email"
            placeholder={t("contact.form.email")}
          />
        </div>
        <div className="flex flex-col md:flex-row md:gap-3">
          <input
            className="form-input flex-1"
            type="text"
            name="user_company"
            placeholder={t("contact.form.company")}
          />
          <div className="phone-input-group flex-1 flex items-center">
            <PhoneCodeSelect value={countryCode} onChange={handleCountryChange} />
            <span className="h-5 w-px bg-white/10 mx-2" aria-hidden="true" />
            <input
              className="phone-number-input"
              type="tel"
              inputMode="numeric"
              name="user_phone"
              value={formattedPhone}
              onChange={(e) => handlePhoneChange(e.target.value)}
              placeholder={t("contact.form.phone")}
            />
          </div>
        </div>
        <div className="flex flex-col">
          <input
            className="form-input"
            type="text"
            name="user_question"
            placeholder={t("contact.form.question")}
          ></input>

          <textarea
            className="form-input resize-none"
            name="message"
            placeholder={t("contact.form.message")}
            rows={5}
          ></textarea>
        </div>

        <div className="flex mt-6 rounded-xl bg-gradient-to-br from-gold-light to-gold-mid p-0.5 shadow-gold-glow">
          <motion.button
            type="submit"
            className="flex-1 font-semibold px-8 py-3 text-xl md:text-2xl bg-custom-bgdark text-white rounded-[0.65rem] hover:bg-transparent transition-colors duration-300"
            whileTap={{ scale: 0.97 }}
            transition={{ type: "spring", stiffness: 500, damping: 30 }}
          >
            {t("contact.form.button")}
          </motion.button>
        </div>

        <ToastContainer
          position="top-center"
          autoClose={5000}
          hideProgressBar
          newestOnTop={false}
          closeOnClick
          rtl={false}
          pauseOnFocusLoss
          draggable
          pauseOnHover
          theme="dark"
        />
      </motion.form>
    </div>
  );
};

export default ContactForm;