import React, { useState } from 'react';
import axios from 'axios';

const DEFAULT_ENDPOINT = 'https://formsubmit.co/ajax/jadeinfrapune@gmail.com';

export default function ContactForm() {
  const [status, setStatus] = useState({ state: 'idle', message: '' });

  async function onSubmit(e) {
    e.preventDefault();
    const form = new FormData(e.currentTarget);
    const payload = {
      name: String(form.get('name') || '').trim(),
      email: String(form.get('email') || '').trim(),
      phone: String(form.get('phone') || '').trim(),
      message: String(form.get('message') || '').trim()
    };

    if (!payload.name || !payload.email || !payload.phone || !payload.message) {
      setStatus({
        state: 'error',
        message: 'All fields are required. Please complete the form.'
      });
      return;
    }

    const namePattern = /^[A-Za-z\s]{2,60}$/;
    if (!namePattern.test(payload.name)) {
      setStatus({
        state: 'error',
        message: 'Please enter a valid name using alphabets only.'
      });
      return;
    }

    const emailPattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    if (!emailPattern.test(payload.email)) {
      setStatus({
        state: 'error',
        message: 'Please enter a valid email address.'
      });
      return;
    }

    const phonePattern = /^[0-9]{10}$/;
    if (!phonePattern.test(payload.phone)) {
      setStatus({
        state: 'error',
        message: 'Please enter a valid 10-digit phone number.'
      });
      return;
    }

    setStatus({ state: 'loading', message: '' });
    try {
      const endpoint = import.meta.env.VITE_CONTACT_ENDPOINT || DEFAULT_ENDPOINT;
      const structuredMessage = [
        'New enquiry received via jadeinfra.in contact form:',
        '',
        `Name   : ${payload.name}`,
        `Email  : ${payload.email}`,
        `Phone  : ${payload.phone}`,
        '',
        'Message:',
        payload.message
      ].join('\n');

      await axios.post(
        endpoint,
        {
          name: payload.name,
          email: payload.email,
          phone: payload.phone,
          message: payload.message,
          _subject: 'New enquiry via jadeinfra.in contact form',
          _template: 'box',
          _replyto: payload.email,
          _captcha: 'false',
          content: structuredMessage
        },
        {
          headers: { 'Content-Type': 'application/json' }
        }
      );
      setStatus({ state: 'success', message: 'Thanks! We will get back to you shortly.' });
      e.currentTarget.reset();
    } catch (err) {
      setStatus({
        state: 'error',
        message:
          'Sorry, there was an issue sending your message. Please try again or email us directly.'
      });
    }
  }

  return (
    <form className="space-y-4" onSubmit={onSubmit} noValidate aria-labelledby="contact-heading">
      <div className="grid grid-cols-1 gap-4 md:grid-cols-2">
        <div>
          <label htmlFor="name" className="block text-sm font-medium text-slate-700">Name</label>
          <input
            id="name"
            name="name"
            required
            pattern="[A-Za-z\s]{2,60}"
            autoComplete="name"
            className="mt-1 w-full rounded-md border border-slate-300 px-3 py-2
                       focus:outline-none focus:ring-2 focus:ring-brand-600"
          />
        </div>
        <div>
          <label htmlFor="email" className="block text-sm font-medium text-slate-700">Email</label>
          <input
            id="email"
            name="email"
            type="email"
            required
            pattern="^[^\s@]+@[^\s@]+\.[^\s@]+$"
            autoComplete="email"
            className="mt-1 w-full rounded-md border border-slate-300 px-3 py-2
                       focus:outline-none focus:ring-2 focus:ring-brand-600"
          />
        </div>
        <div className="md:col-span-2">
          <label htmlFor="phone" className="block text-sm font-medium text-slate-700">Phone</label>
          <input
            id="phone"
            name="phone"
            type="tel"
            required
            pattern="[0-9]{10}"
            inputMode="numeric"
            autoComplete="tel"
            className="mt-1 w-full rounded-md border border-slate-300 px-3 py-2
                       focus:outline-none focus:ring-2 focus:ring-brand-600"
          />
        </div>
        <div className="md:col-span-2">
          <label htmlFor="message" className="block text-sm font-medium text-slate-700">Message</label>
          <textarea
            id="message"
            name="message"
            required
            rows="5"
            className="mt-1 w-full rounded-md border border-slate-300 px-3 py-2
                       focus:outline-none focus:ring-2 focus:ring-brand-600"
          ></textarea>
        </div>
      </div>

      <div className="flex items-center gap-3">
        <button type="submit" className="btn btn-primary" aria-live="polite">
          Send Message
        </button>
        {status.state === 'loading' && (
          <span role="status" className="text-sm text-slate-600">Sending…</span>
        )}
        {status.state === 'success' && (
          <span className="text-sm text-green-700">{status.message}</span>
        )}
        {status.state === 'error' && (
          <span className="text-sm text-red-700">{status.message}</span>
        )}
      </div>
    </form>
  );
}