'use client';

import { Button } from '@/components/ui/Button';
import { Checkbox } from '@/components/ui/Checkbox';
import { Heading, Label, Text } from '@/components/ui/Typography';
import { useState } from 'react';

interface ContactFormProps {
  title?: string;
  subtitle?: string;
}

export function ContactForm({ title = 'Kontaktiraj nas', subtitle = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit.' }: ContactFormProps) {
  // Form state
  const [formData, setFormData] = useState({
    name: '',
    email: '',
    message: '',
    acceptTerms: false
  });
  
  // Validation errors
  const [errors, setErrors] = useState<Record<string, string>>({});
  
  // Form submission status
  const [isSubmitting, setIsSubmitting] = useState(false);
  const [isSubmitted, setIsSubmitted] = useState(false);
  
  // Handle input changes
  const handleChange = (e: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement>) => {
    const { name, value, type } = e.target;
    
    // Handle checkbox
    if (type === 'checkbox') {
      const checked = (e.target as HTMLInputElement).checked;
      setFormData(prev => ({ ...prev, [name]: checked }));
    } else {
      setFormData(prev => ({ ...prev, [name]: value }));
    }
    
    // Clear error when user starts typing
    if (errors[name]) {
      setErrors(prev => {
        const newErrors = { ...prev };
        delete newErrors[name];
        return newErrors;
      });
    }
  };
  
  // Handle checkbox change specifically
  const handleCheckboxChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const { name, checked } = e.target;
    setFormData(prev => ({ ...prev, [name]: checked }));
    
    // Clear error when user changes checkbox
    if (errors[name]) {
      setErrors(prev => {
        const newErrors = { ...prev };
        delete newErrors[name];
        return newErrors;
      });
    }
  };
  
  // Validate form
  const validateForm = () => {
    const newErrors: Record<string, string> = {};
    
    // Name validation
    if (!formData.name.trim()) {
      newErrors.name = 'Molimo unesite vaše ime i prezime';
    }
    
    // Email validation
    if (!formData.email.trim()) {
      newErrors.email = 'Molimo unesite vašu email adresu';
    } else if (!/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(formData.email)) {
      newErrors.email = 'Molimo unesite ispravnu email adresu';
    }
    
    // Message validation
    if (!formData.message.trim()) {
      newErrors.message = 'Molimo unesite vašu poruku';
    } else if (formData.message.trim().length < 10) {
      newErrors.message = 'Vaša poruka mora sadržavati barem 10 znakova';
    }
    
    // Terms validation
    if (!formData.acceptTerms) {
      newErrors.acceptTerms = 'Molimo prihvatite uvjete korištenja';
    }
    
    setErrors(newErrors);
    return Object.keys(newErrors).length === 0;
  };
  
  // Handle form submission
  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    
    if (validateForm()) {
      setIsSubmitting(true);
      
      // Simulate API call
      setTimeout(() => {
        setIsSubmitting(false);
        setIsSubmitted(true);
        
        // Reset form after submission
        setFormData({
          name: '',
          email: '',
          message: '',
          acceptTerms: false
        });
        
        // Hide success message after 5 seconds
        setTimeout(() => {
          setIsSubmitted(false);
        }, 5000);
      }, 1000);
    }
  };
  
  return (
    <div>
      <Heading level={2} className="mb-4">{title}</Heading>
      <Text size="lg" className="mb-8">{subtitle}</Text>
      
      {isSubmitted ? (
        <div className="p-4 bg-green-50 border border-green-200 rounded-md mb-6">
          <Text className="text-green-700 font-medium">Vaša poruka je uspješno poslana!</Text>
          <Text className="text-green-600">Hvala vam na vašem upitu. Odgovorit ćemo vam u najkraćem mogućem roku.</Text>
        </div>
      ) : null}
      
      <form className="space-y-6" onSubmit={handleSubmit}>
        <div>
          <Label htmlFor="name" className="block mb-2 text-[16px] leading-[24px]">Ime i Prezime</Label>
          <input 
            type="text" 
            id="name"
            name="name"
            value={formData.name}
            onChange={handleChange}
            className={`w-full p-3 border ${errors.name ? 'border-red-500' : 'border-gray-300'} rounded`}
          />
          {errors.name && <Text size="sm" className="mt-1 text-red-500">{errors.name}</Text>}
        </div>
        
        <div>
          <Label htmlFor="email" className="block mb-2 text-[16px] leading-[24px]">Email</Label>
          <input 
            type="email" 
            id="email"
            name="email"
            value={formData.email}
            onChange={handleChange}
            className={`w-full p-3 border ${errors.email ? 'border-red-500' : 'border-gray-300'} rounded`}
          />
          {errors.email && <Text size="sm" className="mt-1 text-red-500">{errors.email}</Text>}
        </div>
        
        <div>
          <Label htmlFor="message" className="block mb-2 text-[16px] leading-[24px]">Poruka</Label>
          <textarea 
            id="message"
            name="message"
            value={formData.message}
            onChange={handleChange}
            rows={5} 
            className={`w-full p-3 border ${errors.message ? 'border-red-500' : 'border-gray-300'} rounded`}
            placeholder="Upišite vašu poruku..."
          />
          {errors.message && <Text size="sm" className="mt-1 text-red-500">{errors.message}</Text>}
        </div>
        
        <div>
          <Checkbox 
            id="acceptTerms"
            name="acceptTerms"
            checked={formData.acceptTerms}
            onChange={handleCheckboxChange}
            label="Prihvaćam uvjete korištenja"
            className={errors.acceptTerms ? "ring-2 ring-red-500 rounded-sm" : ""}
          />
          {errors.acceptTerms && <Text size="sm" className="mt-1 text-red-500">{errors.acceptTerms}</Text>}
        </div>
        
        <Button 
          type="submit" 
          variant="primary" 
          className="px-8 py-3 bg-black text-white"
          disabled={isSubmitting}
        >
          {isSubmitting ? 'Slanje...' : 'Pošalji'}
        </Button>
      </form>
    </div>
  );
}