import { Helmet } from 'react-helmet-async'
import { useState } from 'react'
import { useMutation } from '@tanstack/react-query'
import { toast } from 'sonner'
import { Button } from '@/components/ui/Button'
import { Input } from '@/components/ui/Input'
import { Textarea } from '@/components/ui/Textarea'
import { Select } from '@/components/ui/Select'
import { Link } from 'react-router-dom'
import { api } from '@/lib/api'
import { useDebounce } from '@/hooks/useDebounce'

const Support = () => {
  const [formState, setFormState] = useState({
    name: '',
    company: '',
    email: '',
    phone: '',
    issue: '',
    priority: 'medium',
  })
  const [errors, setErrors] = useState({
    name: '',
    company: '',
    email: '',
    issue: '',
  })
  // Debounce validation errors so they don't flash on every keystroke
  const debouncedErrors = useDebounce(errors, 300)

  const mutation = useMutation({
    mutationFn: (data) => api.post('/support', data),
    onSuccess: () => {
      toast.success('Thanks! We\'ll get back to you soon.')
      setFormState({
        name: '',
        company: '',
        email: '',
        phone: '',
        issue: '',
        priority: 'medium',
      })
      setErrors({
        name: '',
        company: '',
        email: '',
        issue: '',
      })
    },
    onError: (error) => {
      toast.error(error.message || 'Failed to submit form. Please try again.')
    },
  })

  const validateForm = () => {
    const newErrors = {
      name: '',
      company: '',
      email: '',
      issue: '',
    }

    // Validate required fields
    if (!formState.name.trim()) newErrors.name = 'Name is required'
    if (!formState.company.trim()) newErrors.company = 'Company name is required'
    if (!formState.issue.trim()) newErrors.issue = 'Please describe your issue'

    // Validate email format
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/
    if (!formState.email.trim()) {
      newErrors.email = 'Email is required'
    } else if (!emailRegex.test(formState.email)) {
      newErrors.email = 'Please enter a valid email address'
    }

    // Validate issue minimum length (10 chars matches server-side Zod rule)
    if (formState.issue.trim().length < 10) {
      newErrors.issue = 'Issue description must be at least 10 characters'
    }

    const hasErrors = Object.values(newErrors).some(error => error !== '')
    setErrors(newErrors)

    if (hasErrors) {
      toast.error('Please fix the errors in the form')
      return false
    }

    return true
  }

  const handleSubmit = (e) => {
    e.preventDefault()
    if (!validateForm()) return
    mutation.mutate(formState)
  }

  const handleChange = (e) => {
    const { name, value } = e.target
    setFormState(prev => ({ ...prev, [name]: value }))
    // Clear error for this field as user types
    if (errors[name]) {
      setErrors(prev => ({ ...prev, [name]: '' }))
    }
  }

  return (
    <>
      <Helmet>
        <title>IT Support & Help Desk | Queue North Technologies</title>
        <meta name="description" content="Get IT support and help desk services from Queue North Technologies. 24/7 monitoring, rapid response SLAs, and dedicated support engineers for your business." />
        <meta property="og:title" content="IT Support & Help Desk | Queue North Technologies" />
        <meta property="og:description" content="24/7 IT support and help desk services. Rapid response SLAs, dedicated support engineers." />
        <meta property="og:url" content="https://queuenorth.com/support" />
        <meta property="og:type" content="website" />
        <meta property="og:image" content="https://queuenorth.com/logo.svg" />
        <meta property="og:site_name" content="Queue North Technologies" />
      </Helmet>
      {/* Page Hero */}
      <section className="bg-background py-16 md:py-24">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
          <div>
            <h1 className="text-4xl md:text-5xl font-bold text-primary-navy mb-6">Support</h1>
            <p className="text-xl text-soft-text max-w-3xl mb-8">
              Need help with your communications or infrastructure? Submit a support request and we'll get back to you promptly.
            </p>
            <div className="flex flex-wrap gap-4 mb-8">
              <div className="flex items-center gap-2 px-4 py-2 bg-primary-navy/10 rounded-lg text-primary-navy">
                <svg className="h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M3 5a2 2 0 012-2h3.28a1 1 0 01.948.684l1.498 4.493a1 1 0 01-.502 1.21l-2.257 5.13a1 1 0 01-1.31.42a2 2 0 00-2.63-.54l-2.238 5.03a2 2 0 01-2.71.319L2.663 12H4a2 2 0 012 2v2a2 2 0 01-2 2H2a2 2 0 01-2-2V5z" />
                </svg>
                <p className="text-sm font-medium">(321) 730-8020</p>
              </div>
              <div className="flex items-center gap-2 px-4 py-2 bg-primary-navy/10 rounded-lg text-primary-navy">
                <svg className="h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M3 8l7.89 5.26a2 2 0 002.22 0L21 8M5 19h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z" />
                </svg>
                <p className="text-sm font-medium">info@queuenorth.com</p>
              </div>
            </div>
            <div className="mb-8">
              <Link to="/contact" className="inline-flex items-center justify-center rounded-md text-sm font-medium h-10 px-6 bg-primary-navy text-white hover:bg-primary-navy-dark transition-colors">
                Request Consultation
              </Link>
            </div>
          </div>
        </div>
      </section>

      {/* Support Form */}
      <section className="bg-background py-16">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
          <div className="grid grid-cols-1 lg:grid-cols-2 gap-12">
            {/* Left - Info */}
            <div>
              <div className="mb-8">
                <h2 className="text-2xl font-bold text-primary-navy mb-4">Support Services</h2>
                <p className="text-soft-text mb-6">
                  We provide comprehensive support for all our services, including 24/7 monitoring, rapid response, and dedicated support engineers.
                </p>
                <div className="space-y-4">
                  <div>
                    <h3 className="font-semibold text-text mb-2">Visit Support Center</h3>
                    <a
                      href="https://queuenorth.zoho.com/"
                      target="_blank"
                      rel="noopener noreferrer"
                      className="inline-flex items-center justify-center px-4 py-2 bg-primary-navy text-white font-medium rounded-md hover:bg-primary-navy-dark transition-colors text-sm"
                    >
                      Visit Support Center
                      <svg className="ml-2 h-4 w-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M10 6H6a2 2 0 00-2 2v10a2 2 0 002 2h10a2 2 0 002-2v-4M14 4h6m0 0v6m0-6L10 14" />
                      </svg>
                    </a>
                  </div>
                  <div>
                    <h3 className="font-semibold text-text mb-2">Phone</h3>
                    <p className="text-soft-text">(321) 730-8020</p>
                  </div>
                  <div>
                    <h3 className="font-semibold text-text mb-2">Support Hours</h3>
                    <p className="text-soft-text">24/7 Monitoring with rapid response SLAs</p>
                  </div>
                  <div>
                    <h3 className="font-semibold text-text mb-2">Priority Levels</h3>
                    <p className="text-soft-text">
                      Low: General inquiries (response within 24 hours)<br/>
                      Medium: Standard issues (response within 4 hours)<br/>
                      High: Critical issues (response within 1 hour)
                    </p>
                  </div>
                </div>
              </div>

              <div className="bg-section-alt rounded-lg p-6">
                <h3 className="font-semibold text-primary-navy mb-4">What We Support</h3>
                <ul className="space-y-3">
                  {[
                    '8x8 Communications Platform',
                    'VoIP Phone Systems',
                    'Contact Center Solutions',
                    'Network Infrastructure',
                    'Cloud Migration Support',
                  ].map((item, index) => (
                    <li key={index} className="flex items-center gap-3 text-text">
                      <svg className="h-5 w-5 text-primary-navy" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M5 13l4 4L19 7" />
                      </svg>
                      {item}
                    </li>
                  ))}
                </ul>
              </div>
            </div>

            {/* Right - Form */}
            <div>
              <form onSubmit={handleSubmit} noValidate className={`space-y-6 ${mutation.isPending ? 'opacity-70 pointer-events-none' : ''}`}>
                <div>
                  <label htmlFor="name" className="block text-sm font-medium text-text mb-2">
                    Name <span className="text-red-600">*</span>
                  </label>
                  <Input
                    type="text"
                    id="name"
                    name="name"
                    value={formState.name}
                    onChange={handleChange}
                    required
                    placeholder="Your full name"
                    className={errors.name ? 'border-red-500 focus-visible:ring-red-500' : ''}
                  />
                  {debouncedErrors.name && (
                    <p className="text-xs text-red-600 mt-1">{debouncedErrors.name}</p>
                  )}
                </div>

                <div>
                  <label htmlFor="company" className="block text-sm font-medium text-text mb-2">
                    Company Name <span className="text-red-600">*</span>
                  </label>
                  <Input
                    type="text"
                    id="company"
                    name="company"
                    value={formState.company}
                    onChange={handleChange}
                    required
                    placeholder="Your company name"
                    className={errors.company ? 'border-red-500 focus-visible:ring-red-500' : ''}
                  />
                  {debouncedErrors.company && (
                    <p className="text-xs text-red-600 mt-1">{debouncedErrors.company}</p>
                  )}
                </div>

                <div>
                  <label htmlFor="email" className="block text-sm font-medium text-text mb-2">
                    Email <span className="text-red-600">*</span>
                  </label>
                  <Input
                    type="email"
                    id="email"
                    name="email"
                    value={formState.email}
                    onChange={handleChange}
                    required
                    placeholder="your.email@example.com"
                    className={errors.email ? 'border-red-500 focus-visible:ring-red-500' : ''}
                  />
                  {debouncedErrors.email && (
                    <p className="text-xs text-red-600 mt-1">{debouncedErrors.email}</p>
                  )}
                </div>

                <div>
                  <label htmlFor="phone" className="block text-sm font-medium text-text mb-2">
                    Phone (Optional)
                  </label>
                  <Input
                    type="tel"
                    id="phone"
                    name="phone"
                    value={formState.phone}
                    onChange={handleChange}
                    placeholder="(555) 123-4567"
                  />
                </div>

                <div>
                  <label htmlFor="priority" className="block text-sm font-medium text-text mb-2">
                    Priority <span className="text-red-600">*</span>
                  </label>
                  <Select
                    id="priority"
                    name="priority"
                    value={formState.priority}
                    onChange={handleChange}
                  >
                    <option value="low">Low - General inquiries (24 hours)</option>
                    <option value="medium">Medium - Standard issues (4 hours)</option>
                    <option value="high">High - Critical issues (1 hour)</option>
                  </Select>
                </div>

                <div>
                  <label htmlFor="issue" className="block text-sm font-medium text-text mb-2">
                    Describe Your Issue <span className="text-red-600">*</span>
                  </label>
                  <Textarea
                    id="issue"
                    name="issue"
                    value={formState.issue}
                    onChange={handleChange}
                    required
                    placeholder="Please describe your issue in detail..."
                    className={`w-full rounded-md border bg-background px-3 py-2 text-sm ring-offset-[#F8FAFC] placeholder:text-muted focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-navy focus-visible:ring-offset-2 disabled:cursor-not-allowed disabled:opacity-50 ${errors.issue ? 'border-red-500 focus-visible:ring-red-500' : ''}`}
                    rows={5}
                  />
                  {debouncedErrors.issue && (
                    <p className="text-xs text-red-600 mt-1">{debouncedErrors.issue}</p>
                  )}
                </div>

                <Button
                  type="submit"
                  className="w-full"
                  disabled={mutation.isPending}
                >
                  {mutation.isPending ? 'Submitting...' : 'Submit Request'}
                </Button>
              </form>
            </div>
          </div>
        </div>
      </section>
    </>
  )
}

export default Support