import React, { useState } from 'react'
import { FileDown } from 'lucide-react'
import { useFormSubmit } from '../hooks/useFormSubmit'

function validate(data) {
  const errors = {}
  if (!data.name || data.name.trim().length === 0) errors.name = 'Name ist erforderlich.'
  if (data.name && data.name.length > 100) errors.name = 'Max. 100 Zeichen.'
  if (!data.email || !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(data.email)) errors.email = 'Gültige E-Mail erforderlich.'
  if (!data.message || data.message.trim().length === 0) errors.message = 'Bitte sag kurz, wer du bist.'
  if (data.message && data.message.length > 2000) errors.message = 'Max. 2000 Zeichen.'
  return { valid: Object.keys(errors).length === 0, errors }
}

const inputStyle = (hasError) => ({
  width: '100%', padding: '12px', background: 'var(--bg-elevated)',
  border: hasError ? '1px solid #ff4444' : '1px solid var(--glass-border)',
  borderRadius: 'var(--radius-sm)', color: 'var(--text-primary)', fontSize: '1rem',
})

export default function SpeakerCvRequest() {
  const [open, setOpen] = useState(false)
  const [form, setForm] = useState({ name: '', email: '', message: '', company_website: '' })
  const { submit, loading, success, errors, serverError } = useFormSubmit('/api/speaker-cv', validate)

  function handleChange(e) {
    setForm(prev => ({ ...prev, [e.target.name]: e.target.value }))
  }

  async function handleSubmit(e) {
    e.preventDefault()
    await submit(form)
  }

  if (!open) {
    return (
      <button type="button" className="primary-button" onClick={() => setOpen(true)} style={{ display: 'inline-flex', alignItems: 'center', gap: '8px' }}>
        <FileDown size={18} /> Speaker CV anfragen
      </button>
    )
  }

  return (
    <div className="glass-panel" style={{ padding: '32px', marginTop: '8px', width: '100%' }}>
      {success ? (
        <p role="status" aria-live="polite" style={{ margin: 0, color: 'var(--text-primary)' }}>
          Danke! Der Speaker CV ist auf dem Weg in dein Postfach.
        </p>
      ) : (
        <form onSubmit={handleSubmit}>
          <p style={{ marginTop: 0, marginBottom: '20px', color: 'var(--text-secondary)' }}>
            Sag mir kurz wer Du bist und warum Du mich kennenlernen möchtest:
          </p>

          {/* Honeypot */}
          <div hidden>
            <label>
              Firmen-Website (bitte leer lassen)
              <input name="company_website" tabIndex={-1} autoComplete="off" value={form.company_website} onChange={handleChange} />
            </label>
          </div>

          <div style={{ marginBottom: '16px' }}>
            <label htmlFor="speaker-name" style={{ display: 'block', marginBottom: '6px', fontSize: '0.9rem' }}>Name</label>
            <input id="speaker-name" name="name" value={form.name} onChange={handleChange} aria-invalid={Boolean(errors.name)} aria-describedby={errors.name ? 'speaker-name-error' : undefined} style={inputStyle(errors.name)} />
            {errors.name && <p id="speaker-name-error" role="alert" style={{ color: '#ff4444', fontSize: '0.85rem', margin: '4px 0 0' }}>{errors.name}</p>}
          </div>

          <div style={{ marginBottom: '16px' }}>
            <label htmlFor="speaker-email" style={{ display: 'block', marginBottom: '6px', fontSize: '0.9rem' }}>E-Mail</label>
            <input id="speaker-email" name="email" type="email" value={form.email} onChange={handleChange} aria-invalid={Boolean(errors.email)} aria-describedby={errors.email ? 'speaker-email-error' : undefined} style={inputStyle(errors.email)} />
            {errors.email && <p id="speaker-email-error" role="alert" style={{ color: '#ff4444', fontSize: '0.85rem', margin: '4px 0 0' }}>{errors.email}</p>}
          </div>

          <div style={{ marginBottom: '20px' }}>
            <label htmlFor="speaker-message" style={{ display: 'block', marginBottom: '6px', fontSize: '0.9rem' }}>Wer bist Du & warum?</label>
            <textarea id="speaker-message" name="message" value={form.message} onChange={handleChange} rows={4} maxLength={2000} aria-invalid={Boolean(errors.message)} aria-describedby={errors.message ? 'speaker-message-error' : undefined} style={{ ...inputStyle(errors.message), resize: 'vertical' }} />
            {errors.message && <p id="speaker-message-error" role="alert" style={{ color: '#ff4444', fontSize: '0.85rem', margin: '4px 0 0' }}>{errors.message}</p>}
          </div>

          {serverError && <p role="alert" aria-live="assertive" style={{ color: '#ff4444', marginBottom: '16px' }}>{serverError}</p>}

          <div style={{ display: 'flex', gap: '12px' }}>
            <button type="submit" className="primary-button" disabled={loading}>
              {loading ? 'Wird gesendet...' : 'Speaker CV anfordern'}
            </button>
            <button type="button" className="secondary-button" onClick={() => setOpen(false)}>
              Abbrechen
            </button>
          </div>
        </form>
      )}
    </div>
  )
}