import type { Dispatch, FormEvent, SetStateAction } from 'react';
import Card from '@/components/ui/Card';
import Button from '@/components/ui/Button';
import clsx from 'clsx';
import {
  BanknotesIcon,
  CheckCircleIcon,
  EnvelopeIcon,
  LinkIcon,
  StarIcon,
  XMarkIcon,
} from '@heroicons/react/24/outline';
import type { AddTicketType, AddTicketFormState } from '../_types';

interface AddTicketModalProps {
  open: boolean;
  onClose: () => void;
  form: AddTicketFormState;
  setForm: Dispatch<SetStateAction<AddTicketFormState>>;
  onSubmit: (e: FormEvent) => void;
  submitting: boolean;
  eventPriceLabel: string;
}

const TYPE_OPTIONS: { value: AddTicketType; label: string }[] = [
  { value: 'paid', label: 'Paid' },
  { value: 'door', label: 'At Door' },
  { value: 'unpaid', label: 'Unpaid' },
  { value: 'guest', label: 'Guest' },
];

const SUBMIT_LABELS: Record<AddTicketType, string> = {
  paid: 'Create & send ticket',
  door: 'Record door payment',
  unpaid: 'Create & send pay link',
  guest: 'Invite guest',
};

const SUBMIT_ICONS: Record<AddTicketType, typeof EnvelopeIcon> = {
  paid: EnvelopeIcon,
  door: BanknotesIcon,
  unpaid: LinkIcon,
  guest: StarIcon,
};

// Live "what happens" preview lines for the selected type / email / check-in combo
function previewLines(form: AddTicketFormState, eventPriceLabel: string): string[] {
  const hasEmail = !!form.email.trim();
  const lines: string[] = [];
  if (form.type === 'paid') {
    lines.push(`Payment of ${eventPriceLabel} recorded as paid — counts toward revenue`);
    lines.push('Confirmation email with QR ticket sent');
  } else if (form.type === 'door') {
    lines.push(`Cash payment of ${eventPriceLabel} recorded as paid at the door — counts toward revenue`);
    lines.push('QR code issued');
    if (!form.firstName.trim()) {
      lines.push('No name — the ticket is logged as a "Walk-in"');
    }
    lines.push(hasEmail
      ? 'Confirmation email with QR ticket sent'
      : 'No email — nothing is sent, walk-in kept on the list only');
  } else if (form.type === 'unpaid') {
    lines.push(`Ticket marked unpaid — balance of ${eventPriceLabel} to collect at the door`);
    lines.push('QR code issued, flagged "unpaid" for door staff');
    lines.push(hasEmail
      ? 'Bancard (TPago) payment link emailed to the attendee'
      : 'No email — no pay link sent, payment collected at the door');
  } else {
    lines.push('Free guest ticket (comp) — not counted in revenue');
    lines.push('Auto-confirmed with QR code');
    lines.push(hasEmail ? 'Confirmation email sent' : 'No email — nothing is sent');
  }
  if (form.checkinNow) {
    lines.push('Checked in immediately');
  }
  return lines;
}

const PREVIEW_STYLES: Record<AddTicketType, { box: string; icon: string; text: string }> = {
  paid: { box: 'bg-blue-50 border-blue-200', icon: 'text-blue-500', text: 'text-blue-800' },
  door: { box: 'bg-emerald-50 border-emerald-200', icon: 'text-emerald-500', text: 'text-emerald-800' },
  unpaid: { box: 'bg-orange-50 border-orange-200', icon: 'text-orange-500', text: 'text-orange-800' },
  guest: { box: 'bg-amber-50 border-amber-200', icon: 'text-amber-500', text: 'text-amber-800' },
};

const PREVIEW_ICONS: Record<AddTicketType, typeof EnvelopeIcon> = {
  paid: CheckCircleIcon,
  door: BanknotesIcon,
  unpaid: BanknotesIcon,
  guest: StarIcon,
};

export function AddTicketModal({
  open,
  onClose,
  form,
  setForm,
  onSubmit,
  submitting,
  eventPriceLabel,
}: AddTicketModalProps) {
  if (!open) return null;

  const emailRequired = form.type === 'paid';
  // Door walk-ins can be logged with nothing filled in
  const nameRequired = form.type !== 'door';
  const style = PREVIEW_STYLES[form.type];
  const PreviewIcon = PREVIEW_ICONS[form.type];
  const SubmitIcon = SUBMIT_ICONS[form.type];

  return (
    <div
      className="fixed inset-0 bg-black/50 z-50 flex items-end md:items-center justify-center p-0 md:p-4"
      onClick={onClose}
      role="presentation"
    >
      <Card
        className="w-full md:max-w-md max-h-[90vh] flex flex-col overflow-hidden rounded-t-2xl md:rounded-card"
        onClick={(e) => e.stopPropagation()}
      >
        <div className="flex items-center justify-between p-4 border-b border-secondary-light-gray flex-shrink-0">
          <h2 className="text-base font-bold">Add Ticket</h2>
          <button
            onClick={onClose}
            className="p-2 hover:bg-gray-100 rounded-btn min-h-[44px] min-w-[44px] flex items-center justify-center"
          >
            <XMarkIcon className="w-5 h-5" />
          </button>
        </div>
        <form onSubmit={onSubmit} className="p-4 space-y-3 overflow-y-auto flex-1 min-h-0">
          {/* Segmented ticket-type control */}
          <div className="flex rounded-btn bg-gray-100 p-1">
            {TYPE_OPTIONS.map((option) => (
              <button
                key={option.value}
                type="button"
                onClick={() => setForm((f) => ({ ...f, type: option.value }))}
                className={clsx(
                  'flex-1 px-2 py-2 text-xs sm:text-sm font-medium rounded-btn min-h-[36px] whitespace-nowrap transition-colors',
                  form.type === option.value
                    ? 'bg-white shadow-sm text-primary-dark'
                    : 'text-gray-500 hover:text-gray-700'
                )}
              >
                {option.label}
              </button>
            ))}
          </div>

          <div className="grid grid-cols-2 gap-3">
            <div>
              <label className="block text-xs font-medium mb-1">First Name {nameRequired && '*'}</label>
              <input type="text" required={nameRequired} value={form.firstName}
                onChange={(e) => setForm((f) => ({ ...f, firstName: e.target.value }))}
                className="w-full px-3 py-2.5 text-sm rounded-btn border border-secondary-light-gray focus:outline-none focus:ring-2 focus:ring-primary-yellow"
                placeholder={nameRequired ? 'First name' : 'First name (optional)'} />
            </div>
            <div>
              <label className="block text-xs font-medium mb-1">Last Name</label>
              <input type="text" value={form.lastName}
                onChange={(e) => setForm((f) => ({ ...f, lastName: e.target.value }))}
                className="w-full px-3 py-2.5 text-sm rounded-btn border border-secondary-light-gray focus:outline-none focus:ring-2 focus:ring-primary-yellow"
                placeholder="Last name" />
            </div>
          </div>
          <div>
            <label className="block text-xs font-medium mb-1">Email {emailRequired && '*'}</label>
            <input type="email" required={emailRequired} value={form.email}
              onChange={(e) => setForm((f) => ({ ...f, email: e.target.value }))}
              className="w-full px-3 py-2.5 text-sm rounded-btn border border-secondary-light-gray focus:outline-none focus:ring-2 focus:ring-primary-yellow"
              placeholder={emailRequired ? 'email@example.com' : 'email@example.com (optional)'} />
            <p className="text-[10px] text-gray-500 mt-1">
              {form.type === 'paid' && 'Ticket will be sent to this email'}
              {form.type === 'door' && 'Optional — if provided, the ticket confirmation is sent here'}
              {form.type === 'unpaid' && 'If provided, the payment link is sent here'}
              {form.type === 'guest' && 'If provided, a confirmation email will be sent'}
            </p>
          </div>
          <div>
            <label className="block text-xs font-medium mb-1">Phone</label>
            <input type="tel" value={form.phone}
              onChange={(e) => setForm((f) => ({ ...f, phone: e.target.value }))}
              className="w-full px-3 py-2.5 text-sm rounded-btn border border-secondary-light-gray focus:outline-none focus:ring-2 focus:ring-primary-yellow"
              placeholder="+595 981 123456" />
          </div>
          <div>
            <label className="block text-xs font-medium mb-1">Admin Note</label>
            <textarea value={form.adminNote}
              onChange={(e) => setForm((f) => ({ ...f, adminNote: e.target.value }))}
              className="w-full px-3 py-2.5 text-sm rounded-btn border border-secondary-light-gray focus:outline-none focus:ring-2 focus:ring-primary-yellow"
              rows={2} placeholder="Internal note..." />
          </div>
          <div className="flex items-center gap-3">
            <input type="checkbox" id="checkinNow" checked={form.checkinNow}
              onChange={(e) => setForm((f) => ({ ...f, checkinNow: e.target.checked }))}
              className="w-4 h-4 rounded border-secondary-light-gray text-primary-yellow focus:ring-primary-yellow" />
            <label htmlFor="checkinNow" className="text-sm font-medium">Check in now</label>
          </div>

          {/* Live preview of what this submission does */}
          <div className={clsx('border rounded-lg p-3', style.box)}>
            <div className="flex items-start gap-2">
              <PreviewIcon className={clsx('w-4 h-4 mt-0.5 flex-shrink-0', style.icon)} />
              <div className={clsx('text-xs', style.text)}>
                <p className="font-medium">What happens:</p>
                <ul className="list-disc ml-4 mt-0.5 space-y-0.5">
                  {previewLines(form, eventPriceLabel).map((line) => (
                    <li key={line}>{line}</li>
                  ))}
                </ul>
              </div>
            </div>
          </div>

          <div className="flex gap-3 pt-2">
            <Button type="button" variant="outline" onClick={onClose} className="flex-1 min-h-[44px]">Cancel</Button>
            <Button type="submit" isLoading={submitting} className="flex-1 min-h-[44px]">
              <SubmitIcon className="w-4 h-4 mr-1.5" />
              {SUBMIT_LABELS[form.type]}
            </Button>
          </div>
        </form>
      </Card>
    </div>
  );
}