'use client'

import { useState } from 'react'
import Script from 'next/script'
import { cn } from '@/lib/utils'
import { RichTextRenderer } from './RichTextRenderer'
import type { FAQBlock as FAQBlockType, FAQ } from '@/lib/types'

type FAQBlockProps = Omit<FAQBlockType, 'blockType'> & {
  faqs?: FAQ[]
}

export function FAQBlock({
  title,
  subtitle,
  displayMode,
  selectedFaqs,
  filterCategory,
  layout = 'accordion',
  expandFirst = false,
  showSchema = true,
  faqs: externalFaqs,
}: FAQBlockProps) {
  // Use selectedFaqs if displayMode is 'selected', otherwise use externalFaqs
  const items = displayMode === 'selected' ? selectedFaqs : externalFaqs

  if (!items || items.length === 0) return null

  // Generate JSON-LD schema data
  const schemaData = showSchema
    ? {
        '@context': 'https://schema.org',
        '@type': 'FAQPage',
        mainEntity: items.map((faq) => ({
          '@type': 'Question',
          name: faq.question,
          acceptedAnswer: {
            '@type': 'Answer',
            text: extractTextFromRichText(faq.answer),
          },
        })),
      }
    : null

  return (
    <section className="py-16 md:py-20">
      <div className="container">
        {/* Section Header */}
        {(title || subtitle) && (
          <div className="text-center max-w-2xl mx-auto mb-12">
            {title && <h2 className="mb-4">{title}</h2>}
            {subtitle && (
              <p className="text-lg text-espresso/80">{subtitle}</p>
            )}
          </div>
        )}

        {/* FAQ Items */}
        <div className="max-w-3xl mx-auto">
          {layout === 'accordion' ? (
            <AccordionFAQ items={items} expandFirst={expandFirst} />
          ) : layout === 'grid' ? (
            <GridFAQ items={items} />
          ) : (
            <ListFAQ items={items} />
          )}
        </div>

        {/* JSON-LD Schema using Next.js Script component for safety */}
        {schemaData && (
          <Script
            id="faq-schema"
            type="application/ld+json"
            strategy="afterInteractive"
          >
            {JSON.stringify(schemaData)}
          </Script>
        )}
      </div>
    </section>
  )
}

function AccordionFAQ({
  items,
  expandFirst,
}: {
  items: FAQ[]
  expandFirst: boolean
}) {
  const [openIndex, setOpenIndex] = useState<number | null>(
    expandFirst ? 0 : null
  )

  return (
    <div className="space-y-4">
      {items.map((faq, index) => (
        <div
          key={faq.id}
          className="border border-warm-gray rounded-xl overflow-hidden"
        >
          <button
            type="button"
            className="w-full px-6 py-4 flex items-center justify-between text-left bg-soft-white hover:bg-ivory transition-colors focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-brass focus-visible:ring-inset"
            onClick={() => setOpenIndex(openIndex === index ? null : index)}
            aria-expanded={openIndex === index}
          >
            <span className="font-headline text-lg font-medium text-espresso pr-4">
              {faq.question}
            </span>
            <svg
              xmlns="http://www.w3.org/2000/svg"
              fill="none"
              viewBox="0 0 24 24"
              strokeWidth={2}
              stroke="currentColor"
              className={cn(
                'w-5 h-5 text-brass transition-transform duration-200 flex-shrink-0',
                openIndex === index && 'rotate-180'
              )}
            >
              <path
                strokeLinecap="round"
                strokeLinejoin="round"
                d="M19.5 8.25l-7.5 7.5-7.5-7.5"
              />
            </svg>
          </button>

          <div
            className={cn(
              'grid transition-all duration-300 ease-out',
              openIndex === index
                ? 'grid-rows-[1fr] opacity-100'
                : 'grid-rows-[0fr] opacity-0'
            )}
          >
            <div className="overflow-hidden">
              <div className="px-6 pb-6 pt-2">
                <RichTextRenderer content={faq.answer} />
              </div>
            </div>
          </div>
        </div>
      ))}
    </div>
  )
}

function ListFAQ({ items }: { items: FAQ[] }) {
  return (
    <div className="space-y-8">
      {items.map((faq) => (
        <div key={faq.id}>
          <h3 className="text-xl font-semibold mb-3">{faq.question}</h3>
          <RichTextRenderer content={faq.answer} />
        </div>
      ))}
    </div>
  )
}

function GridFAQ({ items }: { items: FAQ[] }) {
  return (
    <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
      {items.map((faq) => (
        <div
          key={faq.id}
          className="bg-soft-white border border-warm-gray rounded-xl p-6"
        >
          <h3 className="text-lg font-semibold mb-3">{faq.question}</h3>
          <RichTextRenderer content={faq.answer} />
        </div>
      ))}
    </div>
  )
}

// Helper to extract plain text from RichText for schema
function extractTextFromRichText(richText: FAQ['answer']): string {
  if (!richText?.root?.children) return ''

  function extractFromNode(node: Record<string, unknown>): string {
    if (node.text) return node.text as string

    const children = node.children as Record<string, unknown>[] | undefined
    if (children) {
      return children.map(extractFromNode).join('')
    }

    return ''
  }

  return richText.root.children
    .map((node) => extractFromNode(node as Record<string, unknown>))
    .join(' ')
    .trim()
}