import Image from 'next/image'
import Link from 'next/link'
import { notFound } from 'next/navigation'
import { getPayload } from 'payload'
import React from 'react'

import config from '@/payload.config'
import type { Media, Product } from '@/payload-types'
import { cestaKSouboru, formatujCenu, popisStavu } from '@/lib/format'
import '../../styles.css'

export const dynamic = 'force-dynamic'

type Props = { params: Promise<{ slug: string }> }

export async function generateMetadata({ params }: Props) {
  const polozka = await najdiPolozku((await params).slug)
  if (!polozka) return { title: 'Položka nenalezena' }

  return {
    title: `${polozka.nazev} — Reiner zbraně`,
    description: polozka.popis ?? undefined,
  }
}

export default async function DetailPolozky({ params }: Props) {
  const polozka = await najdiPolozku((await params).slug)
  if (!polozka) notFound()

  const obrazky = (polozka.obrazky ?? [])
    .map((radek) => radek.obrazek)
    .filter((o): o is Media => typeof o === 'object' && o !== null)

  return (
    <article className="stranka detail">
      <p className="zpet">
        {typeof polozka.kategorie === 'object' && polozka.kategorie !== null ? (
          <Link href={`/kategorie/${polozka.kategorie.slug}`}>
            ← Zpět na {polozka.kategorie.nazev}
          </Link>
        ) : (
          <Link href="/">← Zpět na nabídku</Link>
        )}
      </p>

      <h1>{polozka.nazev}</h1>

      <p className="detail__cena">
        {formatujCenu(polozka.cena)}
        <span className={`znacka-stavu znacka-stavu--${polozka.stav}`}>
          {popisStavu(polozka.stav)}
        </span>
      </p>

      {obrazky.length > 0 && (
        <div className="galerie">
          {obrazky.map((obrazek) => {
            const varianta = obrazek.sizes?.detail
            const url = varianta?.url ?? obrazek.url
            const width = varianta?.width ?? obrazek.width
            const height = varianta?.height ?? obrazek.height
            if (!url || !width || !height) return null

            return (
              <Image
                key={obrazek.id}
                alt={obrazek.alt ?? polozka.nazev}
                src={cestaKSouboru(url)}
                width={width}
                height={height}
                sizes="(max-width: 900px) 100vw, 800px"
              />
            )
          })}
        </div>
      )}

      {polozka.parametry && polozka.parametry.length > 0 && (
        <table className="parametry">
          <tbody>
            {polozka.parametry.map((parametr) => (
              <tr key={parametr.id}>
                <th scope="row">{parametr.nazev}</th>
                <td>{parametr.hodnota}</td>
              </tr>
            ))}
          </tbody>
        </table>
      )}

      {polozka.popis && <div className="popis">{polozka.popis}</div>}
    </article>
  )
}

async function najdiPolozku(slug: string): Promise<Product | null> {
  const payload = await getPayload({ config: await config })

  const { docs } = await payload.find({
    collection: 'products',
    where: {
      slug: { equals: slug },
      skryto: { not_equals: true },
    },
    depth: 1,
    limit: 1,
  })

  return docs[0] ?? null
}