// Public pages: item detail dialog and grid/list toggle.
import { h, icon, openDialog, storageGet, storageSet } from "./common.js";

// Each ranked list on the page ships its items as JSON next to the markup.
const lists = [...document.querySelectorAll("[data-items]")].map((ol) => {
  const data = JSON.parse(ol.nextElementSibling?.textContent || "[]");
  return { ol, items: data, title: ol.dataset.listTitle, square: ol.classList.contains("aspect-square") };
});

function findItem(id) {
  for (const list of lists) {
    const idx = list.items.findIndex((it) => it.id === id);
    if (idx >= 0) return { list, idx };
  }
  return null;
}

let current = null;

function renderDialog(list, idx) {
  const it = list.items[idx];
  const art = it.image
    ? h("img", { src: it.image, alt: `Artwork for ${it.title}` })
    : h("span", { class: "art-fallback" }, icon("image"));
  const sub = [it.subtitle, it.year].filter(Boolean).join(" · ");
  const topClass = it.rank <= 3 ? ` top${it.rank}` : "";
  const meta = it.meta.filter((m) => m.label !== "Production");

  const prev = h("button", { type: "button", class: "icon-btn", "aria-label": "Previous", disabled: idx === 0, onclick: () => show(list, idx - 1) }, icon("chevron-left"));
  const next = h("button", { type: "button", class: "icon-btn", "aria-label": "Next", disabled: idx === list.items.length - 1, onclick: () => show(list, idx + 1) }, icon("chevron-right"));

  return h("div", { class: "item-dialog-inner" },
    h("div", { class: "dlg-art" }, art),
    h("div", { class: "dlg-body" },
      h("button", { type: "button", class: "icon-btn dlg-close", "aria-label": "Close", onclick: () => current?.close() }, icon("x")),
      h("p", { class: "dlg-rank" + topClass }, h("strong", {}, `#${it.rank}`), h("span", {}, list.title)),
      h("h2", { class: "dlg-title" }, it.title),
      sub && h("p", { class: "dlg-sub" }, sub),
      it.badge && h("span", { class: "badge" }, it.badge),
      meta.length > 0 && h("dl", { class: "dlg-meta" }, meta.map((m) => [h("dt", {}, m.label), h("dd", {}, m.value)])),
      it.note && h("blockquote", { class: "dlg-note" }, it.note),
      h("div", { class: "dlg-actions" },
        it.link && h("a", { class: "btn btn--sm", href: it.link, target: "_blank", rel: "noopener noreferrer" },
          icon("external"), it.source ? `View on ${it.source}` : "Learn more"),
        h("div", { class: "dlg-nav" }, prev, next),
      ),
    ),
  );
}

function show(list, idx) {
  const content = renderDialog(list, idx);
  if (current) {
    current.replaceChildren(content);
  } else {
    current = openDialog(content, {
      className: "item-dialog" + (list.square ? " is-square" : ""),
      onClose: () => { current = null; },
    });
    current.addEventListener("keydown", (e) => {
      if (e.key === "ArrowLeft") current.querySelector(".dlg-nav button:first-child")?.click();
      if (e.key === "ArrowRight") current.querySelector(".dlg-nav button:last-child")?.click();
    });
  }
  current.setAttribute("aria-label", `#${list.items[idx].rank} ${list.items[idx].title}`);
}

document.addEventListener("click", (e) => {
  const btn = e.target.closest("[data-item]");
  if (!btn) return;
  const found = findItem(Number(btn.dataset.item));
  if (found) show(found.list, found.idx);
});

// Grid / list toggle on list pages, remembered per list in this browser.
const toggle = document.querySelector("[data-layout-toggle]");
if (toggle) {
  const key = "canon:layout:" + toggle.dataset.key;
  const apply = (layout) => {
    for (const { ol } of lists) {
      ol.classList.toggle("items--grid", layout === "grid");
      ol.classList.toggle("items--rows", layout === "rows");
    }
    for (const b of toggle.querySelectorAll("button")) b.setAttribute("aria-pressed", String(b.dataset.layout === layout));
  };
  apply(storageGet(key) || toggle.dataset.default);
  toggle.addEventListener("click", (e) => {
    const b = e.target.closest("button[data-layout]");
    if (!b) return;
    apply(b.dataset.layout);
    storageSet(key, b.dataset.layout);
  });
}