import { createMemo, createSignal, For, Show } from "solid-js";
import { StackCard } from "./StackCard";
import type { CardId, StackBodies, StackCardSpec } from "./types";

interface StackDeckProps {
  active: CardId;
  onActiveChange: (id: CardId) => void;
  onBack: () => void;
  cards: readonly StackCardSpec[];
  bodies: StackBodies;
}

const EXPANDED_H = 248;
const FOCUS_H = 420;
const TAB_H = 46;
const TAB_OVERLAP = 14;

export function StackDeck(props: StackDeckProps) {
  const [deckOpen, setDeckOpen] = createSignal(true);
  const activeIndex = createMemo(() => {
    const idx = props.cards.findIndex((card) => card.id === props.active);
    return idx >= 0 ? idx : 0;
  });

  return (
    <section class="stk-shell" aria-label="Settings">
      <div class="stk-mast">
        <button
          class="stk-back"
          onClick={props.onBack}
          aria-label="Back"
          type="button"
        >
          <svg width="7" height="12" viewBox="0 0 7 12" fill="none" stroke="currentColor" stroke-width="1.1" stroke-linecap="round" stroke-linejoin="round">
            <path d="M6 1L1 6L6 11" />
          </svg>
        </button>
        <div class="stk-mast-title">Settings</div>
        <div class="stk-mast-meta">
          {activeIndex() + 1} / {props.cards.length}
        </div>
      </div>

      <div class={`stk-deck ${deckOpen() ? "is-open" : "is-focused"}`}>
        <For each={props.cards}>
          {(card, index) => {
            const active = () => card.id === props.active;
            const concealed = () => !deckOpen() && !active();
            const distance = createMemo(() => {
              const ai = activeIndex();
              const ci = index();
              if (ci === ai) return -1;
              if (ci > ai) return ci - ai - 1;
              return props.cards.length - ai + ci - 1;
            });
            const top = () => {
              if (active()) return 0;
              if (!deckOpen()) return FOCUS_H + 44 + distance() * 8;
              return EXPANDED_H + distance() * (TAB_H - TAB_OVERLAP);
            };
            const zIndex = () => (active() ? 99 : 50 - distance());

            return (
              <StackCard
                spec={card}
                active={active()}
                focused={!deckOpen() && active()}
                concealed={concealed()}
                top={top()}
                zIndex={zIndex()}
                height={active() ? (deckOpen() ? EXPANDED_H : FOCUS_H) : TAB_H + 4}
                onClick={() => {
                  if (active()) return;
                  props.onActiveChange(card.id);
                  setDeckOpen(false);
                }}
              >
                {props.bodies[card.id]}
              </StackCard>
            );
          }}
        </For>
        <Show when={!deckOpen()}>
          <button
            class="stk-tray-handle"
            type="button"
            aria-label="Show settings sections"
            onClick={() => setDeckOpen(true)}
          >
            <span>sections</span>
          </button>
        </Show>
      </div>
    </section>
  );
}