// Panels overlay the canvas: revealing tools never resizes or replaces it.
export class Menus {
  constructor(canOpen, ignoreOutsidePointer) {
    this.canOpen = canOpen;
    this.items = [
      ["tools-toggle", "tools-panel"],
      ["settings-toggle", "inspector"],
    ].map(([button, panel]) => ({
      button: document.getElementById(button),
      panel: document.getElementById(panel),
    }));
    for (const item of this.items) {
      item.button.addEventListener("pointerenter", (e) => {
        if (["pen", "mouse"].includes(e.pointerType) && e.buttons === 0)
          this.open(item);
      });
      item.button.addEventListener("click", () => {
        if (this.current === item && this.pinned) this.close();
        else this.open(item, true);
      });
      item.button.addEventListener("keydown", (e) => {
        if (e.key === "ArrowDown") {
          e.preventDefault();
          this.open(item, true, true);
        }
      });
      for (const el of [item.button, item.panel]) {
        el.addEventListener("pointerenter", () => clearTimeout(this.timer));
        el.addEventListener("pointerleave", () => {
          clearTimeout(this.timer);
          this.timer = setTimeout(() => {
            if (!this.pinned) this.close(false);
          }, 250);
        });
      }
      item.panel.addEventListener("pointerdown", () => {
        this.pinned = true;
        clearTimeout(this.timer);
      });
      item.panel.addEventListener("focusin", () => {
        this.pinned = true;
        clearTimeout(this.timer);
      });
      item.panel.querySelector("[data-close]").onclick = () => this.close();
    }
    document.addEventListener(
      "pointerdown",
      (e) => {
        if (
          this.current &&
          !ignoreOutsidePointer(e) &&
          !this.current.panel.contains(e.target) &&
          !this.current.button.contains(e.target)
        )
          this.close(false);
      },
      true,
    );
    document.addEventListener(
      "keydown",
      (e) => {
        if (
          e.key === "Escape" &&
          this.current &&
          !document.querySelector("dialog[open]")
        ) {
          e.preventDefault();
          e.stopPropagation();
          this.close();
        }
      },
      true,
    );
    window.addEventListener("resize", () => this.close(false));
  }
  open(item, pin = false, focus = false) {
    if (!this.canOpen() || document.querySelector("dialog[open]")) return;
    clearTimeout(this.timer);
    if (this.current !== item) {
      this.close(false);
      this.current = item;
      this.pinned = false;
    }
    this.pinned ||= pin;
    item.panel.hidden = false;
    const top = Math.max(
      12,
      Math.min(
        item.button.getBoundingClientRect().top,
        window.innerHeight - item.panel.offsetHeight - 12,
      ),
    );
    item.panel.style.top = `${top}px`;
    item.panel.style.maxHeight = `calc(100dvh - ${top + 12}px)`;
    item.button.setAttribute("aria-expanded", "true");
    if (focus)
      item.panel.querySelector("button:not(:disabled),input,select")?.focus();
  }
  close(restore = true) {
    clearTimeout(this.timer);
    if (!this.current) return;
    const item = this.current;
    this.current = null;
    this.pinned = false;
    item.panel.hidden = true;
    item.button.setAttribute("aria-expanded", "false");
    if (restore) item.button.focus();
  }
}