import "./ui_template_overlay.css";
import { t } from "./ui_template_locale";

const TITLE_OVERLAY_STATE_KEY = "frd_workflow_title_overlay_open";
const PROGRESS_OVERLAY_STATE_KEY = "frd_workflow_progress_overlay_open";

export interface WorkflowOverlayOptions {
  title: string;
  progressContent: HTMLElement;
  optionsContent?: HTMLElement;
  showTitlePanel?: boolean;
  onOptionsOpenChange?: (isOpen: boolean) => void;
}

export interface WorkflowOverlayHandle {
  root: HTMLElement;
  setTitleOpen: (isOpen: boolean) => void;
  setProgressOpen: (isOpen: boolean) => void;
}

export interface WorkflowPanelHandle {
  root: HTMLButtonElement;
  setOpen: (isOpen: boolean) => void;
}

export function createWorkflowPanelHandle(placement: "side" | "bottom"): WorkflowPanelHandle {
  const root = document.createElement("button");
  root.type = "button";
  root.className = `ui-workflow-overlay__handle ui-workflow-overlay__handle--${placement}`;
  const icon = document.createElement("span");
  icon.className = "ui-workflow-overlay__handle-icon";
  root.append(icon);

  function setOpen(isOpen: boolean): void {
    const rotation = placement === "side" ? (isOpen ? 180 : 0) : isOpen ? 90 : -90;
    icon.style.transform = `rotate(${rotation}deg)`;
    root.title = t(isOpen ? "Workflow_Overlay_Collapse" : "Workflow_Overlay_Expand");
    root.setAttribute("aria-label", root.title);
    root.setAttribute("aria-expanded", String(isOpen));
  }

  return { root, setOpen };
}

function readOpenState(key: string): boolean {
  return sessionStorage.getItem(key) !== "false";
}

function createPanel(
  variant: "title" | "progress",
  titleText: string,
  body: HTMLElement,
  storageKey: string,
  onOpenChange?: (isOpen: boolean) => void,
): { root: HTMLElement; setOpen: (isOpen: boolean) => void } {
  const root = document.createElement("aside");
  root.className = `ui-workflow-overlay__panel ui-workflow-overlay__panel--${variant}`;

  // title 패널은 사이드바 도킹형 — 토글이 패널 우측 가장자리 세로 중앙 핸들로 나감
  const isSidebar = variant === "title";

  const header = document.createElement("div");
  header.className = "ui-workflow-overlay__header";
  const title = document.createElement("h2");
  title.className = "ui-workflow-overlay__title";
  title.textContent = titleText;
  const panelHandle = isSidebar ? createWorkflowPanelHandle("side") : null;
  const toggle = panelHandle?.root ?? document.createElement("button");
  if (!panelHandle) {
    toggle.type = "button";
    toggle.className = "ui-workflow-overlay__toggle";
  }

  if (isSidebar) {
    header.append(title);
    root.append(header, toggle);
  } else {
    header.append(title, toggle);
    root.append(header);
  }
  if (body.childElementCount > 0) {
    body.classList.add("ui-workflow-overlay__body");
    root.append(body);
  }

  function setOpen(isOpen: boolean): void {
    root.classList.toggle("is-collapsed", !isOpen);
    if (panelHandle) panelHandle.setOpen(isOpen);
    else {
      toggle.textContent = isOpen ? "−" : "+";
      toggle.title = t(isOpen ? "Workflow_Overlay_Collapse" : "Workflow_Overlay_Expand");
      toggle.setAttribute("aria-label", toggle.title);
      toggle.setAttribute("aria-expanded", String(isOpen));
    }
    sessionStorage.setItem(storageKey, String(isOpen));
    onOpenChange?.(isOpen);
  }

  function toggleOpen(): void {
    setOpen(root.classList.contains("is-collapsed"));
  }

  title.tabIndex = 0;
  title.setAttribute("role", "button");
  title.addEventListener("click", toggleOpen);
  title.addEventListener("keydown", (event) => {
    if (event.key === "Enter" || event.key === " ") {
      event.preventDefault();
      toggleOpen();
    }
  });
  toggle.addEventListener("click", toggleOpen);
  setOpen(readOpenState(storageKey));
  return { root, setOpen };
}

export function createWorkflowOverlays(options: WorkflowOverlayOptions): WorkflowOverlayHandle {
  const root = document.createElement("div");
  root.className = "ui-workflow-overlay";

  const progressBody = document.createElement("div");
  progressBody.append(options.progressContent);

  const progressPanel = createPanel(
    "progress",
    t("Workflow_Progress_Title"),
    progressBody,
    PROGRESS_OVERLAY_STATE_KEY,
  );
  let setTitleOpen = (_isOpen: boolean): void => {};
  if (options.showTitlePanel !== false) {
    const titleBody = document.createElement("div");
    if (options.optionsContent) titleBody.append(options.optionsContent);
    const titlePanel = createPanel(
      "title",
      options.title,
      titleBody,
      TITLE_OVERLAY_STATE_KEY,
      options.onOptionsOpenChange,
    );
    root.append(titlePanel.root);
    setTitleOpen = titlePanel.setOpen;
  }
  root.append(progressPanel.root);

  return {
    root,
    setTitleOpen,
    setProgressOpen: progressPanel.setOpen,
  };
}