import { mountAdmin } from "./admin.js";
import { mountChanges } from "./changes.js";
import { h, replace } from "./dom.js";
import { mountFiles } from "./files.js";
import { mountInbox } from "./inbox.js";
import { mountSettings } from "./settings.js";
import { mountTranscript } from "./task.js";
import { mountTasks } from "./tasks.js";
import { mountTodo } from "./todo.js";

export type View = "transcript" | "changes" | "files" | "tasks" | "todo" | "inbox" | "admin" | "settings";

const views: Record<View, { label: string; mount: (root: HTMLElement) => () => void }> = {
  transcript: { label: "Transcript", mount: mountTranscript },
  changes: { label: "Changes", mount: (root) => mountChanges(root) },
  files: { label: "Files", mount: mountFiles },
  tasks: { label: "Tasks", mount: mountTasks },
  todo: { label: "Todo", mount: mountTodo },
  inbox: { label: "Inbox", mount: mountInbox },
  admin: { label: "Admin", mount: mountAdmin },
  settings: { label: "Settings", mount: mountSettings },
};

const order: View[] = ["transcript", "changes", "files", "tasks", "todo", "inbox", "admin", "settings"];

const panes: Pane[] = [];

export function openTranscript(): void {
  if (panes.some((p) => p.current() === "transcript")) {
    return;
  }
  (panes.find((p) => p.current() !== "tasks") ?? panes[0])?.show("transcript");
}

export function openChanges(from: Element): void {
  if (panes.some((p) => p.current() === "changes")) {
    return;
  }
  (panes.find((p) => !p.el.contains(from)) ?? panes[0])?.show("changes");
}

export class Pane {
  readonly el: HTMLElement;
  private readonly tabs: HTMLElement;
  private readonly body: HTMLElement;
  private view: View;
  private dispose: () => void = () => {};

  constructor(private readonly key: string, fallback: View) {
    this.tabs = h("nav", { class: "pane-tabs" });
    this.body = h("div", { class: "pane-body" });
    this.el = h("section", { class: "pane" }, this.tabs, this.body);

    const saved = localStorage.getItem(this.storageKey()) as View | null;
    this.view = saved && saved in views ? saved : fallback;
    this.show(this.view);
    panes.push(this);
  }

  current(): View {
    return this.view;
  }

  show(view: View): void {
    this.dispose();
    this.view = view;
    localStorage.setItem(this.storageKey(), view);

    replace(
      this.tabs,
      ...order.map((v) => {
        const b = h("button", { class: v === view ? "active" : "" }, views[v].label);
        b.onclick = () => this.show(v);
        return b;
      }),
    );

    const root = h("div", { class: `view view-${view}` });
    replace(this.body, root);
    this.dispose = views[view].mount(root);
  }

  private storageKey(): string {
    return `byre.pane.${this.key}`;
  }
}