/**
 * Loading, creating, switching and deleting projects, plus the two toolbar menus that trigger
 * it. Talks only to the store and the editor state – no widgets of its own beyond the menus.
 */
import { SetActiveSceneCommand } from '../core/commands/assetCommands';
import { listScenes } from '../core/model/Project';
import type { ProjectStore } from '../core/store/ProjectStore';
import { Dialog, Menu, type MenuItem, type Widget } from '../ui';
import type { EditorState } from './state';

export class ProjectSession {
  /**
   * `beforeSwitch` runs before a different project is loaded or the current one is deleted –
   * a run in progress has to end first, since it holds a copy of the project being replaced.
   */
  constructor(
    private readonly state: EditorState,
    private readonly store: ProjectStore,
    private readonly beforeSwitch: () => void,
  ) {}

  /** Opens the project named in the URL, else the first one on the server, else a new one. */
  async boot(): Promise<void> {
    const wanted = new URLSearchParams(location.search).get('project');
    try {
      if (wanted) {
        await this.open(wanted);
        return;
      }
      await this.openFirstOrCreate();
    } catch (error) {
      this.state.setNotice(
        `Could not load project: ${error instanceof Error ? error.message : String(error)}`,
      );
    }
  }

  private async open(id: string): Promise<void> {
    this.beforeSwitch();
    const loaded = await this.store.load(id);
    this.state.loadProject(loaded.project, loaded.revision);
    const url = new URL(location.href);
    url.searchParams.set('project', id);
    history.replaceState(null, '', url);
  }

  private async openFirstOrCreate(): Promise<void> {
    const list = await this.store.list();
    if (list[0]) await this.open(list[0].id);
    else await this.create('My first project');
  }

  private async create(name: string): Promise<void> {
    const created = await this.store.create(name);
    await this.open(created.project.id);
  }

  private async deleteCurrent(): Promise<void> {
    this.beforeSwitch();
    await this.store.delete(this.state.project.id);
    await this.openFirstOrCreate();
  }

  openProjectMenu(anchor: Widget): void {
    const open = async () => {
      const list = await this.store.list();
      const items: MenuItem[] = [
        { label: 'New project', onSelect: () => void this.create(`Project ${list.length + 1}`) },
        ...list.map((p) => ({
          label: p.id === this.state.project.id ? `● ${p.name}` : p.name,
          onSelect: () => void this.open(p.id),
          disabled: p.id === this.state.project.id,
        })),
        {
          label: 'Delete this project…',
          danger: true,
          onSelect: () =>
            new Dialog(
              `Delete project "${this.state.project.name}"?`,
              'All assets and scenes are removed permanently.',
              [
                { label: 'Cancel' },
                { label: 'Delete', danger: true, onClick: () => void this.deleteCurrent() },
              ],
            ).openCentered(),
        },
      ];
      new Menu(items).openBelow(anchor);
    };
    void open().catch((error) => this.state.setNotice(String(error)));
  }

  openSceneMenu(anchor: Widget): void {
    const items: MenuItem[] = listScenes(this.state.project).map((scene) => ({
      label: scene.id === this.state.project.activeSceneId ? `● ${scene.name}` : scene.name,
      onSelect: () => this.state.execute(new SetActiveSceneCommand(scene.id)),
    }));
    if (items.length === 0)
      items.push({ label: 'No scenes – create one in Assets', onSelect: () => {}, disabled: true });
    new Menu(items).openBelow(anchor);
  }
}