import { BaseComponent } from "obsidian";
import { mount, unmount, type Component } from "svelte";
import type { MountedSvelteComponent, PropsOf } from "../ComponentTypes";

export default class ComponentMounter extends BaseComponent {
    private readonly hostEl: HTMLElement;
    private _mounted: MountedSvelteComponent | null = null;

    constructor(hostEl: HTMLElement) {
        super();
        this.hostEl = hostEl;
    }

    public async setup<TComponent extends Component<any, any>>(
        component: TComponent,
        props: PropsOf<TComponent>
    ): Promise<void> {
        await this.destroy();

        this._mounted = mount(component, { target: this.hostEl, props });
    }

    public get mounted(): MountedSvelteComponent {
        if (!this._mounted) throw new Error("Component is not mounted");
        return this._mounted;
    }

    public async destroy(): Promise<void> {
        if (!this._mounted) return;

        const mounted = this._mounted;
        this._mounted = null;
        await unmount(mounted);
    }
}