import * as ko from "knockout";
import { IHtmlEditor } from "@paperbits/common/editing/IHtmlEditor";
import { EventManager, Events } from "@paperbits/common/events";
import { BlockModel } from "@paperbits/common/text/models";
import { TextblockViewModel } from "../../textblock/ko/textblockViewModel";


export class TextblockBindingHandler {
    constructor(
        eventManager: EventManager,
        htmlEditorFactory: any
    ) {
        ko.bindingHandlers["textblock"] = {
            init(element: HTMLElement, valueAccessor: () => BlockModel[], allBindings: any, viewModel: TextblockViewModel): void {
                const config = valueAccessor();
                const htmlEditor: IHtmlEditor = htmlEditorFactory.createHtmlEditor();

                htmlEditor.onStateChange = (newContent: BlockModel[]) => {
                    viewModel["widgetBinding"].model.content = newContent;
                    eventManager.dispatchEvent(Events.ContentUpdate); // TODO: Move this event emit to TextblockEditor
                };

                const onEscapeKeyPressed = () => htmlEditor.detachFromElement();
                eventManager.addEventListener("onEscape", onEscapeKeyPressed);

                const onViewClose = () => htmlEditor.detachFromElement();
                eventManager.addEventListener("onViewClose", onViewClose);

                const onHtmlEditorRequested = (model) => {
                    if (viewModel["widgetBinding"].model == model) {
                        htmlEditor.enable(element);
                    }
                    else {
                        htmlEditor.enable();
                    }
                }

                htmlEditor.attachToElement(element);
                htmlEditor.setState(ko.unwrap(config));

                eventManager.addEventListener("enableHtmlEditor", onHtmlEditorRequested);

                ko.utils.domNodeDisposal.addDisposeCallback(element, () => {
                    eventManager.removeEventListener("onEscape", onEscapeKeyPressed);
                    eventManager.removeEventListener("onViewClose", onViewClose);
                    eventManager.removeEventListener("enableHtmlEditor", onHtmlEditorRequested);
                    htmlEditor.detachFromElement();
                });
            }
        };
    }
}