import {$getSelection, $insertNodes, LexicalEditor, LexicalNode} from "lexical";
import {HttpError} from "../../services/http";
import {EditorUiContext} from "../ui/framework/core";
import * as DrawIO from "../../services/drawio";
import {$createDiagramNode, DiagramNode} from "../nodes/diagram";
import {ImageManager} from "../../components";
import {EditorImageData} from "./images";
import {$getNodeFromSelection, getLastSelection} from "./selection";

export function $isDiagramNode(node: LexicalNode | null | undefined): node is DiagramNode {
    return node instanceof DiagramNode;
}

function handleUploadError(error: HttpError, context: EditorUiContext): void {
    if (error.status === 413) {
        window.$events.emit('error', context.options.translations.serverUploadLimitText || '');
    } else {
        window.$events.emit('error', context.options.translations.imageUploadErrorText || '');
    }
    console.error(error);
}

async function loadDiagramIdFromNode(editor: LexicalEditor, node: DiagramNode): Promise<string> {
    const drawingId = await new Promise<string>((res, rej) => {
        editor.getEditorState().read(() => {
            const {id: drawingId} = node.getDrawingIdAndUrl();
            res(drawingId);
        });
    });

    return drawingId || '';
}

async function updateDrawingNodeFromData(context: EditorUiContext, node: DiagramNode, pngData: string, isNew: boolean): Promise<void> {
    DrawIO.close();

    if (isNew) {
        const loadingImage: string = window.baseUrl('/loading.gif');
        context.editor.update(() => {
            node.setDrawingIdAndUrl('', loadingImage);
        });
    }

    try {
        const img = await DrawIO.upload(pngData, context.options.pageId);
        context.editor.update(() => {
            node.setDrawingIdAndUrl(String(img.id), img.url);
        });
    } catch (err) {
        if (err instanceof HttpError) {
            handleUploadError(err, context);
        }

        if (isNew) {
            context.editor.update(() => {
                node.remove();
            });
        }

        throw new Error(`Failed to save image with error: ${err}`);
    }
}

export function $openDrawingEditorForNode(context: EditorUiContext, node: DiagramNode): void {
    let isNew = false;
    DrawIO.show(context.options.drawioUrl, async () => {
        const drawingId = await loadDiagramIdFromNode(context.editor, node);
        isNew = !drawingId;
        return isNew ? '' : DrawIO.load(drawingId);
    }, async (pngData: string) => {
        return updateDrawingNodeFromData(context, node, pngData, isNew);
    });
}

export function showDiagramManager(callback: (image: EditorImageData) => any) {
    const imageManager: ImageManager = window.$components.first('image-manager') as ImageManager;
    imageManager.show((image: EditorImageData) => {
        callback(image);
    }, 'drawio');
}

export function showDiagramManagerForInsert(context: EditorUiContext) {
    const selection = getLastSelection(context.editor);
    showDiagramManager((image: EditorImageData) => {
        context.editor.update(() => {
            const diagramNode = $createDiagramNode(image.id, image.url);
            const selectedDiagram = $getNodeFromSelection(selection, $isDiagramNode);
            if ($isDiagramNode(selectedDiagram)) {
                selectedDiagram.replace(diagramNode);
            } else {
                $insertNodes([diagramNode]);
            }
        });
    });
}