import {
  EdgelessCRUDIdentifier,
  getSurfaceBlock,
} from '@blocksuite/affine-block-surface';
import {
  EDGELESS_TEXT_BLOCK_MIN_HEIGHT,
  EDGELESS_TEXT_BLOCK_MIN_WIDTH,
  EdgelessTextBlockModel,
} from '@blocksuite/affine-model';
import { focusTextModel } from '@blocksuite/affine-rich-text';
import { matchModels } from '@blocksuite/affine-shared/utils';
import { Bound } from '@blocksuite/global/gfx';
import type { Command } from '@blocksuite/std';
import { GfxControllerIdentifier } from '@blocksuite/std/gfx';

export const insertEdgelessTextCommand: Command<
  {
    x: number;
    y: number;
  },
  {
    textId: string;
  }
> = (ctx, next) => {
  const { std, x, y } = ctx;
  const host = std.host;
  const doc = host.store;
  const surface = getSurfaceBlock(doc);
  if (!surface) {
    next();
    return;
  }
  const gfx = std.get(GfxControllerIdentifier);
  const zoom = gfx.viewport.zoom;
  const selection = gfx.selection;

  const textId = std.get(EdgelessCRUDIdentifier).addBlock(
    'affine:edgeless-text',
    {
      xywh: new Bound(
        x - (EDGELESS_TEXT_BLOCK_MIN_WIDTH * zoom) / 2,
        y - (EDGELESS_TEXT_BLOCK_MIN_HEIGHT * zoom) / 2,
        EDGELESS_TEXT_BLOCK_MIN_WIDTH * zoom,
        EDGELESS_TEXT_BLOCK_MIN_HEIGHT * zoom
      ).serialize(),
    },
    surface.id
  );

  const blockId = doc.addBlock('affine:paragraph', { type: 'text' }, textId);
  host.updateComplete
    .then(() => {
      selection.set({
        elements: [textId],
        editing: true,
      });
      const disposable = selection.slots.updated.subscribe(() => {
        const editing = selection.editing;
        const id = selection.selectedIds[0];
        if (!editing || id !== textId) {
          const textBlock = host.view.getBlock(textId);
          const model = textBlock?.model;
          if (matchModels(model, [EdgelessTextBlockModel])) {
            model.props.hasMaxWidth = true;
          }

          disposable.unsubscribe();
        }
      });

      focusTextModel(std, blockId);
      host.updateComplete
        .then(() => {
          const edgelessText = host.view.getBlock(textId);
          const paragraph = host.view.getBlock(blockId);
          if (!edgelessText || !paragraph) return;

          const abortController = new AbortController();
          edgelessText.addEventListener(
            'focusout',
            e => {
              if (edgelessText.model.children.length > 1) return;
              if (
                !paragraph.model.text ||
                (paragraph.model.text.length === 0 && e.relatedTarget !== null)
              ) {
                doc.deleteBlock(edgelessText.model);
              }
            },
            {
              once: true,
              signal: abortController.signal,
            }
          );
          const subscription = paragraph.model.deleted.subscribe(() => {
            subscription.unsubscribe();
            abortController.abort();
          });
          edgelessText.addEventListener(
            'beforeinput',
            () => {
              abortController.abort();
            },
            {
              once: true,
            }
          );
        })
        .catch(console.error);
    })
    .catch(console.error);

  next({ textId });
};