import { createOpaqueId } from "../core/ids";
import type { EditorSelection } from "../core/selection";
import type { ToolMode } from "../core/tool-mode";
import { cloneBoxBrush, type BoxBrush } from "../document/brushes";

import { cloneSelectionForCommand, removeBrush } from "./brush-command-helpers";
import type { EditorCommand } from "./command";

function selectionIncludesBrush(selection: EditorSelection, brushId: string): boolean {
  return (
    (selection.kind === "brushes" && selection.ids.includes(brushId)) ||
    ((selection.kind === "brushFace" || selection.kind === "brushEdge" || selection.kind === "brushVertex") &&
      selection.brushId === brushId)
  );
}

export function createDeleteBoxBrushCommand(brushId: string): EditorCommand {
  let previousBrush: BoxBrush | null = null;
  let previousSelection: EditorSelection | null = null;
  let previousToolMode: ToolMode | null = null;

  return {
    id: createOpaqueId("command"),
    label: "Delete box brush",
    execute(context) {
      const currentDocument = context.getDocument();
      const currentBrush = currentDocument.brushes[brushId];

      if (currentBrush === undefined) {
        throw new Error(`Box brush ${brushId} does not exist.`);
      }

      if (previousBrush === null) {
        previousBrush = cloneBoxBrush(currentBrush);
      }

      if (previousSelection === null) {
        previousSelection = cloneSelectionForCommand(context.getSelection());
      }

      if (previousToolMode === null) {
        previousToolMode = context.getToolMode();
      }

      context.setDocument(removeBrush(currentDocument, brushId));

      if (selectionIncludesBrush(context.getSelection(), brushId)) {
        context.setSelection({
          kind: "none"
        });
      }

      context.setToolMode("select");
    },
    undo(context) {
      if (previousBrush === null) {
        return;
      }

      const currentDocument = context.getDocument();

      context.setDocument({
        ...currentDocument,
        brushes: {
          ...currentDocument.brushes,
          [previousBrush.id]: cloneBoxBrush(previousBrush)
        }
      });

      if (previousSelection !== null) {
        context.setSelection(previousSelection);
      }

      if (previousToolMode !== null) {
        context.setToolMode(previousToolMode);
      }
    }
  };
}