import React from "react";
import { ExcalidrawElement } from "../element/types";
import { AppState } from "../types";

/** if false, the action should be prevented */
export type ActionResult =
  | {
      elements?: readonly ExcalidrawElement[] | null;
      appState?: MarkOptional<AppState, "offsetTop" | "offsetLeft"> | null;
      commitToHistory: boolean;
      syncHistory?: boolean;
    }
  | false;

type ActionFn = (
  elements: readonly ExcalidrawElement[],
  appState: AppState,
  formData: any,
) => ActionResult;

export type UpdaterFn = (res: ActionResult, commitToHistory?: boolean) => void;
export type ActionFilterFn = (action: Action) => void;

export type ActionName =
  | "sendBackward"
  | "bringForward"
  | "sendToBack"
  | "bringToFront"
  | "copyStyles"
  | "selectAll"
  | "pasteStyles"
  | "changeStrokeColor"
  | "changeBackgroundColor"
  | "changeFillStyle"
  | "changeStrokeWidth"
  | "changeSloppiness"
  | "changeStrokeStyle"
  | "changeOpacity"
  | "changeFontSize"
  | "toggleCanvasMenu"
  | "toggleEditMenu"
  | "undo"
  | "redo"
  | "finalize"
  | "changeProjectName"
  | "changeExportBackground"
  | "changeShouldAddWatermark"
  | "saveScene"
  | "saveAsScene"
  | "loadScene"
  | "duplicateSelection"
  | "deleteSelectedElements"
  | "changeViewBackgroundColor"
  | "clearCanvas"
  | "zoomIn"
  | "zoomOut"
  | "resetZoom"
  | "zoomToFit"
  | "changeFontFamily"
  | "changeTextAlign"
  | "toggleFullScreen"
  | "toggleShortcuts"
  | "group"
  | "ungroup"
  | "goToCollaborator"
  | "addToLibrary";

export interface Action {
  name: ActionName;
  PanelComponent?: React.FC<{
    elements: readonly ExcalidrawElement[];
    appState: AppState;
    updateData: (formData?: any) => void;
    id?: string;
  }>;
  perform: ActionFn;
  keyPriority?: number;
  keyTest?: (
    event: KeyboardEvent,
    appState: AppState,
    elements: readonly ExcalidrawElement[],
  ) => boolean;
  contextItemLabel?: string;
  contextMenuOrder?: number;
  contextItemPredicate?: (
    elements: readonly ExcalidrawElement[],
    appState: AppState,
  ) => boolean;
}

export interface ActionsManagerInterface {
  actions: {
    [actionName in ActionName]: Action;
  };
  registerAction: (action: Action) => void;
  handleKeyDown: (event: KeyboardEvent) => boolean;
  getContextMenuItems: (
    actionFilter: ActionFilterFn,
  ) => { label: string; action: () => void }[];
  renderAction: (name: ActionName) => React.ReactElement | null;
}