///////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2002-2025, Open Design Alliance (the "Alliance").
// All rights reserved.
//
// This software and its documentation and related materials are owned by
// the Alliance. The software may only be incorporated into application
// programs owned by members of the Alliance, subject to a signed
// Membership Agreement and Supplemental Software License Agreement with the
// Alliance. The structure and organization of this software are the valuable
// trade secrets of the Alliance and its suppliers. The software is also
// protected by copyright law and international treaty provisions. Application
// programs incorporating this software must include the following statement
// with their copyright notices:
//
//   This application incorporates Open Design Alliance software pursuant to a
//   license agreement with Open Design Alliance.
//   Open Design Alliance Copyright (C) 2002-2025 by Open Design Alliance.
//   All rights reserved.
//
// By use of this software, its documentation or related materials, you
// acknowledge and accept the above terms.
///////////////////////////////////////////////////////////////////////////////

import { IViewer } from "../viewer/IViewer";
import { ICommand, ICommandHandler, ICommandDescription, ICommandsMap, ICommandsRegistry } from "./ICommands";

class CommandsRegistry implements ICommandsRegistry {
  private readonly _commands = new Map<string, ICommand>();

  registerCommand(id: string, handler: ICommandHandler, description?: ICommandDescription, thisArg?: any): void {
    this._commands.set(id, { id, handler, thisArg, description });
  }

  registerCommandAlias(id: string, alias: string): void {
    this.registerCommand(alias, (viewer: IViewer, ...args) => this.executeCommand(id, viewer, ...args));
  }

  getCommand(id: string): ICommand | undefined {
    return this._commands.get(id);
  }

  getCommands(): ICommandsMap {
    const map = new Map<string, ICommand>();
    this._commands.forEach((value, key) => map.set(key, value));
    return map;
  }

  executeCommand(id: string, viewer: IViewer, ...args: any[]): any {
    const command = this._commands.get(id);
    if (!command) {
      if (viewer) {
        const isDraggerCommand = viewer.draggers.includes(id);
        if (isDraggerCommand) return viewer.setActiveDragger(id);
      }

      console.warn(`Command '${id}' not found`);
      return undefined;
    }

    const { handler, thisArg } = command;
    const result = handler.apply(thisArg, [viewer, ...args]);

    viewer?.emit({ type: "command", data: id, args });

    return result;
  }
}

const _commandsRegistry = new Map<string, CommandsRegistry>();

function commandsRegistry(viewerType = ""): ICommandsRegistry {
  let result = _commandsRegistry.get(viewerType);
  if (!result) {
    result = new CommandsRegistry();
    _commandsRegistry.set(viewerType, result);
  }
  return result;
}

export { commandsRegistry };