import React from 'react';
import { PanelSection, ToolSettings } from '@ohif/ui-next';
import { useSystem, useToolbar } from '@ohif/core';
import classnames from 'classnames';

interface ButtonProps {
  isActive?: boolean;
  options?: unknown;
}

/**
 * A toolbox is a collection of buttons and commands that they invoke, used to provide
 * custom control panels to users. This component is a generic UI component that
 * interacts with services and commands in a generic fashion. While it might
 * seem unconventional to import it from the UI and integrate it into the JSX,
 * it belongs in the UI components as there isn't anything in this component that
 * couldn't be used for a completely different type of app. It plays a crucial
 * role in enhancing the app with a toolbox by providing a way to integrate
 * and display various tools and their corresponding options
 */
export function Toolbox({ buttonSectionId, title }: { buttonSectionId: string; title: string }) {
  const { servicesManager } = useSystem();
  const { toolbarService } = servicesManager.services;

  const { toolbarButtons: toolboxSections, onInteraction } = useToolbar({
    servicesManager,
    buttonSection: buttonSectionId,
  });

  if (!toolboxSections.length) {
    return null;
  }

  // Ensure we have proper button sections at the top level.
  if (!toolboxSections.every(section => section.componentProps.buttonSection)) {
    throw new Error(
      'Toolbox accepts only button sections at the top level, not buttons. Create at least one button section.'
    );
  }

  // Helper to check a list of buttons for an active tool.
  const findActiveOptions = (buttons: any[]): unknown => {
    for (const tool of buttons) {
      if (tool.componentProps.isActive) {
        return tool.componentProps.options;
      }
      if (tool.componentProps.buttonSection) {
        const nestedButtons = toolbarService.getButtonPropsInButtonSection(
          tool.componentProps.buttonSection
        ) as ButtonProps[];
        const activeNested = nestedButtons.find(nested => nested.isActive);
        if (activeNested) {
          return activeNested.options;
        }
      }
    }
    return null;
  };

  // Look for active tool options across all sections.
  const activeToolOptions = toolboxSections.reduce((activeOptions, section) => {
    if (activeOptions) {
      return activeOptions;
    }
    const sectionId = section.componentProps.buttonSection;
    const buttons = toolbarService.getButtonSection(sectionId);
    return findActiveOptions(buttons);
  }, null);

  // Define the interaction handler once.
  const handleInteraction = ({ itemId }: { itemId: string }) => {
    onInteraction?.({ itemId });
  };

  return (
    <PanelSection>
      <PanelSection.Header>
        <span>{title}</span>
      </PanelSection.Header>
      <PanelSection.Content className="flex-shrink-0 border-none">
        {toolboxSections.map(section => {
          const sectionId = section.componentProps.buttonSection;
          const buttons = toolbarService.getButtonSection(sectionId) as any[];

          return (
            <div
              key={sectionId}
              className="bg-muted flex flex-wrap space-x-2 py-2 px-1"
            >
              {buttons.map(tool => {
                if (!tool) {
                  return null;
                }
                const { id, Component, componentProps } = tool;

                return (
                  <div
                    key={id}
                    className={classnames('ml-1')}
                  >
                    <Component
                      {...componentProps}
                      id={id}
                      onInteraction={handleInteraction}
                      size="toolbox"
                      servicesManager={servicesManager}
                    />
                  </div>
                );
              })}
            </div>
          );
        })}
        {activeToolOptions && (
          <div className="bg-primary-dark h-auto px-2">
            <ToolSettings options={activeToolOptions} />
          </div>
        )}
      </PanelSection.Content>
    </PanelSection>
  );
}