/**
 * Copyright (c) OpenLens Authors. All rights reserved.
 * Licensed under MIT License. See LICENSE in root directory for more information.
 */
import type { Injectable } from "@ogre-tools/injectable";
import { getInjectable } from "@ogre-tools/injectable";
import type { IComputedValue } from "mobx";
import { computed } from "mobx";
import { extensionRegistratorInjectionToken } from "../../../extensions/extension-loader/extension-registrator-injection-token";
import type { LensRendererExtension } from "../../../extensions/lens-renderer-extension";
import type { StatusBarItem } from "./status-bar-item-injection-token";
import { statusBarItemInjectionToken } from "./status-bar-item-injection-token";
import type { StatusBarRegistration } from "./status-bar-registration";
import React from "react";
import getRandomIdInjectable from "../../../common/utils/get-random-id.injectable";
import loggerInjectable from "../../../common/logger.injectable";
import type { Logger } from "../../../common/logger";

const statusBarItemRegistratorInjectable = getInjectable({
  id: "status-bar-item-registrator",

  instantiate: (di) => (extension) => {
    const rendererExtension = extension as LensRendererExtension;
    const getRandomId = di.inject(getRandomIdInjectable);
    const logger = di.inject(loggerInjectable);

    return rendererExtension.statusBarItems.flatMap(
      toItemInjectableFor(rendererExtension, getRandomId, logger),
    );
  },

  injectionToken: extensionRegistratorInjectionToken,
});

export default statusBarItemRegistratorInjectable;

const toItemInjectableFor = (extension: LensRendererExtension, getRandomId: () => string, logger: Logger) => {
  return (registration: StatusBarRegistration): Injectable<StatusBarItem, StatusBarItem, void>[] => {
    const id = `${getRandomId()}-status-bar-item-for-extension-${extension.sanitizedExtensionId}`;
    let component: React.ComponentType;
    let position: "left" | "right";
    const visible: IComputedValue<boolean> | undefined = registration?.visible;

    if (registration?.item) {
      const { item } = registration;

      position = "right";
      component =
        () => (
          <>
            {
              typeof item === "function"
                ? item()
                : item
            }
          </>
        );
    } else if (registration?.components) {
      const { position: pos = "right", Item } = registration.components;

      if (pos !== "left" && pos !== "right") {
        throw new TypeError("StatusBarRegistration.components.position must be either 'right' or 'left'");
      }

      position = pos;
      component = Item;
    } else {
      logger.warn("StatusBarRegistration must have valid item or components field");

      return [];
    }

    return [getInjectable({
      id,

      instantiate: () => ({
        origin: extension.sanitizedExtensionId,
        component,
        position,
        visible: visible ?? computed(() => true),
      }),

      injectionToken: statusBarItemInjectionToken,
    })];
  };
};