import { withPluginApi } from "discourse/lib/plugin-api";
import discourseComputed from "discourse-common/utils/decorators";
import User from "discourse/models/user";
import EmberObject from "@ember/object";
import { ajax } from "discourse/lib/ajax";

export default {
  name: "user-card-directory",
  initialize(container) {
    withPluginApi("0.8.7", (api) => {
      api.modifyClass("route:users", {
        resetController(controller, isExiting) {
          this._super(...arguments);
          if (isExiting) {
            controller.set("cachedUserCardInfo", {});
          }
        },
      });

      api.modifyClass("route:users", {
        queryParams: {
          cards: { refreshModel: true },
        },

        beforeModel(transition) {
          this._super(transition);
          if (
            settings.default_view === "cards" &&
            !transition.to.queryParams.cards
          ) {
            this.transitionTo({ queryParams: { cards: "yes" } });
          }
        },

        model(params) {
          return this._super(params).then((model) => {
            model.showAsCards = params["cards"] === "yes";
            return model;
          });
        },

        renderTemplate(controller, model) {
          if (model.showAsCards) {
            return this.render("users-as-card-directory");
          }
          return this._super();
        },
      });

      api.modifyClass("controller:users", {
        cachedUserCardInfo: null,

        init(){
          this.set("cachedUserCardInfo", {});
          this._super(...arguments);
        },

        @discourseComputed("model.content.@each")
        userCards(allUsers) {
          if (!allUsers) return [];
          const toLoad = [];
          if (settings.hide_current_user && this.currentUser) {
            allUsers = allUsers.filter((u) => u.id !== this.currentUser.id);
          }
          const userCardInfos = allUsers.map(u => {
            if (this.cachedUserCardInfo[u.id]) {
              return this.cachedUserCardInfo[u.id];
            }

            const userCardInfo = (this.cachedUserCardInfo[
              u.id
            ] = EmberObject.create({
              user: User.create(u.user),
              directoryItem: u,
              loading: true
            }));

            toLoad.push(userCardInfo);

            return userCardInfo;
          });

          const loadMax = 50;

          while (toLoad.length > 0) {
            const thisBatch = toLoad.splice(0, loadMax);
            const promise = ajax("/user-cards.json", {
              data: { user_ids: thisBatch.map(uc => uc.user.id).join(",") }
            });
            thisBatch.forEach(uc => {
              // Each user card expects its own promise
              // Rather than making a separate AJAX request for each
              // We re-use the `user-cards.json` promise, and manipulate the data
              const convertedPromise = promise.then(data => {
                // Find the correct user from users, and put it in the user attribute
                // Use Object.assign to avoid contaminating the source object
                return Object.assign({}, data, {
                  user: data.users.find(u => u.id === uc.user.id)
                });
              });
              return uc.user
                .findDetails({ existingRequest: convertedPromise })
                .finally(() => uc.set("loading", false));
            });
          }

          return userCardInfos;
        }
      });
    });
  }
};