docbrown/app/controllers/chat_channel_memberships_controller.rb

class ChatChannelMembershipsController < ApplicationController
  after_action :verify_authorized, except: :join_channel
  include MessagesHelper

  rescue_from Pundit::NotAuthorizedError, with: :user_not_authorized
  rescue_from ActiveRecord::RecordNotFound, with: :record_not_found

  def index
    skip_authorization
    @pending_invites = current_user.chat_channel_memberships.includes(:chat_channel).where(status: "pending")
  end

  def find_by_chat_channel_id
    @membership = ChatChannelMembership.where(chat_channel_id: params[:chat_channel_id], user_id: current_user.id).first!
    authorize @membership
    render json: @membership.to_json(
      only: %i[id status viewable_by chat_channel_id last_opened_at],
      methods: %i[channel_text channel_last_message_at channel_status channel_username
                  channel_type channel_text channel_name channel_image channel_modified_slug channel_messages_count],
    )
  end

  def chat_channel_info
    @membership = ChatChannelMembership.find(params[:id])
    authorize @membership
    @channel = @membership.chat_channel
    data = ChatChannelDetailPresenter.new(@channel, @membership).as_json

    render json: { success: true, result: data, message: "" }, success: :ok
  end

  def create_membership_request
    chat_channel = ChatChannel.find_by(id: channel_membership_request_params[:chat_channel_id])
    authorize chat_channel, :update?
    usernames = channel_membership_request_params[:invitation_usernames].split(",").map { |username| username.strip.delete("@") }
    users = User.where(username: usernames)
    invitations_sent = chat_channel.invite_users(users: users, membership_role: "member", inviter: current_user)
    message = if invitations_sent.zero?
                "No invitations sent. Check for username typos."
              else
                "#{invitations_sent} #{'invitation'.pluralize(invitations_sent)} sent."
              end

    render json: { success: true, message: message, data: {} }, status: :ok
  end

  def join_channel
    membership_params = params[:chat_channel_membership]
    chat_channel = ChatChannel.find(membership_params[:chat_channel_id])
    existing_membership = ChatChannelMembership.find_by(user_id: current_user.id, chat_channel_id: chat_channel.id)
    if existing_membership.present? && %w[active joining_request].exclude?(existing_membership.status)
      status = existing_membership.update(status: "joining_request", role: "member")
    else
      membership = ChatChannelMembership.new(user_id: current_user.id, chat_channel_id: chat_channel.id, role: "member", status: "joining_request")
      status = membership.save
    end
    if status
      render json: { status: "success", message: "Request Sent" }, status: :ok
    else
      render json: { status: 400, message: "Unable to join channel" }, status: :bad_request
    end
  end

  def remove_membership
    @chat_channel = ChatChannel.find(params[:chat_channel_id])
    authorize @chat_channel, :update?
    @chat_channel_membership = @chat_channel.chat_channel_memberships.find(params[:membership_id])
    if params[:status] == "pending"
      @chat_channel_membership.destroy
      message = "Invitation removed."
    else
      send_chat_action_message("@#{current_user.username} removed @#{@chat_channel_membership.user.username} from #{@chat_channel_membership.channel_name}", current_user, @chat_channel_membership.chat_channel_id, "removed_from_channel")
      @chat_channel_membership.update(status: "removed_from_channel")
      message = "Removed #{@chat_channel_membership.user.name}"
    end

    render json: { status: "success", message: message, success: true }, status: :ok
  end

  def add_membership
    @chat_channel = ChatChannel.find(params[:chat_channel_id])
    authorize @chat_channel, :update?
    @chat_channel_membership = @chat_channel.chat_channel_memberships.find(params[:membership_id])
    respond_to_invitation(@chat_channel_membership.status) if permitted_params[:user_action].present? && @chat_channel_membership.status == "joining_request"
  end

  def update
    @chat_channel_membership = ChatChannelMembership.find(params[:id])
    authorize @chat_channel_membership
    respond_to_invitation(@chat_channel_membership.status)
  end

  def update_membership
    @chat_channel_membership = ChatChannelMembership.find(params[:id])
    authorize @chat_channel_membership
    @chat_channel_membership.update(permitted_params)
    if @chat_channel_membership.errors.any?
      render json: { success: false, errors: @chat_channel_membership.errors.full_messages, message: "Failed to update settings." }, status: :bad_request
    else
      render json: { success: true, message: "Personal settings updated." }, status: :ok
    end
  end

  def leave_membership
    chat_channel_membership = ChatChannelMembership.find_by(id: params[:id])
    authorize chat_channel_membership
    channel_name = chat_channel_membership.chat_channel.channel_name
    send_chat_action_message("@#{current_user.username} left #{chat_channel_membership.channel_name}", current_user, chat_channel_membership.chat_channel_id, "left_channel")
    chat_channel_membership.update(status: "left_channel")
    message = "You have left the channel #{channel_name}. It may take a moment to be removed from your list."
    if chat_channel_membership.errors.any?
      render json: { success: false, message: "Failed to update membership", errors: chat_channel_membership.errors.full_messages }, status: :bad_request
    else
      render json: { success: true, message: message },  status: :ok
    end
  end

  private

  def permitted_params
    params.require(:chat_channel_membership).permit(:user_action, :show_global_badge_notification)
  end

  def channel_membership_request_params
    params.require(:chat_channel_membership).permit(:chat_channel_id, :invitation_usernames)
  end

  def respond_to_invitation(previous_status)
    if permitted_params[:user_action] == "accept"
      @chat_channel_membership.update(status: "active")
      channel_name = @chat_channel_membership.chat_channel.channel_name
      if previous_status == "pending"
        send_chat_action_message(
          "@#{current_user.username} joined #{@chat_channel_membership.channel_name}",
          current_user,
          @chat_channel_membership.chat_channel_id,
          "joined",
        )
        flash[:settings_notice] = "Invitation to #{channel_name} accepted. It may take a moment to show up in your list."
      else
        send_chat_action_message(
          "@#{current_user.username} added @#{@chat_channel_membership.user.username}",
          current_user,
          @chat_channel_membership.chat_channel_id,
          "joined",
        )

        NotifyMailer.
          with(membership: @chat_channel_membership, inviter: @chat_channel_membership.user).
          channel_invite_email.
          deliver_later

        flash[:settings_notice] = "Accepted request of #{@chat_channel_membership.user.username} to join #{channel_name}."
      end
    else
      @chat_channel_membership.update(status: "rejected")
      flash[:settings_notice] = "Invitation rejected."
    end

    membership_user = MembershipUserPresenter.new(@chat_channel_membership).as_json

    respond_to do |format|
      format.html { redirect_to chat_channel_memberships_path }
      format.json do
        render json: {
          status: "success",
          message: flash[:settings_notice],
          success: true,
          membership: membership_user
        }, status: :ok
      end
    end
  end

  def send_chat_action_message(message, user, channel_id, action)
    temp_message_id = (0...20).map { ("a".."z").to_a[rand(8)] }.join
    message = Message.create("message_markdown" => message, "user_id" => user.id, "chat_channel_id" => channel_id, "chat_action" => action)
    pusher_message_created(false, message, temp_message_id)
  end

  def user_not_authorized
    render json: { success: false, message: "User not authorized" }, status: :unauthorized
  end

  def record_not_found
    render json: { success: false, message: "not found" }, status: :not_found
  end
end