module Api
  module V1
    class InvitationsController < BaseController
      skip_before_action :authenticate_request!, only: :show

      def show
        invitation = find_pending_invitation
        unless invitation
          return render json: { valid: false, error: "Invito non valido o scaduto" }, status: :not_found
        end

        render json: invitation_json(invitation).merge(valid: true)
      end

      def accept
        invitation = find_pending_invitation
        return render json: { error: "Invito non valido o scaduto" }, status: :not_found unless invitation

        email = invitation.email
        if current_user.email.downcase != email.downcase
          return render json: {
            error: "Questo invito è per #{email}. Accedi con quell'indirizzo email.",
            invited_email: email
          }, status: :unprocessable_entity
        end

        invitation.accept!(current_user)
        render json: invitation_json(invitation).merge(message: accept_message(invitation))
      end

      private

      def find_pending_invitation
        token = params[:token].to_s
        return nil if token.blank?

        digest = Digest::SHA256.hexdigest(token)
        TeamInvitation.pending.find_by(token_digest: digest) ||
          TournamentBroadcastInvitation.pending.find_by(token_digest: digest)
      end

      def invitation_json(invitation)
        if invitation.is_a?(TournamentBroadcastInvitation)
          tournament = invitation.tournament
          {
            email: invitation.email,
            tournament_id: tournament.id,
            tournament_name: tournament.name,
            club_name: tournament.club.name,
            team_id: tournament.broadcast_team_id,
            team_name: tournament.name,
            staff_kind: "transmission",
            expires_at: invitation.expires_at
          }
        else
          {
            email: invitation.email,
            team_id: invitation.team_id,
            team_name: invitation.team.name,
            club_name: invitation.team.club.name,
            staff_kind: invitation.staff_kind,
            expires_at: invitation.expires_at
          }
        end
      end

      def accept_message(invitation)
        if invitation.is_a?(TournamentBroadcastInvitation)
          "Sei incaricato delle dirette per #{invitation.tournament.name}."
        else
          "Sei entrato in #{invitation.team.name} come responsabile trasmissione."
        end
      end
    end
  end
end