# frozen_string_literal: true

module Deployments
  class CreateService
    attr_reader :environment, :current_user, :params

    def initialize(environment, current_user, params)
      @environment = environment
      @current_user = current_user
      @params = params
    end

    def execute
      return last_deployment if last_deployment&.equal_to?(params)

      environment.deployments.build(deployment_attributes).tap do |deployment|
        # Deployment#change_status already saves the model, so we only need to
        # call #save ourselves if no status is provided.
        if (status = params[:status])
          deployment.update_status(status)
        else
          deployment.save
        end
      end
    end

    def deployment_attributes
      # We use explicit parameters here so we never by accident allow parameters
      # to be set that one should not be able to set (e.g. the row ID).
      {
        project_id: environment.project_id,
        environment_id: environment.id,
        ref: params[:ref],
        tag: params[:tag],
        sha: params[:sha],
        user: current_user,
        on_stop: params[:on_stop]
      }
    end

    private

    def last_deployment
      @environment.last_deployment
    end
  end
end