module Ci
  class TriggerSchedule < ActiveRecord::Base
    extend Ci::Model

    acts_as_paranoid

    belongs_to :project
    belongs_to :trigger

    delegate :ref, to: :trigger

    validates :trigger, presence: true
    validates :cron, presence: true
    validates :cron_time_zone, presence: true
    validate :check_cron
    validate :check_ref

    after_create :schedule_next_run!

    def schedule_next_run!
      next_time = Ci::CronParser.new(cron, cron_time_zone).next_time_from(Time.now)

      if next_time.present? && !less_than_1_hour_from_now?(next_time)
        update!(next_run_at: next_time)
      end
    end

    private

    def less_than_1_hour_from_now?(time)
      ((time - Time.now).abs < 1.hour) ? true : false
    end

    def check_cron
      cron_parser = Ci::CronParser.new(cron, cron_time_zone)
      is_valid_cron, is_valid_cron_time_zone = cron_parser.validation
      next_time = cron_parser.next_time_from(Time.now)

      if !is_valid_cron
        self.errors.add(:cron, " is invalid syntax")
      elsif !is_valid_cron_time_zone
        self.errors.add(:cron_time_zone, " is invalid timezone")
      elsif less_than_1_hour_from_now?(next_time)
        self.errors.add(:cron, " can not be less than 1 hour")
      end
    end

    def check_ref
      if !ref.present?
        self.errors.add(:ref, " is empty")
      elsif !project.repository.branch_exists?(ref)
        self.errors.add(:ref, " does not exist")
      end
    end
  end
end