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

    acts_as_paranoid

    belongs_to :project
    belongs_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_now
      if next_time.present?
        update!(next_run_at: next_time)
      end
    end

    private

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

      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 (cron_parser.next_time_from_now - Time.now).abs < 1.hour
        self.errors.add(:cron, " can not be less than 1 hour")
      end
    end

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