#!/usr/bin/env ruby

# Push a job onto the Delayed Job queue without booting the Rails stack
# Perfect for calling via cron.
#
# Use like this:
#
#   ./script/enqueue <JobClassName>
#   ./script/enqueue Background::ImportJobs

require 'erb'
require 'yaml'

ENV["RAILS_ENV"] ||= "development"

DATABASE_CONFIG = File.expand_path("../../config/database.yml", __FILE__)

def psql
  raise "Missing database.yml" unless File.exists?(DATABASE_CONFIG)

  file   = File.read(DATABASE_CONFIG)
  erb    = ERB.new(file).result
  env    = ENV["RAILS_ENV"]
  config = YAML.load(erb)[env]

  raise "Missing config for #{env} environment" unless config

  "psql".tap do |s|
    s << " --quiet"
    s << " --host #{config['host']}"     if config['host']
    s << " --user #{config['username']}" if config['username']
    s << " --port #{config['port']}"     if config['port']
    s << " #{config['database']}"
  end
end

def enqueue_delayed_job(handler, priority=nil)
  time = Time.now.utc.strftime("%Y-%m-%d %H:%M:%S")
  priority ||= 50

  sql = <<-SQL
    INSERT INTO delayed_jobs (
      handler,
      created_at,
      updated_at,
      run_at,
      priority
    ) VALUES (
      '--- !ruby/object:#{handler} {}\n',
      '#{time}',
      '#{time}',
      '#{time}',
      #{priority}
    );
  SQL

  IO.popen(psql, "w") do |io|
    io.write sql
  end
end

enqueue_delayed_job ARGV[0], ARGV[1]