class SeedGenerator < ApplicationRecord
  # Generate ID for Tables
  def self.generate_id(model, prefix)
    seed = SeedGenerator.find_by_model(model)    
    new_receipt_no = 0

    if (seed.nil?)
      seed = SeedGenerator.new()
      seed.model = model
      new_receipt_no = seed.next
      seed.save
    else
      next_no = seed.next
      current_no = seed.next
      seed.next = seed.next + seed.increase_by
      seed.current = current_no
      seed.save
      # cur_val, next_val = self.update_seed(model, seed.next, seed.increase_by)   

      # if next_no == cur_val   
      #   puts "SSS"
      #   puts next_val             
      #   cur_val2, next_val2 = self.update_seed(model, next_val, seed.increase_by)
      #   puts next_val2
      #   padding_len = 15 - prefix.length
      #   saleOrderId = prefix +"-"+ cur_val2.to_s.to_s.rjust((14-prefix.length)+1,'0')
      #   puts saleOrderId
      #   return saleOrderId 
      # end 
        
      # padding_len = 15 - prefix.length
      # saleOrderId = prefix +"-"+ cur_val.to_s.to_s.rjust((14-prefix.length)+1,'0')
      # return saleOrderId 

    end

    padding_len = 15 - prefix.length
    saleOrderId = prefix +"-"+ seed.current.to_s.to_s.rjust((14-prefix.length)+1,'0')
    return saleOrderId
  end

  # Generate Receipt No
  def self.new_receipt_no
    seed = SeedGenerator.find_by_model("sale")
    new_receipt_no = 0
    if (seed.nil?)
      seed = SeedGenerator.new()
      seed.model = "sale"
      new_receipt_no = seed.next
      seed.save

    else
      current_no = seed.next
      seed.next = seed.next
      seed.current = current_no
      seed.save
    end

    return seed.current
  end

  # Generate for 4 digit Code
  def self.generate_code(model, prefix)
    seed = SeedGenerator.find_by_model(model)
    new_code = 0

    if (seed.nil?)
      seed = SeedGenerator.new()
      seed.model = model
      new_code = seed.next
      seed.save
    else
      current_no = seed.next
      seed.next = seed.next + seed.increase_by
      seed.current = current_no
      seed.save
    end

    
    if prefix.length == 1
      padding_len = 5 - prefix.length
      count = 4-prefix.length
    else prefix.length == 2
      padding_len = 6 - prefix.length
      count = 5-prefix.length
    end
    next_code = prefix + seed.current.to_s.to_s.rjust((count)+1,'0')    
    return next_code
  end

  def self.update_seed(model, current, inc)    
    cur_val = 0
    next_val = 0
    nex = current + inc

    update_sql = "update seed_generators set current= #{current}, next= #{nex} where model='#{model}';";
    select_sql = "select * from seed_generators where model='#{model}';"
    update_result = ActiveRecord::Base.connection.execute(update_sql);

    select_result = ActiveRecord::Base.connection.execute(select_sql);
    
    select_result.each do |row|      
      cur_val = row [3]
      next_val = row[4]
    end

    return cur_val, next_val
  end
end