class VendingMachine
  attr_reader :balance

  def initialize(items = nil)
    @inventory = []
    if items.is_a?(Array)
      items.each do |item|
        if item.is_a?(Hash) &&
           item[:name].is_a?(String) &&
           item[:price].is_a?(Numeric) &&
           item[:quantity].is_a?(Integer)
          @inventory << {
            name: item[:name],
            price: item[:price].to_f,
            quantity: item[:quantity]
          }
        end
      end
    end
    @balance = 0.0
  end

  def insert_money(amount)
    return unless amount.is_a?(Numeric) && amount > 0
    @balance += amount.to_f
  end

  def return_change
    change = @balance
    @balance = 0.0
    change
  end

  def select_item(name)
    return 'Item not found' unless name.is_a?(String) && !name.empty?
    item = @inventory.find { |i| i[:name] == name }
    return 'Item not found' if item.nil?
    return 'Item out of stock' if item[:quantity] == 0
    return 'Insufficient funds. Please insert more money.' if @balance < item[:price]
    @balance -= item[:price]
    item[:quantity] -= 1
    "Dispensed #{name}"
  end

  def check_stock(name)
    return 0 unless name.is_a?(String) && !name.empty?
    item = @inventory.find { |i| i[:name] == name }
    item ? item[:quantity] : 0
  end

  def restock(name, qty)
    return unless name.is_a?(String) && !name.empty? && qty.is_a?(Integer) && qty > 0
    item = @inventory.find { |i| i[:name] == name }
    if item
      item[:quantity] += qty
    else
      @inventory << { name: name, price: 1.25, quantity: qty }
    end
  end

  def get_available_items
    @inventory.select { |i| i[:quantity] > 0 }
  end
end