class AwsRecord::Generators::Base

def ensure_hkey
  uuid_member = nil
  hkey_member = nil
  rkey_member = nil
  self.attributes.each do |attr|
    if attr.options.key? :hash_key
      if hkey_member
        @parse_errors << ArgumentError.new("Redefinition of hash_key attr: #{attr.name}, original declaration of hash_key on: #{hkey_member.name}")
        next
      end
      hkey_member = attr
    elsif attr.options.key? :range_key
      if rkey_member
        @parse_errors << ArgumentError.new("Redefinition of range_key attr: #{attr.name}, original declaration of range_key on: #{hkey_member.name}")
        next
      end
      rkey_member = attr
    end
    if attr.name.include? "uuid"
      uuid_member = attr
    end
  end
  if !hkey_member
    if uuid_member
      uuid_member.options[:hash_key] = true
    else
      self.attributes.unshift GeneratedAttribute.parse("uuid:hkey")
    end
  end
end

def ensure_unique_fields
  used_names = Set.new
  duplicate_fields = []
  self.attributes.each do |attr|
    if used_names.include? attr.name
      duplicate_fields << [:attribute, attr.name]
    end
    used_names.add attr.name
    if attr.options.key? :database_attribute_name
      raw_db_attr_name = attr.options[:database_attribute_name].delete('"') # db attribute names are wrapped with " to make template generation easier
      if used_names.include? raw_db_attr_name
        duplicate_fields << [:database_attribute_name, raw_db_attr_name]
      end
      used_names.add raw_db_attr_name
    end
  end
  if !duplicate_fields.empty?
    duplicate_fields.each do |invalid_attr|
      @parse_errors << ArgumentError.new("Found duplicated field name: #{invalid_attr[1]}, in attribute#{invalid_attr[0]}")
    end
  end
end

def has_validations?
  !@required_attrs.empty? || !@length_validations.empty?
end

def initialize(args, *options)
  options[0] << "--skip-table-config" if options[1][:behavior] == :revoke
  @parse_errors = []
  super
  ensure_unique_fields
  ensure_hkey
  parse_gsis!
  parse_table_config!
  parse_validations!
  if !@parse_errors.empty?
    STDERR.puts "The following errors were encountered while trying to parse the given attributes"
    STDERR.puts
    STDERR.puts @parse_errors
    STDERR.puts
    abort("Please fix the errors before proceeding.")
  end
end

def mutation_tracking_disabled?
  options['disable_mutation_tracking']
end

def parse_attributes!
  self.attributes = (attributes || []).map do |attr|
    begin
      GeneratedAttribute.parse(attr)
    rescue ArgumentError => e
      @parse_errors << e
      next
    end
  end
  self.attributes = self.attributes.compact
  if options['password_digest']
    self.attributes << GeneratedAttribute.new("password_digest", :string_attr, :digest => true)
  end
  if options['timestamps']
    self.attributes << GeneratedAttribute.parse("created:datetime:default_value{Time.now}")
    self.attributes << GeneratedAttribute.parse("updated:datetime:default_value{Time.now}")
  end
end

def parse_gsis!
  @gsis = (options['gsi'] || []).map do |raw_idx|
    begin
      idx = SecondaryIndex.parse(raw_idx)
      attributes = self.attributes.select { |attr| attr.name == idx.hash_key}
      if attributes.empty?
        @parse_errors << ArgumentError.new("Could not find attribute #{idx.hash_key} for gsi #{idx.name} hkey")
        next
      end
      if idx.range_key
        attributes = self.attributes.select { |attr| attr.name == idx.range_key}
        if attributes.empty?
          @parse_errors << ArgumentError.new("Could not find attribute #{idx.range_key} for gsi #{idx.name} rkey")
          next
        end
      end
      idx
    rescue ArgumentError => e
      @parse_errors << e
      next
    end
  end
  @gsis = @gsis.compact
end

def parse_rw_units(name)
  if !options['table_config'].key? name
    @parse_errors << ArgumentError.new("Please provide a table_config definition for #{name}")
  else
    rw_units = options['table_config'][name]
    return rw_units.gsub(/[,.-]/, ':').split(':').reject { |s| s.empty? }
  end
end

def parse_table_config!
  return unless options['table_config']
  @primary_read_units, @primary_write_units = parse_rw_units("primary")
  @gsi_rw_units = @gsis.map { |idx|
    [idx.name, parse_rw_units(idx.name)]
  }.to_h
  options['table_config'].each do |config, rw_units|
    if config == "primary"
      next
    else
      gsi = @gsis.select { |idx| idx.name == config}
      if gsi.empty?
        @parse_errors << ArgumentError.new("Could not find a gsi declaration for #{config}")
      end
    end
  end
end

def parse_validations!
  @required_attrs = options['required'] ? options['required'].split(',') : []
  @required_attrs.each do |val_attr|
    @parse_errors << ArgumentError.new("No such field #{val_attr} in required validations") if !self.attributes.any? { |attr| attr.name == val_attr }
  end
  @length_validations = options['length_validations'].map do |val_attr, bounds|
    @parse_errors << ArgumentError.new("No such field #{val_attr} in required validations") if !self.attributes.any? { |attr| attr.name == val_attr }
    bounds = bounds.gsub(/[,.-]/, ':').split(':').reject { |s| s.empty? }
    [val_attr, "#{bounds[0]}..#{bounds[1]}"]
  end
  @length_validations = @length_validations.to_h
end