jonahoffline/filepreviews-ruby

# encoding: utf-8
require 'filepreviews/version'
require 'filepreviews/config'
require 'filepreviews/utils'
require 'filepreviews/http'
require 'filepreviews/response'
require 'ostruct'


# @author Jonah Ruiz <jonah@pixelhipsters.com>
# Main module for FilePreviews.io library
module Filepreviews
  include Filepreviews::Config
  include Filepreviews::Utils

  # Facade method to call API response
  # @param url [String] image url to convert
  # @param options [Hash<Symbol>] :metada and :image options
  # @return [Filepreviews::Response] api response object
  def self.generate(url, options = {})
    request_hash = prepare_options(url, options)
    Filepreviews::HTTP.fetch(request_hash)
  end

  protected

  # Prepares url and parameters for request
  #  it calls defaults if nothing is provided
  # @param url [String] url
  # @param params [Hash<symbol>] options
  # @return [OpenStruct] all options as methods
  def self.prepare_options(url, params)
    params = merge_options(params.fetch(:options) { default_options })
    params.merge!(url: url)
    OpenStruct.new(params)
  end

  # Default options to be used in API request
  # @return [Hash<symbol>] default options
  def self.default_options
    { debug: false, pages: '1' }
  end

  # Merges metadata options with supported formats
  # @param options [Hash<symbol>] metadata and optional size
  def self.merge_options(options)
    options.delete(:metadata) if options[:metadata] && options[:metadata].empty?

    if metadata_formats.include?(options[:metadata])
      options.store(:metadata, options[:metadata])
    end

    image = (options.fetch(:format) if image_formats.include?(options[:format]))
    options.store(:format, image)

    pages = (options.fetch(:pages, '1'))
    options.store(:pages, validate_pages(pages))

    default_options.merge(options)
  end

  # Supported (image) formats in metadata
  # @return [Array] image file extensions
  def self.metadata_formats
    %w(exif ocr psd checksum multimedia)
  end

  # Supported extracted (image) thumbnail formats
  # @return [Array] thumbnail image file extensions
  def self.image_formats
    %w(jpg jpeg png)
  end
end