require 'zip'
require 'exifr/jpeg'
require 'fileutils'

module Fotos
  class ZipExtractor
    def initialize(options)
      @zip_file_path = options[:zip]
      @destination_path = options[:dest]
      @tmp_dir_path = File.join(Pathname.pwd, 'tmp')
      @extracted_paths = []
      @copied_paths = []
    end

    attr_reader :zip_file_path, :destination_path

    def call
      Dir.mkdir(@tmp_dir_path) unless Dir.exist?(@tmp_dir_path)
      extract
      copy
    ensure
      FileUtils.rm_r(@tmp_dir_path)
    end

    private
    def extract
      Zip::File.open(zip_file_path) do |zip_file|
        zip_file.each do |entry|
          file_name = entry.name.split('/').last
          dest_path = File.join(@tmp_dir_path, file_name)
          @extracted_paths << dest_path
          entry.extract(dest_path)
        rescue Zip::DestinationFileExistsError
          next
        end
      end
    end

    def copy
      date_format = '%d-%m-%Y'
      @copied_paths = @extracted_paths.map do |fp|
        file_name = File.basename(fp)
        puts "looking at #{file_name}"
        exif = EXIFR::JPEG.new(fp)

        # get date from file's exif data
        exif_date_str = exif.date_time.strftime(date_format)

        # destination dir for given file in public/images/dd-mm-yyyy
        dest_dir = File.join(Pathname.pwd, destination_path, exif_date_str)
        dest_path = File.join(dest_dir, File.basename(fp))

        # create destination dir if not already there
        FileUtils.mkdir_p(dest_dir) unless Dir.exist?(dest_dir)
        puts "#{file_name} --> #{dest_path}"
        FileUtils.cp(fp, dest_path)
        dest_path
      end
    end

    def generate_thumbnails
      @copied_paths.map do |fp|
        Thumbnail.new(fp).create
      end
    end
  end
end