require "spec_helper"

describe "Missing Attachment Styles" do
  before do
    Paperclip::AttachmentRegistry.clear
  end

  after do
    begin
      File.unlink(Paperclip.registered_attachments_styles_path)
    rescue StandardError
      nil
    end
  end

  it "enables to get and set path to registered styles file" do
    assert_equal ROOT.join("tmp/public/system/paperclip_attachments.yml").to_s, Paperclip.registered_attachments_styles_path
    Paperclip.registered_attachments_styles_path = "/tmp/config/paperclip_attachments.yml"
    assert_equal "/tmp/config/paperclip_attachments.yml", Paperclip.registered_attachments_styles_path
    Paperclip.registered_attachments_styles_path = nil
    assert_equal ROOT.join("tmp/public/system/paperclip_attachments.yml").to_s, Paperclip.registered_attachments_styles_path
  end

  it "is able to get current attachment styles" do
    assert_equal Hash.new, Paperclip.send(:current_attachments_styles)
    rebuild_model styles: { croppable: "600x600>", big: "1000x1000>" }
    expected_hash = { Dummy: { avatar: [:big, :croppable] } }
    assert_equal expected_hash, Paperclip.send(:current_attachments_styles)
  end

  it "is able to save current attachment styles for further comparison" do
    rebuild_model styles: { croppable: "600x600>", big: "1000x1000>" }
    Paperclip.save_current_attachments_styles!
    expected_hash = { Dummy: { avatar: [:big, :croppable] } }
    assert_equal expected_hash, YAML.load_file(Paperclip.registered_attachments_styles_path)
  end

  it "is able to read registered attachment styles from file" do
    rebuild_model styles: { croppable: "600x600>", big: "1000x1000>" }
    Paperclip.save_current_attachments_styles!
    expected_hash = { Dummy: { avatar: [:big, :croppable] } }
    assert_equal expected_hash, Paperclip.send(:get_registered_attachments_styles)
  end

  it "is able to calculate differences between registered styles and current styles" do
    rebuild_model styles: { croppable: "600x600>", big: "1000x1000>" }
    Paperclip.save_current_attachments_styles!
    rebuild_model styles: { thumb: "x100", export: "x400>", croppable: "600x600>", big: "1000x1000>" }
    expected_hash = { Dummy: { avatar: [:export, :thumb] } }
    assert_equal expected_hash, Paperclip.missing_attachments_styles

    ActiveRecord::Base.connection.create_table :books, force: true
    class ::Book < ActiveRecord::Base
      has_attached_file :cover, styles: { small: "x100", large: "1000x1000>" }
      has_attached_file :sample, styles: { thumb: "x100" }
    end

    expected_hash = {
      Dummy: { avatar: [:export, :thumb] },
      Book: { sample: [:thumb], cover: [:large, :small] }
    }
    assert_equal expected_hash, Paperclip.missing_attachments_styles
    Paperclip.save_current_attachments_styles!
    assert_equal Hash.new, Paperclip.missing_attachments_styles
  end

  it "is able to calculate differences when a new attachment is added to a model" do
    rebuild_model styles: { croppable: "600x600>", big: "1000x1000>" }
    Paperclip.save_current_attachments_styles!

    class ::Dummy
      has_attached_file :photo, styles: { small: "x100", large: "1000x1000>" }
    end

    expected_hash = {
      Dummy: { photo: [:large, :small] }
    }
    assert_equal expected_hash, Paperclip.missing_attachments_styles
    Paperclip.save_current_attachments_styles!
    assert_equal Hash.new, Paperclip.missing_attachments_styles
  end

  # It's impossible to build styles hash without loading from database whole bunch of records
  it "skips lambda-styles" do
    rebuild_model styles: lambda { |attachment| attachment.instance.other == "a" ? { thumb: "50x50#" } : { large: "400x400" } }
    assert_equal Hash.new, Paperclip.send(:current_attachments_styles)
  end
end