require 'spec_helper'

describe ChecksummerFile do
  let(:line) { "2010-09-14+10:16:26.4888617110	66	d	/v1/incoming/	" }
  let(:line_with_original_path) { "2010-09-14+10:16:26.4888617110	66	d	/v1/incoming/	/tmp" }
  
  describe "#from_line" do
    before(:each) do
      @file = ChecksummerFile.from_line(line)
    end
    
    it "returns a ChecksummerFile" do
      @file.should be_an_instance_of(ChecksummerFile)
    end
    
    { :modified_at => Time.local(2010, 9, 14, 10, 16, 26), :type => "d", :path => "/v1/incoming" }.each do |key, value|
      it "sets #{key.inspect} to #{value.inspect}" do
        @file.send(key).to_s.should == value.to_s
      end
    end
    
    it "sets original_path to nil when not in response" do
      @file.original_path.should be_nil
    end
    
    it "sets original_path to the path when found in response" do
      ChecksummerFile.from_line(line_with_original_path).original_path.should == "/tmp"
    end
    
    it "calls expans_path on all found paths" do
      File.should_receive(:expand_path).with("/v1/incoming/", )
      File.should_receive(:expand_path).with("/tmp")
      ChecksummerFile.from_line(line_with_original_path)
    end
  end
  
  describe "#checksum_to!" do
    let(:file) { ChecksummerFile.new(:path => "/some/text.csv") }
    let(:time) { Time.local(2010, 9, 10, 11, 12, 13) }
    let(:md5) { "fde8dad8ea43640b00cdd1e92e532ca9" }
    
    before(:each) do
      FileUtils.stub!(:cp).and_return true
      FileUtils.stub!(:mkdir_p)
      FileUtils.stub!(:touch)
      FileUtils.stub(:ln_sf).and_return true
      File.stub!(:exists?).and_return false
      File.stub(:symlink?).and_return false
      File.stub!(:mtime).and_return time
      file.stub!(:md5).and_return md5
    end
    
    it "calls exists with correct parameters" do
      File.should_receive(:exists?).with("/tmp/data/f/d/e/8/fde8dad8ea43640b00cdd1e92e532ca9")
      file.checksum_to!("/tmp/data")
    end
    
    it "calls File.symlink? with the correct parameters" do
      File.should_receive(:symlink?).with("/some/text.csv").and_return false
      file.checksum_to!("/tmp/data")
    end
    
    it "calls md5_path with correct directory" do
      file.should_receive(:md5_path).with("/tmp/data").at_least(1).times.and_return md5
      file.checksum_to!("/tmp/data")
    end
    
    describe "with the file not being checksummed" do
      it "copys the file to it's md5" do
        File.stub!(:exists?).and_return false
        FileUtils.should_receive(:cp).with("/some/text.csv", "/tmp/data/f/d/e/8/fde8dad8ea43640b00cdd1e92e532ca9")
        file.checksum_to!("/tmp/data")
      end

      it "calls FileUtils::mkdir_p with correct path" do
        FileUtils.should_receive(:mkdir_p).with("/tmp/data/f/d/e/8")
        file.checksum_to!("/tmp/data")
      end

      it "creates a symlink for the copied file" do
        FileUtils.should_receive(:ln_sf).with("/tmp/data/f/d/e/8/fde8dad8ea43640b00cdd1e92e532ca9", "/some/text.csv")
        file.checksum_to!("/tmp/data")
      end

      it "returns :copied when copied" do
        file.checksum_to!("/tmp/data").should == :copied
      end
      
      it "changes the mtime of the symlink to the mtime of the original file" do
        FileUtils.should_receive(:touch).with("/some/text.csv", :mtime => time)
        file.checksum_to!("/tmp/data")
      end
    end
    
    describe "with the file being checksummed already" do
      before(:each) do
        File.stub!(:exists?).with("/tmp/data/f/d/e/8/fde8dad8ea43640b00cdd1e92e532ca9").and_return true
      end
      
      it "does not copy the file when already exists" do
        FileUtils.should_not_receive(:cp)
        file.checksum_to!("/tmp/data")
      end

      it "does not call FileUtils::mkdir_p" do
        FileUtils.should_not_receive(:mkdir_p)
        file.checksum_to!("/tmp/data")
      end
      
      it "does symlink the file" do
        FileUtils.should_receive(:ln_sf).with("/tmp/data/f/d/e/8/fde8dad8ea43640b00cdd1e92e532ca9", "/some/text.csv")
        file.checksum_to!("/tmp/data")
      end
      
      it "returns :symlinked" do
        file.checksum_to!("/tmp/data").should == :symlinked
      end
      
      it "changes the mtime of the symlink to the mtime of the original file" do
        FileUtils.should_receive(:touch).with("/some/text.csv", :mtime => time)
        file.checksum_to!("/tmp/data")
      end
    end
    
    describe "with the file being a symlink" do
      before(:each) do
        File.stub(:symlink?).with("/some/text.csv").and_return true
      end
      
      it "does not copy the file when already exists" do
        FileUtils.should_not_receive(:cp)
        file.checksum_to!("/tmp/data")
      end

      it "does not call FileUtils::mkdir_p" do
        FileUtils.should_not_receive(:mkdir_p)
        file.checksum_to!("/tmp/data")
      end
      
      it "does not symlink the file" do
        FileUtils.should_not_receive(:ln_sf)
        file.checksum_to!("/tmp/data")
      end
      
      it "returns :exists" do
        file.checksum_to!("/tmp/data").should == :was_symlink
      end
      
      it "changes the mtime of the symlink to the mtime of the original file" do
        FileUtils.should_not_receive(:touch)
        file.checksum_to!("/tmp/data")
      end
    end
  end
  
  describe "#md5" do
    let(:md5_module) { double("md5 module", :file => "sometest") }
    let(:file) do
      file = ChecksummerFile.new(:path => "/some/path")
      file.stub!(:md5_module).and_return md5_module
      file
    end
    
    
    it "calls md5_module with correct file_path when no md5 set" do
      md5_module.should_receive(:file).with("/some/path")
      file.md5
    end
    
    it "saves the md5 in instance variable" do
      checksum = double("checksum", :to_s => "the checksum")
      md5_module.stub(:file).and_return checksum
      file.md5
      file.instance_variable_get(:@md5).should == "the checksum"
    end
    
    it "returns the instance variable when set" do
      checksum = double("checksum")
      file.instance_variable_set(:@md5, checksum)
      file.md5.should == checksum
    end
  end
  
  describe "#md5_module" do
    it "returns Digest::MD5 for Ruby 1.9" do
      ChecksummerFile.new.md5_module.should == Digest::MD5
    end
  end
  
  describe "#path=" do
    it "sets the correct path" do
      file = ChecksummerFile.new
      file.path = "/some/path"
      file.path.should == "/some/path"
    end
    
    it "resets an existing md5" do
      file = ChecksummerFile.new
      file.instance_variable_set(:@md5, "somemd5")
      file.path = "/some/path"
      file.instance_variable_get(:@md5).should be_nil
    end
  end
end