require 'process_spec_helper'
require 'support/heredoc_helper'

RSpec.describe CLOCScanner, type: :process do
  describe "#scan" do
    it "returns a CLOC object when cloc is successful" do
      stub_dir_exists
      cloc_output = <<-EOS.heredoc_unindent
        files,language,blank,comment,code,"github.com/AlDanial/cloc v 1.70  T=0.29 s (290.6 files/s, 66866.8 lines/s)"
        20,PHP,4571,0,6641
        2,JSON,0,0,1770
        1,JavaScript,260,184,1263
      EOS
      system_cloc = fake_system_cloc(result: cloc_output, process_status: successful_process_status)
      expect(CLOCScanner.new(system_cloc).scan("my_directory")).to be_a(CLOC)
    end

    # EXCEPTION HANDLING:
    #####################

    it "raises an error when no directory is passed" do
      expect{ CLOCScanner.new(fake_system_cloc).scan(nil) }.to raise_error CLOCScanner::ArgumentError
    end

    it "raises an error when the directory doesn't exist" do
      allow(Dir).to receive(:exist?).and_return false
      expect{ CLOCScanner.new(fake_system_cloc).scan("my_directory") }.to raise_error CLOCScanner::NoDirectory
    end

    it "raises an error when cloc was not available" do
      stub_dir_exists
      system_cloc = fake_system_cloc(which_result: which_failure)
      expect{ CLOCScanner.new(system_cloc).scan("my_directory") }.to raise_error CLOCScanner::Unavailable
    end

    it 'raises an error when cloc returns an unrecognised error' do
      stub_dir_exists
      system_cloc = fake_system_cloc(result: "Some nonsense", process_status: failed_process_status)
      expect{ CLOCScanner.new(system_cloc).scan("my_directory") }.to raise_error CLOCScanner::Exception
    end

    it 'raises an error when the output could not be parsed' do
      stub_dir_exists
      cloc_output = <<-EOS.heredoc_unindent
        files,language,blank,comment,code,"github.com/AlDanial/cloc v 1.70  T=0.29 s (290.6 files/s, 66866.8 lines/s)"
        20",PHP,4571,0,6641
      EOS
      system_cloc = fake_system_cloc(result: cloc_output)
      expect{ CLOCScanner.new(system_cloc).scan("my_directory") }.to raise_error CLOCScanner::CSVError
    end

    def fake_system_cloc(result: "foo", process_status: successful_process_status, which_result: which_success('cloc'))
      instance_double(
        SystemCloc,
        call: [result, process_status],
        which: which_result
      )
    end

    def stub_dir_exists
      allow(Dir).to receive(:exist?).and_return true
    end
  end
end