require 'rails_helper'

describe CopyNamingAlgorithm do
  describe '.create_copy_name' do
    let(:base_name_short) {'b'}
    let(:base_name_short_copy) { 'b_copy-00' }
    let(:base_name_short_copy_1) { 'b_copy-01' }
    let(:base_name_short_copy_2) { 'b_copy-02' }

    let(:base_name_long) {'ten digits'}
    let(:base_name_long_copy) {'te_copy-00'}
    let(:base_name_long_copy_1) {'te_copy-01'}
    let(:base_name_long_copy_2) {'te_copy-02'}


    it 'create copy when none exist already' do
      names = [base_name_short]
      result = TestCopyNamingAlgorithm.new(name_entities:names).create_copy_name(base_name_short)
      expect(result).to eq base_name_short_copy
    end

    it 'create copy when one exists already' do
      names = [base_name_short, base_name_short_copy]
      result = TestCopyNamingAlgorithm.new(name_entities:names).create_copy_name(base_name_short)
      expect(result).to eq base_name_short_copy_1

      result = TestCopyNamingAlgorithm.new(name_entities:names).create_copy_name(base_name_short_copy)
      expect(result).to eq base_name_short_copy_1
    end

    it 'create copy when two exist already' do
      names = [base_name_short, base_name_short_copy, base_name_short_copy_1]

      result = TestCopyNamingAlgorithm.new(name_entities:names).create_copy_name(base_name_short)
      expect(result).to eq base_name_short_copy_2

      result = TestCopyNamingAlgorithm.new(name_entities:names).create_copy_name(base_name_short_copy)
      expect(result).to eq base_name_short_copy_2

      result = TestCopyNamingAlgorithm.new(name_entities:names).create_copy_name(base_name_short_copy_1)
      expect(result).to eq base_name_short_copy_2

    end

    it 'create copy when none exists - longer' do
      names = [base_name_long]
      result = TestCopyNamingAlgorithm.new(name_entities:names).create_copy_name(base_name_long)
      expect(result).to eq base_name_long_copy
    end

    it 'create copy when one exists - longer' do
      names = [base_name_long, base_name_long_copy]
      result = TestCopyNamingAlgorithm.new(name_entities:names).create_copy_name(base_name_long)
      expect(result).to eq base_name_long_copy_1

      result = TestCopyNamingAlgorithm.new(name_entities:names).create_copy_name(base_name_long_copy)
      expect(result).to eq base_name_long_copy_1
    end

    it 'create copy when two exists - longer' do
      names = [base_name_long, base_name_long_copy, base_name_long_copy_1]
      result = TestCopyNamingAlgorithm.new(name_entities:names).create_copy_name(base_name_long)
      expect(result).to eq base_name_long_copy_2

      result = TestCopyNamingAlgorithm.new(name_entities:names).create_copy_name(base_name_long_copy)
      expect(result).to eq base_name_long_copy_2

      result = TestCopyNamingAlgorithm.new(name_entities:names).create_copy_name(base_name_long_copy_1)
      expect(result).to eq base_name_long_copy_2
    end

    it 'raises ArgumentError on length limit problem' do
      names = ['c']
      expect{ TestCopyNamingAlgorithm.new(name_entities:names, max_length:4).create_copy_name(names[0]) }.to(raise_error {|e|
        expect(e).to be_a ArgumentError
        expect(e.message).to start_with("It's not possible to generate a name using name_to_copy:")
      })
    end

    it 'raises ArgumentError on copy limit problem' do
      names = ['c', 'c_copy-0']
      expect{ TestCopyNamingAlgorithm.new(name_entities:names, max_copies:1).create_copy_name(names[0]) }.to(raise_error {|e|
        expect(e).to be_a ArgumentError
        expect(e.message).to start_with("It's not possible to generate a UNIQUE name using name_to_copy:")
      })
    end
  end

  describe '.generate_copy_number' do
    it 'adds one digit for copy number if under 10' do
      algo = TestCopyNamingAlgorithm.new(max_copies:9)
      (0..9).each{|i|
        expect(algo.generate_copy_number(i)).to eq "#{i}"
      }
    end
    it 'adds 2 digits for copy number if under 100' do
      algo = TestCopyNamingAlgorithm.new(max_copies:99)
      (0..99).each{|i|
        if (i < 10)
          expect(algo.generate_copy_number(i)).to eq "0#{i}"
        else
          expect(algo.generate_copy_number(i)).to eq "#{i}"
        end
      }
    end

    it 'adds 3 digits for copy number if under 1000' do
      algo = TestCopyNamingAlgorithm.new(max_copies:999)
      (0..999).each{|i|
        if (i < 10)
          expect(algo.generate_copy_number(i)).to eq "00#{i}"
        elsif (i >= 10 && i < 100)
          expect(algo.generate_copy_number(i)).to eq "0#{i}"
        else
          expect(algo.generate_copy_number(i)).to eq "#{i}"
        end
      }
    end
  end

  class TestCopyNamingAlgorithm < CopyNamingAlgorithm
    attr_accessor :name_entities, :max_copies, :max_length

    def initialize(name_entities:[], max_length:10, max_copies: 20)
      @name_entities = name_entities
      @max_copies = max_copies
      @max_length = max_length
    end

    def copy_addition
      '_copy'
    end

    def separator_before_copy_number
      '-'
    end

    def max_length
      @max_length
    end

    def get_already_used_name_entities(base_name)
      @name_entities
    end

    def max_copies
      @max_copies
    end
  end
end