require 'spec_helper'

describe Parametron do

  context '.params' do
    it 'accepts params block' do
      expect do
        class Victim
          include Parametron
          params_for(:_) do; end
        end
      end.not_to raise_error
    end
  end

  context '.optional' do
    it 'accepts optional params' do
      expect do
        class Victim
          include Parametron
          params_for(:_) do
            optional :city, default: 'Krasnoyarsk', as: :name
          end
        end
      end.not_to raise_error
    end

    it 'accepts defaults and validator params' do
      expect do
        class Victim
          include Parametron
          params_for(:_) do
            optional :name, default: '', validator: /\d+/
          end
        end
      end.not_to raise_error
    end

    it 'accepts rename :as params' do
      expect do
        class Victim
          include Parametron
          params_for(:_) do
            optional :city, default: '', validator: /\d+/, as: :capital
          end
        end
      end.not_to raise_error
    end

    it 'store params validator' do
      class Victim
        include Parametron
        params_for(:_) do
          optional :city, default: '', validator: /\d+/
        end
      end
      Victim.params_validator.should be_kind_of(Parametron::ParamsValidator)
      Victim.params_validator.required_vals.should be_empty
      Victim.params_validator.optional_vals.should have(1).items
    end

  end # context .optional


  context '.required' do
    it 'accepts required params' do
      expect do
        class Victim
          include Parametron
          params_for(:_) do
            required :city, default: ''
          end
        end
      end.not_to raise_error
    end

    it 'accepts defaults and validator params' do
      expect do
        class Victim
          include Parametron
          params_for(:_) do
            required :city, default: '', validator: /\d+/
          end
        end
      end.not_to raise_error
    end

    it 'store params validator' do
      class Victim
        include Parametron
        params_for(:_) do
          required :city, default: '', validator: /\d+/
        end
      end
      Victim.params_validator.should be_kind_of(Parametron::ParamsValidator)
      Victim.params_validator.optional_vals.should be_empty
      Victim.params_validator.required_vals.should have(1).items
    end

  end # context .required


  context '.validate' do
    class VictimStrict
      include Parametron
      params_for(:fetch, strict: true) do
        required :city,  validator: /\w+/
        required :year,  validator: /\d+/, default: 2012
        optional :title, validator: /\w+/
        optional :other, default: 'staff'
      end
      def fetch params
      end
    end
    class VictimRelaxed
      include Parametron
      params_for(:fetch) do
        required :city,  validator: /\w+/
        required :year,  validator: /\d+/, default: 2012
        optional :title, validator: /\w+/
        optional :other, default: 'staff'
      end
      def fetch params
      end
    end

    it 'reject unexpected params' do
      class Victim
        include Parametron
        params_for(:fetch) do
          optional :city, default: 'Krasnoyarsk'
        end
        def fetch(params);  params ; end
      end
      v = Victim.new
      expect do
        v.fetch({'_'=>'Not needed'})
      end.not_to raise_error
      res = v.fetch({'_'=>'Not needed'})
      res.should_not have_key('_')
    end

    subject{ VictimStrict.new }

    it 'accepts valid params' do
      expect do
        subject.fetch({city: 'Moskow', year: '1917', title: 'Nothing', other: 'Not need'})
      end.not_to raise_error
    end

    it 'raise error when required param absent' do
      expect do
        subject.fetch({year: 1917, title: 'Nothing', other: 'Not need'})
      end.to raise_error(Parametron::RequiredParamError)
      subject.validation_error_cause.should eql [["city"]]
    end

    it 'raise error on unknown param' do
      expect do
        subject.fetch({city: 'Moskow', year: '1917', title: 'Nothing', other: 'Not need', '_' => 22})
      end.to raise_error(Parametron::ExcessParameter)
    end

    context "when strict" do
      subject{ VictimStrict.new }

      it 'raise on unknown params' do
        expect do
          subject.fetch({city: 'Moskow', year: 1917, title: 'Nothing', other: 'Not need', invalid: 'Yes'})
        end.to raise_error(Parametron::ExcessParameter)
        subject.validation_error_cause.should eql [["invalid", "Yes"]]
      end
    end # context strict

    context "when not strict" do
      subject{ VictimRelaxed.new }

      it 'not raise on unknown params' do
        expect do
          subject.fetch({city: 'Moskow', year: 1917, title: 'Nothing', other: 'Not need', invalid: 'Yes'})
        end.not_to raise_error
        subject.validation_error_cause.should eql [["invalid", "Yes"]]
      end
    end # context not strict

  end # context .validate

  context 'setting defaults for parameters' do
    class VictimHavingDefaults
      include Parametron
      params_for(:fetch, strict: true) do
        required :city,  validator: /\w+/
        required :year,  validator: /\d+/, default: '2012'
        optional :title, validator: /\w+/
        optional :other,                   default: 'staff'
      end

      attr_reader :city, :year, :title, :other

      def fetch params
        @city = params[:city]
        @year = params[:year]
        @title= params[:title]
        @other= params[:other]
      end
    end

    let(:par){{city: 'Krasn', title: 'No way'}}
    let(:par_full){{city: 'Krasn', year: '2000', title: 'No way', other: 'KillAll'}}

    it 'accepts params' do
      expect do
        obj = VictimHavingDefaults.new
        obj.fetch(par)
      end.not_to raise_error
    end

    it 'set defaults' do
      obj = VictimHavingDefaults.new
      obj.fetch(par)
      obj.city.should  eql par[:city]
      obj.title.should eql par[:title]
      obj.year.should  eql '2012'
      obj.other.should eql 'staff'
    end

    it 'given params have advantage over defaults' do
      obj = VictimHavingDefaults.new
      obj.fetch(par_full)
      obj.city.should  eql par_full[:city]
      obj.title.should eql par_full[:title]
      obj.year.should  eql par_full[:year]
      obj.other.should eql par_full[:other]
    end
  end

  context 'renames the keys' do
    class VictimWithRenames
      include Parametron
      params_for(:fetch, strict: true) do
        required :year,  validator: /\d+/, default: '2012', as: :last_year
      end

      def fetch params
        params
      end
    end

    it 'renames parameter key' do
      obj = VictimWithRenames.new
      obj.fetch({year: 2013}).should eql({:last_year => 2013})
    end

  end
end