require 'rspec/core'

module Pundit
  module Matchers
    RSpec::Matchers.define :permit_action do |action|
      match do |policy|
        policy.public_send("#{action}?")
      end

      failure_message do |policy|
        "#{policy.class} does not permit #{action} on #{policy.record} for " \
          "#{policy.user.inspect}."
      end

      failure_message_when_negated do |policy|
        "#{policy.class} does not forbid #{action} on #{policy.record} for " \
          "#{policy.user.inspect}."
      end
    end

    RSpec::Matchers.define :permit_new_and_create_actions do
      match do |policy|
        policy.new? && policy.create?
      end

      failure_message do |policy|
        "#{policy.class} does not permit the new or create action on " \
          "#{policy.record} for #{policy.user.inspect}."
      end

      failure_message_when_negated do |policy|
        "#{policy.class} does not forbid the new or create action on " \
          "#{policy.record} for #{policy.user.inspect}."
      end
    end

    RSpec::Matchers.define :permit_edit_and_update_actions do
      match do |policy|
        policy.edit? && policy.update?
      end

      failure_message do |policy|
        "#{policy.class} does not permit the edit or update action on " \
          "#{policy.record} for #{policy.user.inspect}."
      end

      failure_message_when_negated do |policy|
        "#{policy.class} does not forbid the edit or update action on " \
          "#{policy.record} for #{policy.user.inspect}."
      end
    end

    RSpec::Matchers.define :permit_mass_assignment_of do |attribute|
      match do |policy|
        if @action
          policy.send("permitted_attributes_for_#{@action}").include? attribute
        else
          policy.permitted_attributes.include? attribute
        end
      end

      chain :for_action do |action|
        @action = action
      end

      failure_message do |policy|
        if @action
          "#{policy.class} does not permit the mass assignment of the " \
            "#{attribute} attribute, when authorising the #{@action} action, " \
            "for #{policy.user.inspect}."
        else
          "#{policy.class} does not permit the mass assignment of the " \
            "#{attribute} attribute for #{policy.user.inspect}."
        end
      end

      failure_message_when_negated do |policy|
        if @action
          "#{policy.class} does not forbid the mass assignment of the " \
            "#{attribute} attribute, when authorising the #{@action} action, " \
            "for #{policy.user.inspect}."
        else
          "#{policy.class} does not forbid the mass assignment of the " \
            "#{attribute} attribute for #{policy.user.inspect}."
        end
      end
    end

    RSpec::Matchers.define :forbid_action do |action|
      match do |policy|
        !policy.public_send("#{action}?")
      end

      failure_message do |policy|
        "#{policy.class} does not forbid #{action} on #{policy.record} for " \
          "#{policy.user.inspect}."
      end

      failure_message_when_negated do |policy|
        "#{policy.class} does not permit #{action} on #{policy.record} for " \
          "#{policy.user.inspect}."
      end
    end

    RSpec::Matchers.define :forbid_new_and_create_actions do
      match do |policy|
        !policy.new? && !policy.create?
      end

      failure_message do |policy|
        "#{policy.class} does not forbid the new or create action on " \
          "#{policy.record} for #{policy.user.inspect}."
      end

      failure_message_when_negated do |policy|
        "#{policy.class} does not permit the new or create action on " \
          "#{policy.record} for #{policy.user.inspect}."
      end
    end

    RSpec::Matchers.define :forbid_edit_and_update_actions do
      match do |policy|
        !policy.edit? && !policy.update?
      end

      failure_message do |policy|
        "#{policy.class} does not forbid the edit or update action on " \
          "#{policy.record} for #{policy.user.inspect}."
      end

      failure_message_when_negated do |policy|
        "#{policy.class} does not permit the edit or update action on " \
          "#{policy.record} for #{policy.user.inspect}."
      end
    end

    RSpec::Matchers.define :forbid_mass_assignment_of do |attribute|
      match do |policy|
        if @action
          policy.send("permitted_attributes_for_#{@action}").exclude? attribute
        else
          policy.permitted_attributes.exclude? attribute
        end
      end

      chain :for_action do |action|
        @action = action
      end

      failure_message do |policy|
        if @action
          "#{policy.class} does not forbid the mass assignment of the " \
            "#{attribute} attribute, when authorising the #{@action} action, " \
            "for #{policy.user.inspect}."
        else
          "#{policy.class} does not forbid the mass assignment of the " \
            "#{attribute} attribute for #{policy.user.inspect}."
        end
      end

      failure_message_when_negated do |policy|
        if @action
          "#{policy.class} does not permit the mass assignment of the " \
            "#{attribute} attribute, when authorising the #{@action} action, " \
            "for #{policy.user.inspect}."
        else
          "#{policy.class} does not permit the mass assignment of the " \
            "#{attribute} attribute for #{policy.user.inspect}."
        end
      end
    end
  end
end

if defined?(Pundit)
  RSpec.configure do |config|
    config.include Pundit::Matchers
  end
end