# frozen_string_literal: true
# encoding: UTF-8
require 'rspec'
require 'nokogiri'

module RSpecHtmlMatchers

  # @api
  # @private
  # for nokogiri regexp matching
  class NokogiriRegexpHelper
    def initialize(regex)
      @regex = regex
    end

    def regexp node_set
      node_set.find_all { |node| node.content =~ @regex }
    end
  end

  # @api
  # @private
  class NokogiriTextHelper
    NON_BREAKING_SPACE = "\u00a0"

    def initialize text
      @text = text
    end

    def content node_set
      node_set.find_all do |node|
        actual_content = node.content.gsub(NON_BREAKING_SPACE, ' ')

        actual_content == @text
      end
    end
  end

  # @api
  # @private
  class HaveTag
    attr_reader :failure_message, :failure_message_when_negated
    attr_reader :parent_scope, :current_scope

    DESCRIPTIONS = {
      :have_at_least_1 => %Q|have at least 1 element matching "%s"|,
      :have_n          => %Q|have %i element(s) matching "%s"|
    }

    MESSAGES = {
      :expected_tag         => %Q|expected following:\n%s\nto #{DESCRIPTIONS[:have_at_least_1]}, found 0.|,
      :unexpected_tag       => %Q|expected following:\n%s\nto NOT have element matching "%s", found %s.|,

      :expected_count       => %Q|expected following:\n%s\nto #{DESCRIPTIONS[:have_n]}, found %s.|,
      :unexpected_count     => %Q|expected following:\n%s\nto NOT have %i element(s) matching "%s", but found.|,

      :expected_btw_count   => %Q|expected following:\n%s\nto have at least %i and at most %i element(s) matching "%s", found %i.|,
      :unexpected_btw_count => %Q|expected following:\n%s\nto NOT have at least %i and at most %i element(s) matching "%s", but found %i.|,

      :expected_at_most     => %Q|expected following:\n%s\nto have at most %i element(s) matching "%s", found %i.|,
      :unexpected_at_most   => %Q|expected following:\n%s\nto NOT have at most %i element(s) matching "%s", but found %i.|,

      :expected_at_least    => %Q|expected following:\n%s\nto have at least %i element(s) matching "%s", found %i.|,
      :unexpected_at_least  => %Q|expected following:\n%s\nto NOT have at least %i element(s) matching "%s", but found %i.|,

      :expected_regexp      => %Q|%s regexp expected within "%s" in following template:\n%s|,
      :unexpected_regexp    => %Q|%s regexp unexpected within "%s" in following template:\n%s\nbut was found.|,

      :expected_text        => %Q|"%s" expected within "%s" in following template:\n%s|,
      :unexpected_text      => %Q|"%s" unexpected within "%s" in following template:\n%s\nbut was found.|,

      :wrong_count_error    => %Q|:count with :minimum or :maximum has no sence!|,
      :min_max_error        => %Q|:minimum should be less than :maximum!|,
      :bad_range_error      => %Q|Your :count range(%s) has no sence!|,
    }


    def initialize tag, options={}, &block
      @tag, @options, @block = tag.to_s, options, block

      if with_attrs = @options.delete(:with)
        if classes = with_attrs.delete(:class)
          @tag += '.' + classes_to_selector(classes)
        end
        selector = with_attrs.inject('') do |html_attrs_string, (k, v)|
          html_attrs_string += "[#{k}='#{v}']"
        html_attrs_string
        end
        @tag += selector
      end

      if without_attrs = @options.delete(:without)
        if classes = without_attrs.delete(:class)
          @tag += ":not(.#{classes_to_selector(classes)})"
        end
      end

      validate_options!
    end

    def matches? document, &block
      @block = block if block

      document = document.html if defined?(Capybara::Session) && document.is_a?(Capybara::Session)

      case document
      when String
        @parent_scope = @current_scope = Nokogiri::HTML(document).css(@tag)
        @document     = document
      else
        @parent_scope  = document.current_scope
        @current_scope = begin
                           document.parent_scope.css(@tag)
                           # on jruby this produce exception if css was not found:
                           # undefined method `decorate' for nil:NilClass
                         rescue NoMethodError
                           Nokogiri::XML::NodeSet.new(Nokogiri::XML::Document.new)
                         end
        @document      = @parent_scope.to_html
      end

      if tag_presents? and text_right? and count_right?
        @current_scope = @parent_scope
        @block.call if @block
        true
      else
        false
      end
    end

    def description
      # TODO should it be more complicated?
      if @options.has_key?(:count)
        DESCRIPTIONS[:have_n] % [@options[:count],@tag]
      else
        DESCRIPTIONS[:have_at_least_1] % @tag
      end
    end

    private

    def classes_to_selector(classes)
      case classes
      when Array
        classes.join('.')
      when String
        classes.gsub(/\s+/, '.')
      end
    end

    def tag_presents?
      if @current_scope.first
        @count = @current_scope.count
        @failure_message_when_negated = MESSAGES[:unexpected_tag] % [@document, @tag, @count]
        true
      else
        @failure_message          = MESSAGES[:expected_tag] % [@document, @tag]
        false
      end
    end

    def count_right?
      case @options[:count]
      when Integer
        ((@failure_message_when_negated=MESSAGES[:unexpected_count] % [@document,@count,@tag]) && @count == @options[:count]) || (@failure_message=MESSAGES[:expected_count] % [@document,@options[:count],@tag,@count]; false)
      when Range
        ((@failure_message_when_negated=MESSAGES[:unexpected_btw_count] % [@document,@options[:count].min,@options[:count].max,@tag,@count]) && @options[:count].member?(@count)) || (@failure_message=MESSAGES[:expected_btw_count] % [@document,@options[:count].min,@options[:count].max,@tag,@count]; false)
      when nil
        if @options[:maximum]
          ((@failure_message_when_negated=MESSAGES[:unexpected_at_most] % [@document,@options[:maximum],@tag,@count]) && @count <= @options[:maximum]) || (@failure_message=MESSAGES[:expected_at_most] % [@document,@options[:maximum],@tag,@count]; false)
        elsif @options[:minimum]
          ((@failure_message_when_negated=MESSAGES[:unexpected_at_least] % [@document,@options[:minimum],@tag,@count]) && @count >= @options[:minimum]) || (@failure_message=MESSAGES[:expected_at_least] % [@document,@options[:minimum],@tag,@count]; false)
        else
          true
        end
      end
    end

    def text_right?
      return true unless @options[:text]

      case text=@options[:text]
      when Regexp
        new_scope = @current_scope.css(':regexp()',NokogiriRegexpHelper.new(text))
        unless new_scope.empty?
          @count = new_scope.count
          @failure_message_when_negated = MESSAGES[:unexpected_regexp] % [text.inspect,@tag,@document]
          true
        else
          @failure_message          = MESSAGES[:expected_regexp] % [text.inspect,@tag,@document]
          false
        end
      else
        new_scope = @current_scope.css(':content()',NokogiriTextHelper.new(text))
        unless new_scope.empty?
          @count = new_scope.count
          @failure_message_when_negated = MESSAGES[:unexpected_text] % [text,@tag,@document]
          true
        else
          @failure_message          = MESSAGES[:expected_text] % [text,@tag,@document]
          false
        end
      end
    end

    protected

    def validate_options!
      raise 'wrong :count specified' unless [Range, NilClass].include?(@options[:count].class) or @options[:count].is_a?(Integer)

      [:min, :minimum, :max, :maximum].each do |key|
        raise MESSAGES[:wrong_count_error] if @options.has_key?(key) and @options.has_key?(:count)
      end

      begin
        raise MESSAGES[:min_max_error] if @options[:minimum] > @options[:maximum]
      rescue NoMethodError # nil > 4
      rescue ArgumentError # 2 < nil
      end

      begin
        begin
          raise MESSAGES[:bad_range_error] % [@options[:count].to_s] if @options[:count] && @options[:count].is_a?(Range) && (@options[:count].min.nil? or @options[:count].min < 0)
        rescue ArgumentError, "comparison of String with" # if @options[:count] == 'a'..'z'
          raise MESSAGES[:bad_range_error] % [@options[:count].to_s]
        end
      rescue TypeError # fix for 1.8.7 for 'rescue ArgumentError, "comparison of String with"' stroke
        raise MESSAGES[:bad_range_error] % [@options[:count].to_s]
      end

      @options[:minimum] ||= @options.delete(:min)
      @options[:maximum] ||= @options.delete(:max)

      @options[:text] = @options[:text].to_s if @options.has_key?(:text) && !@options[:text].is_a?(Regexp)
    end

  end

  # tag assertion, this is the core of functionality, other matchers are shortcuts to this matcher
  #
  # @yield block where you should put with_tag, without_tag and/or other matchers
  #
  # @param [String] tag     css selector for tag you want to match, e.g. 'div', 'section#my', 'article.red'
  # @param [Hash]   options options hash(see below)
  # @option options [Hash]   :with  hash with html attributes, within this, *:class* option have special meaning, you may specify it as array of expected classes or string of classes separated by spaces, order does not matter
  # @option options [Fixnum] :count for tag count matching(*ATTENTION:* do not use :count with :minimum(:min) or :maximum(:max))
  # @option options [Range]  :count not strict tag count matching, count of tags should be in specified range
  # @option options [Fixnum] :minimum minimum count of elements to match
  # @option options [Fixnum] :min same as :minimum
  # @option options [Fixnum] :maximum maximum count of elements to match
  # @option options [Fixnum] :max same as :maximum
  # @option options [String/Regexp] :text to match tag content, could be either String or Regexp
  #
  # @example
  #   expect(rendered).to have_tag('div')
  #   expect(rendered).to have_tag('h1.header')
  #   expect(rendered).to have_tag('div#footer')
  #   expect(rendered).to have_tag('input#email', :with => { :name => 'user[email]', :type => 'email' } )
  #   expect(rendered).to have_tag('div', :count => 3)            # matches exactly 3 'div' tags
  #   expect(rendered).to have_tag('div', :count => 3..7)         # shortcut for have_tag('div', :minimum => 3, :maximum => 7)
  #   expect(rendered).to have_tag('div', :minimum => 3)          # matches more(or equal) than 3 'div' tags
  #   expect(rendered).to have_tag('div', :maximum => 3)          # matches less(or equal) than 3 'div' tags
  #   expect(rendered).to have_tag('p', :text => 'some content')  # will match "<p>some content</p>"
  #   expect(rendered).to have_tag('p', :text => /some content/i) # will match "<p>sOme cOntEnt</p>"
  #   expect(rendered).to have_tag('textarea', :with => {:name => 'user[description]'}, :text => "I like pie")
  #   expect("<html>
  #     <body>
  #       <h1>some html document</h1>
  #     </body>
  #    </html>").to have_tag('body') { with_tag('h1', :text => 'some html document') }
  #   expect('<div class="one two">').to have_tag('div', :with => { :class => ['two', 'one'] })
  #   expect('<div class="one two">').to have_tag('div', :with => { :class => 'two one' })
  def have_tag tag, options={}, &block
    # for backwards compatibility with rpecs have tag:
    options = { :text => options } if options.kind_of?(String) || options.kind_of?(Regexp)
    @__current_scope_for_nokogiri_matcher = HaveTag.new(tag, options, &block)
  end

  def have_empty_tag tag, options={}
    have_tag(tag, options.merge(text: ""))
  end

  def with_text text
    raise StandardError, 'this matcher should be used inside "have_tag" matcher block' unless defined?(@__current_scope_for_nokogiri_matcher)
    raise ArgumentError, 'this matcher does not accept block' if block_given?
    tag = @__current_scope_for_nokogiri_matcher.instance_variable_get(:@tag)
    expect(@__current_scope_for_nokogiri_matcher).to have_tag(tag, :text => text)
  end

  def without_text text
    raise StandardError, 'this matcher should be used inside "have_tag" matcher block' unless defined?(@__current_scope_for_nokogiri_matcher)
    raise ArgumentError, 'this matcher does not accept block' if block_given?
    tag = @__current_scope_for_nokogiri_matcher.instance_variable_get(:@tag)
    expect(@__current_scope_for_nokogiri_matcher).to_not have_tag(tag, :text => text)
  end
  alias :but_without_text :without_text

  # with_tag matcher
  # @yield block where you should put other with_tag or without_tag
  # @see #have_tag
  # @note this should be used within block of have_tag matcher
  def with_tag tag, options={}, &block
    expect(@__current_scope_for_nokogiri_matcher).to have_tag(tag, options, &block)
  end

  # without_tag matcher
  # @yield block where you should put other with_tag or without_tag
  # @see #have_tag
  # @note this should be used within block of have_tag matcher
  def without_tag tag, options={}, &block
    expect(@__current_scope_for_nokogiri_matcher).to_not have_tag(tag, options, &block)
  end

  # form assertion
  #
  # it is a shortcut to
  #   have_tag 'form', :with => { :action => action_url, :method => method ... }
  # @yield block with with_<field>, see below
  # @see #have_tag
  def have_form action_url, method, options={}, &block
    options[:with] ||= {}
    id = options[:with].delete(:id)
    tag = 'form'; tag += '#'+id if id
    options[:with].merge!(:action => action_url)
    options[:with].merge!(:method => method.to_s)
    have_tag tag, options, &block
  end

  #@TODO fix code duplications

  def with_hidden_field name, value=nil
    options = form_tag_options('hidden',name,value)
    should_have_input(options)
  end

  def without_hidden_field name, value=nil
    options = form_tag_options('hidden',name,value)
    should_not_have_input(options)
  end

  def with_text_field name, value=nil
    options = form_tag_options('text',name,value)
    should_have_input(options)
  end

  def without_text_field name, value=nil
    options = form_tag_options('text',name,value)
    should_not_have_input(options)
  end

  def with_email_field name, value=nil
    options = form_tag_options('email',name,value)
    should_have_input(options)
  end

  def without_email_field name, value=nil
    options = form_tag_options('email',name,value)
    should_not_have_input(options)
  end

  def with_url_field name, value=nil
    options = form_tag_options('url',name,value)
    should_have_input(options)
  end

  def without_url_field name, value=nil
    options = form_tag_options('url',name,value)
    should_not_have_input(options)
  end

  def with_number_field name, value=nil
    options = form_tag_options('number',name,value)
    should_have_input(options)
  end

  def without_number_field name, value=nil
    options = form_tag_options('number',name,value)
    should_not_have_input(options)
  end

  def with_range_field name, min, max, options={}
    options = { :with => { :name => name, :type => 'range', :min => min.to_s, :max => max.to_s }.merge(options.delete(:with)||{}) }
    should_have_input(options)
  end

  def without_range_field name, min=nil, max=nil, options={}
    options = { :with => { :name => name, :type => 'range' }.merge(options.delete(:with)||{}) }
    options[:with].merge!(:min => min.to_s) if min
    options[:with].merge!(:max => max.to_s) if max
    should_not_have_input(options)
  end

  DATE_FIELD_TYPES = %w( date month week time datetime datetime-local )

  def with_date_field date_field_type, name=nil, options={}
    date_field_type = date_field_type.to_s
    raise "unknown type `#{date_field_type}` for date picker" unless DATE_FIELD_TYPES.include?(date_field_type)
    options = { :with => { :type => date_field_type.to_s }.merge(options.delete(:with)||{}) }
    options[:with].merge!(:name => name.to_s) if name
    should_have_input(options)
  end

  def without_date_field date_field_type, name=nil, options={}
    date_field_type = date_field_type.to_s
    raise "unknown type `#{date_field_type}` for date picker" unless DATE_FIELD_TYPES.include?(date_field_type)
    options = { :with => { :type => date_field_type.to_s }.merge(options.delete(:with)||{}) }
    options[:with].merge!(:name => name.to_s) if name
    should_not_have_input(options)
  end

  def with_password_field name, value=nil
    # TODO add ability to explicitly say that value should be empty
    options = form_tag_options('password',name,value)
    should_have_input(options)
  end

  def without_password_field name, value=nil
    options = form_tag_options('password',name,value)
    should_not_have_input(options)
  end

  def with_file_field name, value=nil
    options = form_tag_options('file',name,value)
    should_have_input(options)
  end

  def without_file_field name, value=nil
    options = form_tag_options('file',name,value)
    should_not_have_input(options)
  end

  def with_text_area name
    # TODO, should be: with_text_area name, text=nil
    #options = form_tag_options('text',name,value)
    options = { :with => { :name => name } }
    expect(@__current_scope_for_nokogiri_matcher).to have_tag('textarea', options)
  end

  def without_text_area name
    # TODO, should be: without_text_area name, text=nil
    #options = form_tag_options('text',name,value)
    options = { :with => { :name => name } }
    expect(@__current_scope_for_nokogiri_matcher).to_not have_tag('textarea', options)
  end

  def with_checkbox name, value=nil
    options = form_tag_options('checkbox',name,value)
    should_have_input(options)
  end

  def without_checkbox name, value=nil
    options = form_tag_options('checkbox',name,value)
    should_not_have_input(options)
  end

  def with_radio_button name, value
    options = form_tag_options('radio',name,value)
    should_have_input(options)
  end

  def without_radio_button name, value
    options = form_tag_options('radio',name,value)
    should_not_have_input(options)
  end

  def with_select name, options={}, &block
    options[:with] ||= {}
    id = options[:with].delete(:id)
    tag='select'; tag += '#'+id if id
    options[:with].merge!(:name => name)
    expect(@__current_scope_for_nokogiri_matcher).to have_tag(tag, options, &block)
  end

  def without_select name, options={}, &block
    options[:with] ||= {}
    id = options[:with].delete(:id)
    tag='select'; tag += '#'+id if id
    options[:with].merge!(:name => name)
    expect(@__current_scope_for_nokogiri_matcher).to_not have_tag(tag, options, &block)
  end

  def with_option text, value=nil, options={}
    options[:with] ||= {}
    if value.is_a?(Hash)
      options.merge!(value)
      value=nil
    end
    tag='option'
    options[:with].merge!(:value => value.to_s) if value
    if options[:selected]
      options[:with].merge!(:selected => "selected")
    end
    options.delete(:selected)
    options.merge!(:text => text) if text
    expect(@__current_scope_for_nokogiri_matcher).to have_tag(tag, options)
  end

  def without_option text, value=nil, options={}
    options[:with] ||= {}
    if value.is_a?(Hash)
      options.merge!(value)
      value=nil
    end
    tag='option'
    options[:with].merge!(:value => value.to_s) if value
    if options[:selected]
      options[:with].merge!(:selected => "selected")
    end
    options.delete(:selected)
    options.merge!(:text => text) if text
    expect(@__current_scope_for_nokogiri_matcher).to_not have_tag(tag, options)
  end

  def with_button text, value=nil, options={}
    options[:with] ||= {}
    if value.is_a?(Hash)
      options.merge!(value)
      value=nil
    end
    options[:with].merge!(:value => value.to_s) if value
    options.merge!(:text => text) if text
    expect(@__current_scope_for_nokogiri_matcher).to have_tag('button', options)
  end

  def without_button text, value=nil, options={}
    options[:with] ||= {}
    if value.is_a?(Hash)
      options.merge!(value)
      value=nil
    end
    options[:with].merge!(:value => value.to_s) if value
    options.merge!(:text => text) if text
    expect(@__current_scope_for_nokogiri_matcher).to_not have_tag('button', options)
  end

  def with_submit value
    options = { :with => { :type => 'submit', :value => value } }
    #options = form_tag_options('text',name,value)
    should_have_input(options)
  end

  def without_submit value
    #options = form_tag_options('text',name,value)
    options = { :with => { :type => 'submit', :value => value } }
    should_not_have_input(options)
  end

  private

  def should_have_input(options)
    expect(@__current_scope_for_nokogiri_matcher).to have_tag('input', options)
  end

  def should_not_have_input(options)
    expect(@__current_scope_for_nokogiri_matcher).to_not have_tag('input', options)
  end

  # form_tag in method name name mean smth. like input, submit, tags that should appear in a form
  def form_tag_options form_tag_type, form_tag_name, form_tag_value=nil
    options = { :with => { :name => form_tag_name, :type => form_tag_type } }
    # .to_s if value is a digit or smth. else, see issue#10
    options[:with].merge!(:value => form_tag_value.to_s) if form_tag_value
    return options
  end

end