module CWRUDirectory

# File lib/cwru_directory.rb, line 38
def advanced(params = {})
  search(params)
end

# File lib/cwru_directory/authentication.rb, line 3
def authenticate!
  return if @authenticated
  # Surely this will return a result, then we can click 'MORE INFO'
  # which will take us to the Single Sign On
  page = @agent.get(URL + '?' + to_query_string(default_search_params.merge({surname: 'Mason', givenname: 'Andrew'})))

  # Fill out the SSO form
  login_page = page.link_with(text: 'MORE INFO').click
  login_page.form_with(name: nil) do |form|
    form.field_with(name: 'username').value = @config.case_id
    form.field_with(name: 'password').value = @config.password
  end.submit
  @authenticated = true
end

# File lib/cwru_directory/config.rb, line 23
def configure(&block)
  @config ||= Configuration.new
  yield @config if block_given?
end

# File lib/cwru_directory.rb, line 104
def default_search_params
  {
    search_text: '',
    surname: '',
    givenname: '',
    department: '',
    location: '',
    category: :all,
    search_method: :regular
  }
end

# File lib/cwru_directory.rb, line 48
def parse_results(rows)
  header = nil
  results = {}
  index = 0
  while index < rows.length
    # We need more fine-grained control over the looping
    # because each result is actually 2 rows in the table,
    # but header rows are only one row. This is the worst
    row = rows[index]
    if row.children[0].get_attribute('class') == 'dirhdr'
      # This is a new header section.
      header = row.children[0].children[0].text
      results[header] = []
    elsif row.children[0].get_attribute('class') == 'breaker'
      # This row is just for spacing. Ignore it.
      index += 1
      next
    else
      # This is a result row. Process it and the next row
      results[header] << process_result(row, rows[index + 1])
      index += 1
    end
    index += 1
  end

  if @config.get_all_info
    authenticate! # we need to be authenticated for this
    results.values.flatten.each do |result|
      process_more_info(result, @agent.get(result[:more_info_link])) if result[:more_info_link]
    end
  end
  results
end

# File lib/cwru_directory.rb, line 92
def process_more_info(result, more_info_page)
  html = more_info_page.parser
  # The first row is the person's name and section, so we can skip that.
  html.xpath('//table[@class="longlisting"]/tr').drop(1).each do |more_info_row|
    attribute = more_info_row.children[0].text
    # There is a td of padding between the attribute and the value
    value = more_info_row.children[2].text

    result[attribute] = value
  end
end

# File lib/cwru_directory.rb, line 82
def process_result(first_row, second_row)
  {
    name: first_row.children[0].text,
    phone_number: first_row.children[1].text,
    more_info_link: first_row.children[2].children[0].get_attribute('href'),
    email: second_row.children[0].text,
    department: second_row.children[1].text
  }
end

# File lib/cwru_directory.rb, line 42
def search(params)
  page = @agent.get(URL + '?' + to_query_string(default_search_params.merge(params))).parser
  rows = page.xpath('//table[@class="dirresults"]/tr')
  parse_results(rows)
end

# File lib/cwru_directory.rb, line 23
def simple(search_text, search_method = :regular)
  search({search_text: search_text, search_method: search_method})
end

# File lib/cwru_directory.rb, line 116
def to_query_string(params)
  params.map { |k,v| "#{k}=#{v}" }.join('&')
end