Ruby

Comprehensive Challenges

def set_reminder(messages, extract_reminder_text)
 # Write your code here
end


DAYS_OF_WEEK = %w[sunday monday tuesday wednesday thursday friday saturday]
CURRENT_WDAY = Time.now.wday

def set_reminder(messages, extract_method)
  day_keywords = %w[today tomorrow yesterday everyday]
  reminders = Hash[DAYS_OF_WEEK.map{|day| [day, []]}]
  messages.each do |message|
    days, message = find_and_remove_day(message, day_keywords)
    next unless days
    reminder = extract_method.call(message)
    days.map{|day| reminders[day] << reminder}
  end
  reminders
end

def find_and_remove_day(message, day_keywords)
  (day_keywords + DAYS_OF_WEEK).each do |keyword|
    if keyword_present?(message, keyword)
      return [keyword_to_days(keyword), remove_keywords(message, keyword)]
    end
  end
  false
end

def keyword_to_days(keyword)
  case keyword
  when 'today'
    [DAYS_OF_WEEK[CURRENT_WDAY]]
  when 'tomorrow'
    [DAYS_OF_WEEK[CURRENT_WDAY + 1]]
  when 'yesterday'
    [DAYS_OF_WEEK[CURRENT_WDAY - 1]]
  when 'everyday'
    DAYS_OF_WEEK
  else
    [keyword]
  end
end

def keyword_present?(message, keyword)
  message.downcase.include?(keyword)
end

def remove_keywords(message, keyword)
  message.gsub(keyword, '').gsub('on','').strip
end
