module Hizuke::DynamicPatternMatcher

def check_days_patterns(text)
  check_in_x_days_pattern(text) || check_x_days_ago_pattern(text)
end

def check_dynamic_patterns(text)
  # Try each pattern type
  check_days_patterns(text) ||
    check_weeks_patterns(text) ||
    check_months_patterns(text) ||
    check_years_patterns(text)
end

def check_in_x_days_pattern(text)
  if (match = text.match(IN_X_DAYS_PATTERN))
    days = match[1].to_i
    date = Date.today + days
    clean_text = text.gsub(match[0], '').strip
    return Result.new(clean_text, date)
  end
  nil
end

def check_in_x_months_pattern(text)
  if (match = text.match(IN_X_MONTHS_PATTERN))
    months = match[1].to_i
    date = Date.today >> months
    clean_text = text.gsub(match[0], '').strip
    return Result.new(clean_text, date)
  end
  nil
end

def check_in_x_weeks_pattern(text)
  if (match = text.match(IN_X_WEEKS_PATTERN))
    weeks = match[1].to_i
    date = Date.today + (weeks * 7)
    clean_text = text.gsub(match[0], '').strip
    return Result.new(clean_text, date)
  end
  nil
end

def check_in_x_years_pattern(text)
  if (match = text.match(IN_X_YEARS_PATTERN))
    years = match[1].to_i
    date = Date.new(Date.today.year + years, Date.today.month, Date.today.day)
    clean_text = text.gsub(match[0], '').strip
    return Result.new(clean_text, date)
  end
  nil
end

def check_months_patterns(text)
  check_in_x_months_pattern(text) || check_x_months_ago_pattern(text)
end

def check_weeks_patterns(text)
  check_in_x_weeks_pattern(text) || check_x_weeks_ago_pattern(text)
end

def check_x_days_ago_pattern(text)
  if (match = text.match(X_DAYS_AGO_PATTERN))
    days = match[1].to_i
    date = Date.today - days
    clean_text = text.gsub(match[0], '').strip
    return Result.new(clean_text, date)
  end
  nil
end

def check_x_months_ago_pattern(text)
  if (match = text.match(X_MONTHS_AGO_PATTERN))
    months = match[1].to_i
    date = Date.today << months
    clean_text = text.gsub(match[0], '').strip
    return Result.new(clean_text, date)
  end
  nil
end

def check_x_weeks_ago_pattern(text)
  if (match = text.match(X_WEEKS_AGO_PATTERN))
    weeks = match[1].to_i
    date = Date.today - (weeks * 7)
    clean_text = text.gsub(match[0], '').strip
    return Result.new(clean_text, date)
  end
  nil
end

def check_x_years_ago_pattern(text)
  if (match = text.match(X_YEARS_AGO_PATTERN))
    years = match[1].to_i
    date = Date.new(Date.today.year - years, Date.today.month, Date.today.day)
    clean_text = text.gsub(match[0], '').strip
    return Result.new(clean_text, date)
  end
  nil
end

def check_years_patterns(text)
  check_in_x_years_pattern(text) || check_x_years_ago_pattern(text)
end