module Account::DatesHelper

def am_pm?
  !"#{I18n.t("time.am", fallback: false, default: "")}#{I18n.t("time.pm", fallback: false, default: "")}".empty?
end

def current_time_zone
  current_time_zone_name = current_user&.time_zone || current_user&.current_team&.time_zone || "UTC"
  ActiveSupport::TimeZone.find_tzinfo(current_time_zone_name).name
end

def display_date(timestamp, custom_date_format = nil, format: :default, date_format: nil)
  return nil unless timestamp
  format = date_format if date_format
  if format && format == :default
    # e.g. October 11, 2018
    if custom_date_format
      local_time(timestamp).strftime(custom_date_format)
    elsif local_time(timestamp).year == local_time(Time.now).year
      local_time(timestamp).strftime("%B %-d")
    else
      local_time(timestamp).strftime("%B %-d, %Y")
    end
  else
    localize(local_time(timestamp).to_date, format: format)
  end
end

def display_date_and_time(timestamp, custom_date_format = nil, custom_time_format = nil, format: :default, date_format: nil, time_format: nil)
  return nil unless timestamp
  format = "#{date_format} #{time_format}" if date_format && time_format
  if format && format == :default
    # e.g. Today at 4:22 PM
    # e.g. Yesterday at 2:12 PM
    # e.g. April 24 at 7:39 AM
    # today?
    if local_time(timestamp).to_date == local_time(Time.now).to_date
      "Today at #{display_time(timestamp, custom_time_format)}"
    # yesterday?
    elsif (local_time(timestamp).to_date) == (local_time(Time.now).to_date - 1.day)
      "Yesterday at #{display_time(timestamp, custom_time_format)}"
    else
      "#{display_date(timestamp, custom_date_format)} at #{display_time(timestamp, custom_time_format)}"
    end
  else
    localize(local_time(timestamp).to_datetime, format: format)
  end
end

def display_time(timestamp, custom_time_format = nil, format: :default, time_format: nil)
  return nil unless timestamp
  format = time_format if time_format
  if format && format == :default
    # e.g. 4:22 PM
    local_time(timestamp).strftime(custom_time_format || "%l:%M %p")
  else
    localize(local_time(timestamp).to_time, format: format)
  end
end

def local_time(timestamp)
  timestamp&.in_time_zone(current_user.time_zone)
end

def time_zone_name_to_id
  ActiveSupport::TimeZone.all.map { |tz| {tz.name.to_s => tz.tzinfo.name} }.reduce({}, :merge)
end