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//
// CustomDateComponentsFormatting.swift
// MullvadVPN
//
// Created by pronebird on 14/05/2020.
// Copyright © 2020 Mullvad VPN AB. All rights reserved.
//
import Foundation
enum CustomDateComponentsFormatting {}
extension CustomDateComponentsFormatting {
/// Format a duration between the given dates returning a string that only contains one unit.
///
/// The behaviour of that method differs from `DateComponentsFormatter`:
///
/// 1. Intervals between 23h 30m - 23h 59m are rounded to 1 day to fix the iOS SDK bug which
/// results in the wrong output ("0 months").
/// 2. Intervals between 26 and 90 days are formatted in days quantity.
/// 3. Produce "Less than a minute" message for intervals below 1 minute.
///
static func localizedString(
from start: Date,
to end: Date,
calendar: Calendar = Calendar.current,
unitsStyle: DateComponentsFormatter.UnitsStyle) -> String?
{
let formatter = DateComponentsFormatter()
formatter.calendar = calendar
formatter.unitsStyle = unitsStyle
formatter.allowedUnits = [.minute, .hour, .day, .month, .year]
formatter.maximumUnitCount = 1
let dateComponents = calendar
.dateComponents([.day, .hour, .minute, .second], from: start, to: end)
let days = dateComponents.day ?? 0
let hours = dateComponents.hour ?? 0
let minutes = dateComponents.minute ?? 0
let seconds = dateComponents.second ?? 0
if days == 0 && hours == 0 && minutes == 0 && seconds < 60 {
return NSLocalizedString(
"LESS_THAN_ONE_MINUTE",
tableName: "CustomDateComponentsFormatting",
value: "Less than a minute",
comment: "Phrase used for less than 1 minute duration."
)
} else if days == 0 && hours == 23 && minutes >= 30 {
return formatter.string(from: DateComponents(calendar: calendar, day: 1))
} else if days >= 1 && days <= 90 {
formatter.allowedUnits = [.day]
return formatter.string(from: dateComponents)
} else {
return formatter.string(from: start, to: end)
}
}
}
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