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PledgeAmountViewModel.swift
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PledgeAmountViewModel.swift
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import KsApi
import Prelude
import ReactiveExtensions
import ReactiveSwift
import UIKit
public typealias PledgeAmountData = (amount: Double, min: Double, max: Double, isValid: Bool)
public typealias PledgeAmountViewConfigData = (
project: Project,
reward: Reward,
currentAmount: Double
)
public enum PledgeAmountStepperConstants {
static let max: Double = 1_000_000_000
}
public protocol PledgeAmountViewModelInputs {
func configureWith(data: PledgeAmountViewConfigData)
func doneButtonTapped()
func stepperValueChanged(_ value: Double)
func textFieldDidEndEditing(_ value: String?)
func textFieldValueChanged(_ value: String?)
func unavailableAmountChanged(to amount: Double)
}
public protocol PledgeAmountViewModelOutputs {
var currency: Signal<String, Never> { get }
var doneButtonIsEnabled: Signal<Bool, Never> { get }
var generateSelectionFeedback: Signal<Void, Never> { get }
var generateNotificationWarningFeedback: Signal<Void, Never> { get }
var labelTextColor: Signal<UIColor, Never> { get }
var maxPledgeAmountErrorLabelIsHidden: Signal<Bool, Never> { get }
var maxPledgeAmountErrorLabelText: Signal<String, Never> { get }
var plusSignLabelHidden: Signal<Bool, Never> { get }
var notifyDelegateAmountUpdated: Signal<PledgeAmountData, Never> { get }
var stepperMaxValue: Signal<Double, Never> { get }
var stepperMinValue: Signal<Double, Never> { get }
var stepperValue: Signal<Double, Never> { get }
var subTitleLabelHidden: Signal<Bool, Never> { get }
var textFieldIsFirstResponder: Signal<Bool, Never> { get }
var textFieldTextColor: Signal<UIColor?, Never> { get }
var textFieldValue: Signal<String, Never> { get }
var titleLabelText: Signal<String, Never> { get }
}
public protocol PledgeAmountViewModelType {
var inputs: PledgeAmountViewModelInputs { get }
var outputs: PledgeAmountViewModelOutputs { get }
}
public final class PledgeAmountViewModel: PledgeAmountViewModelType,
PledgeAmountViewModelInputs, PledgeAmountViewModelOutputs {
public init() {
let configData = self.projectAndRewardProperty.signal
.skipNil()
let project = configData
.map(first)
let reward = configData
.map(second)
let currentAmount = configData
.map(third)
let minAndMax = Signal.combineLatest(
project,
reward
)
.map { project, reward -> (Double, Double) in
let (min, max) = minAndMaxPledgeAmount(forProject: project, reward: reward)
// Minimum amount for regular rewards is zero as this is the "bonus support" amount.
return (reward.isNoReward ? min : 0, max)
}
let minValue = minAndMax
.map(first)
let unavailableAmount = Signal.merge(
self.projectAndRewardProperty.signal.mapConst(0)
.take(until: self.unavailableAmountChangedProperty.signal.ignoreValues()),
self.unavailableAmountChangedProperty.signal
)
let maxValue = minAndMax
.map(second)
.combineLatest(with: unavailableAmount)
.map(-)
let textFieldInputValue = self.textFieldDidEndEditingProperty.signal
.skipNil()
.map(Double.init)
.skipNil()
.map { rounded($0, places: 2) }
let initialValue = Signal.combineLatest(
project,
currentAmount,
minValue
)
.map(initialPledgeAmount)
let stepperValue = Signal.merge(
initialValue,
textFieldInputValue,
self.stepperValueProperty.signal
)
self.textFieldValue = stepperValue
.map { value in
// Adds trailing zeros if the rounded number has non-zero remainder
// Removes trailing zeros and the decimal point otherwise
// Example:
// 25 => 25
// 25. => 25
// 25.0 => 25
// 25.00 => 25
// 25.1 => 25.10
// 25.10 = 25.10
let numberOfDecimalPlaces = value.truncatingRemainder(dividingBy: 1) == 0 ? 0 : 2
return String(format: "%.\(numberOfDecimalPlaces)f", value)
}
self.currency = project
.map { currencySymbol(forCountry: $0.country).trimmed() }
let textFieldValue = self.textFieldValueProperty.signal
.map { $0.coalesceWith("") }
.map(Double.init)
.map { $0.coalesceWith(0) }
let updatedValue = Signal.combineLatest(
minValue,
maxValue,
Signal.merge(
stepperValue,
textFieldValue.signal
)
)
self.stepperMinValue = updatedValue
.map { ($0.0, $0.2) }
.map(min)
self.stepperMaxValue = minValue.mapConst(PledgeAmountStepperConstants.max)
let stepperValueChanged = Signal.combineLatest(
self.stepperMinValue.signal,
self.stepperMaxValue.signal,
self.stepperValueProperty.signal
)
self.generateSelectionFeedback = stepperValueChanged
.filter { min, max, value in min < value && value < max }
.ignoreValues()
self.generateNotificationWarningFeedback = stepperValueChanged
.filter { min, max, value in value <= min || max <= value }
.ignoreValues()
self.notifyDelegateAmountUpdated = updatedValue
.map { min, max, value in
(rounded(value, places: 2), min, max, min <= value && value <= max)
}
self.maxPledgeAmountErrorLabelIsHidden = updatedValue
.map { _, max, value in value <= max }
let isValueValid = self.notifyDelegateAmountUpdated
.map { $0.3 }
.skipRepeats()
self.maxPledgeAmountErrorLabelText = updatedValue
.map(second)
.combineLatest(with: project)
.map { max, project in
let maxPledge = Format.currency(max, country: project.country, omitCurrencyCode: false)
return Strings.Enter_an_amount_less_than_max_pledge(max_pledge: maxPledge)
}
.skipRepeats()
self.doneButtonIsEnabled = isValueValid
let textColor = isValueValid
.map { $0 ? UIColor.ksr_create_700 : UIColor.ksr_alert }
self.labelTextColor = textColor
self.stepperValue = self.notifyDelegateAmountUpdated.map { $0.0 }.skipRepeats()
self.textFieldIsFirstResponder = self.doneButtonTappedProperty.signal
.mapConst(false)
self.textFieldTextColor = textColor
.wrapInOptional()
self.plusSignLabelHidden = reward.map(\.isNoReward)
self.subTitleLabelHidden = reward.map(\.isNoReward)
self.titleLabelText = reward.map(\.isNoReward).map {
$0 ? Strings.Your_pledge_amount() : Strings.Bonus_support()
}
}
private let projectAndRewardProperty = MutableProperty<PledgeAmountViewConfigData?>(nil)
public func configureWith(data: PledgeAmountViewConfigData) {
self.projectAndRewardProperty.value = data
}
private let doneButtonTappedProperty = MutableProperty(())
public func doneButtonTapped() {
self.doneButtonTappedProperty.value = ()
}
private let stepperValueProperty = MutableProperty<Double>(0)
public func stepperValueChanged(_ value: Double) {
self.stepperValueProperty.value = value
}
private let textFieldDidEndEditingProperty = MutableProperty<String?>(nil)
public func textFieldDidEndEditing(_ value: String?) {
self.textFieldDidEndEditingProperty.value = value
}
private let textFieldValueProperty = MutableProperty<String?>(nil)
public func textFieldValueChanged(_ value: String?) {
self.textFieldValueProperty.value = value
}
private let unavailableAmountChangedProperty = MutableProperty<Double>(0)
public func unavailableAmountChanged(to amount: Double) {
self.unavailableAmountChangedProperty.value = amount
}
public let currency: Signal<String, Never>
public let doneButtonIsEnabled: Signal<Bool, Never>
public let generateSelectionFeedback: Signal<Void, Never>
public let generateNotificationWarningFeedback: Signal<Void, Never>
public let labelTextColor: Signal<UIColor, Never>
public let maxPledgeAmountErrorLabelIsHidden: Signal<Bool, Never>
public let maxPledgeAmountErrorLabelText: Signal<String, Never>
public let notifyDelegateAmountUpdated: Signal<PledgeAmountData, Never>
public let plusSignLabelHidden: Signal<Bool, Never>
public let stepperMaxValue: Signal<Double, Never>
public let stepperMinValue: Signal<Double, Never>
public let stepperValue: Signal<Double, Never>
public let subTitleLabelHidden: Signal<Bool, Never>
public let textFieldTextColor: Signal<UIColor?, Never>
public let textFieldIsFirstResponder: Signal<Bool, Never>
public let textFieldValue: Signal<String, Never>
public let titleLabelText: Signal<String, Never>
public var inputs: PledgeAmountViewModelInputs { return self }
public var outputs: PledgeAmountViewModelOutputs { return self }
}
// MARK: - Functions
private func initialPledgeAmount(
from project: Project,
currentAmount: Double,
minValue: Double
) -> Double {
guard userIsBackingProject(project) else { return minValue }
return max(currentAmount, minValue)
}
/*
A helper that assists in rounding a Double to a given number of decimal places
NB: Do not use this for rounding elsewhere.
*/
private func rounded(_ value: Double, places: Int) -> Double {
let divisor = pow(10.0, Double(places))
return (value * divisor).rounded() / divisor
}