Feature: update donation summary hook with helpful form state values

[jonwaldstein]

Resolves #

Description

Context: Gateways need access to the following values:

• Currency
• Donation Amount for one-time (including base amount, fee recovered, event tix, etc.)
• Subscription Amount & details for recurring (excluding some values like event tix, etc.)

We're currently putting a lot of responsibility on our gateways to understand our donation form values...

As our form has grown in complexity with new amount fields like event tickets, fee recovery, subscription details, and many different gateway implementations - it's been increasingly difficult to keep track of certain values across all fields.

Gateways are the most obvious place where this has been a challenge to maintain as they all are having to manually look up the total values for the donation amount, fees recovered, event tickets, subscription details etc.

While we do have our useWatch() hook from react-hook-form that allows us to find the raw values, it has become very redundant to manually look up the same values across all gateways while also accounting for the nuances of different variations.

This PR is intended to simplify and unify accessing our core donation form values.

This has been achieved by updating our useDonationSummary() hook with helpful form state values for more unification of common values.

The reason I chose to use the useDonationSummary() hook is because it's already being used across our fields / add-ons to sum total values making it a seamless update.

Here's what we are adding:

      const {state: {
            currency,
            donationAmount, 
            donationAmountMinor,
            donationAmountTotal,
            donationAmountTotalMinor,
            donationIsOneTime, 
            donationIsRecurring,
            subscriptionAmount,
            subscriptionAmountMinor,
            subscriptionPeriod,
            subscriptionFrequency,
        }} = window.givewp.form.hooks.useDonationSummary();

Scenario

• Donor selects "$50"
• Checks fee recovery of "$1.80"
• Add 2 tix for "$10" total

        const {state: {
            currency,
            donationAmount, // 50
            donationAmountMinor, // 5000
            donationAmountTotal, //  61.80 (50 + 1.80 + 10 = 61.80)
            donationAmountTotalMinor, // 6180
            donationIsOneTime, // true
            donationIsRecurring, // false
            subscriptionAmount, // 51.80 (50 + 1.80 = 51.80) does not include tix
            subscriptionAmountMinor, // 5180
            subscriptionPeriod, //  undefined 
            subscriptionFrequency, // undefined 
        }} = window.givewp.form.hooks.useDonationSummary();

Scenario

• Donor selects "$50"
• Donor selects "Monthly"
• Checks fee recovery of "$1.80"
• Add 2 tix for "$10" total

        const {state: {
            currency,
            donationAmount, // 50
            donationAmountMinor, // 5000
            donationAmountTotal, //  61.80 (50 + 1.80 + 10 = 61.80)
            donationAmountTotalMinor, // 6180
            donationIsOneTime, // false
            donationIsRecurring, // true
            subscriptionAmount, // 51.80 (50 + 1.80 = 51.80) does not include tix
            subscriptionAmountMinor, // 5180
            subscriptionPeriod, //  "month"
            subscriptionFrequency, // 1 
        }} = window.givewp.form.hooks.useDonationSummary();

Example of how this could be used in gateways to clean up redundancy:

Stripe: before

Stripe: after

PayPal before

PayPal after

Affects

This currently affects the Donation Summary field rendering.

WIP questions:

• Which totals do recurring donation support? (amount: y, fee recovery: y/n, tickets: n)
• In the visual donation summary field, should we account for when the total donation amount is different than subscription amount?

Visuals

Testing Instructions

1. Test different form scenarios and make sure the donation summary field works as expected

WIP...

Pre-review Checklist

• Acceptance criteria satisfied and marked in related issue
• Relevant @unreleased tags included in DocBlocks
• Includes unit tests
• Reviewed by the designer (if follows a design)
• Self Review of code and UX completed

[JasonTheAdams]

Nit: I suggest amountToMinorUnit — as "dollars" and "cents" are distinct terms for certain currencies. 🤓

[JasonTheAdams]

@jonwaldstein I recommend using the following array to also identify 3-decimal currencies:

const nonTwoDecimalCurrencies = {
    'BIF': 0,
    'CLP': 0,
    'DJF': 0,
    'GNF': 0,
    'ISK': 0,
    'JPY': 0,
    'KMF': 0,
    'KRW': 0,
    'PYG': 0,
    'RWF': 0,
    'UGX': 0,
    'VND': 0,
    'VUV': 0,
    'XAF': 0,
    'XOF': 0,
    'XPF': 0,
    'BHD': 3,
    'IQD': 3,
    'JOD': 3,
    'KWD': 3,
    'LYD': 3,
    'OMR': 3,
    'TND': 3
};

[JasonTheAdams]

You could then adjust your math:

decimals = nonTwoDecimalCurrencies[currency] ?? 2;
return Math.round(parseFloat(amount) * (10 ** decimals)); 

[JasonTheAdams]

I like the direction, @jonwaldstein! Thinking about the useDonationSummary() term, but I can appreciate why it's important to have an easy way for gateways to have this information.