62 lines
2.0 KiB
C#
62 lines
2.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Threading.Tasks;
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using FinancialApi.Domain;
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using Wolverine.Persistence;
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namespace FinancialApi.Application;
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public record ApplyFeeCommand(int AccountId, decimal Amount);
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public record FeeAppliedEvent(int AccountId, decimal Amount);
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public record FeePair(Account Source, Account Destination, DateTimeOffset TimeStamp);
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public static class ApplyFeeHandler
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{
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public static async Task<FeePair> LoadAsync(
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ApplyFeeCommand cmd,
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IAccountQuery query, TimeProvider timeProvider)
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{
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var source = await query.FindByIdAsync(cmd.AccountId);
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var dest = await query.FindByIdAsync(99999);
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if (source == null || dest == null)
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{
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throw new InvalidOperationException($"Cannot process transfer. Account(s) not found.");
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}
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return new FeePair(source, dest, timeProvider.GetUtcNow());
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}
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public static (
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IStorageAction<Account> CustomerWrite,
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IStorageAction<Account> RevenueWrite,
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IStorageAction<JournalEntry> JournalWrite,
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FeeAppliedEvent Event
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)
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Handle(
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ApplyFeeCommand cmd,
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FeePair pair
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)
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{
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var updatedSource = pair.Source.ApplyPosting(cmd.Amount, EntryType.Debit);
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var updatedRevenue = pair.Destination.ApplyPosting(cmd.Amount, EntryType.Credit);
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var lines = new List<JournalLine>
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{
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new(updatedSource.Id, cmd.Amount, EntryType.Debit),
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new(updatedRevenue.Id, cmd.Amount, EntryType.Credit)
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};
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var journalEntry = BalancedJournal.Create(Guid.NewGuid(),
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$"Service Fee Applied: {cmd.Amount} to Account {cmd.AccountId}",
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pair.TimeStamp, lines);
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var @event = new FeeAppliedEvent(cmd.AccountId, cmd.Amount);
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return (
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Storage.Update(updatedSource),
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Storage.Update(updatedRevenue),
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Storage.Insert(journalEntry.Entry),
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@event
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);
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}
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} |