implemented purpose proposals based on source, dest and amount

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

accounting/src/main/java/de/srsoftware/umbrella/accounting/AccountDb.java

@@ -5,11 +5,14 @@ import de.srsoftware.umbrella.core.model.Account;
 import de.srsoftware.umbrella.core.model.Transaction;
 import java.util.Collection;
 import java.util.List;
+import java.util.Optional;
 import java.util.Set;
 
 public interface AccountDb {
 	void dropTransactionTag(long transactionId, String tag);
 
+	Optional<Transaction> lastTransaction(long accountId, String source, String dest, double amount);
+
 	Collection<Account> listAccounts(long userId);
 
 	Collection<String> listTags(long accountId, String source, String destination);

accounting/src/main/java/de/srsoftware/umbrella/accounting/AccountingModule.java

@@ -295,6 +295,22 @@ public class AccountingModule extends BaseHandler implements AccountingService {
 		return sendContent(ex,newAccount != null ? newAccount : transaction);
 	}
 
+	public boolean postGetLastTransaction(long accountId, UmbrellaUser user, HttpExchange ex) throws IOException {
+		var json = json(ex);
+		if (!json.has(Field.SOURCE)) throw missingField(Field.SOURCE);
+		if (!(json.get(Field.SOURCE) instanceof JSONObject src)) throw invalidField(Field.SOURCE,JSON);
+		var source = src.get(src.has(Field.ID) ? Field.ID : Field.DISPLAY).toString();
+		if (!json.has(Field.DESTINATION)) throw missingField(Field.DESTINATION);
+		if (!(json.get(Field.DESTINATION) instanceof JSONObject dst)) throw invalidField(Field.SOURCE,JSON);
+		var dest = dst.get(dst.has(Field.ID) ? Field.ID : Field.DISPLAY).toString();
+		if (!json.has(Field.AMOUNT)) throw missingField(Field.AMOUNT);
+		if (!(json.get(Field.AMOUNT) instanceof Number amt)) throw invalidField(Field.AMOUNT,Text.NUMBER);
+		var amount = amt.doubleValue();
+
+		var transaction = accountDb.lastTransaction(accountId, source, dest, amount);
+		return transaction.isPresent() ? sendContent(ex,transaction.get()) : notFound(ex);
+	}
+
 	public boolean postSearchDestinations(UmbrellaUser user, HttpExchange ex) throws IOException {
 		return sendContent(ex,searchOptions(user, Field.DESTINATION, body(ex)));
 	}
@@ -327,7 +343,9 @@ public class AccountingModule extends BaseHandler implements AccountingService {
 	}
 
 	private boolean postToAccount(long accountId, Path path, UmbrellaUser user, HttpExchange ex) throws IOException {
-		return switch (path.pop()) {
+		var head = path.pop();
+		return switch (head) {
+			case PURPOSES -> postGetLastTransaction(accountId,user,ex);
 			case TAGS -> postSearchTags(accountId,user,ex);
 			case null, default -> super.doPost(path,ex);
 		};

accounting/src/main/java/de/srsoftware/umbrella/accounting/SqliteDb.java

@@ -2,6 +2,7 @@
 package de.srsoftware.umbrella.accounting;
 
 import static de.srsoftware.tools.NotImplemented.notImplemented;
+import static de.srsoftware.tools.Optionals.nullable;
 import static de.srsoftware.tools.jdbc.Condition.*;
 import static de.srsoftware.tools.jdbc.Query.*;
 import static de.srsoftware.tools.jdbc.Query.SelectQuery.ALL;
@@ -130,6 +131,29 @@ public class SqliteDb extends BaseDb implements AccountDb {
 		}
 	}
 
+	@Override
+	public Optional<Transaction> lastTransaction(long accountId, String source, String dest, double amount) {
+		try {
+			var rs = select(ALL).from(TABLE_TRANSACTIONS)
+					.where(ACCOUNT,equal(accountId)).where(SOURCE,equal(source)).where(DESTINATION,equal(dest)).where(AMOUNT,equal(amount))
+					.sort(ID+" DESC")
+					.limit(1)
+					.exec(db);
+			Transaction ta = null;
+			if (rs.next()) ta = Transaction.of(rs);
+			rs.close();
+			if (ta != null){
+				var tags = ta.tags();
+				rs = select(TAG).from(TABLE_TAGS_TRANSACTIONS).leftJoin(TAG_ID,TABLE_TAGS,ID).where(TRANSACTION_ID,equal(ta.id())).exec(db);
+				while (rs.next()) tags.add(rs.getString(1));
+				rs.close();
+			}
+			return nullable(ta);
+		} catch (SQLException e) {
+			throw failedToSearchDb(t(Text.ACCOUNTING));
+		}
+	}
+
 	@Override
 	public HashSet<Account> listAccounts(long userId) {
 		try {

frontend/src/Components/Autocomplete.svelte

@@ -145,7 +145,7 @@
 </style>
 
 <span class="autocomplete">
-    <input type="text" bind:value={candidate.display} {onkeyup} autofocus={autofocus} />
+    <input type="text" bind:value={candidate.display} {onkeyup} autofocus={autofocus} {id} />
     {#if candidates && candidates.length > 0}
     <ul bind:this={list_elem} class="suggestions">
         {#each candidates as candidate,i}

frontend/src/routes/accounting/add_entry.svelte

@@ -42,7 +42,10 @@
 	}
 
 	function focusOnEnter(ev,id){
-		if (ev.key == 'Enter') document.getElementById(id).focus();
+		if (ev.key == 'Enter') {
+			proposePurpose();
+			document.getElementById(id).focus();
+		}
 	}
 
 	async function getAccountTags(text){
@@ -93,6 +96,20 @@
 		}
 	}
 
+	async function proposePurpose(){
+		const source      = entry.source;
+		const destination = entry.destination;
+		const amount      = entry.amount;
+		const url         = api(`accounting/${account.id}/purposes`);
+		const res         = await post(url,{source,destination,amount});
+		if (res.ok) {
+			yikes();
+			var lastTransaction = await res.json();
+			entry.purpose       = { display: lastTransaction.purpose};
+			entry.tags          = lastTransaction.tags;
+		} else error(res);
+	}
+
 	async function save(){
 		let data = {
 			...entry,