Add bulk create voucher option

src/routes/admin/api/transactions.js

@@ -108,3 +108,28 @@ export async function editVoucher(id, code, amount, activated, expiresAt){
 		}
 	});
 }
+
+function generateRandomString(forbidden=new Set(), length=14, chars="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"){
+	let result = "";
+	for(let i = 0; i < length; i++){
+		result += chars.charAt(Math.floor(Math.random() * chars.length));
+	}
+	if(forbidden.has(result)) return generateRandomString(length, chars, forbidden);
+	else return result;
+}
+export async function bulkCreateVouchers(amount, value, expiresAt){
+	const existingCodes = new Set((await db.voucher.findMany({select: {code: true}})).map(voucher => voucher.code));
+	const codes = [];
+	for(let i = 0; i < amount; i++){
+		const code = generateRandomString(existingCodes);
+		existingCodes.add(code);
+		codes.push(code);
+	}
+	return db.$transaction(codes.map(code => db.voucher.create({
+		data: {
+			code,
+			amount: value,
+			expiresAt
+		}
+	})));
+}

src/routes/admin/vouchers/+page.server.js

-import { createVoucher, editVoucher, getVouchers } from "../api/transactions"
+import { bulkCreateVouchers, createVoucher, editVoucher, getVouchers } from "../api/transactions"
 
 export const load = async ()=>{
 	const vouchers = await getVouchers();
@@ -28,5 +28,16 @@ export const actions = {
 		if(!id || !code || !amount || Number.isNaN(amount) || amount < 0 || isNaN(expiresDate)) return { error: "Invalid form data" };
 		const voucher = await editVoucher(id, code, amount, active, expiresDate);
 		return { voucher };
+	},
+	bulk: async event => {
+		const data = await event.request.formData();
+		const amount = parseInt(data.get('amount'));
+		const value = parseInt(data.get('value'));
+		const expiresAt = data.get('expiresAt');
+		const expiresDate = expiresAt ? new Date(expiresAt) : null;
+		if(!amount || !value || Number.isNaN(amount) || Number.isNaN(value) || amount < 1 || value < 1 || isNaN(expiresDate)) return { error: "Invalid form data" };
+		if(expiresDate && expiresDate < Date.now()) return { error: "Expiration date must be in the future" };
+		const vouchers = await bulkCreateVouchers(amount, value, expiresDate);
+		return { vouchers };
 	}
 };

src/routes/admin/vouchers/VoucherList.svelte

@@ -5,6 +5,7 @@
 	
 	export let vouchers;
 	let edit = vouchers.map(() => false);
+	let lastBulkCreated = [];
 </script>
 
 <table>
@@ -74,3 +75,34 @@
 		}
 	};
 }}></form>
+
+<h3>Bulk Create</h3>
+<form method="post" action="?/bulk" use:enhance={({form, data, cancel})=>{
+	const expiresAt = data.get("expiresAt");
+	if(expiresAt){
+		data.set("expiresAt", new Date(expiresAt).toISOString());
+	}
+	return async ({result})=>{
+		if(result.data?.vouchers){
+			form.reset();
+			vouchers = [...vouchers, ...result.data.vouchers];
+			edit = [...edit, ...result.data.vouchers.map(() => false)];
+			lastBulkCreated = result.data.vouchers;
+			addMessage(MessageType.SUCCESS, "Gutscheine wurden erstellt");
+		}else{
+			addMessage(MessageType.ERROR, "Gutscheine konnten nicht erstellt werden");
+			console.error(result);
+		}
+	}
+}}>
+	<label>Anzahl: <input name="amount" type="number" step="1" min="1" required /></label><br>
+	<label>Wert: <input name="value" type="number" step="1" min="1" required /></label><br>
+	<label>Gültig bis: <input name="expiresAt" type="datetime-local" /></label><br>
+	<button type="submit">Erstellen</button>
+</form>
+{#if lastBulkCreated.length > 0}
+	<button on:click={()=>{
+		navigator.clipboard.writeText(lastBulkCreated.map(voucher => voucher.code).join("\n"));
+		addMessage(MessageType.SUCCESS, "Codes wurden kopiert");
+	}}>Codes kopieren</button>
+{/if}