Begin working on the migration script upon world load for Actors

module/migrations/v3.0.0.mjs

@@ -0,0 +1,72 @@
+import { Logger } from "../utils/Logger.mjs";
+import { migrateCollection, shouldMigrateCompendium } from "./utils.mjs";
+
+const flag = `convertAttributesIntoItems`;
+const operations = [];
+
+export async function migrateTo3_0_0() {
+	Logger.debug(`Starting v3.0.0 data migration`);
+
+	operations.push(
+		...await migrateCollection(
+			game.actors,
+			flag,
+			handleMigratingActor,
+			{ update: false, },
+		),
+	);
+
+	// for (const pack of game.packs) {
+	// 	if (
+	// 		pack.metadata.type !== "Actor"
+	// 		|| !shouldMigrateCompendium(pack)
+	// 	) {
+	// 		continue;
+	// 	};
+
+	// 	await pack.getDocuments();
+
+	// 	// TODO: unlock compendium if required then re-lock after finishing
+	// 	await migrateCollection(
+	// 		pack,
+	// 		flag,
+	// 		handleMigratingActor,
+	// 		{ pack },
+	// 	);
+	// };
+
+	// TODO: create the item documents (batch them if possible)
+	Logger.debug(`Finished v3.0.0 migration, resulting operations:`);
+	console.log(operations);
+};
+
+function handleMigratingActor(actor) {
+	console.log(actor);
+
+	const operation = {
+		action: `create`,
+		documentName: `Item`,
+		parent: actor,
+		data: [],
+	};
+
+	const attrs = actor.system.attr;
+	for (const [ key, attr ] of Object.entries(attrs)) {
+		operation.data.push(convertToItem(key, attr));
+	};
+	operations.push(operation);
+
+	return null;
+};
+
+function convertToItem(key, attr) {
+	return {
+		name: attr.name,
+		type: "attribute",
+		system: {
+			key,
+			value: attr.value,
+			max: attr.isRange ? attr.max : null,
+		},
+	};
+};