settable-by.ts
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settable-by.ts
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	import Field, {
	type ExtractFieldDecoded,
	type ExtractFieldInput,
	type ExtractFieldStorage,
	HybridField,
	} from "../../../chip-types/field.js";
	import type { CollectionItem, Context } from "../../../main.js";
	import type Policy from "../../../chip-types/policy.js";

	export default class SettableBy<T extends Field<any, any>> extends HybridField<
	ExtractFieldInput<T>,
	ExtractFieldDecoded<T>,
	ExtractFieldStorage<T>,
	ExtractFieldInput<T>,
	ExtractFieldDecoded<T>,
	ExtractFieldStorage<T>,
	T
	> {
	typeName = "settable-by";
	policy: Policy;

	constructor(base_field: T, policy: Policy) {
	super(base_field);
	this.policy = policy;
	}

	async isProperValue(
	context: Context,
	input: Parameters<T["encode"]>[1],
	old_value: Parameters<T["encode"]>[2],
	_blessing: unknown,
	item: CollectionItem \| undefined
	) {
	const result = await this.policy.check(
	context,
	item ? async () => item : undefined
	);
	if (result && !result.allowed) {
	return Field.invalid(result.reason);
	}
	return this.virtual_field.checkValue(
	context,
	input,
	old_value,
	null,
	item
	);
	}
	}