enum.ts
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enum.ts
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	import { is, predicates } from "@sealcode/ts-predicates";
	import { Context } from "koa";
	import { FormDataValue } from "../form";
	import { FieldParseResult, FormField } from "./field";

	export class EnumField<
	Options extends readonly string[],
	Required extends boolean
	> extends FormField<Required, string> {
	constructor(
	required: Required,
	public options: Options,
	public error_message: (options: Options) => string = (options) =>
	options.join(", ")
	) {
	super(required);
	}

	predicate = predicates.enum<Options>(this.options);

	public async isValueValid(
	_: Context,
	value: unknown
	): Promise<{ valid: boolean; message: string }> {
	if (!is(value, predicates.string)) {
	return { valid: false, message: "expected a string" };
	}
	if (this.options.includes(value)) {
	return { valid: true, message: "" };
	}
	return { valid: false, message: this.error_message(this.options) };
	}

	async parse(
	_: Context,
	value: FormDataValue
	): Promise<FieldParseResult<string>> {
	if (is(value, predicates.string)) {
	return {
	parsable: true,
	parsed_value: value,
	error: null,
	};
	} else {
	return {
	parsable: false,
	parsed_value: null,
	error: "Please enter a string",
	};
	}
	}

	public getEmptyValue(): string {
	return "";
	}
	}