pick-from-list.ts
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pick-from-list.ts
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	import { is, predicates } from "@sealcode/ts-predicates";
	import { Context } from "koa";
	import type { DropdownOption } from "../controls/dropdown.js";
	import { FormFieldValidationResponse } from "./field.js";
	import { SimpleFormField } from "./simple-form-field.js";

	export class PickFromListField<
	Required extends boolean
	> extends SimpleFormField<Required> {
	constructor(
	public required: Required,
	public generateOptions: (ctx: Context) => Promise<DropdownOption[]>,
	public customValidation: (
	ctx: Context,
	value: unknown,
	instance: PickFromListField<Required>
	) => Promise<FormFieldValidationResponse> = (ctx, value, instance) =>
	instance.valueInList(ctx, value)
	) {
	super(required);
	}

	predicate = predicates.string;

	public isValueValid(
	ctx: Context,
	value: string
	): Promise<FormFieldValidationResponse> {
	return this.customValidation(ctx, value, this);
	}

	async valueInList(
	ctx: Context,
	value: unknown
	): Promise<FormFieldValidationResponse> {
	const options = await this.generateOptions(ctx);
	if (!is(value, predicates.string)) {
	return { valid: false, message: "not a string" };
	}
	if (this.required && !options.map((o) => o.value).includes(value)) {
	return {
	valid: false,
	message: `"${value}" is not one of the options`,
	};
	}
	return { valid: true, message: "" };
	}

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