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

	export class NumberField<
	DefaultValue extends number \| null = number,
	Required extends boolean = boolean
	> extends FormField<Required, number \| DefaultValue> {
	constructor(
	required: Required,
	public default_value: DefaultValue,
	public options: Partial<{
	max: number;
	min: number;
	decimalDigits: number;
	}> = {}
	) {
	super(required);
	}

	predicate = predicates.number;

	public async isValueValid(_: Context, value: unknown) {
	if (
	(is(value, predicates.string) &&
	!isNaN(parseFloat(value)) &&
	parseFloat(value).toString() == value.trim()) \|\|
	is(value, predicates.number) \|\|
	((is(value, predicates.undefined) \|\| value == "") && !this.required)
	) {
	return { valid: true, message: "" };
	}
	return { valid: false, message: "Proszę wprowadzić liczbę" };
	}

	async parse(
	_: Context,
	value: FormDataValue
	): Promise<FieldParseResult<number>> {
	if (
	(is(value, predicates.string) &&
	!isNaN(parseFloat(value)) &&
	parseFloat(value).toString() == value.trim()) \|\|
	is(value, predicates.number)
	) {
	return {
	parsable: true,
	parsed_value: this.options.decimalDigits
	? parseFloat(
	parseFloat(value.toString()).toFixed(
	this.options.decimalDigits
	)
	)
	: parseFloat(value.toString()),
	error: null,
	};
	} else {
	return {
	parsable: false,
	parsed_value: null,
	error: "Please enter a number",
	};
	}
	}

	public getEmptyValue(): DefaultValue {
	return this.default_value;
	}
	}