import { Context } from "koa";
import merge from "merge";
import { FormDataValue } from "../forms/form-types.js";
import type { BasePageProps } from "./list.js";

export type EncodedProps = Record<string, unknown>;

// page props parser is only tasked with getting the raw props from *somewhere*
// and being able to put new values back to that somewhere. Parsing to numbers
// or any other exotic types is done by fields logic.

export abstract class PagePropsParser<PropsType> {
	abstract decode(ctx: Context): Record<string, FormDataValue>;
	abstract encode(props: Record<string, FormData>): EncodedProps;
	abstract getHTMLInputName(prop_name: string): string;

	overwriteProp(ctx: Context, new_props: Partial<PropsType>): EncodedProps {
		const result = {};
		merge.recursive(result, this.decode(ctx), new_props);
		return result;
	}
}

export class AllQueryParams<
	PropsType extends BasePageProps,
> extends PagePropsParser<PropsType> {
	decode(ctx: Context): Record<string, FormDataValue> {
		return ctx.query;
	}

	encode(props: PropsType): Record<string, unknown> {
		return props;
	}

	getHTMLInputName(prop_name: string): string {
		return prop_name;
	}
}