page.ts
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page.ts
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	import Router from "@koa/router";
	import { Context } from "koa";

	import { FlatTemplatable, tempstream } from "tempstream";
	import type { FormDataValue } from "../forms/form-types.js";
	import {
	Fields,
	MountableWithFields,
	PageErrorMessage,
	} from "./mountable-with-fields.js";
	import { AllQueryParams, PagePropsParser } from "./props-parser.js";

	export abstract class Page<
	F extends Fields = Record<string, never>
	> extends MountableWithFields<F> {
	propsParser: PagePropsParser<Record<keyof Fields, unknown>> =
	new AllQueryParams();
	controls = [];

	mount(router: Router, path: string): void {
	router.get(path, async (ctx) => {
	ctx.body = await this.render(ctx);
	});
	}

	// eslint-disable-next-line @typescript-eslint/no-unused-vars
	async canAccess(_: Context) {
	return { canAccess: true, message: "" };
	}

	async renderError(
	_: Context,
	error: PageErrorMessage
	): Promise<FlatTemplatable> {
	return tempstream/* HTML */ `<div>${error.message}</div>`;
	}

	public abstract render(ctx: Context): Promise<FlatTemplatable>;

	async extractRawValues(
	ctx: Context
	): Promise<Record<string, FormDataValue>> {
	return this.propsParser.decode(ctx) \|\| {};
	}
	}