import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
import { Text } from "@earendil-works/pi-tui";
import type { ClassifiedError } from "./correct.ts";

const ENTRY_TYPE = "english-note";

export interface EnglishNoteData {
	errors: ClassifiedError[];
}

/** Renders a dim, out-of-band note. registerEntryRenderer entries never enter LLM context. */
export function registerEnglishNoteRenderer(pi: ExtensionAPI): void {
	pi.registerEntryRenderer<EnglishNoteData>(ENTRY_TYPE, (entry, _options, theme) => {
		const errors = entry.data?.errors ?? [];
		if (errors.length === 0) return undefined;

		const lines = [
			theme.fg("dim", "[english]"),
			...errors.map((e) => theme.fg("dim", `  ${e.original} → ${e.corrected}  (${e.category})`)),
		];

		return new Text(lines.join("\n"), 0, 0);
	});
}

export function appendEnglishNote(pi: ExtensionAPI, errors: ClassifiedError[]): void {
	pi.appendEntry<EnglishNoteData>(ENTRY_TYPE, { errors });
}