import { inspect } from "node:util";
import { keyHint, type ToolRenderers } from "@earendil-works/pi-coding-agent";
import { Text } from "@earendil-works/pi-tui";

function object(value: unknown): Record<string, unknown> | undefined {
	return value !== null && typeof value === "object" && !Array.isArray(value)
		? (value as Record<string, unknown>)
		: undefined;
}

function label(value: unknown, limit = 80): string {
	return typeof value === "string"
		? value.replace(/\p{Cc}/gu, " ").slice(0, limit)
		: "";
}

function details(value: unknown): string {
	const text = inspect(value, {
		depth: 6,
		maxArrayLength: 32,
		maxStringLength: 16384,
		colors: false,
		customInspect: false,
		getters: false,
	});
	return text.length > 16384
		? `${text.slice(0, 16384)}\n[Expanded display truncated]`
		: text;
}

function summary(value: unknown): string {
	const data = object(value);
	if (!data) return "finished";
	if (Array.isArray(data["ephemlets"]))
		return `${data["ephemlets"].length} ephemlet${data["ephemlets"].length === 1 ? "" : "s"}`;
	if (typeof data["deleted"] === "string")
		return `deleted ${label(data["deleted"])}`;
	if (typeof data["visible"] === "boolean")
		return `${data["visible"] ? "shown" : "hidden"}${data["selected"] ? ` · ${label(data["selected"])}` : ""}`;
	return (
		[
			label(data["title"]),
			label(data["id"]),
			label(data["status"]),
			typeof data["revision"] === "number" ? `r${data["revision"]}` : "",
			data["jobId"] ? `job ${label(data["jobId"])}` : "",
		]
			.filter(Boolean)
			.join(" · ") || "finished"
	);
}

export const ephemletRenderers: ToolRenderers = {
	renderCall(args, theme, context) {
		const text =
			context.lastComponent instanceof Text
				? context.lastComponent
				: new Text("", 0, 0);
		const data = object(args);
		let output = `${theme.fg("toolTitle", theme.bold("ephemlet"))} ${theme.fg("toolOutput", [label(data?.["action"]), label(data?.["title"] ?? data?.["id"])].filter(Boolean).join(" · "))}`;
		output += context.expanded
			? `\n${theme.fg("toolOutput", details(args))}`
			: theme.fg("dim", ` (${keyHint("app.tools.expand", "to expand")})`);
		text.setText(output);
		return text;
	},
	renderResult(result, { expanded, isPartial }, theme, context) {
		const text =
			context.lastComponent instanceof Text
				? context.lastComponent
				: new Text("", 0, 0);
		const status = context.isError
			? "failed"
			: isPartial
				? "working"
				: summary(result.details);
		let output = theme.fg(context.isError ? "error" : "toolOutput", status);
		output += expanded
			? `\n${theme.fg("toolOutput", details(context.isError ? result.content : (result.details ?? result.content)))}`
			: theme.fg("dim", ` (${keyHint("app.tools.expand", "to expand")})`);
		text.setText(output);
		return text;
	},
};