/**
 * Utility functions for the sub-bar extension
 */

import type { Dependencies, RateWindow } from "./types.js";
import { normalizeTokens } from "@eiei114/pi-sub-shared";

// Only allow simple CLI names (no spaces/paths) to avoid unsafe command execution.
const SAFE_CLI_NAME = /^[a-zA-Z0-9._-]+$/;

/**
 * Format a reset date as a relative time string
 */
export function formatReset(date: Date): string {
	const diffMs = date.getTime() - Date.now();
	if (diffMs < 0) return "now";

	const diffMins = Math.floor(diffMs / 60000);
	if (diffMins < 60) return `${diffMins}m`;

	const hours = Math.floor(diffMins / 60);
	const mins = diffMins % 60;
	if (hours < 24) return mins > 0 ? `${hours}h${mins}m` : `${hours}h`;

	const days = Math.floor(hours / 24);
	const remHours = hours % 24;
	return remHours > 0 ? `${days}d${remHours}h` : `${days}d`;
}

/**
 * Format elapsed time since a timestamp (milliseconds)
 */
export function formatElapsedSince(timestamp: number): string {
	const diffMs = Date.now() - timestamp;
	if (diffMs < 60000) return "just now";

	const diffMins = Math.floor(diffMs / 60000);
	if (diffMins < 60) return `${diffMins}m`;

	const hours = Math.floor(diffMins / 60);
	const mins = diffMins % 60;
	if (hours < 24) return mins > 0 ? `${hours}h${mins}m` : `${hours}h`;

	const days = Math.floor(hours / 24);
	const remHours = hours % 24;
	return remHours > 0 ? `${days}d${remHours}h` : `${days}d`;
}

/**
 * Strip ANSI escape codes from a string
 */
export function stripAnsi(text: string): string {
	 
	return text.replace(/\x1B\[[0-9;?]*[A-Za-z]|\x1B\].*?\x07/g, "");
}

/**
 * Reorder usage windows so those matching the active model come first.
 * A window matches when every model-ID token appears in the window label
 * AND the model tokens form a strict majority of the label tokens.
 * The majority check prevents a short model name (e.g. "gpt-5.3") from
 * falsely matching a longer, more specific label (e.g. "GPT-5.3-Codex-Spark 5h").
 * Non-matching windows keep their original relative order.
 */
export function prioritizeWindowsForModel(
	windows: RateWindow[],
	model?: { id?: string } | null,
): RateWindow[] {
	if (!model?.id || windows.length <= 1) return windows;

	const modelTokens = normalizeTokens(model.id);
	if (modelTokens.length === 0) return windows;

	const matched: RateWindow[] = [];
	const rest: RateWindow[] = [];

	for (const window of windows) {
		const labelTokens = normalizeTokens(window.label);
		const isMatch = modelTokens.every((token) => labelTokens.includes(token))
			&& modelTokens.length * 2 > labelTokens.length;
		if (isMatch) {
			matched.push(window);
		} else {
			rest.push(window);
		}
	}

	if (matched.length === 0 || matched.length === windows.length) return windows;

	return [...matched, ...rest];
}

/**
 * Check if a command exists in PATH
 */
export function whichSync(cmd: string, deps: Dependencies): string | null {
	if (!SAFE_CLI_NAME.test(cmd)) {
		return null;
	}

	try {
		return deps.execFileSync("which", [cmd], { encoding: "utf-8" }).trim();
	} catch {
		return null;
	}
}

/**
 * Create an abort controller with a timeout
 */
export function createTimeoutController(timeoutMs: number): { controller: AbortController; clear: () => void } {
	const controller = new AbortController();
	const timeoutId = setTimeout(() => controller.abort(), timeoutMs);
	return {
		controller,
		clear: () => clearTimeout(timeoutId),
	};
}