export const API_KEY_PREFIX = "imemio_";

export function generateApiKey(): string {
	const randomBytes = new Uint8Array(16);

	crypto.getRandomValues(randomBytes);

	const hexString = Array.from(randomBytes)
		.map((byte) => byte.toString(16).padStart(2, "0"))
		.join("");

	return `${API_KEY_PREFIX}${hexString}`;
}

export function extractKeyPrefix(apiKey: string): string {
	if (!apiKey.startsWith(API_KEY_PREFIX)) {
		throw new Error("Invalid API key format");
	}

	return apiKey.slice(API_KEY_PREFIX.length, API_KEY_PREFIX.length + 8);
}

export async function hashApiKey(apiKey: string): Promise<string> {
	const encoder = new TextEncoder();
	const data = encoder.encode(apiKey);
	const hashBuffer = await crypto.subtle.digest("SHA-256", data);
	const hashArray = Array.from(new Uint8Array(hashBuffer));

	return hashArray.map((byte) => byte.toString(16).padStart(2, "0")).join("");
}

export function isValidApiKeyFormat(apiKey: string): boolean {
	if (!apiKey.startsWith(API_KEY_PREFIX)) {
		return false;
	}

	const keyPart = apiKey.slice(API_KEY_PREFIX.length);

	return keyPart.length === 32 && /^[0-9a-f]+$/i.test(keyPart);
}