// Provenance: G4brym/workers-research  (vuln).
// repo: G4brym/workers-research
// commit: eab923ad3099c01b002fbd6be7cf994614bbdee4
// parent: eab923ad3099c01b002fbd6be7cf994614bbdee4
// commit_url: https://github.com/G4brym/workers-research/commit/209444eb61cc564c2d6b43267256f85fe3e5e30e
// cve: 
// license: MIT
// function: normalizeDomain
// relpath: src/utils.ts
// provenance: agent
// mechanism: source_reaches_sink

import {
	createGoogleGenerativeAI,
	type GoogleGenerativeAIProvider,
	type GoogleGenerativeAIProviderSettings,
} from "@ai-sdk/google";
import type { Env } from "./bindings";

function getGoogleProvider(env: Env): GoogleGenerativeAIProvider {
	const args: GoogleGenerativeAIProviderSettings = {
		apiKey: env.GOOGLE_API_KEY,
	};

	if (env.AI_GATEWAY_ACCOUNT_ID && env.AI_GATEWAY_NAME) {
		args.baseURL = `https://gateway.ai.cloudflare.com/v1/${env.AI_GATEWAY_ACCOUNT_ID}/${env.AI_GATEWAY_NAME}/google-ai-studio/v1beta`;

		if (env.AI_GATEWAY_API_KEY) {
			args.headers = {
				"cf-aig-authorization": `Bearer ${env.AI_GATEWAY_API_KEY}`,
			};
		}
	}

	return createGoogleGenerativeAI(args);
}

export function getModel(env: Env) {
	const google = getGoogleProvider(env);

	return google("gemini-2.0-flash-exp");
}

export function getFallbackModel(env: Env) {
	const google = getGoogleProvider(env);
	return google("gemini-2.0-flash");
}

export function getModelThinking(env: Env) {
	const google = getGoogleProvider(env);

	return google("gemini-2.0-flash-exp");
}

export function timeAgo(date: Date): string {
	const now = new Date();
	const seconds = Math.floor((now.getTime() - date.getTime()) / 1000);

	const intervals: [number, string][] = [
		[60, "minute"],
		[60, "hour"],
		[24, "day"],
		[7, "week"],
		[4.35, "month"],
		[12, "year"],
	];

	let count = seconds;
	let unit = "second";

	for (const [interval, name] of intervals) {
		if (count < interval) break;
		count /= interval;
		unit = name;
	}

	count = Math.floor(count);
	return `${count} ${unit}${count !== 1 ? "s" : ""} ago`;
}

export async function sleep(ms: number): Promise<void> {
	return new Promise((resolve) => setTimeout(resolve, ms));
}

/**
 * Normalize a domain input for excluded domain matching.
 * Handles common user input formats:
 * - Full URLs: "https://reddit.com/foo" → "reddit.com"
 * - www prefix: "www.reddit.com" → "reddit.com"
 * - Mixed: "https://www.reddit.com" → "reddit.com"
 * - Plain domains are returned as-is (lowercased, trimmed)
 */
export function normalizeDomain(input: string): string {
	let domain = input.trim().toLowerCase();
	if (domain.length === 0) return "";

	// If it looks like a URL (has ://), extract the hostname
	if (domain.includes("://")) {
		try {
			domain = new URL(domain).hostname;
		} catch {
			// If URL parsing fails, strip the protocol manually
			domain = domain.replace(/^[a-z]+:\/\//, "").split("/")[0];
		}
	} else {
		// Strip any trailing path from plain domain input
		domain = domain.split("/")[0];
	}

	// Strip www. prefix for consistent matching
	domain = domain.replace(/^www\./, "");

	return domain;
}

export function formatDuration(ms: number): string {
	// Handle negative or zero values
	if (ms <= 0) {
		return "0.0 seconds";
	}

	const seconds = ms / 1000;
	const minutes = seconds / 60;
	const hours = minutes / 60;
	const days = hours / 24;

	// Determine the appropriate unit and format with one decimal place
	if (days >= 1) {
		return `${days.toFixed(1)} day${days !== 1 ? "s" : ""}`;
	} else if (hours >= 1) {
		return `${hours.toFixed(1)} hour${hours !== 1 ? "s" : ""}`;
	} else if (minutes >= 1) {
		return `${minutes.toFixed(1)} minute${minutes !== 1 ? "s" : ""}`;
	} else {
		return `${seconds.toFixed(1)} second${seconds !== 1 ? "s" : ""}`;
	}
}