/**
 * Configuration for Nostr services
 * Handles environment variables and defaults
 */

const DEFAULT_RELAYS = [
  'wss://theforest.nostr1.com',
  'wss://thecitadel.nostr1.com',
  'wss://nostr.land'
];

const PROFILE_RELAYS = [
  'wss://relay.damus.io',
  'wss://aggr.nostr.land',
  'wss://profiles.nostr1.com',
  'wss://relay.primal.net',
  'wss://nostr.wine',
  'wss://nostr21.com'
];

const THREAD_PUBLISH_RELAYS = [
  'wss://thecitadel.nostr1.com'
];

const GIF_RELAYS = [
  "wss://relay.damus.io",
  "wss://relay.primal.net",
  "wss://relay.gifbuddy.lol",
  "wss://thecitadel.nostr1.com"
];

const RELAY_TIMEOUT = 10000;

// Fetch limits
const FEED_LIMIT = 100; // Standard limit for feed events per kind
const SINGLE_EVENT_LIMIT = 1; // For fetching a single event
const SMALL_BATCH_LIMIT = 20; // For small batches (interactions, etc.)
const MEDIUM_BATCH_LIMIT = 50; // For medium batches
const LARGE_BATCH_LIMIT = 200; // For large batches (comments, etc.)
const VERY_LARGE_BATCH_LIMIT = 500; // For very large batches

// Fetch timeouts (in milliseconds)
const SHORT_TIMEOUT = 2000; // Short timeout for cache-heavy operations
const STANDARD_TIMEOUT = 3000; // Standard timeout for most operations
const MEDIUM_TIMEOUT = 5000; // Medium timeout for profile/standard operations
const LONG_TIMEOUT = 10000; // Long timeout for important operations
const SINGLE_RELAY_TIMEOUT = 15000; // Timeout for single relay operations

export interface NostrConfig {
  defaultRelays: string[];
  profileRelays: string[];
  threadTimeoutDays: number;
  threadPublishRelays: string[];
  relayTimeout: number;
  gifRelays: string[];
  // Fetch limits
  feedLimit: number;
  singleEventLimit: number;
  smallBatchLimit: number;
  mediumBatchLimit: number;
  largeBatchLimit: number;
  veryLargeBatchLimit: number;
  // Fetch timeouts
  shortTimeout: number;
  standardTimeout: number;
  mediumTimeout: number;
  longTimeout: number;
  singleRelayTimeout: number;
}

function parseRelays(envVar: string | undefined, fallback: string[]): string[] {
  if (!envVar) return fallback;
  const relays = envVar
    .split(',')
    .map((r) => r.trim())
    .filter((r) => r.length > 0);
  return relays.length > 0 ? relays : fallback;
}

function parseIntEnv(envVar: string | undefined, fallback: number, min: number = 0): number {
  if (!envVar) return fallback;
  const parsed = parseInt(envVar, 10);
  if (isNaN(parsed) || parsed < min) return fallback;
  return parsed;
}

export function getConfig(): NostrConfig {
  return {
    defaultRelays: parseRelays(import.meta.env.VITE_DEFAULT_RELAYS, DEFAULT_RELAYS),
    profileRelays: PROFILE_RELAYS,
    threadTimeoutDays: parseIntEnv(import.meta.env.VITE_THREAD_TIMEOUT_DAYS, 30),
    threadPublishRelays: THREAD_PUBLISH_RELAYS,
    relayTimeout: RELAY_TIMEOUT,
    gifRelays: GIF_RELAYS,
    // Fetch limits
    feedLimit: parseIntEnv(import.meta.env.VITE_FEED_LIMIT, FEED_LIMIT, 1),
    singleEventLimit: SINGLE_EVENT_LIMIT,
    smallBatchLimit: SMALL_BATCH_LIMIT,
    mediumBatchLimit: MEDIUM_BATCH_LIMIT,
    largeBatchLimit: LARGE_BATCH_LIMIT,
    veryLargeBatchLimit: VERY_LARGE_BATCH_LIMIT,
    // Fetch timeouts
    shortTimeout: SHORT_TIMEOUT,
    standardTimeout: STANDARD_TIMEOUT,
    mediumTimeout: MEDIUM_TIMEOUT,
    longTimeout: LONG_TIMEOUT,
    singleRelayTimeout: SINGLE_RELAY_TIMEOUT
  };
}

export const config = getConfig();