dchain/client-app/lib/devSeedFeed.ts

/**
 * Dev-only mock posts for the feed.
 *
 * Why: in __DEV__ before any real posts exist on the node, the timeline/
 * for-you/trending tabs come back empty. Empty state is fine visually but
 * doesn't let you test scrolling, like animations, view-counter bumps,
 * navigation to post detail, etc. This module injects a small set of
 * synthetic posts so the UI has something to chew on.
 *
 * Gating:
 *  - Only active when __DEV__ === true (stripped from production builds).
 *  - Only surfaces when the REAL API returns an empty array. If the node
 *    is returning actual posts, we trust those and skip the mocks.
 *
 * These posts have made-up post_ids — tapping on them to open detail
 * WILL 404 against the real backend. That's intentional — the mock is
 * purely for scroll / tap-feedback testing.
 */
import type { FeedPostItem } from './feed';

// Fake hex-like pubkeys so Avatar's colour hash still looks varied.
function fakeAddr(seed: number): string {
  const h = (seed * 2654435761).toString(16).padStart(8, '0');
  return (h + h + h + h).slice(0, 64);
}

function fakePostID(n: number): string {
  return `dev${String(n).padStart(29, '0')}`;
}

const NOW = Math.floor(Date.now() / 1000);

// Small curated pool of posts covering the render surface we care about:
// plain text, hashtag variety, different lengths, likes / views spread,
// reply/quote references, one with an attachment marker.
const SEED_POSTS: FeedPostItem[] = [
  {
    post_id:    fakePostID(1),
    author:     fakeAddr(1),
    content:    'Добро пожаловать в ленту DChain. Это #DEV-посты — они видны только пока реальная лента пустая.',
    created_at: NOW - 60,
    size:       200,
    hosting_relay: fakeAddr(100),
    views: 127, likes: 42,
    has_attachment: false,
    hashtags: ['dev'],
  },
  {
    post_id:    fakePostID(2),
    author:     fakeAddr(2),
    content:    'Пробую новую ленту #twitter-style. Лайки, просмотры, подписки — всё on-chain, тела постов — off-chain в mailbox релея.',
    created_at: NOW - 540,
    size:       310,
    hosting_relay: fakeAddr(100),
    views: 89, likes: 23,
    has_attachment: false,
    hashtags: ['twitter'],
  },
  {
    post_id:    fakePostID(3),
    author:     fakeAddr(3),
    content:    'Сжатие изображений — максимальное на клиенте (WebP Q=50 @1080p), плюс серверный EXIF-скраб через stdlib re-encode. GPS-координаты из EXIF больше никогда не утекают. #privacy',
    created_at: NOW - 1200,
    size:       420,
    hosting_relay: fakeAddr(100),
    views: 312, likes: 78,
    has_attachment: true,
    hashtags: ['privacy'],
  },
  {
    post_id:    fakePostID(4),
    author:     fakeAddr(4),
    content:    'Короткий пост.',
    created_at: NOW - 3600,
    size:       128,
    hosting_relay: fakeAddr(100),
    views: 12, likes: 3,
    has_attachment: false,
  },
  {
    post_id:    fakePostID(5),
    author:     fakeAddr(1),
    content:    'Отвечаю сам себе — фича threads пока через reply_to только, без UI thread-виджета.',
    created_at: NOW - 7200,
    size:       220,
    hosting_relay: fakeAddr(100),
    views: 45, likes: 11,
    has_attachment: false,
    reply_to: fakePostID(1),
  },
  {
    post_id:    fakePostID(6),
    author:     fakeAddr(5),
    content:    '#golang + #badgerdb + #libp2p = DChain бэкенд. Пять package в test suite, все зелёные.',
    created_at: NOW - 10800,
    size:       180,
    hosting_relay: fakeAddr(100),
    views: 201, likes: 66,
    has_attachment: false,
    hashtags: ['golang', 'badgerdb', 'libp2p'],
  },
  {
    post_id:    fakePostID(7),
    author:     fakeAddr(6),
    content:    'Feed-mailbox хранит тела постов до 30 дней (настраиваемо через DCHAIN_FEED_TTL_DAYS). Потом BadgerDB выселяет автоматически — chain-метаданные остаются навсегда.',
    created_at: NOW - 14400,
    size:       380,
    hosting_relay: fakeAddr(100),
    views: 156, likes: 48,
    has_attachment: false,
  },
  {
    post_id:    fakePostID(8),
    author:     fakeAddr(7),
    content:    'Pricing: BasePostFee = 1000 µT (0.001 T) + 1 µT за каждый байт. Уходит владельцу релея, принявшего пост.',
    created_at: NOW - 21600,
    size:       250,
    hosting_relay: fakeAddr(100),
    views: 78, likes: 22,
    has_attachment: false,
  },
  {
    post_id:    fakePostID(9),
    author:     fakeAddr(8),
    content:    'Twitter-like, но без миллиардов долларов на инфраструктуру — каждый оператор ноды платит за свой кусок хостинга и зарабатывает на публикациях. #decentralised #messaging',
    created_at: NOW - 43200,
    size:       340,
    hosting_relay: fakeAddr(100),
    views: 412, likes: 103,
    has_attachment: false,
    hashtags: ['decentralised', 'messaging'],
  },
  {
    post_id:    fakePostID(10),
    author:     fakeAddr(9),
    content:    'Короче. Лайк = on-chain tx с fee 1000 µT. Дорого для спама, дёшево для реального лайка. Пока без батчинга, но в плане. #design',
    created_at: NOW - 64800,
    size:       200,
    hosting_relay: fakeAddr(100),
    views: 92, likes: 29,
    has_attachment: false,
    hashtags: ['design'],
  },
  {
    post_id:    fakePostID(11),
    author:     fakeAddr(2),
    content:    'Follow граф на chain: двусторонний индекс (forward + inbound), так что Followers() и Following() — оба O(M).',
    created_at: NOW - 86400 - 1000,
    size:       230,
    hosting_relay: fakeAddr(100),
    views: 61, likes: 14,
    has_attachment: false,
  },
  {
    post_id:    fakePostID(12),
    author:     fakeAddr(10),
    content:    'Рекомендации (For You): берём последние 48ч постов, фильтруем подписки + уже лайкнутые + свои, ранжируем по likes × 3 + views. Версия 1 — будет умнее. #recsys',
    created_at: NOW - 129600,
    size:       290,
    hosting_relay: fakeAddr(100),
    views: 189, likes: 58,
    has_attachment: false,
    hashtags: ['recsys'],
  },
];

/** True when the current build is a Metro dev bundle. __DEV__ is a
 * global injected by Metro at bundle time and typed via react-native's
 * ambient declarations, so no ts-ignore is needed. */
function isDev(): boolean {
  return typeof __DEV__ !== 'undefined' && __DEV__ === true;
}

/**
 * Returns the dev-seed post list (only in __DEV__). Called by the Feed
 * screen as a fallback when the real API returned an empty list.
 */
export function getDevSeedFeed(): FeedPostItem[] {
  if (!isDev()) return [];
  return SEED_POSTS;
}