import "dotenv/config";

import { promises as fs } from "node:fs";
import path from "node:path";

import { getIngestConfigFromEnv } from "../src/lib/config";
import { createCacheFromEnv } from "../src/lib/cache";
import { cachedCompute } from "../src/lib/cache/memoize";
import type { ContentCache, ContentItem } from "../src/lib/content/types";
import { readInstagramEmbedPosts } from "../src/lib/ingest/instagram";
import { fetchPodcastRss } from "../src/lib/ingest/podcast";
import { fetchWordpressContent } from "../src/lib/ingest/wordpress";
import { fetchYoutubeViaApi, fetchYoutubeViaRss } from "../src/lib/ingest/youtube";

function log(msg: string) {
  // simple, cron-friendly logs
  // eslint-disable-next-line no-console
  console.log(`[fetch-content] ${msg}`);
}

async function writeAtomic(filePath: string, content: string) {
  const tmpPath = `${filePath}.tmp`;
  await fs.mkdir(path.dirname(filePath), { recursive: true });
  await fs.writeFile(tmpPath, content, "utf8");
  await fs.rename(tmpPath, filePath);
}

function dedupe(items: ContentItem[]): ContentItem[] {
  const seen = new Set<string>();
  const out: ContentItem[] = [];
  for (const it of items) {
    const k = `${it.source}:${it.id}`;
    if (seen.has(k)) continue;
    seen.add(k);
    out.push(it);
  }
  return out;
}

async function main() {
  const cfg = getIngestConfigFromEnv(process.env);
  const generatedAt = new Date().toISOString();

  const all: ContentItem[] = [];
  const outPath = path.join(process.cwd(), "content", "cache", "content.json");

  const kv = await createCacheFromEnv(process.env, {
    namespace: "fast-website",
    log,
  });

  // Read the existing cache so we can keep last-known-good sections if a source fails.
  let existing: ContentCache | undefined;
  try {
    const raw = await fs.readFile(outPath, "utf8");
    existing = JSON.parse(raw) as ContentCache;
  } catch {
    existing = undefined;
  }

  // YouTube
  if (!cfg.youtubeChannelId) {
    log("YouTube: skipped (missing YOUTUBE_CHANNEL_ID)");
  } else if (cfg.youtubeApiKey) {
    try {
      const cacheKey = `youtube:api:${cfg.youtubeChannelId}:25`;
      const { value: items, cached } = await cachedCompute(kv, cacheKey, () =>
        fetchYoutubeViaApi(cfg.youtubeChannelId!, cfg.youtubeApiKey!, 25),
      );
      log(`YouTube: API ${cached ? "cache" : "live"} (${items.length} items)`);
      log(`YouTube: API ok (${items.length} items)`);
      all.push(...items);
    } catch (e) {
      log(`YouTube: API failed (${String(e)}), falling back to RSS`);
      const cacheKey = `youtube:rss:${cfg.youtubeChannelId}:25`;
      const { value: items, cached } = await cachedCompute(kv, cacheKey, () =>
        fetchYoutubeViaRss(cfg.youtubeChannelId!, 25),
      );
      log(`YouTube: RSS ${cached ? "cache" : "live"} (${items.length} items)`);
      log(`YouTube: RSS ok (${items.length} items)`);
      all.push(...items);
    }
  } else {
    const cacheKey = `youtube:rss:${cfg.youtubeChannelId}:25`;
    const { value: items, cached } = await cachedCompute(kv, cacheKey, () =>
      fetchYoutubeViaRss(cfg.youtubeChannelId!, 25),
    );
    log(`YouTube: RSS ${cached ? "cache" : "live"} (${items.length} items)`);
    log(`YouTube: RSS ok (${items.length} items)`);
    all.push(...items);
  }

  // Podcast
  if (!cfg.podcastRssUrl) {
    log("Podcast: skipped (missing PODCAST_RSS_URL)");
  } else {
    try {
      const cacheKey = `podcast:rss:${cfg.podcastRssUrl}:50`;
      const { value: items, cached } = await cachedCompute(kv, cacheKey, () =>
        fetchPodcastRss(cfg.podcastRssUrl!, 50),
      );
      log(`Podcast: RSS ${cached ? "cache" : "live"} (${items.length} items)`);
      log(`Podcast: RSS ok (${items.length} items)`);
      all.push(...items);
    } catch (e) {
      log(`Podcast: RSS failed (${String(e)})`);
    }
  }

  // Instagram (embed-first list)
  try {
    const filePath = path.isAbsolute(cfg.instagramPostUrlsFile)
      ? cfg.instagramPostUrlsFile
      : path.join(process.cwd(), cfg.instagramPostUrlsFile);
    const items = await readInstagramEmbedPosts(filePath);
    log(`Instagram: embed list ok (${items.length} items)`);
    all.push(...items);
  } catch (e) {
    log(`Instagram: embed list failed (${String(e)})`);
  }

  // WordPress (optional; powers /blog)
  let wordpress: ContentCache["wordpress"] = { posts: [], pages: [], categories: [] };
  if (!cfg.wordpressBaseUrl) {
    log("WordPress: skipped (missing WORDPRESS_BASE_URL)");
    wordpress = existing?.wordpress || wordpress;
  } else {
    try {
      const cacheKey = `wp:content:${cfg.wordpressBaseUrl}`;
      const { value: wp, cached } = await cachedCompute(kv, cacheKey, () =>
        fetchWordpressContent({
          baseUrl: cfg.wordpressBaseUrl!,
          username: cfg.wordpressUsername,
          appPassword: cfg.wordpressAppPassword,
        }),
      );
      log(
        `WordPress: wp-json ${cached ? "cache" : "live"} (${wp.posts.length} posts, ${wp.pages.length} pages, ${wp.categories.length} categories)`,
      );
      wordpress = wp;
      log(
        `WordPress: wp-json ok (${wp.posts.length} posts, ${wp.pages.length} pages, ${wp.categories.length} categories)`,
      );
    } catch (e) {
      log(`WordPress: wp-json failed (${String(e)})`);
      // Keep last-known-good WP content if present, otherwise fall back to empty.
      wordpress = existing?.wordpress || wordpress;
    }
  }

  const contentCache: ContentCache = {
    generatedAt,
    items: dedupe(all),
    wordpress,
  };

  await writeAtomic(outPath, JSON.stringify(contentCache, null, 2));
  log(`Wrote cache: ${outPath} (${contentCache.items.length} total items)`);

  await kv.close();
}

main().catch((e) => {
  log(`fatal: ${String(e)}`);
  process.exitCode = 1;
});