/**
 * seed-cc-essays.ts — Push all five "Essays on Śrī Caitanya-caritāmṛta" into MongoDB.
 *
 * Uses the native MongoDB driver (same pattern as seed-te.ts) to avoid
 * Prisma replica-set write requirements.
 *
 * Collections written:
 *   - essays → 5 essay docs (upsert by slug)
 *
 * JSON sources:
 *   - lib/jsons/essays/the-spiritual-masters.json
 *   - lib/jsons/essays/the-absolute-truth.json
 *   - lib/jsons/essays/causes-of-lord-caitanyas-incarnation.json
 *   - lib/jsons/essays/confidential-reasons-for-lord-caitanyas-appearance.json
 *   - lib/jsons/essays/glories-of-lord-nityananda.json
 *
 * Usage:
 *   npx tsx scripts/seed-cc-essays.ts
 */

import dotenv from "dotenv";
import fs from "fs";
import path from "path";
import { MongoClient } from "mongodb";

// Load env
dotenv.config({ path: ".env.local" });
dotenv.config({ path: ".env" });

const DATABASE_URL = process.env.DATABASE_URL;
if (!DATABASE_URL) {
  console.error("❌ DATABASE_URL is not set in .env");
  process.exit(1);
}

const BASE_DIR = path.resolve(__dirname, "..");
const ESSAYS_DIR = path.join(BASE_DIR, "lib", "jsons", "essays");

const ESSAY_FILES = [
  "the-spiritual-masters.json",
  "the-absolute-truth.json",
  "causes-of-lord-caitanyas-incarnation.json",
  "confidential-reasons-for-lord-caitanyas-appearance.json",
  "glories-of-lord-nityananda.json",
];

// ---------------------------------------------------------------------------
// Types
// ---------------------------------------------------------------------------

type EssayJson = {
  slug: string;
  title: string;
  author: string;
  year: number;
  group: string;
  order: number;
  paragraphs: string[];
};

// ---------------------------------------------------------------------------
// Helpers
// ---------------------------------------------------------------------------

function readJson<T>(filePath: string): T {
  return JSON.parse(fs.readFileSync(filePath, "utf-8"));
}

// ---------------------------------------------------------------------------
// Seed function
// ---------------------------------------------------------------------------

async function seedCcEssays(db: ReturnType<MongoClient["db"]>) {
  const essaysCol = db.collection("essays");

  let inserted = 0;
  let updated = 0;
  let unchanged = 0;

  for (const filename of ESSAY_FILES) {
    const jsonPath = path.join(ESSAYS_DIR, filename);

    if (!fs.existsSync(jsonPath)) {
      console.error(`  ❌ Missing: ${jsonPath}`);
      console.error("     Run `python3 scripts/cc_essays_extract.py` first.");
      process.exit(1);
    }

    const essay = readJson<EssayJson>(jsonPath);

    const result = await essaysCol.updateOne(
      { slug: essay.slug },
      {
        $set: {
          slug: essay.slug,
          title: essay.title,
          author: essay.author,
          year: essay.year,
          group: essay.group,
          order: essay.order,
          paragraphs: essay.paragraphs,
        },
      },
      { upsert: true },
    );

    if (result.upsertedCount > 0) {
      console.log(
        `  📝 Inserted "${essay.title}" (${essay.paragraphs.length} paragraphs)`,
      );
      inserted++;
    } else if (result.modifiedCount > 0) {
      console.log(
        `  📝 Updated "${essay.title}" (${essay.paragraphs.length} paragraphs)`,
      );
      updated++;
    } else {
      console.log(`  📝 "${essay.title}" already up to date`);
      unchanged++;
    }
  }

  // Verify
  const totalDocs = await essaysCol.countDocuments({
    group: "cc-essays",
  });
  console.log(
    `\n  ✅ Verified: ${totalDocs} document(s) in essays collection with group "cc-essays"`,
  );

  // Summary
  console.log(
    `\n  Summary: ${inserted} inserted, ${updated} updated, ${unchanged} unchanged`,
  );
}

// ---------------------------------------------------------------------------
// Main
// ---------------------------------------------------------------------------

async function main() {
  console.log("🌱 Seeding CC Essays (5 essays)...\n");

  const client = new MongoClient(DATABASE_URL!);
  await client.connect();
  console.log("📡 Connected to MongoDB\n");

  const db = client.db();

  const start = Date.now();

  await seedCcEssays(db);

  const elapsed = ((Date.now() - start) / 1000).toFixed(1);
  console.log(`\n🎉 Done in ${elapsed}s`);

  await client.close();
}

main().catch((err) => {
  console.error("❌ Seed failed:", err);
  process.exit(1);
});