#!/usr/bin/env node
/**
 * Migration script: JSON files → PostgreSQL
 * Run on the server where JSON data files exist.
 * Usage: DATABASE_PASSWORD=docfast node scripts/migrate-to-postgres.mjs
 */
import pg from "pg";
import { readFileSync, existsSync } from "fs";

const { Pool } = pg;

const pool = new Pool({
  host: process.env.DATABASE_HOST || "127.0.0.1",
  port: parseInt(process.env.DATABASE_PORT || "5432", 10),
  database: process.env.DATABASE_NAME || "docfast",
  user: process.env.DATABASE_USER || "docfast",
  password: process.env.DATABASE_PASSWORD || "docfast",
});

async function migrate() {
  const client = await pool.connect();
  try {
    // Create tables
    await client.query(`
      CREATE TABLE IF NOT EXISTS api_keys (
        key TEXT PRIMARY KEY,
        tier TEXT NOT NULL DEFAULT 'free',
        email TEXT NOT NULL DEFAULT '',
        created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
        stripe_customer_id TEXT
      );
      CREATE INDEX IF NOT EXISTS idx_api_keys_email ON api_keys(email);
      CREATE INDEX IF NOT EXISTS idx_api_keys_stripe ON api_keys(stripe_customer_id);

      CREATE TABLE IF NOT EXISTS verifications (
        id SERIAL PRIMARY KEY,
        email TEXT NOT NULL,
        token TEXT NOT NULL UNIQUE,
        api_key TEXT NOT NULL,
        created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
        verified_at TIMESTAMPTZ
      );
      CREATE INDEX IF NOT EXISTS idx_verifications_email ON verifications(email);
      CREATE INDEX IF NOT EXISTS idx_verifications_token ON verifications(token);

      CREATE TABLE IF NOT EXISTS pending_verifications (
        email TEXT PRIMARY KEY,
        code TEXT NOT NULL,
        created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
        expires_at TIMESTAMPTZ NOT NULL,
        attempts INT NOT NULL DEFAULT 0
      );

      CREATE TABLE IF NOT EXISTS usage (
        key TEXT PRIMARY KEY,
        count INT NOT NULL DEFAULT 0,
        month_key TEXT NOT NULL
      );
    `);
    console.log("✅ Tables created");

    // Migrate keys.json
    const keysPath = "/opt/docfast/data/keys.json";
    if (existsSync(keysPath)) {
      const keysData = JSON.parse(readFileSync(keysPath, "utf-8"));
      const keys = keysData.keys || [];
      let keyCount = 0;
      for (const k of keys) {
        await client.query(
          `INSERT INTO api_keys (key, tier, email, created_at, stripe_customer_id)
           VALUES ($1, $2, $3, $4, $5) ON CONFLICT (key) DO NOTHING`,
          [k.key, k.tier, k.email || "", k.createdAt, k.stripeCustomerId || null]
        );
        keyCount++;
      }
      console.log(`✅ Migrated ${keyCount} API keys`);
    } else {
      // Try docker volume path
      console.log("⚠️  keys.json not found at", keysPath);
    }

    // Migrate verifications.json
    const verifPath = "/opt/docfast/data/verifications.json";
    if (existsSync(verifPath)) {
      const data = JSON.parse(readFileSync(verifPath, "utf-8"));
      const verifications = Array.isArray(data) ? data : (data.verifications || []);
      const pending = data.pendingVerifications || [];

      let vCount = 0;
      for (const v of verifications) {
        await client.query(
          `INSERT INTO verifications (email, token, api_key, created_at, verified_at)
           VALUES ($1, $2, $3, $4, $5) ON CONFLICT (token) DO NOTHING`,
          [v.email, v.token, v.apiKey, v.createdAt, v.verifiedAt || null]
        );
        vCount++;
      }
      console.log(`✅ Migrated ${vCount} verifications`);

      let pCount = 0;
      for (const p of pending) {
        await client.query(
          `INSERT INTO pending_verifications (email, code, created_at, expires_at, attempts)
           VALUES ($1, $2, $3, $4, $5) ON CONFLICT (email) DO NOTHING`,
          [p.email, p.code, p.createdAt, p.expiresAt, p.attempts]
        );
        pCount++;
      }
      console.log(`✅ Migrated ${pCount} pending verifications`);
    } else {
      console.log("⚠️  verifications.json not found at", verifPath);
    }

    // Migrate usage.json
    const usagePath = "/opt/docfast/data/usage.json";
    if (existsSync(usagePath)) {
      const usageData = JSON.parse(readFileSync(usagePath, "utf-8"));
      let uCount = 0;
      for (const [key, record] of Object.entries(usageData)) {
        const r = record as any;
        await client.query(
          `INSERT INTO usage (key, count, month_key)
           VALUES ($1, $2, $3) ON CONFLICT (key) DO UPDATE SET count = $2, month_key = $3`,
          [key, r.count, r.monthKey]
        );
        uCount++;
      }
      console.log(`✅ Migrated ${uCount} usage records`);
    } else {
      console.log("⚠️  usage.json not found at", usagePath);
    }

    console.log("\n🎉 Migration complete!");
  } finally {
    client.release();
    await pool.end();
  }
}

migrate().catch((err) => {
  console.error("Migration failed:", err);
  process.exit(1);
});