import pg from "pg";

const { Pool } = pg;

const pool = new Pool({
  host: process.env.DATABASE_HOST || "172.17.0.1",
  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",
  max: 10,
  idleTimeoutMillis: 30000,
});

pool.on("error", (err) => {
  console.error("Unexpected PostgreSQL pool error:", err);
});

export async function initDatabase(): Promise<void> {
  const client = await pool.connect();
  try {
    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("PostgreSQL tables initialized");
  } finally {
    client.release();
  }
}

export { pool };
export default pool;