import { Pool } from "pg";

const pool = new Pool({
  connectionString: process.env.DATABASE_URL,
});

/**
 * Check if any users exist in the database
 */
export async function hasUsers(): Promise<boolean> {
  try {
    const result = await pool.query('SELECT COUNT(*) as count FROM "user"');
    return parseInt(result.rows[0].count) > 0;
  } catch (error) {
    // Table might not exist yet
    return false;
  }
}

/**
 * Create the default super-admin user from environment variables
 */
export async function createDefaultAdmin(): Promise<boolean> {
  const email = process.env.DEFAULT_ADMIN_EMAIL;
  const name = process.env.DEFAULT_ADMIN_NAME || "System Administrator";

  if (!email) {
    console.warn("DEFAULT_ADMIN_EMAIL not set, skipping admin creation");
    return false;
  }

  try {
    // Check if user already exists
    const existing = await pool.query(
      'SELECT id FROM "user" WHERE email = $1',
      [email]
    );

    if (existing.rows.length > 0) {
      console.log("Default admin already exists");
      return false;
    }

    // Create the admin user
    const id = crypto.randomUUID();
    await pool.query(
      `INSERT INTO "user" (id, name, email, role, email_verified, requires_setup, created_at, updated_at)
       VALUES ($1, $2, $3, 'super-admin', false, true, NOW(), NOW())`,
      [id, name, email]
    );

    console.log(`Created default admin: ${email}`);
    return true;
  } catch (error) {
    console.error("Failed to create default admin:", error);
    return false;
  }
}

/**
 * Run bootstrap checks and setup
 */
export async function bootstrap(): Promise<void> {
  try {
    const usersExist = await hasUsers();
    
    if (!usersExist) {
      console.log("No users found, running initial setup...");
      await createDefaultAdmin();
    }
  } catch (error) {
    console.error("Bootstrap failed:", error);
  }
}

/**
 * Check if a user requires setup (has requires_setup flag)
 */
export async function userRequiresSetup(userId: string): Promise<boolean> {
  try {
    const result = await pool.query(
      'SELECT requires_setup FROM "user" WHERE id = $1',
      [userId]
    );
    return result.rows[0]?.requires_setup === true;
  } catch (error) {
    return false;
  }
}

/**
 * Clear the requires_setup flag for a user
 */
export async function clearSetupFlag(userId: string): Promise<void> {
  try {
    await pool.query(
      'UPDATE "user" SET requires_setup = false, updated_at = NOW() WHERE id = $1',
      [userId]
    );
  } catch (error) {
    console.error("Failed to clear setup flag:", error);
  }
}