import bcrypt from 'bcryptjs';
import crypto from 'crypto';
import { db } from '@/lib/db';
import type { User } from '@prisma/client';

// ─── Password Hashing ─────────────────────────────────────────────────────────

export async function hashPassword(password: string): Promise<string> {
  return bcrypt.hash(password, 12);
}

export async function verifyPassword(
  password: string,
  hash: string
): Promise<boolean> {
  return bcrypt.compare(password, hash);
}

// ─── Session Management ───────────────────────────────────────────────────────

export function generateSessionToken(): string {
  return crypto.randomBytes(32).toString('hex');
}

export async function createSession(userId: string): Promise<string> {
  const token = generateSessionToken();
  const expiresAt = new Date(Date.now() + 7 * 24 * 60 * 60 * 1000); // 7 days

  await db.session.create({
    data: {
      token,
      userId,
      expiresAt,
    },
  });

  return token;
}

export async function getSessionUser(token: string): Promise<User | null> {
  if (!token) return null;

  const session = await db.session.findUnique({
    where: { token },
    include: { user: true },
  });

  if (!session) return null;
  if (new Date() > session.expiresAt) {
    await db.session.delete({ where: { id: session.id } });
    return null;
  }

  return session.user;
}

export async function deleteSession(token: string): Promise<void> {
  if (!token) return;
  await db.session.deleteMany({ where: { token } });
}

// ─── Cookie Helpers ───────────────────────────────────────────────────────────

const SESSION_COOKIE_NAME = 'op_session';

export function getCookieToken(request: Request): string | null {
  const cookieHeader = request.headers.get('cookie');
  if (!cookieHeader) return null;

  const match = cookieHeader.match(
    new RegExp(`(?:^|;\\s*)${SESSION_COOKIE_NAME}=([^;]*)`)
  );
  return match ? decodeURIComponent(match[1]) : null;
}

export { SESSION_COOKIE_NAME };

// ─── API Key Generation ───────────────────────────────────────────────────────

export function generateApiKey(): string {
  const randomHex = crypto.randomBytes(24).toString('hex');
  return `op_live_${randomHex}`;
}

// ─── Plan Constants ───────────────────────────────────────────────────────────

export const PLAN_LIMITS: Record<string, number> = {
  free: 20,
  basic: 200,
  pro: 2000,
  enterprise: Infinity,
};

export const PLAN_LABELS: Record<string, string> = {
  free: 'Free',
  basic: 'Basic',
  pro: 'Pro',
  enterprise: 'Enterprise',
};

export const PLAN_PRICES: Record<string, number> = {
  free: 0,
  basic: 29,
  pro: 129,
  enterprise: 499,
};