import Stripe from 'stripe';
import {
  FREE_DYNAMIC_QR_LIMIT,
  PRO_DYNAMIC_QR_LIMIT,
  BUSINESS_DYNAMIC_QR_LIMIT,
} from '@/lib/plans';

// Use a placeholder during build time, real key at runtime
const stripeKey = process.env.STRIPE_SECRET_KEY || 'sk_test_placeholder_for_build';

export const stripe = new Stripe(stripeKey, {
  apiVersion: '2025-10-29.clover',
  typescript: true,
});

// Runtime validation (will throw when actually used in production if not set)
export function validateStripeKey() {
  if (!process.env.STRIPE_SECRET_KEY) {
    throw new Error('STRIPE_SECRET_KEY is not set');
  }
}

export const STRIPE_PLANS = {
  FREE: {
    name: 'Free / Starter',
    price: 0,
    currency: 'EUR',
    interval: 'month',
    features: [
      `${FREE_DYNAMIC_QR_LIMIT} dynamische QR-Codes`,
      'Basis-Tracking (Scans + Standort)',
      'Einfache Designs',
      'Unbegrenzte statische QR-Codes',
    ],
    limits: {
      dynamicQRCodes: FREE_DYNAMIC_QR_LIMIT,
      staticQRCodes: -1, // unlimited
      teamMembers: 1,
    },
    priceId: null, // No Stripe price for free plan
  },
  PRO: {
    name: 'Pro',
    price: 9,
    priceYearly: 90,
    currency: 'EUR',
    interval: 'month',
    features: [
      '50 QR Codes',
      'Branding (Colors)',
      'Detailed Analytics (Date, Device, City)',
      'CSV Export',
      'SVG/PNG Download',
    ],
    limits: {
      dynamicQRCodes: PRO_DYNAMIC_QR_LIMIT,
      staticQRCodes: -1,
      teamMembers: 1,
    },
    priceId: process.env.STRIPE_PRICE_ID_PRO_MONTHLY,
    priceIdYearly: process.env.STRIPE_PRICE_ID_PRO_YEARLY,
  },
  BUSINESS: {
    name: 'Business',
    price: 29,
    priceYearly: 290,
    currency: 'EUR',
    interval: 'month',
    features: [
      '500 QR-Codes',
      'Everything from Pro',
      'Bulk QR Generation (up to 1,000)',
      'Priority Support',
    ],
    limits: {
      dynamicQRCodes: BUSINESS_DYNAMIC_QR_LIMIT,
      staticQRCodes: -1,
      teamMembers: 1,
    },
    priceId: process.env.STRIPE_PRICE_ID_BUSINESS_MONTHLY,
    priceIdYearly: process.env.STRIPE_PRICE_ID_BUSINESS_YEARLY,
  },
} as const;

export type PlanType = keyof typeof STRIPE_PLANS;

export function getPlanFromStripePriceId(priceId?: string | null): Exclude<PlanType, 'FREE'> | null {
  if (!priceId) {
    return null;
  }

  if (
    priceId === process.env.STRIPE_PRICE_ID_BUSINESS_MONTHLY ||
    priceId === process.env.STRIPE_PRICE_ID_BUSINESS_YEARLY
  ) {
    return 'BUSINESS';
  }

  if (
    priceId === process.env.STRIPE_PRICE_ID_PRO_MONTHLY ||
    priceId === process.env.STRIPE_PRICE_ID_PRO_YEARLY
  ) {
    return 'PRO';
  }

  return null;
}