import {TabbyPurchaseType} from '../constants/payment';
import {CheckoutSession, TabbyCheckoutPayload} from '../constants/payment';
import {getVersionHeader} from './utils/headers';

export type TabbySession = {
  sessionId: string;
  paymentId: string;
  availableProducts: TabbyProduct[];
  rejectionReason?: string; // Optional, if the session is not available
};

export enum TabbyEnv {
  STAGING = 'dev',
  PRODUCTION = 'ai',
}

export type TabbyProduct = {
  type: TabbyPurchaseType;
  webUrl: string;
};

class TabbyRN {
  private env: TabbyEnv = TabbyEnv.PRODUCTION;
  get apiHost() {
    return `https://api.tabby.${this.env}/api/v2/checkout`;
  }
  get widgetsUrl() {
    return `https://widgets.tabby.${this.env}/tabby-promo.html`;
  }
  private apiKey: string | null = null;

  public setApiKey(apiKey: string, env: TabbyEnv = TabbyEnv.PRODUCTION) {
    this.apiKey = apiKey;
    this.env = env;
  }

  public async createSession(
    payload: TabbyCheckoutPayload,
  ): Promise<TabbySession> {
    if (!this.apiKey) {
      console.error('TABBY_API_KEY is not set');
      console.error(
        "Call Tabby.setApiKey('your_public_key') before calling Tabby.createSession()",
      );
      throw new Error('API Key is not set');
    }
    const response = await fetch(`${this.apiHost}`, {
      method: 'POST',
      headers: {
        Accept: 'application/json',
        'Content-Type': 'application/json',
        'X-SDK-Version': getVersionHeader(),
        Authorization: `Bearer ${this.apiKey}`,
      },
      body: JSON.stringify(payload),
    });

    if (response.ok) {
      const checkoutSession: CheckoutSession = await response.json();
      const {
        id,
        configuration: {available_products, products},
        payment,
      } = checkoutSession;
      const availableProducts: TabbyProduct[] = [];
      if (available_products.installments) {
        const [installmentsPlan] = available_products.installments;
        if (installmentsPlan) {
          availableProducts.push({
            type: 'installments',
            webUrl: installmentsPlan.web_url,
          });
        }
      }
      const result: TabbySession = {
        sessionId: id,
        paymentId: payment.id,
        availableProducts,
        rejectionReason: products.installments?.rejection_reason,
      };
      return result;
    } else {
      throw new Error('Error creating session');
    }
  }
}

const Tabby = new TabbyRN();
export {Tabby};