import * as plugins from './paypal.plugins';
import { PayPalTransaction } from './paypal.classes.transaction';

export interface IPayPalOptions {
  clientId: string;
  clientSecret: string;
  accountOwner: string;
}

export class PayPalAccount {
  public apiBaseUrl: string = 'https://api.paypal.com';
  public options: IPayPalOptions;

  private apiToken: string;
  private apiTokenExpirationTime: number;

  constructor(optionsArg: IPayPalOptions) {
    this.options = optionsArg;
  }

  public async getTransactionsFromTo(fromTimeMillisArg: number, toTimeMillisArg: number) {
    let allTransactions: PayPalTransaction[] = [];
    // lets note the time from one month before. We need that for accurate transactions pools.
    const monthBeforeStartMillis =
      fromTimeMillisArg - plugins.smarttime.getMilliSecondsFromUnits({ days: 30 });
    do {
      const transactions = await PayPalTransaction.getTransactionFor30days(this, fromTimeMillisArg);
      allTransactions = allTransactions.concat(transactions);
      fromTimeMillisArg =
        fromTimeMillisArg + plugins.smarttime.getMilliSecondsFromUnits({ days: 30 });
    } while (fromTimeMillisArg < toTimeMillisArg);

    const invoiceIds: string[] = [];
    const transactionPools: PayPalTransaction[][] = [];
    // lets get all invoiceids
    allTransactions.forEach((transactionArg) => {
      const invoiceId = transactionArg.data.originApiObject.transaction_info.invoice_id;
      if (!invoiceIds.includes(invoiceId)) {
        invoiceIds.push(invoiceId);
      }
    });

    // lets get all transactions per invoiceId
    invoiceIds.forEach((invoiceIdArg) => {
      const transactionPool: PayPalTransaction[] = [];
      allTransactions.forEach((transactionArg) => {
        if (transactionArg.data.originApiObject.transaction_info.invoice_id === invoiceIdArg) {
          transactionPool.push(transactionArg);
        }
      });
      transactionPools.push(transactionPool);
    });

    const previousMonthTransactions = await PayPalTransaction.getTransactionFor30days(
      this,
      monthBeforeStartMillis
    );

    transactionPools.forEach((transactionPoolArg) => {
      const poolInvoiceId = transactionPoolArg[0].data.originApiObject.transaction_info.invoice_id;
      previousMonthTransactions.forEach((transactionArg) => {
        if (transactionArg.data.originApiObject.transaction_info.invoice_id === poolInvoiceId) {
          transactionPoolArg.push(transactionArg);
        }
      });
    });

    let finalTransactions: PayPalTransaction[] = [];
    // lets process all transactionPool
    transactionPools.forEach((transactionPoolArg) => {
      // lets detect foreign transactions
      let hasForeignTransactions = false;
      transactionPoolArg.forEach((transactionArg) => {
        if (transactionArg.data.currency !== 'EUR') {
          hasForeignTransactions = true;
        }
      });
      if (hasForeignTransactions && transactionPoolArg.length < 4) {
        console.log(
          `Pool with invoiceId ${transactionPoolArg[0].data.originApiObject.transaction_info.invoice_id} is not completed yet. Omminiting ${transactionPoolArg.length} transactions as a result.`
        );
        return;
      }
      if (hasForeignTransactions && transactionPoolArg.length === 4) {
        const negativeNativeTransaction = transactionPoolArg.find(transactionArg => {
          return transactionArg.data.amount < 0 && transactionArg.data.currency === 'EUR';
        });

        const negativeForeignTransaction = transactionPoolArg.find(transactionArg => {
          return transactionArg.data.amount < 0 && transactionArg.data.currency !== 'EUR';
        });

        const positiveNativeTransaction = transactionPoolArg.find(transactionArg => {
          return transactionArg.data.amount > 0 && transactionArg.data.currency === 'EUR';
        });

        const positiveForeignTransaction = transactionPoolArg.find(transactionArg => {
          return transactionArg.data.amount > 0 && transactionArg.data.currency !== 'EUR';
        });

        negativeNativeTransaction.data.name = negativeForeignTransaction.data.name;
        negativeNativeTransaction.data.description = negativeForeignTransaction.data.description;
        positiveNativeTransaction.data.name = this.options.accountOwner;
        positiveNativeTransaction.data.description = 'account balance transfer';
        transactionPoolArg = transactionPoolArg.filter(transactionArg => transactionArg.data.currency === 'EUR');
      }
      if (!hasForeignTransactions && transactionPoolArg.length === 2) {
        const positiveNativeTransaction = transactionPoolArg.find(transactionArg => {
          return transactionArg.data.amount > 0 && transactionArg.data.currency === 'EUR';
        });
        positiveNativeTransaction.data.name = this.options.accountOwner;
        positiveNativeTransaction.data.description = 'account balance transfer';
      }
      // pool is ready
      finalTransactions = finalTransactions.concat(transactionPoolArg);
    });

    return finalTransactions;
  }

  public async request(methodArg: 'GET' | 'POST', routeArg: string, payloadArg: any) {
    if (!this.apiToken || this.apiTokenExpirationTime < Date.now()) {
      const authHeader = `Basic ${plugins.smartstring.base64.encode(
        `${this.options.clientId}:${this.options.clientSecret}`
      )}`;
      const response = await plugins.smartrequest.request(
        `${this.apiBaseUrl}/v1/oauth2/token?grant_type=client_credentials`,
        {
          method: 'POST',
          headers: {
            Accept: 'application/json',
            'Accept-Language': 'en_US',
            Authorization: authHeader,
          },
          keepAlive: false,
        }
      );
      this.apiToken = response.body.access_token;
      this.apiTokenExpirationTime = Date.now() + response.body.expires_in * 1000 - 600000;
    }

    // we have a token
    const response = await plugins.smartrequest.request(`${this.apiBaseUrl}${routeArg}`, {
      method: 'GET',
      headers: {
        Accept: 'application/json',
        'Accept-Language': 'en_US',
        Authorization: `Bearer ${this.apiToken}`,
      },
    });
    return response.body;
  }
}