import fetch from 'node-fetch';
import uuid from 'uuid/v4';
import crypto from 'crypto';

export default class Modular{
    async createAccount() {
        const body = JSON.stringify({
            type: 'INDIVIDUAL',
            tcsVersion: 0,
            expectedMonthlySpend: 0
        });
        const hmac = this.hmac();
        var res = await fetch(process.env.modularApiUrl+'/customers', {
            method:"POST",
            headers: {
                'Date': hmac.date,
                'x-mod-nonce': hmac.nonce,
                'Authorization': hmac.authorization,
                'Content-Type': 'application/json',
            },
            body
        });
        if(res.status === 200)
            return await res.json();
        else
            console.error(await res.text())
        return null;
    }
    hmac(){
        const date = (new Date()).toUTCString();
        const nonce = uuid();
        const signatureString = `date: ${date}\nx-mod-nonce: ${nonce}`;

        console.log("Signature string: "+signatureString);
        console.log("Secret: "+ process.env.modulrApiHmacSecret)
        const signature = crypto.createHmac('sha1', process.env.modulrApiHmacSecret
        ).update(signatureString).digest('base64');

        console.log("Signature: "+ JSON.stringify(signature));
        const base64Signnature = signature.toString('base64');
        console.log("Base64 signature: " + base64Signnature);
        const encodedSignature = encodeURIComponent(base64Signnature);
        console.log("Encoded signature: " + encodedSignature);
        const authorization = `Signature keyId="${process.env.modulrApiKey}",algorithm="hmac-sha1",headers="date x-mod-nonce",signature="${encodedSignature}"`
        console.log("Authorization header: "+authorization);

        return {
            date,
            nonce,
            authorization
        }
    }
}