SOLID Dependency invesion principle

/* Dependency Inversion Principle */

/* high level modules should not depend on low level modules */
/* abstractions should not depend on details */

// make transitions/changes is really hard in high level modules,so we should instead creade intermdiate api that wraps around low level module(f.e. Stripe)

// Good - we didnt have to change any code inside Shop, because we have payment processor interface, that allowing us to not have to change any of store code
// all we have to do is create new payment processor, wrapping the API (Paypal, Stripe) we want to use and pass that into the new store()






/* BAD */
 class Shop {
  constructor(user) {
    //this.stripe = new Stripe(user);

    // payment with paypal impl
    this.paypal = new Paypal()
    this.user = user
  }

  purchaseBike(quantity) {
    //this.stripe.makePayment(200 * quantity * 100)

    // payment with paypal impl
    this.paypal.makePayment(this.user, 200 * quantity)

  }

  purchaseHelmet(quantity) {
    //this.stripe.makePayment(15 * quantity * 100)

    // payment with paypal impl
    this.paypal.makePayment(this.user, 15 * quantity)
  }
}

class Stripe {
  constructor(user) {
    this.user = user
  }

  makePayment(amountInCents) {
    console.log(`${this.user} made payment of  $${amountInCents / 100} with Stripe`)
  }
}

class Paypal {
  makePayment(user, amountInDollars) {
    console.log(`${user} made payment of $${amountInDollars} with Paypal`)
  }
}

const shop = new Shop('John')
shop.purchaseBike(2)
shop.purchaseHelmet(2)



/* GOOD */
class Shop {
    constructor(paymentProcessor) {
    this.paymentProcessor = paymentProcessor;
  }

  purchaseBike(quantity) {
    this.paymentProcessor.pay(200 * quantity)
  }

  purchaseHelmet(quantity) {
    this.paymentProcessor.pay(15 * quantity)
  }
}

class StripePaymentProcessor {
    constructor(user) {
    this.stripe = new Stripe(user)
  }

  pay(amountInDollars) {
    this.stripe.makePayment(amountInDollars * 100)
  }
}

class PaypalPaymentProcessor {
    constructor(user) {
    this.user = user
    this.paypal = new Paypal()
  }

  pay(amountInDollars) {
    this.paypal.makePayment(this.user, amountInDollars)
  }
}


class Stripe {
    constructor(user) {
    this.user = user
  }

  makePayment(amountInCents) {
    console.log(`${this.user} made payment of  $${amountInCents / 100} with Stripe`)
  }
}

class Paypal {
    makePayment(user, amountInDollars) {
    console.log(`${user} made payment of $${amountInDollars} with Paypal`)
  }
}

/* const shop = new Shop(new StripePaymentProcessor("John")) */
const shop = new Shop(new PaypalPaymentProcessor("John"))
shop.purchaseBike(2)
shop.purchaseHelmet(2)