class BikeRentalService {
  constructor(name, location) {
    this.name = name;
    this.location = location;
    this.availableBikes = [];
  }

  addBikes(bikes) {
    const bikesTemp = [];
    bikes.map(bike => {

        const props = bike.split('-');
        const bikeBrand = props[0];
        const bikeQuantity = Number(props[1]);
        const bikePrice = props[2];
        const bikeFound = this.availableBikes.find(x => x.brand === bikeBrand);
        const foundIndex = this.availableBikes.findIndex(x => x.brand === bikeBrand)
        if(bikeFound && bikeFound.quantity < bikeQuantity) {
            this.availableBikes[foundIndex].quantity += bikeQuantity;
            this.availableBikes[foundIndex].price = bikePrice;
        } else {
            this.availableBikes.push({brand: bikeBrand, quantity: Number(bikeQuantity), price: bikePrice})
            bikesTemp.push(bikeBrand);
        }
    })
    return `Successfully added ${bikesTemp.join(', ')}`
  }

  rentBikes(selectedBikes) {
    let totalPrice = 0;
    for(let i = 0; i < selectedBikes.length; i++) {
        const props = selectedBikes[i].split('-');
        const bikeBrand = props[0];
        const bikeQuantity = Number(props[1]);
        const bikeFound = this.availableBikes.find(x => x.brand === bikeBrand);
        const foundIndex = this.availableBikes.findIndex(x => x.brand === bikeBrand)

        if(!bikeFound || (bikeFound && bikeFound.quantity < bikeQuantity)) {
            return "Some of the bikes are unavailable or low on quantity in the bike rental service."
        } else {
            totalPrice += bikeQuantity * parseFloat(bikeFound.price)
            this.availableBikes[foundIndex].quantity -= bikeQuantity;
        }
    }

    return `Enjoy your ride! You must pay the following amount $${(Math.round(totalPrice * 100) / 100).toFixed(2)}.`
  }

  returnBikes (returnedBikes) {
    for(let i = 0; i < returnedBikes.length; i++) {
        const props = returnedBikes[i].split('-');
        const bikeBrand = props[0];
        const bikeQuantity = Number(props[1]);
        const bikeFound = this.availableBikes.find(x => x.brand === bikeBrand);
        const foundIndex = this.availableBikes.findIndex(x => x.brand === bikeBrand)

        if(!bikeFound) {
            return "Some of the returned bikes are not from our selection."
        } else {
            this.availableBikes[foundIndex].quantity += bikeQuantity;
        }
    }

    return "Thank you for returning!";
  }

  revision() {
    let output = `Available bikes:\n`;
    this.availableBikes.sort(compare).map(bike => {
        output += `${bike.brand} quantity:${bike.quantity} price:$${bike.price}\n`;
    })
    output += `The name of the bike rental service is ${this.name}, and the location is ${this.location}.`;

    return output;
  }
}

function compare( a, b ) {
    if ( a.quantity < b.quantity ){
      return 1;
    }
    if ( a.quantity > b.quantity ){
      return -1;
    }
    return 0;
  }