🚴‍♂️ Bike Rental Smart Contract

This is a decentralized smart contract for renting bikes using Ethereum blockchain technology. It allows users to rent bikes by paying a deposit, automatically calculates rental fees based on time, and returns the remaining deposit upon the bike's return. Perfect for a decentralized bike-sharing system!

Key Features

• Register New Bikes: Only the owner can register new bikes.
• Rent a Bike: Users can rent any available bike with a deposit (minimum 3000 wei).
• Return the Bike: Renters can return bikes and get their deposit back minus the rental fee.
• Track Bike Availability: View all available bikes that can be rented.
• Check Rented Bikes: Renters can see which bikes they've rented, and the owner can view all rented bikes.

How It Works

• Deposit: To rent a bike, users need to deposit at least 3000 wei.
• Distance Calculation: The contract generates a random distance between 50 to 100 units when the bike is returned.
• Rental Fee: The rental fee is calculated based on time, using a randomly determined rate per minute (between 1 to 5 wei), plus a base fee of 1 wei.
• Speed Calculation: The average speed of the bike is also calculated after return, adding a fun element to the rental experience.

Testing

• Tested on the Sepolia Test Network using Remix IDE for contract deployment and MetaMask for transactions.

Core Functions

Function	How It Works
rentBike(bikeId)	Rent a bike by providing its bikeId. A deposit of at least 3000 wei is required.
returnBike(bikeId)	Return the bike with the given bikeId. The contract deducts the rental fee and refunds the remaining deposit. It also calculates the average speed of the bike.
getAvailableBikes()	Returns a list of all bikes that are available for rent.
getMyrentedBikes()	Allows the current user to view the list of bikes they've rented.
getAllRentedBikes()	Allows the owner to view a list of all rented bikes.
registerBike()	Registers a new bike in the system. This function can only be called by the owner.

Usage Example

• Deploy the contract with an initial number of bikes (e.g., constructor(numberOfBikes)).
• Rent a bike using rentBike(bikeId) and deposit the required amount.
• Return the bike with returnBike(bikeId) to receive the remaining deposit minus the rental fee.

Specifications and Assumptions