import {
    it,
    describe,
} from 'mocha'
import {
    Connection,
    Keypair,
    PublicKey,
    sendAndConfirmTransaction,
    SystemProgram,
    Transaction,
} from '@solana/web3.js'
import {
    AddCarArgs,
    Car,
    RentalOrder,
    RentalOrderStatus,
    createAddCarInstruction,
    createBookRentalInstruction,
    createPickUpCarInstruction,
    createReturnCarInstruction,
} from './generated'


function loadKeypairFromFile(path: string): Keypair {
    return Keypair.fromSecretKey(
        Buffer.from(JSON.parse(require('fs').readFileSync(path, "utf-8")))
    )
}

const carBmw: AddCarArgs = {
    year: 2020,
    make: 'BMW',
    model: 'iX1',
}

const carMercedes: AddCarArgs = {
    year: 2019,
    make: 'Mercedes-Benz',
    model: 'EQS',
}

const rentalInfo = {
    name: "Fred Flinstone",
    pickUpDate: "01/28/2023 8:00 AM",
    returnDate: "01/28/2023 10:00 PM",
    price: 300,
}


describe("Car Rental Service", () => {

    const connection = new Connection(`https://api.devnet.solana.com`, 'confirmed')
    const payer = loadKeypairFromFile(require('os').homedir() + '/.config/solana/id.json')
    const program = loadKeypairFromFile('./program/target/deploy/car_rental_service-keypair.json')

    let bmwPublicKey: PublicKey
    let mercedesPublicKey: PublicKey

    async function createCar(car: AddCarArgs): Promise<PublicKey> {
        const carAccountPublicKey = PublicKey.findProgramAddressSync(
            [
                Buffer.from('car'),
                Buffer.from(car.make),
                Buffer.from(car.model),
            ],
            program.publicKey,
        )[0]
        const ix = createAddCarInstruction(
            {
                carAccount: carAccountPublicKey,
                payer: payer.publicKey,
                systemProgram: SystemProgram.programId,
            },
            { addCarArgs: { ...car } },
        )
        const sx = await sendAndConfirmTransaction(
            connection,
            new Transaction().add(ix),
            [payer],
            { skipPreflight: true }
        )
        await connection.confirmTransaction(sx)
        const carData = await Car.fromAccountAddress(connection, carAccountPublicKey)
        console.log('New car created:')
        console.log(`   Year    : ${carData.year}`)
        console.log(`   Make    : ${carData.make}`)
        console.log(`   Model   : ${carData.model}`)
        return carAccountPublicKey
    }
    it("Create a car that can be rented", async () => { bmwPublicKey = await createCar(carBmw) })
    it("Create another car that can be rented", async () => { mercedesPublicKey = await createCar(carMercedes) })

    const evaluateStatus = (status: RentalOrderStatus): string => {
        if (status === RentalOrderStatus.Created) return "Created"
        if (status === RentalOrderStatus.PickedUp) return "Picked Up"
        return "Returned"
    }

    async function printRentalDetails(rentalPublicKey: PublicKey, carPublicKey: PublicKey) {
        const rentalData = await RentalOrder.fromAccountAddress(connection, rentalPublicKey)
        const carData = await Car.fromAccountAddress(connection, carPublicKey)
        console.log('Rental booked:')
        console.log('   Vehicle details:')
        console.log(`       Year    : ${carData.year}`)
        console.log(`       Make    : ${carData.make}`)
        console.log(`       Model   : ${carData.model}`)
        console.log(`   Name    : ${rentalData.name}`)
        console.log(`   Pick Up : ${rentalData.pickUpDate}`)
        console.log(`   Return  : ${rentalData.returnDate}`)
        console.log(`   Price   : ${rentalData.price}`)
        console.log(`   Status  : ${evaluateStatus(rentalData.status)}`)
    }

    it("Book a new rental", async () => {
        const rentalAccountPublicKey = PublicKey.findProgramAddressSync(
            [
                Buffer.from('rental_order'),
                bmwPublicKey.toBuffer(),
                payer.publicKey.toBuffer(),
            ],
            program.publicKey,
        )[0]
        const ix = createBookRentalInstruction(
            {
                rentalAccount: rentalAccountPublicKey,
                carAccount: bmwPublicKey,
                payer: payer.publicKey,
                systemProgram: SystemProgram.programId,
            },
            {
                bookRentalArgs: { ...rentalInfo }
            },
        )
        const sx = await sendAndConfirmTransaction(
            connection,
            new Transaction().add(ix),
            [payer]
        )
        await connection.confirmTransaction(sx)
        await printRentalDetails(rentalAccountPublicKey, bmwPublicKey)
    })

    it("Pick up your rental car", async () => {
        const rentalAccountPublicKey = PublicKey.findProgramAddressSync(
            [
                Buffer.from('rental_order'),
                bmwPublicKey.toBuffer(),
                payer.publicKey.toBuffer(),
            ],
            program.publicKey,
        )[0]
        const ix = createPickUpCarInstruction(
            {
                rentalAccount: rentalAccountPublicKey,
                carAccount: bmwPublicKey,
                payer: payer.publicKey,
            }
        )
        const sx = await sendAndConfirmTransaction(
            connection,
            new Transaction().add(ix),
            [payer]
        )
        await connection.confirmTransaction(sx)
        await printRentalDetails(rentalAccountPublicKey, bmwPublicKey)
    })

    it("Return your rental car", async () => {
        const rentalAccountPublicKey = PublicKey.findProgramAddressSync(
            [
                Buffer.from('rental_order'),
                bmwPublicKey.toBuffer(),
                payer.publicKey.toBuffer(),
            ],
            program.publicKey,
        )[0]
        const ix = createReturnCarInstruction(
            {
                rentalAccount: rentalAccountPublicKey,
                carAccount: bmwPublicKey,
                payer: payer.publicKey,
            }
        )
        const sx = await sendAndConfirmTransaction(
            connection,
            new Transaction().add(ix),
            [payer]
        )
        await connection.confirmTransaction(sx)
        await printRentalDetails(rentalAccountPublicKey, bmwPublicKey)
    })
  })