const chai = require('chai')
chai.use(require('chai-as-promised'))
chai.should()
const { expect } = chai
const scrypt = require('..')

describe('hashing and verification', function () {
    it('works', async function () {
        const pass = 'b4dpa$s'
        const derived = await scrypt.hash(pass)
        const [cost, salt, key] = derived.split('.')
        cost.should.eq('e')
        salt.length.should.eq(32)
        key.length.should.eq(86)
        Buffer.from(key, 'base64url').length.should.eq(64)
        scrypt.verify(derived, pass).should.eventually.be.true
    })
})
describe('hashSync() and sync verification', function () {
    it('works', function () {
        const pass = 'b4dpa$s'
        const derived = scrypt.hashSync(pass)
        const [cost, salt, key] = derived.split('.')
        cost.should.eq('e')
        salt.length.should.eq(32)
        key.length.should.eq(86)
        Buffer.from(key, 'base64url').length.should.eq(64)
        scrypt.verifySync(derived, pass).should.be.true
    })
})

describe('hash() error cases', function () {
    it('throws an error when it receives an invalid cost value', async function () {
        scrypt.hash('bad password', { cost: 2.3 }).should.be.rejectedWith(scrypt.InvalidOptions)
        scrypt.hash('bad password', { cost: 2 /* too small */ }).should.be.rejectedWith(scrypt.InvalidOptions)
    })
    it('throws an error when it receives an invalid keyLength value', async function () {
        scrypt.hash('bad password', { keyLength: 2.3 }).should.be.rejectedWith(scrypt.InvalidOptions)
    })
    it('throws an error when it receives an invalid saltLength value', async function () {
        scrypt.hash('bad password', { saltLength: 2.3 }).should.be.rejectedWith(scrypt.InvalidOptions)
        scrypt.hash('bad password', { saltLength: 15 /* too small */ }).should.be.rejectedWith(scrypt.InvalidOptions)
    })
    it('throws an error when the password is not the right thing', function () {
        scrypt.hash(undefined).should.eventually.be.rejected
        scrypt.hash(null).should.eventually.be.rejected
        scrypt.hash(123.4).should.eventually.be.rejected
        scrypt.hash(NaN).should.eventually.be.rejected
        scrypt.hash(['some', 'arbitrary', 'values']).should.eventually.be.rejected
        scrypt.hash({ some: 'arbitrary values' }).should.eventually.be.rejected
        scrypt.hash(Symbol('something else')).should.eventually.be.rejected
        scrypt.hash(() => "no, you can't do this either").should.eventually.be.rejected
    })
})

describe('hashSync() error cases', function () {
    it('throws an error when it receives an invalid cost value', async function () {
        scrypt.hashSync.bind(undefined, 'bad password', { cost: 2.3 }).should.throw(scrypt.InvalidOptions)
        scrypt.hashSync.bind(undefined, 'bad password', { cost: 2 /* too small */ }).should.throw(scrypt.InvalidOptions)
    })
    it('throws an error when it receives an invalid keyLength value', async function () {
        scrypt.hashSync.bind(undefined, 'bad password', { keyLength: 2.3 }).should.throw(scrypt.InvalidOptions)
    })
    it('throws an error when it receives an invalid saltLength value', async function () {
        scrypt.hashSync.bind(undefined, 'bad password', { saltLength: 2.3 }).should.throw(scrypt.InvalidOptions)
        scrypt.hashSync.bind(undefined, 'bad password', { saltLength: 15 }).should.throw(scrypt.InvalidOptions)
    })
    it('throws an error when the password is not the right thing', function () {
        scrypt.hashSync.bind(undefined, undefined).should.throw()
        scrypt.hashSync.bind(undefined, null).should.throw()
        scrypt.hashSync.bind(undefined, 123.4).should.throw()
        scrypt.hashSync.bind(undefined, NaN).should.throw()
        scrypt.hashSync.bind(undefined, ['some', 'arbitrary', 'values']).should.throw()
        scrypt.hashSync.bind(undefined, { some: 'arbitrary values' }).should.throw()
        scrypt.hashSync.bind(undefined, Symbol('something else')).should.throw()
        scrypt.hashSync.bind(undefined, () => "no, you can't do this either").should.throw()
    })
})

describe('verify() error cases', function () {
    it('throws an error when the password is not the right thing', function () {
        const validHash = 'e.WCu8zB9FHLhXaAf5Svn7NE4ySqB5X45X.ZLpxVwLz1816kmshqXHn12X_4_lZD_0Yl-27KSLLzdhXJ0Fr2huSD7BvoMlBMOMUQBKyKXPzhKI01_Ot-C_w8g'
        scrypt.verify(validHash, undefined).should.eventually.be.rejected
        scrypt.verify(validHash, null).should.eventually.be.rejected
        scrypt.verify(validHash, 123.4).should.eventually.be.rejected
        scrypt.verify(validHash, NaN).should.eventually.be.rejected
        scrypt.verify(validHash, ['some', 'arbitrary', 'values']).should.eventually.be.rejected
        scrypt.verify(validHash, { some: 'arbitrary values' }).should.eventually.be.rejected
        scrypt.verify(validHash, Symbol('something else')).should.eventually.be.rejected
        scrypt.verify(validHash, () => "no, you can't do this either").should.eventually.be.rejected
    })
    it('throws an error when the hash is not the expected format', async function () {
        const validHash = 'e.WCu8zB9FHLhXaAf5Svn7NE4ySqB5X45X.ZLpxVwLz1816kmshqXHn12X_4_lZD_0Yl-27KSLLzdhXJ0Fr2huSD7BvoMlBMOMUQBKyKXPzhKI01_Ot-C_w8g'
        const hashParts = validHash.split('.')
        async function checkThrows(value, cause) {
            let thrown
            try {
                await scrypt.verify(value, 'bad password')
                thrown = false
            } catch (e) {
                thrown = true
                e.should.be.an.instanceof(scrypt.ParseError)
                expect(e.malformedString).to.eq(value)
                if (cause)
                    expect(e.cause).to.be.an.instanceof(cause)
                else
                    expect(e.cause).to.be.undefined
            }
            thrown.should.be.true
        }
        await checkThrows(undefined, TypeError)
        await checkThrows(1234, TypeError)
        await checkThrows(null, TypeError)
        await checkThrows([1, 2, 3], TypeError)
        scrypt.verify({
            // This is technically valid, why try to prevent it? 🤷
            split: () => hashParts
        }, 'bad password').should.eventually.be.true
        await checkThrows({}, TypeError)

        await checkThrows(validHash.substring(1)) // No cost
        // no salt
        await checkThrows('e..' + hashParts[2])
        // no key
        await checkThrows(hashParts[0] + '.' + hashParts[1])
        await checkThrows('...')
        await checkThrows('')
    })
})

describe('verifySync() error cases', function () {
    it('throws an error when the password is not the right thing', function () {
        const validHash = 'e.WCu8zB9FHLhXaAf5Svn7NE4ySqB5X45X.ZLpxVwLz1816kmshqXHn12X_4_lZD_0Yl-27KSLLzdhXJ0Fr2huSD7BvoMlBMOMUQBKyKXPzhKI01_Ot-C_w8g'
        scrypt.verifySync.bind(undefined, validHash, undefined).should.throw()
        scrypt.verifySync.bind(undefined, validHash, null).should.throw()
        scrypt.verifySync.bind(undefined, validHash, 123.4).should.throw()
        scrypt.verifySync.bind(undefined, validHash, NaN).should.throw()
        scrypt.verifySync.bind(undefined, validHash, ['some', 'arbitrary', 'values']).should.throw()
        scrypt.verifySync.bind(undefined, validHash, { some: 'arbitrary values' }).should.throw()
        scrypt.verifySync.bind(undefined, validHash, Symbol('something else')).should.throw()
        scrypt.verifySync.bind(undefined, validHash, () => "no, you can't do this either").should.throw()
        scrypt.verifySync.bind(undefined, validHash, Promise.resolve("no, you can't do this either")).should.throw()
    })
    it('throws an error when the hash is not the expected format', function () {
        const validHash = 'e.WCu8zB9FHLhXaAf5Svn7NE4ySqB5X45X.ZLpxVwLz1816kmshqXHn12X_4_lZD_0Yl-27KSLLzdhXJ0Fr2huSD7BvoMlBMOMUQBKyKXPzhKI01_Ot-C_w8g'
        const hashParts = validHash.split('.')
        function checkThrows(value, cause) {
            let thrown
            try {
                scrypt.verifySync(value, 'bad password')
                thrown = false
            } catch (e) {
                thrown = true
                e.should.be.an.instanceof(scrypt.ParseError)
                expect(e.malformedString).to.eq(value)
                if (cause)
                    expect(e.cause).to.be.an.instanceof(cause)
                else
                    expect(e.cause).to.be.undefined
            }
            thrown.should.be.true
        }
        checkThrows(undefined, TypeError)
        checkThrows(1234, TypeError)
        checkThrows(null, TypeError)
        checkThrows([1, 2, 3], TypeError)
        scrypt.verify({
            // This is technically valid, why try to prevent it? 🤷
            split: () => hashParts
        }, 'bad password').should.eventually.be.true
        checkThrows({}, TypeError)

        checkThrows(validHash.substring(1)) // No cost
        // no salt
        checkThrows('e..' + hashParts[2])
        // no key
        checkThrows(hashParts[0] + '.' + hashParts[1])
        checkThrows('...')
        checkThrows('')
    })
})