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package org.example

import spock.lang.Specification

class LoadBalancerTest extends Specification {

    LoadBalancer loadBalancer = new LoadBalancer()

    def "Should retern list of instances when instances was add to load balancer"() {

        given:
        Instance instance = new Instance("1")

        when:
        loadBalancer.addInstance(instance)

        then:
        List<String> instances = loadBalancer.gatAllInstances()

        instances.size() == 1
    }

    def "Should thor Max instances ehen loadBalancer has mor that 10 instances"() {

        given:
        Instance instance = new Instance("1")
        Instance instance1 = new Instance("2")
        Instance instance2 = new Instance("3")
        Instance instance3 = new Instance("4")
        Instance instance4 = new Instance("5")
        Instance instance5 = new Instance("6")
        Instance instance6 = new Instance("7")
        Instance instance7 = new Instance("8")
        Instance instance8 = new Instance("9")
        Instance instance9 = new Instance("10")
        Instance instance10 = new Instance("11")

        when:
        loadBalancer.addInstance(instance)
        loadBalancer.addInstance(instance1)
        loadBalancer.addInstance(instance2)
        loadBalancer.addInstance(instance3)
        loadBalancer.addInstance(instance4)
        loadBalancer.addInstance(instance5)
        loadBalancer.addInstance(instance6)
        loadBalancer.addInstance(instance7)
        loadBalancer.addInstance(instance8)
        loadBalancer.addInstance(instance9)
        loadBalancer.addInstance(instance10)

        then:
        thrown(RuntimeException)
    }

    def "Should throw duplicated address when try to add instance with duplicated address"() {

        given:
        Instance instance = new Instance("1")
        Instance instance2 = new Instance("1")

        when:
        loadBalancer.addInstance(instance)
        loadBalancer.addInstance(instance2)

        then:
        List<String> instances = loadBalancer.gatAllInstances()

        instances.size() == 1
    }

    def "Should return random instance when call get method"() {

        given:
        Instance instance = new Instance("0")
        loadBalancer.addInstance(instance)

        when:
        Instance receivedInstance = loadBalancer.getRandomInstance()

        then:
        receivedInstance != null

    }
}