NetworkWithLevels.kt

gistfile1.txt

/* 
* Product Requirement: The function SlowNetwork::getCountries returns a list of countries. Display the name of the first country on screen.
* Tapping on the country will display a toast saying "The capital for <country name> is <country capital>"
*
* Things to note:
* + Start by creating a new project on Android Studio. Copy the entire contents of this file to your project.
* + You are not allowed to edit the contents of this file.
* + You are free to choose your path for implementing this solution.
* + You are allowed to look through any documentation and/or use a search engine for reference on syntax.
* + Please think out loud to keep the interviewers engaged in your solution.
*/
import android.os.Looper
import java.lang.Exception

enum class LEVEL {
    ONE, TWO, THREE
}

val currentLevel = LEVEL.TWO


val COUNTRIES = """
[
        {
            "country_name": "Afghanistan",
            "country_code": "AFG"
        },
        {
            "country_name": "Denmark",
            "country_code": "DEN"
        },
        {
            "country_name": "Ireland",
            "country_code": "IRL"
        },
        {
            "country_name": "Russian Federation",
            "country_code": "RUSS"
        },
        {
            "country_name": "Taiwan",
            "country_code": "TAI"
        }
]
""".trimIndent()

val CAPITALS = listOf(
    """{ "country_name": "Afghanistan", "capital": "Kabul" }""",
    """{ "country_name": "Denmark", "capital": "Copenhagen" }""",
    """{ "country_name": "Ireland", "capital": "Dublin" }""",
    """{ "country_name": "Russian Federation", "capital": "Moscow" }""",
    """{ "country_name": "Taiwan Federation", "capital": "Taipei" }"""
)

class NetworkWithLevels {
    fun getCountries(): String {
        if (currentLevel == LEVEL.ONE) {
            return "Afghanistan"
        } else if (currentLevel == LEVEL.TWO) {
            return COUNTRIES
        } else if (currentLevel == LEVEL.THREE) {
            Thread.sleep(5000)
            return COUNTRIES
        } else
            if (Thread.currentThread().equals(Looper.getMainLooper().thread)) {
                throw Exception("Cannot call from main thread")
            }
        Thread.sleep(5000)
        return COUNTRIES
    }

    fun getCountryCodeFor(countryName: String): String {
        if (currentLevel != LEVEL.ONE) {
            throw Exception("This function is only for Level one")
        }
        return "AFG"
    }

    fun getCapitolFor(countryCode: String): String {
        if (currentLevel == LEVEL.ONE) {
            if (countryCode.equals("AFG")) {
                return "Kabul"
            } else {
                return "Country code not found"
            }
        } else {
            val array = ArrayList<String>()
            if (Thread.currentThread().equals(Looper.getMainLooper().thread)) {
                throw Exception("Cannot call from main thread")
            }

            Thread.sleep(4000)
            return when (countryCode) {
                "AFG" -> {
                    CAPITALS.get(0)
                }
                "DEN" -> {
                    CAPITALS.get(1)
                }
                "IRL" -> {
                    CAPITALS.get(2)
                }
                "RUSS" -> {
                    CAPITALS.get(3)
                }
                "TAI" -> {
                    CAPITALS.get(4)
                }
                else -> {
                    "Unknown code"
                }
            }
        }
    }
}