import khoury.EnabledTest
import khoury.fileExists
import khoury.fileReadAsString
import khoury.fileWrite
import khoury.isAnInteger
import khoury.runEnabledTests
import khoury.testSame

val fileBad = "test-bad-run-times.txt"
val fileGood = "test-good-run-times.txt"
val fileGoodValue = 42

// gets the past runs from a supplied file
// (assumes the entire file is just a number)
fun getPastRuns(fname: String): Int {
    val fileText: String = if (fileExists(fname)) fileReadAsString(fname) else ""
    val pastRuns: Int = if (isAnInteger(fileText)) fileText.toInt() else 0

    return pastRuns
}

@EnabledTest
fun testGetPastRuns() {
    testSame(
        getPastRuns("BAD-FILE-DOES-NOT-EXIST"),
        0,
        "file does not exist",
    )

    testSame(
        getPastRuns(fileBad),
        0,
        "bad file contents",
    )

    testSame(
        getPastRuns(fileGood),
        fileGoodValue,
        "good file",
    )
}

// saves the number to the supplied filename
fun saveNewPastRuns(
    filename: String,
    valueToSave: Int,
) {
    fileWrite(filename, "$valueToSave")
}

@EnabledTest
fun testSaveNewPastRuns() {
    // notice: having to "setup" (more later!)
    saveNewPastRuns(fileGood, fileGoodValue)

    // notice: not actually calling the function
    // we are trying to test (more later!)
    testSame(
        getPastRuns(fileGood),
        fileGoodValue,
        "good file",
    )
}

fun main() {
    val pastRunsFilename = "run-times.txt"
    val timesInThePast = getPastRuns(pastRunsFilename)

    println("This program has been run $timesInThePast time(s) in the past.")

    saveNewPastRuns(pastRunsFilename, timesInThePast + 1)
}

runEnabledTests(this)
main()