import com.amazon.ion.IonReader
import com.amazon.ion.TextSpan
import com.amazon.ion.system.IonSystemBuilder
import com.amazon.ion.util.Spans
import org.junit.Test


class ScratchPad {

    @Test
    fun lineNumbers() {
        val someIon = """                 // Line 1
                                          // Line 2
            {                             // Line 3
                foo: "I'm on line 4",     // Line 4
                bat: "I'm on line 5",     // Line 5
                boo: "I'm on line 6",     // Line 6
                dee: "I'm on line 7",     // Line 7
                baa: "I'm on line 8"      // Line 8
            }                             // Line 9
        """

        val ion = IonSystemBuilder.standard().build()
        val reader = ion.newReader(someIon)
        report(reader)

        reader.next()
        report(reader)

        reader.stepIn()
        report(reader)

        while(reader.next() != null) {
            report(reader)

        }
    }
    fun report(reader: IonReader) {
        try {
            println("---")
            println("reader.type: ${reader.type}")
            println("value: " + if(reader.type == null) "<not on a value>" else "\"${reader.stringValue()}\"")

            val span = Spans.currentSpan(TextSpan::class.java, reader)

            println("span.startLine: ${span.startLine}")
            println("span.finishLine: ${span.finishLine}")

            val dirtyHack = dirtyHackToGetTheLineNum(reader)
            println("dirtyHackToGetTheLineNum(): $dirtyHack")
            if(dirtyHack != span.startLine) {
                println("span.startLine and dirtyHackToGetTheLineNum() are different!")
            }
        } catch(ex: Exception) {
            println("Can't get current TextSpan: $ex" )
        }
    }

    fun dirtyHackToGetTheLineNum(reader: IonReader): Long {
        val scannerField = reader.javaClass.superclass.superclass.getDeclaredField("_scanner")
        scannerField.isAccessible = true
        val scanner = scannerField.get(reader)
        val lineCountField = scanner.javaClass.getDeclaredField("_line_count")
        lineCountField.isAccessible = true
        val lineNum = lineCountField.get(scanner) as Long
        return lineNum
    }
}