/**
* Object copying in Kotlin (also mostly applies to Java)
* @author gtowell
* Created: August 2021
* modified: Nov 12, 2021
 */

// a simple data class with two vals and a var
data class ttt(val aa:Int, val bb:Int, var cc:Int)

// a simple class with two vals and a var
class tt(val aa:Int, val bb:Int, var cc:Int) {
    // a copy constructor
    constructor(told:tt) : this(told.aa, told.bb, told.cc)

    // a copy function thtat is totally equivalent to the copy constructor
    fun gtcopy() = tt(this.aa, this.bb, this.cc)
    override fun equals(other:Any?) =
        (other is tt) &&
        (other.aa == this.aa) &&
        (other.bb == this.bb) &&
        (other.cc == this.cc)
    override fun toString() = "tt(%d %d %d)".format(aa,bb,cc)
}


// Testing the copy function that exists by default for data classes
fun tttest() {
    val aa = ttt(1,2,3)
    val bb = ttt(1,2,3)
    val cc = aa.copy()
    println("aa bb ==${aa==bb} ===${aa===bb}")
    println("aa cc ==${aa==cc} ===${aa===cc}")
}

// testign the two copy functions written for non data class
fun ttest() {
    val aa = tt(1,2,3)
    val bb = tt(1,2,3)
    //val cc = aa.copy()   //only defined for data class
    val cc = tt(aa)
    val dd = aa.gtcopy()
    println("aa aa ==${aa==aa} ===${aa===aa}")
    println("aa bb ==${aa==bb} ===${aa===bb}")
    println("aa cc ==${aa==cc} ===${aa===cc}")
    println("aa dd ==${aa==dd} ===${aa===dd}")
}

// Now for lists
fun cop() {
    // first create a mutable list and then a slice of that list
    val lst = mutableListOf<Int>(1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9)
    val sli = lst.slice(5..12)
    println(lst)
    println(sli)
    // change an item in the list.
    // the item in the slice is unchanged
    lst[8]=88
    println(lst)
    println(sli)

    // create a list of mutable objects, slice as before
    // this time change the internals of the object
    val lst2 = listOf<tt>(tt(1,2,3), tt(2,3,4), tt(3,4,5), tt(4,5,6))
    val sli2 = lst2.slice(1..2)
    println(lst2)
    println(sli2)
    lst2.get(2).cc=88
    println(lst2)
    println(sli2)
    
}

fun main() {
    tttest()
    ttest()
    cop()
}