// FormatGroceryItemsList Example
// Run this example on the Kotlin Playground Webpage at
// https://play.kotlinlang.org
// Remove or comment out example outputs before running.

//*********************************
// Example A. Load GroceryItem data
// into MutableList collection.
//*********************************

// Grocery items entered from TextField
// and read into these variables.
var desc = "Peanuts"
var code = "24680"
var price = "2.99"

// Create mutable list. In an app, 
// is a state variable.
var groceryList = mutableListOf<String>( )

// Load grocery items into list.
var groceryItem = "($desc;$code;$price)"
groceryList.add(groceryItem)
    
// Add another item.
desc = "Cashews"
code = "32435"
price = "2.99"
groceryItem = "($desc;$code;$price)"
groceryList.add(groceryItem)

// Look at current items in list.
println(groceryList.toString( ))
println( )

// Output:
[(Peanuts;24680;2.99), (Cashews;32435;2.99)]
// Grocery items in this format can be stored
// in a file.
    
//*********************************
// Example B. Format GroceryItem data
// from MutableList to display string, for 
// example in a Text element.
//*********************************

// Sample values of items in mutableList:
//[(Peanuts;24680;2.99), (Cashews;32435;2.99)]
var display = ""
for(item in groceryList) {
    val cleaned = item.removeSurrounding("(", ")")
    val itemArray = cleaned.split(";")
    display += 
        "Description: ${itemArray[0]}\n" +
        "Code: ${itemArray[1]}\n" +
        "Price: ${itemArray[2]}\n\n"
}
println(display)
// Output:
Description: Peanuts
Code: 24680
Price: 2.99

Description: Cashews
Code: 32435
Price: 2.99

//****************************************
// Example C. Load list toString formatted
// formatted data from file back into list.
//****************************************

var formatted = "[(Peanuts;24680;2.99), (Cashews;32435;2.99)]"
groceryList.clear( )
formatted = formatted.removeSurrounding("[", "]")
val groceryArray = formatted.split(",")
for(item in groceryArray) {
    groceryList.add(item.trim( ))
}
println(groceryList)