stockManagement.swift

var orderedValues =  100
let cases = 50, outers = 5, pieces = 1
var batches = [["name": "batchJan", "avail": 50, "cased": 0, "outer": 0, "piece": 0], 
               ["name": "batchFeb", "avail": 25, "cased": 0, "outer": 0, "piece": 0],
               ["name": "batchMar", "avail": 125, "cased": 0, "outer": 0, "piece": 0]]              
var totalAvail = 0 
for each in 0..<batches.count {
     totalAvail += (batches[each]["avail"] as! Int)
}
if orderedValues > totalAvail {
        print("Out Of Stock")
}
else {
    for each in 0..<batches.count {
         while(batches[each]["avail"] as! Int > 0) {
            if orderedValues == 0 {
                print(batches)
                break
            }
            else {
                if batches[each]["avail"] as! Int >= cases {
                    if orderedValues >= cases {
                    batches[each]["cased"] = batches[each]["cased"] as! Int + 1
                    orderedValues = orderedValues - cases
                    batches[each]["avail"] = batches[each]["avail"] as! Int -  cases
                    }
                }
                else if batches[each]["avail"] as! Int >= outers { 
                    if orderedValues >= outers {
                    batches[each]["outer"] = batches[each]["outer"] as! Int + 1
                    orderedValues = orderedValues -  outers
                    batches[each]["avail"] = batches[each]["avail"] as! Int - outers
                    }
                }
                else {
                    batches[each]["piece"] = batches[each]["piece"] as! Int +  1
                    orderedValues = orderedValues -  pieces
                    batches[each]["avail"] = batches[each]["avail"] as! Int - pieces
            
                }   
            }
        }
    }    
}