package builtins

import (
	"monkey/object"
	"sort"
)

// Max ...
func Max(args ...object.Object) object.Object {
	if len(args) != 1 {
		return newError("wrong number of arguments. got=%d, want=1",
			len(args))
	}

	if a, ok := args[0].(*object.Array); ok {
		// TODO: Make this more generic
		xs := make([]int, len(a.Elements))
		for n, e := range a.Elements {
			if i, ok := e.(*object.Integer); ok {
				xs = append(xs, int(i.Value))
			} else {
				return newError("item #%d  not an `int` got=%s", n, e.Type())
			}
		}
		sort.Ints(xs)
		return &object.Integer{Value: int64(xs[len(xs)-1])}
	}
	return newError("argument #1 to `max` expected to be `array` got=%T", args[0].Type())
}