package mvc2

import "reflect"

func isContext(inTyp reflect.Type) bool {
	return inTyp.String() == "context.Context" // I couldn't find another way; context/context.go is not exported.
}

func indirectVal(v reflect.Value) reflect.Value {
	return reflect.Indirect(v)
}

func indirectTyp(typ reflect.Type) reflect.Type {
	switch typ.Kind() {
	case reflect.Ptr, reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
		return typ.Elem()
	}
	return typ
}

func goodVal(v reflect.Value) bool {
	switch v.Kind() {
	case reflect.Chan, reflect.Func, reflect.Map, reflect.Ptr, reflect.Interface, reflect.Slice:
		if v.IsNil() {
			return false
		}
	}

	return v.IsValid()
}

func isFunc(typ reflect.Type) bool {
	return typ.Kind() == reflect.Func
}

/*
// no f. this, it's too complicated and it will be harder to maintain later on:
func isSliceAndExpectedItem(got reflect.Type, in []reflect.Type, currentBindersIdx int) bool {
	kind := got.Kind()
	// if got result is slice or array.
	return (kind == reflect.Slice || kind == reflect.Array) &&
		// if has expected next input.
		len(in)-1 > currentBindersIdx &&
		// if the current input's type is not the same as got (if it's not a slice of that types or anything else).
		equalTypes(got, in[currentBindersIdx])
}
*/

func equalTypes(got reflect.Type, expected reflect.Type) bool {
	if got == expected {
		return true
	}
	// if accepts an interface, check if the given "got" type does
	// implement this "expected" user handler's input argument.
	if expected.Kind() == reflect.Interface {
		// fmt.Printf("expected interface = %s and got to set on the arg is: %s\n", expected.String(), got.String())
		return got.Implements(expected)
	}
	return false
}