package types

import (
	"fmt"
	"reflect"
	"testing"
)

func isNil(x interface{}) bool {
	return x == nil ||
		(reflect.ValueOf(x).Kind() == reflect.Ptr &&
			reflect.ValueOf(x).IsNil())
}

func TestType(t *testing.T) {
	i := 1

	var str string
	var n *Node
	var tp *Type

	chk := func(actual, expected interface{}) {
		t.Run(fmt.Sprintf("TestType%d", i), func(t *testing.T) {
			if isNil(actual) && isNil(expected) {
				return
			}
			if !reflect.DeepEqual(actual, expected) {
				t.Errorf("Test failed for %s\n", str)
				fmt.Println("Actual:\n", actual)
				fmt.Println("Expected:\n", expected)
			}
		})
	}

	chk_newtype := func() {
		tp = NewTypeFromString(str, "")
		chk(tp, &Type{Node: n, Class: ""})
	}

	//tests on nil Type pointers:
	chk(tp.BaseType(), nil)
	chk(tp.CType(), "")
	chk(tp.IsFunction(), false)
	chk(tp.IsPointer(), false)
	chk(tp.IsFunctionPtr(), false)
	chk(tp.IsValist(), false)

	str = "int"
	n = &Node{"TypeName", "", []*Node{
		&Node{"TypeSpecifier", "int", []*Node{}}}}
	chk_newtype()
	tint := tp

	str = "NSObject"
	n = &Node{"TypeName", "", []*Node{
		&Node{"TypedefName", "NSObject", []*Node{}}}}
	chk_newtype()
	nso := tp

	str = "NSString"
	n = &Node{"TypeName", "", []*Node{
		&Node{"TypedefName", "NSString", []*Node{}}}}
	chk_newtype()
	nst := tp

	str = "NSString*"
	n = &Node{"TypeName", "", []*Node{
		&Node{"TypedefName", "NSString", []*Node{}},
		&Node{"Pointer", "*", []*Node{}}}}
	chk_newtype()
	chk(tp.IsPointer(), true)
	chk(tp.Typedef(), nil)
	tpNSString := tp

	str = "myTypedef"
	AddTypedef("myTypedef", tp)
	n = &Node{"TypeName", "", []*Node{
		&Node{"TypedefName", "myTypedef", []*Node{}}}}
	chk_newtype()
	chk(tp.Typedef(), tpNSString)

	str = "const NSArray <ObjectType * _Nonnull> *"
	n = &Node{"TypeName", "", []*Node{
		&Node{"TypeQualifier", "const", []*Node{}},
		&Node{"TypedefName", "NSArray", []*Node{}},
		&Node{"GenericList", "", []*Node{
			&Node{"Generic", "", []*Node{
				&Node{"TypedefName", "ObjectType", []*Node{}},
				&Node{"Pointer", "*", []*Node{}},
				&Node{"NullableAnnotation", "_Nonnull", []*Node{}}}}}},
		&Node{"Pointer", "*", []*Node{}}}}
	chk_newtype()
	chk(tp.CType(), "NSArray*")
	chk(tp.CTypeAttrib(), "const NSArray*")
	chk(tp.CGoType(), "*C.NSArray")
	chk(tp.GoType(), "*NSArray")

	SetTypeParam("MyClass", "ObjectType", "MyClass")
	str = "id<ObjectType *>"
	n = &Node{"TypeName", "", []*Node{
		&Node{"TypedefName", "id", []*Node{}},
		&Node{"GenericList", "", []*Node{
			&Node{"Generic", "", []*Node{
				&Node{"TypedefName", "ObjectType", []*Node{}},
				&Node{"Pointer", "*", []*Node{}}}}}}}}
	chk_newtype()
	tp = NewType(n, "MyClass")
	chk(tp.CType(), "NSObject*")
	chk(tp.String(),
		`<TypeName> ''
-<TypedefName> 'id'
-<GenericList> ''
--<Generic> ''
---<TypedefName> 'MyClass'
---<Pointer> '*'
`)
	x, _ := clean(nil, "MyClass")
	chk(x, nil)
	SetSuper("NSString", "NSObject")
	chk(Super("NSString"), "NSObject")

	tp2 := tp.CloneToClass("NSObject")
	chk(tp2.Class, "NSObject")

	str = "you can't parse this"
	tp = NewTypeFromString(str, "")
	tp2 = &Type{}
	chk(tp, tp2)

	str = "id<ObjectType *>"
	tp2 = NewTypeFromString(str, "MyClass")
	chk(tp.BaseType(), tp)

	str = "id<ObjectType *>*"
	tp = NewTypeFromString(str, "MyClass")
	chk(tp.BaseType(), tp2)
	chk(tp.PointsTo(), tp2)
	AddTypedef("myTypedef", tp)

	str = "myTypedef"
	n = &Node{"TypeName", "", []*Node{
		&Node{"TypedefName", "myTypedef", []*Node{}}}}
	chk_newtype()
	chk(tp.PointsTo(), tp2)
	chk(tp2.PointsTo(), nil)

	chk(tp.GoTypeDecl(), `
type MyTypedef **C.NSObject
`)
	chk(tp2.GoTypeDecl(), "")
	chk(nst.GoTypeDecl(), `
type NSString C.NSString
`)
	str = "void"
	n = &Node{"TypeName", "", []*Node{
		&Node{"TypeSpecifier", "void", []*Node{}}}}
	chk_newtype()
	chk(tp.GoTypeDecl(), "")
	void := tp

	str = "BOOL"
	n, _ = Parse(str)
	chk_newtype()
	bl := tp

	str = "void**"
	n, _ = Parse(str)
	chk_newtype()
	chk(tp.GoType(), "*unsafe.Pointer")
	chk(tp.CToGo("var"), "(*unsafe.Pointer)(unsafe.Pointer(var))")
	voidpp := tp

	Wrap("NSObject")
	str = "NSObject*"
	n, _ = Parse(str)
	chk_newtype()
	chk(tp.GoType(), "NSObject")

	Wrap("NSString")
	chk(nso.GoTypeDecl(), `
type NSObject interface {
	Ptr() unsafe.Pointer
}
`)
	chk(nso.GoType(), "NSObject")

	chk(nst.GoTypeDecl(), `
type NSString struct { Id }
func (o NSString) Ptr() unsafe.Pointer { return o.ptr }
func (o Id) NSString() NSString {
	ret := NSString{}
	ret.ptr = o.ptr
	return ret
}
`)
	str = "int(void)"
	n, _ = Parse(str)
	chk_newtype()
	chk(tp.IsFunction(), true)
	chk(tp.IsFunctionPtr(), false)
	chk(tp.ReturnType().CType(), "int")

	str = "int *(void)"
	n, _ = Parse(str)
	chk_newtype()
	chk(tp.IsFunction(), true)
	chk(tp.ReturnType().CType(), "int*")
	chk(tp.ReturnType().GoType(), "*Int")
	fn := tp

	AddTypedef("myTypedef", fn)
	str = "myTypedef"
	n, _ = Parse(str)
	chk_newtype()
	chk(tp.IsFunction(), true)
	chk(tp.IsFunctionPtr(), false)
	chk(tp.ReturnType().CType(), "int*")

	str = "int (*)(void)"
	n, _ = Parse(str)
	chk_newtype()
	chk(tp.IsFunction(), false)
	chk(tp.IsPointer(), true)
	chk(tp.IsFunctionPtr(), true)
	chk(tp.ReturnType(), nil)
	fnptr := tp

	AddTypedef("myTypedef", fnptr)
	str = "myTypedef"
	n, _ = Parse(str)
	chk_newtype()
	chk(tp.IsFunction(), false)
	chk(tp.IsPointer(), true)
	chk(tp.IsFunctionPtr(), true)
	chk(tp.ReturnType(), nil)

	chk(tp.IsValist(), false)
	str = "__va_list_tag"
	n, _ = Parse(str)
	chk_newtype()
	chk(tp.IsValist(), true)

	str = "GoToC"
	var rtype *Type
	ptypes := []*Type{nst, nso, tint, voidpp}
	pnames := []string{"p1", "p2", "p3", "p4"}
	snames := []string{"", "", "", ""}

	chk_gotoc := func(expected string) {
		chk(GoToC("myFun", pnames, snames, rtype, ptypes, false), expected)
	}

	chk_gotoc("")

	rtype = void
	chk_gotoc(`C.myFun(p1.Ptr(), p2.Ptr(), (C.int)(p3), unsafe.Pointer(p4))`)

	rtype = bl
	chk_gotoc(
		`ret := (C.myFun(p1.Ptr(), p2.Ptr(), (C.int)(p3), unsafe.Pointer(p4))) != 0
	return ret`)

	rtype = voidpp
	chk_gotoc(
		`ret := (*unsafe.Pointer)(unsafe.Pointer(C.myFun(p1.Ptr(), p2.Ptr(), (C.int)(p3), unsafe.Pointer(p4))))
	return ret`)

	rtype = nst
	chk_gotoc(
		`ret := NSString{}
	ret.ptr = C.myFun(p1.Ptr(), p2.Ptr(), (C.int)(p3), unsafe.Pointer(p4))
	return ret`)

	rtype = nso
	chk_gotoc(
		`ret := Id{}
	ret.ptr = C.myFun(p1.Ptr(), p2.Ptr(), (C.int)(p3), unsafe.Pointer(p4))
	return ret`)

	ptypes[1].Variadic = true
	chk_gotoc(
		`ret := Id{}
	ret.ptr = C.myFun(p1.Ptr(), unsafe.Pointer(&p2), (C.int)(p3), unsafe.Pointer(p4))
	return ret`)
	ptypes[1].Variadic = false

	snames[1] = "p2p"
	chk_gotoc(
		`ret := Id{}
	ret.ptr = C.myFun(p1.Ptr(), p2.Ptr(), (C.int)(p3), unsafe.Pointer(p4))
	(*p2) = (*p2)[:cap(*p2)]
	for i := 0; i < len(*p2); i++ {
		if p2p[i] == nil {
			(*p2) = (*p2)[:i]
			break
		}
		(*p2)[i].ptr = p2p[i]
	}
	return ret`)
	snames[1] = ""
	snames[2] = "p3p"
	chk_gotoc(
		`ret := Id{}
	ret.ptr = C.myFun(p1.Ptr(), p2.Ptr(), unsafe.Pointer(&p3p[0]), unsafe.Pointer(p4))
	(*p3) = (*p3)[:cap(*p3)]
	for i := 0; i < len(*p3); i++ {
		if p3p[i] == nil {
			(*p3) = (*p3)[:i]
			break
		}
		(*p3)[i].ptr = p3p[i]
	}
	return ret`)
	chk(GoToC("myFun", pnames, snames, rtype, ptypes, true),
		`ret := Id{}
	ret.ptr = C.myFun(p1.Ptr(), p2.Ptr(), unsafe.Pointer(&p3p[0]), (**C.void)(p4))
	(*p3) = (*p3)[:cap(*p3)]
	for i := 0; i < len(*p3); i++ {
		if p3p[i] == nil {
			(*p3) = (*p3)[:i]
			break
		}
		(*p3)[i].ptr = p3p[i]
	}
	return ret`)
}