"go/token"
	"io/fs"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"sync"
	"testing"
)

var typeNames = []string{
	"uncommonType",
	"arrayType",
	"chanType",
	"funcType",
	"interfaceType",
	"ptrType",
	"sliceType",
	"structType",
}

type visitor struct {
	m map[string]map[string]bool
}

func newVisitor() visitor {
	v := visitor{}
	v.m = make(map[string]map[string]bool)

//	struct {
//		funcType
//		uncommonType
//		[2]*rtype    // [0] is in, [1] is out
//	}
type funcType = abi.FuncType

// interfaceType represents an interface type.
type interfaceType struct {
	abi.InterfaceType // can embed directly because not a public type.
}

func (t *interfaceType) nameOff(off aNameOff) abi.Name {
	return toRType(&t.Type).nameOff(off)
}

func nameOffFor(t *abi.Type, off aNameOff) abi.Name {

	text := comment.Text()
	if r.doc == "" {
		r.doc = text
		return
	}
	r.doc += "\n" + text
}

func (r *reader) remember(predecl string, typ *ast.InterfaceType) {
	if r.fixmap == nil {
		r.fixmap = make(map[string][]*ast.InterfaceType)
	}
	r.fixmap[predecl] = append(r.fixmap[predecl], typ)
}

func specNames(specs []ast.Spec) []string {
	names := make([]string, 0, len(specs)) // reasonable estimate

		p.fieldDecl(typ)
		return false
	})

	return typ
}

// InterfaceType = "interface" "{" { ( MethodDecl | EmbeddedElem ) ";" } "}" .
func (p *parser) interfaceType() *InterfaceType {
	if trace {
		defer p.trace("interfaceType")()
	}

	typ := new(InterfaceType)
	typ.pos = p.pos()

	p.want(_Interface)
	p.want(_Lbrace)

		return f64hash(p, h)
	case abi.Complex64:
		return c64hash(p, h)
	case abi.Complex128:
		return c128hash(p, h)
	case abi.String:
		return strhash(p, h)
	case abi.Interface:
		i := (*interfacetype)(unsafe.Pointer(t))
		if len(i.Methods) == 0 {
			return nilinterhash(p, h)
		}
		return interhash(p, h)
	case abi.Array:
		a := (*arraytype)(unsafe.Pointer(t))
		for i := uintptr(0); i < a.Len; i++ {

	case *FuncType:
		if n.TypeParams != nil {
			Walk(v, n.TypeParams)
		}
		if n.Params != nil {
			Walk(v, n.Params)
		}
		if n.Results != nil {
			Walk(v, n.Results)
		}

	case *InterfaceType:
		Walk(v, n.Methods)

	case *MapType:
		Walk(v, n.Key)
		Walk(v, n.Value)

	case *ChanType:
		Walk(v, n.Value)

	// Statements
	case *BadStmt:
		// nothing to do

		check.use(e0)

	case *syntax.FuncType:
		typ := new(Signature)
		setDefType(def, typ)
		check.funcType(typ, nil, nil, e)
		return typ

	case *syntax.InterfaceType:
		typ := check.newInterface()
		setDefType(def, typ)
		check.interfaceType(typ, e, def)
		return typ

	case *syntax.MapType:
		typ := new(Map)
		setDefType(def, typ)

		typ.key = check.varType(e.Key)

		return r.signature(nil, nil, nil)
	case pkgbits.TypeSlice:
		return types.NewSlice(r.typ())
	case pkgbits.TypeStruct:
		return r.structType()
	case pkgbits.TypeInterface:
		return r.interfaceType()
	case pkgbits.TypeUnion:
		return r.unionType()
	}
}

func (r *reader) structType() *types.Struct {
	fields := make([]*types.Var, r.Len())
	var tags []string
	for i := range fields {

		return typ

	case *ast.FuncType:
		typ := new(Signature)
		setDefType(def, typ)
		check.funcType(typ, nil, e)
		return typ

	case *ast.InterfaceType:
		typ := check.newInterface()
		setDefType(def, typ)
		check.interfaceType(typ, e, def)
		return typ

	case *ast.MapType:
		typ := new(Map)
		setDefType(def, typ)

		typ.key = check.varType(e.Key)

}

const predeclReserved = 32

type itag uint64

const (
	// Types
	definedType itag = iota
	pointerType
	sliceType
	arrayType
	chanType
	mapType
	signatureType
	structType
	interfaceType
	typeParamType
	instanceType
	unionType
)

// iImportData imports a package from the serialized package data
// and returns the number of bytes consumed and a reference to the package.