// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// FILE UNDER CONSTRUCTION. ANY AND ALL PARTS MAY CHANGE.
// This file implements the universe and unsafe package scopes.

package types

import "go/ast"

var (
	scope    *ast.Scope // current scope to use for initialization
	Universe *ast.Scope
	Unsafe   *ast.Object // package unsafe
)

func define(kind ast.ObjKind, name string) *ast.Object {
	obj := ast.NewObj(kind, name)
	if scope.Insert(obj) != nil {
		panic("types internal error: double declaration")
	}
	obj.Decl = scope
	return obj
}

func defType(name string) *Name {
	obj := define(ast.Typ, name)
	typ := &Name{Underlying: &Basic{}, Obj: obj}
	obj.Type = typ
	return typ
}

func defConst(name string) {
	obj := define(ast.Con, name)
	_ = obj // TODO(gri) fill in other properties
}

func defFun(name string) {
	obj := define(ast.Fun, name)
	_ = obj // TODO(gri) fill in other properties
}

var (
	Bool,
	Int,
	Float64,
	Complex128,
	String *Name
)

func init() {
	scope = ast.NewScope(nil)
	Universe = scope

	Bool = defType("bool")
	defType("byte") // TODO(gri) should be an alias for uint8
	defType("rune") // TODO(gri) should be an alias for int
	defType("complex64")
	Complex128 = defType("complex128")
	defType("error")
	defType("float32")
	Float64 = defType("float64")
	defType("int8")
	defType("int16")
	defType("int32")
	defType("int64")
	String = defType("string")
	defType("uint8")
	defType("uint16")
	defType("uint32")
	defType("uint64")
	Int = defType("int")
	defType("uint")
	defType("uintptr")

	defConst("true")
	defConst("false")
	defConst("iota")
	defConst("nil")

	defFun("append")
	defFun("cap")
	defFun("close")
	defFun("complex")
	defFun("copy")
	defFun("delete")
	defFun("imag")
	defFun("len")
	defFun("make")
	defFun("new")
	defFun("panic")
	defFun("print")
	defFun("println")
	defFun("real")
	defFun("recover")

	scope = ast.NewScope(nil)
	Unsafe = ast.NewObj(ast.Pkg, "unsafe")
	Unsafe.Data = scope

	defType("Pointer")

	defFun("Alignof")
	defFun("Offsetof")
	defFun("Sizeof")
}