// Copyright 2013 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.

// This file implements tests for various issues.

package types

import (
	"go/ast"
	"go/parser"
	"strings"
	"testing"
)

func TestIssue5770(t *testing.T) {
	src := `package p; type S struct{T}`
	f, err := parser.ParseFile(fset, "", src, 0)
	if err != nil {
		t.Error(err)
		return
	}

	_, err = Check(f.Name.Name, fset, []*ast.File{f}) // do not crash
	want := "undeclared name: T"
	if err == nil || !strings.Contains(err.Error(), want) {
		t.Errorf("got: %v; want: %s", err, want)
	}
}

func TestIssue5849(t *testing.T) {
	src := `
package p
var (
	s uint
	_ = uint8(8)
	_ = uint16(16) << s
	_ = uint32(32 << s)
	_ = uint64(64 << s + s)
	_ = (interface{})("foo")
	_ = (interface{})(nil)
)`
	f, err := parser.ParseFile(fset, "", src, 0)
	if err != nil {
		t.Error(err)
		return
	}

	var conf Config
	types := make(map[ast.Expr]Type)
	_, err = conf.Check(f.Name.Name, fset, []*ast.File{f}, &Info{Types: types})
	if err != nil {
		t.Error(err)
	}

	for x, typ := range types {
		var want Type
		switch x := x.(type) {
		case *ast.BasicLit:
			switch x.Value {
			case `8`:
				want = Typ[Uint8]
			case `16`:
				want = Typ[Uint16]
			case `32`:
				want = Typ[Uint32]
			case `64`:
				want = Typ[Uint] // because of "+ s", s is of type uint
			case `"foo"`:
				want = Typ[String]
			}
		case *ast.Ident:
			if x.Name == "nil" {
				want = Typ[UntypedNil]
			}
		}
		if want != nil && !IsIdentical(typ, want) {
			t.Errorf("got %s; want %s", typ, want)
		}
	}
}

func TestIssue5815(t *testing.T) {
	pkg, err := GcImport(make(map[string]*Package), "strings")
	if err != nil {
		t.Fatal(err)
	}

	for _, obj := range pkg.scope.elems {
		if obj.Pkg() == nil {
			t.Errorf("no pkg for %s", obj)
		}
		if tname, _ := obj.(*TypeName); tname != nil {
			if named, _ := tname.typ.(*Named); named != nil {
				for _, m := range named.methods {
					if m.pkg == nil {
						t.Errorf("no pkg for %s", m)
					}
				}
			}
		}
	}
}