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// 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.

package reflect_test

import (
        "bytes"
        "go/ast"
        "io"
        . "reflect"
        "testing"
        "unsafe"
)

type MyBuffer bytes.Buffer

func TestImplicitMapConversion(t *testing.T) {
        // Test implicit conversions in MapIndex and SetMapIndex.
        {
                // direct
                m := make(map[int]int)
                mv := ValueOf(m)
                mv.SetMapIndex(ValueOf(1), ValueOf(2))
                x, ok := m[1]
                if x != 2 {
                        t.Errorf("#1 after SetMapIndex(1,2): %d, %t (map=%v)", x, ok, m)
                }
                if n := mv.MapIndex(ValueOf(1)).Interface().(int); n != 2 {
                        t.Errorf("#1 MapIndex(1) = %d", n)
                }
        }
        {
                // convert interface key
                m := make(map[interface{}]int)
                mv := ValueOf(m)
                mv.SetMapIndex(ValueOf(1), ValueOf(2))
                x, ok := m[1]
                if x != 2 {
                        t.Errorf("#2 after SetMapIndex(1,2): %d, %t (map=%v)", x, ok, m)
                }
                if n := mv.MapIndex(ValueOf(1)).Interface().(int); n != 2 {
                        t.Errorf("#2 MapIndex(1) = %d", n)
                }
        }
        {
                // convert interface value
                m := make(map[int]interface{})
                mv := ValueOf(m)
                mv.SetMapIndex(ValueOf(1), ValueOf(2))
                x, ok := m[1]
                if x != 2 {
                        t.Errorf("#3 after SetMapIndex(1,2): %d, %t (map=%v)", x, ok, m)
                }
                if n := mv.MapIndex(ValueOf(1)).Interface().(int); n != 2 {
                        t.Errorf("#3 MapIndex(1) = %d", n)
                }
        }
        {
                // convert both interface key and interface value
                m := make(map[interface{}]interface{})
                mv := ValueOf(m)
                mv.SetMapIndex(ValueOf(1), ValueOf(2))
                x, ok := m[1]
                if x != 2 {
                        t.Errorf("#4 after SetMapIndex(1,2): %d, %t (map=%v)", x, ok, m)
                }
                if n := mv.MapIndex(ValueOf(1)).Interface().(int); n != 2 {
                        t.Errorf("#4 MapIndex(1) = %d", n)
                }
        }
        {
                // convert both, with non-empty interfaces
                m := make(map[io.Reader]io.Writer)
                mv := ValueOf(m)
                b1 := new(bytes.Buffer)
                b2 := new(bytes.Buffer)
                mv.SetMapIndex(ValueOf(b1), ValueOf(b2))
                x, ok := m[b1]
                if x != b2 {
                        t.Errorf("#5 after SetMapIndex(b1, b2): %p (!= %p), %t (map=%v)", x, b2, ok, m)
                }
                if p := mv.MapIndex(ValueOf(b1)).Elem().Pointer(); p != uintptr(unsafe.Pointer(b2)) {
                        t.Errorf("#5 MapIndex(b1) = %p want %p", p, b2)
                }
        }
        {
                // convert channel direction    
                m := make(map[<-chan int]chan int)
                mv := ValueOf(m)
                c1 := make(chan int)
                c2 := make(chan int)
                mv.SetMapIndex(ValueOf(c1), ValueOf(c2))
                x, ok := m[c1]
                if x != c2 {
                        t.Errorf("#6 after SetMapIndex(c1, c2): %p (!= %p), %t (map=%v)", x, c2, ok, m)
                }
                if p := mv.MapIndex(ValueOf(c1)).Pointer(); p != ValueOf(c2).Pointer() {
                        t.Errorf("#6 MapIndex(c1) = %p want %p", p, c2)
                }
        }
        {
                // convert identical underlying types
                // TODO(rsc): Should be able to define MyBuffer here.
                // 6l prints very strange messages about .this.Bytes etc
                // when we do that though, so MyBuffer is defined
                // at top level.
                m := make(map[*MyBuffer]*bytes.Buffer)
                mv := ValueOf(m)
                b1 := new(MyBuffer)
                b2 := new(bytes.Buffer)
                mv.SetMapIndex(ValueOf(b1), ValueOf(b2))
                x, ok := m[b1]
                if x != b2 {
                        t.Errorf("#7 after SetMapIndex(b1, b2): %p (!= %p), %t (map=%v)", x, b2, ok, m)
                }
                if p := mv.MapIndex(ValueOf(b1)).Pointer(); p != uintptr(unsafe.Pointer(b2)) {
                        t.Errorf("#7 MapIndex(b1) = %p want %p", p, b2)
                }
        }

}

func TestImplicitSetConversion(t *testing.T) {
        // Assume TestImplicitMapConversion covered the basics.
        // Just make sure conversions are being applied at all.
        var r io.Reader
        b := new(bytes.Buffer)
        rv := ValueOf(&r).Elem()
        rv.Set(ValueOf(b))
        if r != b {
                t.Errorf("after Set: r=%T(%v)", r, r)
        }
}

func TestImplicitSendConversion(t *testing.T) {
        c := make(chan io.Reader, 10)
        b := new(bytes.Buffer)
        ValueOf(c).Send(ValueOf(b))
        if bb := <-c; bb != b {
                t.Errorf("Received %p != %p", bb, b)
        }
}

func TestImplicitCallConversion(t *testing.T) {
        // Arguments must be assignable to parameter types.
        fv := ValueOf(io.WriteString)
        b := new(bytes.Buffer)
        fv.Call([]Value{ValueOf(b), ValueOf("hello world")})
        if b.String() != "hello world" {
                t.Errorf("After call: string=%q want %q", b.String(), "hello world")
        }
}

func TestImplicitAppendConversion(t *testing.T) {
        // Arguments must be assignable to the slice's element type.
        s := []io.Reader{}
        sv := ValueOf(&s).Elem()
        b := new(bytes.Buffer)
        sv.Set(Append(sv, ValueOf(b)))
        if len(s) != 1 || s[0] != b {
                t.Errorf("after append: s=%v want [%p]", s, b)
        }
}

var implementsTests = []struct {
        x interface{}
        t interface{}
        b bool
}{
        {new(*bytes.Buffer), new(io.Reader), true},
        {new(bytes.Buffer), new(io.Reader), false},
        {new(*bytes.Buffer), new(io.ReaderAt), false},
        {new(*ast.Ident), new(ast.Expr), true},
}

func TestImplements(t *testing.T) {
        for _, tt := range implementsTests {
                xv := TypeOf(tt.x).Elem()
                xt := TypeOf(tt.t).Elem()
                if b := xv.Implements(xt); b != tt.b {
                        t.Errorf("(%s).Implements(%s) = %v, want %v", xv.String(), xt.String(), b, tt.b)
                }
        }
}

var assignableTests = []struct {
        x interface{}
        t interface{}
        b bool
}{
        {new(chan int), new(<-chan int), true},
        {new(<-chan int), new(chan int), false},
        {new(*int), new(IntPtr), true},
        {new(IntPtr), new(*int), true},
        {new(IntPtr), new(IntPtr1), false},
        // test runs implementsTests too
}

type IntPtr *int
type IntPtr1 *int

func TestAssignableTo(t *testing.T) {
        for _, tt := range append(assignableTests, implementsTests...) {
                xv := TypeOf(tt.x).Elem()
                xt := TypeOf(tt.t).Elem()
                if b := xv.AssignableTo(xt); b != tt.b {
                        t.Errorf("(%s).AssignableTo(%s) = %v, want %v", xv.String(), xt.String(), b, tt.b)
                }
        }
}