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// Copyright 2010 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 utf16_test

import (
        "reflect"
        "testing"
        "unicode"
        . "unicode/utf16"
)

type encodeTest struct {
        in  []rune
        out []uint16
}

var encodeTests = []encodeTest{
        {[]rune{1, 2, 3, 4}, []uint16{1, 2, 3, 4}},
        {[]rune{0xffff, 0x10000, 0x10001, 0x12345, 0x10ffff},
                []uint16{0xffff, 0xd800, 0xdc00, 0xd800, 0xdc01, 0xd808, 0xdf45, 0xdbff, 0xdfff}},
        {[]rune{'a', 'b', 0xd7ff, 0xd800, 0xdfff, 0xe000, 0x110000, -1},
                []uint16{'a', 'b', 0xd7ff, 0xfffd, 0xfffd, 0xe000, 0xfffd, 0xfffd}},
}

func TestEncode(t *testing.T) {
        for _, tt := range encodeTests {
                out := Encode(tt.in)
                if !reflect.DeepEqual(out, tt.out) {
                        t.Errorf("Encode(%x) = %x; want %x", tt.in, out, tt.out)
                }
        }
}

func TestEncodeRune(t *testing.T) {
        for i, tt := range encodeTests {
                j := 0
                for _, r := range tt.in {
                        r1, r2 := EncodeRune(r)
                        if r < 0x10000 || r > unicode.MaxRune {
                                if j >= len(tt.out) {
                                        t.Errorf("#%d: ran out of tt.out", i)
                                        break
                                }
                                if r1 != unicode.ReplacementChar || r2 != unicode.ReplacementChar {
                                        t.Errorf("EncodeRune(%#x) = %#x, %#x; want 0xfffd, 0xfffd", r, r1, r2)
                                }
                                j++
                        } else {
                                if j+1 >= len(tt.out) {
                                        t.Errorf("#%d: ran out of tt.out", i)
                                        break
                                }
                                if r1 != rune(tt.out[j]) || r2 != rune(tt.out[j+1]) {
                                        t.Errorf("EncodeRune(%#x) = %#x, %#x; want %#x, %#x", r, r1, r2, tt.out[j], tt.out[j+1])
                                }
                                j += 2
                                dec := DecodeRune(r1, r2)
                                if dec != r {
                                        t.Errorf("DecodeRune(%#x, %#x) = %#x; want %#x", r1, r2, dec, r)
                                }
                        }
                }
                if j != len(tt.out) {
                        t.Errorf("#%d: EncodeRune didn't generate enough output", i)
                }
        }
}

type decodeTest struct {
        in  []uint16
        out []rune
}

var decodeTests = []decodeTest{
        {[]uint16{1, 2, 3, 4}, []rune{1, 2, 3, 4}},
        {[]uint16{0xffff, 0xd800, 0xdc00, 0xd800, 0xdc01, 0xd808, 0xdf45, 0xdbff, 0xdfff},
                []rune{0xffff, 0x10000, 0x10001, 0x12345, 0x10ffff}},
        {[]uint16{0xd800, 'a'}, []rune{0xfffd, 'a'}},
        {[]uint16{0xdfff}, []rune{0xfffd}},
}

func TestDecode(t *testing.T) {
        for _, tt := range decodeTests {
                out := Decode(tt.in)
                if !reflect.DeepEqual(out, tt.out) {
                        t.Errorf("Decode(%x) = %x; want %x", tt.in, out, tt.out)
                }
        }
}