/*
 * Copyright 2022 ByteDance Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package sonic

import (
	"bytes"
	"compress/gzip"
	"encoding/json"
	"io"
	"os"
	"reflect"
	"testing"

	"github.com/bytedance/sonic/internal/envs"
	"github.com/bytedance/sonic/option"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestCompatUnmarshalStd(t *testing.T) {
	var sobj = map[string]interface{}{}
	var jobj = map[string]interface{}{}
	var data = []byte(`{"a":1.00000001E-10}`)
	var str = string(data)
	serr := ConfigStd.UnmarshalFromString(str, &sobj)
	jerr := json.Unmarshal(data, &jobj)
	require.Equal(t, jerr, serr)
	require.Equal(t, jobj, sobj)
	data[2] = '0'
	require.Equal(t, jobj, sobj)

	sobj = map[string]interface{}{}
	jobj = map[string]interface{}{}
	data = []byte(`{"a":1}`)
	cfg := Config{
		UseNumber: true,
	}.Froze()
	serr = cfg.Unmarshal(data, &sobj)
	dec := json.NewDecoder(bytes.NewBuffer(data))
	dec.UseNumber()
	jerr = dec.Decode(&jobj)
	require.Equal(t, jerr, serr)
	require.Equal(t, jobj, sobj)

	x := struct {
		A json.Number
		B json.Number
	}{}
	y := struct {
		A json.Number
		B json.Number
	}{}
	data = []byte(`{"A":"1", "C":-1, "B":1}`)
	cfg = Config{
		DisallowUnknownFields: true,
	}.Froze()
	serr = cfg.Unmarshal(data, &x)
	dec = json.NewDecoder(bytes.NewBuffer(data))
	dec.UseNumber()
	dec.DisallowUnknownFields()
	jerr = dec.Decode(&y)
	require.Equal(t, jerr, serr)
	// require.Equal(t, y, x)
}

func TestCompatMarshalStd(t *testing.T) {
	t.Parallel()
	var obj = map[string]interface{}{
		"c": json.RawMessage(" [ \"<&>\" ] "),
		"b": json.RawMessage(" [ ] "),
	}
	sout, serr := ConfigStd.Marshal(obj)
	jout, jerr := json.Marshal(obj)
	require.Equal(t, jerr, serr)
	require.Equal(t, string(jout), string(sout))

	obj = map[string]interface{}{
		"a": json.RawMessage(" [} "),
	}
	sout, serr = ConfigStd.Marshal(obj)
	jout, jerr = json.Marshal(obj)
	require.NotNil(t, jerr)
	require.NotNil(t, serr)
	require.Equal(t, string(jout), string(sout))

	obj = map[string]interface{}{
		"a": json.RawMessage("1"),
	}
	sout, serr = ConfigStd.MarshalIndent(obj, "xxxx", "  ")
	jout, jerr = json.MarshalIndent(obj, "xxxx", "  ")
	require.Equal(t, jerr, serr)
	require.Equal(t, string(jout), string(sout))
}

func TestCompatEncoderStd(t *testing.T) {
	var o = map[string]interface{}{
		"a": "<>",
		"b": json.RawMessage(" [ ] "),
	}
	var w1 = bytes.NewBuffer(nil)
	var w2 = bytes.NewBuffer(nil)
	var enc1 = json.NewEncoder(w1)
	var enc2 = ConfigStd.NewEncoder(w2)

	require.Nil(t, enc1.Encode(o))
	require.Nil(t, enc2.Encode(o))
	require.Equal(t, w1.String(), w2.String())

	enc1.SetEscapeHTML(true)
	enc2.SetEscapeHTML(true)
	enc1.SetIndent("\n", "  ")
	enc2.SetIndent("\n", "  ")
	require.Nil(t, enc1.Encode(o))
	require.Nil(t, enc2.Encode(o))
	require.Equal(t, w1.String(), w2.String())

	enc1.SetEscapeHTML(false)
	enc2.SetEscapeHTML(false)
	enc1.SetIndent("", "")
	enc2.SetIndent("", "")
	require.Nil(t, enc1.Encode(o))
	require.Nil(t, enc2.Encode(o))
	require.Equal(t, w1.String(), w2.String())
}

func TestCompatDecoderStd(t *testing.T) {
	var o1 = map[string]interface{}{}
	var o2 = map[string]interface{}{}
	var s = `{"a":"b"} {"1":"2"} a {}`
	var w1 = bytes.NewBuffer([]byte(s))
	var w2 = bytes.NewBuffer([]byte(s))
	var enc1 = json.NewDecoder(w1)
	var enc2 = ConfigStd.NewDecoder(w2)

	require.Equal(t, enc1.More(), enc2.More())
	require.Nil(t, enc1.Decode(&o1))
	require.Nil(t, enc2.Decode(&o2))
	require.Equal(t, w1.String(), w2.String())

	require.Equal(t, enc1.More(), enc2.More())
	require.Nil(t, enc1.Decode(&o1))
	require.Nil(t, enc2.Decode(&o2))
	require.Equal(t, w1.String(), w2.String())

	require.Equal(t, enc1.More(), enc2.More())
	require.NotNil(t, enc1.Decode(&o1))
	require.NotNil(t, enc2.Decode(&o2))
	require.Equal(t, w1.String(), w2.String())
}

func TestPretouch(t *testing.T) {
	var v map[string]interface{}
	if err := Pretouch(reflect.TypeOf(v)); err != nil {
		t.Errorf("err:%v", err)
	}

	if err := Pretouch(reflect.TypeOf(v),
		option.WithCompileRecursiveDepth(1),
		option.WithCompileMaxInlineDepth(2),
	); err != nil {
		t.Errorf("err:%v", err)
	}
}

func TestGet(t *testing.T) {
	var data = `{"a":"b"}`
	r, err := GetFromString(data, "a")
	if err != nil {
		t.Fatal(err)
	}
	v, err := r.String()
	if err != nil {
		t.Fatal(err)
	}
	if v != "b" {
		t.Fatal(v)
	}
}

func TestUnmarshalWithTrailingChars(t *testing.T) {
	for i, str := range []string{
		"123",
		"123 ",
		"{} [] ",
		"{} [ ",
		"[],",
		"[]null",
		"false null",
	} {
		var msg1, msg2 json.RawMessage
		err1 := json.Unmarshal([]byte(str), &msg1)
		err2 := ConfigStd.UnmarshalFromString(str, &msg2)
		require.Equal(t, err1 == nil, err2 == nil, i)
		// sonic will not clear the unmarshaled value here, but encoding/json will
		// require.Equal(t, msg1, msg2)
	}
}

func TestUnmarshalJSONSuite(t *testing.T) {
	if envs.UseOptDec {
		t.Skip("this test still fails in OPTDEC") // FIXME: fix the optdec issues
	}

	gzFile, err := os.Open("testdata/JSONTestSuite/testdata.json.gz")
	require.NoError(t, err)
	defer gzFile.Close()

	gzReader, err := gzip.NewReader(gzFile)
	require.NoError(t, err)
	defer gzReader.Close()

	data, err := io.ReadAll(gzReader)
	require.NoError(t, err)

	var tests map[string]string
	err = json.Unmarshal(data, &tests)
	require.NoError(t, err)

	for name, tt := range tests {
		b := []byte(tt)
		t.Run(name, func(t *testing.T) {
			serr := ConfigStd.Unmarshal(b, new(json.RawMessage))
			jerr := json.Unmarshal(b, new(json.RawMessage))
			assert.Equal(t, jerr != nil, serr != nil, "json: %v, sonic: %v", jerr, serr)

			serr = ConfigStd.Unmarshal(b, new(interface{}))
			jerr = json.Unmarshal(b, new(interface{}))
			assert.Equal(t, jerr != nil, serr != nil, "json: %v, sonic: %v", jerr, serr)
		})
	}
}