// +build go1.8

/*
 * Copyright (c) 2020 Baidu, 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 json

import (
	"fmt"
	"math"
	"reflect"
	"strconv"
	"strings"
	"testing"
)

func TestEvaluateTypes(t *testing.T) {
	testCases := []struct {
		In   string
		Data interface{}
		Out  string
		Err  bool
	}{
		// Invalid syntaxes
		{
			In:  `x`,
			Err: true,
		},
		{
			In:  ``,
			Err: true,
		},

		// Null
		{
			In:   `null`,
			Data: nil,
			Out:  `null`,
		},
		// Booleans
		{
			In:   `true`,
			Data: true,
			Out:  `true`,
		},
		{
			In:   `false`,
			Data: false,
			Out:  `false`,
		},

		// Integers
		{
			In:   `0`,
			Data: int64(0),
			Out:  `0`,
		},
		{
			In:   `-0`,
			Data: int64(-0),
			Out:  `0`,
		},
		{
			In:   `1`,
			Data: int64(1),
			Out:  `1`,
		},
		{
			In:   `2147483647`,
			Data: int64(math.MaxInt32),
			Out:  `2147483647`,
		},
		{
			In:   `-2147483648`,
			Data: int64(math.MinInt32),
			Out:  `-2147483648`,
		},
		{
			In:   `9223372036854775807`,
			Data: int64(math.MaxInt64),
			Out:  `9223372036854775807`,
		},
		{
			In:   `-9223372036854775808`,
			Data: int64(math.MinInt64),
			Out:  `-9223372036854775808`,
		},

		// Int overflow
		{
			In:   `9223372036854775808`, // MaxInt64 + 1
			Data: float64(9223372036854775808),
			Out:  `9223372036854776000`,
		},
		{
			In:   `-9223372036854775809`, // MinInt64 - 1
			Data: float64(math.MinInt64),
			Out:  `-9223372036854776000`,
		},

		// Floats
		{
			In:   `0.0`,
			Data: float64(0),
			Out:  `0`,
		},
		{
			In:   `-0.0`,
			Data: float64(-0.0),
			Out:  `-0`,
		},
		{
			In:   `0.5`,
			Data: float64(0.5),
			Out:  `0.5`,
		},
		{
			In:   `1e3`,
			Data: float64(1e3),
			Out:  `1000`,
		},
		{
			In:   `1.5`,
			Data: float64(1.5),
			Out:  `1.5`,
		},
		{
			In:   `-0.3`,
			Data: float64(-.3),
			Out:  `-0.3`,
		},
		{
			// Largest representable float32
			In:   `3.40282346638528859811704183484516925440e+38`,
			Data: float64(math.MaxFloat32),
			Out:  strconv.FormatFloat(math.MaxFloat32, 'g', -1, 64),
		},
		{
			// Smallest float32 without losing precision
			In:   `1.175494351e-38`,
			Data: float64(1.175494351e-38),
			Out:  `1.175494351e-38`,
		},
		{
			// float32 closest to zero
			In:   `1.401298464324817070923729583289916131280e-45`,
			Data: float64(math.SmallestNonzeroFloat32),
			Out:  strconv.FormatFloat(math.SmallestNonzeroFloat32, 'g', -1, 64),
		},
		{
			// Largest representable float64
			In:   `1.797693134862315708145274237317043567981e+308`,
			Data: float64(math.MaxFloat64),
			Out:  strconv.FormatFloat(math.MaxFloat64, 'g', -1, 64),
		},
		{
			// Closest to zero without losing precision
			In:   `2.2250738585072014e-308`,
			Data: float64(2.2250738585072014e-308),
			Out:  `2.2250738585072014e-308`,
		},

		{
			// float64 closest to zero
			In:   `4.940656458412465441765687928682213723651e-324`,
			Data: float64(math.SmallestNonzeroFloat64),
			Out:  strconv.FormatFloat(math.SmallestNonzeroFloat64, 'g', -1, 64),
		},

		{
			// math.MaxFloat64 + 2 overflow
			In:  `1.7976931348623159e+308`,
			Err: true,
		},

		// Strings
		{
			In:   `""`,
			Data: string(""),
			Out:  `""`,
		},
		{
			In:   `"0"`,
			Data: string("0"),
			Out:  `"0"`,
		},
		{
			In:   `"A"`,
			Data: string("A"),
			Out:  `"A"`,
		},
		{
			In:   `"Iñtërnâtiônàlizætiøn"`,
			Data: string("Iñtërnâtiônàlizætiøn"),
			Out:  `"Iñtërnâtiônàlizætiøn"`,
		},

		// Arrays
		{
			In:   `[]`,
			Data: []interface{}{},
			Out:  `[]`,
		},
		{
			In: `[` + strings.Join([]string{
				`null`,
				`true`,
				`false`,
				`0`,
				`9223372036854775807`,
				`0.0`,
				`0.5`,
				`1.0`,
				`1.797693134862315708145274237317043567981e+308`,
				`"0"`,
				`"A"`,
				`"Iñtërnâtiônàlizætiøn"`,
				`[null,true,1,1.0,1.5]`,
				`{"boolkey":true,"floatkey":1.0,"intkey":1,"nullkey":null}`,
			}, ",") + `]`,
			Data: []interface{}{
				nil,
				true,
				false,
				int64(0),
				int64(math.MaxInt64),
				float64(0.0),
				float64(0.5),
				float64(1.0),
				float64(math.MaxFloat64),
				string("0"),
				string("A"),
				string("Iñtërnâtiônàlizætiøn"),
				[]interface{}{nil, true, int64(1), float64(1.0), float64(1.5)},
				map[string]interface{}{"nullkey": nil, "boolkey": true, "intkey": int64(1), "floatkey": float64(1.0)},
			},
			Out: `[` + strings.Join([]string{
				`null`,
				`true`,
				`false`,
				`0`,
				`9223372036854775807`,
				`0`,
				`0.5`,
				`1`,
				strconv.FormatFloat(math.MaxFloat64, 'g', -1, 64),
				`"0"`,
				`"A"`,
				`"Iñtërnâtiônàlizætiøn"`,
				`[null,true,1,1,1.5]`,
				`{"boolkey":true,"floatkey":1,"intkey":1,"nullkey":null}`, // gets alphabetized by Marshal
			}, ",") + `]`,
		},

		// Maps
		{
			In:   `{}`,
			Data: map[string]interface{}{},
			Out:  `{}`,
		},
		{
			In:   `{"boolkey":true,"floatkey":1.0,"intkey":1,"nullkey":null}`,
			Data: map[string]interface{}{"nullkey": nil, "boolkey": true, "intkey": int64(1), "floatkey": float64(1.0)},
			Out:  `{"boolkey":true,"floatkey":1,"intkey":1,"nullkey":null}`, // gets alphabetized by Marshal
		},
	}

	for _, tc := range testCases {
		inputJSON := fmt.Sprintf(`{"data":%s}`, tc.In)
		expectedJSON := fmt.Sprintf(`{"data":%s}`, tc.Out)
		m := map[string]interface{}{}
		err := Unmarshal([]byte(inputJSON), &m)
		if tc.Err && err != nil {
			// Expected error
			continue
		}
		if err != nil {
			t.Errorf("%s: error decoding: %v", tc.In, err)
			continue
		}
		if tc.Err {
			t.Errorf("%s: expected error, got none", tc.In)
			continue
		}
		data, ok := m["data"]
		if !ok {
			t.Errorf("%s: decoded object missing data key: %#v", tc.In, m)
			continue
		}
		if !reflect.DeepEqual(tc.Data, data) {
			t.Errorf("%s: expected\n\t%#v (%v), got\n\t%#v (%v)", tc.In, tc.Data, reflect.TypeOf(tc.Data), data, reflect.TypeOf(data))
			continue
		}

		outputJSON, err := Marshal(m)
		if err != nil {
			t.Errorf("%s: error encoding: %v", tc.In, err)
			continue
		}

		if expectedJSON != string(outputJSON) {
			t.Errorf("%s: expected\n\t%s, got\n\t%s", tc.In, expectedJSON, string(outputJSON))
			continue
		}
	}
}
