package reflux

import (
	"encoding/json"
	"testing"
)

// TestJSONMarshal 测试 JSON 序列化
func TestJSONMarshal(t *testing.T) {
	t.Run("Marshal struct", func(t *testing.T) {
		type Person struct {
			Name string
			Age  int
		}
		person := Person{Name: "Alice", Age: 30}
		r := New(&person)

		data, err := json.Marshal(r)
		if err != nil {
			t.Fatalf("Marshal failed: %v", err)
		}

		expected := `{"Name":"Alice","Age":30}`
		if string(data) != expected {
			t.Errorf("Expected %s, got %s", expected, string(data))
		}
	})

	t.Run("Marshal map", func(t *testing.T) {
		m := map[string]any{
			"name": "Bob",
			"age":  25,
		}
		r := New(&m)

		data, err := json.Marshal(r)
		if err != nil {
			t.Fatalf("Marshal failed: %v", err)
		}

		// 反序列化回来验证
		var result map[string]any
		if err := json.Unmarshal(data, &result); err != nil {
			t.Fatalf("Unmarshal verification failed: %v", err)
		}

		if result["name"] != "Bob" || result["age"].(float64) != 25 {
			t.Errorf("Unexpected result: %v", result)
		}
	})

	t.Run("Marshal slice", func(t *testing.T) {
		slice := []int{1, 2, 3, 4, 5}
		r := New(&slice)

		data, err := json.Marshal(r)
		if err != nil {
			t.Fatalf("Marshal failed: %v", err)
		}

		expected := `[1,2,3,4,5]`
		if string(data) != expected {
			t.Errorf("Expected %s, got %s", expected, string(data))
		}
	})

	t.Run("Marshal nested structure", func(t *testing.T) {
		type Address struct {
			City    string
			Country string
		}
		type Person struct {
			Name    string
			Age     int
			Address Address
		}
		person := Person{
			Name: "Charlie",
			Age:  35,
			Address: Address{
				City:    "Beijing",
				Country: "China",
			},
		}
		r := New(&person)

		data, err := json.Marshal(r)
		if err != nil {
			t.Fatalf("Marshal failed: %v", err)
		}

		// 验证可以正确反序列化
		var result Person
		if err := json.Unmarshal(data, &result); err != nil {
			t.Fatalf("Unmarshal verification failed: %v", err)
		}

		if result.Name != "Charlie" || result.Age != 35 ||
			result.Address.City != "Beijing" || result.Address.Country != "China" {
			t.Errorf("Unexpected result: %v", result)
		}
	})
}

// TestJSONUnmarshal 测试 JSON 反序列化
func TestJSONUnmarshal(t *testing.T) {
	t.Run("Unmarshal to struct", func(t *testing.T) {
		type Person struct {
			Name string
			Age  int
		}
		person := Person{}
		r := New(&person)

		jsonData := `{"Name":"David","Age":40}`
		if err := json.Unmarshal([]byte(jsonData), r); err != nil {
			t.Fatalf("Unmarshal failed: %v", err)
		}

		if r.Get("Name").String() != "David" || r.Get("Age").Int() != 40 {
			t.Errorf("Unexpected values after unmarshal: Name=%s, Age=%d",
				r.Get("Name").String(), r.Get("Age").Int())
		}
	})

	t.Run("Unmarshal to map", func(t *testing.T) {
		m := make(map[string]any)
		r := New(&m)

		jsonData := `{"name":"Eve","age":28,"active":true}`
		if err := json.Unmarshal([]byte(jsonData), r); err != nil {
			t.Fatalf("Unmarshal failed: %v", err)
		}

		if r.Get("name").String() != "Eve" {
			t.Errorf("Expected name=Eve, got %s", r.Get("name").String())
		}
		if r.Get("age").Float64() != 28 {
			t.Errorf("Expected age=28, got %v", r.Get("age").Float64())
		}
		if !r.Get("active").Bool() {
			t.Error("Expected active=true")
		}
	})

	t.Run("Unmarshal to slice", func(t *testing.T) {
		slice := []int{}
		r := New(&slice)

		jsonData := `[10,20,30,40,50]`
		if err := json.Unmarshal([]byte(jsonData), r); err != nil {
			t.Fatalf("Unmarshal failed: %v", err)
		}

		arr := r.Array()
		if len(arr) != 5 {
			t.Fatalf("Expected 5 elements, got %d", len(arr))
		}

		for i, expected := range []int{10, 20, 30, 40, 50} {
			if arr[i].Int() != expected {
				t.Errorf("arr[%d]: expected %d, got %d", i, expected, arr[i].Int())
			}
		}
	})
}

// TestJSONRoundTrip 测试序列化和反序列化往返
func TestJSONRoundTrip(t *testing.T) {
	type TestCase struct {
		Name string
		Age  int
		Tags []string
	}

	original := TestCase{
		Name: "Test",
		Age:  99,
		Tags: []string{"tag1", "tag2", "tag3"},
	}

	// 序列化
	r1 := New(&original)
	data, err := json.Marshal(r1)
	if err != nil {
		t.Fatalf("Marshal failed: %v", err)
	}

	// 反序列化
	result := TestCase{}
	r2 := New(&result)
	if err := json.Unmarshal(data, r2); err != nil {
		t.Fatalf("Unmarshal failed: %v", err)
	}

	// 验证
	if r2.Get("Name").String() != "Test" {
		t.Errorf("Name mismatch: got %s", r2.Get("Name").String())
	}
	if r2.Get("Age").Int() != 99 {
		t.Errorf("Age mismatch: got %d", r2.Get("Age").Int())
	}

	tags := r2.Get("Tags").Array()
	if len(tags) != 3 {
		t.Fatalf("Tags length mismatch: got %d", len(tags))
	}
	for i, expected := range []string{"tag1", "tag2", "tag3"} {
		if tags[i].String() != expected {
			t.Errorf("Tags[%d] mismatch: expected %s, got %s", i, expected, tags[i].String())
		}
	}
}