package reflux

import (
	"testing"
)

// TestSetValueWithNil 测试 setValue 方法处理 nil 值的各种情况
func TestSetValueWithNil(t *testing.T) {
	t.Run("Set nil to pointer field", func(t *testing.T) {
		type Data struct {
			Ptr *string
		}
		data := Data{Ptr: stringPtr("initial")}
		rfx := New(&data)

		rfx.Set("Ptr", nil)
		if data.Ptr != nil {
			t.Errorf("Expected Ptr to be nil, got %v", data.Ptr)
		}
	})

	t.Run("Set nil to interface field", func(t *testing.T) {
		type Data struct {
			Iface interface{}
		}
		data := Data{Iface: "initial"}
		rfx := New(&data)

		rfx.Set("Iface", nil)
		if data.Iface != nil {
			t.Errorf("Expected Iface to be nil, got %v", data.Iface)
		}
	})

	t.Run("Set nil to slice field", func(t *testing.T) {
		type Data struct {
			Slice []string
		}
		data := Data{Slice: []string{"a", "b"}}
		rfx := New(&data)

		rfx.Set("Slice", nil)
		if data.Slice != nil {
			t.Errorf("Expected Slice to be nil, got %v", data.Slice)
		}
	})

	t.Run("Set nil to map field", func(t *testing.T) {
		type Data struct {
			Map map[string]string
		}
		data := Data{Map: map[string]string{"key": "value"}}
		rfx := New(&data)

		rfx.Set("Map", nil)
		if data.Map != nil {
			t.Errorf("Expected Map to be nil, got %v", data.Map)
		}
	})

	t.Run("Set nil to int field - should set to zero value", func(t *testing.T) {
		type Data struct {
			Value int
		}
		data := Data{Value: 42}
		rfx := New(&data)

		rfx.Set("Value", nil)
		if data.Value != 0 {
			t.Errorf("Expected Value to be 0, got %d", data.Value)
		}
	})

	t.Run("Set nil to string field - should set to zero value", func(t *testing.T) {
		type Data struct {
			Value string
		}
		data := Data{Value: "hello"}
		rfx := New(&data)

		rfx.Set("Value", nil)
		if data.Value != "" {
			t.Errorf("Expected Value to be empty string, got %s", data.Value)
		}
	})

	t.Run("Set nil to bool field - should set to zero value", func(t *testing.T) {
		type Data struct {
			Value bool
		}
		data := Data{Value: true}
		rfx := New(&data)

		rfx.Set("Value", nil)
		if data.Value != false {
			t.Errorf("Expected Value to be false, got %v", data.Value)
		}
	})

	t.Run("Set nil to float64 field - should set to zero value", func(t *testing.T) {
		type Data struct {
			Value float64
		}
		data := Data{Value: 3.14}
		rfx := New(&data)

		rfx.Set("Value", nil)
		if data.Value != 0.0 {
			t.Errorf("Expected Value to be 0.0, got %f", data.Value)
		}
	})

	t.Run("Set nil to uint field - should set to zero value", func(t *testing.T) {
		type Data struct {
			Value uint
		}
		data := Data{Value: 100}
		rfx := New(&data)

		rfx.Set("Value", nil)
		if data.Value != 0 {
			t.Errorf("Expected Value to be 0, got %d", data.Value)
		}
	})

	t.Run("Set nil to nested pointer field", func(t *testing.T) {
		type Inner struct {
			Value string
		}
		type Outer struct {
			Inner *Inner
		}
		data := Outer{Inner: &Inner{Value: "test"}}
		rfx := New(&data)

		rfx.Set("Inner", nil)
		if data.Inner != nil {
			t.Errorf("Expected Inner to be nil, got %v", data.Inner)
		}
	})

	t.Run("Set nil in map", func(t *testing.T) {
		m := map[string]interface{}{
			"ptr":   stringPtr("test"),
			"slice": []int{1, 2, 3},
			"map":   map[string]string{"key": "value"},
		}
		rfx := New(&m)

		rfx.Set("ptr", nil)
		rfx.Set("slice", nil)
		rfx.Set("map", nil)

		if m["ptr"] != nil {
			t.Errorf("Expected ptr to be nil, got %v", m["ptr"])
		}
		if m["slice"] != nil {
			t.Errorf("Expected slice to be nil, got %v", m["slice"])
		}
		if m["map"] != nil {
			t.Errorf("Expected map to be nil, got %v", m["map"])
		}
	})

	t.Run("Set nil to various int types", func(t *testing.T) {
		type Data struct {
			Int8   int8
			Int16  int16
			Int32  int32
			Int64  int64
			Uint8  uint8
			Uint16 uint16
			Uint32 uint32
			Uint64 uint64
		}
		data := Data{
			Int8:   127,
			Int16:  32767,
			Int32:  2147483647,
			Int64:  9223372036854775807,
			Uint8:  255,
			Uint16: 65535,
			Uint32: 4294967295,
			Uint64: 18446744073709551615,
		}
		rfx := New(&data)

		rfx.Set("Int8", nil)
		rfx.Set("Int16", nil)
		rfx.Set("Int32", nil)
		rfx.Set("Int64", nil)
		rfx.Set("Uint8", nil)
		rfx.Set("Uint16", nil)
		rfx.Set("Uint32", nil)
		rfx.Set("Uint64", nil)

		if data.Int8 != 0 {
			t.Errorf("Expected Int8 to be 0, got %d", data.Int8)
		}
		if data.Int16 != 0 {
			t.Errorf("Expected Int16 to be 0, got %d", data.Int16)
		}
		if data.Int32 != 0 {
			t.Errorf("Expected Int32 to be 0, got %d", data.Int32)
		}
		if data.Int64 != 0 {
			t.Errorf("Expected Int64 to be 0, got %d", data.Int64)
		}
		if data.Uint8 != 0 {
			t.Errorf("Expected Uint8 to be 0, got %d", data.Uint8)
		}
		if data.Uint16 != 0 {
			t.Errorf("Expected Uint16 to be 0, got %d", data.Uint16)
		}
		if data.Uint32 != 0 {
			t.Errorf("Expected Uint32 to be 0, got %d", data.Uint32)
		}
		if data.Uint64 != 0 {
			t.Errorf("Expected Uint64 to be 0, got %d", data.Uint64)
		}
	})

	t.Run("Set nil to float types", func(t *testing.T) {
		type Data struct {
			Float32 float32
			Float64 float64
		}
		data := Data{
			Float32: 3.14,
			Float64: 2.718,
		}
		rfx := New(&data)

		rfx.Set("Float32", nil)
		rfx.Set("Float64", nil)

		if data.Float32 != 0.0 {
			t.Errorf("Expected Float32 to be 0.0, got %f", data.Float32)
		}
		if data.Float64 != 0.0 {
			t.Errorf("Expected Float64 to be 0.0, got %f", data.Float64)
		}
	})

	t.Run("Set nil to channel field", func(t *testing.T) {
		type Data struct {
			Chan chan int
		}
		ch := make(chan int)
		data := Data{Chan: ch}
		rfx := New(&data)

		rfx.Set("Chan", nil)
		if data.Chan != nil {
			t.Errorf("Expected Chan to be nil, got %v", data.Chan)
		}
	})

	t.Run("Set nil to func field", func(t *testing.T) {
		type Data struct {
			Func func()
		}
		data := Data{Func: func() {}}
		rfx := New(&data)

		rfx.Set("Func", nil)
		if data.Func != nil {
			t.Errorf("Expected Func to be nil")
		}
	})

	t.Run("Set nil to nested struct with various types", func(t *testing.T) {
		type Inner struct {
			Ptr    *string
			Slice  []int
			Map    map[string]string
			Int    int
			String string
			Bool   bool
		}
		type Outer struct {
			Inner Inner
		}
		data := Outer{
			Inner: Inner{
				Ptr:    stringPtr("test"),
				Slice:  []int{1, 2, 3},
				Map:    map[string]string{"key": "value"},
				Int:    42,
				String: "hello",
				Bool:   true,
			},
		}
		rfx := New(&data)

		rfx.Set("Inner.Ptr", nil)
		rfx.Set("Inner.Slice", nil)
		rfx.Set("Inner.Map", nil)
		rfx.Set("Inner.Int", nil)
		rfx.Set("Inner.String", nil)
		rfx.Set("Inner.Bool", nil)

		if data.Inner.Ptr != nil {
			t.Errorf("Expected Inner.Ptr to be nil, got %v", data.Inner.Ptr)
		}
		if data.Inner.Slice != nil {
			t.Errorf("Expected Inner.Slice to be nil, got %v", data.Inner.Slice)
		}
		if data.Inner.Map != nil {
			t.Errorf("Expected Inner.Map to be nil, got %v", data.Inner.Map)
		}
		if data.Inner.Int != 0 {
			t.Errorf("Expected Inner.Int to be 0, got %d", data.Inner.Int)
		}
		if data.Inner.String != "" {
			t.Errorf("Expected Inner.String to be empty, got %s", data.Inner.String)
		}
		if data.Inner.Bool != false {
			t.Errorf("Expected Inner.Bool to be false, got %v", data.Inner.Bool)
		}
	})
}

// Helper function to create string pointer
func stringPtr(s string) *string {
	return &s
}