// Package miot provides white-box tests for miot_client.go core client.
// Complements existing tests in miot_test.go with additional coverage.
package miot

import (
	"testing"
)

// ============================================================================
// NewMIoTClient — field initialization
// ============================================================================

func TestNewMIoTClient_FieldsInitialized(t *testing.T) {
	c := NewMIoTClient("entry1", map[string]interface{}{"key": "val"}, "uid1", "cn", CtrlModeCloud)

	if c.entryID != "entry1" {
		t.Errorf("entryID = %q, want 'entry1'", c.entryID)
	}
	if c.uid != "uid1" {
		t.Errorf("uid = %q, want 'uid1'", c.uid)
	}
	if c.cloudServer != "cn" {
		t.Errorf("cloudServer = %q, want 'cn'", c.cloudServer)
	}
	if c.ctx == nil {
		t.Error("ctx should not be nil")
	}
	if c.cancel == nil {
		t.Error("cancel should not be nil")
	}
	if c.subTree == nil {
		t.Error("subTree should not be nil")
	}
	if c.deviceListCache == nil {
		t.Error("deviceListCache should not be nil")
	}
	if c.refreshPropsList == nil {
		t.Error("refreshPropsList should not be nil")
	}
	if c.mipsLocal == nil {
		t.Error("mipsLocal should not be nil")
	}

	c.Stop()
}

func TestNewMIoTClient_NoEntryData(t *testing.T) {
	c := NewMIoTClient("entry2", nil, "uid2", "us", CtrlModeLAN)

	if c.ctrlMode != CtrlModeLAN {
		t.Errorf("ctrlMode = %v, want LAN", c.ctrlMode)
	}
	c.Stop()
}

// ============================================================================
// SetStorage / SetHTTPClient / SetMipsCloud / SetMipsLocal
// ============================================================================

func TestSetStorage(t *testing.T) {
	c := NewMIoTClient("test", nil, "uid", "cn", CtrlModeCloud)
	defer c.Stop()

	s := NewMIoTStorage(t.TempDir())
	c.SetStorage(s)

	if c.storage != s {
		t.Error("SetStorage did not set storage")
	}
}

func TestSetHTTPClient(t *testing.T) {
	c := NewMIoTClient("test", nil, "uid", "cn", CtrlModeCloud)
	defer c.Stop()

	http := &MIoTHttpClient{}
	c.SetHTTPClient(http)

	if c.http != http {
		t.Error("SetHTTPClient did not set http")
	}
}

func TestSetMipsCloud(t *testing.T) {
	c := NewMIoTClient("test", nil, "uid", "cn", CtrlModeCloud)

	mc := NewMipsCloudClient("ssl://host:8883", "client1", "user", "pass")
	c.SetMipsCloud(mc)

	if c.mipsCloud != mc {
		t.Error("SetMipsCloud did not set mipsCloud")
	}

	// Clean up: nil out mipsCloud before Stop/Deinit to avoid Disconnect panic
	c.mipsCloud = nil
	c.Stop()
}

func TestSetMipsLocal(t *testing.T) {
	c := NewMIoTClient("test", nil, "uid", "cn", CtrlModeCloud)

	ml := NewMipsLocalClient("did_local", "host", 8883, "", "", "")
	c.SetMipsLocal("group1", ml)

	if got := c.mipsLocal["group1"]; got != ml {
		t.Errorf("SetMipsLocal = %v, want %v", got, ml)
	}

	// Clean up before Stop
	c.mipsLocal = make(map[string]*MipsLocalClient)
	c.Stop()
}

// ============================================================================
// Init — no entryData (no HTTP client created)
// ============================================================================

func TestInit_NoCredentials(t *testing.T) {
	c := NewMIoTClient("test", nil, "uid", "cn", CtrlModeCloud)
	defer c.Stop()

	s := NewMIoTStorage(t.TempDir())
	c.SetStorage(s)

	err := c.Init()
	if err != nil {
		t.Fatalf("Init should not error: %v", err)
	}

	// Without entryData credentials, http should remain nil
	if c.http != nil {
		t.Error("http should be nil without credentials in entryData")
	}
}

func TestInit_WithCredentials(t *testing.T) {
	c := NewMIoTClient("test", map[string]interface{}{
		"client_id":    "test_client_id",
		"access_token": "test_token",
	}, "uid", "cn", CtrlModeCloud)
	defer c.Stop()

	s := NewMIoTStorage(t.TempDir())
	c.SetStorage(s)

	err := c.Init()
	if err != nil {
		t.Fatalf("Init should not error: %v", err)
	}

	// With credentials, http should be created
	if c.http == nil {
		t.Error("http should not be nil with valid entryData credentials")
	}
}

// ============================================================================
// Deinit
// ============================================================================

func TestDeinit_ClearsSubTree(t *testing.T) {
	c := NewMIoTClient("test", nil, "uid", "cn", CtrlModeCloud)
	defer c.Stop()

	// Add a subscription
	h := func(params map[string]interface{}, ctx interface{}) {}
	c.subTree.Sub("did1/p/1", h, nil)

	if c.subTree.Size() != 1 {
		t.Fatal("subTree should have 1 entry")
	}

	c.Deinit()

	if c.subTree.Size() != 0 {
		t.Error("subTree should be cleared after Deinit")
	}
}

// ============================================================================
// Start / Stop
// ============================================================================

func TestStart(t *testing.T) {
	c := NewMIoTClient("test", nil, "uid", "cn", CtrlModeCloud)
	defer c.Stop()

	s := NewMIoTStorage(t.TempDir())
	c.SetStorage(s)

	err := c.Start()
	if err != nil {
		t.Fatalf("Start should not error: %v", err)
	}
}

func TestStop(t *testing.T) {
	c := NewMIoTClient("test", nil, "uid", "cn", CtrlModeCloud)
	defer c.Stop()

	err := c.Stop()
	if err != nil {
		t.Errorf("Stop should not error: %v", err)
	}
}

// ============================================================================
// LoadDevices (complement to existing test)
// ============================================================================

func TestLoadDevices_NoStorage(t *testing.T) {
	c := NewMIoTClient("test", nil, "uid", "cn", CtrlModeCloud)
	defer c.Stop()

	// LoadDevices without storage should not panic
	err := c.LoadDevices()
	// May error due to missing storage, but should not panic
	_ = err
}

// ============================================================================
// DeviceList copy
// ============================================================================

func TestDeviceList_ReturnsCopy(t *testing.T) {
	c := NewMIoTClient("test", nil, "uid", "cn", CtrlModeCloud)
	defer c.Stop()

	c.deviceListMu.Lock()
	c.deviceListCache["did1"] = map[string]interface{}{"name": "test"}
	c.deviceListMu.Unlock()

	list1 := c.DeviceList()
	list2 := c.DeviceList()

	// Modifying one copy should not affect the other
	list1["new"] = map[string]interface{}{}
	if _, ok := list2["new"]; ok {
		t.Error("DeviceList should return independent copies")
	}
}

// ============================================================================
// loadCacheDevice
// ============================================================================

func TestLoadCacheDevice_NoStorage(t *testing.T) {
	c := NewMIoTClient("test", nil, "uid", "cn", CtrlModeCloud)

	err := c.loadCacheDevice()
	if err == nil {
		t.Error("loadCacheDevice without storage should error")
	}

	c.Stop()
}

func TestLoadCacheDevice_WithStorage(t *testing.T) {
	c := NewMIoTClient("test", nil, "uid", "cn", CtrlModeCloud)
	defer c.Stop()

	s := NewMIoTStorage(t.TempDir())
	c.SetStorage(s)

	err := c.loadCacheDevice()
	if err != nil {
		t.Fatalf("loadCacheDevice should succeed: %v", err)
	}

	// Cache should be initialized (empty)
	if c.deviceListCache == nil {
		t.Error("deviceListCache should not be nil")
	}
}