package provider

import (
	"context"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"

	"github.com/gochat/gochat/internal/model/channel"
)

// MockChannelProvider is a mock implementation of ChannelProvider for testing.
type MockChannelProvider struct {
	mock.Mock
}

func (m *MockChannelProvider) Name() string {
	args := m.Called()
	return args.String(0)
}

func (m *MockChannelProvider) CreateChannel(ctx context.Context, accountID uint, params map[string]interface{}) (channel.Channelable, error) {
	args := m.Called(ctx, accountID, params)
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(channel.Channelable), args.Error(1)
}

func (m *MockChannelProvider) UpdateChannel(ctx context.Context, channelID uint, params map[string]interface{}) (channel.Channelable, error) {
	args := m.Called(ctx, channelID, params)
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(channel.Channelable), args.Error(1)
}

func (m *MockChannelProvider) DeleteChannel(ctx context.Context, channelID uint) error {
	args := m.Called(ctx, channelID)
	return args.Error(0)
}

func (m *MockChannelProvider) HandleWebhook(ctx context.Context, payload map[string]interface{}) error {
	args := m.Called(ctx, payload)
	return args.Error(0)
}

func (m *MockChannelProvider) ProcessIncomingMessage(ctx context.Context, inboxID uint, contactID uint, payload map[string]interface{}) (*IncomingMessageResult, error) {
	args := m.Called(ctx, inboxID, contactID, payload)
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(*IncomingMessageResult), args.Error(1)
}

func (m *MockChannelProvider) ProcessOutgoingMessage(ctx context.Context, conversationID uint, messageID uint, content string) error {
	args := m.Called(ctx, conversationID, messageID, content)
	return args.Error(0)
}

func (m *MockChannelProvider) ValidateConfig(params map[string]interface{}) error {
	args := m.Called(params)
	return args.Error(0)
}

// === MockChannelProvider Tests ===

func TestMockChannelProvider_Name(t *testing.T) {
	mockProvider := new(MockChannelProvider)
	mockProvider.On("Name").Return("web_widget")

	name := mockProvider.Name()
	assert.Equal(t, "web_widget", name)
	mockProvider.AssertExpectations(t)
}

func TestMockChannelProvider_CreateChannel(t *testing.T) {
	mockProvider := new(MockChannelProvider)
	ctx := context.Background()

	params := map[string]interface{}{
		"website_url": "https://example.com",
		"welcome_title": "Welcome",
	}

	// Create a mock Channelable result - we'll return nil for simplicity
	// since Channelable is an interface
	mockProvider.On("CreateChannel", ctx, uint(1), params).Return(nil, nil)

	result, err := mockProvider.CreateChannel(ctx, 1, params)
	assert.Nil(t, result)
	assert.NoError(t, err)
	mockProvider.AssertExpectations(t)
}

func TestMockChannelProvider_CreateChannel_Error(t *testing.T) {
	mockProvider := new(MockChannelProvider)
	ctx := context.Background()

	params := map[string]interface{}{
		"bot_token": "", // empty bot token should fail
	}

	mockProvider.On("CreateChannel", ctx, uint(1), params).Return(nil, assert.AnError)

	result, err := mockProvider.CreateChannel(ctx, 1, params)
	assert.Nil(t, result)
	assert.Error(t, err)
	mockProvider.AssertExpectations(t)
}

func TestMockChannelProvider_UpdateChannel(t *testing.T) {
	mockProvider := new(MockChannelProvider)
	ctx := context.Background()

	params := map[string]interface{}{
		"welcome_title": "Updated Welcome",
	}

	mockProvider.On("UpdateChannel", ctx, uint(1), params).Return(nil, nil)

	result, err := mockProvider.UpdateChannel(ctx, 1, params)
	assert.Nil(t, result)
	assert.NoError(t, err)
	mockProvider.AssertExpectations(t)
}

func TestMockChannelProvider_DeleteChannel(t *testing.T) {
	mockProvider := new(MockChannelProvider)
	ctx := context.Background()

	mockProvider.On("DeleteChannel", ctx, uint(1)).Return(nil)

	err := mockProvider.DeleteChannel(ctx, 1)
	assert.NoError(t, err)
	mockProvider.AssertExpectations(t)
}

func TestMockChannelProvider_DeleteChannel_Error(t *testing.T) {
	mockProvider := new(MockChannelProvider)
	ctx := context.Background()

	mockProvider.On("DeleteChannel", ctx, uint(999)).Return(assert.AnError)

	err := mockProvider.DeleteChannel(ctx, 999)
	assert.Error(t, err)
	mockProvider.AssertExpectations(t)
}

func TestMockChannelProvider_HandleWebhook(t *testing.T) {
	mockProvider := new(MockChannelProvider)
	ctx := context.Background()

	payload := map[string]interface{}{
		"message": map[string]interface{}{
			"text": "Hello from Telegram",
			"chat": map[string]interface{}{
				"id": 12345,
			},
		},
	}

	mockProvider.On("HandleWebhook", ctx, payload).Return(nil)

	err := mockProvider.HandleWebhook(ctx, payload)
	assert.NoError(t, err)
	mockProvider.AssertExpectations(t)
}

func TestMockChannelProvider_ProcessIncomingMessage(t *testing.T) {
	mockProvider := new(MockChannelProvider)
	ctx := context.Background()

	payload := map[string]interface{}{
		"text": "Hello",
		"from": map[string]interface{}{
			"id":   100,
			"name": "Test User",
		},
	}

	expectedResult := &IncomingMessageResult{
		Content:     "Hello",
		ContentType: "text",
		SourceID:    "100",
		Extras:      map[string]interface{}{"sender_name": "Test User"},
	}

	mockProvider.On("ProcessIncomingMessage", ctx, uint(1), uint(2), payload).Return(expectedResult, nil)

	result, err := mockProvider.ProcessIncomingMessage(ctx, 1, 2, payload)
	assert.NoError(t, err)
	assert.Equal(t, "Hello", result.Content)
	assert.Equal(t, "text", result.ContentType)
	assert.Equal(t, "100", result.SourceID)
	mockProvider.AssertExpectations(t)
}

func TestMockChannelProvider_ProcessOutgoingMessage(t *testing.T) {
	mockProvider := new(MockChannelProvider)
	ctx := context.Background()

	mockProvider.On("ProcessOutgoingMessage", ctx, uint(1), uint(10), "Reply message").Return(nil)

	err := mockProvider.ProcessOutgoingMessage(ctx, 1, 10, "Reply message")
	assert.NoError(t, err)
	mockProvider.AssertExpectations(t)
}

func TestMockChannelProvider_ValidateConfig(t *testing.T) {
	mockProvider := new(MockChannelProvider)

	// Valid config
	validParams := map[string]interface{}{
		"bot_token": "123456:ABC-DEF",
	}
	mockProvider.On("ValidateConfig", validParams).Return(nil)

	err := mockProvider.ValidateConfig(validParams)
	assert.NoError(t, err)
	mockProvider.AssertExpectations(t)
}

func TestMockChannelProvider_ValidateConfig_Invalid(t *testing.T) {
	mockProvider := new(MockChannelProvider)

	// Invalid config - empty bot token
	invalidParams := map[string]interface{}{
		"bot_token": "",
	}
	mockProvider.On("ValidateConfig", invalidParams).Return(assert.AnError)

	err := mockProvider.ValidateConfig(invalidParams)
	assert.Error(t, err)
	mockProvider.AssertExpectations(t)
}

// === Multi-provider registration tests ===

func TestMultipleProvidersDifferentNames(t *testing.T) {
	webWidgetProvider := new(MockChannelProvider)
	telegramProvider := new(MockChannelProvider)

	webWidgetProvider.On("Name").Return("web_widget")
	telegramProvider.On("Name").Return("telegram")

	assert.Equal(t, "web_widget", webWidgetProvider.Name())
	assert.Equal(t, "telegram", telegramProvider.Name())

	webWidgetProvider.AssertExpectations(t)
	telegramProvider.AssertExpectations(t)
}

// === Provider lifecycle tests (Chatwoot pattern) ===

func TestProviderCreateUpdateDeleteLifecycle(t *testing.T) {
	mockProvider := new(MockChannelProvider)
	ctx := context.Background()

	// Step 1: Create
	createParams := map[string]interface{}{
		"website_url": "https://example.com",
	}
	mockProvider.On("CreateChannel", ctx, uint(1), createParams).Return(nil, nil)

	_, err := mockProvider.CreateChannel(ctx, 1, createParams)
	assert.NoError(t, err)

	// Step 2: Update
	updateParams := map[string]interface{}{
		"welcome_title": "New Welcome",
	}
	mockProvider.On("UpdateChannel", ctx, uint(1), updateParams).Return(nil, nil)

	_, err = mockProvider.UpdateChannel(ctx, 1, updateParams)
	assert.NoError(t, err)

	// Step 3: Delete
	mockProvider.On("DeleteChannel", ctx, uint(1)).Return(nil)

	err = mockProvider.DeleteChannel(ctx, 1)
	assert.NoError(t, err)

	mockProvider.AssertExpectations(t)
}

// === Webhook + message processing pipeline test (Chatwoot pattern) ===

func TestProviderWebhookToMessagePipeline(t *testing.T) {
	mockProvider := new(MockChannelProvider)
	ctx := context.Background()

	// Step 1: Handle incoming webhook
	webhookPayload := map[string]interface{}{
		"update_id": 12345,
		"message": map[string]interface{}{
			"text": "Customer question",
			"from": map[string]interface{}{
				"id":   999,
				"name": "Customer",
			},
		},
	}
	mockProvider.On("HandleWebhook", ctx, webhookPayload).Return(nil)

	err := mockProvider.HandleWebhook(ctx, webhookPayload)
	assert.NoError(t, err)

	// Step 2: Process the incoming message
	incomingResult := &IncomingMessageResult{
		Content:     "Customer question",
		ContentType: "text",
		SourceID:    "999",
		Extras:      map[string]interface{}{"sender_name": "Customer"},
	}
	mockProvider.On("ProcessIncomingMessage", ctx, uint(1), uint(5), webhookPayload).Return(incomingResult, nil)

	result, err := mockProvider.ProcessIncomingMessage(ctx, 1, 5, webhookPayload)
	assert.NoError(t, err)
	assert.Equal(t, "Customer question", result.Content)

	// Step 3: Send outgoing reply
	mockProvider.On("ProcessOutgoingMessage", ctx, uint(1), uint(100), "Agent reply").Return(nil)

	err = mockProvider.ProcessOutgoingMessage(ctx, 1, 100, "Agent reply")
	assert.NoError(t, err)

	mockProvider.AssertExpectations(t)
}