package workflow

import (
	"context"
	"encoding/json"
	"fmt"
	"testing"
)

// TestIsStructuredOutput tests the isStructuredOutput helper function
func TestIsStructuredOutput(t *testing.T) {
	tests := []struct {
		name     string
		params   map[string]interface{}
		expected bool
	}{
		{
			name: "JSONSchemaFormat",
			params: map[string]interface{}{
				"response_format": map[string]interface{}{
					"type": "json_schema",
				},
			},
			expected: true,
		},
		{
			name: "TextFormat",
			params: map[string]interface{}{
				"response_format": map[string]interface{}{
					"type": "text",
				},
			},
			expected: false,
		},
		{
			name:     "NoResponseFormat",
			params:   map[string]interface{}{},
			expected: false,
		},
		{
			name: "OutputConfigJSONSchema",
			params: map[string]interface{}{
				"output_config": map[string]interface{}{
					"format": map[string]interface{}{
						"type": "json_schema",
					},
				},
			},
			expected: true,
		},
		{
			name: "OutputConfigText",
			params: map[string]interface{}{
				"output_config": map[string]interface{}{
					"format": map[string]interface{}{
						"type": "text",
					},
				},
			},
			expected: false,
		},
		{
			name: "BothFormats",
			params: map[string]interface{}{
				"response_format": map[string]interface{}{
					"type": "json_schema",
				},
				"output_config": map[string]interface{}{
					"format": map[string]interface{}{
						"type": "json_schema",
					},
				},
			},
			expected: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := isStructuredOutput(tt.params); got != tt.expected {
				t.Errorf("isStructuredOutput() = %v, want %v", got, tt.expected)
			}
		})
	}
}

// TestStructuredOutputIntegration tests the v3.7 structured output feature integration
func TestStructuredOutputIntegration(t *testing.T) {
	// Create mock LLM adapter that simulates structured output
	mockAdapter := NewDefaultLLMAdapter()
	mockJSON := `{"score": 85, "summary": "Good code quality"}`

	mockAdapter.SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		result := map[string]interface{}{
			"content":       mockJSON,
			"model":         "gpt-4",
			"finish_reason": "stop",
		}

		// Simulate structured output parsing (like OpenAIAdapter does)
		if isStructuredOutput(params) {
			var parsed interface{}
			if err := json.Unmarshal([]byte(mockJSON), &parsed); err != nil {
				return nil, err
			}
			result["content"] = parsed
		}

		return result, nil
	})

	// Create workflow with LLM step using structured output
	wf := &Workflow{
		Version: "3.7",
		Name:    "Structured Output Test",
		Registry: Registry{
			Vars: []string{
				"$result(OBJECT)",
			},
		},
		Steps: []Step{
			{
				ID: "LLM_Test",
				In: StepInput{
					"model": "gpt-4",
					"messages": []interface{}{
						map[string]interface{}{
							"role":    "user",
							"content": "Generate a code review",
						},
					},
					"response_format": map[string]interface{}{
						"type": "json_schema",
						"json_schema": map[string]interface{}{
							"name":        "code_review",
							"description": "A code review response",
							"schema": map[string]interface{}{
								"type": "object",
								"properties": map[string]interface{}{
									"score": map[string]interface{}{
										"type": "integer",
									},
									"summary": map[string]interface{}{
										"type": "string",
									},
								},
								"required": []interface{}{"score", "summary"},
							},
						},
					},
				},
				Out: StepOutput{
					"$result": "=_result",
				},
				Next: "Stop_End",
			},
			{
				ID: "Stop_End",
			},
		},
	}

	engine, err := NewEngine(wf)
	if err != nil {
		t.Fatalf("Failed to create engine: %v", err)
	}

	adapters := &Adapters{
		LLM:     mockAdapter,
		Service: NewDefaultServiceAdapter(),
	}

	// Execute workflow
	result, err := engine.Execute(context.Background(), nil, adapters)
	if err != nil {
		t.Fatalf("Workflow execution failed: %v", err)
	}

	// Consume events to wait for workflow completion
	for range result.RunEventStream {
	}

	// Check that $result contains the parsed JSON object
	resultVar, ok := result.Context.Variables["$result"]
	if !ok {
		t.Fatal("$result not found in variables")
	}

	// Verify it's a parsed object (map), not a string
	resultMap, ok := resultVar.(map[string]interface{})
	if !ok {
		t.Fatalf("Expected $result to be a map[string]interface{}, got %T", resultVar)
	}

	// Check the parsed fields
	if score, ok := resultMap["score"].(float64); !ok || score != 85 {
		t.Errorf("Expected score to be 85, got %v", resultMap["score"])
	}
	if summary, ok := resultMap["summary"].(string); !ok || summary != "Good code quality" {
		t.Errorf("Expected summary to be 'Good code quality', got %v", resultMap["summary"])
	}
}

// TestOutputConfigIntegration tests the v3.8 output_config direct passthrough feature
func TestOutputConfigIntegration(t *testing.T) {
	// Create mock LLM adapter that simulates structured output
	mockAdapter := NewDefaultLLMAdapter()
	mockJSON := `{"score": 92, "feedback": "Excellent implementation"}`

	mockAdapter.SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		result := map[string]interface{}{
			"content":       mockJSON,
			"model":         "claude-sonnet-4-5",
			"finish_reason": "stop",
		}

		// Simulate structured output parsing (like OpenAIAdapter does)
		if isStructuredOutput(params) {
			var parsed interface{}
			if err := json.Unmarshal([]byte(mockJSON), &parsed); err != nil {
				return nil, err
			}
			result["content"] = parsed
		}

		return result, nil
	})

	// Create workflow with LLM step using output_config (Anthropic style)
	wf := &Workflow{
		Version: "3.8",
		Name:    "Output Config Test",
		Registry: Registry{
			Vars: []string{
				"$result(OBJECT)",
			},
		},
		Steps: []Step{
			{
				ID: "LLM_Test",
				In: StepInput{
					"model": "claude-sonnet-4-5",
					"messages": []interface{}{
						map[string]interface{}{
							"role":    "user",
							"content": "Generate a performance review",
						},
					},
					"output_config": map[string]interface{}{
						"format": map[string]interface{}{
							"type": "json_schema",
							"schema": map[string]interface{}{
								"type": "object",
								"properties": map[string]interface{}{
									"score": map[string]interface{}{
										"type": "integer",
									},
									"feedback": map[string]interface{}{
										"type": "string",
									},
								},
								"required":             []interface{}{"score", "feedback"},
								"additionalProperties": false,
							},
						},
					},
				},
				Out: StepOutput{
					"$result": "=_result",
				},
				Next: "Stop_End",
			},
			{
				ID: "Stop_End",
			},
		},
	}

	engine, err := NewEngine(wf)
	if err != nil {
		t.Fatalf("Failed to create engine: %v", err)
	}

	adapters := &Adapters{
		LLM:     mockAdapter,
		Service: NewDefaultServiceAdapter(),
	}

	// Execute workflow
	result, err := engine.Execute(context.Background(), nil, adapters)
	if err != nil {
		t.Fatalf("Workflow execution failed: %v", err)
	}

	// Consume events to wait for workflow completion
	for range result.RunEventStream {
	}

	// Check that $result contains the parsed JSON object
	resultVar, ok := result.Context.Variables["$result"]
	if !ok {
		t.Fatal("$result not found in variables")
	}

	// Verify it's a parsed object (map), not a string
	resultMap, ok := resultVar.(map[string]interface{})
	if !ok {
		t.Fatalf("Expected $result to be a map[string]interface{}, got %T", resultVar)
	}

	// Check the parsed fields
	if score, ok := resultMap["score"].(float64); !ok || score != 92 {
		t.Errorf("Expected score to be 92, got %v", resultMap["score"])
	}
	if feedback, ok := resultMap["feedback"].(string); !ok || feedback != "Excellent implementation" {
		t.Errorf("Expected feedback to be 'Excellent implementation', got %v", resultMap["feedback"])
	}
}

// TestApplyOutputConfig tests the applyOutputConfig method
func TestApplyOutputConfig(t *testing.T) {
	adapter := NewOpenAIAdapter(OpenAIConfig{
		BaseURL: "http://localhost:4000",
	})

	tests := []struct {
		name         string
		outputConfig map[string]interface{}
		wantError    bool
		validate     func(t *testing.T, req *ChatCompletionRequest)
	}{
		{
			name: "ValidJSONSchema",
			outputConfig: map[string]interface{}{
				"format": map[string]interface{}{
					"type": "json_schema",
					"schema": map[string]interface{}{
						"type": "object",
						"properties": map[string]interface{}{
							"result": map[string]interface{}{"type": "string"},
						},
						"additionalProperties": false,
					},
				},
			},
			wantError: false,
			validate: func(t *testing.T, req *ChatCompletionRequest) {
				if req.OutputConfig == nil {
					t.Error("Expected OutputConfig to be set")
					return
				}
				if req.OutputConfig.Format == nil {
					t.Error("Expected OutputConfig.Format to be set")
					return
				}
				if req.OutputConfig.Format.Type != "json_schema" {
					t.Errorf("Expected Format.Type = json_schema, got %s", req.OutputConfig.Format.Type)
				}
				if req.OutputConfig.Format.Schema == nil {
					t.Error("Expected Schema to be set")
					return
				}
			},
		},
		{
			name: "TextFormat",
			outputConfig: map[string]interface{}{
				"format": map[string]interface{}{
					"type": "text",
				},
			},
			wantError: false,
			validate: func(t *testing.T, req *ChatCompletionRequest) {
				// Text format should not set OutputConfig
				if req.OutputConfig != nil {
					t.Error("Expected OutputConfig to be nil for text format")
				}
			},
		},
		{
			name: "MissingFormat",
			outputConfig: map[string]interface{}{
				"type": "json_schema",
			},
			wantError: true,
		},
		{
			name: "MissingSchema",
			outputConfig: map[string]interface{}{
				"format": map[string]interface{}{
					"type": "json_schema",
				},
			},
			wantError: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			req := &ChatCompletionRequest{
				Model: "claude-sonnet-4-5",
			}

			err := adapter.applyOutputConfig(req, tt.outputConfig)
			if (err != nil) != tt.wantError {
				t.Errorf("applyOutputConfig() error = %v, wantError %v", err, tt.wantError)
				return
			}

			if !tt.wantError && tt.validate != nil {
				tt.validate(t, req)
			}
		})
	}
}

// TestStructuredOutputToStringVariable tests that structured output (JSON object) is correctly
// marshaled to JSON string when assigned to a STRING variable
func TestStructuredOutputToStringVariable(t *testing.T) {
	// Create mock LLM adapter that simulates structured output
	mockAdapter := NewDefaultLLMAdapter()
	mockJSON := `{"name": "John", "age": 30, "active": true}`

	mockAdapter.SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		result := map[string]interface{}{
			"content":       mockJSON,
			"model":         "claude-sonnet-4-5",
			"finish_reason": "stop",
		}

		// Simulate structured output parsing
		if isStructuredOutput(params) {
			var parsed interface{}
			if err := json.Unmarshal([]byte(mockJSON), &parsed); err != nil {
				return nil, err
			}
			result["content"] = parsed
		}

		return result, nil
	})

	// Create workflow with LLM step that outputs to a STRING variable
	wf := &Workflow{
		Version: "3.8",
		Name:    "Structured Output to String Test",
		Registry: Registry{
			Vars: []string{
				"$userInfo(STRING)", // Declaring as STRING type
			},
		},
		Steps: []Step{
			{
				ID: "LLM_GetUser",
				In: StepInput{
					"model": "claude-sonnet-4-5",
					"messages": []interface{}{
						map[string]interface{}{
							"role":    "user",
							"content": "Get user info",
						},
					},
					"output_config": map[string]interface{}{
						"format": map[string]interface{}{
							"type": "json_schema",
							"schema": map[string]interface{}{
								"type": "object",
								"properties": map[string]interface{}{
									"name": map[string]interface{}{
										"type": "string",
									},
									"age": map[string]interface{}{
										"type": "integer",
									},
									"active": map[string]interface{}{
										"type": "boolean",
									},
								},
								"required":             []interface{}{"name", "age", "active"},
								"additionalProperties": false,
							},
						},
					},
				},
				Out: StepOutput{
					"$userInfo": "=_result", // Assigning JSON object to STRING variable
				},
				Next: "Stop_End",
			},
			{
				ID: "Stop_End",
			},
		},
	}

	engine, err := NewEngine(wf)
	if err != nil {
		t.Fatalf("Failed to create engine: %v", err)
	}

	adapters := &Adapters{
		LLM:     mockAdapter,
		Service: NewDefaultServiceAdapter(),
	}

	// Execute workflow
	result, err := engine.Execute(context.Background(), nil, adapters)
	if err != nil {
		t.Fatalf("Workflow execution failed: %v", err)
	}

	// Consume events to wait for workflow completion
	for range result.RunEventStream {
	}

	// Check that $userInfo is a STRING (JSON marshaled)
	userInfo, ok := result.Context.Variables["$userInfo"]
	if !ok {
		t.Fatal("$userInfo not found in variables")
	}

	// Verify it's a string (JSON marshaled from object)
	userInfoStr, ok := userInfo.(string)
	if !ok {
		t.Fatalf("Expected $userInfo to be a string, got %T", userInfo)
	}

	// Parse the JSON string to verify it's valid JSON
	var parsed map[string]interface{}
	if err := json.Unmarshal([]byte(userInfoStr), &parsed); err != nil {
		t.Fatalf("Expected $userInfo to be valid JSON string, got parse error: %v (value: %q)", err, userInfoStr)
	}

	// Verify the content is correct
	if name, ok := parsed["name"].(string); !ok || name != "John" {
		t.Errorf("Expected name to be 'John', got %v", parsed["name"])
	}
	if age, ok := parsed["age"].(float64); !ok || age != 30 {
		t.Errorf("Expected age to be 30, got %v", parsed["age"])
	}
	if active, ok := parsed["active"].(bool); !ok || active != true {
		t.Errorf("Expected active to be true, got %v", parsed["active"])
	}
}

// TestVendorParameterMapping tests that response_format is correctly mapped to vendor-specific formats
func TestVendorParameterMapping(t *testing.T) {
	tests := []struct {
		name               string
		model              string
		responseFormat     map[string]interface{}
		expectOutputConfig bool
		expectResponseFormat bool
	}{
		{
			name:  "AnthropicModel",
			model: "claude-3-5-sonnet-20241022",
			responseFormat: map[string]interface{}{
				"type": "json_schema",
				"json_schema": map[string]interface{}{
					"name": "test_schema",
					"schema": map[string]interface{}{
						"type": "object",
						"properties": map[string]interface{}{
							"result": map[string]interface{}{"type": "string"},
						},
					},
				},
			},
			expectOutputConfig: true,
			expectResponseFormat: false,
		},
		{
			name:  "OpenAIModel",
			model: "gpt-4o",
			responseFormat: map[string]interface{}{
				"type": "json_schema",
				"json_schema": map[string]interface{}{
					"name": "test_schema",
					"schema": map[string]interface{}{
						"type": "object",
						"properties": map[string]interface{}{
							"result": map[string]interface{}{"type": "string"},
						},
					},
				},
			},
			expectOutputConfig: false,
			expectResponseFormat: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			adapter := NewOpenAIAdapter(OpenAIConfig{
				BaseURL: "http://localhost:4000",
			})

			req := &ChatCompletionRequest{
				Model: tt.model,
			}

			err := adapter.applyResponseFormat(req, tt.responseFormat)
			if err != nil {
				t.Fatalf("applyResponseFormat failed: %v", err)
			}

			if tt.expectOutputConfig {
				if req.OutputConfig == nil {
					t.Error("Expected OutputConfig to be set for Anthropic model")
				} else if req.OutputConfig.Format == nil {
					t.Error("Expected OutputConfig.Format to be set")
				} else if req.OutputConfig.Format.Type != "json_schema" {
					t.Errorf("Expected OutputConfig.Format.Type = json_schema, got %s", req.OutputConfig.Format.Type)
				}
			}

			if tt.expectResponseFormat {
				if req.ResponseFormat == nil {
					t.Error("Expected ResponseFormat to be set for OpenAI model")
				} else if req.ResponseFormat.Type != "json_schema" {
					t.Errorf("Expected ResponseFormat.Type = json_schema, got %s", req.ResponseFormat.Type)
				}
			}
		})
	}
}

// TestSchemaRefResolution tests the v3.9 schemaRef resolution feature
func TestSchemaRefResolution(t *testing.T) {
	// Create mock LLM adapter
	mockAdapter := NewDefaultLLMAdapter()
	mockJSON := `{"projectName": "MyApp", "estimatedDays": 5}`

	mockAdapter.SetHandler(func(ctx context.Context, params map[string]interface{}, stream chan<- string) (map[string]interface{}, error) {
		// Verify that schema was resolved (not schemaRef)
		if outputConfig, ok := params["output_config"].(map[string]interface{}); ok {
			if format, ok := outputConfig["format"].(map[string]interface{}); ok {
				if _, hasSchemaRef := format["schemaRef"]; hasSchemaRef {
					t.Error("schemaRef should have been resolved before calling LLM adapter")
				}
				if _, hasSchema := format["schema"]; !hasSchema {
					t.Error("schema should be present after schemaRef resolution")
				}
			}
		}

		result := map[string]interface{}{
			"content":       mockJSON,
			"model":         "claude-sonnet-4-5",
			"finish_reason": "stop",
		}

		if isStructuredOutput(params) {
			var parsed interface{}
			if err := json.Unmarshal([]byte(mockJSON), &parsed); err != nil {
				return nil, err
			}
			result["content"] = parsed
		}

		return result, nil
	})

	// Create workflow with schemaRef
	wf := &Workflow{
		Version: "3.9",
		Name:    "SchemaRef Test",
		Registry: Registry{
			Vars: []string{
				"$plan(OBJECT)",
			},
			Schemas: map[string]map[string]interface{}{
				"PlanSchema": {
					"type": "object",
					"properties": map[string]interface{}{
						"projectName": map[string]interface{}{
							"type": "string",
						},
						"estimatedDays": map[string]interface{}{
							"type": "integer",
						},
					},
					"required":             []interface{}{"projectName", "estimatedDays"},
					"additionalProperties": false,
				},
			},
		},
		Steps: []Step{
			{
				ID: "LLM_GeneratePlan",
				In: StepInput{
					"messages": []interface{}{
						map[string]interface{}{
							"role":    "user",
							"content": "Generate a project plan",
						},
					},
					"output_config": map[string]interface{}{
						"format": map[string]interface{}{
							"type":      "json_schema",
							"schemaRef": "PlanSchema",
						},
					},
				},
				Out: StepOutput{
					"$plan": "=_result",
				},
				Next: "Stop_End",
			},
			{
				ID: "Stop_End",
			},
		},
	}

	engine, err := NewEngine(wf)
	if err != nil {
		t.Fatalf("Failed to create engine: %v", err)
	}

	adapters := &Adapters{
		LLM:     mockAdapter,
		Service: NewDefaultServiceAdapter(),
	}

	// Execute workflow
	result, err := engine.Execute(context.Background(), nil, adapters)
	if err != nil {
		t.Fatalf("Workflow execution failed: %v", err)
	}

	// Consume events
	for range result.RunEventStream {
	}

	// Verify result
	planVar, ok := result.Context.Variables["$plan"]
	if !ok {
		t.Fatal("$plan not found in variables")
	}

	planMap, ok := planVar.(map[string]interface{})
	if !ok {
		t.Fatalf("Expected $plan to be a map, got %T", planVar)
	}

	if projectName, ok := planMap["projectName"].(string); !ok || projectName != "MyApp" {
		t.Errorf("Expected projectName to be 'MyApp', got %v", planMap["projectName"])
	}
	if estimatedDays, ok := planMap["estimatedDays"].(float64); !ok || estimatedDays != 5 {
		t.Errorf("Expected estimatedDays to be 5, got %v", planMap["estimatedDays"])
	}
}

// TestSchemaRefError tests error handling for invalid schemaRef
func TestSchemaRefError(t *testing.T) {
	tests := []struct {
		name          string
		schemas       map[string]map[string]interface{}
		schemaRef     string
		expectError   string
	}{
		{
			name:        "SchemaNotFound",
			schemas:     map[string]map[string]interface{}{},
			schemaRef:   "NonExistentSchema",
			expectError: "schema not found: NonExistentSchema",
		},
		{
			name: "BothSchemaAndSchemaRef",
			schemas: map[string]map[string]interface{}{
				"TestSchema": {
					"type": "object",
				},
			},
			schemaRef:   "", // Will be set in test
			expectError: "cannot have both 'schema' and 'schemaRef'",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			mockAdapter := NewDefaultLLMAdapter()

			outputConfig := map[string]interface{}{
				"format": map[string]interface{}{
					"type": "json_schema",
				},
			}

			if tt.name == "BothSchemaAndSchemaRef" {
				outputConfig["format"].(map[string]interface{})["schema"] = map[string]interface{}{"type": "object"}
				outputConfig["format"].(map[string]interface{})["schemaRef"] = "TestSchema"
			} else {
				outputConfig["format"].(map[string]interface{})["schemaRef"] = tt.schemaRef
			}

			wf := &Workflow{
				Version: "3.9",
				Name:    "SchemaRef Error Test",
				Registry: Registry{
					Schemas: tt.schemas,
				},
				Steps: []Step{
					{
						ID: "LLM_Test",
						In: StepInput{
							"messages":      []interface{}{},
							"output_config": outputConfig,
						},
						Next: "Stop_End",
					},
					{
						ID: "Stop_End",
					},
				},
			}

			engine, err := NewEngine(wf)
			if err != nil {
				t.Fatalf("Failed to create engine: %v", err)
			}

			adapters := &Adapters{
				LLM:     mockAdapter,
				Service: NewDefaultServiceAdapter(),
			}

			result, err := engine.Execute(context.Background(), nil, adapters)
			if err != nil {
				t.Fatalf("Engine.Execute failed: %v", err)
			}

			// Consume events and check for error
			foundError := false
			for event := range result.RunEventStream {
				if event.Type == RunEventStepError || event.Type == RunEventWorkflowFailed {
					if contains(fmt.Sprintf("%v", event.Payload), tt.expectError) {
						foundError = true
					}
				}
			}

			if !foundError {
				t.Errorf("Expected error containing %q, but no error occurred", tt.expectError)
			}
		})
	}
}

// TestIDEWorkflowValidation tests the v3.9 IDE workflow validation
func TestIDEWorkflowValidation(t *testing.T) {
	tests := []struct {
		name        string
		workflow    *Workflow
		expectError string
	}{
		{
			name: "IDEWorkflowWithServiceNode",
			workflow: &Workflow{
				Version:      "3.9",
				Name:         "IDE Test",
				WorkflowType: WorkflowTypeIDE,
				Registry:     Registry{},
				Steps: []Step{
					{
						ID:   "Service_Test",
						Next: "Stop_End",
					},
					{
						ID: "Stop_End",
					},
				},
			},
			expectError: "IDE workflow (WorkflowType: IDE) cannot contain Service_* nodes",
		},
		{
			name: "IDEWorkflowWithServicesRegistry",
			workflow: &Workflow{
				Version:      "3.9",
				Name:         "IDE Test",
				WorkflowType: WorkflowTypeIDE,
				Registry: Registry{
					Services: []string{
						"TestService() RETURN result(STRING)",
					},
				},
				Steps: []Step{
					{
						ID:   "LLM_Test",
						In:   StepInput{},
						Next: "Stop_End",
					},
					{
						ID: "Stop_End",
					},
				},
			},
			expectError: "IDE workflow (WorkflowType: IDE) must have empty registry.services",
		},
		{
			name: "IDEWorkflowValid",
			workflow: &Workflow{
				Version:      "3.9",
				Name:         "IDE Test",
				WorkflowType: WorkflowTypeIDE,
				Registry:     Registry{},
				Steps: []Step{
					{
						ID:   "LLM_Test",
						In:   StepInput{},
						Next: "Stop_End",
					},
					{
						ID: "Stop_End",
					},
				},
			},
			expectError: "",
		},
		{
			name: "BusinessWorkflowWithServiceNode",
			workflow: &Workflow{
				Version:      "3.9",
				Name:         "Business Test",
				WorkflowType: WorkflowTypeBusiness,
				Registry: Registry{
					Services: []string{
						"TestService() RETURN result(STRING)",
					},
				},
				Steps: []Step{
					{
						ID:   "Service_Test",
						Next: "Stop_End",
					},
					{
						ID: "Stop_End",
					},
				},
			},
			expectError: "",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			_, err := NewEngine(tt.workflow)

			if tt.expectError == "" {
				if err != nil {
					t.Errorf("Expected no error, got: %v", err)
				}
			} else {
				if err == nil {
					t.Errorf("Expected error containing %q, got no error", tt.expectError)
				} else if !contains(err.Error(), tt.expectError) {
					t.Errorf("Expected error containing %q, got: %v", tt.expectError, err)
				}
			}
		})
	}
}