package llm

import (
	"context"
	"fmt"
)

// Gateway provides LLM functionality
type Gateway interface {
	Generate(ctx context.Context, prompt string, options *GenerateOptions) (*GenerateResponse, error)
}

// GenerateOptions contains options for generation
type GenerateOptions struct {
	Temperature   float64
	MaxTokens     int
	Tools         []Tool
	TenantID      string
	UserID        string
	ConversationHistory []Message
}

// Tool represents a callable tool/function
type Tool struct {
	Name        string
	Description string
	Parameters  map[string]interface{}
}

// Message represents a conversation message
type Message struct {
	Role    string // "user" or "assistant"
	Content string
}

// GenerateResponse contains the LLM response
type GenerateResponse struct {
	Text      string
	Tools     []ToolCall
	Emotion   *Emotion
	Gestures  []string
}

// ToolCall represents a tool call request
type ToolCall struct {
	Name      string
	Arguments map[string]interface{}
}

// Emotion represents emotional state for avatar
type Emotion struct {
	Valence float64 // -1.0 to 1.0
	Arousal float64 // 0.0 to 1.0
}

// MockLLMGateway is a mock implementation for development
type MockLLMGateway struct{}

// NewMockLLMGateway creates a new mock LLM gateway
func NewMockLLMGateway() *MockLLMGateway {
	return &MockLLMGateway{}
}

// Generate generates a response using mock LLM
func (g *MockLLMGateway) Generate(ctx context.Context, prompt string, options *GenerateOptions) (*GenerateResponse, error) {
	// Mock implementation
	return &GenerateResponse{
		Text: "I understand. How can I assist you with your banking needs today?",
		Emotion: &Emotion{
			Valence: 0.5,
			Arousal: 0.3,
		},
		Gestures: []string{"nod"},
	}, nil
}

// OpenAIGateway integrates with OpenAI (example - requires API key)
type OpenAIGateway struct {
	apiKey  string
	model   string
}

// NewOpenAIGateway creates a new OpenAI gateway
func NewOpenAIGateway(apiKey, model string) *OpenAIGateway {
	return &OpenAIGateway{
		apiKey: apiKey,
		model:  model,
	}
}

// Generate generates using OpenAI API
func (g *OpenAIGateway) Generate(ctx context.Context, prompt string, options *GenerateOptions) (*GenerateResponse, error) {
	// TODO: Implement OpenAI API integration
	// This would involve:
	// 1. Building the prompt with system message, conversation history
	// 2. Adding tool definitions if tools are provided
	// 3. Making API call to OpenAI
	// 4. Parsing response and extracting tool calls
	// 5. Mapping to GenerateResponse format
	return nil, fmt.Errorf("not implemented - requires OpenAI API integration")
}