package llm

import (
	"context"
	"fmt"
	"os"

	"github.com/rockliang/poimen/workflows/statemachine"
)

// AnthropicClient is a thin wrapper around the Anthropic API.
type AnthropicClient struct {
	apiKey string
}

// NewClient creates a new AnthropicClient from the ANTHROPIC_API_KEY env var.
func NewClient() (*AnthropicClient, error) {
	apiKey := os.Getenv("ANTHROPIC_API_KEY")
	if apiKey == "" {
		return nil, fmt.Errorf("ANTHROPIC_API_KEY environment variable not set")
	}

	return &AnthropicClient{
		apiKey: apiKey,
	}, nil
}

// MessageInput is the input to CreateMessage.
type MessageInput struct {
	Model        statemachine.ModelSpec
	SystemPrompt string
	Messages     []MessageParam
}

// MessageParam represents a message parameter (simplified).
type MessageParam struct {
	Role    string
	Content string
}

// CreateMessage calls the Anthropic API and returns the response text.
// Note: This is a stub implementation that would be fully implemented with actual API calls.
func (c *AnthropicClient) CreateMessage(ctx context.Context, in MessageInput) (string, error) {
	if c.apiKey == "" {
		return "", fmt.Errorf("API key not set")
	}

	// Placeholder implementation
	// In a real implementation, this would call the Anthropic API
	// For now, we return a mock response to allow testing
	return fmt.Sprintf("Mock response for model %s: Processing request with %d messages", in.Model.ModelID, len(in.Messages)), nil
}