package ai

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"paraclub-ai-mailer/config"
)

type AI struct {
	config config.AIConfig
	client *http.Client
}

type OpenRouterRequest struct {
	Model       string    `json:"model"`
	Messages    []Message `json:"messages"`
	Temperature float32   `json:"temperature"`
	MaxTokens   int       `json:"max_tokens"`
}

type Message struct {
	Role    string `json:"role"`
	Content string `json:"content"`
}

type OpenRouterResponse struct {
	Choices []struct {
		Message struct {
			Content string `json:"content"`
		} `json:"message"`
	} `json:"choices"`
}

func New(cfg config.AIConfig) *AI {
	return &AI{
		config: cfg,
		client: &http.Client{},
	}
}

func (a *AI) GenerateReply(emailContent string, contextContent map[string]string) (string, error) {
	// Prepare context from all URLs
	var context string
	for url, content := range contextContent {
		context += fmt.Sprintf("\nContext from %s:\n%s\n", url, content)
	}

	// Prepare the system message and user message
	systemMsg := "You are a helpful assistant. Use the provided context to help answer the email professionally and accurately."
	userMsg := fmt.Sprintf("Using the following context:\n%s\n\nPlease generate a reply for this email:\n%s", context, emailContent)

	messages := []Message{
		{Role: "system", Content: systemMsg},
		{Role: "user", Content: userMsg},
	}

	reqBody := OpenRouterRequest{
		Model:       a.config.Model,
		Messages:    messages,
		Temperature: a.config.Temperature,
		MaxTokens:   a.config.MaxTokens,
	}

	jsonData, err := json.Marshal(reqBody)
	if err != nil {
		return "", err
	}

	req, err := http.NewRequest("POST", "https://openrouter.ai/api/v1/chat/completions", bytes.NewBuffer(jsonData))
	if err != nil {
		return "", err
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", a.config.OpenRouterAPIKey))

	resp, err := a.client.Do(req)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	if resp.StatusCode != http.StatusOK {
		return "", fmt.Errorf("OpenRouter API returned status code: %d", resp.StatusCode)
	}

	var result OpenRouterResponse
	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return "", err
	}

	if len(result.Choices) == 0 {
		return "", fmt.Errorf("no response generated")
	}

	return result.Choices[0].Message.Content, nil
}