package handlers

import (
	"encoding/json"
	"net/http"

	"prompt-generator/internal/llm"
	"prompt-generator/internal/models"
)

func GetSuggestions(w http.ResponseWriter, r *http.Request) {
	var req struct {
		CurrentPrompt string `json:"current_prompt"`
		ClaudeMD      string `json:"claude_md"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		fail(w, 400, "请求格式错误")
		return
	}

	if req.CurrentPrompt == "" {
		fail(w, 400, "当前 Prompt 不能为空")
		return
	}

	client := llm.NewClient(cfg.LLMAPIBaseURL, cfg.LLMAPIKey, cfg.LLMModelName)
	suggestions, err := client.GetSuggestions(req.CurrentPrompt, req.ClaudeMD)
	if err != nil {
		fail(w, 500, "获取建议失败: "+err.Error())
		return
	}

	success(w, suggestions)
}

// parseSuggestions 尝试从 LLM 响应中解析建议列表
func parseSuggestions(data string) []models.Suggestion {
	// Try to find JSON array in the response
	start := -1
	end := -1
	for i := 0; i < len(data); i++ {
		if data[i] == '[' && start == -1 {
			start = i
		}
		if data[i] == ']' {
			end = i + 1
		}
	}

	if start == -1 || end == -1 {
		return nil
	}

	var suggestions []models.Suggestion
	if err := json.Unmarshal([]byte(data[start:end]), &suggestions); err != nil {
		return nil
	}
	return suggestions
}