package ragflow

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"strings"

	"github.com/gogf/gf/v2/net/gclient"
)

// Client RAGFlow API 客户端
type Client struct {
	BaseURL    string
	APIKey     string
	HTTPClient *gclient.Client
}

// NewClient 创建新的 RAGFlow 客户端
func NewClient(baseURL, apiKey string) *Client {
	client := gclient.New()
	client.SetHeader("Authorization", fmt.Sprintf("Bearer %s", apiKey))
	client.SetHeader("Content-Type", "application/json")

	return &Client{
		BaseURL:    strings.TrimSuffix(baseURL, "/"),
		APIKey:     apiKey,
		HTTPClient: client,
	}
}

// CommonResponse 通用响应结构
type CommonResponse struct {
	Code    int         `json:"code"`
	Message string      `json:"message"`
	Data    interface{} `json:"data,omitempty"`
}

// IsSuccess 检查响应是否成功
func (r *CommonResponse) IsSuccess() bool {
	return r.Code == 0
}

// request 发送 HTTP 请求
func (c *Client) request(ctx context.Context, method, path string, body interface{}, result interface{}) error {
	fullURL := c.BaseURL + path

	var reqBody io.Reader
	if body != nil {
		jsonData, err := json.Marshal(body)
		if err != nil {
			return fmt.Errorf("marshal request body failed: %w", err)
		}
		reqBody = strings.NewReader(string(jsonData))
	}

	var resp *gclient.Response
	var err error

	switch method {
	case "GET":
		resp, err = c.HTTPClient.Get(ctx, fullURL)
	case "POST":
		resp, err = c.HTTPClient.Post(ctx, fullURL, reqBody)
	case "PUT":
		resp, err = c.HTTPClient.Put(ctx, fullURL, reqBody)
	case "DELETE":
		resp, err = c.HTTPClient.Delete(ctx, fullURL, reqBody)
	default:
		return fmt.Errorf("unsupported method: %s", method)
	}

	if err != nil {
		return fmt.Errorf("http request failed: %w", err)
	}
	defer resp.Close()

	if resp.StatusCode != http.StatusOK {
		return fmt.Errorf("http request failed with status: %d", resp.StatusCode)
	}

	respBody := resp.ReadAll()
	if err != nil {
		return fmt.Errorf("read response body failed: %w", err)
	}

	if err := json.Unmarshal(respBody, result); err != nil {
		return fmt.Errorf("unmarshal response failed: %w", err)
	}

	return nil
}

// buildQueryString 构建查询字符串
func buildQueryString(params map[string]interface{}) string {
	if len(params) == 0 {
		return ""
	}

	var parts []string
	for k, v := range params {
		parts = append(parts, fmt.Sprintf("%s=%v", url.QueryEscape(k), url.QueryEscape(fmt.Sprintf("%v", v))))
	}
	return strings.Join(parts, "&")
}