package utils

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"os"
	"path/filepath"
	"time"
)

// HTTPClient 封装HTTP客户端
type HTTPClient struct {
	client        *http.Client
	baseURL       string
	Authorization string
}

// NewHTTPClient 创建新的HTTP客户端
func NewHTTPClient(baseURL, token string) *HTTPClient {
	return &HTTPClient{
		client: &http.Client{
			Timeout: 30 * time.Second,
		},
		baseURL:       baseURL,
		Authorization: token,
	}
}

// SetToken 设置认证token
func (c *HTTPClient) SetToken(token string) {
	c.Authorization = token
}

// Get 发起GET请求
func (c *HTTPClient) Get(ctx context.Context, endpoint string, headers map[string]string) (*http.Response, error) {
	url := c.baseURL + endpoint
	req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
	if err != nil {
		return nil, fmt.Errorf("创建请求失败: %w", err)
	}

	// 设置默认headers
	req.Header.Set("Content-Type", "application/json")
	if c.Authorization != "" {
		req.Header.Set("Authorization", "Bearer "+c.Authorization)
	}

	// 设置自定义headers
	for key, value := range headers {
		req.Header.Set(key, value)
	}
	println("Header====>>>>", req.Header)
	return c.client.Do(req)
}

// Post 发起POST请求
func (c *HTTPClient) Post(ctx context.Context, endpoint string, data interface{}, headers map[string]string) (*http.Response, error) {
	url := c.baseURL + endpoint

	var reqBody io.Reader
	if data != nil {
		jsonData, err := json.Marshal(data)
		if err != nil {
			return nil, fmt.Errorf("序列化请求数据失败: %w", err)
		}
		reqBody = bytes.NewBuffer(jsonData)
	}

	req, err := http.NewRequestWithContext(ctx, "POST", url, reqBody)
	if err != nil {
		return nil, fmt.Errorf("创建请求失败: %w", err)
	}

	// 设置默认headers
	req.Header.Set("Content-Type", "application/json")
	if c.Authorization != "" {
		req.Header.Set("Authorization", "Bearer "+c.Authorization)
	}

	// 设置自定义headers
	for key, value := range headers {
		req.Header.Set(key, value)
	}

	return c.client.Do(req)
}

// UploadFile 上传文件
func (c *HTTPClient) UploadFile(ctx context.Context, endpoint string, filePath string, fieldName string, headers map[string]string, result interface{}) error {
	url := c.baseURL + endpoint

	// 打开文件
	file, err := os.Open(filePath)
	if err != nil {
		return fmt.Errorf("打开文件失败: %w", err)
	}
	defer file.Close()

	// 创建multipart表单
	var buf bytes.Buffer
	writer := multipart.NewWriter(&buf)

	// 添加文件字段
	fileWriter, err := writer.CreateFormFile(fieldName, filepath.Base(filePath))
	if err != nil {
		return fmt.Errorf("创建表单文件字段失败: %w", err)
	}

	// 复制文件内容到表单
	_, err = io.Copy(fileWriter, file)
	if err != nil {
		return fmt.Errorf("复制文件内容失败: %w", err)
	}

	// 关闭表单写入器
	err = writer.Close()
	if err != nil {
		return fmt.Errorf("关闭表单写入器失败: %w", err)
	}

	// 创建请求
	req, err := http.NewRequestWithContext(ctx, "POST", url, &buf)
	if err != nil {
		return fmt.Errorf("创建请求失败: %w", err)
	}

	// 设置内容类型为multipart表单
	req.Header.Set("Content-Type", writer.FormDataContentType())

	// 设置认证头
	if c.Authorization != "" {
		req.Header.Set("Authorization", "Bearer "+c.Authorization)
	}

	// 设置自定义headers
	for key, value := range headers {
		req.Header.Set(key, value)
	}

	resp, err := c.client.Do(req)
	if err != nil {
		return err
	}
	return c.ParseJSON(resp, result)
}

// ParseJSON 解析JSON响应
func (c *HTTPClient) ParseJSON(resp *http.Response, result interface{}) error {
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return fmt.Errorf("读取响应体失败: %w", err)
	}

	if resp.StatusCode >= 400 {
		return fmt.Errorf("请求失败 status=%d body=%s", resp.StatusCode, string(body))
	}

	if err := json.Unmarshal(body, result); err != nil {
		return fmt.Errorf("解析JSON失败: %w, body=%s", err, string(body))
	}

	return nil
}

// GetJSON 发起GET请求并解析JSON响应
func (c *HTTPClient) GetJSON(ctx context.Context, endpoint string, result interface{}, headers map[string]string) error {
	resp, err := c.Get(ctx, endpoint, headers)
	if err != nil {
		return err
	}
	return c.ParseJSON(resp, result)
}

// PostJSON 发起POST请求并解析JSON响应
func (c *HTTPClient) PostJSON(ctx context.Context, endpoint string, data interface{}, result interface{}, headers map[string]string) error {
	resp, err := c.Post(ctx, endpoint, data, headers)
	if err != nil {
		return err
	}
	return c.ParseJSON(resp, result)
}