package http

import (
	"encoding/base64"
	"fmt"
	"net/http"
	"sync"
	"time"

	"git.x2erp.com/qdy/go-base/config"
	"github.com/go-resty/resty/v2"
)

// HTTPClient 简化的HTTP客户端
type HTTPClient struct {
	client *resty.Client
}

// HTTPFactory HTTP客户端工厂
type HTTPFactory struct {
	config config.IConfig
	client *resty.Client
}

var (
	httpFactoryInstance *HTTPFactory
	httpFactoryOnce     sync.Once
	httpFactoryInitErr  error
)

// GetHTTPFactory 获取HTTP工厂单例实例
func GetHTTPFactory() (*HTTPFactory, error) {
	httpFactoryOnce.Do(func() {
		cfg := config.GetConfig()

		if err := config.GetInitError(); err != nil {
			httpFactoryInitErr = fmt.Errorf("failed to load config: %v", err)
			return
		}

		httpConfig := cfg.GetHTTP()

		// 创建共享的resty客户端（线程安全）
		client := resty.New()
		client.SetTimeout(time.Duration(httpConfig.Timeout) * time.Second)
		client.SetTransport(&http.Transport{
			MaxIdleConns:        httpConfig.MaxIdleConns,
			MaxIdleConnsPerHost: httpConfig.MaxIdleConnsPerHost,
			IdleConnTimeout:     time.Duration(httpConfig.IdleConnTimeout) * time.Second,
			MaxConnsPerHost:     httpConfig.MaxConnsPerHost,
			DisableCompression:  httpConfig.DisableCompression,
			DisableKeepAlives:   httpConfig.DisableKeepAlives,
		})

		// 设置默认headers
		client.SetHeaders(map[string]string{
			"Content-Type": "application/json",
			"Accept":       "application/json",
		})

		httpFactoryInstance = &HTTPFactory{
			config: cfg,
			client: client,
		}
	})

	return httpFactoryInstance, httpFactoryInitErr
}

// CreateClient 创建HTTP客户端包装器（共享底层resty.Client）
func (f *HTTPFactory) CreateClient() *HTTPClient {
	return &HTTPClient{
		client: f.client, // 共享同一个线程安全的客户端
	}
}

// GetUnderlyingClient 获取底层resty客户端（用于特殊场景）
func (f *HTTPFactory) GetUnderlyingClient() *resty.Client {
	if f == nil {
		return nil
	}
	return f.client
}

// CreateClient 全局便捷函数：创建HTTP客户端
func CreateClient() (*HTTPClient, error) {
	factory, err := GetHTTPFactory()
	if err != nil {
		return nil, err
	}
	return factory.CreateClient(), nil
}

// GetInitError 获取初始化错误（如果有）
func GetInitError() error {
	return httpFactoryInitErr
}

// ==================== HTTPClient 方法 ====================

// SetAuthToken 设置认证token（请求级别）
func (c *HTTPClient) SetAuthToken(token string) *HTTPClient {
	// 注意：这里设置的是客户端级别的token，会影响所有使用该客户端的请求
	// 对于多用户场景，应该在请求级别设置
	c.client.SetAuthToken(token)
	return c
}

// SetBearerToken 设置Bearer Token认证头（请求级别）
func (c *HTTPClient) SetBearerToken(token string) *HTTPClient {
	if token != "" {
		c.client.SetHeader("Authorization", "Bearer "+token)
	} else {
		c.client.Header.Del("Authorization")
	}
	return c
}

// SetBasicAuth 设置Basic认证头（请求级别）
func (c *HTTPClient) SetBasicAuth(username, password string) *HTTPClient {
	if username != "" && password != "" {
		auth := username + ":" + password
		token := base64.StdEncoding.EncodeToString([]byte(auth))
		c.client.SetHeader("Authorization", "Basic "+token)
	} else {
		c.client.Header.Del("Authorization")
	}
	return c
}

// SetJSONContentType 设置Content-Type为application/json
func (c *HTTPClient) SetJSONContentType() *HTTPClient {
	c.client.SetHeader("Content-Type", "application/json")
	return c
}

// SetHeader 设置请求头
func (c *HTTPClient) SetHeader(key, value string) *HTTPClient {
	c.client.SetHeader(key, value)
	return c
}

// SetHeaders 批量设置请求头
func (c *HTTPClient) SetHeaders(headers map[string]string) *HTTPClient {
	c.client.SetHeaders(headers)
	return c
}

// SetAuthHeaders 设置认证相关的headers
func (c *HTTPClient) SetAuthHeaders(token string) *HTTPClient {
	return c.SetJSONContentType().SetBearerToken(token)
}

// SetBasicAuthHeaders 设置Basic认证相关的headers
func (c *HTTPClient) SetBasicAuthHeaders(username, password string) *HTTPClient {
	return c.SetJSONContentType().SetBasicAuth(username, password)
}

// Post 发送POST请求（在请求级别设置认证信息，避免多用户相互影响）
func (c *HTTPClient) Post(url string, data interface{}) (*resty.Response, error) {
	return c.client.R().SetBody(data).Post(url)
}

// PostWithResult 发送POST请求并解析结果
func (c *HTTPClient) PostWithResult(url string, data interface{}, result interface{}) (*resty.Response, error) {
	return c.client.R().SetBody(data).SetResult(result).Post(url)
}

// PostWithAuth 发送带Bearer Token的POST请求（推荐用于多用户场景）
func (c *HTTPClient) PostWithAuth(url string, data interface{}, token string, result interface{}) (*resty.Response, error) {
	req := c.client.R().SetBody(data)
	if token != "" {
		req.SetHeader("Authorization", "Bearer "+token)
	}
	if result != nil {
		req.SetResult(result)
	}
	return req.Post(url)
}

// Get 发送GET请求
func (c *HTTPClient) Get(url string) (*resty.Response, error) {
	return c.client.R().Get(url)
}

// GetWithResult 发送GET请求并解析结果
func (c *HTTPClient) GetWithResult(url string, result interface{}) (*resty.Response, error) {
	return c.client.R().SetResult(result).Get(url)
}

// GetWithAuth 发送带Bearer Token的GET请求（推荐用于多用户场景）
func (c *HTTPClient) GetWithAuth(url string, token string, result interface{}) (*resty.Response, error) {
	req := c.client.R()
	if token != "" {
		req.SetHeader("Authorization", "Bearer "+token)
	}
	if result != nil {
		req.SetResult(result)
	}
	return req.Get(url)
}

// Put 发送PUT请求
func (c *HTTPClient) Put(url string, data interface{}) (*resty.Response, error) {
	return c.client.R().SetBody(data).Put(url)
}

// PutWithResult 发送PUT请求并解析结果
func (c *HTTPClient) PutWithResult(url string, data interface{}, result interface{}) (*resty.Response, error) {
	return c.client.R().SetBody(data).SetResult(result).Put(url)
}

// Delete 发送DELETE请求
func (c *HTTPClient) Delete(url string) (*resty.Response, error) {
	return c.client.R().Delete(url)
}

// DeleteWithResult 发送DELETE请求并解析结果
func (c *HTTPClient) DeleteWithResult(url string, result interface{}) (*resty.Response, error) {
	return c.client.R().SetResult(result).Delete(url)
}

// ==================== 便捷函数（修正版） ====================

// PostJSON 便捷函数：直接发送POST请求
func PostJSON(url string, data interface{}, result interface{}) (*resty.Response, error) {
	client, err := CreateClient()
	if err != nil {
		return nil, err
	}

	if result != nil {
		return client.PostWithResult(url, data, result)
	}
	return client.Post(url, data)
}

// PostJSONWithBearerToken 便捷函数：使用Bearer Token发送POST请求
func PostJSONWithBearerToken(token, url string, data interface{}, result interface{}) (*resty.Response, error) {
	client, err := CreateClient()
	if err != nil {
		return nil, err
	}

	return client.PostWithAuth(url, data, token, result)
}

// PostJSONWithBasicAuth 便捷函数：使用Basic认证发送POST请求
func PostJSONWithBasicAuth(username, password, url string, data interface{}, result interface{}) (*resty.Response, error) {
	client, err := CreateClient()
	if err != nil {
		return nil, err
	}

	// 为这个特定请求设置Basic Auth
	req := client.client.R().SetBody(data)
	if username != "" && password != "" {
		auth := username + ":" + password
		token := base64.StdEncoding.EncodeToString([]byte(auth))
		req.SetHeader("Authorization", "Basic "+token)
	}
	if result != nil {
		req.SetResult(result)
	}
	return req.Post(url)
}

// GetJSON 便捷函数：直接发送GET请求
func GetJSON(url string, result interface{}) (*resty.Response, error) {
	client, err := CreateClient()
	if err != nil {
		return nil, err
	}

	if result != nil {
		return client.GetWithResult(url, result)
	}
	return client.Get(url)
}

// GetJSONWithBearerToken 便捷函数：使用Bearer Token发送GET请求
func GetJSONWithBearerToken(token, url string, result interface{}) (*resty.Response, error) {
	client, err := CreateClient()
	if err != nil {
		return nil, err
	}

	return client.GetWithAuth(url, token, result)
}

// GetJSONWithBasicAuth 便捷函数：使用Basic认证发送GET请求
func GetJSONWithBasicAuth(username, password, url string, result interface{}) (*resty.Response, error) {
	client, err := CreateClient()
	if err != nil {
		return nil, err
	}

	// 为这个特定请求设置Basic Auth
	req := client.client.R()
	if username != "" && password != "" {
		auth := username + ":" + password
		token := base64.StdEncoding.EncodeToString([]byte(auth))
		req.SetHeader("Authorization", "Basic "+token)
	}
	if result != nil {
		req.SetResult(result)
	}
	return req.Get(url)
}