package facade

import (
	"context"
	"encoding/json"
	"errors"
	"eta/eta_chart_lib/utils"
	"fmt"
	"io"
	"net/http"
	"strings"
	"sync"
	"time"
)

var (
	once          sync.Once
	miniFacadeMap = make(map[string]ChartCollect)

	FacadeClient = BaseMiniFacade{
		client: DefaultClient(),
	}
)

const (
	bookMark   = "bookMark"
	unBookMark = "unBookMark"
)

func GetInstance(name string) ChartCollect {
	return miniFacadeMap[name]
}

type ChartCollect interface {
	Collect(data BaseRequest) (err error)
	UnCollect(data BaseRequest) (err error)
	IsCollect(data BaseRequest) bool
}

type BaseRequest struct {
	Auth       string `json:"auth"`
	UniqueCode string `json:"uniqueCode"`
}

func (bm *BaseMiniFacade) GetData() interface{} {
	return bm.data
}

func (bm *BaseMiniFacade) Post(url string, data interface{}, auth string) (result string, err error) {
	resp, err := bm.client.Post(url, data, auth)
	if err != nil {
		return
	}
	respBody, respErr := io.ReadAll(resp.Body)
	if respErr != nil {
		utils.FileLog.Error("读取body失败，err:%v", err)
		return
	}
	result = string(respBody)
	return
}
func (bm *BaseMiniFacade) Deal(data BaseRequest) *BaseMiniFacade {
	bm.data = data
	return bm
}
func (bm *BaseMiniFacade) HandleAction(action string, handler ChartCollect) (actionMsg string, err error) {
	if handler == nil {
		return "", errors.New("不支持的操作类型")
	}
	switch action {
	case bookMark:
		err = handler.Collect(bm.data)
		actionMsg = "收藏"
	case unBookMark:
		err = handler.UnCollect(bm.data)
		actionMsg = "取消收藏"
	default:
		err = errors.New("不支持的操作")
	}
	return
}

func (bm *BaseMiniFacade) IsCollect(handler ChartCollect) bool {
	return handler.IsCollect(bm.data)
}

type BaseMiniFacade struct {
	client *HttpClient
	data   BaseRequest //返回参数
}

type HttpClient struct {
	*http.Client
	maxRetries     int
	retryDelayFunc RetryDelayFunc
}

// NewClient 构造函数，其中 delayFunc 参数是可选的
func NewClient(timeout time.Duration, maxRetries int, delayFunc ...RetryDelayFunc) *HttpClient {
	var df RetryDelayFunc
	if len(delayFunc) > 0 {
		df = delayFunc[0]
	} else {
		df = defaultRetryDelayFunc
	}
	return &HttpClient{
		Client:         &http.Client{Timeout: timeout},
		maxRetries:     maxRetries,
		retryDelayFunc: df,
	}
}

func DefaultClient() *HttpClient {
	return NewClient(time.Second*10, 3)
}
func defaultRetryDelayFunc(attempt int) time.Duration {
	delay := time.Duration(attempt) * time.Second
	if attempt > 0 {
		delay *= 2
	}
	return delay
}

type RetryDelayFunc func(attempt int) time.Duration

func retryErr(err error) bool {
	return errors.Is(err, context.DeadlineExceeded) || errors.Is(err, context.Canceled)
}

// DoWithRetry 发送带有重试机制的HTTP请求，允许用户自定义重试延迟逻辑
func (hc *HttpClient) DoWithRetry(ctx context.Context, req *http.Request) (resp *http.Response, err error) {
	attempt := 0
	for {
		resp, err = hc.Do(req.WithContext(ctx))
		if err != nil && retryErr(err) {
			if attempt >= hc.maxRetries {

				return nil, fmt.Errorf("请求失败: %w", err)
			}
			attempt++
			delay := hc.retryDelayFunc(attempt)
			time.Sleep(delay)
			continue
		}
		return
	}
}

func (hc *HttpClient) Post(url string, data interface{}, auth string) (resp *http.Response, err error) {
	dataStr, err := json.Marshal(data)
	if err != nil {
		utils.FileLog.Error("请求data json序列化失败，err:" + err.Error())
	}
	body := io.NopCloser(strings.NewReader(string(dataStr)))
	req, err := http.NewRequest(http.MethodPost, url, body)
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", auth)
	if err != nil {
		utils.FileLog.Error("创建POST请求失败: %v", err.Error())
	}
	resp, err = hc.DoWithRetry(req.Context(), req)
	if err == nil {
		code := resp.StatusCode
		if code != 200 {
			utils.FileLog.Error("请求错误应答，状态码：%d", code)
			errMsg := fmt.Sprintf("请求状态码异常,StatusCode:[%d]", code)
			respBody, respErr := io.ReadAll(resp.Body)
			if respErr != nil {
				utils.FileLog.Error("读取body失败，err:%v", err)
				err = errors.New(errMsg)
				return
			}
			utils.FileLog.Error("请求错误应答，body:%s", string(respBody))
			errMsg = fmt.Sprintf("%s,body:%s", errMsg, string(respBody))
			err = errors.New(errMsg)
			return
		}
	} else {
		utils.FileLog.Error("未知的应答错误,获取第三方授权信息失败", err.Error())
	}
	return
}
func (hc *HttpClient) PostWithAuth(url string, data interface{}, token string) (resp *http.Response, err error) {
	dataStr, err := json.Marshal(data)
	if err != nil {
		utils.FileLog.Error("请求data json序列化失败，err:" + err.Error())
	}
	body := io.NopCloser(strings.NewReader(string(dataStr)))
	req, err := http.NewRequest(http.MethodPost, url, body)
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", token)
	if err != nil {
		utils.FileLog.Error("创建POST请求失败: %v", err)
	}
	resp, err = hc.DoWithRetry(req.Context(), req)
	code := resp.StatusCode
	if code != 200 {
		utils.FileLog.Error("请求错误应答，状态码：%d", code)
		errMsg := fmt.Sprintf("请求状态码异常,StatusCode:[%d]", code)
		respBody, respErr := io.ReadAll(resp.Body)
		if respErr != nil {
			utils.FileLog.Error("读取body失败，err:%v", err)
			err = errors.New(errMsg)
			return
		}
		utils.FileLog.Error("请求错误应答，body:%s", string(respBody))
		errMsg = fmt.Sprintf("%s,body:%s", errMsg, string(respBody))
		err = errors.New(errMsg)
		return
	}
	return
}
func (hc *HttpClient) Get(url string) (resp *http.Response, err error) {
	req, err := http.NewRequestWithContext(context.Background(), http.MethodGet, url, nil)
	if err != nil {
		utils.FileLog.Error("创建请求失败: %v", err)
	}
	resp, err = hc.DoWithRetry(req.Context(), req)
	return
}

func RegisterMiniFacade(name string, facade ChartCollect) {
	if facade == nil {
		panic("实例不存在,无法注册")
	}
	if _, ok := miniFacadeMap[name]; ok {
		utils.FileLog.Error("请勿重复注册小程序插件:" + name)
	}
	miniFacadeMap[name] = facade
}

func init() {

}