package report

import (
	"context"
	"encoding/base64"
	"encoding/json"
	"errors"
	"io"
	"log/slog"
	"net/http"
	"proxy-server/client/core"
	"proxy-server/server/pkg/env"
	"strings"
	"time"
)

func Online(ctx context.Context, name string) (id int32, err error) {
	var resp string
	resp, err = repeat(ctx, env.EndpointOnline, map[string]any{
		"name":    name,
		"version": core.Version,
	})
	if err != nil {
		return 0, err
	}

	var body struct {
		Id int32 `json:"id"`
	}
	err = json.Unmarshal([]byte(resp), &body)
	if err != nil {
		return 0, err
	}

	if body.Id == 0 {
		return 0, errors.New("服务注册返回 ID 有误")
	} else {
		return body.Id, nil
	}
}

func Offline(ctx context.Context, name string) (err error) {
	_, err = repeat(ctx, env.EndpointOffline, map[string]any{
		"name":    name,
		"version": core.Version,
	})
	return err
}

func Assigned(ctx context.Context, id int32, edgeId int32, port uint16) (err error) {
	_, err = repeat(ctx, env.EndpointAssigned, map[string]any{
		"proxy": id,
		"edge":  edgeId,
		"port":  port,
	})
	return err
}

func repeat(ctx context.Context, endpoint string, body any) (string, error) {
	bodyStr, err := json.Marshal(body)
	if err != nil {
		panic(err)
	}

	for {
		req, err := http.NewRequest("POST", endpoint, strings.NewReader(string(bodyStr)))
		if err != nil {
			panic(err)
		}

		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "Basic "+base64.RawURLEncoding.EncodeToString([]byte("proxy:proxy")))

		resp, err := http.DefaultClient.Do(req)
		if resp != nil && resp.StatusCode == http.StatusOK {
			var body, err = io.ReadAll(resp.Body)
			if err != nil {
				return "", err
			}
			return string(body), nil
		}
		select {
		case <-ctx.Done():
			return "", ctx.Err()
		default:
		}

		slog.Warn("服务调用失败，五秒后重试", "err", err)
		time.Sleep(5 * time.Second)
	}
}