lingniu-vehicle-ingest/vehicle-data-platform/apps/api/internal/app/server.go

package app

import (
	"bytes"
	"container/list"
	"context"
	"database/sql"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"math"
	"net/http"
	"net/url"
	"os"
	"strconv"
	"strings"
	"sync"
	"time"

	"lingniu/vehicle-data-platform/apps/api/internal/config"
	"lingniu/vehicle-data-platform/apps/api/internal/httpx"
	"lingniu/vehicle-data-platform/apps/api/internal/openplatform"
	"lingniu/vehicle-data-platform/apps/api/internal/platform"
	"lingniu/vehicle-data-platform/apps/api/internal/static"
)

func NewServer(cfg config.Config) http.Handler {
	dataMode := strings.ToLower(strings.TrimSpace(cfg.DataMode))
	if dataMode == "" {
		dataMode = "mock"
	}
	var store platform.Store = platform.NewMockStore()
	var authDB *sql.DB
	var storeErr error
	if dataMode != "mock" && dataMode != "production" {
		storeErr = fmt.Errorf("DATA_MODE must be mock or production")
	}
	if dataMode == "production" && strings.TrimSpace(cfg.MySQLDSN) == "" {
		storeErr = fmt.Errorf("production data mode requires MYSQL_DSN")
	}
	if cfg.MySQLDSN != "" && dataMode == "production" {
		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()
		db, err := platform.OpenSQL(ctx, "mysql", cfg.MySQLDSN)
		if err != nil {
			log.Printf("production mysql store disabled: %v", err)
			if dataMode == "production" {
				storeErr = fmt.Errorf("connect production mysql: %w", err)
			}
		} else {
			authDB = db
			var tdengine *sql.DB
			if cfg.TDengineDSN != "" {
				tdengine, err = platform.OpenSQL(ctx, cfg.TDengineDriver, cfg.TDengineDSN)
				if err != nil {
					log.Printf("production tdengine store disabled: %v", err)
				} else {
					log.Printf("production tdengine store enabled")
				}
			}
			productionStore := platform.NewProductionStore(db, tdengine, cfg.TDengineDatabase)
			if cfg.RedisAddr != "" {
				productionStore.WithRedisOnlineKeyCounter(platform.NewRedisOnlineKeyCounter(cfg.RedisAddr, cfg.RedisUsername, cfg.RedisPassword, cfg.RedisDB))
				log.Printf("production redis health probe enabled")
			}
			if cfg.CapacityCheckBin != "" {
				productionStore.WithCapacityChecker(platform.NewCapacityCheckCommand(cfg.CapacityCheckBin))
				log.Printf("production capacity-check probe enabled")
			}
			productionStore.WithAlertStreamConfig(cfg.AlertStreamMode, cfg.AlertStreamKafkaGroup)
			store = productionStore
			storeErr = nil
			log.Printf("production mysql store enabled")
		}
	}
	host, _ := os.Hostname()
	workerHost := strings.TrimSpace(host)
	if workerHost == "" {
		workerHost = "api"
	}
	platformService := platform.NewServiceWithRuntime(store, platform.RuntimeInfo{
		DataMode:                 dataMode,
		ExportDir:                strings.TrimSpace(cfg.ExportDir),
		RequestTimeoutMs:         int(cfg.RequestTimeout / time.Millisecond),
		AMapWebJSConfigured:      strings.TrimSpace(cfg.AMapWebJSKey) != "",
		AMapAPIConfigured:        strings.TrimSpace(cfg.AMapAPIKey) != "",
		AMapSecurityProxyEnabled: strings.TrimSpace(cfg.AMapSecurityCode) != "" && strings.TrimSpace(cfg.AMapServiceHost) != "",
		AMapSecurityCodeExposed:  exposedAMapSecurityCode(cfg) != "",
		AMapSecurityServiceHost:  strings.TrimSpace(cfg.AMapServiceHost),
		PlatformRelease:          strings.TrimSpace(cfg.PlatformRelease),
		AlertStreamMode:          strings.TrimSpace(cfg.AlertStreamMode),
		AlertStreamConsumerGroup: strings.TrimSpace(cfg.AlertStreamKafkaGroup),
		AlertNotificationConfig:  alertNotificationConfig(cfg, dataMode),
		HistoryCleanupAutomation: cfg.HistoryCleanupAutomation,
		HistoryCleanupPoll:       cfg.HistoryCleanupPollInterval,
		HistoryCleanupLease:      cfg.HistoryCleanupLease,
		HistoryCleanupWorkerID:   "cleanup-scheduler-" + workerHost,
	})
	platformService.StartHistoryExportCleanupAutomation(context.Background())
	var api http.Handler = platform.NewHandler(platformService)
	if storeErr != nil {
		log.Printf("platform data store unavailable: %v", storeErr)
		api = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			httpx.WriteError(w, http.StatusServiceUnavailable, "DATA_STORE_UNAVAILABLE", "生产数据源不可用", storeErr.Error(), requestTraceID(r))
		})
	}
	if authDB != nil && storeErr == nil {
		openPlatformHandler := openplatform.NewAdminHandler(
			openplatform.NewService(openplatform.NewMySQLRepository(authDB)),
			openplatform.NewPortalService(authDB, cfg.SessionTTL),
		)
		internalMux := http.NewServeMux()
		internalMux.Handle("/api/v2/open-platform/", openPlatformHandler)
		internalMux.Handle("/", api)
		api = internalMux
	}
	// Reverse geocoding consumes the server-side AMap credential, so it must
	// stay behind the same authentication boundary as the platform API.
	api = withAMapReverseGeocodeAPI(api, cfg, "https://restapi.amap.com", http.DefaultClient)
	handler := static.Handler(cfg.StaticDir, withAPIAuth(api, cfg, authDB))
	handler = withAppConfig(handler, cfg)
	handler = withAMapSecurityProxy(handler, cfg, defaultAMapProxyUpstreams(), http.DefaultClient)
	return withRequestTimeout(handler, cfg.RequestTimeout)
}

func alertNotificationConfig(cfg config.Config, dataMode string) platform.AlertNotificationConfig {
	channels := []platform.AlertNotificationChannelCapability{
		{Channel: "in_app", Label: "站内信", Configured: true},
		{Channel: "sms", Label: "短信", Configured: dataMode == "mock" || strings.TrimSpace(cfg.AlertNotificationSMSURL) != "" && strings.TrimSpace(cfg.AlertNotificationSMSSecret) != ""},
		{Channel: "email", Label: "邮件", Configured: dataMode == "mock" || strings.TrimSpace(cfg.AlertNotificationEmailURL) != "" && strings.TrimSpace(cfg.AlertNotificationEmailSecret) != ""},
		{Channel: "wecom", Label: "企业通讯", Configured: dataMode == "mock" || strings.TrimSpace(cfg.AlertNotificationWeComURL) != "" && strings.TrimSpace(cfg.AlertNotificationWeComSecret) != ""},
	}
	targets := []platform.AlertNotificationTargetOption{{ID: "platform-operators", Label: "平台值班组", Channels: []string{"in_app"}}}
	raw := strings.TrimSpace(cfg.AlertNotificationTargetsJSON)
	if raw == "" && dataMode == "mock" {
		targets = []platform.AlertNotificationTargetOption{
			{ID: "platform-operators", Label: "平台值班组", Channels: []string{"in_app", "email", "wecom"}},
			{ID: "night-shift", Label: "夜班负责人", Channels: []string{"in_app", "sms", "wecom"}},
			{ID: "data-platform", Label: "数据平台负责人", Channels: []string{"in_app", "email", "wecom"}},
		}
	} else if raw != "" {
		var configured []platform.AlertNotificationTargetOption
		if err := json.Unmarshal([]byte(raw), &configured); err != nil {
			log.Printf("alert notification target catalog ignored: %v", err)
		} else {
			targets = configured
		}
	}
	return platform.NormalizeAlertNotificationConfig(platform.AlertNotificationConfig{Targets: targets, Channels: channels})
}

func withAppConfig(next http.Handler, cfg config.Config) http.Handler {
	type appConfig struct {
		AMapWebJSKey     string `json:"amapWebJsKey,omitempty"`
		AMapSecurityCode string `json:"amapSecurityJsCode,omitempty"`
		AMapServiceHost  string `json:"amapSecurityServiceHost,omitempty"`
	}
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/app-config.js" {
			next.ServeHTTP(w, r)
			return
		}
		w.Header().Set("Content-Type", "application/javascript; charset=utf-8")
		w.Header().Set("Cache-Control", "no-store")
		body, err := json.Marshal(appConfig{
			AMapWebJSKey:     cfg.AMapWebJSKey,
			AMapSecurityCode: exposedAMapSecurityCode(cfg),
			AMapServiceHost:  cfg.AMapServiceHost,
		})
		if err != nil {
			http.Error(w, "failed to render app config", http.StatusInternalServerError)
			return
		}
		_, _ = fmt.Fprintf(w, "window.__LINGNIU_APP_CONFIG__=%s;\n", body)
	})
}

func exposedAMapSecurityCode(cfg config.Config) string {
	if cfg.AMapServiceHost != "" {
		return ""
	}
	return cfg.AMapSecurityCode
}

type amapProxyUpstreams struct {
	RestAPI string
	WebAPI  string
	FMap    string
}

func defaultAMapProxyUpstreams() amapProxyUpstreams {
	return amapProxyUpstreams{
		RestAPI: "https://restapi.amap.com",
		WebAPI:  "https://webapi.amap.com",
		FMap:    "https://fmap01.amap.com",
	}
}

func (upstreams amapProxyUpstreams) normalized() amapProxyUpstreams {
	defaults := defaultAMapProxyUpstreams()
	if upstreams.RestAPI == "" {
		upstreams.RestAPI = defaults.RestAPI
	}
	if upstreams.WebAPI == "" {
		upstreams.WebAPI = defaults.WebAPI
	}
	if upstreams.FMap == "" {
		upstreams.FMap = defaults.FMap
	}
	upstreams.RestAPI = strings.TrimRight(upstreams.RestAPI, "/")
	upstreams.WebAPI = strings.TrimRight(upstreams.WebAPI, "/")
	upstreams.FMap = strings.TrimRight(upstreams.FMap, "/")
	return upstreams
}

func withAMapSecurityProxy(next http.Handler, cfg config.Config, upstreams amapProxyUpstreams, client *http.Client) http.Handler {
	serviceHost := strings.TrimRight(cfg.AMapServiceHost, "/")
	securityCode := strings.TrimSpace(cfg.AMapSecurityCode)
	if serviceHost == "" || securityCode == "" {
		return next
	}
	if client == nil {
		client = http.DefaultClient
	}
	upstreams = upstreams.normalized()
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != serviceHost && !strings.HasPrefix(r.URL.Path, serviceHost+"/") {
			next.ServeHTTP(w, r)
			return
		}
		target, err := amapProxyURL(upstreams, serviceHost, securityCode, r)
		if err != nil {
			httpx.WriteError(w, http.StatusBadGateway, "AMAP_PROXY_URL_INVALID", "高德地图代理地址无效", err.Error(), requestTraceID(r))
			return
		}
		req, err := http.NewRequestWithContext(r.Context(), r.Method, target, r.Body)
		if err != nil {
			httpx.WriteError(w, http.StatusBadGateway, "AMAP_PROXY_REQUEST_INVALID", "高德地图代理请求无效", err.Error(), requestTraceID(r))
			return
		}
		req.Header = r.Header.Clone()
		req.Host = ""
		resp, err := client.Do(req)
		if err != nil {
			httpx.WriteError(w, http.StatusBadGateway, "AMAP_PROXY_FAILED", "高德地图代理请求失败", err.Error(), requestTraceID(r))
			return
		}
		defer resp.Body.Close()
		for key, values := range resp.Header {
			for _, value := range values {
				w.Header().Add(key, value)
			}
		}
		w.WriteHeader(resp.StatusCode)
		_, _ = io.Copy(w, resp.Body)
	})
}

func amapProxyURL(upstreams amapProxyUpstreams, serviceHost string, securityCode string, r *http.Request) (string, error) {
	targetPath := strings.TrimPrefix(r.URL.Path, serviceHost)
	if targetPath == "" {
		targetPath = "/"
	}
	upstreamBase := upstreams.RestAPI
	if strings.HasPrefix(targetPath, "/v4/map/styles") {
		upstreamBase = upstreams.WebAPI
	} else if strings.HasPrefix(targetPath, "/v3/vectormap") {
		upstreamBase = upstreams.FMap
	}
	base, err := url.Parse(upstreamBase)
	if err != nil {
		return "", err
	}
	base.Path = strings.TrimRight(base.Path, "/") + targetPath
	query := r.URL.Query()
	query.Set("jscode", securityCode)
	base.RawQuery = query.Encode()
	return base.String(), nil
}

type mapReverseGeocodeResponse struct {
	Provider         string  `json:"provider"`
	Longitude        float64 `json:"longitude"`
	Latitude         float64 `json:"latitude"`
	FormattedAddress string  `json:"formattedAddress"`
	Province         string  `json:"province,omitempty"`
	City             string  `json:"city,omitempty"`
	District         string  `json:"district,omitempty"`
	Township         string  `json:"township,omitempty"`
	Adcode           string  `json:"adcode,omitempty"`
}

const (
	reverseGeocodeCacheTTL        = time.Hour
	reverseGeocodeCacheMaxEntries = 4096
)

type reverseGeocodeCacheEntry struct {
	key       string
	value     mapReverseGeocodeResponse
	expiresAt time.Time
}

type reverseGeocodeKeyLock struct {
	mu   sync.Mutex
	refs int
}

type reverseGeocodeCache struct {
	mu         sync.Mutex
	entries    map[string]*list.Element
	recency    *list.List
	keyLocks   map[string]*reverseGeocodeKeyLock
	maxEntries int
	ttl        time.Duration
	now        func() time.Time
}

func newReverseGeocodeCache(maxEntries int, ttl time.Duration) *reverseGeocodeCache {
	return &reverseGeocodeCache{
		entries:    make(map[string]*list.Element),
		recency:    list.New(),
		keyLocks:   make(map[string]*reverseGeocodeKeyLock),
		maxEntries: maxEntries,
		ttl:        ttl,
		now:        time.Now,
	}
}

func reverseGeocodeCacheKey(longitude, latitude float64) string {
	return fmt.Sprintf("%.5f,%.5f", longitude, latitude)
}

func (cache *reverseGeocodeCache) get(key string) (mapReverseGeocodeResponse, bool) {
	cache.mu.Lock()
	defer cache.mu.Unlock()
	element, ok := cache.entries[key]
	if !ok {
		return mapReverseGeocodeResponse{}, false
	}
	entry := element.Value.(*reverseGeocodeCacheEntry)
	if !entry.expiresAt.After(cache.now()) {
		cache.remove(element)
		return mapReverseGeocodeResponse{}, false
	}
	cache.recency.MoveToFront(element)
	return entry.value, true
}

func (cache *reverseGeocodeCache) put(key string, value mapReverseGeocodeResponse) {
	if cache.maxEntries <= 0 || cache.ttl <= 0 {
		return
	}
	cache.mu.Lock()
	defer cache.mu.Unlock()
	if element, ok := cache.entries[key]; ok {
		entry := element.Value.(*reverseGeocodeCacheEntry)
		entry.value = value
		entry.expiresAt = cache.now().Add(cache.ttl)
		cache.recency.MoveToFront(element)
		return
	}
	for len(cache.entries) >= cache.maxEntries {
		cache.remove(cache.recency.Back())
	}
	entry := &reverseGeocodeCacheEntry{key: key, value: value, expiresAt: cache.now().Add(cache.ttl)}
	cache.entries[key] = cache.recency.PushFront(entry)
}

func (cache *reverseGeocodeCache) remove(element *list.Element) {
	if element == nil {
		return
	}
	delete(cache.entries, element.Value.(*reverseGeocodeCacheEntry).key)
	cache.recency.Remove(element)
}

func (cache *reverseGeocodeCache) lockKey(key string) func() {
	cache.mu.Lock()
	keyLock := cache.keyLocks[key]
	if keyLock == nil {
		keyLock = &reverseGeocodeKeyLock{}
		cache.keyLocks[key] = keyLock
	}
	keyLock.refs++
	cache.mu.Unlock()
	keyLock.mu.Lock()
	return func() {
		keyLock.mu.Unlock()
		cache.mu.Lock()
		keyLock.refs--
		if keyLock.refs == 0 {
			delete(cache.keyLocks, key)
		}
		cache.mu.Unlock()
	}
}

func withAMapReverseGeocodeAPI(next http.Handler, cfg config.Config, upstream string, client *http.Client) http.Handler {
	apiKey := strings.TrimSpace(cfg.AMapAPIKey)
	if client == nil {
		client = http.DefaultClient
	}
	upstream = strings.TrimRight(upstream, "/")
	if upstream == "" {
		upstream = "https://restapi.amap.com"
	}
	cache := newReverseGeocodeCache(reverseGeocodeCacheMaxEntries, reverseGeocodeCacheTTL)
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/api/map/reverse-geocode" {
			next.ServeHTTP(w, r)
			return
		}
		if r.Method != http.MethodGet {
			httpx.WriteError(w, http.StatusMethodNotAllowed, "METHOD_NOT_ALLOWED", "请求方法不支持", "", requestTraceID(r))
			return
		}
		if apiKey == "" {
			httpx.WriteError(w, http.StatusServiceUnavailable, "AMAP_API_UNCONFIGURED", "高德服务端 API 未配置", "请配置 AMAP_API_KEY 后再解析地址", requestTraceID(r))
			return
		}
		longitude, latitude, err := parseReverseGeocodeCoordinate(r.URL.Query())
		if err != nil {
			httpx.WriteError(w, http.StatusBadRequest, "BAD_COORDINATE", "经纬度参数无效", err.Error(), requestTraceID(r))
			return
		}
		cacheKey := reverseGeocodeCacheKey(longitude, latitude)
		unlock := cache.lockKey(cacheKey)
		defer unlock()
		if cached, ok := cache.get(cacheKey); ok {
			cached.Longitude = longitude
			cached.Latitude = latitude
			w.Header().Set("X-Reverse-Geocode-Cache", "HIT")
			httpx.WriteOK(w, requestTraceID(r), cached)
			return
		}
		w.Header().Set("X-Reverse-Geocode-Cache", "MISS")
		target, err := url.Parse(upstream + "/v3/geocode/regeo")
		if err != nil {
			httpx.WriteError(w, http.StatusBadGateway, "AMAP_REVERSE_GEOCODE_URL_INVALID", "高德逆地理编码地址无效", err.Error(), requestTraceID(r))
			return
		}
		query := target.Query()
		query.Set("key", apiKey)
		mapLongitude, mapLatitude := wgs84ToGCJ02(longitude, latitude)
		query.Set("location", fmt.Sprintf("%.6f,%.6f", mapLongitude, mapLatitude))
		query.Set("extensions", "base")
		query.Set("radius", "1000")
		query.Set("output", "JSON")
		target.RawQuery = query.Encode()
		req, err := http.NewRequestWithContext(r.Context(), http.MethodGet, target.String(), nil)
		if err != nil {
			httpx.WriteError(w, http.StatusBadGateway, "AMAP_REVERSE_GEOCODE_REQUEST_INVALID", "高德逆地理编码请求无效", err.Error(), requestTraceID(r))
			return
		}
		resp, err := client.Do(req)
		if err != nil {
			httpx.WriteError(w, http.StatusBadGateway, "AMAP_REVERSE_GEOCODE_FAILED", "高德逆地理编码请求失败", err.Error(), requestTraceID(r))
			return
		}
		defer resp.Body.Close()
		if resp.StatusCode < 200 || resp.StatusCode >= 300 {
			httpx.WriteError(w, http.StatusBadGateway, "AMAP_REVERSE_GEOCODE_BAD_STATUS", "高德逆地理编码返回异常", resp.Status, requestTraceID(r))
			return
		}
		var body struct {
			Status    string `json:"status"`
			Info      string `json:"info"`
			Infocode  string `json:"infocode"`
			Regeocode struct {
				FormattedAddress string `json:"formatted_address"`
				AddressComponent struct {
					Province json.RawMessage `json:"province"`
					City     json.RawMessage `json:"city"`
					District json.RawMessage `json:"district"`
					Township json.RawMessage `json:"township"`
					Adcode   json.RawMessage `json:"adcode"`
				} `json:"addressComponent"`
			} `json:"regeocode"`
		}
		if err := json.NewDecoder(resp.Body).Decode(&body); err != nil {
			httpx.WriteError(w, http.StatusBadGateway, "AMAP_REVERSE_GEOCODE_BAD_JSON", "高德逆地理编码响应解析失败", err.Error(), requestTraceID(r))
			return
		}
		if body.Status != "1" {
			detail := strings.TrimSpace(body.Info)
			if body.Infocode != "" {
				detail = strings.TrimSpace(detail + " " + body.Infocode)
			}
			httpx.WriteError(w, http.StatusBadGateway, "AMAP_REVERSE_GEOCODE_REJECTED", "高德逆地理编码未成功", detail, requestTraceID(r))
			return
		}
		result := mapReverseGeocodeResponse{
			Provider:         "AMap",
			Longitude:        longitude,
			Latitude:         latitude,
			FormattedAddress: body.Regeocode.FormattedAddress,
			Province:         amapJSONText(body.Regeocode.AddressComponent.Province),
			City:             amapJSONText(body.Regeocode.AddressComponent.City),
			District:         amapJSONText(body.Regeocode.AddressComponent.District),
			Township:         amapJSONText(body.Regeocode.AddressComponent.Township),
			Adcode:           amapJSONText(body.Regeocode.AddressComponent.Adcode),
		}
		cache.put(cacheKey, result)
		httpx.WriteOK(w, requestTraceID(r), result)
	})
}

func parseReverseGeocodeCoordinate(query url.Values) (float64, float64, error) {
	longitude, err := strconv.ParseFloat(strings.TrimSpace(firstNonEmpty(query.Get("longitude"), query.Get("lng"))), 64)
	if err != nil {
		return 0, 0, fmt.Errorf("longitude 必须是数字")
	}
	latitude, err := strconv.ParseFloat(strings.TrimSpace(firstNonEmpty(query.Get("latitude"), query.Get("lat"))), 64)
	if err != nil {
		return 0, 0, fmt.Errorf("latitude 必须是数字")
	}
	if !isCoordinate(longitude, -180, 180) || !isCoordinate(latitude, -90, 90) || (longitude == 0 && latitude == 0) {
		return 0, 0, fmt.Errorf("longitude/latitude 超出范围或为空坐标")
	}
	return longitude, latitude, nil
}

func wgs84ToGCJ02(longitude float64, latitude float64) (float64, float64) {
	if longitude < 72.004 || longitude > 137.8347 || latitude < 0.8293 || latitude > 55.8271 {
		return longitude, latitude
	}
	const semiMajorAxis = 6378245.0
	const eccentricitySquared = 0.006693421622965943
	longitudeOffset := transformGCJLongitude(longitude-105, latitude-35)
	latitudeOffset := transformGCJLatitude(longitude-105, latitude-35)
	radianLatitude := latitude / 180 * math.Pi
	magic := 1 - eccentricitySquared*math.Pow(math.Sin(radianLatitude), 2)
	squareRootMagic := math.Sqrt(magic)
	convertedLatitude := latitude + latitudeOffset*180/((semiMajorAxis*(1-eccentricitySquared))/(magic*squareRootMagic)*math.Pi)
	convertedLongitude := longitude + longitudeOffset*180/(semiMajorAxis/squareRootMagic*math.Cos(radianLatitude)*math.Pi)
	return convertedLongitude, convertedLatitude
}

func transformGCJLatitude(longitude float64, latitude float64) float64 {
	value := -100 + 2*longitude + 3*latitude + 0.2*latitude*latitude + 0.1*longitude*latitude + 0.2*math.Sqrt(math.Abs(longitude))
	value += (20*math.Sin(6*longitude*math.Pi) + 20*math.Sin(2*longitude*math.Pi)) * 2 / 3
	value += (20*math.Sin(latitude*math.Pi) + 40*math.Sin(latitude/3*math.Pi)) * 2 / 3
	value += (160*math.Sin(latitude/12*math.Pi) + 320*math.Sin(latitude*math.Pi/30)) * 2 / 3
	return value
}

func transformGCJLongitude(longitude float64, latitude float64) float64 {
	value := 300 + longitude + 2*latitude + 0.1*longitude*longitude + 0.1*longitude*latitude + 0.1*math.Sqrt(math.Abs(longitude))
	value += (20*math.Sin(6*longitude*math.Pi) + 20*math.Sin(2*longitude*math.Pi)) * 2 / 3
	value += (20*math.Sin(longitude*math.Pi) + 40*math.Sin(longitude/3*math.Pi)) * 2 / 3
	value += (150*math.Sin(longitude/12*math.Pi) + 300*math.Sin(longitude/30*math.Pi)) * 2 / 3
	return value
}

func isCoordinate(value float64, min float64, max float64) bool {
	return !math.IsNaN(value) && !math.IsInf(value, 0) && value >= min && value <= max
}

func amapJSONText(value json.RawMessage) string {
	if len(value) == 0 || string(value) == "null" {
		return ""
	}
	var text string
	if err := json.Unmarshal(value, &text); err == nil {
		return text
	}
	var texts []string
	if err := json.Unmarshal(value, &texts); err == nil {
		return strings.Join(texts, "")
	}
	return ""
}

func firstNonEmpty(values ...string) string {
	for _, value := range values {
		if strings.TrimSpace(value) != "" {
			return value
		}
	}
	return ""
}

func withRequestTimeout(next http.Handler, timeout time.Duration) http.Handler {
	if timeout <= 0 {
		return next
	}
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		ctx, cancel := context.WithTimeout(r.Context(), timeout)
		defer cancel()
		buffered := newBufferedResponseWriter()
		result := make(chan any, 1)
		go func() {
			defer func() {
				result <- recover()
			}()
			next.ServeHTTP(buffered, r.WithContext(ctx))
		}()
		select {
		case panicValue := <-result:
			if panicValue != nil {
				panic(panicValue)
			}
			buffered.writeTo(w)
		case <-ctx.Done():
			httpx.WriteError(w, http.StatusServiceUnavailable, "REQUEST_TIMEOUT", "请求处理超时", "", requestTraceID(r))
		}
	})
}

func requestTraceID(r *http.Request) string {
	if value := r.Header.Get("X-Trace-Id"); value != "" {
		return value
	}
	return "trace-" + time.Now().Format("20060102150405.000000")
}

type bufferedResponseWriter struct {
	mu     sync.Mutex
	header http.Header
	status int
	body   bytes.Buffer
}

func newBufferedResponseWriter() *bufferedResponseWriter {
	return &bufferedResponseWriter{header: http.Header{}, status: http.StatusOK}
}

func (w *bufferedResponseWriter) Header() http.Header {
	return w.header
}

func (w *bufferedResponseWriter) WriteHeader(statusCode int) {
	w.mu.Lock()
	defer w.mu.Unlock()
	w.status = statusCode
}

func (w *bufferedResponseWriter) Write(body []byte) (int, error) {
	w.mu.Lock()
	defer w.mu.Unlock()
	return w.body.Write(body)
}

func (w *bufferedResponseWriter) writeTo(target http.ResponseWriter) {
	w.mu.Lock()
	defer w.mu.Unlock()
	for key, values := range w.header {
		for _, value := range values {
			target.Header().Add(key, value)
		}
	}
	target.WriteHeader(w.status)
	_, _ = target.Write(w.body.Bytes())
}