package platform

import (
	"context"
	"errors"
	"math"
	"net/url"
	"sort"
	"strconv"
	"strings"
	"time"
)

type Store interface {
	DashboardSummary(context.Context) (DashboardSummary, error)
	Vehicles(context.Context, url.Values) (Page[VehicleRow], error)
	VehicleCoverage(context.Context, url.Values) (Page[VehicleCoverageRow], error)
	VehicleCoverageSummary(context.Context, url.Values) (VehicleCoverageSummary, error)
	VehicleServiceSummary(context.Context) (VehicleServiceSummary, error)
	VehicleRealtime(context.Context, url.Values) (Page[VehicleRealtimeRow], error)
	RealtimeLocations(context.Context, url.Values) (Page[RealtimeLocationRow], error)
	HistoryLocations(context.Context, url.Values) (Page[HistoryLocationRow], error)
	HistoryLocationsFromTDengine(context.Context, url.Values) (Page[HistoryLocationRow], error)
	RawFrames(context.Context, RawFrameQuery) (Page[RawFrameRow], error)
	MileageSummary(context.Context, url.Values) (MileageSummary, error)
	DailyMileage(context.Context, url.Values) (Page[DailyMileageRow], error)
	QualitySummary(context.Context, url.Values) (QualitySummary, error)
	QualityIssues(context.Context, url.Values) (Page[QualityIssueRow], error)
	OpsHealth(context.Context) (OpsHealth, error)
}

type VehicleOverviewBatchStore interface {
	VehicleServiceOverviews(context.Context, VehicleOverviewBatchQuery) (Page[VehicleServiceOverview], error)
}

type RawFrameQuery struct {
	Protocol      string   `json:"protocol"`
	VIN           string   `json:"vin"`
	Keyword       string   `json:"keyword"`
	DateFrom      string   `json:"dateFrom"`
	DateTo        string   `json:"dateTo"`
	Fields        []string `json:"fields"`
	IncludeFields bool     `json:"includeFields"`
	Limit         int      `json:"limit"`
	Offset        int      `json:"offset"`
}

type VehicleOverviewBatchQuery struct {
	Keywords []string `json:"keywords"`
	Protocol string   `json:"protocol"`
	Limit    int      `json:"limit"`
	Offset   int      `json:"offset"`
}

type Service struct {
	store   Store
	runtime RuntimeInfo
}

type clientError struct {
	Code    string
	Message string
}

func (e clientError) Error() string {
	return e.Message
}

func asClientError(err error) (clientError, bool) {
	var target clientError
	if errors.As(err, &target) {
		return target, true
	}
	return clientError{}, false
}

var canonicalVehicleProtocols = []string{"GB32960", "JT808", "YUTONG_MQTT"}

var qualityAlertRuleTemplates = []QualityAlertRule{
	{
		IssueType: "NO_SOURCE",
		Title:     "无数据来源",
		Level:     "P0",
		Owner:     "平台接入",
		Trigger:   "绑定车辆连续无 GB32960、JT808、MQTT 来源证据",
		Notify:    "立即通知接入运维，30 分钟未恢复升级给业务责任人",
		SLA:       "30 分钟确认",
	},
	{
		IssueType: "VIN_MISSING",
		Title:     "VIN 缺失",
		Level:     "P0",
		Owner:     "车辆档案",
		Trigger:   "来源有数据但无法归并到 VIN",
		Notify:    "通知档案维护人补齐车牌、手机号和 VIN 映射",
		SLA:       "2 小时修复",
	},
	{
		IssueType: "LINK_GAP",
		Title:     "链路中断",
		Level:     "P1",
		Owner:     "链路运维",
		Trigger:   "车辆或平台来源上报间断、Redis 在线状态过期",
		Notify:    "通知平台转发和网关值班人，持续异常进入日报",
		SLA:       "1 小时恢复",
	},
	{
		IssueType: "FIELD_MISSING",
		Title:     "字段缺失",
		Level:     "P1",
		Owner:     "协议解析",
		Trigger:   "核心字段缺失导致定位、里程或统计不可用",
		Notify:    "通知解析负责人核对字段映射和 RAW 样本",
		SLA:       "当日闭环",
	},
}

var qualityNotificationPolicies = []QualityNotificationPolicy{
	{
		Name:               "P0 实时中断",
		Target:             "接入运维 + 业务责任人",
		Channel:            "站内告警 / 邮件 / 企业微信",
		Condition:          "无来源、VIN 缺失、存储不可写",
		EscalationMinutes:  30,
		AcceptanceCriteria: "来源恢复并持续 10 分钟，车辆服务可查到实时与历史证据",
	},
	{
		Name:               "P1 数据质量",
		Target:             "协议解析 + 数据治理",
		Channel:            "站内告警 / 每日汇总邮件",
		Condition:          "字段缺失、链路间断、容量风险",
		EscalationMinutes:  120,
		AcceptanceCriteria: "核心字段恢复解析，影响车辆可通过 RAW 与历史证据复核",
	},
	{
		Name:               "P2 趋势关注",
		Target:             "数智中心",
		Channel:            "周报 / 趋势看板",
		Condition:          "单源车辆、档案缺项、来源覆盖下降",
		EscalationMinutes:  1440,
		AcceptanceCriteria: "趋势原因已归档，责任人和后续治理动作明确",
	},
}

var qualityIssuePriorityWeight = map[string]int{
	"NO_SOURCE":     10,
	"VIN_MISSING":   9,
	"LINK_GAP":      8,
	"FIELD_MISSING": 7,
}

func completeProtocolStats(stats []ProtocolStat) []ProtocolStat {
	byProtocol := make(map[string]ProtocolStat, len(stats)+len(canonicalVehicleProtocols))
	for _, stat := range stats {
		protocol := strings.TrimSpace(stat.Protocol)
		if protocol == "" {
			continue
		}
		stat.Protocol = protocol
		byProtocol[protocol] = stat
	}
	out := make([]ProtocolStat, 0, len(byProtocol)+len(canonicalVehicleProtocols))
	seen := map[string]struct{}{}
	for _, protocol := range canonicalVehicleProtocols {
		stat := byProtocol[protocol]
		stat.Protocol = protocol
		out = append(out, stat)
		seen[protocol] = struct{}{}
	}
	extra := make([]string, 0)
	for protocol := range byProtocol {
		if _, ok := seen[protocol]; !ok {
			extra = append(extra, protocol)
		}
	}
	sort.Strings(extra)
	for _, protocol := range extra {
		out = append(out, byProtocol[protocol])
	}
	return out
}

func missingCanonicalProtocols(protocols []string) []string {
	missing := make([]string, 0, len(canonicalVehicleProtocols))
	for _, protocol := range canonicalVehicleProtocols {
		if !containsString(protocols, protocol) {
			missing = append(missing, protocol)
		}
	}
	return missing
}

func buildVehicleCoverageSourceStatus(protocols []string, onlineProtocols []string, lastSeen string) []VehicleSourceStatus {
	statuses := make([]VehicleSourceStatus, 0, len(protocols))
	for _, protocol := range protocols {
		protocol = strings.TrimSpace(protocol)
		if protocol == "" {
			continue
		}
		statuses = append(statuses, VehicleSourceStatus{
			Protocol:    protocol,
			Online:      containsString(onlineProtocols, protocol),
			LastSeen:    lastSeen,
			HasRealtime: true,
		})
	}
	return completeVehicleSourceStatus(statuses, "")
}

func NewService(store Store) *Service {
	return &Service{store: store}
}

func NewServiceWithRuntime(store Store, runtime RuntimeInfo) *Service {
	return &Service{store: store, runtime: runtime}
}

func (s *Service) DashboardSummary(ctx context.Context) (DashboardSummary, error) {
	return s.store.DashboardSummary(ctx)
}

func (s *Service) Vehicles(ctx context.Context, query url.Values) (Page[VehicleRow], error) {
	return s.store.Vehicles(ctx, query)
}

func (s *Service) ResolveVehicleIdentity(ctx context.Context, keyword string, protocol string) (VehicleIdentityResolution, error) {
	keyword = strings.TrimSpace(keyword)
	if keyword == "" {
		return VehicleIdentityResolution{LookupKey: keyword, Protocols: []string{}}, nil
	}
	vehicleQuery := url.Values{"keyword": {keyword}, "limit": {"20"}}
	if protocol = strings.TrimSpace(protocol); protocol != "" {
		vehicleQuery.Set("protocol", protocol)
	}
	vehicles, err := s.store.Vehicles(ctx, vehicleQuery)
	if err != nil {
		return VehicleIdentityResolution{}, err
	}
	return buildVehicleIdentityResolution(keyword, vehicles.Items), nil
}

func (s *Service) VehicleCoverage(ctx context.Context, query url.Values) (Page[VehicleCoverageRow], error) {
	return s.store.VehicleCoverage(ctx, query)
}

func (s *Service) VehicleCoverageSummary(ctx context.Context, query url.Values) (VehicleCoverageSummary, error) {
	return s.store.VehicleCoverageSummary(ctx, query)
}

func (s *Service) VehicleServiceSummary(ctx context.Context) (VehicleServiceSummary, error) {
	return s.store.VehicleServiceSummary(ctx)
}

func (s *Service) VehicleRealtime(ctx context.Context, query url.Values) (Page[VehicleRealtimeRow], error) {
	resolvedQuery, err := s.resolveVehicleQuery(ctx, query)
	if err != nil {
		return Page[VehicleRealtimeRow]{}, err
	}
	return s.store.VehicleRealtime(ctx, resolvedQuery)
}

func (s *Service) VehicleServiceOverview(ctx context.Context, keyword string, protocol string) (VehicleServiceOverview, error) {
	keyword = strings.TrimSpace(keyword)
	protocol = strings.TrimSpace(protocol)
	if batchStore, ok := s.store.(VehicleOverviewBatchStore); ok {
		page, err := batchStore.VehicleServiceOverviews(ctx, VehicleOverviewBatchQuery{
			Keywords: []string{keyword},
			Protocol: protocol,
			Limit:    1,
		})
		if err != nil {
			return VehicleServiceOverview{}, err
		}
		if len(page.Items) > 0 {
			return page.Items[0], nil
		}
		return *buildVehicleServiceOverview("", keyword, &VehicleIdentityResolution{LookupKey: keyword, Protocols: []string{}}, nil, nil, nil, Page[HistoryLocationRow]{}, Page[RawFrameRow]{}, Page[DailyMileageRow]{}, Page[QualityIssueRow]{}), nil
	}
	vehicleQuery := url.Values{"keyword": {keyword}, "limit": {"20"}}
	if protocol != "" {
		vehicleQuery.Set("protocol", protocol)
	}
	vehicles, err := s.store.Vehicles(ctx, vehicleQuery)
	if err != nil {
		return VehicleServiceOverview{}, err
	}
	resolution := buildVehicleIdentityResolution(keyword, vehicles.Items)
	identity := resolveVehicleIdentity(keyword, vehicles.Items)
	resolvedVIN := ""
	if identity != nil && strings.TrimSpace(identity.VIN) != "" {
		resolvedVIN = identity.VIN
	} else if resolution.Resolved {
		resolvedVIN = resolution.VIN
	}
	if resolvedVIN == "" {
		return *buildVehicleServiceOverview("", keyword, &resolution, nil, nil, nil, Page[HistoryLocationRow]{}, Page[RawFrameRow]{}, Page[DailyMileageRow]{}, Page[QualityIssueRow]{}), nil
	}

	realtimeQuery := url.Values{"vin": {resolvedVIN}, "limit": {"1"}}
	if protocol != "" {
		realtimeQuery.Set("protocol", protocol)
	}
	realtimeSummary, err := s.store.VehicleRealtime(ctx, realtimeQuery)
	if err != nil {
		return VehicleServiceOverview{}, err
	}
	var summary *VehicleRealtimeRow
	if len(realtimeSummary.Items) > 0 {
		summary = &realtimeSummary.Items[0]
	}
	sourceStatus := vehicleSourceStatus(vehicles.Items, nil, nil, nil, nil)
	overview := buildVehicleServiceOverview(resolvedVIN, keyword, &resolution, identity, summary, sourceStatus, Page[HistoryLocationRow]{}, Page[RawFrameRow]{}, Page[DailyMileageRow]{}, Page[QualityIssueRow]{})
	return *overview, nil
}

func (s *Service) VehicleServiceOverviews(ctx context.Context, query VehicleOverviewBatchQuery) (Page[VehicleServiceOverview], error) {
	keywords, total, limit, offset := overviewBatchPage(query)
	if offset >= total {
		return Page[VehicleServiceOverview]{Items: []VehicleServiceOverview{}, Total: total, Limit: limit, Offset: offset}, nil
	}
	query.Keywords = keywords
	query.Limit = limit
	query.Offset = offset
	if batchStore, ok := s.store.(VehicleOverviewBatchStore); ok {
		page, err := batchStore.VehicleServiceOverviews(ctx, query)
		if err != nil {
			return Page[VehicleServiceOverview]{}, err
		}
		page.Total = total
		page.Limit = limit
		page.Offset = offset
		return page, nil
	}
	items := make([]VehicleServiceOverview, 0, len(keywords))
	for _, keyword := range keywords {
		overview, err := s.VehicleServiceOverview(ctx, keyword, query.Protocol)
		if err != nil {
			return Page[VehicleServiceOverview]{}, err
		}
		items = append(items, overview)
	}
	return Page[VehicleServiceOverview]{Items: items, Total: total, Limit: limit, Offset: offset}, nil
}

func (s *Service) VehicleDetail(ctx context.Context, vin string, protocol string) (VehicleDetail, error) {
	keyword := strings.TrimSpace(vin)
	protocol = strings.TrimSpace(protocol)
	vehicleQuery := url.Values{"keyword": {keyword}, "limit": {"10"}}
	vehicles, err := s.store.Vehicles(ctx, vehicleQuery)
	if err != nil {
		return VehicleDetail{}, err
	}
	resolution := buildVehicleIdentityResolution(keyword, vehicles.Items)
	identity := resolveVehicleIdentity(keyword, vehicles.Items)
	resolvedVIN := ""
	if identity != nil && strings.TrimSpace(identity.VIN) != "" {
		resolvedVIN = identity.VIN
	} else if resolution.Resolved {
		resolvedVIN = resolution.VIN
	}
	queryVIN := resolvedVIN
	if queryVIN == "" {
		queryVIN = keyword
	}
	if resolvedVIN == "" {
		qualityQuery := url.Values{"keyword": {keyword}, "limit": {"20"}}
		if protocol != "" {
			qualityQuery.Set("protocol", protocol)
		}
		quality, err := s.store.QualityIssues(ctx, qualityQuery)
		if err != nil {
			return VehicleDetail{}, err
		}
		return VehicleDetail{
			VIN:             "",
			LookupKey:       keyword,
			LookupResolved:  false,
			Resolution:      &resolution,
			ServiceStatus:   buildVehicleServiceStatus(false, nil),
			ServiceOverview: buildVehicleServiceOverview("", keyword, &resolution, nil, nil, nil, Page[HistoryLocationRow]{}, Page[RawFrameRow]{}, Page[DailyMileageRow]{}, quality),
			Sources:         []string{},
			SourceStatus:    []VehicleSourceStatus{},
			Realtime:        []RealtimeLocationRow{},
			History:         Page[HistoryLocationRow]{Items: []HistoryLocationRow{}, Limit: 20, Offset: 0},
			Raw:             Page[RawFrameRow]{Items: []RawFrameRow{}, Limit: 10, Offset: 0},
			Mileage:         Page[DailyMileageRow]{Items: []DailyMileageRow{}, Limit: 20, Offset: 0},
			Quality:         quality,
		}, nil
	}

	realtimeQuery := url.Values{"vin": {queryVIN}, "limit": {"20"}}
	historyQuery := url.Values{"vin": {queryVIN}, "limit": {"20"}}
	rawQuery := RawFrameQuery{VIN: queryVIN, IncludeFields: true, Limit: 10}
	mileageQuery := url.Values{"vin": {queryVIN}, "limit": {"20"}}
	qualityQuery := url.Values{"vin": {queryVIN}, "limit": {"20"}}
	if protocol != "" {
		realtimeQuery.Set("protocol", protocol)
		historyQuery.Set("protocol", protocol)
		rawQuery.Protocol = protocol
		qualityQuery.Set("protocol", protocol)
	}
	realtimeSummary, err := s.store.VehicleRealtime(ctx, url.Values{"vin": {queryVIN}, "limit": {"1"}})
	if err != nil {
		return VehicleDetail{}, err
	}
	var summary *VehicleRealtimeRow
	if len(realtimeSummary.Items) > 0 {
		summary = &realtimeSummary.Items[0]
	}
	realtime, err := s.store.RealtimeLocations(ctx, realtimeQuery)
	if err != nil {
		return VehicleDetail{}, err
	}
	history, err := s.store.HistoryLocationsFromTDengine(ctx, historyQuery)
	if err != nil {
		return VehicleDetail{}, err
	}
	raw, err := s.RawFrames(ctx, rawQuery)
	if err != nil {
		return VehicleDetail{}, err
	}
	mileage, err := s.store.DailyMileage(ctx, mileageQuery)
	if err != nil {
		return VehicleDetail{}, err
	}
	quality, err := s.store.QualityIssues(ctx, qualityQuery)
	if err != nil {
		return VehicleDetail{}, err
	}
	sourceStatus := vehicleSourceStatus(vehicles.Items, realtime.Items, history.Items, raw.Items, mileage.Items)
	sourceStatus = s.enrichVehicleSourceStatus(ctx, queryVIN, sourceStatus)
	sourceStatus = completeVehicleSourceStatus(sourceStatus, protocol)
	serviceStatus := buildVehicleServiceStatus(true, sourceStatus)
	resolution.ServiceStatus = serviceStatus
	if identity != nil {
		identity.ServiceStatus = serviceStatus
	}
	if summary != nil {
		summary.ServiceStatus = serviceStatus
	}
	serviceOverview := buildVehicleServiceOverview(resolvedVIN, keyword, &resolution, identity, summary, sourceStatus, history, raw, mileage, quality)
	serviceOverview.ServiceStatus = serviceStatus
	return VehicleDetail{
		VIN:               resolvedVIN,
		LookupKey:         keyword,
		LookupResolved:    resolvedVIN != "",
		Resolution:        &resolution,
		Identity:          identity,
		RealtimeSummary:   summary,
		ServiceStatus:     serviceStatus,
		ServiceOverview:   serviceOverview,
		SourceConsistency: buildVehicleSourceConsistency(sourceStatus, realtime.Items, protocol),
		Sources:           sourceNames(sourceStatus),
		SourceStatus:      sourceStatus,
		Realtime:          realtime.Items,
		History:           history,
		Raw:               raw,
		Mileage:           mileage,
		Quality:           quality,
	}, nil
}

func buildVehicleSourceConsistency(statuses []VehicleSourceStatus, realtime []RealtimeLocationRow, protocol string) *VehicleSourceConsistency {
	consistency := &VehicleSourceConsistency{
		SourceCount: len(statuses),
		Scope:       "all_sources",
	}
	if strings.TrimSpace(protocol) != "" {
		consistency.Scope = "single_source"
	}
	if consistency.SourceCount == 0 {
		seen := map[string]struct{}{}
		for _, row := range realtime {
			if strings.TrimSpace(row.Protocol) == "" {
				continue
			}
			seen[row.Protocol] = struct{}{}
		}
		consistency.SourceCount = len(seen)
	}
	for _, status := range statuses {
		if status.Online {
			consistency.OnlineSourceCount++
		}
		if vehicleSourceEvidenceMissing(status) {
			consistency.MissingProtocols = append(consistency.MissingProtocols, status.Protocol)
		}
	}
	var minMileage, maxMileage float64
	hasMileage := false
	var minTime, maxTime time.Time
	hasTime := false
	for _, row := range realtime {
		if row.Longitude != 0 || row.Latitude != 0 {
			consistency.LocatedSourceCount++
		}
		if row.TotalMileageKm > 0 {
			if !hasMileage {
				minMileage = row.TotalMileageKm
				maxMileage = row.TotalMileageKm
				hasMileage = true
			} else {
				minMileage = math.Min(minMileage, row.TotalMileageKm)
				maxMileage = math.Max(maxMileage, row.TotalMileageKm)
			}
		}
		if parsed, ok := parseVehicleServiceTime(row.LastSeen); ok {
			if !hasTime {
				minTime = parsed
				maxTime = parsed
				hasTime = true
			} else {
				if parsed.Before(minTime) {
					minTime = parsed
				}
				if parsed.After(maxTime) {
					maxTime = parsed
				}
			}
		}
	}
	for _, status := range statuses {
		if parsed, ok := parseVehicleServiceTime(status.LastSeen); ok {
			if !hasTime {
				minTime = parsed
				maxTime = parsed
				hasTime = true
			} else {
				if parsed.Before(minTime) {
					minTime = parsed
				}
				if parsed.After(maxTime) {
					maxTime = parsed
				}
			}
		}
	}
	if hasMileage {
		consistency.MileageDeltaKm = maxMileage - minMileage
	}
	if hasTime {
		consistency.SourceTimeDeltaSeconds = maxTime.Sub(minTime).Seconds()
	}
	applyVehicleSourceConsistencyDiagnosis(consistency)
	return consistency
}

func vehicleSourceEvidenceMissing(status VehicleSourceStatus) bool {
	return strings.TrimSpace(status.Protocol) != "" &&
		!status.Online &&
		strings.TrimSpace(status.LastSeen) == "" &&
		!status.HasRealtime &&
		!status.HasHistory &&
		!status.HasRaw &&
		!status.HasMileage
}

func applyVehicleSourceConsistencyDiagnosis(consistency *VehicleSourceConsistency) {
	if consistency == nil {
		return
	}
	switch {
	case consistency.SourceCount <= 0:
		consistency.Status = "no_source"
		consistency.Severity = "warning"
		consistency.Title = "暂无来源"
		consistency.Detail = "当前车辆没有可用于交叉校验的数据来源。"
	case consistency.SourceCount == 1:
		consistency.Status = "single_source"
		consistency.Severity = "warning"
		consistency.Title = "单一来源"
		consistency.Detail = "当前车辆只有一个数据来源，无法做跨来源一致性校验。"
	case consistency.OnlineSourceCount <= 0:
		consistency.Status = "offline"
		consistency.Severity = "error"
		consistency.Title = "全部来源离线"
		consistency.Detail = sourceCoverageDetail(consistency.SourceCount, consistency.OnlineSourceCount, "无法判断实时一致性。")
	case len(consistency.MissingProtocols) > 0:
		consistency.Status = "degraded"
		consistency.Severity = "warning"
		consistency.Title = "来源不完整"
		consistency.Detail = sourceCoverageDetail(consistency.SourceCount, consistency.OnlineSourceCount, "车辆服务可用但缺少 "+strings.Join(consistency.MissingProtocols, "、")+" 来源。")
	case consistency.OnlineSourceCount < consistency.SourceCount:
		consistency.Status = "degraded"
		consistency.Severity = "warning"
		consistency.Title = "来源不完整"
		consistency.Detail = sourceCoverageDetail(consistency.SourceCount, consistency.OnlineSourceCount, "车辆服务可用但需要关注离线来源。")
	case consistency.MileageDeltaKm > 5:
		consistency.Status = "mileage_divergent"
		consistency.Severity = "warning"
		consistency.Title = "里程差异偏大"
		consistency.Detail = "多个来源的实时总里程差异超过 5 km，请核对来源解析、单位和上报时间。"
	case consistency.SourceTimeDeltaSeconds > 300:
		consistency.Status = "time_divergent"
		consistency.Severity = "warning"
		consistency.Title = "来源时间差偏大"
		consistency.Detail = "多个来源的最新上报时间相差超过 5 分钟，请关注转发延迟或链路断点。"
	default:
		consistency.Status = "consistent"
		consistency.Severity = "ok"
		consistency.Title = "来源一致"
		consistency.Detail = sourceCoverageDetail(consistency.SourceCount, consistency.OnlineSourceCount, "多源实时状态一致。")
	}
}

func parseVehicleServiceTime(value string) (time.Time, bool) {
	value = strings.TrimSpace(value)
	if value == "" {
		return time.Time{}, false
	}
	layouts := []string{time.RFC3339, "2006-01-02 15:04:05", "2006-01-02T15:04:05-07:00"}
	for _, layout := range layouts {
		if parsed, err := time.Parse(layout, value); err == nil {
			return parsed, true
		}
	}
	return time.Time{}, false
}

func buildVehicleServiceOverview(vin string, lookupKey string, resolution *VehicleIdentityResolution, identity *VehicleRow, summary *VehicleRealtimeRow, statuses []VehicleSourceStatus, history Page[HistoryLocationRow], raw Page[RawFrameRow], mileage Page[DailyMileageRow], quality Page[QualityIssueRow]) *VehicleServiceOverview {
	overview := &VehicleServiceOverview{
		VIN:               strings.TrimSpace(vin),
		Plate:             "",
		Phone:             "",
		OEM:               "",
		Protocols:         sourceNames(statuses),
		CoverageStatus:    "no_data",
		SourceCount:       len(statuses),
		OnlineSourceCount: 0,
		HistoryCount:      pageCount(history.Total, len(history.Items)),
		RawCount:          pageCount(raw.Total, len(raw.Items)),
		MileageCount:      pageCount(mileage.Total, len(mileage.Items)),
		QualityIssueCount: pageCount(quality.Total, len(quality.Items)),
	}
	if overview.VIN == "" && resolution != nil && resolution.Resolved {
		overview.VIN = strings.TrimSpace(resolution.VIN)
	}
	if overview.VIN == "" {
		overview.VIN = strings.TrimSpace(lookupKey)
	}
	if resolution != nil {
		overview.Plate = resolution.Plate
		overview.Phone = resolution.Phone
		overview.OEM = resolution.OEM
		if len(overview.Protocols) == 0 {
			overview.Protocols = append([]string(nil), resolution.Protocols...)
			overview.SourceCount = len(overview.Protocols)
		}
		overview.LastSeen = latestString(overview.LastSeen, resolution.LastSeen)
	}
	if identity != nil {
		overview.Plate = firstNonEmpty(overview.Plate, identity.Plate)
		overview.Phone = firstNonEmpty(overview.Phone, identity.Phone)
		overview.OEM = firstNonEmpty(overview.OEM, identity.OEM)
		overview.LastSeen = latestString(overview.LastSeen, identity.LastSeen)
	}
	if summary != nil {
		overview.Plate = firstNonEmpty(overview.Plate, summary.Plate)
		overview.Phone = firstNonEmpty(overview.Phone, summary.Phone)
		overview.OEM = firstNonEmpty(overview.OEM, summary.OEM)
		overview.PrimaryProtocol = summary.PrimaryProtocol
		overview.LastSeen = latestString(overview.LastSeen, summary.LastSeen)
		overview.RealtimeCount = pageCount(summary.SourceCount, len(summary.Protocols))
		if len(statuses) == 0 {
			overview.SourceCount = summary.SourceCount
			overview.OnlineSourceCount = summary.OnlineSourceCount
		}
		if len(overview.Protocols) == 0 {
			overview.Protocols = append([]string(nil), summary.Protocols...)
		}
	}
	for _, status := range statuses {
		if status.Online {
			overview.OnlineSourceCount++
		}
		if overview.PrimaryProtocol == "" && status.Online {
			overview.PrimaryProtocol = status.Protocol
		}
		overview.LastSeen = latestString(overview.LastSeen, status.LastSeen)
	}
	if overview.PrimaryProtocol == "" && len(overview.Protocols) > 0 {
		overview.PrimaryProtocol = overview.Protocols[0]
	}
	overview.CoverageStatus = coverageStatus(overview.SourceCount, overview.OnlineSourceCount)
	resolved := identity != nil && strings.TrimSpace(identity.VIN) != ""
	if !resolved && resolution != nil {
		resolved = resolution.Resolved
	}
	applyVehicleServiceOverviewDerivedFields(overview, resolved)
	overview.SourceConsistency.MissingProtocols = missingProtocolsFromStatuses(statuses)
	applyVehicleSourceConsistencyDiagnosis(overview.SourceConsistency)
	return overview
}

func applyVehicleServiceOverviewDerivedFields(overview *VehicleServiceOverview, resolved bool) {
	if overview == nil {
		return
	}
	overview.CoverageStatus = coverageStatus(overview.SourceCount, overview.OnlineSourceCount)
	overview.ServiceStatus = buildVehicleServiceStatus(resolved, statusesForOverview(overview))
	overview.SourceConsistency = &VehicleSourceConsistency{
		SourceCount:       overview.SourceCount,
		OnlineSourceCount: overview.OnlineSourceCount,
		MissingProtocols:  missingCanonicalProtocols(overview.Protocols),
		Scope:             "all_sources",
	}
	applyVehicleSourceConsistencyDiagnosis(overview.SourceConsistency)
}

func statusesForOverview(overview *VehicleServiceOverview) []VehicleSourceStatus {
	statuses := make([]VehicleSourceStatus, 0, overview.SourceCount)
	for index, protocol := range overview.Protocols {
		statuses = append(statuses, VehicleSourceStatus{
			Protocol: protocol,
			Online:   index < overview.OnlineSourceCount,
			LastSeen: overview.LastSeen,
		})
	}
	for len(statuses) < overview.SourceCount {
		statuses = append(statuses, VehicleSourceStatus{
			Protocol: "UNKNOWN",
			Online:   len(statuses) < overview.OnlineSourceCount,
			LastSeen: overview.LastSeen,
		})
	}
	return statuses
}

func pageCount(total int, itemCount int) int {
	if total > 0 {
		return total
	}
	return itemCount
}

func coverageStatus(sourceCount int, onlineSourceCount int) string {
	if sourceCount <= 0 {
		return "no_data"
	}
	if onlineSourceCount <= 0 {
		return "offline"
	}
	if onlineSourceCount < sourceCount {
		return "partial"
	}
	return "online"
}

func (s *Service) enrichVehicleSourceStatus(ctx context.Context, vin string, statuses []VehicleSourceStatus) []VehicleSourceStatus {
	for index := range statuses {
		protocol := statuses[index].Protocol
		if protocol == "" {
			continue
		}
		if !statuses[index].HasHistory {
			query := url.Values{"vin": {vin}, "protocol": {protocol}, "limit": {"1"}}
			if page, err := s.store.HistoryLocationsFromTDengine(ctx, query); err == nil && len(page.Items) > 0 {
				statuses[index].HasHistory = true
				statuses[index].LastSeen = latestString(statuses[index].LastSeen, firstNonEmpty(page.Items[0].ServerTime, page.Items[0].DeviceTime))
			}
		}
		if !statuses[index].HasRaw {
			page, err := s.store.RawFrames(ctx, RawFrameQuery{VIN: vin, Protocol: protocol, Limit: 1})
			if err == nil && len(page.Items) > 0 {
				statuses[index].HasRaw = true
				statuses[index].LastSeen = latestString(statuses[index].LastSeen, firstNonEmpty(page.Items[0].ServerTime, page.Items[0].DeviceTime))
			}
		}
	}
	return statuses
}

func resolveVehicleIdentity(keyword string, vehicles []VehicleRow) *VehicleRow {
	keyword = strings.TrimSpace(keyword)
	if keyword == "" {
		return nil
	}
	for index := range vehicles {
		if strings.EqualFold(vehicles[index].VIN, keyword) {
			return &vehicles[index]
		}
	}
	for index := range vehicles {
		if strings.EqualFold(vehicles[index].Plate, keyword) || strings.EqualFold(vehicles[index].Phone, keyword) {
			return &vehicles[index]
		}
	}
	if len(vehicles) > 0 {
		return &vehicles[0]
	}
	return nil
}

func isLikelyVIN(value string) bool {
	value = strings.ToUpper(strings.TrimSpace(value))
	if len(value) != 17 {
		return false
	}
	for _, char := range value {
		if char >= '0' && char <= '9' {
			continue
		}
		if char >= 'A' && char <= 'Z' && char != 'I' && char != 'O' && char != 'Q' {
			continue
		}
		return false
	}
	return true
}

func (s *Service) RealtimeLocations(ctx context.Context, query url.Values) (Page[RealtimeLocationRow], error) {
	resolvedQuery, err := s.resolveVehicleQuery(ctx, query)
	if err != nil {
		return Page[RealtimeLocationRow]{}, err
	}
	return s.store.RealtimeLocations(ctx, resolvedQuery)
}

func (s *Service) HistoryLocations(ctx context.Context, query url.Values) (Page[HistoryLocationRow], error) {
	resolvedQuery, err := s.resolveVehicleQuery(ctx, query)
	if err != nil {
		return Page[HistoryLocationRow]{}, err
	}
	return s.store.HistoryLocationsFromTDengine(ctx, resolvedQuery)
}

func (s *Service) RawFrames(ctx context.Context, query RawFrameQuery) (Page[RawFrameRow], error) {
	if query.Limit <= 0 || query.Limit > 500 {
		query.Limit = 100
	}
	if query.IncludeFields && !rawFrameQueryHasNarrowScope(query) {
		return Page[RawFrameRow]{}, clientError{
			Code:    "RAW_FRAME_SCOPE_REQUIRED",
			Message: "RAW 解析字段查询需要提供车辆或时间范围",
		}
	}
	if strings.TrimSpace(query.VIN) == "" {
		query.VIN = query.Keyword
	}
	resolvedVIN, err := s.resolveVehicleVIN(ctx, query.VIN, query.Protocol)
	if err != nil {
		return Page[RawFrameRow]{}, err
	}
	if resolvedVIN != "" {
		query.VIN = resolvedVIN
	}
	return s.store.RawFrames(ctx, query)
}

func rawFrameQueryHasNarrowScope(query RawFrameQuery) bool {
	return strings.TrimSpace(query.VIN) != "" ||
		strings.TrimSpace(query.Keyword) != "" ||
		strings.TrimSpace(query.DateFrom) != "" ||
		strings.TrimSpace(query.DateTo) != "" ||
		len(query.Fields) > 0
}

func (s *Service) MileageSummary(ctx context.Context, query url.Values) (MileageSummary, error) {
	resolvedQuery, err := s.resolveVehicleQuery(ctx, query)
	if err != nil {
		return MileageSummary{}, err
	}
	return s.store.MileageSummary(ctx, resolvedQuery)
}

func (s *Service) DailyMileage(ctx context.Context, query url.Values) (Page[DailyMileageRow], error) {
	resolvedQuery, err := s.resolveVehicleQuery(ctx, query)
	if err != nil {
		return Page[DailyMileageRow]{}, err
	}
	return s.store.DailyMileage(ctx, resolvedQuery)
}

func (s *Service) OnlineStatisticsSummary(ctx context.Context, query url.Values) (OnlineStatisticsSummary, error) {
	resolvedQuery, err := s.resolveVehicleQuery(ctx, query)
	if err != nil {
		return OnlineStatisticsSummary{}, err
	}
	coverage, err := s.store.VehicleCoverageSummary(ctx, resolvedQuery)
	if err != nil {
		return OnlineStatisticsSummary{}, err
	}
	serviceSummary, err := s.store.VehicleServiceSummary(ctx)
	if err != nil {
		return OnlineStatisticsSummary{}, err
	}
	opsHealth, err := s.store.OpsHealth(ctx)
	if err != nil {
		return OnlineStatisticsSummary{}, err
	}
	total := coverage.TotalVehicles
	online := coverage.OnlineVehicles
	offline := total - online
	if offline < 0 {
		offline = 0
	}
	rate := 0.0
	if total > 0 {
		rate = float64(online) / float64(total) * 100
	}
	return OnlineStatisticsSummary{
		VehicleCount:        total,
		OnlineVehicleCount:  online,
		OfflineVehicleCount: offline,
		OnlineRatePercent:   rate,
		RedisOnlineKeys:     opsHealth.RedisOnlineKeys,
		ProtocolStats:       serviceSummary.Protocols,
		Evidence:            "由车辆服务覆盖汇总、实时来源状态和 Redis 在线 key 计算",
	}, nil
}

func (s *Service) OnlineVehicleStatuses(ctx context.Context, query url.Values) (Page[OnlineVehicleStatusRow], error) {
	resolvedQuery, err := s.resolveVehicleQuery(ctx, query)
	if err != nil {
		return Page[OnlineVehicleStatusRow]{}, err
	}
	coverage, err := s.store.VehicleCoverage(ctx, resolvedQuery)
	if err != nil {
		return Page[OnlineVehicleStatusRow]{}, err
	}
	now := time.Now()
	items := make([]OnlineVehicleStatusRow, 0, len(coverage.Items))
	for _, row := range coverage.Items {
		items = append(items, OnlineVehicleStatusRow{
			VIN:                    row.VIN,
			Plate:                  row.Plate,
			Phone:                  row.Phone,
			OEM:                    row.OEM,
			Protocols:              append([]string(nil), row.Protocols...),
			Online:                 row.Online,
			LastSeen:               row.LastSeen,
			OfflineDurationMinutes: offlineDurationMinutes(row.Online, row.LastSeen, now),
			SourceCount:            row.SourceCount,
			OnlineSourceCount:      row.OnlineSourceCount,
			BindingStatus:          row.BindingStatus,
		})
	}
	return Page[OnlineVehicleStatusRow]{
		Items:  items,
		Total:  coverage.Total,
		Limit:  coverage.Limit,
		Offset: coverage.Offset,
	}, nil
}

func offlineDurationMinutes(online bool, lastSeen string, now time.Time) *int {
	if online {
		value := 0
		return &value
	}
	parsed, ok := parseVehicleServiceTime(lastSeen)
	if !ok {
		return nil
	}
	minutes := int(now.Sub(parsed).Minutes())
	if minutes < 0 {
		minutes = 0
	}
	return &minutes
}

func (s *Service) QualitySummary(ctx context.Context, query url.Values) (QualitySummary, error) {
	return s.store.QualitySummary(ctx, query)
}

func (s *Service) QualityIssues(ctx context.Context, query url.Values) (Page[QualityIssueRow], error) {
	return s.store.QualityIssues(ctx, query)
}

func (s *Service) QualityNotificationPlan(ctx context.Context, query url.Values) (QualityNotificationPlan, error) {
	summary, err := s.store.QualitySummary(ctx, query)
	if err != nil {
		return QualityNotificationPlan{}, err
	}
	issueQuery := cloneValues(query)
	if issueQuery.Get("limit") == "" {
		issueQuery.Set("limit", "20")
	}
	issues, err := s.store.QualityIssues(ctx, issueQuery)
	if err != nil {
		return QualityNotificationPlan{}, err
	}
	health, err := s.store.OpsHealth(ctx)
	if err != nil {
		return QualityNotificationPlan{}, err
	}
	health.Runtime = s.runtime
	rules := qualityNotificationRules(summary, health)
	activeRuleCount := 0
	p0RuleCount := 0
	for _, rule := range rules {
		if rule.Count <= 0 {
			continue
		}
		activeRuleCount++
		if rule.Level == "P0" {
			p0RuleCount++
		}
	}
	return QualityNotificationPlan{
		Summary:         summary,
		Rules:           rules,
		Policies:        append([]QualityNotificationPolicy(nil), qualityNotificationPolicies...),
		PriorityIssues:  qualityPriorityIssues(issues.Items),
		ActiveRuleCount: activeRuleCount,
		P0RuleCount:     p0RuleCount,
	}, nil
}

func (s *Service) OpsHealth(ctx context.Context) (OpsHealth, error) {
	health, err := s.store.OpsHealth(ctx)
	if err != nil {
		return OpsHealth{}, err
	}
	health.Runtime = s.runtime
	return health, nil
}

func qualityNotificationRules(summary QualitySummary, health OpsHealth) []QualityAlertRule {
	rows := make([]QualityAlertRule, 0, len(qualityAlertRuleTemplates)+1)
	for _, item := range qualityAlertRuleTemplates {
		item.Count = qualityIssueCount(summary, item.IssueType)
		rows = append(rows, item)
	}
	storageWritable := health.TDengineWritable && health.MySQLWritable
	capacityCount := len(health.CapacityFindings)
	capacityRule := QualityAlertRule{
		IssueType: "CAPACITY_RISK",
		Title:     "容量与存储风险",
		Level:     "P2",
		Owner:     "基础设施",
		Trigger:   "Kafka Lag、连接容量、Redis 在线 Key 或存储读写异常",
		Notify:    "容量风险进入运维日报，超过阈值升级",
		SLA:       "当日评估",
		Count:     capacityCount,
	}
	if !storageWritable {
		capacityRule.Level = "P0"
		capacityRule.Notify = "立即通知基础设施值班人处理存储不可写"
		capacityRule.SLA = "15 分钟恢复"
		capacityRule.Count++
	}
	rows = append(rows, capacityRule)
	return rows
}

func qualityIssueCount(summary QualitySummary, issueType string) int {
	for _, item := range summary.IssueTypes {
		if item.Name == issueType {
			return item.Count
		}
	}
	return 0
}

func qualityPriorityIssues(rows []QualityIssueRow) []QualityPriorityIssue {
	out := make([]QualityPriorityIssue, 0, len(rows))
	for _, row := range rows {
		out = append(out, buildQualityPriorityIssue(row))
	}
	sort.Slice(out, func(i, j int) bool {
		if out[i].Priority != out[j].Priority {
			return out[i].Priority == "P0"
		}
		weightDelta := qualityIssuePriorityWeight[out[j].IssueType] - qualityIssuePriorityWeight[out[i].IssueType]
		if weightDelta != 0 {
			return weightDelta < 0
		}
		return out[i].LastSeen > out[j].LastSeen
	})
	if len(out) > 5 {
		out = out[:5]
	}
	return out
}

func buildQualityPriorityIssue(row QualityIssueRow) QualityPriorityIssue {
	actionLabel, actionDetail := qualityAction(row)
	priority := "P1"
	if row.Severity == "error" || row.IssueType == "NO_SOURCE" {
		priority = "P0"
	}
	lookup := qualityIssueLookup(row)
	dateFrom := evidenceDate(row.LastSeen)
	dateTo := nextEvidenceDate(dateFrom)
	realtimeHash := buildHash("realtime", lookup, row.Protocol, nil)
	historyFilters := map[string]string{}
	if dateFrom != "" {
		historyFilters["dateFrom"] = dateFrom
	}
	if dateTo != "" {
		historyFilters["dateTo"] = dateTo
	}
	historyHash := buildHash("history", lookup, row.Protocol, historyFilters)
	rawFilters := cloneStringMap(historyFilters)
	rawFilters["tab"] = "raw"
	rawFilters["includeFields"] = "true"
	rawHash := buildHash("history-query", lookup, row.Protocol, rawFilters)
	vehicleHash := buildHash("detail", lookup, row.Protocol, nil)
	item := QualityPriorityIssue{
		QualityIssueRow: row,
		Priority:        priority,
		ActionLabel:     actionLabel,
		ActionDetail:    actionDetail,
		SLA:             qualityIssueSLA(row.IssueType),
		VehicleLabel:    qualityVehicleLabel(row),
		RealtimeHash:    realtimeHash,
		HistoryHash:     historyHash,
		RawHash:         rawHash,
		VehicleHash:     vehicleHash,
	}
	item.NotificationText = qualityNotificationText(item)
	return item
}

func qualityAction(row QualityIssueRow) (string, string) {
	switch {
	case row.IssueType == "NO_SOURCE":
		return "确认平台转发", "车辆已绑定但没有任何来源证据，先确认平台转发、端口和订阅。"
	case row.IssueType == "VIN_MISSING" || strings.TrimSpace(row.VIN) == "":
		return "维护身份绑定", "数据已有来源但无法归并到 VIN，优先用车牌/手机号补齐绑定。"
	case row.IssueType == "LINK_GAP":
		return "排查来源链路", "来源存在上报间断，优先检查平台转发、网络和消费延迟。"
	case row.IssueType == "FIELD_MISSING":
		return "核对解析字段", "字段缺失会影响统计和展示，优先核对解析映射和原始 RAW。"
	default:
		return "查看车辆服务", "进入车辆服务详情，结合来源证据继续排查。"
	}
}

func qualityIssueSLA(issueType string) string {
	for _, item := range qualityAlertRuleTemplates {
		if item.IssueType == issueType {
			return item.SLA
		}
	}
	return "当日闭环"
}

func qualityVehicleLabel(row QualityIssueRow) string {
	identity := firstNonEmpty(strings.TrimSpace(row.VIN), strings.TrimSpace(row.Phone), strings.TrimSpace(row.SourceEndpoint), "-")
	if plate := strings.TrimSpace(row.Plate); plate != "" {
		return plate + " / " + identity
	}
	return identity
}

func qualityIssueLookup(row QualityIssueRow) string {
	return firstNonEmpty(strings.TrimSpace(row.VIN), strings.TrimSpace(row.Plate), strings.TrimSpace(row.Phone), strings.TrimSpace(row.SourceEndpoint))
}

func evidenceDate(value string) string {
	value = strings.TrimSpace(value)
	if len(value) < len("2006-01-02") {
		return ""
	}
	date := value[:len("2006-01-02")]
	if _, err := time.Parse("2006-01-02", date); err != nil {
		return ""
	}
	return date
}

func nextEvidenceDate(value string) string {
	if value == "" {
		return ""
	}
	date, err := time.Parse("2006-01-02", value)
	if err != nil {
		return ""
	}
	return date.AddDate(0, 0, 1).Format("2006-01-02")
}

func buildHash(page string, keyword string, protocol string, filters map[string]string) string {
	values := url.Values{}
	if keyword != "" {
		values.Set("keyword", keyword)
	}
	if protocol != "" {
		values.Set("protocol", protocol)
	}
	for key, value := range filters {
		if strings.TrimSpace(value) != "" {
			values.Set(key, value)
		}
	}
	query := values.Encode()
	if query == "" {
		return "#/" + page
	}
	return "#/" + page + "?" + query
}

func qualityNotificationText(row QualityPriorityIssue) string {
	return strings.Join([]string{
		"【" + row.Priority + " 告警通知】" + qualityIssueTitle(row.IssueType),
		"车辆：" + row.VehicleLabel,
		"数据来源：" + row.Protocol,
		"问题：" + qualityIssueTitle(row.IssueType),
		"建议动作：" + row.ActionLabel,
		"SLA：" + row.SLA,
		"最后时间：" + firstNonEmpty(row.LastSeen, "-"),
		"详情：" + firstNonEmpty(row.Detail, "-"),
		"实时定位：" + row.RealtimeHash,
		"轨迹证据：" + row.HistoryHash,
		"RAW证据：" + row.RawHash,
		"车辆服务：" + row.VehicleHash,
	}, "\n")
}

func qualityIssueTitle(issueType string) string {
	for _, item := range qualityAlertRuleTemplates {
		if item.IssueType == issueType {
			return item.Title
		}
	}
	if issueType == "CAPACITY_RISK" {
		return "容量与存储风险"
	}
	return issueType
}

func cloneStringMap(values map[string]string) map[string]string {
	out := make(map[string]string, len(values))
	for key, value := range values {
		out[key] = value
	}
	return out
}

func (s *Service) resolveVehicleQuery(ctx context.Context, query url.Values) (url.Values, error) {
	resolved := cloneValues(query)
	vin := firstNonEmpty(resolved.Get("vin"), resolved.Get("keyword"))
	if vin == "" {
		return resolved, nil
	}
	resolvedVIN, err := s.resolveVehicleVIN(ctx, vin, resolved.Get("protocol"))
	if err != nil {
		return nil, err
	}
	if resolvedVIN != "" {
		resolved.Set("vin", resolvedVIN)
	}
	return resolved, nil
}

func (s *Service) resolveVehicleVIN(ctx context.Context, keyword string, protocol string) (string, error) {
	keyword = strings.TrimSpace(keyword)
	if keyword == "" || isLikelyVIN(keyword) {
		return keyword, nil
	}
	vehicleQuery := url.Values{"keyword": {keyword}, "limit": {"10"}}
	if protocol = strings.TrimSpace(protocol); protocol != "" {
		vehicleQuery.Set("protocol", protocol)
	}
	vehicles, err := s.store.Vehicles(ctx, vehicleQuery)
	if err != nil {
		return "", err
	}
	identity := resolveVehicleIdentity(keyword, vehicles.Items)
	if identity == nil || strings.TrimSpace(identity.VIN) == "" {
		return keyword, nil
	}
	return identity.VIN, nil
}

func cloneValues(values url.Values) url.Values {
	cloned := make(url.Values, len(values))
	for key, current := range values {
		cloned[key] = append([]string(nil), current...)
	}
	return cloned
}

func normalizedKeywords(values []string) []string {
	out := make([]string, 0, len(values))
	seen := map[string]struct{}{}
	for _, value := range values {
		value = strings.TrimSpace(value)
		if value == "" {
			continue
		}
		if _, ok := seen[value]; ok {
			continue
		}
		seen[value] = struct{}{}
		out = append(out, value)
	}
	return out
}

func overviewBatchPage(query VehicleOverviewBatchQuery) ([]string, int, int, int) {
	keywords := normalizedKeywords(query.Keywords)
	total := len(keywords)
	limit := query.Limit
	offset := query.Offset
	if offset < 0 {
		offset = 0
	}
	if limit <= 0 || limit > 200 {
		limit = 200
	}
	if offset >= total {
		return []string{}, total, limit, offset
	}
	end := offset + limit
	if end > total {
		end = total
	}
	return keywords[offset:end], total, limit, offset
}

func vehicleSourceStatus(vehicles []VehicleRow, realtime []RealtimeLocationRow, history []HistoryLocationRow, raw []RawFrameRow, mileage []DailyMileageRow) []VehicleSourceStatus {
	statusByProtocol := map[string]*VehicleSourceStatus{}
	ensure := func(protocol string) *VehicleSourceStatus {
		protocol = strings.TrimSpace(protocol)
		if protocol == "" {
			return nil
		}
		if current := statusByProtocol[protocol]; current != nil {
			return current
		}
		current := &VehicleSourceStatus{Protocol: protocol}
		statusByProtocol[protocol] = current
		return current
	}
	setLastSeen := func(current *VehicleSourceStatus, value string) {
		value = strings.TrimSpace(value)
		if value == "" {
			return
		}
		if current.LastSeen == "" || value > current.LastSeen {
			current.LastSeen = value
		}
	}
	for _, row := range vehicles {
		if current := ensure(row.Protocol); current != nil {
			current.Online = current.Online || row.Online
			setLastSeen(current, row.LastSeen)
		}
	}
	for _, row := range realtime {
		if current := ensure(row.Protocol); current != nil {
			current.HasRealtime = true
			setLastSeen(current, row.LastSeen)
		}
	}
	for _, row := range history {
		if current := ensure(row.Protocol); current != nil {
			current.HasHistory = true
			setLastSeen(current, firstNonEmpty(row.ServerTime, row.DeviceTime))
		}
	}
	for _, row := range raw {
		if current := ensure(row.Protocol); current != nil {
			current.HasRaw = true
			setLastSeen(current, firstNonEmpty(row.ServerTime, row.DeviceTime))
		}
	}
	for _, row := range mileage {
		if current := ensure(row.Source); current != nil {
			current.HasMileage = true
			setLastSeen(current, row.Date)
		}
	}
	out := make([]VehicleSourceStatus, 0, len(statusByProtocol))
	for _, current := range statusByProtocol {
		out = append(out, *current)
	}
	sort.Slice(out, func(i, j int) bool { return out[i].Protocol < out[j].Protocol })
	return out
}

func completeVehicleSourceStatus(statuses []VehicleSourceStatus, protocol string) []VehicleSourceStatus {
	protocol = strings.TrimSpace(protocol)
	if protocol != "" {
		for _, status := range statuses {
			if status.Protocol == protocol {
				return []VehicleSourceStatus{status}
			}
		}
		return []VehicleSourceStatus{{Protocol: protocol}}
	}
	byProtocol := map[string]VehicleSourceStatus{}
	for _, status := range statuses {
		if strings.TrimSpace(status.Protocol) == "" {
			continue
		}
		byProtocol[status.Protocol] = status
	}
	out := make([]VehicleSourceStatus, 0, len(canonicalVehicleProtocols)+len(statuses))
	seen := map[string]struct{}{}
	for _, protocol := range canonicalVehicleProtocols {
		if status, ok := byProtocol[protocol]; ok {
			out = append(out, status)
		} else {
			out = append(out, VehicleSourceStatus{Protocol: protocol})
		}
		seen[protocol] = struct{}{}
	}
	for _, status := range statuses {
		if _, ok := seen[status.Protocol]; ok || strings.TrimSpace(status.Protocol) == "" {
			continue
		}
		out = append(out, status)
	}
	return out
}

func buildVehicleServiceStatus(resolved bool, statuses []VehicleSourceStatus) *VehicleServiceStatus {
	if !resolved {
		return &VehicleServiceStatus{
			Status:   "identity_required",
			Severity: "warning",
			Title:    "身份未绑定",
			Detail:   "车辆关键词暂未解析到 VIN，需先维护身份绑定后才能形成完整车辆服务。",
		}
	}
	sourceCount := len(statuses)
	onlineSourceCount := 0
	for _, status := range statuses {
		if status.Online {
			onlineSourceCount++
		}
	}
	missingProtocols := missingProtocolsFromStatuses(statuses)
	if sourceCount == 0 || sourceCount == len(missingProtocols) {
		return &VehicleServiceStatus{
			Status:            "no_data",
			Severity:          "warning",
			Title:             "暂无数据来源",
			Detail:            "车辆已解析，但暂未查询到 32960、808 或 MQTT 数据来源。",
			SourceCount:       sourceCount,
			OnlineSourceCount: onlineSourceCount,
		}
	}
	if onlineSourceCount == 0 {
		return &VehicleServiceStatus{
			Status:            "offline",
			Severity:          "error",
			Title:             "车辆离线",
			Detail:            "所有已知数据来源均未在线，需要检查平台转发、终端上报或链路状态。",
			SourceCount:       sourceCount,
			OnlineSourceCount: onlineSourceCount,
		}
	}
	if len(missingProtocols) > 0 {
		return &VehicleServiceStatus{
			Status:            "degraded",
			Severity:          "warning",
			Title:             "来源不完整",
			Detail:            sourceCoverageDetail(sourceCount, onlineSourceCount, "车辆服务可用但缺少 "+strings.Join(missingProtocols, "、")+" 来源。"),
			SourceCount:       sourceCount,
			OnlineSourceCount: onlineSourceCount,
		}
	}
	if onlineSourceCount < sourceCount {
		return &VehicleServiceStatus{
			Status:            "degraded",
			Severity:          "warning",
			Title:             "来源不完整",
			Detail:            sourceCoverageDetail(sourceCount, onlineSourceCount, "车辆服务可用但需要关注离线来源。"),
			SourceCount:       sourceCount,
			OnlineSourceCount: onlineSourceCount,
		}
	}
	return &VehicleServiceStatus{
		Status:            "healthy",
		Severity:          "ok",
		Title:             "服务正常",
		Detail:            sourceCoverageDetail(sourceCount, onlineSourceCount, "全部已知来源在线。"),
		SourceCount:       sourceCount,
		OnlineSourceCount: onlineSourceCount,
	}
}

func missingProtocolsFromStatuses(statuses []VehicleSourceStatus) []string {
	missing := make([]string, 0, len(statuses))
	for _, status := range statuses {
		if vehicleSourceEvidenceMissing(status) {
			missing = append(missing, status.Protocol)
		}
	}
	return missing
}

func buildVehicleCoverageServiceStatus(row VehicleCoverageRow) *VehicleServiceStatus {
	if row.BindingStatus != "bound" {
		return &VehicleServiceStatus{
			Status:            "identity_required",
			Severity:          "warning",
			Title:             "身份未绑定",
			Detail:            "车辆身份绑定不完整，需先维护 VIN、车牌或手机号映射。",
			SourceCount:       row.SourceCount,
			OnlineSourceCount: row.OnlineSourceCount,
		}
	}
	if row.SourceCount == 0 {
		return &VehicleServiceStatus{
			Status:            "no_data",
			Severity:          "warning",
			Title:             "暂无数据来源",
			Detail:            "车辆已绑定，但暂未查询到 32960、808 或 MQTT 数据来源。",
			SourceCount:       row.SourceCount,
			OnlineSourceCount: row.OnlineSourceCount,
		}
	}
	if row.OnlineSourceCount == 0 {
		return &VehicleServiceStatus{
			Status:            "offline",
			Severity:          "error",
			Title:             "车辆离线",
			Detail:            "所有已知数据来源均未在线，需要检查平台转发、终端上报或链路状态。",
			SourceCount:       row.SourceCount,
			OnlineSourceCount: row.OnlineSourceCount,
		}
	}
	if len(row.MissingProtocols) > 0 {
		return &VehicleServiceStatus{
			Status:            "degraded",
			Severity:          "warning",
			Title:             "来源不完整",
			Detail:            sourceCoverageDetail(row.SourceCount, row.OnlineSourceCount, "车辆服务可用但缺少 "+strings.Join(row.MissingProtocols, "、")+" 来源。"),
			SourceCount:       row.SourceCount,
			OnlineSourceCount: row.OnlineSourceCount,
		}
	}
	if row.OnlineSourceCount < row.SourceCount {
		return &VehicleServiceStatus{
			Status:            "degraded",
			Severity:          "warning",
			Title:             "来源不完整",
			Detail:            sourceCoverageDetail(row.SourceCount, row.OnlineSourceCount, "车辆服务可用但需要关注离线来源。"),
			SourceCount:       row.SourceCount,
			OnlineSourceCount: row.OnlineSourceCount,
		}
	}
	return &VehicleServiceStatus{
		Status:            "healthy",
		Severity:          "ok",
		Title:             "服务正常",
		Detail:            sourceCoverageDetail(row.SourceCount, row.OnlineSourceCount, "全部来源在线。"),
		SourceCount:       row.SourceCount,
		OnlineSourceCount: row.OnlineSourceCount,
	}
}

func buildVehicleCoverageSourceConsistency(row VehicleCoverageRow) *VehicleSourceConsistency {
	consistency := &VehicleSourceConsistency{
		SourceCount:        row.SourceCount,
		OnlineSourceCount:  row.OnlineSourceCount,
		MissingProtocols:   row.MissingProtocols,
		Scope:              "coverage",
		LocatedSourceCount: 0,
	}
	applyVehicleSourceConsistencyDiagnosis(consistency)
	return consistency
}

func buildRealtimeServiceStatus(row VehicleRealtimeRow) *VehicleServiceStatus {
	return buildVehicleCoverageServiceStatus(VehicleCoverageRow{
		VIN:               row.VIN,
		Plate:             row.Plate,
		Phone:             row.Phone,
		OEM:               row.OEM,
		Protocols:         row.Protocols,
		MissingProtocols:  missingCanonicalProtocols(row.Protocols),
		SourceCount:       row.SourceCount,
		OnlineSourceCount: row.OnlineSourceCount,
		Online:            row.Online,
		LastSeen:          row.LastSeen,
		BindingStatus:     row.BindingStatus,
	})
}

func sourceCoverageDetail(sourceCount int, onlineSourceCount int, suffix string) string {
	return strconv.Itoa(onlineSourceCount) + "/" + strconv.Itoa(sourceCount) + " 个来源在线，" + suffix
}

func latestString(left string, right string) string {
	left = strings.TrimSpace(left)
	right = strings.TrimSpace(right)
	if left == "" {
		return right
	}
	if right == "" || left >= right {
		return left
	}
	return right
}

func sourceNames(statuses []VehicleSourceStatus) []string {
	out := make([]string, 0, len(statuses))
	for _, status := range statuses {
		out = append(out, status.Protocol)
	}
	return out
}

func appendIfMissing(values []string, value string) []string {
	value = strings.TrimSpace(value)
	if value == "" {
		return values
	}
	for _, current := range values {
		if current == value {
			return values
		}
	}
	return append(values, value)
}

func buildVehicleIdentityResolution(keyword string, vehicles []VehicleRow) VehicleIdentityResolution {
	keyword = strings.TrimSpace(keyword)
	result := VehicleIdentityResolution{LookupKey: keyword, Protocols: []string{}}
	identity := resolveVehicleIdentity(keyword, vehicles)
	if identity == nil || strings.TrimSpace(identity.VIN) == "" {
		if isLikelyVIN(keyword) {
			result.Resolved = true
			result.VIN = keyword
		}
		return result
	}
	result.Resolved = true
	result.VIN = identity.VIN
	result.Plate = identity.Plate
	result.Phone = identity.Phone
	result.OEM = identity.OEM
	for _, vehicle := range vehicles {
		if !strings.EqualFold(vehicle.VIN, identity.VIN) {
			continue
		}
		if result.ServiceStatus == nil && vehicle.ServiceStatus != nil {
			result.ServiceStatus = vehicle.ServiceStatus
		}
		if vehicle.Online {
			result.Online = true
		}
		if vehicle.LastSeen > result.LastSeen {
			result.LastSeen = vehicle.LastSeen
		}
		if result.Plate == "" {
			result.Plate = vehicle.Plate
		}
		if result.Phone == "" {
			result.Phone = vehicle.Phone
		}
		if result.OEM == "" {
			result.OEM = vehicle.OEM
		}
		result.Protocols = appendIfMissing(result.Protocols, vehicle.Protocol)
	}
	sort.Strings(result.Protocols)
	if result.ServiceStatus == nil {
		result.ServiceStatus = buildVehicleCoverageServiceStatus(VehicleCoverageRow{
			VIN:               result.VIN,
			Plate:             result.Plate,
			Phone:             result.Phone,
			OEM:               result.OEM,
			Protocols:         result.Protocols,
			SourceCount:       len(result.Protocols),
			OnlineSourceCount: boolToInt(result.Online),
			Online:            result.Online,
			LastSeen:          result.LastSeen,
			BindingStatus:     "bound",
		})
	}
	return result
}

func boolToInt(value bool) int {
	if value {
		return 1
	}
	return 0
}