package app

import (
	"context"
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"errors"
	"fmt"
	"strings"
	"time"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgxpool"
	goredis "github.com/redis/go-redis/v9"

	"github.com/geo-platform/tenant-api/internal/shared/auth"
	sharedcache "github.com/geo-platform/tenant-api/internal/shared/cache"
	"github.com/geo-platform/tenant-api/internal/shared/messaging/rabbitmq"
	"github.com/geo-platform/tenant-api/internal/shared/response"
	"github.com/geo-platform/tenant-api/internal/tenant/repository"
)

const desktopAccountHealthReportTTL = 24 * time.Hour

type DesktopAccountService struct {
	pool       *pgxpool.Pool
	repo       repository.DesktopAccountRepository
	clientRepo repository.DesktopClientRepository
	cache      sharedcache.Cache
	redis      *goredis.Client
	rabbitMQ   *rabbitmq.Client
	now        func() time.Time
}

func NewDesktopAccountService(
	pool *pgxpool.Pool,
	repo repository.DesktopAccountRepository,
	clientRepo repository.DesktopClientRepository,
	redis *goredis.Client,
	rabbitMQClient *rabbitmq.Client,
) *DesktopAccountService {
	return &DesktopAccountService{
		pool:       pool,
		repo:       repo,
		clientRepo: clientRepo,
		redis:      redis,
		rabbitMQ:   rabbitMQClient,
		now:        time.Now,
	}
}

func (s *DesktopAccountService) WithCache(c sharedcache.Cache) *DesktopAccountService {
	s.cache = c
	return s
}

type DesktopAccountView struct {
	ID                        string     `json:"id"`
	Platform                  string     `json:"platform"`
	PlatformUID               string     `json:"platform_uid"`
	DisplayName               string     `json:"display_name"`
	AvatarURL                 *string    `json:"avatar_url"`
	Health                    string     `json:"health"`
	RuntimeHealth             *string    `json:"runtime_health"`
	RuntimeVerifiedAt         *time.Time `json:"runtime_verified_at"`
	RuntimeCheckedAt          *time.Time `json:"runtime_checked_at"`
	RuntimeAuthState          *string    `json:"runtime_auth_state"`
	RuntimeProbeState         *string    `json:"runtime_probe_state"`
	RuntimeAuthReason         *string    `json:"runtime_auth_reason"`
	HealthSource              string     `json:"health_source"`
	ClientID                  *string    `json:"client_id"`
	AccountFingerprint        *string    `json:"account_fingerprint"`
	VerifiedAt                *time.Time `json:"verified_at"`
	Tags                      []string   `json:"tags"`
	SyncVersion               int64      `json:"sync_version"`
	DeletedAt                 *time.Time `json:"deleted_at"`
	DeleteRequestedAt         *time.Time `json:"delete_requested_at"`
	ClientOnline              *bool      `json:"client_online"`
	AccountSessionOnline      *bool      `json:"account_session_online"`
	TaskConsumerOnline        *bool      `json:"task_consumer_online"`
	ClientLastSeenAt          *time.Time `json:"client_last_seen_at"`
	ClientDeviceName          *string    `json:"client_device_name"`
	QueuedPublishTaskCount    int        `json:"queued_publish_task_count"`
	OldestQueuedPublishTaskAt *time.Time `json:"oldest_queued_publish_task_at"`
}

type DesktopAccountDeleteResult struct {
	Account                      DesktopAccountView `json:"account"`
	CancelledQueuedPublishTasks  int                `json:"cancelled_queued_publish_task_count"`
	CompletedServerSideUnbinding bool               `json:"completed_server_side_unbinding"`
}

type UpsertDesktopAccountRequest struct {
	Platform           string     `json:"platform" binding:"required"`
	PlatformUID        string     `json:"platform_uid" binding:"required"`
	AccountFingerprint *string    `json:"account_fingerprint"`
	DisplayName        string     `json:"display_name" binding:"required"`
	AvatarURL          *string    `json:"avatar_url"`
	Health             string     `json:"health" binding:"required,oneof=live expired captcha risk"`
	VerifiedAt         *time.Time `json:"verified_at"`
	Tags               []string   `json:"tags"`
	IfSyncVersion      *int64     `json:"if_sync_version"`
}

type PatchDesktopAccountRequest struct {
	DisplayName   *string    `json:"display_name"`
	Health        *string    `json:"health" binding:"omitempty,oneof=live expired captcha risk"`
	VerifiedAt    *time.Time `json:"verified_at"`
	Tags          *[]string  `json:"tags"`
	IfSyncVersion int64      `json:"if_sync_version" binding:"required"`
}

type DesktopAccountHealthReportRequest struct {
	AccountID   string     `json:"account_id" binding:"required"`
	Platform    string     `json:"platform" binding:"required"`
	PlatformUID string     `json:"platform_uid" binding:"required"`
	Health      string     `json:"health" binding:"required,oneof=live expired captcha risk"`
	AuthState   string     `json:"auth_state" binding:"required"`
	ProbeState  string     `json:"probe_state" binding:"required"`
	AuthReason  *string    `json:"auth_reason"`
	DisplayName *string    `json:"display_name"`
	AvatarURL   *string    `json:"avatar_url"`
	VerifiedAt  *time.Time `json:"verified_at"`
	CheckedAt   time.Time  `json:"checked_at" binding:"required"`
}

type ReportDesktopAccountHealthRequest struct {
	Reports []DesktopAccountHealthReportRequest `json:"reports" binding:"required,min=1,max=100"`
}

type ReportDesktopAccountHealthResponse struct {
	AcceptedCount int `json:"accepted_count"`
	BufferedCount int `json:"buffered_count"`
}

type bufferedDesktopAccountHealthReport struct {
	TenantID    int64      `json:"tenant_id"`
	WorkspaceID int64      `json:"workspace_id"`
	UserID      int64      `json:"user_id"`
	ClientID    string     `json:"client_id"`
	AccountID   string     `json:"account_id"`
	Platform    string     `json:"platform"`
	PlatformUID string     `json:"platform_uid"`
	Health      string     `json:"health"`
	AuthState   string     `json:"auth_state"`
	ProbeState  string     `json:"probe_state"`
	AuthReason  *string    `json:"auth_reason"`
	DisplayName *string    `json:"display_name"`
	AvatarURL   *string    `json:"avatar_url"`
	VerifiedAt  *time.Time `json:"verified_at"`
	CheckedAt   time.Time  `json:"checked_at"`
	ReceivedAt  time.Time  `json:"received_at"`
}

func (s *DesktopAccountService) ListByClient(ctx context.Context, client *repository.DesktopClient) ([]DesktopAccountView, error) {
	if client == nil {
		return nil, response.ErrUnauthorized(40108, "desktop_client_missing", "desktop client context is required")
	}

	rows, err := s.repo.ListByClient(ctx, client.WorkspaceID, client.ID)
	if err != nil {
		return nil, response.ErrInternal(50081, "desktop_accounts_query_failed", "failed to list desktop accounts")
	}

	clientMap, accountPresenceMap, clientPresenceMap, taskConsumerPresenceMap := s.loadClientState(ctx, client.WorkspaceID, rows)
	items := make([]DesktopAccountView, 0, len(rows))
	for _, item := range rows {
		items = append(items, s.buildDesktopAccountView(&item, clientMap, accountPresenceMap, clientPresenceMap, taskConsumerPresenceMap))
	}
	s.applyRuntimeHealth(ctx, client.WorkspaceID, items)
	s.applyPublishQueueSummaries(ctx, client.WorkspaceID, items)
	return items, nil
}

func (s *DesktopAccountService) ListForActor(ctx context.Context, actor auth.Actor) ([]DesktopAccountView, error) {
	if actor.PrimaryWorkspaceID == 0 || actor.UserID == 0 {
		return nil, response.ErrUnauthorized(40132, "workspace_scope_missing", "workspace context is required")
	}

	rows, err := s.repo.ListByUser(ctx, actor.PrimaryWorkspaceID, actor.UserID)
	if err != nil {
		return nil, response.ErrInternal(50081, "desktop_accounts_query_failed", "failed to list desktop accounts")
	}

	clientMap, accountPresenceMap, clientPresenceMap, taskConsumerPresenceMap := s.loadClientState(ctx, actor.PrimaryWorkspaceID, rows)
	items := make([]DesktopAccountView, 0, len(rows))
	for _, item := range rows {
		items = append(items, s.buildDesktopAccountView(&item, clientMap, accountPresenceMap, clientPresenceMap, taskConsumerPresenceMap))
	}
	s.applyRuntimeHealth(ctx, actor.PrimaryWorkspaceID, items)
	s.applyPublishQueueSummaries(ctx, actor.PrimaryWorkspaceID, items)
	return items, nil
}

func (s *DesktopAccountService) Upsert(ctx context.Context, client *repository.DesktopClient, req UpsertDesktopAccountRequest) (*DesktopAccountView, error) {
	if client == nil {
		return nil, response.ErrUnauthorized(40108, "desktop_client_missing", "desktop client context is required")
	}

	if req.IfSyncVersion != nil {
		existing, err := s.repo.GetByIdentity(ctx, client.WorkspaceID, client.ID, req.Platform, req.PlatformUID)
		if err != nil && !errors.Is(err, pgx.ErrNoRows) {
			return nil, response.ErrInternal(50082, "desktop_account_lookup_failed", "failed to inspect desktop account before upsert")
		}
		if existing == nil || errors.Is(err, pgx.ErrNoRows) {
			return nil, response.ErrConflict(40981, "desktop_account_sync_version_required_existing", "if_sync_version is only valid when account already exists")
		}
	}

	account, err := s.repo.Upsert(ctx, repository.UpsertDesktopAccountParams{
		DesktopID:          uuid.New(),
		TenantID:           client.TenantID,
		WorkspaceID:        client.WorkspaceID,
		UserID:             client.UserID,
		ClientID:           client.ID,
		Platform:           req.Platform,
		PlatformUID:        req.PlatformUID,
		AccountFingerprint: req.AccountFingerprint,
		DisplayName:        req.DisplayName,
		AvatarURL:          req.AvatarURL,
		Health:             req.Health,
		VerifiedAt:         req.VerifiedAt,
		Tags:               req.Tags,
		IfSyncVersion:      req.IfSyncVersion,
	})
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, response.ErrConflict(40982, "desktop_account_sync_conflict", "desktop account sync version conflict")
		}
		appErr := response.ErrInternal(50083, "desktop_account_upsert_failed", "failed to upsert desktop account")
		appErr.Cause = err
		return nil, appErr
	}

	view := s.buildDesktopAccountView(account, nil, nil, nil, nil)
	return &view, nil
}

func (s *DesktopAccountService) ReportHealth(ctx context.Context, client *repository.DesktopClient, req ReportDesktopAccountHealthRequest) (*ReportDesktopAccountHealthResponse, error) {
	if client == nil {
		return nil, response.ErrUnauthorized(40108, "desktop_client_missing", "desktop client context is required")
	}
	if len(req.Reports) == 0 {
		return nil, response.ErrBadRequest(40087, "empty_account_health_reports", "at least one account health report is required")
	}
	if len(req.Reports) > 100 {
		return nil, response.ErrBadRequest(40087, "too_many_account_health_reports", "at most 100 account health reports are allowed")
	}

	accepted := 0
	buffered := 0
	now := s.now().UTC()
	type preparedHealthReport struct {
		accountID uuid.UUID
		latestKey string
		signature string
		payload   []byte
		report    bufferedDesktopAccountHealthReport
	}
	prepared := make([]preparedHealthReport, 0, len(req.Reports))
	for _, item := range req.Reports {
		accountID, err := uuid.Parse(strings.TrimSpace(item.AccountID))
		if err != nil {
			return nil, response.ErrBadRequest(40087, "invalid_account_health_report_account_id", "account_id must be a uuid")
		}
		platform := strings.TrimSpace(item.Platform)
		platformUID := strings.TrimSpace(item.PlatformUID)
		if platform == "" || platformUID == "" {
			return nil, response.ErrBadRequest(40087, "invalid_account_health_report_identity", "platform and platform_uid are required")
		}

		report := bufferedDesktopAccountHealthReport{
			TenantID:    client.TenantID,
			WorkspaceID: client.WorkspaceID,
			UserID:      client.UserID,
			ClientID:    client.ID.String(),
			AccountID:   accountID.String(),
			Platform:    platform,
			PlatformUID: platformUID,
			Health:      item.Health,
			AuthState:   strings.TrimSpace(item.AuthState),
			ProbeState:  strings.TrimSpace(item.ProbeState),
			AuthReason:  trimOptionalString(item.AuthReason),
			DisplayName: trimOptionalString(item.DisplayName),
			AvatarURL:   trimOptionalString(item.AvatarURL),
			VerifiedAt:  item.VerifiedAt,
			CheckedAt:   item.CheckedAt.UTC(),
			ReceivedAt:  now,
		}
		if report.AuthState == "" || report.ProbeState == "" || report.CheckedAt.IsZero() {
			return nil, response.ErrBadRequest(40087, "invalid_account_health_report_state", "auth_state, probe_state and checked_at are required")
		}

		payload, err := json.Marshal(report)
		if err != nil {
			return nil, response.ErrInternal(50087, "account_health_report_encode_failed", "failed to encode account health report")
		}

		latestKey := desktopAccountHealthLatestKey(client.WorkspaceID, accountID)
		prepared = append(prepared, preparedHealthReport{
			accountID: accountID,
			latestKey: latestKey,
			signature: desktopAccountHealthSignature(report),
			payload:   payload,
			report:    report,
		})
		accepted += 1
	}
	changed := make([]preparedHealthReport, 0, len(prepared))
	if s.redis != nil {
		signaturePipe := s.redis.Pipeline()
		signatureCommands := make(map[uuid.UUID]*goredis.StringCmd, len(prepared))
		for _, item := range prepared {
			signatureCommands[item.accountID] = signaturePipe.Get(ctx, item.latestKey+":signature")
		}
		if _, err := signaturePipe.Exec(ctx); err != nil && !errors.Is(err, goredis.Nil) {
			return nil, response.ErrInternal(50087, "account_health_report_cache_failed", "failed to inspect account health report cache")
		}

		pipe := s.redis.Pipeline()
		for _, item := range prepared {
			previousSignature, signatureErr := signatureCommands[item.accountID].Result()
			if signatureErr != nil && !errors.Is(signatureErr, goredis.Nil) {
				return nil, response.ErrInternal(50087, "account_health_report_cache_failed", "failed to inspect account health report cache")
			}

			pipe.Set(ctx, item.latestKey, item.payload, desktopAccountHealthReportTTL)
			if previousSignature != item.signature {
				changed = append(changed, item)
			}
		}
		if _, err := pipe.Exec(ctx); err != nil {
			return nil, response.ErrInternal(50087, "account_health_report_buffer_failed", "failed to buffer account health reports")
		}
	} else {
		changed = append(changed, prepared...)
	}

	if s.rabbitMQ == nil {
		return &ReportDesktopAccountHealthResponse{AcceptedCount: accepted, BufferedCount: 0}, nil
	}

	for _, item := range changed {
		if err := s.rabbitMQ.PublishDesktopAccountHealth(ctx, item.payload); err != nil {
			return nil, response.ErrInternal(50087, "account_health_report_queue_failed", "failed to enqueue account health report")
		}
		buffered += 1
		if s.redis != nil {
			if err := s.redis.Set(ctx, item.latestKey+":signature", item.signature, desktopAccountHealthReportTTL).Err(); err != nil {
				return nil, response.ErrInternal(50087, "account_health_report_signature_failed", "failed to record account health report signature")
			}
		}
	}
	return &ReportDesktopAccountHealthResponse{AcceptedCount: accepted, BufferedCount: buffered}, nil
}

func (s *DesktopAccountService) Patch(ctx context.Context, client *repository.DesktopClient, desktopID uuid.UUID, req PatchDesktopAccountRequest) (*DesktopAccountView, error) {
	if client == nil {
		return nil, response.ErrUnauthorized(40108, "desktop_client_missing", "desktop client context is required")
	}

	account, err := s.repo.Patch(ctx, repository.PatchDesktopAccountParams{
		DesktopID:     desktopID,
		WorkspaceID:   client.WorkspaceID,
		DisplayName:   req.DisplayName,
		Health:        req.Health,
		VerifiedAt:    req.VerifiedAt,
		Tags:          req.Tags,
		IfSyncVersion: req.IfSyncVersion,
		ClientID:      client.ID,
	})
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, response.ErrConflict(40982, "desktop_account_sync_conflict", "desktop account sync version conflict")
		}
		return nil, response.ErrInternal(50084, "desktop_account_patch_failed", "failed to patch desktop account")
	}

	view := s.buildDesktopAccountView(account, nil, nil, nil, nil)
	return &view, nil
}

func (s *DesktopAccountService) Tombstone(ctx context.Context, client *repository.DesktopClient, desktopID uuid.UUID, ifSyncVersion int64) (*DesktopAccountView, error) {
	if client == nil {
		return nil, response.ErrUnauthorized(40108, "desktop_client_missing", "desktop client context is required")
	}

	account, err := s.repo.Tombstone(ctx, desktopID, client.WorkspaceID, client.ID, ifSyncVersion)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, response.ErrConflict(40982, "desktop_account_sync_conflict", "desktop account sync version conflict")
		}
		return nil, response.ErrInternal(50085, "desktop_account_delete_failed", "failed to delete desktop account")
	}

	view := s.buildDesktopAccountView(account, nil, nil, nil, nil)
	invalidateScheduleTaskCaches(ctx, s.cache, client.TenantID, nil)
	return &view, nil
}

func (s *DesktopAccountService) RequestDelete(ctx context.Context, actor auth.Actor, desktopID uuid.UUID, undo bool) (*DesktopAccountView, error) {
	if actor.PrimaryWorkspaceID == 0 || actor.UserID == 0 {
		return nil, response.ErrUnauthorized(40132, "workspace_scope_missing", "workspace context is required")
	}

	var (
		account *repository.DesktopAccount
		err     error
	)

	if undo {
		account, err = s.repo.ClearDeleteRequested(ctx, desktopID, actor.PrimaryWorkspaceID, actor.UserID)
	} else {
		account, err = s.repo.MarkDeleteRequested(ctx, desktopID, actor.PrimaryWorkspaceID, actor.UserID)
	}
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, response.ErrNotFound(40481, "desktop_account_not_found", "desktop account not found")
		}
		return nil, response.ErrInternal(50086, "desktop_account_request_delete_failed", "failed to update desktop account delete request")
	}

	view := s.buildDesktopAccountView(account, nil, nil, nil, nil)
	return &view, nil
}

func (s *DesktopAccountService) DeleteForActor(ctx context.Context, actor auth.Actor, desktopID uuid.UUID) (*DesktopAccountDeleteResult, error) {
	if actor.PrimaryWorkspaceID == 0 || actor.UserID == 0 {
		return nil, response.ErrUnauthorized(40132, "workspace_scope_missing", "workspace context is required")
	}
	if s.pool == nil {
		return nil, response.ErrServiceUnavailable(50342, "desktop_publish_job_store_unavailable", "desktop publish job store is unavailable")
	}

	tx, err := s.pool.Begin(ctx)
	if err != nil {
		return nil, response.ErrInternal(50086, "desktop_account_delete_begin_failed", "failed to start desktop account delete")
	}
	defer tx.Rollback(ctx)

	accountRepo := repository.NewDesktopAccountRepository(tx)
	account, err := accountRepo.TombstoneForActor(ctx, desktopID, actor.PrimaryWorkspaceID, actor.UserID)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			return nil, response.ErrNotFound(40481, "desktop_account_not_found", "desktop account not found")
		}
		return nil, response.ErrInternal(50085, "desktop_account_delete_failed", "failed to delete desktop account")
	}

	cancelled, err := cancelQueuedPublishTasksForDesktopAccountUnbind(ctx, tx, account.TenantID, account.WorkspaceID, account.DesktopID)
	if err != nil {
		return nil, err
	}

	if err := tx.Commit(ctx); err != nil {
		return nil, response.ErrInternal(50086, "desktop_account_delete_commit_failed", "failed to commit desktop account delete")
	}

	view := s.buildDesktopAccountView(account, nil, nil, nil, nil)
	invalidateScheduleTaskCaches(ctx, s.cache, actor.TenantID, nil)
	return &DesktopAccountDeleteResult{
		Account:                      view,
		CancelledQueuedPublishTasks:  cancelled,
		CompletedServerSideUnbinding: true,
	}, nil
}

func desktopAccountHealthLatestKey(workspaceID int64, accountID uuid.UUID) string {
	return fmt.Sprintf("desktop:account-health:latest:%d:%s", workspaceID, accountID.String())
}

func desktopAccountHealthSignature(report bufferedDesktopAccountHealthReport) string {
	payload, _ := json.Marshal(struct {
		AccountID   string  `json:"account_id"`
		Platform    string  `json:"platform"`
		PlatformUID string  `json:"platform_uid"`
		Health      string  `json:"health"`
		AuthState   string  `json:"auth_state"`
		ProbeState  string  `json:"probe_state"`
		AuthReason  *string `json:"auth_reason"`
		DisplayName *string `json:"display_name"`
		AvatarURL   *string `json:"avatar_url"`
	}{
		AccountID:   report.AccountID,
		Platform:    report.Platform,
		PlatformUID: report.PlatformUID,
		Health:      report.Health,
		AuthState:   report.AuthState,
		ProbeState:  report.ProbeState,
		AuthReason:  report.AuthReason,
		DisplayName: report.DisplayName,
		AvatarURL:   report.AvatarURL,
	})
	sum := sha256.Sum256(payload)
	return hex.EncodeToString(sum[:])
}

func trimOptionalString(value *string) *string {
	if value == nil {
		return nil
	}
	trimmed := strings.TrimSpace(*value)
	if trimmed == "" {
		return nil
	}
	return &trimmed
}

func loadDesktopAccountRuntimeHealth(
	ctx context.Context,
	redis *goredis.Client,
	workspaceID int64,
	accountIDs []uuid.UUID,
) map[uuid.UUID]bufferedDesktopAccountHealthReport {
	if redis == nil || len(accountIDs) == 0 {
		return nil
	}

	uniqueIDs := uniqueUUIDs(accountIDs)
	pipe := redis.Pipeline()
	commands := make(map[uuid.UUID]*goredis.StringCmd, len(uniqueIDs))
	for _, accountID := range uniqueIDs {
		commands[accountID] = pipe.Get(ctx, desktopAccountHealthLatestKey(workspaceID, accountID))
	}

	if _, err := pipe.Exec(ctx); err != nil && !errors.Is(err, goredis.Nil) {
		return nil
	}

	result := make(map[uuid.UUID]bufferedDesktopAccountHealthReport, len(commands))
	for accountID, cmd := range commands {
		payload, err := cmd.Bytes()
		if err != nil {
			continue
		}
		var report bufferedDesktopAccountHealthReport
		if err := json.Unmarshal(payload, &report); err != nil {
			continue
		}
		if report.WorkspaceID != workspaceID || report.AccountID != accountID.String() || report.CheckedAt.IsZero() {
			continue
		}
		result[accountID] = report
	}

	return result
}

func (s *DesktopAccountService) applyRuntimeHealth(ctx context.Context, workspaceID int64, items []DesktopAccountView) {
	if s.redis == nil || len(items) == 0 {
		return
	}

	accountIDs := make([]uuid.UUID, 0, len(items))
	accountIndex := make(map[uuid.UUID]int, len(items))
	for index, item := range items {
		accountID, err := uuid.Parse(item.ID)
		if err != nil {
			continue
		}
		accountIDs = append(accountIDs, accountID)
		accountIndex[accountID] = index
	}

	reports := loadDesktopAccountRuntimeHealth(ctx, s.redis, workspaceID, accountIDs)
	for accountID, report := range reports {
		index, ok := accountIndex[accountID]
		if !ok {
			continue
		}
		if !shouldApplyDesktopAccountRuntimeHealth(items[index], report) {
			continue
		}

		health := effectiveDesktopAccountRuntimeHealth(report)
		authState := report.AuthState
		probeState := report.ProbeState
		checkedAt := report.CheckedAt
		items[index].Health = health
		items[index].RuntimeHealth = &health
		items[index].RuntimeVerifiedAt = report.VerifiedAt
		items[index].RuntimeCheckedAt = &checkedAt
		items[index].RuntimeAuthState = &authState
		items[index].RuntimeProbeState = &probeState
		items[index].RuntimeAuthReason = report.AuthReason
		items[index].HealthSource = "runtime"
		if report.VerifiedAt != nil {
			items[index].VerifiedAt = report.VerifiedAt
		}
	}
}

type desktopAccountPublishQueueSummary struct {
	Count    int
	OldestAt *time.Time
}

func (s *DesktopAccountService) applyPublishQueueSummaries(ctx context.Context, workspaceID int64, items []DesktopAccountView) {
	if s == nil || s.pool == nil || len(items) == 0 {
		return
	}

	accountIDs := make([]uuid.UUID, 0, len(items))
	accountIndex := make(map[uuid.UUID]int, len(items))
	for index, item := range items {
		accountID, err := uuid.Parse(item.ID)
		if err != nil {
			continue
		}
		accountIDs = append(accountIDs, accountID)
		accountIndex[accountID] = index
	}
	if len(accountIDs) == 0 {
		return
	}

	summaries, err := s.loadQueuedPublishTaskSummaries(ctx, workspaceID, accountIDs)
	if err != nil {
		return
	}
	for accountID, summary := range summaries {
		index, ok := accountIndex[accountID]
		if !ok {
			continue
		}
		items[index].QueuedPublishTaskCount = summary.Count
		items[index].OldestQueuedPublishTaskAt = summary.OldestAt
	}
}

func (s *DesktopAccountService) loadQueuedPublishTaskSummaries(
	ctx context.Context,
	workspaceID int64,
	accountIDs []uuid.UUID,
) (map[uuid.UUID]desktopAccountPublishQueueSummary, error) {
	if s == nil || s.pool == nil || len(accountIDs) == 0 {
		return nil, nil
	}

	rows, err := s.pool.Query(ctx, `
		SELECT
			dt.target_account_id,
			COUNT(*)::int,
			MIN(COALESCE(dt.enqueued_at, dt.created_at))
		FROM desktop_tasks AS dt
		WHERE dt.workspace_id = $1
		  AND dt.kind = 'publish'
		  AND dt.status = 'queued'
		  AND dt.target_account_id = ANY($2::uuid[])
		  AND dt.attempts < $3
		  AND NOT EXISTS (
			SELECT 1
			FROM desktop_publish_jobs AS j
			WHERE j.desktop_id = dt.job_id
			  AND j.status <> 'queued'
		  )
		GROUP BY dt.target_account_id
	`, workspaceID, uniqueUUIDs(accountIDs), desktopPublishMaxAttempts)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	summaries := make(map[uuid.UUID]desktopAccountPublishQueueSummary)
	for rows.Next() {
		var (
			accountID uuid.UUID
			count     int
			oldestAt  time.Time
		)
		if err := rows.Scan(&accountID, &count, &oldestAt); err != nil {
			return nil, err
		}
		oldestAt = oldestAt.UTC()
		summaries[accountID] = desktopAccountPublishQueueSummary{
			Count:    count,
			OldestAt: &oldestAt,
		}
	}
	if err := rows.Err(); err != nil {
		return nil, err
	}
	return summaries, nil
}

func shouldApplyDesktopAccountRuntimeHealth(item DesktopAccountView, report bufferedDesktopAccountHealthReport) bool {
	if item.VerifiedAt == nil {
		return true
	}
	return !report.CheckedAt.Before(*item.VerifiedAt)
}

func effectiveDesktopAccountRuntimeHealth(report bufferedDesktopAccountHealthReport) string {
	authState := strings.TrimSpace(report.AuthState)
	probeState := strings.TrimSpace(report.ProbeState)
	switch authState {
	case "active":
		return "live"
	case "expiring_soon":
		if probeState != "network_error" {
			return "live"
		}
	}
	return report.Health
}

func (s *DesktopAccountService) buildDesktopAccountView(
	account *repository.DesktopAccount,
	clientMap map[uuid.UUID]*repository.DesktopClient,
	accountPresenceMap map[uuid.UUID]uuid.UUID,
	clientPresenceMap map[uuid.UUID]bool,
	taskConsumerPresenceMap map[uuid.UUID]bool,
) DesktopAccountView {
	var clientID *string
	var clientOnline *bool
	var accountSessionOnline *bool
	var taskConsumerOnline *bool
	var clientLastSeenAt *time.Time
	var clientDeviceName *string

	if account.ClientID != nil {
		value := account.ClientID.String()
		clientID = &value

		clientOnlineValue := false
		clientOnline = &clientOnlineValue
		accountSessionOnlineValue := false
		accountSessionOnline = &accountSessionOnlineValue
		taskConsumerOnlineValue := false
		taskConsumerOnline = &taskConsumerOnlineValue

		if clientMap != nil {
			if client, ok := clientMap[*account.ClientID]; ok && client != nil {
				clientLastSeenAt = client.LastSeenAt
				clientDeviceName = client.DeviceName
				clientOnlineValue = resolveDesktopClientOnline(
					client,
					clientPresenceMap[*account.ClientID],
					clientPresenceMap != nil,
					s.nowUTC(),
				)
			}
		}
		if accountPresenceMap != nil {
			if activeClientID, ok := accountPresenceMap[account.DesktopID]; ok && activeClientID == *account.ClientID {
				accountSessionOnlineValue = true
			}
		}
		if taskConsumerPresenceMap != nil && taskConsumerPresenceMap[*account.ClientID] {
			taskConsumerOnlineValue = true
		}
	}

	return DesktopAccountView{
		ID:                   account.DesktopID.String(),
		Platform:             account.Platform,
		PlatformUID:          normalizePlatformUID(account.PlatformUID),
		DisplayName:          account.DisplayName,
		AvatarURL:            account.AvatarURL,
		Health:               account.Health,
		HealthSource:         "database",
		ClientID:             clientID,
		AccountFingerprint:   account.AccountFingerprint,
		VerifiedAt:           account.VerifiedAt,
		Tags:                 account.Tags,
		SyncVersion:          account.SyncVersion,
		DeletedAt:            account.DeletedAt,
		DeleteRequestedAt:    account.DeleteRequestedAt,
		ClientOnline:         clientOnline,
		AccountSessionOnline: accountSessionOnline,
		TaskConsumerOnline:   taskConsumerOnline,
		ClientLastSeenAt:     clientLastSeenAt,
		ClientDeviceName:     clientDeviceName,
	}
}

func (s *DesktopAccountService) loadClientState(
	ctx context.Context,
	workspaceID int64,
	accounts []repository.DesktopAccount,
) (map[uuid.UUID]*repository.DesktopClient, map[uuid.UUID]uuid.UUID, map[uuid.UUID]bool, map[uuid.UUID]bool) {
	clientIDs := make([]uuid.UUID, 0, len(accounts)*2)
	accountIDs := make([]uuid.UUID, 0, len(accounts))
	seen := make(map[uuid.UUID]struct{}, len(accounts)*2)

	for _, account := range accounts {
		accountIDs = append(accountIDs, account.DesktopID)

		if account.ClientID == nil {
			continue
		}
		if _, ok := seen[*account.ClientID]; ok {
			continue
		}
		seen[*account.ClientID] = struct{}{}
		clientIDs = append(clientIDs, *account.ClientID)
	}

	accountPresenceMap := loadDesktopAccountPresence(ctx, s.redis, accountIDs)
	for _, clientID := range accountPresenceMap {
		if _, ok := seen[clientID]; ok {
			continue
		}
		seen[clientID] = struct{}{}
		clientIDs = append(clientIDs, clientID)
	}

	clientMap := make(map[uuid.UUID]*repository.DesktopClient, len(clientIDs))
	if s.clientRepo != nil {
		for _, clientID := range clientIDs {
			client, err := s.clientRepo.GetByID(ctx, clientID, workspaceID)
			if err != nil {
				if errors.Is(err, pgx.ErrNoRows) {
					continue
				}
				continue
			}
			clientMap[clientID] = client
		}
	}

	clientPresenceMap := loadDesktopClientPresence(ctx, s.redis, clientIDs)
	taskConsumerPresenceMap := loadDesktopTaskConsumerPresence(ctx, s.redis, clientIDs)
	return clientMap, accountPresenceMap, clientPresenceMap, taskConsumerPresenceMap
}

func (s *DesktopAccountService) nowUTC() time.Time {
	if s != nil && s.now != nil {
		return s.now().UTC()
	}
	return time.Now().UTC()
}

func resolveDesktopClientOnline(
	client *repository.DesktopClient,
	presence bool,
	presenceKnown bool,
	now time.Time,
) bool {
	if client == nil || client.RevokedAt != nil {
		return false
	}
	if presenceKnown {
		return presence
	}
	if client.LastSeenAt == nil {
		return false
	}
	return now.UTC().Sub(client.LastSeenAt.UTC()) <= desktopClientPresenceTTL
}

func normalizePlatformUID(value string) string {
	normalized := strings.TrimSpace(value)
	for strings.HasPrefix(strings.ToLower(normalized), "platform:") {
		normalized = strings.TrimSpace(normalized[len("platform:"):])
	}
	return normalized
}