package dbsync

import (
	"context"
	"database/sql"
	"time"
)

const (
	EntryDrain     = "drain"
	EntryAgentPush = "agent_push"
	EntryRollback  = "rollback"
	OutcomeApplied = "applied_source"
	OutcomeKept    = "kept_target"
	OutcomeRolled  = "rolled_back"
)

// RecordLwwOverride 在 LWW 覆盖或保留目标时写入超管审计（失败忽略，不挡同步）。
func RecordLwwOverride(store *FileStore, o LwwOverride) {
	if store == nil {
		return
	}
	_ = store.AddLwwOverride(o)
}

// SnapshotTargetRow 取目标端当前行 JSON（无行则空串）。
func SnapshotTargetRow(ctx context.Context, db *sql.DB, driver Driver, table, pkCol, rowPK string) string {
	if db == nil || rowPK == "" {
		return ""
	}
	js, _, err := FetchRowJSON(ctx, db, driver, table, pkCol, rowPK)
	if err != nil {
		return ""
	}
	return js
}

// DefaultLwwAuditTTL 默认 90 天。
func DefaultLwwAuditTTL() time.Duration {
	return 90 * 24 * time.Hour
}