// SPDX-License-Identifier: MIT
// Copyright (c) 2026 Thibault Ducray
//
// This file is part of MyPwdTool's open-source sync/encryption core — see
// LICENSE-SYNC-CRYPTO.md at the repo root and https://tducray.fr/mypwdtool/open-source/.
// The rest of this application is proprietary and NOT covered by this license.

package fr.tducray.mypwdtool.sync

import fr.tducray.mypwdtool.vault.Entry
import java.util.UUID

/**
 * Port of `Sync/SyncOutbox.swift` — a trivial in-memory FIFO, deliberately not persisted (the
 * local vault DB is the source of truth; a lost item just gets requeued next time that entry
 * changes, or picked up by a future bulk sync).
 */
class SyncOutbox {
    data class Item(val op: SyncOp, val entryId: UUID, val updatedAt: String, val entry: Entry?)

    private val lock = Object()
    private val items = mutableListOf<Item>()

    fun enqueue(item: Item) {
        synchronized(lock) { items.add(item) }
    }

    fun drain(): List<Item> = synchronized(lock) {
        val drained = items.toList()
        items.clear()
        drained
    }
}