//
//  DraggedItem.swift
//  Confab
//
//  Drag-and-drop payload wire format for the conversation lists
//
// SPDX-License-Identifier: PolyForm-Noncommercial-1.0.0
// Copyright (C) 2026 Rune Olsen
//
// This file is part of Confab.
//
// Confab is licensed under the PolyForm Noncommercial License 1.0.0.
// You may use, study, modify, and share it for any noncommercial
// purpose. Commercial use — including selling Confab or any part of
// it, standalone or bundled into another product or service —
// requires a separate commercial license from the copyright holder.
//
// See the LICENSE file or
// <https://polyformproject.org/licenses/noncommercial/1.0.0> for
// the full license text. For commercial licensing, contact Rune
// Olsen via <https://confab.no>.

import Foundation

/// Disambiguates what's being dragged in the sidebar/advanced-list conversation trees, now that
/// both conversations and folders are draggable. `.conversations` carries one or more IDs — a
/// single drag, or every ID in an active multi-selection bundled together so dropping any one of
/// them moves the whole selection.
enum DraggedItem: Equatable {
    case conversations([UUID])
    case folder(UUID)

    var rawValue: String {
        switch self {
        case .conversations(let ids): return "conversation:" + ids.map(\.uuidString).joined(separator: ",")
        case .folder(let id): return "folder:\(id.uuidString)"
        }
    }

    init?(rawValue: String) {
        if rawValue.hasPrefix("conversation:") {
            let ids = rawValue.dropFirst(13).split(separator: ",").compactMap { UUID(uuidString: String($0)) }
            guard !ids.isEmpty else { return nil }
            self = .conversations(ids)
        } else if rawValue.hasPrefix("folder:"), let id = UUID(uuidString: String(rawValue.dropFirst(7))) {
            self = .folder(id)
        } else {
            return nil
        }
    }
}