#!/usr/bin/env python3
"""Replace SwiftUI Transferable drag/drop with NSItemProvider drag/drop for Settings servers."""
from pathlib import Path
from datetime import datetime
import shutil

root = Path.cwd()
file = root / 'OrionToolbar/SettingsView.swift'
if not file.is_file():
    raise SystemExit('Run from /Volumes/Developer/Applications/OrionToolbar')
s = file.read_text()
old = '''                        .draggable(server.id.uuidString)
                        .dropDestination(for: String.self) { values, _ in
                            guard let first = values.first,
                                  let dragged = UUID(uuidString: first),
                                  dragged != server.id else { return false }
                            vm.reorderServer(draggedID: dragged, onto: server.id)
                            return true
                        }'''
new = '''                        // Native macOS drag source. Works in the menu-bar Settings window.
                        .onDrag {
                            NSItemProvider(object: server.id.uuidString as NSString)
                        }
                        .onDrop(of: [UTType.utf8PlainText.identifier, UTType.plainText.identifier], isTargeted: nil) { providers in
                            guard let provider = providers.first(where: {
                                $0.canLoadObject(ofClass: NSString.self)
                            }) else { return false }
                            let targetID = server.id
                            _ = provider.loadObject(ofClass: NSString.self) { object, _ in
                                guard let raw = object as? String,
                                      let draggedID = UUID(uuidString: raw) else { return }
                                Task { @MainActor in
                                    vm.reorderServer(draggedID: draggedID, onto: targetID)
                                }
                            }
                            return true
                        }'''
if old not in s:
    raise SystemExit('Expected V3 Settings drag/drop block not found. No changes made; show current SettingsView.swift.')
if 'import UniformTypeIdentifiers' not in s:
    s = s.replace('import SwiftUI', 'import SwiftUI\nimport UniformTypeIdentifiers', 1)
s = s.replace(old, new, 1)
backup = root / 'backups' / datetime.now().strftime('%Y%m%d-%H%M%S-%f') / 'OrionToolbar' / 'SettingsView.swift'
backup.parent.mkdir(parents=True, exist_ok=True)
shutil.copy2(file, backup)
file.write_text(s)
print('Updated:', file)
print('Backup:', backup)
print('Drag a server row onto another server row in Settings.')