import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';

import '../core/file_ops.dart';
import '../core/vfs.dart';
import '../l10n/tr.dart';
import 'theme.dart';

/// 82: 창 사이 끌어 놓기로 옮기는 것 - 어느 창 ([from], 창 번호) 의 어떤 항목들
class DragLoad {
  final int from;
  final List<String> paths;
  const DragLoad(this.from, this.paths);
}

/// 82: [load] 를 [to] 창의 [dest] 폴더에 놓을 수 있는지 - 같은 창 · 자기 안 · 원본 폴더 자신은 안 됨
bool canDropInto(DragLoad load, int to, String dest) {
  if (load.from == to || load.paths.isEmpty) return false;
  if (load.paths.any((x) => isSameOrInside(dest, x))) return false;
  if (load.paths.every((x) => samePath(vDirname(x), dest))) return false;
  return true;
}

/// 82: 마우스로 [slop] (8px) 넘게 움직였을 때만 끌기 - 한 번 누르기 (고르기) · 두 번 누르기 (열기) 가 흔들리지 않게
class MouseDraggable<T extends Object> extends Draggable<T> {
  final double slop;
  const MouseDraggable({
    super.key,
    required super.child,
    required super.feedback,
    super.data,
    super.childWhenDragging,
    super.onDragStarted,
    super.onDragEnd,
    this.slop = 8,
  });

  @override
  MultiDragGestureRecognizer createRecognizer(GestureMultiDragStartCallback onStart) =>
      _SlopMultiDrag(slop, supportedDevices: const {PointerDeviceKind.mouse})..onStart = onStart;
}

class _SlopMultiDrag extends MultiDragGestureRecognizer {
  final double slop;
  _SlopMultiDrag(this.slop, {super.supportedDevices}) : super(debugOwner: null);

  @override
  MultiDragPointerState createNewPointerState(PointerDownEvent event) => _SlopState(slop, event.position, event.kind, gestureSettings);

  @override
  String get debugDescription => 'explorer drag';
}

class _SlopState extends MultiDragPointerState {
  final double slop;
  _SlopState(this.slop, super.initialPosition, super.kind, super.gestureSettings);

  @override
  void checkForResolutionAfterMove() {
    if (pendingDelta!.distance > slop) resolve(GestureDisposition.accepted);
  }

  @override
  void accepted(GestureMultiDragStartCallback starter) => starter(initialPosition);
}

/// 82: 끄는 동안 손가락 · 마우스 옆에 보이는 것: "n개 · 첫 이름"
Widget dragFeedback(List<String> paths) => Material(
      color: Colors.transparent,
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 6),
        decoration: BoxDecoration(
          color: JjColors.panelHigh,
          borderRadius: BorderRadius.circular(6),
          border: Border.all(color: JjColors.accent),
        ),
        child: Row(mainAxisSize: MainAxisSize.min, children: [
          const Icon(Icons.drive_file_move_outline, size: 16, color: JjColors.accent),
          const SizedBox(width: 6),
          Text(paths.length == 1 ? vBasename(paths.first) : trf('{0}개 · {1} …', [paths.length, vBasename(paths.first)]),
              style: const TextStyle(fontSize: 12, color: JjColors.text)),
        ]),
      ),
    );

/// 82: 놓았을 때 묻기 - 복사 (Enter, 처음 고름) · 이동 · 취소. 취소하면 null
Future<bool?> askDropAction(BuildContext context, List<String> paths, String dest) => showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        scrollable: true,
        title: Text(trf('{0}개 항목을 놓았습니다', [paths.length])),
        content: Text('${vDisplay(dest)}\n${paths.take(5).map(vBasename).join(', ')}${paths.length > 5 ? ' …' : ''}'),
        actions: [
          TextButton(onPressed: () => Navigator.pop(ctx), child: Text(tr('취소'))),
          OutlinedButton(onPressed: () => Navigator.pop(ctx, true), child: Text(tr('이동'))),
          FilledButton(autofocus: true, onPressed: () => Navigator.pop(ctx, false), child: Text(tr('복사'))),
        ],
      ),
    );