// 즐겨찾기 관리자 화면 (Chrome 의 chrome://bookmarks 참고) - bookmark_ui.dart 에서 나눔.
// 약속:
//  - 입력: 즐겨찾기 [BookmarksController] · 열기 콜백 ([onOpen] · [onOpenExternal]) · 지금 페이지 주소 · 제목 · 처음 열 폴더.
//  - 출력: 왼쪽 폴더 나무 · 오른쪽 내용 · 검색 결과. 바꾸기 (추가 · 수정 · 삭제 · 옮기기 · 순서) 는 모두 [BookmarksController] 로,
//          HTML 내보내기 · 가져오기 · 다른 브라우저에서 가져오기 결과는 알림 한 줄.
//  - 오류: 가져올 것이 없거나 파일을 찾지 못하면 알림 글로만 (던지지 않음). 고른 폴더가 없어지면 즐겨찾기 줄로 돌아간다.
// 대화 상자 · 메뉴 · 끌기 조각은 bookmark_ui.dart 의 것을 부른다.
import 'dart:convert';
import 'dart:typed_data';

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

import '../app/bookmarks_controller.dart';
import '../core/bookmarks.dart';
import '../l10n/tr.dart';
import 'app_actions.dart';
import 'bookmark_ui.dart';
import 'theme.dart';

class BookmarkManagerPage extends StatefulWidget {
  final BookmarksController bm;
  final void Function(String url) onOpen;
  final void Function(String url)? onOpenExternal;
  final String currentUrl;
  final String currentTitle;
  final String? initialFolderId;

  const BookmarkManagerPage({
    super.key,
    required this.bm,
    required this.onOpen,
    this.onOpenExternal,
    this.currentUrl = '',
    this.currentTitle = '',
    this.initialFolderId,
  });

  @override
  State<BookmarkManagerPage> createState() => _BookmarkManagerPageState();
}

class _BookmarkManagerPageState extends State<BookmarkManagerPage> {
  late String _folder = widget.initialFolderId ?? BookmarkTree.barId;
  final _search = TextEditingController();
  final Set<String> _collapsed = {};

  BookmarksController get bm => widget.bm;

  @override
  void dispose() {
    _search.dispose();
    super.dispose();
  }

  void _open(String url) {
    widget.onOpen(url);
    Navigator.maybePop(context);
  }

  Future<void> _export() async {
    final uri = await FilePicker.saveFile(
      dialogTitle: tr('즐겨찾기 내보내기 (HTML)'),
      fileName: tr('JJ_MKVMaker_즐겨찾기.html'),
      bytes: Uint8List.fromList(utf8.encode(bm.tree.toNetscapeHtml())),
      type: FileType.custom,
      allowedExtensions: const ['html'],
    );
    if (uri == null) return;
    final file = uri.scheme == 'file' ? uri.toFilePath() : uri.toString();
    await bm.exportHtml(file);
    if (mounted) {
      ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(trf('내보냈습니다: {0}', [file]))));
    }
  }

  Future<void> _importHtml() async {
    final r = await FilePicker.pickFiles(
        dialogTitle: tr('즐겨찾기 HTML 가져오기'), type: FileType.custom, allowedExtensions: const ['html', 'htm']);
    final path = r.isEmpty ? null : r.single.path;
    if (path == null) return;
    final n = await bm.importHtml(path);
    if (!mounted) return;
    ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text(n > 0 ? trf('{0}개를 "기타 즐겨찾기" 에 가져왔습니다.', [n]) : tr('가져올 즐겨찾기가 없습니다.'))));
    if (n > 0) setState(() => _folder = BookmarkTree.otherId);
  }

  Future<void> _importBrowser(String b) async {
    final n = await bm.importFrom(b);
    if (!mounted) return;
    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
        content: Text(n < 0 ? tr('이 브라우저의 즐겨찾기 파일을 찾지 못했습니다.') : trf('{0}개를 "기타 즐겨찾기" 에 가져왔습니다.', [n]))));
    if (n > 0) setState(() => _folder = BookmarkTree.otherId);
  }

  @override
  Widget build(BuildContext context) => ListenableBuilder(
        listenable: bm,
        builder: (context, _) {
          if (bm.tree.find(_folder) == null) _folder = BookmarkTree.barId;
          final q = _search.text.trim();
          return Scaffold(
            body: Column(children: [
              _topBar(),
              const Divider(height: 1),
              Expanded(
                child: Row(crossAxisAlignment: CrossAxisAlignment.stretch, children: [
                  SizedBox(width: 280, child: _tree()),
                  const VerticalDivider(width: 1),
                  Expanded(child: q.isEmpty ? _contents() : _results(q)),
                ]),
              ),
            ]),
          );
        },
      );

  Widget _topBar() => AppTopBar(
        nav: const AppNavButtons(),
        actions: const AppActions(),
        middle: Row(children: [
          Icon(Icons.bookmarks_outlined, color: JjColors.accent),
          const SizedBox(width: 8),
          if (!isCompact(context)) ...[
            Text(tr('즐겨찾기 관리자'), style: TextStyle(fontSize: 16, fontWeight: FontWeight.w600)),
            const SizedBox(width: 24),
          ],
          Expanded(
            child: TextField(
              controller: _search,
              style: const TextStyle(fontSize: 13),
              decoration: InputDecoration(
                isDense: true,
                filled: true,
                fillColor: JjColors.bg,
                hintText: tr('즐겨찾기 검색 (이름 · 주소)'),
                prefixIcon: const Icon(Icons.search, size: 18),
                suffixIcon: _search.text.isEmpty
                    ? null
                    : IconButton(
                        tooltip: tr('검색 지우기'),
                        icon: const Icon(Icons.close, size: 16),
                        onPressed: () => setState(_search.clear)),
                border: OutlineInputBorder(borderRadius: BorderRadius.circular(18), borderSide: BorderSide.none),
              ),
              onChanged: (_) => setState(() {}),
            ),
          ),
          const SizedBox(width: 8),
          PopupMenuButton<String>(
            tooltip: tr('관리 메뉴'),
            icon: const Icon(Icons.more_vert),
            itemBuilder: (_) => [
              PopupMenuItem(value: 'link', child: Text(tr('새 즐겨찾기 추가'))),
              PopupMenuItem(value: 'folder', child: Text(tr('새 폴더 추가'))),
              PopupMenuDivider(),
              PopupMenuItem(value: 'chrome', child: Text(tr('Chrome 에서 가져오기'))),
              PopupMenuItem(value: 'edge', child: Text(tr('Edge 에서 가져오기'))),
              PopupMenuItem(value: 'whale', child: Text(tr('Whale 에서 가져오기'))),
              PopupMenuItem(value: 'html', child: Text(tr('HTML 파일에서 가져오기'))),
              PopupMenuDivider(),
              PopupMenuItem(value: 'export', child: Text(tr('HTML 파일로 내보내기'))),
            ],
            onSelected: (v) async {
              switch (v) {
                case 'link':
                  await showNewBookmarkDialog(context, bm, _folder, title: widget.currentTitle, url: widget.currentUrl);
                case 'folder':
                  await showNewFolderDialog(context, bm, _folder);
                case 'chrome' || 'edge' || 'whale':
                  await _importBrowser(v);
                case 'html':
                  await _importHtml();
                case 'export':
                  await _export();
              }
            },
          ),
        ]),
      );

  // 왼쪽: 폴더 나무 (누르면 오른쪽에 내용, 즐겨찾기를 끌어다 놓으면 그 폴더로)
  Widget _tree() {
    final rows = <Widget>[];
    void walk(BookmarkNode f, int depth) {
      final subs = f.children!.where((c) => c.isFolder).toList();
      final open = !_collapsed.contains(f.id);
      final selected = f.id == _folder;
      void folderMenu(Offset at) => showBookmarkMenu(context,
          bm: bm,
          globalPosition: at,
          n: f,
          folderId: f.id,
          onOpen: _open,
          currentUrl: widget.currentUrl,
          currentTitle: widget.currentTitle);
      final row = BookmarkFolderDrop(
        bm: bm,
        folderId: f.id,
        // 터치 화면: 길게 누르면 오른쪽 클릭과 같은 메뉴
        child: GestureDetector(
          onLongPressStart: depth == 0 ? (d) => folderMenu(d.globalPosition) : null,
          child: InkWell(
          onTap: () => setState(() {
            _folder = f.id;
            _search.clear();
          }),
          onSecondaryTapDown: (d) => folderMenu(d.globalPosition),
          child: Container(
            color: selected ? JjColors.accent.withValues(alpha: 0.16) : null,
            padding: EdgeInsets.only(left: 6 + depth * 16.0, right: 8, top: 6, bottom: 6),
            child: Row(children: [
              SizedBox(
                width: 22,
                child: subs.isEmpty
                    ? null
                    : InkWell(
                        onTap: () => setState(() => open ? _collapsed.add(f.id) : _collapsed.remove(f.id)),
                        child: Icon(open ? Icons.expand_more : Icons.chevron_right, size: 18),
                      ),
              ),
              Icon(depth == 0 ? Icons.folder_special : (selected ? Icons.folder_open : Icons.folder),
                  size: 18, color: JjColors.amber),
              const SizedBox(width: 8),
              Expanded(child: Text(f.title, maxLines: 1, overflow: TextOverflow.ellipsis)),
            ]),
          ),
        ),
        ),
      );
      rows.add(depth == 0 ? row : BookmarkDraggable(n: f, onMenu: folderMenu, child: row));
      if (open) {
        for (final s in subs) {
          walk(s, depth + 1);
        }
      }
    }

    for (final r in bm.tree.roots) {
      walk(r, 0);
    }
    return Material(color: JjColors.panel, child: ListView(children: rows));
  }

  // 오른쪽: 고른 폴더의 내용 (끌어서 순서 바꾸기, 폴더 위로 끌면 그 안으로, 오른쪽 클릭 메뉴)
  Widget _contents() {
    final folder = bm.tree.find(_folder)!;
    final items = folder.children!;
    final path = bm.tree.pathTo(folder.id);
    return Column(crossAxisAlignment: CrossAxisAlignment.stretch, children: [
      Padding(
        padding: const EdgeInsets.fromLTRB(16, 10, 12, 6),
        child: Row(children: [
          Expanded(
            child: Wrap(crossAxisAlignment: WrapCrossAlignment.center, children: [
              for (final (i, f) in path.indexed) ...[
                if (i > 0) Icon(Icons.chevron_right, size: 16, color: JjColors.textDim),
                BookmarkFolderDrop(
                  bm: bm,
                  folderId: f.id,
                  child: InkWell(
                    onTap: () => setState(() => _folder = f.id),
                    child: Padding(
                      padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
                      child: Text(f.title,
                          style: TextStyle(
                              fontSize: 14,
                              fontWeight: f.id == folder.id ? FontWeight.w600 : FontWeight.normal,
                              color: f.id == folder.id ? JjColors.text : JjColors.accent)),
                    ),
                  ),
                ),
              ],
            ]),
          ),
          OutlinedButton.icon(
            onPressed: () => showNewBookmarkDialog(context, bm, folder.id,
                title: widget.currentTitle, url: widget.currentUrl),
            icon: const Icon(Icons.add_link, size: 18),
            label: Text(tr('즐겨찾기 추가')),
          ),
          const SizedBox(width: 8),
          OutlinedButton.icon(
            onPressed: () => showNewFolderDialog(context, bm, folder.id),
            icon: const Icon(Icons.create_new_folder_outlined, size: 18),
            label: Text(tr('새 폴더')),
          ),
        ]),
      ),
      const Divider(height: 1),
      Expanded(
        child: items.isEmpty
            ? Center(
                child: Text(tr('비어 있는 폴더입니다.\n위의 [즐겨찾기 추가] · [새 폴더] 를 누르거나, 즐겨찾기를 왼쪽 폴더로 끌어다 놓으세요.'),
                    textAlign: TextAlign.center, style: TextStyle(color: JjColors.textDim)))
            : ReorderableListView.builder(
                buildDefaultDragHandles: false,
                itemCount: items.length,
                onReorderItem: (o, n) => bm.reorder(folder.id, o, n),
                itemBuilder: (_, i) => _row(items[i], i, folder),
              ),
      ),
      Padding(
        padding: EdgeInsets.all(8),
        child: Text(tr('왼쪽 손잡이로 순서 바꾸기 · 아이콘을 끌어 왼쪽 폴더나 목록의 폴더 위에 놓으면 그 폴더로 이동 · 오른쪽 클릭 메뉴'),
            textAlign: TextAlign.center, style: TextStyle(fontSize: 11, color: JjColors.textDim)),
      ),
    ]);
  }

  Widget _row(BookmarkNode n, int i, BookmarkNode folder) {
    final tile = ListTile(
      dense: true,
      leading: Row(mainAxisSize: MainAxisSize.min, children: [
        ReorderableDragStartListener(
          index: i,
          child: Icon(Icons.drag_indicator, size: 18, color: JjColors.textDim),
        ),
        const SizedBox(width: 6),
        // 아이콘을 끌면 다른 폴더로 옮기기
        BookmarkDraggable(
          n: n,
          onMenu: (at) => _menu(n, folder, at),
          child: Icon(n.isFolder ? Icons.folder : Icons.public, size: 20, color: n.isFolder ? JjColors.amber : JjColors.textDim),
        ),
      ]),
      title: Text(n.title, maxLines: 1, overflow: TextOverflow.ellipsis),
      subtitle: Text(n.isFolder ? trf('{0}개 · 주소 {1}개', [n.children!.length, bm.tree.countLinks(n)]) : n.url!,
          maxLines: 1, overflow: TextOverflow.ellipsis, style: const TextStyle(fontSize: 11)),
      onTap: () => n.isFolder ? setState(() => _folder = n.id) : _open(n.url!),
      trailing: IconButton(
        tooltip: tr('더 보기'),
        icon: const Icon(Icons.more_vert, size: 18),
        onPressed: () {
          final box = context.findRenderObject() as RenderBox?;
          final pos = box == null ? Offset.zero : box.localToGlobal(box.size.topRight(Offset.zero));
          _menu(n, folder, pos);
        },
      ),
    );
    final row = GestureDetector(
      onSecondaryTapDown: (d) => _menu(n, folder, d.globalPosition),
      child: n.isFolder ? BookmarkFolderDrop(bm: bm, folderId: n.id, child: tile) : tile,
    );
    return KeyedSubtree(key: ValueKey(n.id), child: row);
  }

  void _menu(BookmarkNode n, BookmarkNode folder, Offset pos) => showBookmarkMenu(context,
      bm: bm,
      globalPosition: pos,
      n: n,
      folderId: folder.id,
      onOpen: _open,
      onOpenExternal: widget.onOpenExternal,
      currentUrl: widget.currentUrl,
      currentTitle: widget.currentTitle);

  // 검색 결과 (위치 = 들어 있는 폴더)
  Widget _results(String q) {
    final found = bm.tree.search(q);
    if (found.isEmpty) return Center(child: Text(tr('찾는 즐겨찾기가 없습니다.'), style: TextStyle(color: JjColors.textDim)));
    return ListView(children: [
      Padding(
        padding: const EdgeInsets.fromLTRB(16, 10, 16, 6),
        child: Text(trf('"{0}" 검색 결과 {1}개', [q, found.length]), style: const TextStyle(fontWeight: FontWeight.w600)),
      ),
      for (final n in found)
        GestureDetector(
          onSecondaryTapDown: (d) => _menu(n, bm.tree.parentOf(n.id) ?? bm.tree.bar, d.globalPosition),
          child: ListTile(
            dense: true,
            leading: BookmarkDraggable(
              n: n,
              onMenu: (at) => _menu(n, bm.tree.parentOf(n.id) ?? bm.tree.bar, at),
              child: Icon(n.isFolder ? Icons.folder : Icons.public, size: 20, color: n.isFolder ? JjColors.amber : JjColors.textDim),
            ),
            title: Text(n.title, maxLines: 1, overflow: TextOverflow.ellipsis),
            subtitle: Text(
                '${bm.tree.pathTo(n.id).reversed.skip(1).toList().reversed.map((f) => f.title).join(' › ')}'
                '${n.isFolder ? '' : '  ·  ${n.url}'}',
                maxLines: 1,
                overflow: TextOverflow.ellipsis,
                style: const TextStyle(fontSize: 11)),
            onTap: () => n.isFolder
                ? setState(() {
                    _folder = n.id;
                    _search.clear();
                  })
                : _open(n.url!),
          ),
        ),
    ]);
  }
}