import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:tdesign_flutter/tdesign_flutter.dart';
import '../shell/nav_bar_config.dart';
import '../../core/utils/responsive.dart';
import '../../shared/widgets/action_bar.dart';
import '../../shared/widgets/form_section.dart';
import '../../core/i18n/app_localizations.dart';
import '../../core/theme/app_colors_extension.dart';

class AnnouncementCreatePage extends ConsumerStatefulWidget {
  const AnnouncementCreatePage({super.key});
  @override
  ConsumerState<AnnouncementCreatePage> createState() =>
      _AnnouncementCreatePageState();
}

class _AnnouncementCreatePageState
    extends ConsumerState<AnnouncementCreatePage> {
  final _titleCtrl = TextEditingController();
  final _contentCtrl = TextEditingController();
  String _type = '通知公告';
  bool _isTop = false;
  DateTime? _expiryDate;

  // 接收范围
  int _scopeMode = 0; // 0=全员, 1=按部门, 2=按指定用户
  final List<String> _selectedDepts = [];
  final List<String> _selectedUsers = [];
  final int _totalCoverage = 128; // 模拟覆盖人数

  // 附件模拟
  final List<String> _attachments = [];
  static const int _maxAttachments = 5;

  final _types = ['通知公告', '人事与制度', '放假与活动'];
  final List<String> _mockDepts = [
    '市场部',
    '技术部',
    '销售部',
    '财务部',
    '人力资源部',
    '行政管理部',
  ];

  @override
  void dispose() {
    _titleCtrl.dispose();
    _contentCtrl.dispose();
    super.dispose();
  }

  Future<void> _pickType() async {
    final l10n = AppLocalizations.of(context);
    final result = await showDialog<String>(
      context: context,
      builder: (ctx) => TDAlertDialog.vertical(
        title: l10n.get('announcementTypes'),
        buttons: _types
            .map(
              (t) => TDDialogButtonOptions(
                title: t,
                action: () => Navigator.pop(ctx, t),
              ),
            )
            .toList(),
      ),
    );
    if (result != null) setState(() => _type = result);
  }

  void _pickExpiryDate() {
    final l10n = AppLocalizations.of(context);
    final initial = _expiryDate ?? DateTime.now().add(const Duration(days: 30));
    TDPicker.showDatePicker(
      context,
      title: l10n.get('selectExpiryDate'),
      useYear: true,
      useMonth: true,
      useDay: true,
      useHour: false,
      useMinute: false,
      initialDate: [initial.year, initial.month, initial.day],
      onConfirm: (selected) {
        setState(() {
          _expiryDate = DateTime(
            selected['year'] ?? initial.year,
            selected['month'] ?? initial.month,
            selected['day'] ?? initial.day,
          );
        });
      },
    );
  }

  void _showScopeDrawer() {
    showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(12)),
      ),
      builder: (ctx) => _buildScopeDrawerContent(ctx),
    );
  }

  Widget _buildScopeDrawerContent(BuildContext ctx) {
    final l10n = AppLocalizations.of(ctx);
    return StatefulBuilder(
      builder: (context, setInnerState) {
        final colors = Theme.of(context).extension<AppColorsExtension>()!;
        return Container(
          height: MediaQuery.of(context).size.height * 0.7,
          padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Text(
                    l10n.get('recipientScope'),
                    style: TextStyle(
                      fontSize: 16,
                      fontWeight: FontWeight.w600,
                      color: colors.textPrimary,
                    ),
                  ),
                  GestureDetector(
                    onTap: () => Navigator.pop(context),
                    child: const Icon(Icons.close, size: 20),
                  ),
                ],
              ),
              const SizedBox(height: 16),

              RadioGroup<int>(
                groupValue: _scopeMode,
                onChanged: (v) {
                  setInnerState(() => _scopeMode = v!);
                  setState(() {});
                },
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    _buildScopeOption(
                      context,
                      l10n.get('allStaff'),
                      l10n.get('scopeAllStaff'),
                      0,
                      setInnerState,
                    ),
                    const SizedBox(height: 8),
                    _buildScopeOption(
                      context,
                      l10n.get('byDept'),
                      l10n.get('byDeptHint'),
                      1,
                      setInnerState,
                    ),
                    const SizedBox(height: 8),
                    _buildScopeOption(
                      context,
                      l10n.get('byUser'),
                      l10n.get('byUserHint'),
                      2,
                      setInnerState,
                    ),
                  ],
                ),
              ),

              if (_scopeMode == 1) ...[
                const SizedBox(height: 12),
                Text(
                  l10n.get('selectDept'),
                  style: TextStyle(fontSize: 13, color: colors.textSecondary),
                ),
                const SizedBox(height: 4),
                ..._mockDepts.map(
                  (dept) => CheckboxListTile(
                    title: Text(dept, style: const TextStyle(fontSize: 14)),
                    value: _selectedDepts.contains(dept),
                    onChanged: (checked) {
                      setInnerState(() {
                        if (checked == true) {
                          _selectedDepts.add(dept);
                        } else {
                          _selectedDepts.remove(dept);
                        }
                      });
                      setState(() {});
                    },
                    dense: true,
                    contentPadding: EdgeInsets.zero,
                  ),
                ),
              ],

              if (_scopeMode == 2) ...[
                const SizedBox(height: 12),
                Text(
                  l10n.get('searchEmployee'),
                  style: TextStyle(fontSize: 13, color: colors.textSecondary),
                ),
                const SizedBox(height: 4),
                Container(
                  padding: const EdgeInsets.symmetric(
                    horizontal: 10,
                    vertical: 2,
                  ),
                  decoration: BoxDecoration(
                    color: colors.bgPage,
                    borderRadius: BorderRadius.circular(4),
                  ),
                  child: TDInput(hintText: l10n.get('searchEmployeeHint')),
                ),
                const SizedBox(height: 8),
                Text(
                  l10n.getString('selectedCount', args: {'count': '${_selectedUsers.length}'}),
                  style: TextStyle(fontSize: 12, color: colors.textSecondary),
                ),
              ],

              const Spacer(),

              // 覆盖统计
              Container(
                padding: const EdgeInsets.all(12),
                decoration: BoxDecoration(
                  color: colors.primaryLight,
                  borderRadius: BorderRadius.circular(8),
                ),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Text(
                      l10n.get('coverageCount'),
                      style: TextStyle(fontSize: 14, color: colors.textPrimary),
                    ),
                    Text(
                      '${_scopeMode == 0 ? _totalCoverage : (_scopeMode == 1 ? _selectedDepts.length * 15 : _selectedUsers.length)} ${l10n.get('personUnit')}',
                      style: TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.w700,
                        color: colors.primary,
                      ),
                    ),
                  ],
                ),
              ),
              const SizedBox(height: 12),
              SizedBox(
                width: double.infinity,
                child: TDButton(
                  text: l10n.get('confirm'),
                  size: TDButtonSize.large,
                  theme: TDButtonTheme.primary,
                  isBlock: true,
                  onTap: () => Navigator.pop(context),
                ),
              ),
            ],
          ),
        );
      },
    );
  }

  Widget _buildScopeOption(
    BuildContext context,
    String title,
    String subtitle,
    int mode,
    void Function(void Function()) setInnerState,
  ) {
    final colors = Theme.of(context).extension<AppColorsExtension>()!;
    final selected = _scopeMode == mode;
    return GestureDetector(
      onTap: () {
        setInnerState(() => _scopeMode = mode);
        setState(() {});
      },
      child: Container(
        padding: const EdgeInsets.all(12),
        decoration: BoxDecoration(
          color: selected ? colors.primaryLight : colors.bgPage,
          borderRadius: BorderRadius.circular(8),
          border: Border.all(
            color: selected ? colors.primary : Colors.transparent,
          ),
        ),
        child: Row(
          children: [
            Radio<int>(value: mode, activeColor: colors.primary),
            const SizedBox(width: 8),
            Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  title,
                  style: TextStyle(fontSize: 14, color: colors.textPrimary),
                ),
                Text(
                  subtitle,
                  style: TextStyle(fontSize: 12, color: colors.textSecondary),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }

  void _showPreview() {
    final colors = Theme.of(context).extension<AppColorsExtension>()!;
    final l10n = AppLocalizations.of(context);
    showDialog(
      context: context,
      barrierDismissible: true,
      builder: (ctx) => Dialog(
        insetPadding: const EdgeInsets.all(16),
        child: Container(
          width: double.infinity,
          height: MediaQuery.of(context).size.height * 0.85,
          padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Text(
                    l10n.get('previewTitle'),
                    style: TextStyle(
                      fontSize: 16,
                      fontWeight: FontWeight.w600,
                      color: colors.textPrimary,
                    ),
                  ),
                  GestureDetector(
                    onTap: () => Navigator.pop(ctx),
                    child: const Icon(Icons.close, size: 20),
                  ),
                ],
              ),
              const TDDivider(),
              Expanded(
                child: SingleChildScrollView(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Container(width: 60, height: 4, color: colors.danger),
                      const SizedBox(height: 16),
                      Text(
                        _titleCtrl.text.isEmpty ? l10n.get('titleNotFilled') : _titleCtrl.text,
                        style: TextStyle(
                          fontSize: 20,
                          fontWeight: FontWeight.w700,
                          color: colors.textPrimary,
                        ),
                      ),
                      const SizedBox(height: 12),
                      Text(
                        l10n.getString('typeAndPublishDate', args: {'type': _type}),
                        style: TextStyle(
                          fontSize: 13,
                          color: colors.textSecondary,
                        ),
                      ),
                      const SizedBox(height: 16),
                      Container(
                        width: double.infinity,
                        height: 2,
                        color: colors.danger,
                      ),
                      const SizedBox(height: 16),
                      Text(
                        _contentCtrl.text.isEmpty
                            ? l10n.get('contentNotFilled')
                            : _contentCtrl.text,
                        style: TextStyle(
                          fontSize: 14,
                          color: colors.textSecondary,
                          height: 1.7,
                        ),
                      ),
                    ],
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  void _confirmPublish() {
    final l10n = AppLocalizations.of(context);
    showDialog(
      context: context,
      builder: (ctx) => TDAlertDialog(
        title: l10n.get('confirmPublishTitle'),
        contentWidget: Text(
          l10n.getString(
            'confirmPublishContent',
            args: {'title': _titleCtrl.text},
          ),
        ),
        leftBtn: TDDialogButtonOptions(
          title: l10n.get('cancel'),
          action: () => Navigator.pop(ctx),
        ),
        rightBtn: TDDialogButtonOptions(
          title: l10n.get('confirmPublish'),
          action: () {
            Navigator.pop(ctx);
            TDToast.showText(
              l10n.get('announcementPublished'),
              context: context,
            );
            context.pop();
          },
        ),
      ),
    );
  }

  void _saveDraft() {
    final l10n = AppLocalizations.of(context);
    TDToast.showText(l10n.get('draftSavedToast'), context: context);
  }

  void _pickAttachment() {
    final l10n = AppLocalizations.of(context);
    TDToast.showText(l10n.get('attachmentPicker'), context: context);
  }

  @override
  Widget build(BuildContext context) {
    final colors = Theme.of(context).extension<AppColorsExtension>()!;
    final r = ResponsiveHelper.of(context);
    final l10n = AppLocalizations.of(context);

    ref
        .read(navBarConfigProvider.notifier)
        .update(
          NavBarConfig(
            title: l10n.get('announcementCreate'),
            showBack: true,
            showRight: true,
            rightWidget: GestureDetector(
              onTap: _showPreview,
              child: Text(
                l10n.get('preview'),
                style: TextStyle(
                  fontSize: 14,
                  color: colors.primary,
                  fontWeight: FontWeight.w500,
                ),
              ),
            ),
            onBack: () => context.pop(),
          ),
        );

    return Column(
      children: [
        Expanded(
          child: Align(
            alignment: Alignment.topCenter,
            child: ConstrainedBox(
              constraints: BoxConstraints(maxWidth: r.formMaxWidth),
              child: SingleChildScrollView(
                padding: const EdgeInsets.symmetric(vertical: 8),
                child: Column(
                  children: [
                    // 基本信息
                    FormSection(
                      title: l10n.get('basicInfo'),
                      children: [
                        Container(
                          padding: const EdgeInsets.symmetric(
                            horizontal: 10,
                            vertical: 4,
                          ),
                          decoration: BoxDecoration(
                            color: colors.bgPage,
                            borderRadius: BorderRadius.circular(4),
                          ),
                          child: TDInput(
                            controller: _titleCtrl,
                            hintText: l10n.get('enterTitle'),
                          ),
                        ),
                        const SizedBox(height: 12),
                        GestureDetector(
                          onTap: _pickType,
                          child: Container(
                            padding: const EdgeInsets.symmetric(
                              horizontal: 10,
                              vertical: 12,
                            ),
                            decoration: BoxDecoration(
                              color: colors.bgPage,
                              borderRadius: BorderRadius.circular(4),
                            ),
                            child: Row(
                              mainAxisAlignment: MainAxisAlignment.spaceBetween,
                              children: [
                                Text(
                                  _type,
                                  style: TextStyle(
                                    fontSize: 14,
                                    color: colors.textPrimary,
                                  ),
                                ),
                                Icon(
                                  Icons.chevron_right,
                                  size: 14,
                                  color: colors.textPlaceholder,
                                ),
                              ],
                            ),
                          ),
                        ),
                      ],
                    ),

                    const SizedBox(height: 8),

                    // 公告正文
                    FormSection(
                      title: l10n.get('announcementContent'),
                      children: [
                        Container(
                          padding: const EdgeInsets.all(12),
                          decoration: BoxDecoration(
                            color: colors.bgPage,
                            borderRadius: BorderRadius.circular(4),
                          ),
                          height: 200,
                          child: TDInput(
                            controller: _contentCtrl,
                            maxLines: null,
                            hintText: l10n.get('enterContent'),
                          ),
                        ),
                      ],
                    ),

                    const SizedBox(height: 8),

                    // 附件
                    FormSection(
                      title: l10n.get('attachments'),
                      actionText: _attachments.length >= _maxAttachments
                          ? l10n.get('limitReached')
                          : l10n.get('add'),
                      showAction: _attachments.length < _maxAttachments,
                      actionIcon: Icons.attach_file,
                      onActionTap: _pickAttachment,
                      children: [
                        if (_attachments.isEmpty)
                          Text(
                            l10n.get('attachmentLimit'),
                            style: TextStyle(
                              fontSize: 12,
                              color: colors.textPlaceholder,
                            ),
                          )
                        else
                          Wrap(
                            spacing: 8,
                            runSpacing: 8,
                            children: _attachments.asMap().entries.map((entry) {
                              return TDTag(
                                entry.value,
                                size: TDTagSize.medium,
                                needCloseIcon: true,
                                onCloseTap: () {
                                  setState(
                                    () => _attachments.removeAt(entry.key),
                                  );
                                },
                              );
                            }).toList(),
                          ),
                      ],
                    ),

                    const SizedBox(height: 8),

                    // 发布设置
                    FormSection(
                      title: l10n.get('publishSettings'),
                      children: [
                        _buildSwitchRow(l10n.get('pinAnnouncement'), _isTop, (
                          v,
                        ) {
                          setState(() => _isTop = v);
                        }),
                        TDDivider(height: 1, color: colors.border),
                        GestureDetector(
                          onTap: _pickExpiryDate,
                          child: Container(
                            height: 44,
                            alignment: Alignment.centerLeft,
                            child: Row(
                              mainAxisAlignment: MainAxisAlignment.spaceBetween,
                              children: [
                                Text(
                                  l10n.get('validUntil'),
                                  style: TextStyle(
                                    fontSize: 14,
                                    color: colors.textSecondary,
                                  ),
                                ),
                                Text(
                                  _expiryDate != null
                                      ? '${_expiryDate!.year}-${_expiryDate!.month.toString().padLeft(2, '0')}-${_expiryDate!.day.toString().padLeft(2, '0')}'
                                      : l10n.get('expiryNever'),
                                  style: TextStyle(
                                    fontSize: 14,
                                    color: _expiryDate != null
                                        ? colors.primary
                                        : colors.textPlaceholder,
                                  ),
                                ),
                                Icon(
                                  Icons.chevron_right,
                                  size: 14,
                                  color: colors.textPlaceholder,
                                ),
                              ],
                            ),
                          ),
                        ),
                        TDDivider(height: 1, color: colors.border),
                        GestureDetector(
                          onTap: _showScopeDrawer,
                          child: Container(
                            height: 44,
                            alignment: Alignment.centerLeft,
                            child: Row(
                              mainAxisAlignment: MainAxisAlignment.spaceBetween,
                              children: [
                                Text(
                                  l10n.get('recipientScope'),
                                  style: TextStyle(
                                    fontSize: 14,
                                    color: colors.textSecondary,
                                  ),
                                ),
                                Row(
                                  mainAxisSize: MainAxisSize.min,
                                  children: [
                                    Text(
                                      _scopeMode == 0
                                          ? l10n.get('allStaff')
                                          : _scopeMode == 1
                                          ? '${l10n.get('byDept')}(${_selectedDepts.length})'
                                          : '${l10n.get('byUser')}(${_selectedUsers.length})',
                                      style: TextStyle(
                                        fontSize: 14,
                                        color: colors.primary,
                                      ),
                                    ),
                                      Text(
                                        l10n.get('coverageCount'),
                                        style: TextStyle(
                                          fontSize: 12,
                                          color: colors.textPlaceholder,
                                        ),
                                      ),
                                      const SizedBox(width: 4),
                                    Icon(
                                      Icons.chevron_right,
                                      size: 14,
                                      color: colors.textPlaceholder,
                                    ),
                                  ],
                                ),
                              ],
                            ),
                          ),
                        ),
                      ],
                    ),

                    const SizedBox(height: 80),
                  ],
                ),
              ),
            ),
          ),
        ),
        ActionBar(
          centerLabel: l10n.get('saveDraft'),
          rightLabel: l10n.get('publish'),
          showLeft: false,
          onCenterTap: _saveDraft,
          onRightTap: _confirmPublish,
        ),
      ],
    );
  }

  Widget _buildSwitchRow(
    String label,
    bool value,
    ValueChanged<bool> onChanged,
  ) {
    final colors = Theme.of(context).extension<AppColorsExtension>()!;
    return Container(
      height: 44,
      alignment: Alignment.centerLeft,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Text(
            label,
            style: TextStyle(fontSize: 14, color: colors.textSecondary),
          ),
          TDSwitch(
            isOn: value,
            onChanged: (v) {
              onChanged(v);
              return v;
            },
          ),
        ],
      ),
    );
  }
}