import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import '../../core/theme/app_colors.dart';
import '../shell/nav_bar_config.dart';
import '../../core/utils/responsive.dart';
import '../../shared/widgets/action_bar.dart';
import '../../core/i18n/app_localizations.dart';
import '../../shared/widgets/form_section.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';
  String _scope = '全员';
  bool _isTop = false;
  DateTime _expiryDate = DateTime.now().add(const Duration(days: 30));

  final _types = ['通知公告', '人事与制度', '放假与活动'];

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

  @override
  Widget build(BuildContext context) {
    final r = ResponsiveHelper.of(context);
    final l10n = AppLocalizations.of(context);

    ref
        .read(navBarConfigProvider.notifier)
        .update(
          NavBarConfig(
            title: l10n.get('announcementCreate'),
            showBack: true,
            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: '基本信息',
                      children: [
                        // 标题输入
                        Container(
                          padding: const EdgeInsets.symmetric(
                            horizontal: 10,
                            vertical: 12,
                          ),
                          decoration: BoxDecoration(
                            color: AppColors.bgPage,
                            borderRadius: BorderRadius.circular(4),
                          ),
                          child: TextField(
                            controller: _titleCtrl,
                            decoration: const InputDecoration(
                              hintText: '请输入公告标题',
                              hintStyle: TextStyle(
                                fontSize: 14,
                                color: AppColors.textPlaceholder,
                              ),
                              border: InputBorder.none,
                              contentPadding: EdgeInsets.zero,
                              isDense: true,
                            ),
                            style: const TextStyle(
                              fontSize: 14,
                              color: AppColors.textPrimary,
                            ),
                          ),
                        ),
                        const SizedBox(height: 12),
                        // 公告类型
                        _buildSelectRow('公告类型', _type, _pickType),
                      ],
                    ),

                    const SizedBox(height: 16),

                    // 公告内容
                    FormSection(
                      title: '公告内容',
                      children: [
                        Container(
                          padding: const EdgeInsets.all(12),
                          decoration: BoxDecoration(
                            color: AppColors.bgPage,
                            borderRadius: BorderRadius.circular(4),
                          ),
                          height: 200,
                          child: TextField(
                            controller: _contentCtrl,
                            maxLines: null,
                            expands: true,
                            textAlignVertical: TextAlignVertical.top,
                            decoration: const InputDecoration(
                              hintText: '请输入公告正文内容...',
                              hintStyle: TextStyle(
                                fontSize: 14,
                                color: AppColors.textPlaceholder,
                              ),
                              border: InputBorder.none,
                              contentPadding: EdgeInsets.zero,
                            ),
                            style: const TextStyle(
                              fontSize: 14,
                              color: AppColors.textPrimary,
                              height: 1.7,
                            ),
                          ),
                        ),
                      ],
                    ),

                    const SizedBox(height: 16),

                    // 发布设置
                    FormSection(
                      title: '发布设置',
                      children: [
                        // 置顶开关
                        _buildSwitchRow('置顶公告', _isTop, (v) {
                          setState(() => _isTop = v);
                        }),
                        const Divider(height: 1, color: AppColors.border),
                        // 有效期
                        _buildSelectRow(
                          '有效期至',
                          '${_expiryDate.year}-${_expiryDate.month.toString().padLeft(2, '0')}-${_expiryDate.day.toString().padLeft(2, '0')}',
                          _pickExpiryDate,
                        ),
                        const Divider(height: 1, color: AppColors.border),
                        // 接收范围
                        _buildSelectRow('接收范围', _scope, _pickScope),
                      ],
                    ),

                    const SizedBox(height: 16),

                    // 附件
                    FormSection(
                      title: '附件',
                      children: [
                        Container(
                          height: 80,
                          decoration: BoxDecoration(
                            color: AppColors.bgPage,
                            borderRadius: BorderRadius.circular(4),
                          ),
                          child: const Center(
                            child: Column(
                              mainAxisAlignment: MainAxisAlignment.center,
                              children: [
                                Icon(
                                  Icons.add_photo_alternate_outlined,
                                  size: 28,
                                  color: AppColors.primary,
                                ),
                                SizedBox(height: 4),
                                Text(
                                  '添加附件',
                                  style: TextStyle(
                                    fontSize: 12,
                                    color: AppColors.primary,
                                  ),
                                ),
                              ],
                            ),
                          ),
                        ),
                      ],
                    ),

                    const SizedBox(height: 80),
                  ],
                ),
              ),
            ),
          ),
        ),
        // ActionBar
        ActionBar(
          centerLabel: '存草稿',
          rightLabel: '发布',
          showLeft: false,
          onCenterTap: _saveDraft,
          onRightTap: _submit,
        ),
      ],
    );
  }

  Widget _buildSelectRow(String label, String value, VoidCallback onTap) {
    return GestureDetector(
      onTap: onTap,
      child: Container(
        height: 44,
        alignment: Alignment.centerLeft,
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Text(
              label,
              style: const TextStyle(
                fontSize: 14,
                color: AppColors.textSecondary,
              ),
            ),
            Row(
              mainAxisSize: MainAxisSize.min,
              children: [
                Text(
                  value,
                  style: const TextStyle(
                    fontSize: 14,
                    color: AppColors.primary,
                  ),
                ),
                const SizedBox(width: 4),
                const Icon(
                  Icons.chevron_right,
                  size: 14,
                  color: AppColors.textPlaceholder,
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildSwitchRow(
    String label,
    bool value,
    ValueChanged<bool> onChanged,
  ) {
    return Container(
      height: 44,
      alignment: Alignment.centerLeft,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Text(
            label,
            style: const TextStyle(
              fontSize: 14,
              color: AppColors.textSecondary,
            ),
          ),
          Switch(
            value: value,
            onChanged: onChanged,
            activeColor: AppColors.primary,
          ),
        ],
      ),
    );
  }

  Future<void> _pickType() async {
    final result = await showDialog<String>(
      context: context,
      builder: (ctx) => SimpleDialog(
        title: const Text('选择公告类型'),
        children: _types
            .map(
              (t) => SimpleDialogOption(
                onPressed: () => Navigator.pop(ctx, t),
                child: Text(t),
              ),
            )
            .toList(),
      ),
    );
    if (result != null) setState(() => _type = result);
  }

  Future<void> _pickExpiryDate() async {
    final picked = await showDatePicker(
      context: context,
      initialDate: _expiryDate,
      firstDate: DateTime.now(),
      lastDate: DateTime(2030),
    );
    if (picked != null) setState(() => _expiryDate = picked);
  }

  Future<void> _pickScope() async {
    final result = await showDialog<String>(
      context: context,
      builder: (ctx) => SimpleDialog(
        title: const Text('选择接收范围'),
        children: ['全员', '部门']
            .map(
              (s) => SimpleDialogOption(
                onPressed: () => Navigator.pop(ctx, s),
                child: Text(s),
              ),
            )
            .toList(),
      ),
    );
    if (result != null) setState(() => _scope = result);
  }

  void _saveDraft() {
    // TODO: 存草稿逻辑
    ScaffoldMessenger.of(
      context,
    ).showSnackBar(const SnackBar(content: Text('已保存草稿')));
  }

  Future<void> _submit() async {
    await Future.delayed(const Duration(milliseconds: 500));
    if (context.mounted) {
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(const SnackBar(content: Text('公告发布成功')));
      context.pop();
    }
  }
}