import 'package:flutter/material.dart';

import '../../core/app_state.dart';
import '../../core/app_theme.dart';
import '../../widgets/app_widgets.dart';

/// Opens a "我的" sub page. Pushed routes sit above the shell, so each page
/// listens to [state] itself to stay current.
Future<void> openProfilePage(
  BuildContext context, {
  required AppState state,
  required String title,
  required WidgetBuilder builder,
}) => Navigator.of(context).push(
  MaterialPageRoute<void>(
    builder: (context) => AppPage(
      appBar: AppBar(title: Text(title)),
      child: ListenableBuilder(
        listenable: state,
        builder: (context, _) => builder(context),
      ),
    ),
  ),
);

/// A titled card whose rows are separated by dividers.
class MenuGroup extends StatelessWidget {
  const MenuGroup({super.key, this.title, this.note, required this.children});
  final String? title;
  final String? note;
  final List<Widget> children;

  @override
  Widget build(BuildContext context) => Column(
    crossAxisAlignment: CrossAxisAlignment.start,
    children: [
      if (title != null || note != null)
        Padding(
          padding: const EdgeInsets.only(left: 4, bottom: 8),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              if (title != null)
                Text(
                  title!,
                  style: TextStyle(fontSize: 13, color: AppColors.muted),
                ),
              if (note != null)
                Text(
                  note!,
                  style: TextStyle(fontSize: 12, color: AppColors.muted),
                ),
            ],
          ),
        ),
      SectionCard(
        padding: EdgeInsets.zero,
        child: Column(
          children: [
            for (var i = 0; i < children.length; i++) ...[
              if (i > 0) Divider(height: 1, color: AppColors.line),
              children[i],
            ],
          ],
        ),
      ),
    ],
  );
}

/// One row of a [MenuGroup]: icon, title, optional current value and chevron.
class MenuTile extends StatelessWidget {
  const MenuTile({
    super.key,
    required this.icon,
    required this.title,
    this.subtitle,
    this.value,
    this.iconColor,
    this.trailing,
    this.onTap,
  });
  final IconData icon;
  final String title;
  final String? subtitle;
  final String? value;
  final Color? iconColor;
  final Widget? trailing;
  final VoidCallback? onTap;

  @override
  Widget build(BuildContext context) => ListTile(
    contentPadding: const EdgeInsets.symmetric(horizontal: 14),
    leading: Icon(icon, color: iconColor ?? AppColors.muted),
    title: Text(title),
    subtitle: subtitle == null ? null : Text(subtitle!),
    trailing:
        trailing ??
        Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            if (value != null)
              Text(
                value!,
                style: TextStyle(fontSize: 13, color: AppColors.muted),
              ),
            if (onTap != null)
              Icon(Icons.chevron_right, color: AppColors.muted),
          ],
        ),
    onTap: onTap,
  );
}

/// A [MenuTile]-aligned switch row.
class MenuSwitch extends StatelessWidget {
  const MenuSwitch({
    super.key,
    required this.icon,
    required this.title,
    this.subtitle,
    required this.value,
    required this.onChanged,
  });
  final IconData icon;
  final String title;
  final String? subtitle;
  final bool value;
  final ValueChanged<bool> onChanged;

  @override
  Widget build(BuildContext context) => SwitchListTile(
    contentPadding: const EdgeInsets.symmetric(horizontal: 14),
    secondary: Icon(icon, color: AppColors.muted),
    title: Text(title),
    subtitle: subtitle == null ? null : Text(subtitle!),
    value: value,
    activeThumbColor: AppColors.green,
    onChanged: onChanged,
  );
}

/// A labelled progress bar, e.g. "可使用 31 / 48".
class GoalProgressRow extends StatelessWidget {
  const GoalProgressRow({
    super.key,
    required this.icon,
    required this.title,
    required this.note,
    required this.value,
    required this.goal,
  });
  final IconData icon;
  final String title;
  final String note;
  final int value;
  final int goal;

  @override
  Widget build(BuildContext context) {
    final completed = value >= goal;
    return Padding(
      padding: const EdgeInsets.all(14),
      child: Row(
        children: [
          Icon(icon, color: completed ? AppColors.green : AppColors.muted),
          const SizedBox(width: 12),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Row(
                  children: [
                    Expanded(
                      child: Text(
                        title,
                        style: const TextStyle(fontWeight: FontWeight.w600),
                      ),
                    ),
                    Text(
                      '$value / $goal',
                      style: TextStyle(color: AppColors.muted),
                    ),
                  ],
                ),
                const SizedBox(height: 6),
                ProgressBar(value: goal == 0 ? 0 : value / goal),
                const SizedBox(height: 6),
                Text(note, style: Theme.of(context).textTheme.bodyMedium),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

class ProgressBar extends StatelessWidget {
  const ProgressBar({super.key, required this.value, this.background});
  final double value;
  final Color? background;

  @override
  Widget build(BuildContext context) => ClipRRect(
    borderRadius: BorderRadius.circular(4),
    child: LinearProgressIndicator(
      value: value.clamp(0, 1).toDouble(),
      minHeight: 6,
      color: AppColors.green,
      backgroundColor: background ?? AppColors.surfaceMuted,
    ),
  );
}

/// A red row that asks for explicit acknowledgement before [onConfirm].
class DangerAction extends StatelessWidget {
  const DangerAction({
    super.key,
    required this.label,
    required this.message,
    this.details,
    this.acknowledgement,
    required this.onConfirm,
  });
  final String label;
  final String message;
  final String? details;

  /// When set, the confirm button stays disabled until this box is ticked.
  final String? acknowledgement;
  final VoidCallback onConfirm;

  @override
  Widget build(BuildContext context) => ListTile(
    contentPadding: const EdgeInsets.symmetric(horizontal: 14),
    leading: const Icon(Icons.delete_forever_outlined, color: Colors.redAccent),
    title: Text(label, style: const TextStyle(color: Colors.redAccent)),
    onTap: () => showDialog<void>(
      context: context,
      builder: (context) {
        var acknowledged = acknowledgement == null;
        return StatefulBuilder(
          builder: (context, setDialogState) => AlertDialog(
            title: Text(label),
            content: Column(
              mainAxisSize: MainAxisSize.min,
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(message),
                if (details != null) ...[
                  const SizedBox(height: 12),
                  Text(details!),
                ],
                if (acknowledgement != null)
                  CheckboxListTile(
                    contentPadding: EdgeInsets.zero,
                    value: acknowledged,
                    onChanged: (value) =>
                        setDialogState(() => acknowledged = value ?? false),
                    title: Text(acknowledgement!),
                  ),
              ],
            ),
            actions: [
              TextButton(
                onPressed: () => Navigator.pop(context),
                child: const Text('取消'),
              ),
              FilledButton(
                style: FilledButton.styleFrom(
                  backgroundColor: Colors.redAccent,
                ),
                onPressed: acknowledged
                    ? () {
                        Navigator.pop(context);
                        onConfirm();
                      }
                    : null,
                child: const Text('确认清除'),
              ),
            ],
          ),
        );
      },
    ),
  );
}

String relativeTime(DateTime time) {
  final difference = DateTime.now().difference(time);
  if (difference.inMinutes < 1) return '刚刚';
  if (difference.inHours < 1) return '${difference.inMinutes} 分钟前';
  if (difference.inDays < 1) return '${difference.inHours} 小时前';
  return '${difference.inDays} 天前';
}