import 'package:flutter/material.dart';

import '../theme/theme.dart';
import 'app_list_inset.dart';

/// Widest an inline [AppListRow.value] may grow before it ellipsises, leaving
/// room for a reasonable title beside it.
const double _maxValueWidth = 180.0;

/// Row height comes entirely from this padding — rows carry a single line of
/// text most of the time, so it sets how airy a card reads.
const double _rowVerticalPadding = Grid.xs;

/// A flush, borderless settings/list row: leading icon, title, optional
/// subtitle and trailing widget. Its own background comes from whatever
/// contains it — a grouped card, or the page itself.
class AppListRow extends StatelessWidget {
  const AppListRow({
    super.key,
    this.icon,
    required this.title,
    this.subtitle,
    this.subtitleStyle,
    this.subtitleMaxLines,
    this.value,
    this.trailing,
    this.titleColor,
    this.onTap,
  });

  final IconData? icon;
  final String title;
  final String? subtitle;
  final TextStyle? subtitleStyle;
  final int? subtitleMaxLines;

  /// The row's current setting, shown muted on the trailing side next to
  /// [trailing] — for rows whose value is short enough to sit inline.
  final String? value;

  final Widget? trailing;
  final Color? titleColor;
  final VoidCallback? onTap;

  @override
  Widget build(BuildContext context) {
    final row = Padding(
      padding: EdgeInsets.symmetric(
        horizontal: AppListInset.of(context),
        vertical: _rowVerticalPadding,
      ),
      child: Row(
        // Centred rather than baseline-aligned to the title: on a two-line row
        // the icon and trailing control read as belonging to the row, not to
        // its first line.
        children: [
          if (icon != null) ...[
            Icon(
              icon,
              size: 22,
              color: titleColor ?? context.colors.onSurfaceVariant,
            ),
            const SizedBox(width: Grid.xs),
          ],
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              mainAxisSize: MainAxisSize.min,
              children: [
                Text(
                  title,
                  style: context.textTheme.bodyLarge?.copyWith(
                    color: titleColor,
                  ),
                ),
                if (subtitle != null) ...[
                  const SizedBox(height: Grid.quarter),
                  Text(
                    subtitle!,
                    style:
                        subtitleStyle ??
                        context.textTheme.bodySmall?.copyWith(
                          color: context.colors.onSurfaceVariant,
                        ),
                    maxLines: subtitleMaxLines,
                    overflow: subtitleMaxLines == null
                        ? null
                        : TextOverflow.ellipsis,
                  ),
                ],
              ],
            ),
          ),
          if (value != null) ...[
            const SizedBox(width: Grid.xxs),
            // Inflexible, so the title's Expanded absorbs the slack and the
            // value stays flush against the trailing edge; capped instead of
            // flexed so a long value ellipsises rather than overflowing.
            ConstrainedBox(
              constraints: const BoxConstraints(maxWidth: _maxValueWidth),
              child: Text(
                value!,
                style: context.textTheme.bodyMedium?.copyWith(
                  color: context.colors.onSurfaceVariant,
                ),
                maxLines: 1,
                overflow: TextOverflow.ellipsis,
                textAlign: TextAlign.right,
              ),
            ),
          ],
          if (trailing != null) ...[const SizedBox(width: Grid.xxs), trailing!],
        ],
      ),
    );

    if (onTap == null) return row;
    return InkWell(onTap: onTap, child: row);
  }
}

/// A custom leading widget variant of [AppListRow] for rows whose leading
/// slot is not a plain [IconData] (e.g. an emoji or image).
class AppListRowRaw extends StatelessWidget {
  const AppListRowRaw({
    super.key,
    required this.leading,
    required this.title,
    this.subtitle,
    this.trailing,
    this.onTap,
  });

  final Widget leading;
  final Widget title;
  final Widget? subtitle;
  final Widget? trailing;
  final VoidCallback? onTap;

  @override
  Widget build(BuildContext context) {
    final row = Padding(
      padding: EdgeInsets.symmetric(
        horizontal: AppListInset.of(context),
        vertical: _rowVerticalPadding,
      ),
      child: Row(
        children: [
          leading,
          const SizedBox(width: Grid.xs),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              mainAxisSize: MainAxisSize.min,
              children: [
                title,
                if (subtitle != null) ...[
                  const SizedBox(height: Grid.quarter),
                  subtitle!,
                ],
              ],
            ),
          ),
          if (trailing != null) ...[const SizedBox(width: Grid.xxs), trailing!],
        ],
      ),
    );

    if (onTap == null) return row;
    return InkWell(onTap: onTap, child: row);
  }
}