import 'package:flutter/material.dart';

import '../theme/app_surfaces.dart';
import 'mono_text.dart';

/// Cyber/IT metric / stat card — an uppercase telemetry label above a large
/// monospace value, on a flat tonal surface with a hairline outline.
///
/// The single shared style for KPI/stat tiles (unifies the Dashboard KPI card,
/// the Network Map "Sites/Devices" cards, and the Reports conversion tile).
/// Purely presentational: callers pass already-resolved [title]/[value] strings.
class AppMetricCard extends StatelessWidget {
  const AppMetricCard({
    super.key,
    required this.title,
    required this.value,
    this.icon,
    this.onTap,
    this.trailing,
    this.animateValue = true,
  });

  final String title;
  final String value;

  /// Optional leading accent glyph.
  final IconData? icon;

  final VoidCallback? onTap;

  /// Optional trailing widget (e.g. a chevron for drill-down cards).
  final Widget? trailing;

  /// Cross-fade the value when it changes (nice for live-updating metrics).
  final bool animateValue;

  @override
  Widget build(BuildContext context) {
    final cs = Theme.of(context).colorScheme;
    final tt = Theme.of(context).textTheme;
    final isDark = cs.brightness == Brightness.dark;
    final radius = AppSurfaces.of(context).cardRadius;

    final valueWidget = MonoText(
      value,
      key: ValueKey(value),
      style: tt.headlineSmall?.copyWith(
        fontWeight: FontWeight.w700,
        color: cs.onSurface,
      ),
      maxLines: 1,
      overflow: TextOverflow.ellipsis,
    );

    final content = Padding(
      padding: const EdgeInsets.all(20),
      child: Row(
        children: [
          if (icon != null) ...[
            Icon(icon, size: 22, color: cs.primary),
            const SizedBox(width: 14),
          ],
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              mainAxisSize: MainAxisSize.min,
              children: [
                Text(
                  title.toUpperCase(),
                  style: tt.labelMedium?.copyWith(
                    fontWeight: FontWeight.w600,
                    letterSpacing: 0.6,
                    color: cs.onSurfaceVariant,
                  ),
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                ),
                const SizedBox(height: 10),
                if (animateValue)
                  AnimatedSwitcher(
                    duration: const Duration(milliseconds: 400),
                    switchInCurve: Curves.easeOutCubic,
                    switchOutCurve: Curves.easeInCubic,
                    transitionBuilder: (child, anim) =>
                        FadeTransition(opacity: anim, child: child),
                    child: valueWidget,
                  )
                else
                  valueWidget,
              ],
            ),
          ),
          if (trailing != null) ...[const SizedBox(width: 8), trailing!],
        ],
      ),
    );

    final decorated = AnimatedContainer(
      duration: const Duration(milliseconds: 400),
      curve: Curves.easeOutCubic,
      decoration: BoxDecoration(
        color: isDark ? cs.surfaceContainer : cs.surfaceContainerLowest,
        borderRadius: BorderRadius.circular(radius),
        border: Border.all(color: cs.outlineVariant),
      ),
      child: content,
    );

    if (onTap == null) return decorated;
    return Material(
      color: Colors.transparent,
      child: InkWell(
        onTap: onTap,
        borderRadius: BorderRadius.circular(radius),
        child: decorated,
      ),
    );
  }
}