import 'package:flutter/material.dart';
import 'package:package_info_plus/package_info_plus.dart';
import 'package:url_launcher/url_launcher.dart';
import '../theme/app_colors.dart';

/// Full-page About screen with app info, version, and links.
class AboutScreen extends StatefulWidget {
  const AboutScreen({super.key});

  @override
  State<AboutScreen> createState() => _AboutScreenState();
}

class _AboutScreenState extends State<AboutScreen> {
  PackageInfo? _packageInfo;

  @override
  void initState() {
    super.initState();
    _loadPackageInfo();
  }

  Future<void> _loadPackageInfo() async {
    final info = await PackageInfo.fromPlatform();
    if (mounted) setState(() => _packageInfo = info);
  }

  Future<void> _openUrl(String url) async {
    final uri = Uri.parse(url);
    await launchUrl(uri, mode: LaunchMode.externalApplication);
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final isDark = theme.brightness == Brightness.dark;
    final version = _packageInfo != null
        ? 'v${_packageInfo!.version} (${_packageInfo!.buildNumber})'
        : '…';

    return Scaffold(
      appBar: AppBar(
        title: const Text('About'),
      ),
      body: ListView(
        padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 16),
        children: [
          const SizedBox(height: 16),

          // ── App icon + name ──
          Center(
            child: Container(
              width: 96,
              height: 96,
              decoration: const BoxDecoration(
                gradient: AppColors.brandGradient,
                shape: BoxShape.circle,
              ),
              child: const Icon(
                Icons.directions_car_filled,
                color: Colors.white,
                size: 52,
              ),
            ),
          ),
          const SizedBox(height: 16),
          Center(
            child: Text(
              'HW Collector Hub',
              style: theme.textTheme.headlineSmall?.copyWith(
                fontWeight: FontWeight.bold,
              ),
            ),
          ),
          const SizedBox(height: 4),
          Center(
            child: Text(
              version,
              style: theme.textTheme.bodyMedium?.copyWith(
                color: AppColors.textSecondary,
              ),
            ),
          ),
          const SizedBox(height: 8),
          Center(
            child: Text(
              'Track and manage your Hot Wheels collection.',
              style: theme.textTheme.bodyMedium?.copyWith(
                color: AppColors.textHint,
              ),
              textAlign: TextAlign.center,
            ),
          ),

          const SizedBox(height: 32),
          const Divider(),
          const SizedBox(height: 16),

          // ── Links section ──
          Text(
            'Links',
            style: theme.textTheme.titleMedium?.copyWith(
              fontWeight: FontWeight.w600,
              color: AppColors.textSecondary,
            ),
          ),
          const SizedBox(height: 8),

          _LinkTile(
            icon: Icons.coffee,
            iconColor: const Color(0xFFFFDD00),
            title: 'Buy Me a Coffee',
            subtitle: 'Support the development',
            onTap: () =>
                _openUrl('https://buymeacoffee.com/derkauzigekoala'),
          ),

          const SizedBox(height: 32),
          const Divider(),
          const SizedBox(height: 16),

          // ── Technical details ──
          Text(
            'Technical',
            style: theme.textTheme.titleMedium?.copyWith(
              fontWeight: FontWeight.w600,
              color: AppColors.textSecondary,
            ),
          ),
          const SizedBox(height: 8),

          _InfoRow(label: 'Version', value: _packageInfo?.version ?? '…'),
          _InfoRow(
            label: 'Build',
            value: _packageInfo?.buildNumber ?? '…',
          ),
          _InfoRow(
            label: 'Package',
            value: _packageInfo?.packageName ?? '…',
          ),

          const SizedBox(height: 32),

          // ── Powered by ──
          Center(
            child: Column(
              children: [
                Text(
                  'Powered by Flutter & Supabase',
                  style: theme.textTheme.bodySmall?.copyWith(
                    color: AppColors.textHint,
                  ),
                ),
                const SizedBox(height: 4),
                Text(
                  '© 2026 HW Collector Hub',
                  style: theme.textTheme.bodySmall?.copyWith(
                    color: AppColors.textHint,
                  ),
                ),
              ],
            ),
          ),
          const SizedBox(height: 24),
        ],
      ),
    );
  }
}

// ── Link tile ─────────────────────────────────────────────────────────

class _LinkTile extends StatelessWidget {
  final IconData icon;
  final Color iconColor;
  final String title;
  final String subtitle;
  final VoidCallback onTap;

  const _LinkTile({
    required this.icon,
    required this.iconColor,
    required this.title,
    required this.subtitle,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    return Card(
      margin: const EdgeInsets.symmetric(vertical: 4),
      child: ListTile(
        leading: Container(
          padding: const EdgeInsets.all(8),
          decoration: BoxDecoration(
            color: iconColor.withValues(alpha: 0.15),
            borderRadius: BorderRadius.circular(10),
          ),
          child: Icon(icon, color: iconColor, size: 22),
        ),
        title: Text(
          title,
          style: const TextStyle(fontWeight: FontWeight.w500),
        ),
        subtitle: Text(subtitle, style: const TextStyle(fontSize: 12)),
        trailing: const Icon(Icons.open_in_new, color: AppColors.textHint, size: 18),
        onTap: onTap,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
      ),
    );
  }
}

// ── Info row (label : value) ──────────────────────────────────────────

class _InfoRow extends StatelessWidget {
  final String label;
  final String value;

  const _InfoRow({required this.label, required this.value});

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 6),
      child: Row(
        children: [
          Text(
            label,
            style: const TextStyle(
              color: AppColors.textSecondary,
              fontWeight: FontWeight.w500,
            ),
          ),
          const Spacer(),
          Text(
            value,
            style: const TextStyle(color: AppColors.textHint),
          ),
        ],
      ),
    );
  }
}