import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import '../../core/theme/app_colors.dart';
import '../../core/widgets/app_icon.dart';
import '../../core/widgets/app_icon_image.dart';
import '../../core/widgets/pressable.dart';
import '../../data/models/app_entry.dart';
import '../../data/models/slot_assignment.dart';
import '../../data/models/slot_type.dart';
import '../home/launcher_controller.dart';

Future<void> showAppPicker(BuildContext context, SlotType slot) {
  return showModalBottomSheet<void>(
    context: context,
    isScrollControlled: true,
    useSafeArea: false,
    backgroundColor: Colors.transparent,
    barrierColor: const Color(0x8A000000),
    builder: (_) => AppPickerSheet(slot: slot),
  );
}

class AppPickerSheet extends StatefulWidget {
  const AppPickerSheet({super.key, required this.slot});

  final SlotType slot;

  @override
  State<AppPickerSheet> createState() => _AppPickerSheetState();
}

class _AppPickerSheetState extends State<AppPickerSheet> {
  final _search = TextEditingController();
  String _query = '';
  @override
  void initState() {
    super.initState();
    final controller = context.read<LauncherController>();
    if (!controller.isLoadingApps) {
      controller.loadApps(force: true);
    }
  }

  @override
  void dispose() {
    _search.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    final theme = Theme.of(context);
    final launcher = context.watch<LauncherController>();
    final current = launcher.assignmentFor(widget.slot);
    final query = _query.trim().toLowerCase();
    final apps = launcher.apps
        .where(
          (app) => query.isEmpty || app.label.toLowerCase().contains(query),
        )
        .toList(growable: false);

    return Padding(
      padding: EdgeInsets.only(bottom: MediaQuery.viewInsetsOf(context).bottom),
      child: Container(
        height: MediaQuery.sizeOf(context).height * 0.86,
        decoration: BoxDecoration(
          color: colors.surface,
          borderRadius: const BorderRadius.vertical(top: Radius.circular(32)),
        ),
        child: Column(
          children: [
            const SizedBox(height: 12),
            Container(
              width: 44,
              height: 4,
              decoration: BoxDecoration(
                color: colors.inkFaint.withValues(alpha: 0.4),
                borderRadius: BorderRadius.circular(99),
              ),
            ),
            Padding(
              padding: const EdgeInsets.fromLTRB(28, 20, 18, 12),
              child: Row(
                children: [
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          'Choose ${widget.slot.label.toLowerCase()} app',
                          style: theme.textTheme.headlineSmall,
                        ),
                        const SizedBox(height: 3),
                        Text(
                          current == null
                              ? 'Pick any installed app'
                              : 'Currently ${current.label}',
                          style: theme.textTheme.bodySmall?.copyWith(
                            color: colors.inkMuted,
                          ),
                        ),
                      ],
                    ),
                  ),
                  if (current != null)
                    TextButton(
                      onPressed: () async {
                        await launcher.clearSlot(widget.slot);
                        if (context.mounted) Navigator.of(context).pop();
                      },
                      child: const Text('Clear'),
                    ),
                  _CircleButton(
                    iconAsset: 'assets/icons/x.svg',
                    semanticLabel: 'Close',
                    onTap: () => Navigator.of(context).pop(),
                  ),
                ],
              ),
            ),
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 24),
              child: TextField(
                controller: _search,
                onChanged: (value) => setState(() => _query = value),
                textInputAction: TextInputAction.search,
                style: theme.textTheme.bodyLarge,
                decoration: InputDecoration(
                  hintText: 'Search apps',
                  prefixIcon: Padding(
                    padding: const EdgeInsets.only(left: 4),
                    child: AppIcon(
                      'assets/icons/search.svg',
                      size: 20,
                      color: colors.inkFaint,
                    ),
                  ),
                  suffixIcon: _query.isEmpty
                      ? null
                      : IconButton(
                          onPressed: () {
                            _search.clear();
                            setState(() => _query = '');
                          },
                          icon: Icon(
                            Icons.close_rounded,
                            size: 20,
                            color: colors.inkFaint,
                          ),
                        ),
                ),
              ),
            ),
            const SizedBox(height: 12),
            Expanded(child: _buildBody(context, launcher, apps, current)),
          ],
        ),
      ),
    );
  }

  Widget _buildBody(
    BuildContext context,
    LauncherController launcher,
    List<AppEntry> apps,
    SlotAssignment? current,
  ) {
    final colors = context.colors;
    final theme = Theme.of(context);

    if (apps.isEmpty && launcher.isLoadingApps) {
      return Center(
        child: SizedBox(
          width: 28,
          height: 28,
          child: CircularProgressIndicator(
            strokeWidth: 2.4,
            color: colors.accent,
          ),
        ),
      );
    }

    if (apps.isEmpty && launcher.appsError != null) {
      return Center(
        child: Padding(
          padding: const EdgeInsets.all(32),
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Text(
                'Could not read installed apps.',
                style: theme.textTheme.bodyLarge,
                textAlign: TextAlign.center,
              ),
              const SizedBox(height: 12),
              TextButton(
                onPressed: () => launcher.loadApps(force: true),
                child: const Text('Try again'),
              ),
            ],
          ),
        ),
      );
    }

    if (apps.isEmpty) {
      return Center(
        child: Text(
          'No apps match “${_query.trim()}”.',
          style: theme.textTheme.bodyMedium?.copyWith(color: colors.inkMuted),
        ),
      );
    }

    return ListView.builder(
      padding: const EdgeInsets.fromLTRB(16, 0, 16, 28),
      itemCount: apps.length,
      itemBuilder: (context, index) {
        final app = apps[index];
        final selected =
            current != null &&
            current.packageName == app.packageName &&
            current.activityName == app.activityName;
        return Padding(
          padding: const EdgeInsets.symmetric(vertical: 2),
          child: Material(
            color: Colors.transparent,
            child: InkWell(
              borderRadius: BorderRadius.circular(20),
              onTap: () async {
                await launcher.assign(widget.slot, app);
                if (context.mounted) Navigator.of(context).pop();
              },
              child: Padding(
                padding: const EdgeInsets.symmetric(
                  horizontal: 12,
                  vertical: 11,
                ),
                child: Row(
                  children: [
                    AppIconImage(bytes: app.icon, size: 42),
                    const SizedBox(width: 16),
                    Expanded(
                      child: Text(
                        app.label,
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        style: theme.textTheme.bodyLarge?.copyWith(
                          fontWeight: FontWeight.w500,
                        ),
                      ),
                    ),
                    if (selected)
                      Container(
                        width: 26,
                        height: 26,
                        decoration: BoxDecoration(
                          color: colors.accent,
                          shape: BoxShape.circle,
                        ),
                        child: AppIcon(
                          'assets/icons/check.svg',
                          size: 15,
                          color: colors.accentInk,
                        ),
                      ),
                  ],
                ),
              ),
            ),
          ),
        );
      },
    );
  }
}

class _CircleButton extends StatelessWidget {
  const _CircleButton({
    required this.iconAsset,
    required this.semanticLabel,
    required this.onTap,
  });

  final String iconAsset;
  final String semanticLabel;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    return Pressable(
      onTap: onTap,
      semanticLabel: semanticLabel,
      pressedScale: 0.92,
      child: Container(
        width: 40,
        height: 40,
        decoration: BoxDecoration(
          color: colors.surfaceStrong,
          shape: BoxShape.circle,
          border: Border.all(color: colors.border),
        ),
        alignment: Alignment.center,
        child: AppIcon(iconAsset, size: 17, color: colors.inkMuted),
      ),
    );
  }
}