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 '../../core/widgets/surface_card.dart';
import '../../data/models/slot_assignment.dart';
import 'launcher_controller.dart';
import 'style_icon_choices.dart';

const _sheetBarrier = Color(0x8A000000);

/// The long-press menu for an app pinned to Home.
Future<void> showPinnedAppMenu(
  BuildContext context,
  SlotAssignment assignment,
) async {
  final launcher = context.read<LauncherController>();
  final app = launcher.appForAssignment(assignment);

  await showModalBottomSheet<void>(
    context: context,
    useSafeArea: true,
    backgroundColor: Colors.transparent,
    barrierColor: _sheetBarrier,
    builder: (sheetContext) {
      final colors = sheetContext.colors;
      final theme = Theme.of(sheetContext);

      Future<void> closeThen(Future<void> Function() action) async {
        Navigator.of(sheetContext).pop();
        await Future<void>.delayed(const Duration(milliseconds: 190));
        if (!context.mounted) return;
        await action();
      }

      return Padding(
        padding: const EdgeInsets.fromLTRB(20, 0, 20, 20),
        child: Center(
          heightFactor: 1,
          child: ConstrainedBox(
            constraints: const BoxConstraints(maxWidth: 480),
            child: SurfaceCard(
              padding: const EdgeInsets.fromLTRB(22, 18, 22, 16),
              radius: 28,
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Row(
                    children: [
                      if (assignment.iconAsset != null)
                        Container(
                          width: 44,
                          height: 44,
                          decoration: BoxDecoration(
                            color: colors.surfaceStrong,
                            borderRadius: BorderRadius.circular(15),
                            border: Border.all(color: colors.border),
                          ),
                          alignment: Alignment.center,
                          child: AppIcon(
                            assignment.iconAsset!,
                            size: 22,
                            color: colors.ink,
                          ),
                        )
                      else
                        AppIconImage(bytes: app?.icon, size: 44),
                      const SizedBox(width: 14),
                      Expanded(
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            Text(
                              assignment.label.isEmpty
                                  ? assignment.packageName
                                  : assignment.label,
                              maxLines: 1,
                              overflow: TextOverflow.ellipsis,
                              style: theme.textTheme.titleMedium,
                            ),
                            const SizedBox(height: 2),
                            Text(
                              'Home shortcut',
                              style: theme.textTheme.bodySmall?.copyWith(
                                color: colors.inkMuted,
                              ),
                            ),
                          ],
                        ),
                      ),
                      Pressable(
                        onTap: () => Navigator.of(sheetContext).pop(),
                        semanticLabel: 'Close',
                        pressedScale: 0.92,
                        child: Container(
                          width: 38,
                          height: 38,
                          decoration: BoxDecoration(
                            color: colors.surfaceStrong,
                            shape: BoxShape.circle,
                            border: Border.all(color: colors.border),
                          ),
                          alignment: Alignment.center,
                          child: AppIcon(
                            'assets/icons/x.svg',
                            size: 16,
                            color: colors.inkMuted,
                          ),
                        ),
                      ),
                    ],
                  ),
                  const SizedBox(height: 12),
                  Divider(color: colors.border, height: 1),
                  const SizedBox(height: 4),
                  _MenuAction(
                    iconAsset: 'assets/icons/pencil.svg',
                    title: 'Rename',
                    onTap: () => closeThen(() async {
                      final name = await _showRenameDialog(context, assignment);
                      if (name != null) {
                        await launcher.renamePinnedApp(assignment, name);
                      }
                    }),
                  ),
                  _MenuAction(
                    iconAsset: 'assets/icons/image.svg',
                    title: 'Change icon',
                    onTap: () => closeThen(
                      () => showPinnedIconPicker(context, assignment),
                    ),
                  ),
                  _MenuAction(
                    iconAsset: 'assets/icons/delete.svg',
                    title: 'Remove',
                    danger: true,
                    onTap: () => closeThen(() async {
                      await launcher.removePinnedApp(assignment);
                      if (context.mounted) {
                        ScaffoldMessenger.of(context).hideCurrentSnackBar();
                        ScaffoldMessenger.of(context).showSnackBar(
                          SnackBar(
                            content: Text(
                              '${assignment.label.isEmpty ? 'App' : assignment.label} '
                              'removed from Home',
                            ),
                          ),
                        );
                      }
                    }),
                  ),
                ],
              ),
            ),
          ),
        ),
      );
    },
  );
}

Future<String?> _showRenameDialog(
  BuildContext context,
  SlotAssignment assignment,
) async {
  final controller = TextEditingController(text: assignment.label);
  try {
    return await showDialog<String>(
      context: context,
      builder: (dialogContext) {
        void submit() {
          final name = controller.text.trim();
          if (name.isEmpty) return;
          Navigator.of(dialogContext).pop(name);
        }

        return AlertDialog(
          title: const Text('Rename shortcut'),
          content: TextField(
            controller: controller,
            autofocus: true,
            maxLength: 32,
            textInputAction: TextInputAction.done,
            decoration: const InputDecoration(
              labelText: 'Home label',
              helperText: 'Only the Home label changes.',
            ),
            onSubmitted: (_) => submit(),
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.of(dialogContext).pop(),
              child: const Text('Cancel'),
            ),
            FilledButton(onPressed: submit, child: const Text('Save')),
          ],
        );
      },
    );
  } finally {
    controller.dispose();
  }
}

Future<void> showPinnedIconPicker(
  BuildContext context,
  SlotAssignment assignment,
) {
  return showModalBottomSheet<void>(
    context: context,
    isScrollControlled: true,
    backgroundColor: Colors.transparent,
    barrierColor: _sheetBarrier,
    builder: (_) => _PinnedIconSheet(assignment: assignment),
  );
}

class _PinnedIconSheet extends StatelessWidget {
  const _PinnedIconSheet({required this.assignment});

  final SlotAssignment assignment;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    final theme = Theme.of(context);
    final selectedAsset = assignment.iconAsset;

    return 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, 8),
            child: Row(
              children: [
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text('Change icon', style: theme.textTheme.headlineSmall),
                      const SizedBox(height: 3),
                      Text(
                        'Choose a stylized icon for ${assignment.label}.',
                        maxLines: 1,
                        overflow: TextOverflow.ellipsis,
                        style: theme.textTheme.bodySmall?.copyWith(
                          color: colors.inkMuted,
                        ),
                      ),
                    ],
                  ),
                ),
                Pressable(
                  onTap: () => Navigator.of(context).pop(),
                  semanticLabel: 'Close',
                  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(
                      'assets/icons/x.svg',
                      size: 16,
                      color: colors.inkMuted,
                    ),
                  ),
                ),
              ],
            ),
          ),
          const SizedBox(height: 8),
          Expanded(
            child: GridView.builder(
              padding: const EdgeInsets.fromLTRB(24, 4, 24, 28),
              gridDelegate: const SliverGridDelegateWithMaxCrossAxisExtent(
                maxCrossAxisExtent: 116,
                mainAxisExtent: 108,
                crossAxisSpacing: 10,
                mainAxisSpacing: 10,
              ),
              itemCount: styleIconChoices.length + 1,
              itemBuilder: (context, index) {
                final isDefault = index == 0;
                final choice = isDefault ? null : styleIconChoices[index - 1];
                final asset = isDefault
                    ? 'assets/icons/app-window.svg'
                    : choice!.asset;
                final label = isDefault ? 'Default' : choice!.label;
                final selected = isDefault
                    ? !assignment.hasCustomIcon
                    : selectedAsset == asset;

                return Material(
                  color: Colors.transparent,
                  child: InkWell(
                    borderRadius: BorderRadius.circular(24),
                    onTap: () async {
                      final launcher = context.read<LauncherController>();
                      await launcher.setPinnedIcon(
                        assignment,
                        isDefault ? null : asset,
                      );
                      if (context.mounted) Navigator.of(context).pop();
                    },
                    child: Container(
                      padding: const EdgeInsets.fromLTRB(8, 10, 8, 8),
                      decoration: BoxDecoration(
                        color: colors.surfaceStrong,
                        borderRadius: BorderRadius.circular(24),
                        border: Border.all(
                          color: selected ? colors.accent : colors.border,
                          width: selected ? 1.8 : 1,
                        ),
                      ),
                      child: Column(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          AppIcon(
                            asset,
                            size: 30,
                            color: selected ? colors.accent : colors.ink,
                          ),
                          const SizedBox(height: 7),
                          Text(
                            label,
                            maxLines: 1,
                            overflow: TextOverflow.ellipsis,
                            textAlign: TextAlign.center,
                            style: theme.textTheme.bodySmall?.copyWith(
                              color: selected ? colors.accent : colors.ink,
                              fontWeight: selected
                                  ? FontWeight.w600
                                  : FontWeight.w400,
                            ),
                          ),
                        ],
                      ),
                    ),
                  ),
                );
              },
            ),
          ),
        ],
      ),
    );
  }
}

class _MenuAction extends StatelessWidget {
  const _MenuAction({
    required this.iconAsset,
    required this.title,
    required this.onTap,
    this.danger = false,
  });

  final String iconAsset;
  final String title;
  final VoidCallback onTap;
  final bool danger;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    final theme = Theme.of(context);
    final color = danger ? colors.danger : colors.ink;

    return Pressable(
      onTap: onTap,
      semanticLabel: title,
      pressedScale: 0.98,
      child: Padding(
        padding: const EdgeInsets.symmetric(vertical: 6),
        child: Row(
          children: [
            Container(
              width: 38,
              height: 38,
              decoration: BoxDecoration(
                color: danger
                    ? colors.danger.withValues(alpha: 0.1)
                    : colors.surfaceStrong,
                borderRadius: BorderRadius.circular(13),
                border: Border.all(
                  color: danger
                      ? colors.danger.withValues(alpha: 0.22)
                      : colors.border,
                ),
              ),
              alignment: Alignment.center,
              child: AppIcon(
                iconAsset,
                size: 17,
                color: danger ? colors.danger : colors.inkMuted,
              ),
            ),
            const SizedBox(width: 14),
            Expanded(
              child: Text(
                title,
                style: theme.textTheme.bodyLarge?.copyWith(
                  color: color,
                  fontWeight: FontWeight.w500,
                ),
              ),
            ),
            AppIcon(
              'assets/icons/chevron-right.svg',
              size: 16,
              color: danger
                  ? colors.danger.withValues(alpha: 0.7)
                  : colors.inkFaint,
            ),
          ],
        ),
      ),
    );
  }
}