import 'dart:async';

import 'package:flutter/material.dart';

import 'package:notas/models/category.dart';
import 'package:notas/theme/app_palette.dart';
import 'package:notas/widgets/category_style.dart';

const String kCreateCategoryMenuValue = '__create_category__';

class CategoryMenuButton extends StatelessWidget {
  const CategoryMenuButton({
    super.key,
    required this.categories,
    required this.selectedCategoryId,
    required this.onCategorySelected,
    this.onCreateCategory,
    this.onEditCategory,
    this.icon = Icons.filter_alt_outlined,
    this.tooltip = 'Filtrar por categorías',
    this.isActive = false,
    this.allowCreateCategory = false,
    this.emptyLabel = 'Todas las categorías',
    this.createLabel = 'Crear categoría',
    this.backgroundColor,
  });

  final List<Category> categories;
  final String? selectedCategoryId;
  final ValueChanged<String?> onCategorySelected;
  final FutureOr<void> Function()? onCreateCategory;
  final FutureOr<void> Function(Category category)? onEditCategory;
  final IconData icon;
  final String tooltip;
  final bool isActive;
  final bool allowCreateCategory;
  final String emptyLabel;
  final String createLabel;
  final Color? backgroundColor;

  @override
  Widget build(BuildContext context) {
    final AppPalette palette = Theme.of(context).extension<AppPalette>() ??
        AppPalette.fromBrightness(Theme.of(context).brightness);

    return IconButton(
      onPressed: () async {
        final String? selectedValue = await showCategorySelectionMenu(
          anchorContext: context,
          categories: categories,
          selectedCategoryId: selectedCategoryId,
          allowCreateCategory: allowCreateCategory,
          emptyLabel: emptyLabel,
          createLabel: createLabel,
          onEditCategory: onEditCategory,
        );

        if (selectedValue == null) {
          return;
        }

        if (selectedValue == kCreateCategoryMenuValue) {
          await onCreateCategory?.call();
          return;
        }

        onCategorySelected(selectedValue.isEmpty ? null : selectedValue);
      },
      tooltip: tooltip,
      iconSize: 24,
      style: IconButton.styleFrom(
        backgroundColor: backgroundColor ??
            (isActive ? palette.accent.withValues(alpha: 0.08) : Colors.transparent),
        shape: const CircleBorder(),
      ),
      icon: Stack(
        clipBehavior: Clip.none,
        children: [
          Icon(icon, color: palette.textSecondary),
          if (isActive)
            Positioned(
              right: -1,
              top: -1,
              child: Container(
                width: 7,
                height: 7,
                decoration: BoxDecoration(
                  color: palette.accent,
                  shape: BoxShape.circle,
                ),
              ),
            ),
        ],
      ),
    );
  }
}

Future<String?> showCategorySelectionMenu({
  required BuildContext anchorContext,
  required List<Category> categories,
  required String? selectedCategoryId,
  required bool allowCreateCategory,
  required String emptyLabel,
  required String createLabel,
  FutureOr<void> Function(Category category)? onEditCategory,
}) {
  return showMenu<String?>(
    context: anchorContext,
    position: _menuRectFromContext(anchorContext),
    elevation: 10,
    color: _paletteOf(anchorContext).surfaceElevated,
    shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(14)),
    items: <PopupMenuEntry<String?>>[
      PopupMenuItem<String?>(
        value: '',
        child: _buildCategoryMenuItem(
          context: anchorContext,
          label: emptyLabel,
          icon: allowCreateCategory
              ? Icons.folder_outlined
              : Icons.filter_alt_outlined,
          color: _paletteOf(anchorContext).textSecondary,
          selected: selectedCategoryId == null,
        ),
      ),
      const PopupMenuDivider(),
      for (final Category category in categories)
        PopupMenuItem<String?>(
          value: category.id,
          child: Builder(
            builder: (BuildContext menuContext) {
              final Color categoryColor = Color(
                category.colorValue ?? _paletteOf(menuContext).accent.toARGB32(),
              );

              return _buildCategoryMenuItem(
                context: menuContext,
                label: category.name,
                icon: CategoryStyle.iconForCodePoint(category.iconCodePoint),
                color: categoryColor,
                selected: selectedCategoryId == category.id,
                onEditPressed: onEditCategory == null
                    ? null
                    : () {
                        Navigator.of(menuContext).pop();
                        final FutureOr<void> result = onEditCategory(category);
                        if (result is Future<void>) {
                          unawaited(result);
                        }
                      },
              );
            },
          ),
        ),
      if (allowCreateCategory) ...[
        const PopupMenuDivider(),
        PopupMenuItem<String?>(
          value: kCreateCategoryMenuValue,
          child: _buildCategoryMenuItem(
            context: anchorContext,
            label: createLabel,
            icon: Icons.add_circle_outline,
            color: _paletteOf(anchorContext).textSecondary,
            selected: false,
          ),
        ),
      ],
    ],
  );
}

RelativeRect _menuRectFromContext(BuildContext anchorContext) {
  final RenderBox button = anchorContext.findRenderObject()! as RenderBox;
  final RenderBox overlay =
      Overlay.of(anchorContext).context.findRenderObject()! as RenderBox;
  final Offset topLeft = button.localToGlobal(Offset.zero, ancestor: overlay);
  final Offset bottomRight = button.localToGlobal(
    button.size.bottomRight(Offset.zero),
    ancestor: overlay,
  );

  return RelativeRect.fromRect(
    Rect.fromLTRB(topLeft.dx, topLeft.dy, bottomRight.dx, bottomRight.dy),
    Offset.zero & overlay.size,
  );
}

Widget _buildCategoryMenuItem({
  required BuildContext context,
  required String label,
  required IconData icon,
  required Color color,
  required bool selected,
  VoidCallback? onEditPressed,
}) {
  final AppPalette palette = _paletteOf(context);

  return AnimatedContainer(
    duration: const Duration(milliseconds: 160),
    padding: const EdgeInsets.all(2),
    decoration: BoxDecoration(
      color: selected ? color.withValues(alpha: 0.05) : Colors.transparent,
      borderRadius: BorderRadius.circular(12),
      border: Border.all(
        color: selected ? color.withValues(alpha: 0.42) : Colors.transparent,
        width: 1,
      ),
    ),
    child: Row(
      children: [
        Icon(icon, color: color, size: 20),
        const SizedBox(width: 10),
        Expanded(
          child: Text(
            label,
            overflow: TextOverflow.ellipsis,
            style: TextStyle(
              color: selected ? palette.textPrimary : palette.textSecondary,
              fontWeight: selected ? FontWeight.w600 : FontWeight.w500,
            ),
          ),
        ),
        const SizedBox(width: 8),
        if (onEditPressed != null)
          IconButton(
            padding: EdgeInsets.zero,
            constraints: const BoxConstraints(minWidth: 32, minHeight: 32),
            icon: Icon(
              Icons.more_vert,
              size: 18,
              color: palette.textSecondary,
            ),
            onPressed: onEditPressed,
          ),
      ],
    ),
  );
}

AppPalette _paletteOf(BuildContext context) {
  return Theme.of(context).extension<AppPalette>() ??
      AppPalette.fromBrightness(Theme.of(context).brightness);
}