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

import 'package:pshared/models/payment/wallet.dart';

import 'package:pweb/pages/dashboard/buttons/balance/add/card.dart';
import 'package:pweb/pages/dashboard/buttons/balance/balance_item.dart';
import 'package:pweb/pages/dashboard/buttons/balance/card.dart';
import 'package:pweb/pages/dashboard/buttons/balance/config.dart';
import 'package:pweb/pages/dashboard/buttons/balance/indicator.dart';
import 'package:pweb/pages/dashboard/buttons/balance/ledger.dart';


class BalanceCarousel extends StatefulWidget {
  final List<BalanceItem> items;
  final int currentIndex;
  final ValueChanged<int> onIndexChanged;
  final ValueChanged<Wallet> onTopUp;
  final ValueChanged<Wallet> onWalletTap;

  const BalanceCarousel({
    super.key,
    required this.items,
    required this.currentIndex,
    required this.onIndexChanged,
    required this.onTopUp,
    required this.onWalletTap,
  });

  @override
  State<BalanceCarousel> createState() => _BalanceCarouselState();
}

class _BalanceCarouselState extends State<BalanceCarousel> {
  late final PageController _controller;

  @override
  void initState() {
    super.initState();
    _controller = PageController(
      initialPage: widget.currentIndex,
      viewportFraction: WalletCardConfig.viewportFraction,
    );
  }

  @override
  void didUpdateWidget(covariant BalanceCarousel oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (!mounted) return;
    if (_controller.hasClients) {
      final currentPage = _controller.page?.round();
      if (currentPage != widget.currentIndex) {
        _controller.jumpToPage(widget.currentIndex);
      }
    }
  }

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

  void _goToPage(int index) {
    if (!_controller.hasClients) return;
    _controller.animateToPage(
      index,
      duration: const Duration(milliseconds: 220),
      curve: Curves.easeOut,
    );
  }

  @override
  Widget build(BuildContext context) {
    if (widget.items.isEmpty) {
      return const SizedBox.shrink();
    }

    final safeIndex = widget.currentIndex.clamp(0, widget.items.length - 1);
    final scrollBehavior = ScrollConfiguration.of(context).copyWith(
      dragDevices: const {
        PointerDeviceKind.touch,
        PointerDeviceKind.mouse,
        PointerDeviceKind.trackpad,
      },
    );

    return Column(
      children: [
        SizedBox(
          height: WalletCardConfig.cardHeight,
          child: MouseRegion(
            cursor: SystemMouseCursors.grab,
            child: ScrollConfiguration(
              behavior: scrollBehavior,
              child: PageView.builder(
                controller: _controller,
                onPageChanged: widget.onIndexChanged,
                itemCount: widget.items.length,
                itemBuilder: (context, index) {
                  final item = widget.items[index];
                  final Widget card = switch (item.type) {
                    BalanceItemType.wallet => WalletCard(
                      wallet: item.wallet!,
                      onTopUp: () => widget.onTopUp(item.wallet!),
                      onTap: () => widget.onWalletTap(item.wallet!),
                    ),
                    BalanceItemType.ledger => LedgerAccountCard(account: item.account!),
                    BalanceItemType.addAction => const AddBalanceCard(),
                  };

                  return Padding(
                    padding: WalletCardConfig.cardPadding,
                    child: card,
                  );
                },
              ),
            ),
          ),
        ),
        const SizedBox(height: 16),
        Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            IconButton(
              onPressed: safeIndex > 0
                  ? () => _goToPage(safeIndex - 1)
                  : null,
              icon: const Icon(Icons.arrow_back),
            ),
            const SizedBox(width: 16),
            CarouselIndicator(
              itemCount: widget.items.length,
              index: safeIndex,
            ),
            const SizedBox(width: 16),
            IconButton(
              onPressed: safeIndex < widget.items.length - 1 ? () => _goToPage(safeIndex + 1) : null,
              icon: const Icon(Icons.arrow_forward),
            ),
          ],
        ),
      ],
    );
  }
}