// Author: fruit.com.cn

import 'dart:async';

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

import '../../core/data/models/product.dart';
import '../../core/data/repositories/store_repository.dart';
import '../../core/data/services/store_controller.dart';
import '../../core/formatting/error_text.dart';
import '../../core/theme/app_colors.dart';
import '../../core/theme/app_dimens.dart';
import '../../core/theme/app_theme.dart';
import '../../core/widgets/empty_state.dart';
import '../../core/widgets/plain_page_scaffold.dart';
import '../../l10n/app_localizations.dart';

/// 商品货架：金币包与会员档位共用一套真实接口渲染。
class StorePage extends StatefulWidget {
  const StorePage({
    super.key,
    required this.type,
    this.repository,
    this.onPurchased,
  });

  final String type;
  final StoreRepository? repository;
  final VoidCallback? onPurchased;

  @override
  State<StorePage> createState() => _StorePageState();
}

class _StorePageState extends State<StorePage> {
  late final StoreController controller;

  @override
  void initState() {
    super.initState();
    controller = StoreController(
      widget.repository ?? context.read<StoreRepository>(),
      type: widget.type,
    );
    unawaited(controller.load());
  }

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

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    final isVip = widget.type == StoreController.vipType;
    return Theme(
      data: AppTheme.dark(),
      child: PlainPageScaffold(
        pageKey: const Key('store-page'),
        backKey: const Key('store-back'),
        title: isVip ? l10n.vipTitle : l10n.rechargeTitle,
        child: ListenableBuilder(
          listenable: controller,
          builder: (context, _) => _body(l10n, isVip),
        ),
      ),
    );
  }

  Widget _body(AppLocalizations l10n, bool isVip) {
    if (controller.loading && controller.products.isEmpty) {
      return const Center(
        child: CircularProgressIndicator(key: Key('store-loading')),
      );
    }
    if (controller.error != null && controller.products.isEmpty) {
      return EmptyState(
        key: const Key('store-error'),
        icon: Icons.cloud_off_rounded,
        title: errorText(l10n, controller.error, l10n.productsLoadFailed),
        actionLabel: l10n.retry,
        actionKey: const Key('store-retry'),
        onAction: () => unawaited(controller.load()),
      );
    }
    if (controller.products.isEmpty) {
      return EmptyState(
        key: const Key('store-empty'),
        icon: isVip ? Icons.workspace_premium_outlined : Icons.savings_outlined,
        title: isVip ? l10n.noVipPlans : l10n.noCoinPacks,
      );
    }
    return ListView.separated(
      padding: const EdgeInsets.fromLTRB(16, 12, 16, 28),
      itemCount: controller.products.length,
      separatorBuilder: (_, _) => const SizedBox(height: 12),
      itemBuilder: (context, index) => _ProductTile(
        product: controller.products[index],
        purchasing:
            controller.purchasingProductId == controller.products[index].id,
        onBuy: () => _buy(controller.products[index]),
      ),
    );
  }

  Future<void> _buy(AppProduct product) async {
    final order = await controller.buy(product);
    if (!mounted) return;
    final l10n = AppLocalizations.of(context)!;
    if (order == null) {
      final message = errorText(
        l10n,
        controller.purchaseError,
        l10n.orderCreateFailed,
      );
      ScaffoldMessenger.of(
        context,
      ).showSnackBar(SnackBar(content: Text(message)));
      return;
    }
    widget.onPurchased?.call();
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(
          '${l10n.orderCreated(order.orderNo)} ${l10n.paymentPending}',
        ),
      ),
    );
  }
}

class _ProductTile extends StatelessWidget {
  const _ProductTile({
    required this.product,
    required this.purchasing,
    required this.onBuy,
  });

  final AppProduct product;
  final bool purchasing;
  final VoidCallback onBuy;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    return Container(
      key: Key('store-product-${product.id}'),
      padding: const EdgeInsets.fromLTRB(14, 14, 12, 14),
      decoration: BoxDecoration(
        color: AppColors.card,
        borderRadius: BorderRadius.circular(AppDimens.cardRadius),
        border: Border.all(color: AppColors.border),
      ),
      child: Row(
        children: [
          _ProductBadge(vip: product.isVip),
          const SizedBox(width: 12),
          Expanded(child: _info(l10n)),
          const SizedBox(width: 10),
          _price(l10n),
        ],
      ),
    );
  }

  Widget _info(AppLocalizations l10n) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          product.name,
          key: Key('store-product-name-${product.id}'),
          maxLines: 1,
          overflow: TextOverflow.ellipsis,
          style: const TextStyle(
            color: AppColors.onSurface,
            fontSize: 14,
            fontWeight: FontWeight.w800,
          ),
        ),
        const SizedBox(height: 4),
        Text(
          _detail(l10n),
          style: const TextStyle(color: AppColors.muted, fontSize: 11),
        ),
      ],
    );
  }

  Widget _price(AppLocalizations l10n) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.end,
      children: [
        Text(
          product.displayPrice,
          key: Key('store-product-price-${product.id}'),
          style: const TextStyle(
            color: AppColors.gold,
            fontSize: 13,
            fontWeight: FontWeight.w800,
          ),
        ),
        const SizedBox(height: 8),
        SizedBox(
          width: 88,
          height: 32,
          child: FilledButton(
            key: Key('store-buy-${product.id}'),
            onPressed: purchasing ? null : onBuy,
            style: FilledButton.styleFrom(
              backgroundColor: AppColors.blue,
              foregroundColor: AppColors.onPrimary,
              padding: EdgeInsets.zero,
              textStyle: const TextStyle(
                fontSize: 11,
                fontWeight: FontWeight.w700,
              ),
            ),
            child: purchasing ? _buyProgress() : Text(l10n.buy),
          ),
        ),
      ],
    );
  }

  Widget _buyProgress() {
    return const SizedBox(
      width: 14,
      height: 14,
      child: CircularProgressIndicator(
        strokeWidth: 2,
        color: AppColors.onPrimary,
      ),
    );
  }

  String _detail(AppLocalizations l10n) {
    if (product.isVip) return l10n.vipDuration(product.vipDays);
    final base = l10n.walletBalanceShort(product.coinAmount);
    if (product.bonusCoin <= 0) return base;
    return '$base · ${l10n.bonusCoin(product.bonusCoin)}';
  }
}

class _ProductBadge extends StatelessWidget {
  const _ProductBadge({required this.vip});

  final bool vip;

  @override
  Widget build(BuildContext context) {
    return Container(
      width: 46,
      height: 46,
      decoration: BoxDecoration(
        color: AppColors.goldCard,
        borderRadius: BorderRadius.circular(13),
      ),
      child: Icon(
        vip ? Icons.workspace_premium_rounded : Icons.monetization_on_rounded,
        color: AppColors.gold,
        size: AppDimens.sectionTitle,
      ),
    );
  }
}