import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import '../../../../core/theme/app_theme.dart';
import '../../../../core/widgets/glass_container.dart';
import '../../../../core/widgets/shimmer_loading.dart';
import '../../bloc/fundamentals/asset_fundamentals_bloc.dart';
import '../../bloc/fundamentals/asset_fundamentals_event.dart';
import '../../bloc/fundamentals/asset_fundamentals_state.dart';
import '../../widgets/fundamentals/analyst_price_target_card.dart';
import '../../widgets/fundamentals/fundamental_category_panels.dart';
import '../../widgets/fundamentals/company_profile_section.dart';

class FundamentalsTab extends StatelessWidget {
  final String isin;
  final String? symbol;
  final bool isEmbedded;

  const FundamentalsTab({
    super.key,
    this.symbol,
    this.isEmbedded = false,
    required this.isin,
  });

  String _getCurrencySymbol(String? ticker) {
    if (ticker == null || ticker.isEmpty) return '€';
    final t = ticker.toUpperCase();
    if (t.endsWith('.DE') || t.endsWith('.F') || t.endsWith('.VI') || t.endsWith('.PA') || t.endsWith('.AS') || t.endsWith('.MC') || t.endsWith('.MI')) {
      return '€';
    }
    if (t.endsWith('.L')) return '£';
    if (t.endsWith('.TO') || t.endsWith('.V')) return 'CA\$';
    return '\$';
  }

  String _getCurrencyCode(String? ticker) {
    if (ticker == null || ticker.isEmpty) return 'EUR';
    final t = ticker.toUpperCase();
    if (t.endsWith('.DE') || t.endsWith('.F') || t.endsWith('.VI') || t.endsWith('.PA') || t.endsWith('.AS') || t.endsWith('.MC') || t.endsWith('.MI')) {
      return 'EUR';
    }
    if (t.endsWith('.L')) return 'GBP';
    if (t.endsWith('.TO') || t.endsWith('.V')) return 'CAD';
    return 'USD';
  }

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<AssetFundamentalsBloc, AssetFundamentalsState>(
      builder: (context, state) {
        if (state is AssetFundamentalsLoading) {
          return _buildFundamentalsShimmer(context);
        }

        if (state is AssetFundamentalsError) {
          return Center(
            child: GlassContainer(
              padding: const EdgeInsets.all(24),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Icon(Icons.error_outline, color: AppTheme.accentRed, size: 48),
                  const SizedBox(height: 12),
                  Text('Fehler beim Laden der Fundamentaldaten: ${state.message}', style: const TextStyle(color: Colors.white70)),
                  const SizedBox(height: 16),
                  ElevatedButton.icon(
                    onPressed: () => context.read<AssetFundamentalsBloc>().add(LoadAssetFundamentals(isin, ticker: symbol, forceRefresh: true)),
                    icon: const Icon(Icons.refresh),
                    label: const Text('Erneut versuchen'),
                  ),
                ],
              ),
            ),
          );
        }

        if (state is AssetFundamentalsLoaded && state.data != null) {
          final data = state.data!;
          final sym = _getCurrencySymbol(data.ticker);
          final curCode = _getCurrencyCode(data.ticker);

          return SingleChildScrollView(
            physics: isEmbedded ? const NeverScrollableScrollPhysics() : null,
            padding: const EdgeInsets.all(16),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                // 1. Analyst Forecasts & Price Targets Header Card
                AnalystPriceTargetCard(data: data, currencySymbol: sym),
                const SizedBox(height: 20),

                // 2. Responsive Side-by-Side Category List Panels (Valuation, Profitability, Dividends)
                FundamentalCategoryPanels(data: data, currencySymbol: sym, currencyCode: curCode),
                const SizedBox(height: 20),

                // 3. Company Description & Detailed Executive Board
                _buildSectionHeader('Unternehmensprofil & Führungskräfte', Icons.business_outlined),
                const SizedBox(height: 12),
                CompanyProfileSection(data: data, currencySymbol: sym),
              ],
            ),
          );
        }

        return _buildEmptyState(context);
      },
    );
  }

  Widget _buildSectionHeader(String title, IconData icon) {
    return Row(
      children: [
        Icon(icon, color: AppTheme.primaryEmerald, size: 20),
        const SizedBox(width: 8),
        Text(title, style: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold, color: Colors.white)),
      ],
    );
  }

  Widget _buildEmptyState(BuildContext context) {
    return Center(
      child: GlassContainer(
        padding: const EdgeInsets.all(24),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(Icons.analytics_outlined, color: AppTheme.textMuted, size: 48),
            const SizedBox(height: 12),
            const Text('Keine Fundamentaldaten verfügbar.', style: TextStyle(color: Colors.white70)),
            const SizedBox(height: 16),
            ElevatedButton.icon(
              onPressed: () => context.read<AssetFundamentalsBloc>().add(LoadAssetFundamentals(isin, ticker: symbol, forceRefresh: true)),
              icon: const Icon(Icons.refresh),
              label: const Text('Aktualisieren'),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildFundamentalsShimmer(BuildContext context) {
    final isDesktop = MediaQuery.of(context).size.width >= 1050;
    final isTablet = MediaQuery.of(context).size.width >= 680 && MediaQuery.of(context).size.width < 1050;

    Widget panelShimmer() {
      return GlassContainer(
        padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 14),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const ShimmerLoading(width: 180, height: 18, borderRadius: 6),
            const SizedBox(height: 12),
            const Divider(color: Colors.white10, height: 1),
            const SizedBox(height: 8),
            for (int i = 0; i < 9; i++) ...[
              Padding(
                padding: const EdgeInsets.symmetric(vertical: 6, horizontal: 4),
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: const [
                    ShimmerLoading(width: 100, height: 14, borderRadius: 4),
                    ShimmerLoading(width: 60, height: 14, borderRadius: 4),
                  ],
                ),
              ),
            ],
          ],
        ),
      );
    }

    return SingleChildScrollView(
      physics: isEmbedded ? const NeverScrollableScrollPhysics() : null,
      padding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          const ShimmerLoading(width: double.infinity, height: 86, borderRadius: 16),
          const SizedBox(height: 20),
          if (isDesktop)
            Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Expanded(child: panelShimmer()),
                const SizedBox(width: 14),
                Expanded(child: panelShimmer()),
                const SizedBox(width: 14),
                Expanded(child: panelShimmer()),
              ],
            )
          else if (isTablet)
            Column(
              children: [
                Row(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Expanded(child: panelShimmer()),
                    const SizedBox(width: 12),
                    Expanded(child: panelShimmer()),
                  ],
                ),
                const SizedBox(height: 12),
                panelShimmer(),
              ],
            )
          else
            Column(
              children: [
                panelShimmer(),
                const SizedBox(height: 12),
                panelShimmer(),
                const SizedBox(height: 12),
                panelShimmer(),
              ],
            ),
          const SizedBox(height: 20),
          const ShimmerLoading(width: 220, height: 20, borderRadius: 6),
          const SizedBox(height: 12),
          const ShimmerLoading(width: double.infinity, height: 140, borderRadius: 16),
        ],
      ),
    );
  }
}