/// Page: Quotes Page
///
/// Displays list of quote requests with search and filter functionality.
library;

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:intl/intl.dart';
import 'package:worker/core/constants/ui_constants.dart';
import 'package:worker/core/database/models/enums.dart';
import 'package:worker/core/theme/colors.dart';
import 'package:worker/features/quotes/data/models/quote_model.dart';
import 'package:worker/features/quotes/presentation/providers/quotes_provider.dart';

/// Quotes Page
///
/// Features:
/// - Search bar for quote numbers and project names
/// - Filter section
/// - List of quote request cards with status indicators
/// - Pull-to-refresh
class QuotesPage extends ConsumerStatefulWidget {
  const QuotesPage({super.key});

  @override
  ConsumerState<QuotesPage> createState() => _QuotesPageState();
}

class _QuotesPageState extends ConsumerState<QuotesPage> {
  final TextEditingController _searchController = TextEditingController();

  @override
  void initState() {
    super.initState();
    _searchController.addListener(_onSearchChanged);
  }

  @override
  void dispose() {
    _searchController
      ..removeListener(_onSearchChanged)
      ..dispose();
    super.dispose();
  }

  void _onSearchChanged() {
    ref
        .read(quoteSearchQueryProvider.notifier)
        .updateQuery(_searchController.text);
  }

  @override
  Widget build(BuildContext context) {
    final filteredQuotesAsync = ref.watch(filteredQuotesProvider);

    return Scaffold(
      backgroundColor: const Color(0xFFF4F6F8),
      appBar: AppBar(
        leading: IconButton(
          icon: const Icon(Icons.arrow_back, color: Colors.black),
          onPressed: () => context.pop(),
        ),
        title: const Text(
          'Yêu cầu báo giá',
          style: TextStyle(color: Colors.black),
        ),
        actions: [
          IconButton(
            icon: const Icon(Icons.add, color: Colors.black),
            onPressed: () {
              // TODO: Navigate to quote create page
              ScaffoldMessenger.of(context).showSnackBar(
                const SnackBar(content: Text('Tạo yêu cầu báo giá mới')),
              );
            },
          ),
        ],
        elevation: AppBarSpecs.elevation,
        backgroundColor: AppColors.white,
        foregroundColor: AppColors.grey900,
        centerTitle: false,
      ),
      body: RefreshIndicator(
        onRefresh: () async {
          await ref.read(quotesProvider.notifier).refresh();
        },
        child: CustomScrollView(
          slivers: [
            // Search Bar and Filter Button
            SliverToBoxAdapter(
              child: Padding(
                padding: const EdgeInsets.all(16),
                child: _buildSearchAndFilterRow(),
              ),
            ),

            // Quotes List
            SliverPadding(
              padding: const EdgeInsets.fromLTRB(16, 0, 16, 24),
              sliver: filteredQuotesAsync.when(
                data: (quotes) {
                  if (quotes.isEmpty) {
                    return _buildEmptyState();
                  }

                  return SliverList(
                    delegate: SliverChildBuilderDelegate((context, index) {
                      final quote = quotes[index];
                      return _buildQuoteCard(quote);
                    }, childCount: quotes.length),
                  );
                },
                loading: () => _buildLoadingState(),
                error: (error, stack) => _buildErrorState(error),
              ),
            ),
          ],
        ),
      ),
    );
  }

  /// Build search bar and filter button row
  Widget _buildSearchAndFilterRow() {
    return Row(
      children: [
        // Search Bar
        Expanded(
          child: Container(
            decoration: BoxDecoration(
              color: AppColors.white,
              borderRadius: BorderRadius.circular(12),
              boxShadow: [
                BoxShadow(
                  color: Colors.black.withValues(alpha: 0.05),
                  blurRadius: 8,
                  offset: const Offset(0, 2),
                ),
              ],
            ),
            child: TextField(
              controller: _searchController,
              decoration: InputDecoration(
                hintText: 'Tìm theo mã yêu cầu hoặc tên dự án',
                hintStyle: const TextStyle(
                  color: AppColors.grey500,
                  fontSize: 14,
                ),
                prefixIcon: const Icon(Icons.search, color: AppColors.grey500),
                suffixIcon: _searchController.text.isNotEmpty
                    ? IconButton(
                        icon: const Icon(Icons.clear, color: AppColors.grey500),
                        onPressed: () {
                          _searchController.clear();
                        },
                      )
                    : null,
                border: InputBorder.none,
                contentPadding: const EdgeInsets.symmetric(
                  horizontal: 16,
                  vertical: 12,
                ),
              ),
            ),
          ),
        ),

        const SizedBox(width: 12),

        // Filter Button
        Container(
          decoration: BoxDecoration(
            color: AppColors.white,
            borderRadius: BorderRadius.circular(12),
            boxShadow: [
              BoxShadow(
                color: Colors.black.withValues(alpha: 0.05),
                blurRadius: 8,
                offset: const Offset(0, 2),
              ),
            ],
          ),
          child: IconButton(
            onPressed: () {
              _showFilterDialog();
            },
            icon: Icon(Icons.filter_list, color: AppColors.primaryBlue),
            iconSize: 24,
            padding: const EdgeInsets.all(12),
            constraints: const BoxConstraints(minWidth: 48, minHeight: 48),
          ),
        ),
      ],
    );
  }

  /// Build quote card
  Widget _buildQuoteCard(QuoteModel quote) {
    final dateFormatter = DateFormat('dd/MM/yyyy');

    return Card(
      margin: const EdgeInsets.only(bottom: 12),
      elevation: 1,
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
      clipBehavior: Clip.antiAlias,
      child: InkWell(
        onTap: () {
          // TODO: Navigate to quote detail
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text('Chi tiết báo giá ${quote.quoteNumber}')),
          );
        },
        child: Padding(
          padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              // Quote ID and Date
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Text(
                    '#${quote.quoteNumber}',
                    style: const TextStyle(
                      fontSize: 16,
                      fontWeight: FontWeight.w700,
                      color: AppColors.grey900,
                    ),
                  ),
                  Text(
                    dateFormatter.format(quote.createdAt),
                    style: const TextStyle(
                      fontSize: 12,
                      color: AppColors.grey500,
                    ),
                  ),
                ],
              ),

              const SizedBox(height: 8),

              // Project Name
              if (quote.projectName != null)
                Text(
                  'Dự án: ${quote.projectName}',
                  style: const TextStyle(
                    fontSize: 14,
                    color: AppColors.grey900,
                  ),
                  maxLines: 1,
                  overflow: TextOverflow.ellipsis,
                ),

              const SizedBox(height: 4),

              // Additional Info (placeholder for now)
              const Text(
                '5 sản phẩm - Diện tích: 200m²',
                style: TextStyle(fontSize: 13, color: AppColors.grey500),
              ),

              const SizedBox(height: 8),

              // Status Badge
              _buildStatusBadge(quote.status),

              const SizedBox(height: 8),

              // Notes
              if (quote.notes != null && quote.notes!.isNotEmpty)
                Text(
                  quote.notes!,
                  style: const TextStyle(
                    fontSize: 13,
                    color: AppColors.grey500,
                    fontStyle: FontStyle.italic,
                  ),
                  maxLines: 2,
                  overflow: TextOverflow.ellipsis,
                ),
            ],
          ),
        ),
      ),
    );
  }

  /// Build status badge
  Widget _buildStatusBadge(QuoteStatus status) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
      decoration: BoxDecoration(
        color: _getStatusColor(status).withValues(alpha: 0.1),
        borderRadius: BorderRadius.circular(12),
        border: Border.all(
          color: _getStatusColor(status).withValues(alpha: 0.3),
          width: 1,
        ),
      ),
      child: Text(
        _getStatusText(status),
        style: TextStyle(
          fontSize: 12,
          fontWeight: FontWeight.w600,
          color: _getStatusColor(status),
        ),
      ),
    );
  }

  /// Get status color
  Color _getStatusColor(QuoteStatus status) {
    switch (status) {
      case QuoteStatus.draft:
        return AppColors.warning;
      case QuoteStatus.sent:
        return AppColors.info;
      case QuoteStatus.viewed:
        return const Color(0xFFF59E0B); // yellow/orange
      case QuoteStatus.accepted:
        return AppColors.primaryBlue;
      case QuoteStatus.rejected:
        return AppColors.danger;
      case QuoteStatus.expired:
        return AppColors.grey500;
      case QuoteStatus.converted:
        return AppColors.success;
      case QuoteStatus.cancelled:
        return AppColors.grey500;
    }
  }

  /// Get status text
  String _getStatusText(QuoteStatus status) {
    switch (status) {
      case QuoteStatus.draft:
        return 'Chờ duyệt';
      case QuoteStatus.sent:
        return 'Đã gửi';
      case QuoteStatus.viewed:
        return 'Đang đàm phán';
      case QuoteStatus.accepted:
        return 'Đã chốt';
      case QuoteStatus.rejected:
        return 'Từ chối';
      case QuoteStatus.expired:
        return 'Hết hạn';
      case QuoteStatus.converted:
        return 'Đã thành đơn hàng';
      case QuoteStatus.cancelled:
        return 'Đã hủy';
    }
  }

  /// Show filter dialog
  void _showFilterDialog() {
    showDialog(
      context: context,
      builder: (context) {
        final selectedStatus = ref.read(selectedQuoteStatusProvider);

        return AlertDialog(
          title: const Text('Lọc theo trạng thái'),
          content: SingleChildScrollView(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                _buildFilterOption(
                  context,
                  'Tất cả',
                  null,
                  selectedStatus == null,
                ),
                ...QuoteStatus.values.map((status) {
                  return _buildFilterOption(
                    context,
                    _getStatusText(status),
                    status,
                    selectedStatus == status,
                  );
                }),
              ],
            ),
          ),
          actions: [
            TextButton(
              onPressed: () {
                Navigator.of(context).pop();
              },
              child: const Text('Đóng'),
            ),
          ],
        );
      },
    );
  }

  /// Build filter option
  Widget _buildFilterOption(
    BuildContext context,
    String label,
    QuoteStatus? status,
    bool isSelected,
  ) {
    return RadioListTile<QuoteStatus?>(
      title: Text(label),
      value: status,
      groupValue: ref.watch(selectedQuoteStatusProvider),
      onChanged: (value) {
        ref.read(selectedQuoteStatusProvider.notifier).selectStatus(value);
        Navigator.of(context).pop();
      },
      activeColor: AppColors.primaryBlue,
    );
  }

  /// Build empty state
  Widget _buildEmptyState() {
    return SliverFillRemaining(
      child: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(
              Icons.receipt_long_outlined,
              size: 80,
              color: AppColors.grey500.withValues(alpha: 0.5),
            ),
            const SizedBox(height: 16),
            const Text(
              'Không có yêu cầu báo giá nào',
              style: TextStyle(
                fontSize: 18,
                fontWeight: FontWeight.w600,
                color: AppColors.grey500,
              ),
            ),
            const SizedBox(height: 8),
            const Text(
              'Kéo xuống để làm mới',
              style: TextStyle(fontSize: 14, color: AppColors.grey500),
            ),
          ],
        ),
      ),
    );
  }

  /// Build loading state
  Widget _buildLoadingState() {
    return const SliverFillRemaining(
      child: Center(child: CircularProgressIndicator()),
    );
  }

  /// Build error state
  Widget _buildErrorState(Object error) {
    return SliverFillRemaining(
      child: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(
              Icons.error_outline,
              size: 80,
              color: AppColors.danger.withValues(alpha: 0.7),
            ),
            const SizedBox(height: 16),
            const Text(
              'Có lỗi xảy ra',
              style: TextStyle(
                fontSize: 18,
                fontWeight: FontWeight.w600,
                color: AppColors.grey900,
              ),
            ),
            const SizedBox(height: 8),
            Text(
              error.toString(),
              style: const TextStyle(fontSize: 14, color: AppColors.grey500),
              textAlign: TextAlign.center,
            ),
          ],
        ),
      ),
    );
  }
}