import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:lucide_icons/lucide_icons.dart';
import '../domain/project.dart';
import '../providers/project_provider.dart';
import 'widgets/add_task_sheet.dart';
import 'widgets/task_card.dart';
import 'widgets/add_project_sheet.dart';
import '../../sales/presentation/invoice_builder_screen.dart';
import '../../sales/domain/invoice.dart';

class ProjectBoardScreen extends ConsumerStatefulWidget {
  final Project project;

  const ProjectBoardScreen({super.key, required this.project});

  @override
  ConsumerState<ProjectBoardScreen> createState() => _ProjectBoardScreenState();
}

class _ProjectBoardScreenState extends ConsumerState<ProjectBoardScreen> {
  @override
  Widget build(BuildContext context) {
    final tasksAsync = ref.watch(projectTasksProvider(widget.project.id));

    return Scaffold(
      backgroundColor: Colors.grey[100],
      appBar: AppBar(
        title: Text(
          widget.project.name,
          style: const TextStyle(fontWeight: FontWeight.bold),
        ),
        backgroundColor: Colors.white,
        foregroundColor: Colors.black,
        elevation: 0,
        actions: [
          IconButton(
            icon: const Icon(LucideIcons.info),
            tooltip: 'Project Details',
            onPressed: () {
              showModalBottomSheet(
                context: context,
                isScrollControlled: true,
                backgroundColor: Colors.transparent,
                builder: (context) => AddProjectSheet(project: widget.project),
              );
            },
          ),
        ],
      ),
      body: tasksAsync.when(
        data: (tasks) {
          final columns = [
            _ColumnDef('To Do', 'TODO', Colors.blueGrey, LucideIcons.circle),
            _ColumnDef(
              'In Progress',
              'IN_PROGRESS',
              Colors.blue,
              LucideIcons.loader,
            ),
            _ColumnDef('Review', 'REVIEW', Colors.orange, LucideIcons.eye),
            _ColumnDef('Done', 'DONE', Colors.green, LucideIcons.checkCircle),
          ];

          return SingleChildScrollView(
            scrollDirection: Axis.horizontal,
            padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 8),
            child: Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: columns.map((col) {
                final columnTasks = tasks
                    .where((t) => t.status == col.status)
                    .toList();
                return _buildColumn(
                  col,
                  columnTasks,
                  showAdd: col.status == 'TODO',
                );
              }).toList(),
            ),
          );
        },
        loading: () => const Center(child: CircularProgressIndicator()),
        error: (err, stack) => Center(child: Text('Error: $err')),
      ),
    );
  }

  Widget _buildColumn(_ColumnDef col, List tasks, {bool showAdd = false}) {
    return Container(
      width: 290,
      margin: const EdgeInsets.symmetric(horizontal: 6),
      decoration: BoxDecoration(
        color: col.color.withValues(alpha: 0.04),
        borderRadius: BorderRadius.circular(16),
        border: Border.all(color: col.color.withValues(alpha: 0.12)),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        mainAxisSize: MainAxisSize.min,
        children: [
          // Column header
          Container(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
            decoration: BoxDecoration(
              color: col.color.withValues(alpha: 0.08),
              borderRadius: const BorderRadius.vertical(
                top: Radius.circular(16),
              ),
            ),
            child: Row(
              children: [
                Icon(col.icon, size: 16, color: col.color),
                const SizedBox(width: 8),
                Text(
                  col.label,
                  style: TextStyle(
                    fontWeight: FontWeight.bold,
                    fontSize: 14,
                    color: col.color,
                  ),
                ),
                const SizedBox(width: 8),
                Container(
                  padding: const EdgeInsets.symmetric(
                    horizontal: 8,
                    vertical: 2,
                  ),
                  decoration: BoxDecoration(
                    color: col.color.withValues(alpha: 0.15),
                    borderRadius: BorderRadius.circular(12),
                  ),
                  child: Text(
                    '${tasks.length}',
                    style: TextStyle(
                      fontSize: 12,
                      fontWeight: FontWeight.bold,
                      color: col.color,
                    ),
                  ),
                ),
              ],
            ),
          ),

          // Task cards
          ...tasks.map(
            (t) => TaskCard(
              task: t,
              onEdit: () {
                showModalBottomSheet(
                  context: context,
                  isScrollControlled: true,
                  backgroundColor: Colors.transparent,
                  builder: (_) =>
                      AddTaskSheet(projectId: widget.project.id, task: t),
                );
              },
              onGenerateInvoice: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(
                    builder: (_) => InvoiceBuilderScreen(
                      initialCustomerId: widget.project.customerId,
                      initialItems: [
                        InvoiceItem(
                          id: 0,
                          invoiceId: 0,
                          productId: null,
                          description: t.title,
                          quantity: t.hoursLogged,
                          unitPrice: t.hourlyRate,
                          total: t.hoursLogged * t.hourlyRate,
                        ),
                      ],
                    ),
                  ),
                );
              },
            ),
          ),

          if (showAdd)
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
              child: SizedBox(
                width: double.infinity,
                child: OutlinedButton.icon(
                  style: OutlinedButton.styleFrom(
                    foregroundColor: col.color,
                    side: BorderSide(color: col.color.withValues(alpha: 0.3)),
                    shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(10),
                    ),
                    padding: const EdgeInsets.symmetric(vertical: 10),
                  ),
                  icon: const Icon(LucideIcons.plus, size: 16),
                  label: const Text(
                    'Add Task',
                    style: TextStyle(fontWeight: FontWeight.w600),
                  ),
                  onPressed: () {
                    showModalBottomSheet(
                      context: context,
                      isScrollControlled: true,
                      backgroundColor: Colors.transparent,
                      builder: (_) =>
                          AddTaskSheet(projectId: widget.project.id),
                    );
                  },
                ),
              ),
            ),
          const SizedBox(height: 8),
        ],
      ),
    );
  }
}

class _ColumnDef {
  final String label;
  final String status;
  final Color color;
  final IconData icon;

  const _ColumnDef(this.label, this.status, this.color, this.icon);
}