import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:intl/intl.dart';
import '../../models/project_model.dart';
import '../../models/task_log_model.dart';
import '../../services/project_service.dart';
import '../../services/task_log_service.dart';
import '../project_detail_screen.dart';
import '../project_form_screen.dart';

class ProjectsTab extends StatelessWidget {
  const ProjectsTab({super.key});

  @override
  Widget build(BuildContext context) {
    final service = context.read<ProjectService>();

    return Scaffold(
      backgroundColor: const Color(0xFFF8FAFC),
      body: StreamBuilder<List<ProjectModel>>(
        stream: service.getProjects(),
        builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            return const Center(child: CircularProgressIndicator());
          }
          final projects = snapshot.data ?? [];
          
          if (projects.isEmpty) {
            return Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                   Icon(Icons.folder_open_rounded, size: 100, color: Colors.grey.shade200),
                   const SizedBox(height: 16),
                   Text("No projects assigned yet.", style: TextStyle(color: Colors.grey.shade500, fontSize: 13)),
                   const SizedBox(height: 24),
                   ElevatedButton(
                     onPressed: () => Navigator.push(
                       context, 
                       MaterialPageRoute(builder: (_) => const ProjectFormScreen())
                     ), 
                     style: ElevatedButton.styleFrom(minimumSize: const Size(200, 50)),
                     child: const Text("CREATE FIRST PROJECT"),
                   ),
                ],
              ),
            );
          }
          
          return CustomScrollView(
            slivers: [
              const SliverPadding(
                padding: EdgeInsets.fromLTRB(20, 20, 20, 10),
                sliver: SliverToBoxAdapter(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        "Workspace",
                        style: TextStyle(fontSize: 14, color: Color(0xFF64748B), fontWeight: FontWeight.w500),
                      ),
                      Text(
                        "Projects",
                        style: TextStyle(fontSize: 28, fontWeight: FontWeight.bold, color: Color(0xFF1E293B)),
                      ),
                    ],
                  ),
                ),
              ),
              SliverPadding(
                padding: const EdgeInsets.all(20),
                sliver: SliverList(
                  delegate: SliverChildBuilderDelegate(
                    (context, index) => _ProjectCard(p: projects[index]),
                    childCount: projects.length,
                  ),
                ),
              ),
            ],
          );
        },
      ),
      floatingActionButton: FloatingActionButton.extended(
        heroTag: "projects_fab",
        backgroundColor: const Color(0xFF6366F1),
        onPressed: () => Navigator.push(
          context, 
          MaterialPageRoute(builder: (_) => const ProjectFormScreen())
        ),
        label: const Text("NEW PROJECT", style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold)),
        icon: const Icon(Icons.add_rounded, color: Colors.white),
      ),
    );
  }
}

class _ProjectCard extends StatelessWidget {
  final ProjectModel p;
  const _ProjectCard({required this.p});

  @override
  Widget build(BuildContext context) {
    final taskService = context.watch<TaskLogService>();

    return Container(
      margin: const EdgeInsets.only(bottom: 16),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(24),
        border: Border.all(color: Colors.grey.shade100),
        boxShadow: [
          BoxShadow(
            color: Colors.indigo.withOpacity(0.02),
            blurRadius: 10,
            offset: const Offset(0, 4),
          ),
        ],
      ),
      child: InkWell(
        onTap: () => Navigator.push(
          context, 
          MaterialPageRoute(builder: (_) => ProjectDetailScreen(project: p))
        ),
        borderRadius: BorderRadius.circular(24),
        child: Padding(
          padding: const EdgeInsets.all(24),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  Container(
                    padding: const EdgeInsets.all(10),
                    decoration: BoxDecoration(
                      color: const Color(0xFF6366F1).withOpacity(0.1),
                      borderRadius: BorderRadius.circular(12),
                    ),
                    child: const Icon(Icons.folder_copy_rounded, color: Color(0xFF6366F1), size: 24),
                  ),
                  const SizedBox(width: 16),
                  Expanded(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          p.name, 
                          style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 18, color: Color(0xFF1E293B)),
                        ),
                        Text(
                          "Created ${DateFormat('MMM yyyy').format(p.createdAt)}",
                          style: TextStyle(color: Colors.grey.shade500, fontSize: 11),
                        ),
                      ],
                    ),
                  ),
                  const Icon(Icons.chevron_right_rounded, color: Color(0xFF94A3B8)),
                ],
              ),
              const SizedBox(height: 16),
              Text(
                p.description,
                maxLines: 2,
                overflow: TextOverflow.ellipsis,
                style: const TextStyle(color: Color(0xFF475569), fontSize: 13, height: 1.5),
              ),
              const SizedBox(height: 16),
              if (p.flavors.isNotEmpty) ...[
                Wrap(
                  spacing: 6,
                  runSpacing: 6,
                  children: p.flavors.map((flavor) => Container(
                    padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 4),
                    decoration: BoxDecoration(
                      color: const Color(0xFFF1F5F9),
                      borderRadius: BorderRadius.circular(8),
                    ),
                    child: Text(
                      flavor,
                      style: const TextStyle(fontSize: 10, fontWeight: FontWeight.bold, color: Color(0xFF64748B)),
                    ),
                  )).toList(),
                ),
                const SizedBox(height: 20),
              ],
              FutureBuilder<TaskLogModel?>(
                future: taskService.getLatestLogForProject(p.id),
                builder: (context, snapshot) {
                  if (snapshot.hasError) {
                    return const Text(
                      "Index Error. Click project for link.", 
                      style: TextStyle(fontSize: 10, color: Colors.red, fontWeight: FontWeight.bold)
                    );
                  }
                  final latestLog = snapshot.data;
                  if (latestLog == null) {
                    return const Text(
                      "No activity recorded yet.", 
                      style: TextStyle(fontSize: 11, color: Color(0xFF94A3B8), fontStyle: FontStyle.italic)
                    );
                  }
                  
                  return Container(
                    padding: const EdgeInsets.all(12),
                    decoration: BoxDecoration(
                      color: const Color(0xFFF8FAFC),
                      borderRadius: BorderRadius.circular(12),
                    ),
                    child: Row(
                      children: [
                        const Icon(Icons.auto_awesome_rounded, size: 14, color: Colors.amber),
                        const SizedBox(width: 8),
                        Expanded(
                          child: Text(
                            "Latest: ${latestLog.userName} on ${DateFormat('MM/dd').format(latestLog.date)}",
                            style: const TextStyle(fontSize: 11, fontWeight: FontWeight.bold, color: Color(0xFF334155)),
                          ),
                        ),
                        Text(
                          latestLog.moduleName, 
                          style: const TextStyle(fontSize: 10, color: Color(0xFF64748B)),
                        ),
                      ],
                    ),
                  );
                },
              ),
            ],
          ),
        ),
      ),
    );
  }
}