import 'package:flutter/material.dart';
import 'backend.dart';
import 'chat_screen.dart';
import 'agent_screen.dart';

class AgentEntry {
  final int id;
  final String name;

  AgentEntry({required this.id, required this.name});
}

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

  static Future<List<AgentEntry>> getChats() async {
    final response = await Backend.sendAction("get-agents", {});
    List<dynamic> chatObjects = response['agents'];
    List<AgentEntry> chats = chatObjects
        .map((msg) => AgentEntry(
              id: msg['id'],
              name: msg['name']?.isNotEmpty == true ? msg['name'] : '[Agent ${msg['id']}]',
            ))
        .toList();
    return chats;
  }

  static Future<List<String>> getAgentKinds() async {
    final response = await Backend.sendAction("get-agent-kinds", {});
    return response['kinds'];
  }

  // Function to create a new agent and navigate
  Future<void> createAgent(BuildContext context, String name, String kind) async {
    try {
      // Pass the 'kind' to the backend as well
      final response = await Backend.sendAction("create-agent", {"name": name, "kind": kind});
      final int newAgentId = response['agentId']; // Assuming your backend returns the new agent's ID

      if (context.mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Agent $name created.')),
        );
        // Navigate to the new agent's chat screen
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) => AgentScreen(agentId: newAgentId),
          ),
        );
      }
    } catch (e) {
      if (context.mounted) {
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Failed to create agent: $e')),
        );
      }
    }
  }

  // Function to show the create agent dialog
  void _showCreateAgentDialog(BuildContext context) {
    TextEditingController usernameController = TextEditingController();
    String? selectedKind; // To hold the selected kind value

    showDialog(
      context: context,
      builder: (BuildContext dialogContext) {
        return AlertDialog(
          title: const Text('Create New Agent'),
          content: SingleChildScrollView( // Use SingleChildScrollView to prevent overflow
            child: ListBody(
              children: <Widget>[
                TextField(
                  controller: usernameController,
                  decoration: const InputDecoration(hintText: "Enter agent name"),
                ),
                const SizedBox(height: 16.0), // Spacing between fields
                FutureBuilder<List<String>>(
                  future: getAgentKinds(), // Call the asynchronous function to get kinds
                  builder: (context, snapshot) {
                    if (snapshot.connectionState == ConnectionState.waiting) {
                      return const Center(child: CircularProgressIndicator());
                    } else if (snapshot.hasError) {
                      return Center(child: Text('Error loading kinds: ${snapshot.error}'));
                    } else if (!snapshot.hasData || snapshot.data!.isEmpty) {
                      return const Center(child: Text('No agent kinds available.'));
                    } else {
                      final kinds = snapshot.data!;
                      // Ensure a default selection if none is made, or allow null
                      if (selectedKind == null && kinds.isNotEmpty) {
                        selectedKind = kinds.first; // Set the first item as default
                      }
                      return StatefulBuilder( // Use StatefulBuilder to update dropdown state
                        builder: (context, setState) {
                          return DropdownButtonFormField<String>(
                            value: selectedKind,
                            hint: const Text('Select Kind'),
                            decoration: const InputDecoration(
                              labelText: 'Kind',
                              border: OutlineInputBorder(),
                            ),
                            items: kinds.map((String kind) {
                              return DropdownMenuItem<String>(
                                value: kind,
                                child: Text(kind),
                              );
                            }).toList(),
                            onChanged: (String? newValue) {
                              setState(() {
                                selectedKind = newValue;
                              });
                            },
                          );
                        },
                      );
                    }
                  },
                ),
              ],
            ),
          ),
          actions: <Widget>[
            TextButton(
              child: const Text('Cancel'),
              onPressed: () {
                Navigator.of(dialogContext).pop(); // Dismiss the dialog
              },
            ),
            TextButton(
              child: const Text('Create'),
              onPressed: () {
                if (usernameController.text.isNotEmpty && selectedKind != null) {
                  Navigator.of(dialogContext).pop(); // Dismiss the dialog first
                  createAgent(context, usernameController.text, selectedKind!); // Pass selectedKind
                } else {
                  if (dialogContext.mounted) {
                    ScaffoldMessenger.of(dialogContext).showSnackBar(
                      const SnackBar(content: Text('Agent name and kind cannot be empty')),
                    );
                  }
                }
              },
            ),
          ],
        );
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Agents')),
      body: Column(
        children: [
          ListTile(
            leading: const Icon(Icons.add),
            title: const Text('Create'),
            onTap: () => _showCreateAgentDialog(context), // Open the dialog
          ),
          const Divider(height: 1),
          Expanded(
            child: FutureBuilder<List<AgentEntry>>(
              future: getChats(),
              builder: (context, snapshot) {
                if (snapshot.connectionState == ConnectionState.waiting) {
                  return const Center(child: CircularProgressIndicator());
                } else if (snapshot.hasError) {
                  return Center(child: Text('Error: ${snapshot.error}'));
                } else if (!snapshot.hasData || snapshot.data!.isEmpty) {
                  return const Center(child: Text('No agents available.'));
                } else {
                  final agents = snapshot.data!;
                  return ListView.builder(
                    itemCount: agents.length,
                    itemBuilder: (context, index) {
                      final agent = agents[index];
                      return ListTile(
                        title: Text(agent.name),
                        onTap: () {
                          print("Navigate to agent ${agent.id}");
                          Navigator.push(
                            context,
                            MaterialPageRoute(
                              builder: (context) => AgentScreen(agentId: agent.id),
                            ),
                          );
                        },
                      );
                    },
                  );
                }
              },
            ),
          ),
        ],
      ),
    );
  }
}