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

class ConfigField {
  final String name;
  final String type;
  final TextEditingController controller;
  // There should be an additional property to indicate whether this field is deactivated/removed/reset
  // meaning it will be set as 'null' (default) rather than any string, otherwise only an empty string can be set

  ConfigField({required this.name, required this.type, required this.controller});
}

class AgentScreen extends StatefulWidget {
  final int agentId;

  AgentScreen({required this.agentId});

  @override
  _AgentScreenState createState() => _AgentScreenState();
}

class _AgentScreenState extends State<AgentScreen> {
  String? _title;
  final TextEditingController nameController = TextEditingController();
  String description = "";
  List<ConfigField> configFields = [];

  @override
  void initState() {
    super.initState();
    _loadAgentInfo();
    _loadConfigFields();
  }

  void _loadAgentInfo() async {
    final agentsResponse = await Backend.sendAction('get-agents', {});
    var agentEntry = null;
    for (var entry in agentsResponse['agents']) {
      if (entry['id'] == widget.agentId) {
        agentEntry = entry;
      }
    }

    if (agentEntry == null) {
      print("Agent ${widget.agentId} not found in agents list");
      return;
    }

    final kindResponse = await Backend.sendAction('get-agent-kind-info', {'kind': agentEntry['kind']});
    setState(() {
      description = kindResponse['info']['description'];
    });
  }

  void _loadConfigFields() async {
    final response = await Backend.sendAction('get-agent-config-fields', {'agentId': widget.agentId});
    setState(() {
      configFields = response['fields'].map((jsonField) {
        return ConfigField(
          name: jsonField['name'],
          type: jsonField['type'],
          controller: TextEditingController(text: jsonField['value']),
        );
      }).toList();
    });
  }

  void _saveChanges() async {
    // Backend.invalidateCache(agent: true);
    final dataObject = {};
    for (var configField in configFields) {
      dataObject[configField.name] = configField.controller.text;
    }
    await Backend.sendAction("update-agent", {
      'agentId': widget.agentId,
      'data': dataObject,
    });
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text('Agent Updated.')),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_title?? 'Agent ${widget.agentId}'),
        actions: [
          IconButton(icon: Icon(Icons.settings), onPressed: () {
            Navigator.push(context, MaterialPageRoute(builder: (_) => AppMenu()));
          }),
        ],
      ),
      body: Center(
        child: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            children: [
              Padding(
                padding: const EdgeInsets.only(bottom: 8.0),
                child: Align(
                  alignment: Alignment.centerLeft,
                  child: Text(description),
                )
              ),
              ListView.builder(
                shrinkWrap: true,
                itemCount: configFields.length,
                itemBuilder: (context, index) {
                  return Padding(
                    padding: const EdgeInsets.only(bottom: 8.0),
                    child: TextField(
                      keyboardType: TextInputType.multiline,
                      minLines: 1,
                      maxLines: 8,
                      controller: configFields[index].controller,
                      decoration: InputDecoration(labelText: configFields[index].name),
                    ),
                  );
                },
              ),
              SizedBox(height: 20),
              ElevatedButton(
                onPressed: _saveChanges,
                child: Text('Save'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}