import 'dart:async';
import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;

class Category {
  final String name;
  List<Device> devices;

  Category(this.name) : devices = [];

  static Future<List<Category>> fetch(String base_url) async {
    final response = await http.get(Uri.parse("$base_url/devices"));

    if (response.statusCode == 200) {
      List<Category> categories = [];

      Map<String, List<Map<String, dynamic>>> json = jsonDecode(response.body);

      for (MapEntry<String, List<Map<String, dynamic>>> category_entry
          in json.entries) {
        Category category = Category(category_entry.key);

        for (Map<String, dynamic> device_map in category_entry.value) {
          Device device = Device(
              device_map["device_id"],
              device_map["device_descriptor"],
              device_map["led"],
              device_map["power"],
              device_map["power_draw"]);

          category.devices.add(device);
        }

        categories.add(category);
      }

      return categories;
    } else {
      throw Exception("Failed to fetch devices");
    }
  }
}

class CategoryWidget extends StatelessWidget {
  Category category;

  CategoryWidget({super.key, required this.category});

  @override
  Widget build(BuildContext context) {
    var list = category.devices
        .map((device) => TableRow(children: [
              Text(device.device_descriptor ?? device.device_id),
              Text(device.led_state.toString()),
              Text(device.power_state.toString()),
              Text("${device.power_draw.toString()} W")
            ]))
        .toList();

    list.insert(
        0,
        const TableRow(children: [
          Text("Name"),
          Text("LED"),
          Text("Power"),
          Text("Power Draw"),
        ]));

    return Column(
        children: <Widget>[Text(category.name), Table(children: list)]);
  }
}

class Device {
  final String device_id;
  String? device_descriptor;
  bool led_state;
  bool power_state;
  double power_draw;

  Device(this.device_id, this.device_descriptor, this.led_state,
      this.power_state, this.power_draw);
}