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

    List<Category> categories = [];

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

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

      for (List<dynamic> device_info in category_entry.value) {
        String device_id = device_info[0];
        String? device_descriptor = device_info[1];
        bool power_control = device_info[2];

        final response =
            await http.get(Uri.parse("$base_url/plug_state/$device_id"));

        if (response.statusCode != 200) {
          throw Exception("Failed to fetch plug_state for $device_id");
        }

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

        Device device = Device(
          device_id,
          device_descriptor,
          device_state["led"],
          device_state["power"],
          device_state["power_draw"],
          power_control && device_state["power_draw"] < 15,
        );

        category.devices.add(device);
      }

      categories.add(category);
    }

    return categories;
  }
}

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;
  bool power_control;

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