Added user state (nested menus) and sub-menu to control different potential problems and system status

OpenHab/OpenHabClient.cs

@@ -0,0 +1,83 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+namespace ZaoBot.OpenHab
+{
+	class OpenHabClient
+	{
+		private string url;
+		HttpClient http = new HttpClient();
+
+		public OpenHabClient(string url)
+		{
+			this.url = url;
+		}
+
+		public async Task<ItemState> GetItemState(string item)
+		{
+			var result = await http.GetAsync(url + "/rest/items/" + item);
+			var content = await result.Content.ReadAsStringAsync();
+			return ParseState(content);
+		}
+
+		private ItemState ParseState(string content)
+		{
+			var doc = JsonDocument.Parse(content);
+
+			var pattern = "";
+			JsonElement stateDescription;
+			if (doc.RootElement.TryGetProperty("stateDescription", out stateDescription))
+			{
+				pattern = stateDescription.GetProperty("pattern").GetString();
+			}
+			var result = new ItemState()
+			{
+				state = doc.RootElement.GetProperty("state").GetString(),
+				pattern = pattern,
+			};
+			return result;
+		}
+
+		public async Task<string> PostItemState(string item, string state)
+		{
+			return await Post(url + "/rest/items/" + item, state);
+		}
+
+		private async Task<string> Post(string url, string v)
+		{
+			var content = new ByteArrayContent(Encoding.UTF8.GetBytes(v));
+			content.Headers.Add("Content-Type", "text/plain");
+			var result = await http.PostAsync(url, content);
+			if (result.IsSuccessStatusCode) return "OK";
+			else return "Fail. " + result.ReasonPhrase;
+		}
+
+		public async Task<List<Item>> GetItems()
+		{
+			var result = await http.GetAsync(url + "/rest/items/?fields=name,type,label");
+			var content = await result.Content.ReadAsStringAsync();
+			var doc = JsonDocument.Parse(content);
+			var items = new List<Item>();
+			foreach (var element in doc.RootElement.EnumerateArray())
+			{
+				var label = "";
+				JsonElement l;
+				if (element.TryGetProperty("label", out l))
+				{
+					label = l.GetString();
+				}
+				items.Add(new Item()
+				{
+					name = element.GetProperty("name").GetString(),
+					type = element.GetProperty("type").GetString(),
+					label = label,
+				});
+			}
+			return items;
+		}
+	}
+}