feat: reconnect on disconnect (add status to TUI)

- add `Connected()` method for client
- add `LastErr` field to GoTomatoClient
  - replace error logging by updating `LastErr` field
  - modify methods to use pointer receivers for Client
- add `prevMessage` variable to store the last received server message
- show connect status in TUI
- use EnterAltScreen instead of ClearScreen

internal/websocket/receive.go

@@ -2,9 +2,10 @@ package websocket
 
 import (
 	"encoding/json"
+	"time"
+
 	"github.com/gorilla/websocket"
 
-	"git.smsvc.net/pomodoro/ChronoTomato/internal/helper"
 	GoTomato "git.smsvc.net/pomodoro/GoTomato/pkg/models"
 )
 
@@ -12,30 +13,35 @@ var Done = make(chan struct{})
 
 // Receives websocket messages and writes them to a channel.
 // Closes the channel if websocket closes.
-func (c Client) ProcessServerMessages(channel chan<- GoTomato.ServerMessage) {
-	var serverMessage GoTomato.ServerMessage
+func (c *Client) ProcessServerMessages(channel chan<- GoTomato.ServerMessage) {
+	var serverMessage, prevMessage GoTomato.ServerMessage
 
 	defer close(Done)
 
 	for {
 		_, message, err := c.Conn.ReadMessage()
 		if err != nil {
+			// On normal closure exit gracefully
 			if websocket.IsCloseError(err, websocket.CloseNormalClosure) {
-				// Ignore normal closure and exit gracefully
 				return
 			}
-			// Log any other errors
-			helper.Logger.Error("Read error!", "reason", err)
-			close(channel)
-			return
-		}
 
-		err = json.Unmarshal(message, &serverMessage)
-		if err != nil {
-			helper.Logger.Error("Error unmarshalling!", "reason", err)
+			// Try to reconnect on unexpected disconnect
+			for {
+				channel <- prevMessage // send previous ServerMessage to update view
+				time.Sleep(time.Second)
+				*c = Connect(c.Server)
+				if c.Connected() {
+					break
+				}
+			}
 			continue
 		}
 
+		err = json.Unmarshal(message, &serverMessage)
+		c.LastErr = err
+
 		channel <- serverMessage
+		prevMessage = serverMessage
 	}
 }