add a config popup window for updating connection settings from within the TUI.

src/q3rcon_tui/rcon_tui.tcss

@@ -7,14 +7,14 @@
     border-title-color: #88c0d0;
     border-title-style: bold;
     padding: 1 3;
-    grid-size: 2 3;
+    grid-size: 3 3;
     grid-gutter: 1 2;
     grid-rows: auto 1fr auto;
     align: center middle;
 }
 
 #command {
-    column-span: 2;
+    column-span: 3;
     height: auto;
     width: 1fr;
     content-align: center middle;
@@ -31,7 +31,7 @@
 }
 
 #response {
-    column-span: 2;
+    column-span: 3;
     height: 1fr;
     background: #2e3440;
     border: solid #4c566a;
@@ -57,6 +57,24 @@ Button:hover {
     text-style: bold;
 }
 
+Button.success {
+    background: #a3be8c;
+}
+
+Button.success:hover {
+    background: #8fbcbb;
+}
+
+Button.warning {
+    background: #ebcb8b;
+    color: #2e3440;
+}
+
+Button.warning:hover {
+    background: #d08770;
+    color: #2e3440;
+}
+
 Button.error {
     background: #bf616a;
 }
@@ -79,6 +97,75 @@ Button.error:hover {
     background: #a3be8c;
 }
 
+#config {
+    background: #ebcb8b;
+    color: #2e3440;
+}
+
+#config:hover {
+    background: #d08770;
+    color: #2e3440;
+}
+
 #send:hover {
     background: #8fbcbb;
+}
+
+/* Configuration Dialog Styles */
+#config-dialog {
+    background: #2e3440;
+    border: heavy #4c566a;
+    border-title-color: #ebcb8b;
+    border-title-style: bold;
+    padding: 1 2;
+    width: 60;
+    height: 30;
+    align: center middle;
+}
+
+#config-title {
+    content-align: center middle;
+    text-style: bold;
+    color: #88c0d0;
+    height: 3;
+    width: 100%;
+    background: #3b4252;
+    margin-bottom: 1;
+}
+
+#config-form {
+    height: auto;
+    width: 100%;
+    margin-bottom: 1;
+}
+
+#config-form Label {
+    margin-bottom: 1;
+    color: #d8dee9;
+    text-style: bold;
+}
+
+#config-form Input {
+    height: 3;
+    width: 100%;
+    margin-bottom: 1;
+    background: #3b4252;
+    border: solid #4c566a;
+    padding: 0 1;
+}
+
+#config-form Input:focus {
+    border: solid #88c0d0;
+    background: #434c5e;
+}
+
+#config-buttons {
+    height: 3;
+    width: 100%;
+    align: center middle;
+}
+
+#config-buttons Button {
+    width: 1fr;
+    margin: 0 1;
 }

src/q3rcon_tui/tui.py

@@ -7,8 +7,9 @@ from loguru import logger
 from pydantic import AfterValidator, BeforeValidator
 from pydantic_settings import BaseSettings, CliSettingsSource, SettingsConfigDict
 from textual.app import App, ComposeResult
-from textual.containers import Grid
+from textual.containers import Grid, Horizontal, Vertical
-from textual.widgets import Button, Input, RichLog
+from textual.screen import ModalScreen
+from textual.widgets import Button, Input, Label, RichLog, Static
 
 from .__about__ import __version__ as version
 
@@ -43,6 +44,9 @@ class Settings(BaseSettings):
         cli_prefix='',
         cli_parse_args=True,
         cli_implicit_flags=True,
+        # Allow field assignment for runtime updates
+        validate_assignment=False,
+        frozen=False,
     )
 
     @classmethod
@@ -69,6 +73,64 @@ except ValueError as e:
     raise SystemExit(1)
 
 
+class ConfigScreen(ModalScreen[bool]):
+    """Modal dialog for configuring connection settings."""
+
+    def __init__(self, current_host: str, current_port: int, current_password: str):
+        super().__init__()
+        self.current_host = current_host
+        self.current_port = current_port
+        self.current_password = current_password
+
+    def compose(self) -> ComposeResult:
+        with Vertical(id='config-dialog'):
+            yield Static('Connection Configuration', id='config-title')
+            with Vertical(id='config-form'):
+                yield Label('Host:')
+                yield Input(
+                    value=self.current_host, placeholder='localhost', id='host-input'
+                )
+                yield Label('Port:')
+                yield Input(
+                    value=str(self.current_port), placeholder='28960', id='port-input'
+                )
+                yield Label('Password:')
+                yield Input(
+                    value=self.current_password,
+                    placeholder='Enter password',
+                    password=True,
+                    id='password-input',
+                )
+            with Horizontal(id='config-buttons'):
+                yield Button('Save', variant='success', id='config-save')
+                yield Button('Cancel', variant='error', id='config-cancel')
+
+    def on_button_pressed(self, event: Button.Pressed) -> None:
+        if event.button.id == 'config-save':
+            try:
+                new_host = (
+                    self.query_one('#host-input', Input).value.strip() or 'localhost'
+                )
+                new_port = int(self.query_one('#port-input', Input).value or '28960')
+                new_password = self.query_one('#password-input', Input).value
+
+                if new_port < 1 or new_port > 65535:
+                    raise ValueError('Port must be between 1 and 65535')
+
+                if len(new_password) < 8:
+                    raise ValueError('Password must be at least 8 characters long')
+
+                settings.host = new_host
+                settings.port = new_port
+                settings.password = new_password
+
+                self.dismiss(True)
+            except ValueError:
+                self.app.bell()
+        elif event.button.id == 'config-cancel':
+            self.dismiss(False)
+
+
 class RconApp(App):
     RE_COLOR_CODES = re.compile(r'\^[0-9]')
     CSS_PATH = 'rcon_tui.tcss'
@@ -77,19 +139,34 @@ class RconApp(App):
         yield Grid(
             Input('status', placeholder='Enter a rcon command', id='command'),
             RichLog(id='response'),
-            Button('Send', variant='error', id='send'),
+            Button('Send', variant='success', id='send'),
+            Button('Config', variant='warning', id='config'),
             Button('Quit', variant='primary', id='quit'),
             id='dialog',
         )
 
     async def on_key(self, event) -> None:
-        if event.key == 'enter':
+        match event.key:
-            if self.query_one('#command', Input).has_focus:
+            case 'enter' if self.query_one('#command', Input).has_focus:
                 self.query_one('#send', Button).press()
+            case 'f2':
+                self.query_one('#config', Button).press()
 
     async def on_button_pressed(self, event: Button.Pressed) -> None:
         if event.button.id == 'quit':
             self.app.exit()
+        elif event.button.id == 'config':
+            result = await self.push_screen(
+                ConfigScreen(settings.host, settings.port, settings.password)
+            )
+            if result:
+                self.query_one('#response', RichLog).write(
+                    f'Configuration updated: {settings.host}:{settings.port}'
+                )
+            return
+
+        if event.button.id != 'send':
+            return
 
         if settings.refresh_output:
             self.query_one('#response', RichLog).clear()