From e7824dc29739b38137dae323798dca998a16aabd Mon Sep 17 00:00:00 2001
From: Jens Ahrensfeld <jens@jayfield.org>
Date: Tue, 30 Jun 2026 19:53:54 +0200
Subject: [PATCH] ui: show water level and status line before any sud is loaded
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Pot config (water_mass, volumen) sent in System message at startup.
app.js stores potConfig and uses it in updatePotVisualization/
updateStatusLine when sudEmpty, showing startup fill level and
"No schedule – N L water" without requiring a sud to be loaded first.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 config-real.json.tpl |  4 +++-
 config-sim.json.tpl  |  4 +++-
 server/brewpi.py     |  3 ++-
 web/app.js           | 26 +++++++++++++++++++++-----
 4 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/config-real.json.tpl b/config-real.json.tpl
index d1a161d..07c48ec 100644
--- a/config-real.json.tpl
+++ b/config-real.json.tpl
@@ -48,6 +48,8 @@
 		"mass": 5.96,
 		"material": "Edelstahl 18/10",
 		"L": 0.2,
-		"Td": 17
+		"Td": 17,
+		"water_mass": 22,
+		"volumen": 30
 	}
 }
diff --git a/config-sim.json.tpl b/config-sim.json.tpl
index 8bd8421..f86299a 100644
--- a/config-sim.json.tpl
+++ b/config-sim.json.tpl
@@ -47,6 +47,8 @@
 		"mass": 5.96,
 		"material": "Edelstahl 18/10",
 		"L": 0.2,
-		"Td": 17
+		"Td": 17,
+		"water_mass": 22,
+		"volumen": 30
 	}
 }
diff --git a/server/brewpi.py b/server/brewpi.py
index 40e9362..32f36e4 100755
--- a/server/brewpi.py
+++ b/server/brewpi.py
@@ -164,7 +164,8 @@ if __name__ == '__main__':
 	msg_system = dispatcher.msgio_get("System")
 
 	async def send_system_info():
-		await msg_system.send({'AmbientTemp': theta_amb, 'WarpFactor': DT / DT_TASK, 'PlantSim': plant_sim})
+		await msg_system.send({'AmbientTemp': theta_amb, 'WarpFactor': DT / DT_TASK, 'PlantSim': plant_sim,
+			'Pot': config.get('Pot', {})})
 	asyncio.ensure_future(send_system_info())
 
 	async def on_system_recv(data):
diff --git a/web/app.js b/web/app.js
index 96da869..61ebfd8 100644
--- a/web/app.js
+++ b/web/app.js
@@ -41,6 +41,10 @@ let heaterMaxPower = 100;
 // Only switchable when not running; auto-reset to true on play.
 let closedLoop = true;
 
+// Pot hardware config from server's Pot section - used for display before
+// any sud is loaded (startup water level, status line).
+let potConfig = {};
+
 // Sud state - mirrors the sud_* fields on client/brewpi_gui.py's Window.
 let sudSchedule = [];
 let sudName = '';
@@ -420,7 +424,11 @@ function updatePotVisualization() {
 	const levelTickEl   = document.getElementById('level-tick');
 	const levelLabelEl  = document.getElementById('level-label');
 
-	if (sudEmpty || sudVolumen <= 0) {
+	const volumen   = sudEmpty ? (potConfig.volumen    || 0) : sudVolumen;
+	const grainMass = sudEmpty ? 0                          : currentStepGrainMass();
+	const waterMass = sudEmpty ? (potConfig.water_mass || 0) : currentStepWaterMass();
+
+	if (volumen <= 0) {
 		waterFillEl.setAttribute('height', '0');
 		waterWaveEl.setAttribute('d', '');
 		if (waterClipRect) waterClipRect.setAttribute('height', '0');
@@ -430,9 +438,8 @@ function updatePotVisualization() {
 		return;
 	}
 
-	const grainMass      = currentStepGrainMass();
-	const utilizedVolume = currentStepWaterMass() + grainMass * 0.7;
-	const fillFraction   = Math.min(1, Math.max(0, utilizedVolume / sudVolumen));
+	const utilizedVolume = waterMass + grainMass * 0.7;
+	const fillFraction   = Math.min(1, Math.max(0, utilizedVolume / volumen));
 	const waterH         = fillFraction * potInnerH;
 	const waterTop       = potInnerBottom - waterH;
 	waterFillEl.setAttribute('y', waterTop.toFixed(1));
@@ -462,7 +469,8 @@ function updatePotVisualization() {
 function updateStatusLine() {
 	const el = document.getElementById('sud-status-line');
 	if (sudSchedule.length === 0) {
-		el.textContent = '';
+		const w = potConfig.water_mass || 0;
+		el.textContent = w > 0 ? `No schedule – ${w} L water` : '';
 		return;
 	}
 	let text = '';
@@ -776,6 +784,13 @@ function onSystemChanged(msg) {
 	if ('PlantSim' in msg) {
 		document.getElementById('pot-reset-row').classList.toggle('hidden', !msg.PlantSim);
 	}
+	if ('Pot' in msg) {
+		potConfig = msg.Pot;
+		if (sudEmpty) {
+			updatePotVisualization();
+			updateStatusLine();
+		}
+	}
 }
 
 const HANDLERS = {
@@ -820,6 +835,7 @@ function connect() {
 		initialTempSollSync = true;
 		initialPotTempSync = true;
 		closedLoop = true;
+		potConfig = {};
 		setConnected(true);
 		for (const channel of CHANNELS) {
 			ws.send(JSON.stringify({'+': channel}));