From f07e4b5521403965237f191e5d07809d85c3aeb3 Mon Sep 17 00:00:00 2001
From: Tyler Matteson <tyler@agritheory.com>
Date: Mon, 11 Aug 2025 18:28:25 -0400
Subject: [PATCH] wip: usb scale

---
 .pre-commit-config.yaml       | 32 ++++++++------------
 beam/docs/scale.md            |  7 +++++
 beam/public/js/beam.bundle.js |  1 +
 beam/public/js/scale/scale.js | 57 +++++++++++++++++++++++++++++++++++
 4 files changed, 78 insertions(+), 19 deletions(-)
 create mode 100644 beam/docs/scale.md
 create mode 100644 beam/public/js/scale/scale.js

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index aa7cc233..773a9ff6 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -4,7 +4,7 @@ fail_fast: false
 
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v5.0.0
+    rev: v4.3.0
     hooks:
       - id: trailing-whitespace
         files: 'beam.*'
@@ -20,42 +20,43 @@ repos:
       - id: debug-statements
 
   - repo: https://github.com/asottile/pyupgrade
-    rev: v3.19.1
+    rev: v2.34.0
     hooks:
       - id: pyupgrade
-        args: ['--py310-plus']
+        args: ['--py38-plus']
 
-  - repo: https://github.com/agritheory/black
+  - repo: https://github.com/frappe/black
     rev: 951ccf4d5bb0d692b457a5ebc4215d755618eb68
     hooks:
       - id: black
 
-  - repo: https://github.com/PyCQA/autoflake
-    rev: v2.3.1
+  - repo: local
     hooks:
-      - id: autoflake
-        args: [--remove-all-unused-imports, --in-place]
+      - id: prettier
+        name: prettier
+        entry: npx prettier . --write --ignore-path .prettierignore
+        language: node
 
   - repo: https://github.com/PyCQA/isort
-    rev: 6.0.0
+    rev: 5.12.0
     hooks:
       - id: isort
 
   - repo: https://github.com/PyCQA/flake8
-    rev: 7.1.1
+    rev: 5.0.4
     hooks:
       - id: flake8
         additional_dependencies: ['flake8-bugbear']
 
   - repo: https://github.com/codespell-project/codespell
-    rev: v2.4.1
+    rev: v2.3.0
     hooks:
       - id: codespell
         additional_dependencies:
           - tomli
 
   - repo: https://github.com/agritheory/test_utils
-    rev: v0.17.0
+    rev: v1.0.0
     hooks:
       - id: update_pre_commit_config
       - id: validate_copyright
@@ -65,13 +66,6 @@ repos:
         args: ['--app', 'beam']
       - id: validate_customizations
 
-  - repo: local
-    hooks:
-      - id: prettier
-        name: prettier
-        entry: npx prettier . --write --ignore-path .prettierignore
-        language: node
-
 ci:
   autoupdate_schedule: weekly
   skip: []
diff --git a/beam/docs/scale.md b/beam/docs/scale.md
new file mode 100644
index 00000000..18c8ed6b
--- /dev/null
+++ b/beam/docs/scale.md
@@ -0,0 +1,7 @@
+<!-- Copyright (c) 2025, AgriTheory and contributors
+For license information, please see license.txt-->
+
+# Using the scale features
+
+The WebHID protocol is not supported in all browsers, [look here for compatibility](https://developer.mozilla.org/en-US/docs/Web/API/WebHID_API#browser_compatibility)
+
diff --git a/beam/public/js/beam.bundle.js b/beam/public/js/beam.bundle.js
index 70eaa466..4a3b6e4d 100644
--- a/beam/public/js/beam.bundle.js
+++ b/beam/public/js/beam.bundle.js
@@ -4,3 +4,4 @@
 import './scan/scan.js'
 import './print/print.js'
 // import './example_custom_callback.js'
+import './scale/scale.js'
diff --git a/beam/public/js/scale/scale.js b/beam/public/js/scale/scale.js
new file mode 100644
index 00000000..b4203631
--- /dev/null
+++ b/beam/public/js/scale/scale.js
@@ -0,0 +1,57 @@
+// Copyright (c) 2025, AgriTheory and contributors
+// For license information, please see license.txt
+
+frappe.ui.form.on('Purchase Receipt', {
+	async refresh(frm) {
+		await setup_scale(frm)
+	},
+})
+
+async function setup_scale(frm) {
+	$('.form-sidebar').append(`<div style="font-size: 300%; text-align: right">
+	<p id="scale-readout"> 0.0 oz</p>
+	<button id="use-scale" class="btn btn-lg btn-success">USE SCALE</button>
+	</div>`)
+	let scale_readout = $('#scale-readout')
+	$('#use-scale').on('click', () => use_scale(scale_readout))
+	let array_of_weight_readings = []
+	let weighed = false
+	let _mode = undefined
+	async function use_scale(scale_readout) {
+		$('#use-scale').hide()
+		const device = (await navigator.hid.requestDevice({ filters: [] }))?.[0]
+		await device.open()
+
+		// think of this as a while loop
+		device.oninputreport = report => {
+			// check for "exit" or "weighed" flag
+			const { value, unit } = parseScaleData(report.data)
+			// detect if last __ on array are <= 0 as signal to move to next item
+			//
+			array_of_weight_readings.push(value)
+			_mode = scale_readout.html(`${value} ${unit}`)
+		}
+	}
+}
+
+function parseScaleData(data) {
+	const sign = Number(data.getUint8(0)) == 4 ? 1 : -1 // 4 = positive, 5 = negative, 2 = zero
+	const unit = Number(data.getUint8(1)) == 2 ? 'g' : 'oz' // 2 = g, 11 = oz
+	const value = Number(data.getUint16(3, true)) // this one needs little endian
+	return { value: sign * (unit == 'oz' ? value / 10 : value), unit }
+}
+
+function mode(arr) {
+	if (arr.filter((x, index) => arr.indexOf(x) == index).length == arr.length) return arr
+	else
+		return mode(
+			arr
+				.sort((x, index) => x - index)
+				.map((x, index) => (arr.indexOf(x) != index ? x : null))
+				.filter(x => x != null)
+		)
+}
+
+function set_qty_uom_and_focus_on_next_qty_field(frm, qty, uom) {
+	console.log(qty, uom)
+}