From 3ad649a402ba999adb20f6b34058c3b7aee85a3d Mon Sep 17 00:00:00 2001
From: Paul Brinkmeier <hallo@pbrinkmeier.de>
Date: Fri, 11 Aug 2023 14:34:57 +0200
Subject: [PATCH] Add /inventory/report route

---
 py/jon/db/get_inventory_report.sql          | 37 +++++++++++++++++++++
 py/jon/inventory.py                         | 14 +++++++-
 py/jon/templates/inventory/read_report.html | 28 ++++++++++++++++
 3 files changed, 78 insertions(+), 1 deletion(-)
 create mode 100644 py/jon/db/get_inventory_report.sql
 create mode 100644 py/jon/templates/inventory/read_report.html

diff --git a/py/jon/db/get_inventory_report.sql b/py/jon/db/get_inventory_report.sql
new file mode 100644
index 0000000..1a21f6d
--- /dev/null
+++ b/py/jon/db/get_inventory_report.sql
@@ -0,0 +1,37 @@
+WITH
+most_recent_sales AS (
+    SELECT DISTINCT ON (inventory_line)
+        inventory_line, snack_sales_log_id, snack_sales_log_timestamp AS most_recent_sale
+    FROM garfield.snack_sales_log
+    ORDER BY inventory_line ASC, snack_sales_log_timestamp DESC
+),
+enhanced_overview AS (
+    SELECT
+        inventory_items.item_id,
+        inventory_items.item_barcode,
+        inventory_items.name,
+        units_left,
+        location_name,
+        location,
+        CASE
+            WHEN snack_sales_log_id IS NULL THEN 0
+            ELSE sales / (EXTRACT(EPOCH FROM most_recent_sale) - EXTRACT(EPOCH FROM bought)) * 24 * 3600
+        END AS per_day
+    FROM garfield.inventory_item_overview
+    LEFT JOIN garfield.inventory_items USING (item_id)
+    LEFT JOIN most_recent_sales ON item_id = inventory_line
+)
+    
+SELECT
+    *,
+    CASE
+        WHEN per_day = 0 THEN NULL
+        ELSE GREATEST(0, units_left / per_day)
+    END AS days_left,
+    CASE
+        WHEN per_day = 0 THEN NULL
+        ELSE GREATEST(0, (60 - GREATEST(0, units_left / per_day)) * per_day)
+    END AS for_two_months
+FROM enhanced_overview
+WHERE (%(location_id)s IS NULL OR location = %(location_id)s)
+ORDER BY days_left ASC, per_day DESC
diff --git a/py/jon/inventory.py b/py/jon/inventory.py
index a451049..43aafad 100644
--- a/py/jon/inventory.py
+++ b/py/jon/inventory.py
@@ -6,7 +6,7 @@ from . import db
 bp = Blueprint("inventory", __name__, url_prefix="/inventory")
 
 
-@bp.route("/")
+@bp.get("/")
 def index():
     location = session.get("location", None)
     items = db.run_query("get_inventory_overview.sql", {
@@ -18,6 +18,18 @@ def index():
     })
 
 
+@bp.get("/report")
+def read_report():
+    location = session.get("location", None)
+    items = db.run_query("get_inventory_report.sql", {
+        "location_id": None if location is None else location["location_id"]
+    }).fetchall()
+
+    return render_template("inventory/read_report.html", **{
+        "items": items
+    })
+
+
 @bp.get("/item/<item_id>")
 def read_item(item_id: int):
     item = db.run_query("get_item_by_id.sql", {
diff --git a/py/jon/templates/inventory/read_report.html b/py/jon/templates/inventory/read_report.html
new file mode 100644
index 0000000..c907991
--- /dev/null
+++ b/py/jon/templates/inventory/read_report.html
@@ -0,0 +1,28 @@
+{% extends "base.html" %}
+
+{% block content %}
+<table>
+  <tr>
+    <th>ID</th>
+    <th>Barcode</th>
+    <th>Name</th>
+    <th>Inventar</th>
+    <th>Raum</th>
+    <th>Verbrauch [1/d]</th>
+    <th>ETUE [d]</th>
+    <th>Für 2m</th>
+  </tr>
+{% for item in items %}
+  <tr>
+    <td><a href="/inventory/item/{{ item.item_id }}">{{ item.item_id }}</a></td>
+    <td><code>{{ item.item_barcode }}</code></td>
+    <td>{{ item.name }}</td>
+    <td class="--align-right">{{ item.units_left }}</td>
+    <td>{{ item.location_name }}</td>
+    <td class="--align-right">{{ item.per_day|round(2) }}</td>
+    <td class="--align-right">{% if item.days_left != None %}{{ item.days_left|round(1) }}{% endif %}</td>
+    <td class="--align-right">{% if item.for_two_months %}{{ item.for_two_months|round(1) }}{% endif %}</td>
+  </tr>
+{% endfor %}
+</table>
+{% endblock %}