Initial commit

Groceries/Home/HomeController.cs

@@ -0,0 +1,47 @@
+namespace Groceries.Home;
+
+using Groceries.Data;
+
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+[Route("/")]
+public class HomeController : Controller
+{
+    private readonly AppDbContext dbContext;
+
+    public HomeController(AppDbContext dbContext)
+    {
+        this.dbContext = dbContext;
+    }
+
+    [HttpGet]
+    public async Task<IActionResult> IndexAsync()
+    {
+        var randomTagQuantity = await dbContext.ItemTagQuantities
+            .FromSql($"""
+                SELECT tag, quantity, coalesce(unit_name, unit) AS unit, is_metric, is_divisible
+                FROM (
+                    SELECT
+                        unnest(tags) AS tag,
+                        round(sum((item_quantity->'amount')::numeric * quantity), 1) AS quantity,
+                        item_quantity->>'unit' AS unit,
+                        item_quantity->'is_metric' AS is_metric,
+                        item_quantity->'is_divisible' AS is_divisible
+                    FROM item_purchases
+                    JOIN items USING (item_id)
+                    CROSS JOIN item_quantity(name)
+                    WHERE array_length(tags, 1) > 0
+                        AND age(created_at) <= '90 days'
+                        AND item_quantity IS NOT NULL
+                    GROUP BY tag, item_quantity->>'unit', item_quantity->'is_metric', item_quantity->'is_divisible'
+                    ORDER BY random()
+                    FETCH FIRST ROW ONLY
+                ) AS random_item_tag_quantity
+                LEFT JOIN item_tags USING (tag)
+                """)
+            .FirstOrDefaultAsync();
+
+        return View(randomTagQuantity);
+    }
+}

Groceries/Home/Index.cshtml

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+@using Groceries.Data
+@using Humanizer
+
+@model ItemTagQuantity?
+
+@section head {
+    @*<meta name="turbo-cache-control" content="no-preview" />*@
+}
+
+<section class="card">
+    <header class="card__header">
+        <h2>Item Quantity (last 90 days)</h2>
+    </header>
+    <div class="card__content">
+        @if (Model != null)
+        {
+            @if (Model.IsDivisible)
+            {
+                var quantity = Convert.ToDouble(Model.Quantity);
+                var weekQuantity = Math.Round(quantity / 12);
+
+                <strong>@(Model.IsMetric ? quantity.ToMetric() : quantity)@Model.Unit @Model.Tag</strong>
+                <small>(@(Model.IsMetric ? weekQuantity.ToMetric() : weekQuantity)@Model.Unit per week)</small>
+            }
+            else
+            {
+                var name = Model.Unit != null ? $"{Model.Tag} {Model.Unit}" : Model.Tag;
+
+                var avgQuantity = Model.Quantity / 12;
+                var avgPeriod = "week";
+                if (avgQuantity < 1)
+                {
+                    avgQuantity *= 4;
+                    avgPeriod = "month";
+                }
+
+                <strong>@name.ToQuantity(Convert.ToInt32(Model.Quantity))</strong>
+                <small>(@name.ToQuantity(Convert.ToInt32(avgQuantity)) per @avgPeriod)</small>
+            }
+        }
+    </div>
+</section>