From 03f016aa8513bdd56ae6efaf9958fe6b6f314c1e Mon Sep 17 00:00:00 2001
From: Sam Spencer <samsp@microsoft.com>
Date: Fri, 15 Sep 2023 14:08:42 -0700
Subject: [PATCH] Basic charting for metrics using plotly.js rather than Mud
 Blazor.

This removes the last dependency we have on mud blazor, so we have good alternatives.
---
 .../Components/DimensionedCounterView.razor   |  3 +-
 .../DimensionedCounterView.razor.cs           | 45 +++++++++++++++++--
 OTLPView/Extensions/Helpers.cs                |  6 +++
 OTLPView/Pages/_Host.cshtml                   |  1 +
 4 files changed, 51 insertions(+), 4 deletions(-)

diff --git a/OTLPView/Components/DimensionedCounterView.razor b/OTLPView/Components/DimensionedCounterView.razor
index 9fc62f6..b174e79 100644
--- a/OTLPView/Components/DimensionedCounterView.razor
+++ b/OTLPView/Components/DimensionedCounterView.razor
@@ -25,7 +25,8 @@
         <MudCardContent>
             <MudStack Row="true">
                 <MudPaper>
-                    <MudChart ChartType="ChartType.Line" ChartSeries="@chartValues" XAxisLabels="@chartLabels" Width="500x" Height="400px"></MudChart>
+                    @* <MudChart ChartType="ChartType.Line" ChartSeries="@chartValues" XAxisLabels="@chartLabels" Width="500x" Height="400px"></MudChart> *@
+                    @( _graph)
                 </MudPaper>
                 <MudPaper>
                     <div>Recent Values:</div>
diff --git a/OTLPView/Components/DimensionedCounterView.razor.cs b/OTLPView/Components/DimensionedCounterView.razor.cs
index f4f7e6f..9709b3d 100644
--- a/OTLPView/Components/DimensionedCounterView.razor.cs
+++ b/OTLPView/Components/DimensionedCounterView.razor.cs
@@ -1,15 +1,26 @@
+using Microsoft.JSInterop;
+using static System.Runtime.InteropServices.JavaScript.JSType;
+
 namespace OTLPView.Components;
 
 public sealed partial class DimensionedCounterView
 {
+    static int lastId = 0;
+
     // Define the size of the graph based on the number of points and the duration of each point
     private const int GRAPH_POINT_COUNT = 18; // 3 minutes
     private const int GRAPH_POINT_SIZE = 10; // 10s
 
+    [Inject]
+    private IJSRuntime JSRuntime { get; set; }
 
     private DimensionScope _dimension;
     private string[] chartLabels;
     private List<ChartSeries> chartValues;
+    private readonly int _instanceID = ++lastId;
+
+    private double[] _chartLabels;
+    private double[] _chartValues;
 
     [Parameter, EditorRequired]
     public required DimensionScope Dimension
@@ -26,6 +37,7 @@ public required DimensionScope Dimension
                     Data = CalcChartValues(_dimension, GRAPH_POINT_COUNT, GRAPH_POINT_SIZE)
                 }
             };
+            _chartValues = CalcChartValues(_dimension, GRAPH_POINT_COUNT, GRAPH_POINT_SIZE);
         }
     }
 
@@ -35,6 +47,7 @@ public required DimensionScope Dimension
     protected override void OnInitialized()
     {
         chartLabels = CalcLabels(GRAPH_POINT_COUNT, GRAPH_POINT_SIZE);
+        _chartLabels = _CalcLabels(GRAPH_POINT_COUNT, GRAPH_POINT_SIZE);
     }
 
     private string[] CalcLabels(int pointCount, int pointSize)
@@ -48,6 +61,17 @@ private string[] CalcLabels(int pointCount, int pointSize)
         return labels;
     }
 
+    private double[] _CalcLabels(int pointCount, int pointSize)
+    {
+        var duration = pointSize * pointCount;
+        var labels = new double[pointCount];
+        for (var i = 0; i < pointCount; i++)
+        {
+            labels[i] = (pointSize * (i + 1)) - duration;
+        }
+        return labels;
+    }
+
     // Graph is not based on x,y coordinates, but rather a series of data points with a value
     // Each point in the graph is the max value of all the values in that point's time range
     private double[] CalcChartValues(DimensionScope dimension, int pointCount, int pointSize)
@@ -57,11 +81,11 @@ private double[] CalcChartValues(DimensionScope dimension, int pointCount, int p
         var now = DateTime.UtcNow;
         foreach (var point in dimension.Values)
         {
-            var start = CalcOffset(now-point.Start, pointCount, pointSize);
-            var end = CalcOffset(now-point.End, pointCount, pointSize);
+            var start = CalcOffset(now - point.Start, pointCount, pointSize);
+            var end = CalcOffset(now - point.End, pointCount, pointSize);
             if (start is not null && end is not null)
             {
-                for (var i = start.GetValueOrDefault(0); i <= end.GetValueOrDefault(pointCount-1); i++)
+                for (var i = start.GetValueOrDefault(0); i <= end.GetValueOrDefault(pointCount - 1); i++)
                 {
                     values[i] = point switch
                     {
@@ -95,6 +119,21 @@ private double[] CalcFakeValues(int pointCount)
         return values;
     }
 
+    protected override async Task OnAfterRenderAsync(bool firstRender)
+    {
+        var data = new[]{ new {
+              x= _chartLabels,
+              y= _chartValues,
+              type= "scatter"
+            } };
 
+        await JSRuntime.InvokeVoidAsync("Plotly.newPlot", $"lineChart{_instanceID}", data);
+    }
 
+    RenderFragment _graph => (builder) =>
+        {
+            builder.AddMarkupContent(0, $$"""
+      <div id="lineChart{{_instanceID}}" style="width:500px; height:400px"></div>
+""");
+        };
 }
diff --git a/OTLPView/Extensions/Helpers.cs b/OTLPView/Extensions/Helpers.cs
index 6beadb1..bb0d8b6 100644
--- a/OTLPView/Extensions/Helpers.cs
+++ b/OTLPView/Extensions/Helpers.cs
@@ -109,6 +109,12 @@ public static DateTime UnixNanoSecondsToDateTime(ulong unixTimeNanoSeconds)
         return DateTimeOffset.FromUnixTimeMilliseconds(milliseconds).DateTime;
     }
 
+    public static string ToJSArray(this double[] values) =>
+        $"[{string.Join(",", values)}]";
+
+    public static string ToJSArray(this string[] values) =>
+    $"['{string.Join("','", values)}']";
+
     public static string ToHexString(this Google.Protobuf.ByteString bytes)
     {
         if (bytes is null or { Length: 0 })
diff --git a/OTLPView/Pages/_Host.cshtml b/OTLPView/Pages/_Host.cshtml
index 8116a6e..64cbff6 100644
--- a/OTLPView/Pages/_Host.cshtml
+++ b/OTLPView/Pages/_Host.cshtml
@@ -36,5 +36,6 @@
 
     <script src="_framework/blazor.server.js"></script>
     <script src="_content/MudBlazor/MudBlazor.min.js"></script>
+    <script src='https://cdn.plot.ly/plotly-2.25.2.min.js'></script>
 </body>
 </html>