From 4a77e55a8ff0adba7cc7cf3d8d5263448ab94580 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Wiedemann?= <jerome@wnetworks.org>
Date: Sun, 24 Jan 2021 20:44:57 +0000
Subject: [PATCH] feat: Add delta and median function

---
 src/graphEntry.ts      | 18 +++++++++++++++++-
 src/types-config-ti.ts |  2 +-
 src/types-config.ts    |  2 +-
 3 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/src/graphEntry.ts b/src/graphEntry.ts
index 197a4cb..7ea3df3 100644
--- a/src/graphEntry.ts
+++ b/src/graphEntry.ts
@@ -48,6 +48,8 @@ export default class GraphEntry {
       first: this._first,
       last: this._last,
       sum: this._sum,
+      median: this._median,
+      delta: this._delta,
     };
     this._index = index;
     this._cache = cache;
@@ -177,7 +179,7 @@ export default class GraphEntry {
     this._history = history;
     if (this._config.group_by.func !== 'raw') {
       this._computedHistory = this._dataBucketer().map((bucket) => {
-        return [(new Date(bucket.timestamp) as any) as number, this._func(bucket.data)];
+        return [(new Date(bucket.timestamp) as unknown) as number, this._func(bucket.data)];
       });
     }
     this._updating = false;
@@ -295,6 +297,20 @@ export default class GraphEntry {
     return items[0][1];
   }
 
+  private _median(items: EntityCachePoints) {
+    const itemsDup = this._filterNulls([...items]).sort((a, b) => a[1]! - b[1]!);
+    const mid = Math.floor((itemsDup.length - 1) / 2);
+    if (itemsDup.length % 2 === 1) return itemsDup[mid];
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+    return (itemsDup[mid][1]! + itemsDup[mid + 1][1]!) / 2;
+  }
+
+  private _delta(items: EntityCachePoints): number | null {
+    const max = this._maximum(items);
+    const min = this._minimum(items);
+    return max === null || min === null ? null : max - min;
+  }
+
   private _filterNulls(items: EntityCachePoints): EntityCachePoints {
     return items.filter((item) => item[1] !== null);
   }
diff --git a/src/types-config-ti.ts b/src/types-config-ti.ts
index 78c7712..71804ba 100644
--- a/src/types-config-ti.ts
+++ b/src/types-config-ti.ts
@@ -34,7 +34,7 @@ export const ChartCardSeriesExternalConfig = t.iface([], {
 
 export const GroupByFill = t.union(t.lit('null'), t.lit('last'), t.lit('zero'));
 
-export const GroupByFunc = t.union(t.lit('raw'), t.lit('avg'), t.lit('min'), t.lit('max'), t.lit('last'), t.lit('first'), t.lit('sum'));
+export const GroupByFunc = t.union(t.lit('raw'), t.lit('avg'), t.lit('min'), t.lit('max'), t.lit('last'), t.lit('first'), t.lit('sum'), t.lit('median'), t.lit('delta'));
 
 export const ChartCardHeaderExternalConfig = t.iface([], {
   "show": t.opt("boolean"),
diff --git a/src/types-config.ts b/src/types-config.ts
index 9d49137..d7ab108 100644
--- a/src/types-config.ts
+++ b/src/types-config.ts
@@ -29,7 +29,7 @@ export interface ChartCardSeriesExternalConfig {
 
 export type GroupByFill = 'null' | 'last' | 'zero';
 
-export type GroupByFunc = 'raw' | 'avg' | 'min' | 'max' | 'last' | 'first' | 'sum';
+export type GroupByFunc = 'raw' | 'avg' | 'min' | 'max' | 'last' | 'first' | 'sum' | 'median' | 'delta';
 
 export interface ChartCardHeaderExternalConfig {
   show?: boolean;