From 179c353f95724ba616e7b0c6f25ebc448cc24081 Mon Sep 17 00:00:00 2001
From: valentinkolb <valentin.kolb@uni-ulm.de>
Date: Wed, 13 Nov 2024 20:42:32 +0100
Subject: [PATCH] feat(analyticsApi): added initDailyAnalyticsAggregates
 endpoint

---
 analyticsApi/main.go | 85 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)

diff --git a/analyticsApi/main.go b/analyticsApi/main.go
index ea960a5..c42f357 100644
--- a/analyticsApi/main.go
+++ b/analyticsApi/main.go
@@ -308,6 +308,90 @@ func initAggregateCount(app *pocketbase.PocketBase, e *core.ServeEvent) {
 	}, apis.ActivityLogger(app))
 }
 
+// initDailyAnalyticsAggregates
+//
+// This endpoint aggregates daily analytics data for a specified date range from `startDate` to `now`.
+// It adds the following endpoint to the app:
+// GET /api/analytics/dailyAggregates
+//
+// The endpoint expects the following query parameter:
+//
+//		?startDate=ISO 8601 formatted date (optional)
+//
+//	  - `startDate`: An optional start date in ISO 8601 format (e.g., "2024-11-12T15:04:05Z").
+//	    If provided, aggregates are calculated from this date onward up to the current date.
+//	    If not provided, all data until today is included.
+//
+// Response format:
+//
+//	[
+//	  {
+//	    "date": "<ISO 8601>",
+//	    "error_count": <error count for that day>,
+//	    "page_view_count": <total page views for that day>,
+//	    "unique_visitor_count": <unique visitors for that day>
+//	  },
+//	  ...
+//	]
+func initDailyAnalyticsAggregates(app *pocketbase.PocketBase, e *core.ServeEvent) {
+	e.Router.GET("/api/analytics/dailyAggregates", func(c echo.Context) error {
+
+		// Check if user is in admin group
+		if err := ldapApi.UserIsInAdminGroup(app, c); err != nil {
+			return err
+		}
+
+		// Parse the start date
+		startDateParam := c.QueryParam("startDate")
+		var startDate time.Time
+		var err error
+		if startDateParam != "" {
+			startDate, err = time.Parse(time.RFC3339, startDateParam)
+			if err != nil {
+				return apis.NewBadRequestError("Invalid start date format, expected ISO 8601", err)
+			}
+		} else {
+			// Default to the beginning of time if not provided
+			startDate = time.Time{}
+		}
+
+		// Define the structure for the daily aggregate data
+		type DailyAggregate struct {
+			Date               string `db:"date" json:"date"`
+			ErrorCount         int    `db:"error_count" json:"error_count"`
+			PageViewCount      int    `db:"page_view_count" json:"page_view_count"`
+			UniqueVisitorCount int    `db:"unique_visitor_count" json:"unique_visitor_count"`
+		}
+
+		var results []DailyAggregate
+
+		// Query to aggregate daily data within the specified date range
+		err = app.Dao().DB().
+			NewQuery(`
+				SELECT 
+					created AS date,
+					COUNT(id) AS page_view_count,
+					SUM(CASE WHEN error IS NOT NULL THEN 1 ELSE 0 END) AS error_count,
+					COUNT(DISTINCT visitor) AS unique_visitor_count
+				FROM analyticsPageViewsWithSessionDetail
+				WHERE created >= {:startDate}
+				GROUP BY date
+				ORDER BY date ASC
+			`).
+			Bind(dbx.Params{
+				"startDate": startDate,
+			}).
+			All(&results)
+
+		if err != nil {
+			return apis.NewApiError(500, "Failed to query daily analytics aggregates", err)
+		}
+
+		// Return the final JSON response
+		return c.JSON(200, results)
+	}, apis.ActivityLogger(app))
+}
+
 // InitAnalyticsApi initializes analytics api endpoints
 func InitAnalyticsApi(app *pocketbase.PocketBase, e *core.ServeEvent) error {
 
@@ -315,6 +399,7 @@ func InitAnalyticsApi(app *pocketbase.PocketBase, e *core.ServeEvent) error {
 
 	initPageViewCount(app, e)
 	initAggregateCount(app, e)
+	initDailyAnalyticsAggregates(app, e)
 
 	return nil
 }