From 333443f271fb7457482f428b515d0bb64d33ddd6 Mon Sep 17 00:00:00 2001
From: valentinkolb <valentin.kolb@uni-ulm.de>
Date: Tue, 12 Nov 2024 23:48:21 +0100
Subject: [PATCH] feat(analyticsApi): added sessionCounts api

---
 analyticsApi/main.go | 93 ++++++++++++++++++++++++++++++++++++++++++++
 main/main.go         |  4 ++
 2 files changed, 97 insertions(+)
 create mode 100644 analyticsApi/main.go

diff --git a/analyticsApi/main.go b/analyticsApi/main.go
new file mode 100644
index 0000000..012bb62
--- /dev/null
+++ b/analyticsApi/main.go
@@ -0,0 +1,93 @@
+package analyticsApi
+
+import (
+	"git.stuve.uni-ulm.de/stuve-it/stuve-it-backend/ldapApi"
+	"git.stuve.uni-ulm.de/stuve-it/stuve-it-backend/logger"
+	"github.com/labstack/echo/v5"
+	"github.com/pocketbase/dbx"
+	"github.com/pocketbase/pocketbase"
+	"github.com/pocketbase/pocketbase/apis"
+	"github.com/pocketbase/pocketbase/core"
+	"time"
+)
+
+// initSessionCount
+//
+// this endpoint is used to aggregate session metadata counts
+// it adds the following endpoint to the app:
+// GET /api/analytics/sessionCounts
+//
+// the endpoint expects the following request data:
+//
+//	{
+//	  "startDate": "start date in ISO 8601 format",
+//	}
+func initSessionCount(app *pocketbase.PocketBase, e *core.ServeEvent) {
+	e.Router.GET("/api/analytics/sessionCounts", func(c echo.Context) error {
+
+		// Check if user is in admin group
+		if err := ldapApi.UserIsInAdminGroup(app, c); err != nil {
+			return err
+		}
+
+		// Get data from request
+		data := struct {
+			StartDate string `json:"startDate"`
+		}{}
+		if err := c.Bind(&data); err != nil {
+			return apis.NewBadRequestError("Failed to read request data", err)
+		}
+
+		// Parse the start date
+		startDate, err := time.Parse(time.RFC3339, data.StartDate)
+		if err != nil {
+			return apis.NewBadRequestError("Invalid start date format, expected ISO 8601", err)
+		}
+
+		type Data struct {
+			Value string `db:"value" json:"value"`
+			Count int    `db:"count" json:"count"`
+		}
+
+		// Use a map to store the response data
+		response := make(map[string][]Data)
+
+		fields := []string{"device_type", "browser_name", "operating_system", "user_agent", "geo_country_code", "preferred_language"}
+
+		for _, field := range fields {
+			data := []Data{}
+
+			err := app.Dao().DB().
+				NewQuery(`
+					SELECT ` + field + ` as value, COUNT(id) AS count
+					FROM analyticsPageViews
+					WHERE created >= {:startDate}
+					GROUP BY ` + field).
+				Bind(dbx.Params{
+					"startDate": startDate,
+				}).
+				All(&data)
+
+			if err != nil {
+				return apis.NewApiError(500, "Failed to aggregate data for "+field, err)
+			}
+
+			// Assign the data to the corresponding field in the map
+			response[field] = data
+		}
+
+		// Return the final JSON response
+		return c.JSON(200, response)
+	}, apis.ActivityLogger(app))
+
+}
+
+// InitAnalyticsApi initializes analytics api endpoints
+func InitAnalyticsApi(app *pocketbase.PocketBase, e *core.ServeEvent) error {
+
+	logger.LogInfoF("Initializing analytics api")
+
+	initSessionCount(app, e)
+
+	return nil
+}
diff --git a/main/main.go b/main/main.go
index 12a488c..4322ec4 100644
--- a/main/main.go
+++ b/main/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"git.stuve.uni-ulm.de/stuve-it/stuve-it-backend/analyticsApi"
 	"git.stuve.uni-ulm.de/stuve-it/stuve-it-backend/emailApi"
 	"git.stuve.uni-ulm.de/stuve-it/stuve-it-backend/eventEntriesNotifier"
 	"git.stuve.uni-ulm.de/stuve-it/stuve-it-backend/ldapApi"
@@ -30,6 +31,9 @@ func main() {
 	// setup ldap login
 	app.OnBeforeServe().Add(func(e *core.ServeEvent) error { return ldapApi.InitLdapApi(app, e) })
 
+	// setup analytics api
+	app.OnBeforeServe().Add(func(e *core.ServeEvent) error { return analyticsApi.InitAnalyticsApi(app, e) })
+
 	// setup qr api
 	app.OnBeforeServe().Add(func(e *core.ServeEvent) error { return qrApi.InitQRApi(app, e) })