From 65e8a972e4f318d30d6363f7e5a1616e6bb2b557 Mon Sep 17 00:00:00 2001
From: Erik Winter <e@ewintr.nl>
Date: Wed, 16 Oct 2024 07:34:08 +0200
Subject: [PATCH] last update

---
 plan/storage/memory/sync.go      | 15 +++++++++++++++
 plan/storage/memory/sync_test.go | 16 +++++++++++++++-
 plan/storage/storage.go          |  2 ++
 3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/plan/storage/memory/sync.go b/plan/storage/memory/sync.go
index ca5fce0..42c6acb 100644
--- a/plan/storage/memory/sync.go
+++ b/plan/storage/memory/sync.go
@@ -3,6 +3,7 @@ package memory
 import (
 	"sort"
 	"sync"
+	"time"
 
 	"go-mod.ewintr.nl/planner/item"
 )
@@ -50,3 +51,17 @@ func (r *Sync) DeleteAll() error {
 
 	return nil
 }
+
+func (r *Sync) LastUpdate() (time.Time, error) {
+	r.mutex.RLock()
+	defer r.mutex.RUnlock()
+
+	var last time.Time
+	for _, i := range r.items {
+		if i.Updated.After(last) {
+			last = i.Updated
+		}
+	}
+
+	return last, nil
+}
diff --git a/plan/storage/memory/sync_test.go b/plan/storage/memory/sync_test.go
index 047b846..94a7a89 100644
--- a/plan/storage/memory/sync_test.go
+++ b/plan/storage/memory/sync_test.go
@@ -3,6 +3,7 @@ package memory_test
 import (
 	"fmt"
 	"testing"
+	"time"
 
 	"go-mod.ewintr.nl/planner/item"
 	"go-mod.ewintr.nl/planner/plan/storage/memory"
@@ -14,11 +15,15 @@ func TestSync(t *testing.T) {
 	mem := memory.NewSync()
 
 	t.Log("store")
+	now := time.Now()
+	ts := now
 	count := 3
 	for i := 0; i < count; i++ {
 		mem.Store(item.Item{
-			ID: fmt.Sprintf("id-%d", i),
+			ID:      fmt.Sprintf("id-%d", i),
+			Updated: ts,
 		})
+		ts = ts.Add(-1 * time.Minute)
 	}
 
 	t.Log("find all")
@@ -30,6 +35,15 @@ func TestSync(t *testing.T) {
 		t.Errorf("exp %v, got %v", count, len(actItems))
 	}
 
+	t.Log("last update")
+	actLU, actErr := mem.LastUpdate()
+	if actErr != nil {
+		t.Errorf("exp nil, got %v", actErr)
+	}
+	if !actLU.Equal(now) {
+		t.Errorf("exp %v, got %v", now, actLU)
+	}
+
 	t.Log("delete all")
 	if err := mem.DeleteAll(); err != nil {
 		t.Errorf("exp nil, got %v", err)
diff --git a/plan/storage/storage.go b/plan/storage/storage.go
index cdb9907..9dc2794 100644
--- a/plan/storage/storage.go
+++ b/plan/storage/storage.go
@@ -3,6 +3,7 @@ package storage
 import (
 	"errors"
 	"sort"
+	"time"
 
 	"go-mod.ewintr.nl/planner/item"
 )
@@ -23,6 +24,7 @@ type Sync interface {
 	FindAll() ([]item.Item, error)
 	Store(i item.Item) error
 	DeleteAll() error
+	LastUpdate() (time.Time, error)
 }
 
 type Event interface {