From d2b2f934a030f0d4a97b25f5788ddd20c8a75eeb Mon Sep 17 00:00:00 2001
From: Natercio Moniz <natercio.moniz@gmail.com>
Date: Sun, 12 Jul 2026 07:56:52 +0100
Subject: [PATCH] initial file store

---
 internal/file_store.go | 29 +++++++++++++++++++++++++++++
 internal/report.go     |  4 +---
 2 files changed, 30 insertions(+), 3 deletions(-)
 create mode 100644 internal/file_store.go

diff --git a/internal/file_store.go b/internal/file_store.go
new file mode 100644
index 0000000..fe46870
--- /dev/null
+++ b/internal/file_store.go
@@ -0,0 +1,29 @@
+package internal
+
+import (
+	"fmt"
+	"os"
+)
+
+// FileStore loads and saves the state into a file
+type FileStore struct {
+	file *os.File
+}
+
+func NewFileStore(filename string) (*FileStore, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	return &FileStore{
+		file: f,
+	}, nil
+}
+
+func (fs *FileStore) Load() (map[string]*FillerQueue, error) {
+	return nil, fmt.Errorf("not implemented")
+}
+
+func (fs *FileStore) Save(map[string]*FillerQueue) error {
+	return fmt.Errorf("not implemented")
+}
diff --git a/internal/report.go b/internal/report.go
index b043c21..eb0e6b0 100644
--- a/internal/report.go
+++ b/internal/report.go
@@ -148,8 +148,6 @@ func BuildReport(ctx context.Context, reader RecordReader, writer ReportWriter,
 			}
 		}
 	}
-
-	return nil
 }
 
 // processRecord either adds buys to the queue or consumes buys from the queue when processing a
@@ -186,7 +184,7 @@ func processRecord(ctx context.Context, q *FillerQueue, rec Record, sel Selector
 				return ErrInsufficientBoughtVolume
 			}
 
-			// Since we don't apply selectors while processing buys we need to apply them here, befre we
+			// Since we don't apply selectors while processing buys we need to apply them here, before we
 			// actually use them.
 			if !sel(buy) {
 				continue